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Ferroptosis is a regulated form of cell death which is considered an oxidative iron-dependent process. The lipid hydroperoxidase glutathione peroxidase 4 prevents the iron (Fe2+)-dependent formation of toxic lipid reactive oxygen species. While emerging evidence indicates that inhibition of glutathione peroxidase 4 as a hallmark of ferroptosis in many cancer cell lines, the involvement of this biochemical pathway in neuronal death remains largely unclear. Here, we investigate, first whether the ferroptosis key players are involved in the neuronal cell death induced by erastin. The second objective was to examine whether there is a cross talk between ferroptosis and autophagy. The third main was to address neuron response to erastin, with a special focus on ferritin and nuclear receptor coactivator 4-mediated ferritinophagy. To test this in neurons, erastin (0.5–8 µM) was applied to hippocampal HT22 neurons for 16 hours. In addition, cells were cultured with the autophagy inhibitor, 3-methyladenin (10 mM) and/or ferroptosis inhibitors, ferrostatin 1 (10–20 µM) or deferoxamine (10–200 µM) before exposure to erastin. In this study, we demonstrated by immunofluorescence and western blot analysis, that erastin downregulates dramatically the expression of glutathione peroxidase 4, the sodium-independent cystine-glutamate antiporter and nuclear receptor coactivator 4. The protein levels of ferritin and mitochondrial ferritin in HT22 hippocampal neurons did not remarkably change following erastin treatment. In addition, we demonstrated that not only the ferroptosis inhibitor, ferrostatin1/deferoxamine abrogated the ferroptotic cell death induced by erastin in hippocampal HT22 neurons, but also the potent autophagy inhibitor, 3-methyladenin. We conclude that (1) erastin-induced ferroptosis in hippocampal HT22 neurons, despite reduced nuclear receptor coactivator 4 levels, (2) that either nuclear receptor coactivator 4-mediated ferritinophagy does not occur or is of secondary importance in this model, (3) that ferroptosis seems to share some features of the autophagic cell death process.
In the basal, proliferative layer of healthy skin, the mTOR complex 1 (mTORC1) is activated, thus regulating proliferation while preventing differentiation. When cells leave the proliferative, basal compartment, mTORC1 signaling is turned off, which allows differentiation. Under inflammatory conditions, this switch is hijacked by cytokines and prevents proper differentiation. It is currently unknown how mTORC1 is regulated to mediate these effects on keratinocyte differentiation. In other tissues, mTORC1 activity is controlled through various pathways via the tuberous sclerosis complex (TSC). Thus, we investigated whether the TS complex is regulated by proinflammatory cytokines and contributes to the pathogenesis of psoriasis. TNF-α as well as IL-1β induced the phosphorylation of TSC2, especially on S939 via the PI3-K/AKT and MAPK pathway. Surprisingly, increased TSC2 phosphorylation could not be detected in psoriasis patients. Instead, TSC2 was strongly downregulated in lesional psoriatic skin compared to non-lesional skin of the same patients or healthy skin. In vitro inflammatory cytokines induced dissociation of TSC2 from the lysosome, followed by destabilization of the TS complex and degradation. Thus, we assume that in psoriasis, inflammatory cytokines induce strong TSC2 phosphorylation, which in turn leads to its degradation. Consequently, chronic mTORC1 activity impairs ordered keratinocyte differentiation and contributes to the phenotypical changes seen in the psoriatic epidermis.
The culture of primary intestinal epithelia cells is not possible in a normal culture system. In 2009 a three-dimensional culture system of intestinal stem cells was established that shows many of the physiological features of the small intestine, such as crypt-villus structure, stem cell niche and all types of differentiated intestinal epithelial cells. These enteroids can be used to analyze biology of intestinal stem cells, gut homeostasis and the development of diseases. They also give the possibility to reduce animal numbers, as enteroids can be cryo-conserved and cultivated for many passages. To investigate the influence of genes such as NADPH oxidases on the gut homeostasis, transgenic approached are the method of choice. The generation of enteroids from knockout mice allows real-time observations of knockout effects. Often conditional knockout or overexpression strategies using inducible Cre recombinase are applied to avoid effects of adaption to the knockout. However, the Cre recombinase has many known caveats from unspecific binding and its endonuclease activity. In this study, we show that although NADPH oxidases are important for in vivo differentiation and proliferation of the intestine, their expression is drastically reduced in the organoid system. Activation of Cre recombinase by 4-hydroxy tamoxifen in freshly isolated enteroids, independently of floxed genes, leads to decreased diameter of organoids. This effect is concentration-dependent and is caused by reduced cell proliferation and induction of apoptosis and DNA damage. In contrast, constitutive expression of Cre has no impact on the enteroids. Therefore, reduction of tamoxifen concentration and treatment duration should be carefully titrated, and appropriate controls are necessary.
Purpose
To assess the diagnostic value of different imaging modalities in distinguishing systemic vasculitis from other internal and immunological diseases.
Methods
This retrospective study included 134 patients with suspected vasculitis who underwent ultrasound, magnetic resonance imaging (MRI), or 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) between 01/2010 and 01/2019, finally consisting of 70 individuals with vasculitis. The main study parameter was the confirmation of the diagnosis using one of the three different imaging modalities, with the adjudicated clinical and histopathological diagnosis as the gold standard. A secondary parameter was the morphological appearance of the vessel affected by vasculitis.
Results
Patients with systemic vasculitis had myriad clinical manifestations with joint pain as the most common symptom. We found significant correlations between different imaging findings suggestive of vasculitis and the final adjudicated clinical diagnosis. In this context, on MRI, vessel wall thickening, edema, and diameter differed significantly between vasculitis and non-vasculitis groups (p < 0.05). Ultrasound revealed different findings that may serve as red flags in identifying patients with vasculitis, such as vascular occlusion or halo sign (p = 0.02 vs. non-vasculitis group). Interestingly, comparing maximal standardized uptake values from PET/CT examinations with vessel wall thickening or vessel diameter did not result in significant differences (p > 0.05).
Conclusions
We observed significant correlations between different imaging findings suggestive of vasculitis on ultrasound or MRI and the final adjudicated diagnosis. While ultrasound and MRI were considered suitable imaging methods for detecting and discriminating typical vascular changes, 18F-FDG PET/CT requires careful timing and patient selection given its moderate diagnostic accuracy.
Purpose:
The purpose of the study was to provide a consensus definition of the infrarenal sealing zone and develop an algorithm to determine when and if adjunctive procedure(s) or reintervention should be considered in managing patients undergoing endovascular aortic repair (EVAR) for infrarenal abdominal aortic aneurysm (AAA).
Methods:
A European Advisory Board (AB), made up of 11 vascular surgeons with expertise in EVAR for AAA, was assembled to share their opinion regarding the definition of preoperative and postoperative infrarenal sealing zone. Information on their current clinical practice and level of agreement on proposed reintervention paths was used to develop an algorithm. The process included 2 virtual meetings and 2 rounds of online surveys completed by the AB (Delphi method). Consensus was defined as reached when ≥ 8 of 11 (73%) respondents agreed or were neutral.
Results:
The AB reached complete consensus on definitions and measurement of the pre-EVAR target anticipated sealing zone (TASZ) and the post-EVAR real achieved sealing zone (RASZ), namely, the shortest length between the proximal and distal reference points as defined by the AB, in case of patients with challenging anatomies. Also, agreement was achieved on a list of 4 anatomic parameters and 3 prosthesis-/procedure-related parameters, considered to have the most significant impact on preoperative and postoperative sealing zones. Furthermore, the agreement was reached that in the presence of visible neck-related complications, both adjunctive procedure(s) and reintervention should be contemplated (100% consensus). In addition, adjunctive procedure(s) or reintervention can be considered in the following cases (% consensus): insufficient sealing zone on completion imaging (91%) or on the first postoperative computed tomography (CT) scan (91%), suboptimal sealing zone on completion imaging (73%) or postoperative CT scan (82%), and negative evolution of the actual sealing zone over time (91%), even in the absence of visible complications.
Conclusions:
AB members agreed on definitions of the pre- and post-EVAR infrarenal sealing zone, as well as factors of influence. Furthermore, a clinical decision algorithm was proposed to determine the timing and necessity of adjunctive procedure(s) and reinterventions.
Background
Musclin is an activity‐stimulated and cardioprotective myokine that attenuates pathological cardiac remodeling. Musclin deficiency, in turn, results in reduced physical endurance. The aim of this study was to assess the prognostic value of circulating musclin as a novel, putative biomarker to identify patients undergoing transcatheter aortic valve implantation (TAVI) who are at a higher risk of death.
Methods and Results
In this study, we measured systemic musclin levels in 368 patients undergoing TAVI who were at low to intermediate clinical risk (median EuroSCORE [European System for Cardiac Operative Risk Evaluation] II: 3.5; quartile 1–quartile, 2.2%–5.3%), whereby 209 (56.8%) patients were at low and 159 (43.2%) were at intermediate risk. Median preprocedural musclin levels were 2.7 ng/mL (quartile 1–quartile 3, 1.5–4.6 ng/mL). Musclin levels were dichotomized in low (<2.862 ng/mL, n=199 [54.1%]) or high (≥ 2.862 ng/mL, n=169 [45.9%]) groups using cutoff values determined by classification and regression tree analysis. The primary end point was 1‐year overall survival. Patients with low circulating musclin levels exhibited a significantly higher prevalence of frailty, low albumin values, hypertension, and history of stroke as well as higher N‐terminal pro‐B‐type natriuretic peptide. Low musclin levels significantly predicted risk of death in univariable (hazard ratio, 1.81; 95% CI, 1.00–3.53 [P=0.049]) and multivariable (adjusted hazard ratio, 2.45; 95% CI, 1.06–5.69 [P=0.037]) Cox regression analyses. Additionally, low musclin levels in combination with conventional EuroSCORE II suggested improved risk stratification in patients undergoing TAVI who were at low to intermediate clinical risk into subgroups with reduced 1‐year survival rates by log‐rank test (P for trend=0.003).
Conclusions
Circulating musclin is an independent predictor of 1‐year overall survival in patients undergoing TAVI. Combined with EuroSCORE II, circulating musclin might help to improve prediction of mortality in patients undergoing TAVI who are at low to intermediate clinical risk.
Infection with the SARS (Severe Acute Respiratory Syndrome)-associated coronavirus results in respiratory failure probably by immunological mechanisms in 10% of patients. Laboratory markers that predict subsequent respiratory failure would therefore be useful in patient management.
We describe the clinical course, hematologic parameters, lymphocyte subpopulations and markers of inflammation in two patients with SARS, i.e., one man with diabetes mellitus and one pregnant woman, infected by the same viral isolate.
The patient with underlying diabetes mellitus developed respiratory failure after admission in the second week of the illness while the second patient developed only a mild disease without respiratory failure. Subsequent respiratory dysfunction was associated with lown umbers of Natural Killer (NK) cells at presentation and elevated CRP levels during the illness.
NK cells and CRP levels at the end of the first week of the disease might be related to subsequent respiratory dysfunction and may link underlying conditions to disease severity.
The transcription factor hypoxia-inducible factor 1 (HIF1) is an important driver of cancer and is therefore an attractive drug target. Acriflavine (ACF) has been suggested to inhibit HIF1, but its mechanism of action is unknown. Here we investigated the interaction of ACF with DNA and long non-coding RNAs (lncRNAs) and its function in human endothelial cells. ACF promoted apoptosis and reduced proliferation, network formation, and angiogenic capacity. It also induced changes in gene expression, as determined by RNA sequencing (RNA-seq), which could not be attributed to specific inhibition of HIF1. A similar response was observed in murine lung endothelial cells. Although ACF increased and decreased a similar number of protein-coding genes, lncRNAs were preferentially upregulated under normoxic and hypoxic conditions. An assay for transposase accessibility with subsequent DNA sequencing (ATAC-seq) demonstrated that ACF induced strong changes in chromatin accessibility at lncRNA promoters. Immunofluorescence showed displacement of DNA:RNA hybrids. Such effects might be due to ACF-mediated topoisomerase inhibition, which was indeed the case, as reflected by DNA unwinding assays. Comparison with other acridine derivatives and topoisomerase inhibitors suggested that the specific function of ACF is an effect of acridinium-class compounds. This study demonstrates that ACF inhibits topoisomerases rather than HIF specifically and that it elicits a unique expression response of lncRNAs.
Objectives
To identify the main problem areas in the applicability of the current TNM staging system (8th ed.) for the radiological staging and reporting of rectal cancer and provide practice recommendations on how to handle them.
Methods
A global case-based online survey was conducted including 41 image-based rectal cancer cases focusing on various items included in the TNM system. Cases reaching < 80% agreement among survey respondents were identified as problem areas and discussed among an international expert panel, including 5 radiologists, 6 colorectal surgeons, 4 radiation oncologists, and 3 pathologists.
Results
Three hundred twenty-one respondents (from 32 countries) completed the survey. Sixteen problem areas were identified, related to cT staging in low-rectal cancers, definitions for cT4b and cM1a disease, definitions for mesorectal fascia (MRF) involvement, evaluation of lymph nodes versus tumor deposits, and staging of lateral lymph nodes. The expert panel recommended strategies on how to handle these, including advice on cT-stage categorization in case of involvement of different layers of the anal canal, specifications on which structures to include in the definition of cT4b disease, how to define MRF involvement by the primary tumor and other tumor-bearing structures, how to differentiate and report lymph nodes and tumor deposits on MRI, and how to anatomically localize and stage lateral lymph nodes.
Conclusions
The recommendations derived from this global survey and expert panel discussion may serve as a practice guide and support tool for radiologists (and other clinicians) involved in the staging of rectal cancer and may contribute to improved consistency in radiological staging and reporting.
While in large clinical laboratories the implementation of total laboratory automation is continuously proceeding, this concept is mostly not suitable for small- and middle-sized laboratories or for testing laboratories of blood donation services due to costs and required space. For these facilities, however, a rational level of automation can be achieved by the installation of stand-alone work cells for pre-analytical and selected analytical processes. In this review, the features of some automated pre-analytical sample processing systems and automated systems for the serological testing for infectious diseases are described exemplarily and compared with each other. The major advantages of automated systems, compared to a solely manual workflow, are described. Essential factors which have to be considered for making the choice for an appropriate automated system are pointed out.
Purpose:
Discordance between pre-operative biopsy and final pathology for Upper Tract Urothelial Carcinoma (UTUC) is high and optimal management remains controversial. The aim of this study is to evaluate the accuracy of pre-operative biopsy, to identify prognostic factors and to evaluate the effect of adjuvant chemotherapy on survival and oncologic outcome in UTUC.
Methods:
We analyzed records of patients receiving surgical treatment for UTUC. Pathology of pre-operative biopsy was compared to surgical specimen. We used Kaplan-Meier method to estimate survival probabilities and Cox's proportional hazards models to estimate the association between covariates and event times. Primary endpoint was overall survival (OS). A matched-pair analysis was performed to evaluate the effect of adjuvant chemotherapy.
Results:
151 patients underwent surgical treatment (28% open, 36% laparoscopic, 17% robotic radical nephroureterectomy; 14% segmental ureteral resections and 5% palliative nephrectomy) for UTUC and were included in the analysis. Upstaging from <pT1 in endoscopic biopsy to ≥pT1 in final pathology occurred in 61% of patients and upgrading from low-grade to high-grade occurred in 30% of patients. Five-year OS was 59.5%. In the univariate Cox-regression model pathological stage, grade, lymphovascular invasion and positive surgical margins were associated with OS. Matched pair analysis for stage (<pT3; ≥pT3; pN+) and age revealed a significant survival benefit for adjuvant chemotherapy (HR 0.40, 0.14–0.77, p < 0.018) in this cohort.
Conclusion:
UTUC is often underestimated in pre-operative biopsy, and it is associated with significant mortality. Pathological stage and grade, lymphovascular invasion and lymph node metastases are predictors of oncologic outcome and survival.
Congenital diaphragmatic hernia (CDH) is a relatively common and life-threatening birth defect, characterized by an abnormal opening in the primordial diaphragm that interferes with normal lung development. As a result, CDH is accompanied by immature and hypoplastic lungs, being the leading cause of morbidity and mortality in patients with this condition. In recent decades, various animal models have contributed novel insights into the pathogenic mechanisms underlying CDH and associated pulmonary hypoplasia. In particular, the generation of genetically modified mouse models, which show both diaphragm and lung abnormalities, has resulted in the discovery of multiple genes and signaling pathways involved in the pathogenesis of CDH. This article aims to offer an up-to-date overview on CDH-implicated transcription factors, molecules regulating cell migration and signal transduction as well as components contributing to the formation of extracellular matrix, whilst also discussing the significance of these genetic models for studying altered lung development with regard to the human situation.
Background
Photochemical internalization (PCI) is a novel technology for light-induced enhancement of the local therapeutic effect of cancer drugs, utilizing a specially designed photosensitizing molecule (fimaporfin). The photosensitizing molecules are trapped in endosomes along with macromolecules or drugs. Photoactivation of fimaporfin disrupts the endosomal membranes so that drug molecules are released from endosomes inside cells and can reach their therapeutic target in the cell cytosol or nucleus. Compared with photodynamic therapy, the main cytotoxic effect with PCI is disruption of the endosomal membrane resulting in delivery of chemotherapy drug, and not to the photochemical reactions per se. In this study we investigated the effect of PCI with gemcitabine in patients with inoperable perihilar cholangiocarcinoma (CCA).
Methods
The in vitro cytotoxic effect of PCI with gemcitabine was studied on two CCA-derived cell lines. In a fimaporfin dose-escalation phase I clinical study, we administered PCI with gemcitabine in patients with perihilar CCA (n = 16) to establish a safe and tolerable fimaporfin dose and to get early signals of efficacy. The patients enrolled in the study had tumors in which the whole length of the tumor could be illuminated from the inside of the bile duct, using an optical fiber inserted via an endoscope (Fig. 1). Fimaporfin was administered intravenously at day 0; gemcitabine (i.v.) and intraluminal biliary endoscopic laser light application on day 4; followed by standard gemcitabine/cisplatin chemotherapy.
Results
Preclinical experiments showed that PCI enhanced the effect of gemcitabine. In patients with CCA, PCI with gemcitabine was well tolerated with no dose-limiting toxicities, and no unexpected safety signals. Disease control was achieved in 10 of 11 evaluable patients, with a clearly superior effect in the two highest dose groups. The objective response rate (ORR) was 42%, including two complete responses, while ORR at the highest dose was 60%. Progression-free survival at 6 months was 75%, and median overall survival (mOS) was 15.4 months, with 22.8 months at the highest fimaporfin dose.
Conclusion
Photochemical internalization with gemcitabine was found to be safe and resulted in encouraging response and survival rates in patients with unresectable perihilar CCA.
Microstates sind kurzzeitig andauernde, wiederkehrende elektrische Potentialfelder über dem Kortex. Ein Großteil der Signalvarianz des
Elektroenzephalogramms (EEG) wird durch vier repräsentative räumliche Potentialverteilungen (Topographien) abgedeckt, welche bereits im Wachzustand und im Schlaf identifiziert wurden und kanonisch als Karten A-D bezeichnet werden. Microstates wurden in den vergangenen Jahren vor allem im Ruhe-Wach-EEG untersucht, über andere Vigilanzzustände hingegen wissen wir bisher wenig. Klassischerweise analysieren wir verschiedene Vigilanzzustände im Elektroenzephalogramm anhand von Frequenzen und Graphoelementen, die Microstate-Analyse hingegen betrachtet in erster Linie die räumliche Verteilung des kortikalen Potentials zu einem jeweiligen Zeitpunkt.
Die vorliegende Studie hatte zum Ziel, die zeitliche Abfolge von Microstates im Wachzustand und im Schlaf zu charakterisieren. Mittels informationstheoretischer Ansätze können die dynamischen Eigenschaften der Microstate-Sequenz direkt mit den frequenzbasierten Eigenschaften des zugrundeliegenden EEG verglichen werden. Es wurden die Ruhe-Wach- und Schlafdaten von 32 gesunden Probanden analysiert. Hierbei fand sich eine Zunahme der mittleren Microstate-Dauer und der Relaxationszeit der Übergangsmatrix, was langsamere Dynamiken im Schlaf anzeigt. Erstaunlicherweise konnte im Tiefschlaf mehr als die Hälfte der Sequenzen nicht von einem simplen Markov-Modell unterschieden werden, was für eine Abnahme der Komplexität der Microstate-Sequenzen spricht. Die Entropierate der untersuchten Sequenzen nahm mit zunehmender Schlaftiefe ab, was weniger
Zufall bzw. eine größere Vorhersagbarkeit innerhalb der Sequenzen bedeutet.
Darüberhinaus konnte gezeigt werden, dass Microstates immer dann periodisch auftreten, wenn das zugrundeliegende EEG eine dominante Grundfrequenz aufweist, sodass oszillatorische Hirnaktivität auch auf der Microstate-Ebene verfolgbar ist. Hierdurch ist es möglich, physiologische Vigilanzzustände quantitativ voneinander zu unterscheiden.
Interpretiert man Microstates als Korrelate neuronaler Netzwerke, scheinen im Schlaf dieselben oder ähnliche Netzwerke aktiviert zu werden wie im Wachzustand, allerdings mit zunehmender Schlaftiefe langsamer und auf eine weniger komplexe Art und Weise.
Wissenschaftsbasierte und verständliche Gesundheitsinformationen sind ein Kernelement der Evidenzbasierten Medizin und von Public Health. Ziel ist es, informierte Entscheidungen zu ermöglichen, die auf realistischen Einschätzungen von Gesundheitsrisiken sowie von Nutzen und Schaden möglicher Interventionen beruhen. In Deutschland wurden während der COVID-19-Pandemie die Standards für eine evidenzbasierte Risikokommunikation wenig beachtet. Häufig war die öffentliche Berichterstattung einseitig, unvollständig und missverständlich. Bedrohungsszenarien haben emotionalen Stress und unnötige Angst ausgelöst. Eine systematische und umfassende Aufarbeitung der Pandemiemaßnahmen ist auch in Deutschland dringlich geboten. Dabei müsste eine kritisch-konstruktive Analyse der medialen Risikokommunikation von Expert*innen, Politiker*innen und Medien ein zentrales Element der Aufarbeitung sein. Die Ergebnisse sollen helfen, aus der vergangenen Pandemie zu lernen, um für künftige Krisen besser vorbereitet zu sein.
The long-term effect of protection by two doses of SARS-CoV-2 vaccination in patients receiving chronic intermittent hemodialysis (CIHD) is an urging question. We investigated the humoral and cellular immune response of 42 CIHD patients who had received two doses of SARS-CoV-2 vaccine, and again after a booster vaccine with mRNA-1273 six months later. We measured antibody levels and SARS-CoV-2-specific surrogate neutralizing antibodies (SNA). Functional T cell immune response to vaccination was assessed by quantifying interferon-γ (IFN-γ) and IL-2 secreting T cells specific for SARS-CoV-2 using an ELISpot assay. Our data reveal a moderate immune response after the second dose of vaccination, with significantly decreasing SARS-CoV-2-specific antibody levels and less than half of the study group showed neutralizing antibodies six months afterwards. Booster vaccines increased the humoral response dramatically and led to a response rate of 89.2% for antibody levels and a response rate of 94.6% for SNA. Measurement in a no response/low response (NR/LR) subgroup of our cohort, which differed from the whole group in age and rate of immunosuppressive drugs, indicated failure of a corresponding T cell response after the booster vaccine. We strongly argue in favor of a regular testing of surrogate neutralizing antibodies and consecutive booster vaccinations for CIHD patients to provide a stronger and persistent immunity.
Abstract
The co-occurrence of insulin resistance (IR)-related metabolic conditions with neuropsychiatric disorders is a complex public health challenge. Evidence of the genetic links between these phenotypes is emerging, but little is currently known about the genomic regions and biological functions that are involved. To address this, we performed Local Analysis of [co]Variant Association (LAVA) using large-scale (N=9,725-933,970) genome-wide association studies (GWASs) results for three IR-related conditions (type 2 diabetes mellitus, obesity, and metabolic syndrome) and nine neuropsychiatric disorders. Subsequently, positional and expression quantitative trait locus (eQTL)-based gene mapping and downstream functional genomic analyses were performed on the significant loci. Patterns of negative and positive local genetic correlations (|rg|=0.21-1, pFDR<0.05) were identified at 109 unique genomic regions across all phenotype pairs. Local correlations emerged even in the absence of global genetic correlations between IR-related conditions and Alzheimer’s disease, bipolar disorder, and Tourette’s syndrome. Genes mapped to the correlated regions showed enrichment in biological pathways integral to immune-inflammatory function, vesicle trafficking, insulin signalling, oxygen transport, and lipid metabolism. Colocalisation analyses further prioritised 10 genetically correlated regions for likely harbouring shared causal variants, displaying high deleterious or regulatory potential. These variants were found within or in close proximity to genes, such as SLC39A8 and HLA-DRB1, that can be targeted by supplements and already known drugs, including omega-3/6 fatty acids, immunomodulatory, antihypertensive, and cholesterol-lowering drugs. Overall, our findings underscore the complex genetic landscape of IR-neuropsychiatric multimorbidity, advocating for an integrated disease model and offering novel insights for research and treatment strategies in this domain.
Highlights
Local genetic correlations found even in the absence of global correlations.
Both positive and negative local correlations found for IR-neuropsychiatric pairs.
Enrichment for immune, and insulin signalling pathways, among others.
Pinpointed shared likely causal variants within 10 genomic regions.
Identified therapeutic targets, e.g., SLC39A8 and HLA-DRB1, for drug repurposing.
Die Nukleinsäure-Amplifikations Testung (NAT) von Blutprodukten wurde Mitte der 90er Jahre von europäischen Plasma verarbeitenden Firmen und großen deutschen Blutspendediensten entwickelt. Primäres Ziel war eine verbesserte Sicherheit von Blutprodukten, indem das so genannte diagnostische Fenster nach einer Virusinfektion bis zum ersten Nachweis von Antikörpern so weit wie möglich geschlossen werden sollte. Bei einer qualitätsgerechten PCR kommen bereits der Probenentnahme, dem Probentransport sowie der Probenlagerung große Bedeutung zu, da vermieden werden muß, daß es durch ungeeignete Antikoagulanzien oder Entnahmetechniken zu einem Sensitivitätsverlust kommt oder daß Kontaminationen falsch positive Ergebnisse hervorrufen. Wird ein Pooling von Proben durchgeführt, ergibt sich ein Verdünnungsfaktor, weshalb darauf zu achten ist, dass gegebenenfalls nachfolgende Anreicherungsschritte für Viren, wie z.B. eine Zentrifugation, implementiert werden. Der Gesamtprozeß von Pooling und Virusanreicherung ist ebenso wie die Probenvorbereitung durch geeignete Maßnahmen zu validieren und durch Qualitätssicherungsmaßnahmen zu flankieren. Die in der Extraktion der viralen Nukleinsäuren verwendeten Reagenzien sollten im Laboralltag möglichst einfach zu handhaben sein, keine Gefährdung des Laborpersonals darstellen und die Virus-Nukleinsäure gleichzeitig mit höchster Effizienz freisetzen und in sehr hoher Reinheit für die anschließende Amplifikation bereitstellen. Qualitätssicherungmaßnahmen sollen hier sowohl die geforderte Effizienz des Prozesses sichern als auch verhindern, daß es in dieser kritischen Phase zu Kontaminationen kommt. Zur Amplifikation stehen verschiedene Methoden zur Verfügung, wobei die PCR, insbesondere bei inhouse-Systemen, die weiteste Verbreitung gefunden hat. Der Prozeß der Amplifikation sollte möglichst im geschlossenen System erfolgen, wie dies z.B. in Real-time PCR-Systemen die Regel ist, ohne daß das Reaktionsgefäß während oder nach dem Amplifikationsprozeß geöffnet werden muß. Dies gewährleistet eine hohe Sicherheit vor Kontaminationen durch freigesetzte Amplifikate. Im Blutspendewesen ist es von höchster Bedeutung, daß negative Ergebnisse tatsächlich negative Blutspenden anzeigen. Interne Kontrollen, die eine korrekte Funktionsweise jeder individuellen PCR signalisieren, sollten deshalb in jeder Reaktion mitgeführt werden. Neben internen Kontrollen sind externe Negativ- und Positiv-Kontrollen mitzuführen, um falsch positive Reaktionen nachzuweisen bzw. auch die vor der PCR liegenden Prozesse wie Virusanreicherung und Extraktion zu überwachen. Alle Prozesse sind nach den von den Behörden festgelegten Kriterien durchgängig zu validieren, und es ist routinemäßig an externen Qualitätskontrollmaßnahmen (Ringversuchen) teilzunehmen.
Background: For rheumatoid arthritis (RA), the treat-to-target concept suggests attaining remission or at least low disease activity (LDA) after 12 weeks.
Objectives: This German, prospective, multicenter, non-interventional study aimed to determine the proportion of patients with RA who achieved their treat-to-target aim after 12 and 24 weeks of etanercept (ETN) treatment in a real-life setting, as opposed to patients achieving their therapeutic target at a later timepoint (week 36 or 52).
Methods: A total of 824 adults with a confirmed diagnosis of RA without prior ETN treatment were included. Remission and LDA were defined as DAS28 < 2.6 and DAS28 ≤ 3.2, respectively.
Results: The proportion of patients achieving remission was 24% at week 12 and 31% at week 24. The proportion of patients achieving LDA was 39% at week 12 and 45% at week 24. The proportion of patients achieving remission or LDA further increased beyond week 24 up to week 52. Improvement in pain and reduction in concomitant glucocorticoid treatment were observed. Improvements in patient-reported outcomes were also seen in patients who did not reach remission or LDA. No new safety signals were detected.
Conclusions: A considerable proportion of patients with RA attained the target of remission or LDA after 12 weeks of ETN treatment. Even beyond that timepoint, the proportion of patients achieving treatment targets continued to increase up to week 52.
Trial Registration
ClinicalTrials.gov Identifier: NCT02486302.
Plain Language Summary
Physicians measure response to treatment of rheumatoid arthritis using a disease activity score (DAS28). People with a DAS28 of less than 2.6 have very few to no symptoms (also called remission). People with a DAS28 of 3.2 or less, called low disease activity, may experience mild symptoms. When people do not respond to treatment after 12 weeks, it is usually recommended to prescribe a different treatment. Researchers do not know how many people who do not respond after 12 weeks would respond if treatment were continued. A total of 824 German people with rheumatoid arthritis who received a drug called etanercept for up to 52 weeks took part in this study. Researchers wanted to know how many people had remission or low disease activity after 12 weeks and 24 weeks of treatment.
After 12 weeks, 24 in 100 people had remission; this increased to 31 in 100 people after 24 weeks. Thirty-nine in 100 people had low disease activity after 12 weeks; this increased to 45 in 100 people after 24 weeks. The number of people with remission or low disease activity increased with longer treatment (up to 52 weeks). People needed less additional treatment with a type of drug called glucocorticoids. The people in this study experienced side effects that were similar to those reported by people who took etanercept in previous studies.
The researchers concluded that a considerable proportion of people responded to treatment with etanercept after 12 weeks. This proportion increased when treatment was continued for longer than 12 weeks.
Porous tantalum trabecular metal biomaterial has a similar structure to trabecular bone, and was recently added to titanium dental implants as a surface enhancement. The purpose of this prospective pilot study was to describe 5-year survival results and crestal bone level changes around immediately-provisionalized Trabecular Metal Dental Implants. Eligible patients were adults in need of ≥1 implants in the posterior jaw. A non-occluding single acrylic provisional crown was in place for up to 14 days before final restoration. Clinical evaluations with radiographs were conducted at each follow-up visit (1 month, 3 months, 6 months, and 1 to 5 years). The primary endpoint was implant survival, characterized using the Kaplan-Meier method. The secondary endpoint was changes in crestal bone level, evaluated using a paired t-test to compare mean crestal bone levels between the baseline, 6-month, and annual follow-up values. In total, 30 patients (37 implants) were treated. Mean patient age was 45.5 years, and 63% were female. There was one implant failure; cumulative survival at 5 years was 97.2%. After the initial bone loss of 0.40 mm in the first 6 months, there were no statistically significant changes in crestal bone level over time up to 5 years of follow-up.
Objective: Liver stiffness measurement (LSM) is a tool used to screen for significant fibrosis and portal hypertension. The aim of this retrospective multicentre study was to develop an easy tool using LSM for clinical outcomes in advanced chronic liver disease (ACLD) patients.
Design: This international multicentre cohort study included a derivation ACLD patient cohort with valid two-dimensional shear wave elastography (2D-SWE) results. Clinical and laboratory parameters at baseline and during follow-up were recorded. LSM by transient elastography (TE) was also recorded if available. The primary outcome was overall mortality. The secondary outcome was the development of first/further decompensation.
Results: After screening 2148 patients (16 centres), 1827 patients (55 years, 62.4% men) were included in the 2D-SWE cohort, with median liver SWE (L-SWE) 11.8 kPa and a model for end stage liver disease (MELD) score of 8. Combination of MELD score and L-SWE predict independently of mortality (AUC 0.8). L-SWE cut-off at ≥20 kPa combined with MELD ≥10 could stratify the risk of mortality and first/further decompensation in ACLD patients. The 2-year mortality and decompensation rates were 36.9% and 61.8%, respectively, in the 305 (18.3%) high-risk patients (with L-SWE ≥20 kPa and MELD ≥10), while in the 944 (56.6%) low-risk patients, these were 1.1% and 3.5%, respectively. Importantly, this M10LS20 algorithm was validated by TE-based LSM and in an additional cohort of 119 patients with valid point shear SWE-LSM.
Conclusion: The M10LS20 algorithm allows risk stratification of patients with ACLD. Patients with L-SWE ≥20 kPa and MELD ≥10 should be followed closely and receive intensified care, while patients with low risk may be managed at longer intervals.
Rationale: Studies have suggested mental health improvements following the use of the psychotropic plant concoction ayahuasca in non-clinical and clinical samples.
Objectives: The present observational study assessed depressive symptomatology in 20 clinically depressed patients (symptom score > 13 on the Beck’s Depression Inventory) before attendance of an ayahuasca ceremony and 1 month and 1 year after. Secondary measures included ratings of altered states of consciousness and ego dissolution during the ayahuasca ceremony as well as global measures of mindfulness, satisfaction with life, depression, anxiety, and stress.
Results: Twenty participants completed baseline and 1-day follow-up, 19 completed measures at 1-month follow-up, and 17 completed measures at 1-year follow-up. BDI scores reduced from baseline (M = 22.7) to all post-ceremony measures (Ms 11.45, 12.89, and 8.88, for 1-day, 1-month, and 1-year follow-up, respectively). After 1 day, 12/20 participants were in remission (BDI < 13). Remission rates after 1 month and 1 year were 13/19 and 12/17, respectively. Three participants remained mildly depressed (BDI 14–19) at the 1-month and 1-year follow-up. Two participants did not respond and remained at a moderate/severe level of depression at 1-year follow-up. Reductions on the secondary mental health measures and increases in mindfulness and satisfaction with life were found up to 1 year post-ceremony. Improvements in clinical depression and mental health correlated with levels of experienced ego dissolution and oceanic boundlessness during the ceremony up to 1 month after the ceremony. Engagement in additional mental health treatments or use of another psychedelic during study participation may have contributed to improved mental health ratings at 1-year follow-up.
Conclusion: Ayahuasca produces long-term mental health improvements in clinically depressed patients, which highlights its therapeutic potential.
Oxytocin, welches primär als Hormon bekannt ist, beeinflusst als Neuromodulator viele kognitive Prozesse, die an sozialem Verhalten, wie Sprache, beteiligt sind. Einerseits verändert es akustische Merkmale von gesprochener Sprache, andererseits erleichtert es auf perzeptueller Ebene die Emotionserkennung in der Sprachwahrnehmung und Körpersprache. Bislang war nicht bekannt, wie Oxytocin Hirnaktivität während des Sprechens verändert. Wir hypothetisierten, dass dieser Neuromodulator ähnlich wie Dopamin kortiko-basale Schaltkreise bahnen könnte.
Wir führten eine doppelt-verblindete Verhaltens- und funktionelle Kernspintomographiestudie durch, in der 52 gesunde Probanden an zwei getrennten Untersuchungsterminen entweder intranasales Oxytocin oder ein Placebo erhielten. Die Teilnehmer lasen Sätze außerhalb des Kernspintomographen und im Scanner leise oder laut mit entweder neutraler oder fröhlicher Intonation vor.
Die Verabreichung von Oxytocin erhöhte den zweiten Formanten der produzierten Vokale. Höhere Frequenzen dieses akustischen Parameters wurden zuvor mit einer positiven Valenz gesprochener Sprache in Verbindung gebracht; jedoch konnten unabhängige Beurteiler*innen die akustischen Unterschiede in unserem experimentellen Setting nicht konsistent unterscheiden.
Als neuronales Korrelat verstärkte Oxytocin die präparatorische subkortikale Gehirnaktivität im ventralen Pallidum und Striatum. Auch kortikal erhöhte Oxytocin präparatorische Gehirnaktivität in Regionen des dorsalen wie auch des ventralen Sprachverarbeitungsstroms, in sensomotorischen Kortizes und limbischen sowie exekutiven Regionen. In einigen dieser Regionen modulierte der genetische Oxytocin- Rezeptor-Polymorphismus rs53576 die durch die Oxytocin-Verabreichung verursachte Gehirnaktivität. Ähnlich wie Dopamin modulierte Oxytocin außerdem kortiko-basale Schaltkreise, die an der Generierung von fröhlicher Prosodie beteiligt sind. Während der Vorbereitung von Sprache erhöhte der Neuromodulator die funktionelle Konnektivität zwischen dem ventralem Pallidum und dem dorsolateralen präfrontalen Kortex mit einem spiegelbildlichen Profil während des eigentlichen Sprechens, einen Effekt den wir als „gating“ (Bahnung) interpretierten.
Unsere Ergebnisse legen nahe, dass mehrere neuronale Prozesse, die der Sprachproduktion zugrundeliegen, durch Oxytocin moduliert werden. Das Muster ähnelt hierbei dem anderer Neuromodulatoren wie Dopamin. Die vorliegende Arbeit charakterisiert somit erstmals Oxytocineffekte auf die mit Sprachproduktion assoziierte Hirnaktivität und funktionelle Konnektivität.
Einleitung : Eine sinnvolle Einbindung von Pflegefachpersonen mit Hochschulabschluss in die Versorgungsabläufe wird international häufig mit besseren Behandlungsergebnissen bei den Patient*innen assoziiert. In Deutschland fehlt es derzeit noch an verlässlichen Zahlen über Absolvent*innen und deren Aufgabenfeldern. Ziel dieser Erhebung war daher, durch Wiederholung einer früheren Erhebung erneut den Anteil von Pflegefachpersonen mit Bachelor- oder Masterabschlüssen in der direkten Patient*innenversorgung zu ermitteln.
Methode: In einer Querschnittserhebung wurden die Pflegedirektor*innen der Universitätskliniken und Medizinischen Hochschulen (UK) Deutschlands mittels einer standardisierten Befragung nach der Anzahl der Pflegefachpersonen mit Hochschulabschlüssen (Bachelor, Master und Doktor) gefragt. Weitere Fragen betrafen deren Aufgabengebiete und Integrationsmaßnahmen. Die Daten wurden mittels deskriptiver Statistik ausgewertet.
Ergebnisse: Insgesamt konnten n = 29 gültige Fragebögen aus 35 UK in die Analyse eingeschlossen werden, daraus ergibt sich eine Rücklaufquote von 82,85%. Für insgesamt 18 UK konnte eine Steigerung der hochschulisch qualifizierten Pflegefachpersonen um n = 786, von 2015 (n = 593) auf 2018 (n = 1379) erreicht werden. Der Anteil an Pflegefachpersonen mit Hochschulabschluss in den teilnehmenden UK liegt bei 3,16% (SD = 1,66; Min - Max = 1,09 - 6,69; Q1 - Q3 = 1,49 - 4,04; 95% KI = 2,30 – 3,95). In der direkten Versorgung beträgt der Anteil 2,11% (SD = 1,40; Min – Max = 0,47 - 5,42; Q1 – Q3 = 0,87 – 3,16; 95% KI 1,36 - 2,76). Die Aufgabenschwerpunkte liegen im Bereich der Regelversorgung und Patient*innenedukation (Bachelorabsolvent*innen), der evidenzbasierten Pflegepraxisentwicklung (Masterabsolvent*innen) und Forschung (promovierte Absolvent*innen).
Diskussion: Im Vergleich zu 2015 ist der Anteil hochschulisch qualifizierter Pflegefachpersonen zwar angestiegen, doch er liegt immer noch auf einem sehr niedrigen Niveau. Die Hochschulabsolvent*innen nehmen versorgungs- und entwicklungsrelevante Aufgaben wahr, doch besteht hinsichtlich ihrer Aufgabengebiete Bedarf an kompetenzorientierter Differenzierung.
Glecaprevir/pibrentasvir, a pangenotypic, direct-acting antiviral combination approved for chronic hepatitis C virus treatment, has limited real-world evidence supporting 8-week therapy in compensated cirrhosis. We investigated effectiveness and safety of 187 hepatitis C virus-infected, treatment-naïve, patients with compensated cirrhosis receiving 8-week glecaprevir/pibrentasvir therapy in the German Hepatitis C-Registry between 2 August 2017 and 1 January 2020. Sustained virologic response was 98.4% (127/129) in the per-protocol analysis (excluding patients lost to follow-up or who discontinued treatment due to compliance) and was 85.8% (127/148) in patients with data available in an intention-to-treat analysis. Nineteen patients were lost to follow-up; nine genotype 3 patients, nine nongenotype 3 patients and one mixed genotype patient. One patient relapsed, and one died, unrelated to treatment. Adverse events (>5%) were fatigue and headache. Two serious adverse events occurred; no adverse events resulted in drug discontinuation. An 8-week glecaprevir/pibrentasvir therapy was effective and well-tolerated in this real-world analysis.
Hintergrund: Bei der Operation einer ATAD sind Patienten aufgrund multipler komplexer Faktoren gefährdet perioperative permanente neurologische Defizite zu erleiden. Da perioperative PND die Mortalität signifikant steigern, ist die Kenntnis über potentielle Risikofaktoren für ein PND von großem Wert, nicht zuletzt um bestmöglich auf jeden Patientenfall vorbereitet sein zu können und Therapiestrategien zu optimieren.
Diese retrospektive Studie soll prä- und intraoperative Risikofaktoren für die Entstehung eines PND nach der Operation einer ATAD herausfiltern.
Material und Methoden: Patientendaten von Patienten mit ATAD (n=305), die sich im Zeitraum von 2001 – 2017 am Universitätsklinikum Frankfurt in der Abteilung für Herz- und Gefäßchirurgie einer Operation unterzogen haben, wurden retrospektiv mittels univariater Analyse und multivariater logistischer Regression analysiert.
Ergebnisse: Die PND-Rate innerhalb der Studienpopulation betrug 13%. Mit hoher statistischer Signifikanz konnte eine Form der hämodynamischen Instabilität als präoperativer Risikofaktor für die Entstehung eines perioperativen PND identifiziert werden (OR 9,53; p<0.001). Weiterhin konnte gezeigt werden, dass das Vorhandensein einer Karotisstenose das perioperative PND-Risiko ungünstig beeinflusst (OR 2,68, p=0,04). Ein präoperativer Sinusrhythmus kann die perioperative PND-Rate günstig beeinflussen (OR 0,2, p=0,01). Die univariate Analyse konnte signifikant belegen, dass Operationszeiten > 300 Minuten und EKZ-Zeiten > 160 Minuten das PND-Risiko ungünstig beeinflussen. Andere Risikofaktoren wie z.B. die Art der Hirnperfusion oder der Grad des hypothermischen Kreislausstillstandes, die zumindest klinische Signifikanz zu haben scheinen, konnten in dieser Arbeit keine statistische Signifikanz erzielen, was ggf. Ausdruck der Limitationen retrospektiver Arbeiten ist.
Fazit: Eine hämodynamische Instabilität stellt einen präoperativen Risikofaktor für die Entstehung eines PND nach der Operation einer ATAD dar. Zu den identifizierten präoperativen Risikofaktoren, die die PND-Rate ungünstig beeinflussen gehört außerdem das Vorhandensein einer Karotisstenose, während das Vorhandensein eines Sinusrhythmus die PND-Rate günstig beeinflusst.
Das Zeitmanagement bei der Operation einer ATAD ist entscheidend, um peri-operativen PND vorbeugen zu können. Eine Operationszeit > 300 Minuten und eine EKZ-Zeit von > 160 Minuten sind mit wesentlich höheren PND-Raten assoziiert und stellen somit intraoperative Risikofaktorenfür die Entstehung eines PND bei der Operation einer ATAD dar.
Die akute Nierenschädigung ist ein häufiges klinisches Erscheinungsbild, das trotz der heutigen Erkenntnisse über pathophysiologische Abläufe in der Niere mit einer erhöhten Morbidität und Mortalität assoziiert ist. Die eigene Fähigkeit der Niere zur Regeneration stellt ein Potenzial dar, das durch die Unterstützung pro-regenerativer Faktoren das Patientenüberleben verbessern kann. Das Wissen, dass die akute Nierenschädigung ein reversibles Ereignis darstellt, bestärkt den Einsatz der Forschung pro-regenerative Einflussfaktoren zu bestimmen, deren Zusammenhang darzustellen und eine mögliche Strategie zur innovativen Therapie zu entwickeln. Um eine akute Nierenschädigung darzustellen und anschließend auf regenerative Prozesse zu untersuchen, wurde ein Cisplatin-induziertes in vitro-Schädigungsmodell an primären Tubulusepithelzellen (mTEZ) aus Wildtyp Mäusen etabliert. Nach Isolation und Kultivierung primärer mTEZ erfolgte die Schädigung mit Cisplatin, die anhand eines Zytotoxizitätsnachweises quantifiziert wurde. Makrophagen zeichnen sich durch ihre funktionale Vielfalt in physiologischen als auch pathophysiologischen Abläufen aus. Ihre Plastizität ermöglicht es ihnen, sich entsprechend des umgebenden Milieus mit ihrem Phänotyp anzupassen und folglich in Form eines pro-regenerativen Makrophagen Proliferation und Reparaturprozesse zu unterstützen. Für die Untersuchung einer Makrophagen-vermittelten, pro-regenerativen Wirkung auf geschädigte mTEZ wurden primäre Zellen aus dem Knochenmark von Mäusen isoliert und zu Makrophagen differenziert. Zur Ausprägung eines pro-regenerativen Makrophagen Phänotyps erfolgte die Stimulation der kultivierten Makrophagen durch Inkubation mit Interleukin-10 (IL-10) und die Herstellung eines konditionierten Mediums (KM). Lipocalin-2 (Lcn-2) ist bekannt als früher Biomarker im Rahmen der akuten Nierenschädigung, aber zeichnet sich zusätzlich durch seine pro-proliferative Wirkung und regenerative Funktion aus. Lcn-2 ist ein Protein, das Eisen mit hoher Affinität bindet und in Makrophagen als alternativer Eisen-Transportmechanismus dient. In der vorliegenden Untersuchung stellte sich bei Stimulation mit IL-10 ein pro-regenerativer Makrophagen Phänotyp dar, der sich durch eine erhöhte Eisenfreisetzung und dem erhöhten Nachweis von Eisen-beladenen Lcn-2 im KM auszeichnete (holo-Lcn-2). Um den Zusammenhang von Lcn-2 aus IL-10-stimulierten Makrophagen und die regenerativen Eigenschaften auf mTEZ zu untersuchen, wurde ein Versuchsaufbau etabliert, indem mTEZ mit Cisplatin geschädigt und anschließend ein KM von IL-10-stimulierten Wildtyp (WT) oder Lcn-2 knockout Makrophagen hinzugefügt wurde. Zusätzlich wurde ein rekombinantes holo-Lcn-2 hergestellt, das als Zugabe zu KM von Lcn-2 knockout Makrophagen der Wiederherstellung und der Untersuchung eines Lcn-2-abhängigen Mechanismus diente. Als Merkmal einer Zellregeneration wurden die epitheliale Integrität und die Reorganisation des Zytoskeletts bestimmt. Ergänzend konnte mit Hilfe der Expression von Proliferationsmarkern sowie einer Echtzeitmessung der Proliferationsrate eine zunehmende Proliferation geschädigter mTEZ nach Zugabe von KM aus Makrophagen in Abhängigkeit von Lcn-2 bewiesen werden. Anschließend wurde eine Analyse des Eisengehalts im Zelllysat von mTEZ durchgeführt. Hierbei konnte ein signifikanter Anstieg des Eisengehaltes in mTEZ nach Zugabe von KM aus WT Makrophagen als auch durch Ergänzung von rekombinanten holo-Lcn-2 zu KM aus Lcn-2 knockout Makrophagen nachgewiesen werden. In der Korrelation zwischen Eisenmenge im Zelllysat der mTEZ und der Proliferationsrate ergab sich eine zunehmende Proliferation mit Anstieg des Eisengehaltes der Zelle. Zusammenfassend ergaben unsere Untersuchungen, dass KM aus pro-regenerativen Makrophagen die Überlebensfähigkeit von mTEZ nach Cisplatin-Schädigung steigert. Es zeigte sich auch eine durch Lcn-2 geförderte epitheliale Integrität sowie ein pro-proliferativer Effekt. Die regenerativen Effekte an mTEZ wurden durch Lcn-2 aus KM von IL-10-stimulierten Makrophagen über seine Eisen-bindende Funktion vermittelt. Über die Ausschüttung von Lcn-2 vermitteln pro-regenerative Makrophagen vermutlich die Zell-Regeneration von mTEZ, indem Lcn-2 toxisches Eisen von geschädigten und apoptotischen Zellen aus der Umgebung bindet, es Zielzellen als holo-Lcn-2 zur Verfügung stellt und hierdurch die Proliferation induziert.
Understanding how epigenetic variation in non-coding regions is involved in distal gene-expression regulation is an important problem. Regulatory regions can be associated to genes using large-scale datasets of epigenetic and expression data. However, for regions of complex epigenomic signals and enhancers that regulate many genes, it is difficult to understand these associations. We present StitchIt, an approach to dissect epigenetic variation in a gene-specific manner for the detection of regulatory elements (REMs) without relying on peak calls in individual samples. StitchIt segments epigenetic signal tracks over many samples to generate the location and the target genes of a REM simultaneously. We show that this approach leads to a more accurate and refined REM detection compared to standard methods even on heterogeneous datasets, which are challenging to model. Also, StitchIt REMs are highly enriched in experimentally determined chromatin interactions and expression quantitative trait loci. We validated several newly predicted REMs using CRISPR-Cas9 experiments, thereby demonstrating the reliability of StitchIt. StitchIt is able to dissect regulation in superenhancers and predicts thousands of putative REMs that go unnoticed using peak-based approaches suggesting that a large part of the regulome might be uncharted water.
Highlights
• Single nucleotide variants (SNVs) may affect transcription factor (TF) binding
• Fast statistical approach to assess significance of differential TF binding for SNVs
• Validate new approach on in vitro and in vivo TF binding assays
• Applications on GWAS SNVs and large eQTL studies illustrate utility
Summary
Non-coding variants located within regulatory elements may alter gene expression by modifying transcription factor (TF) binding sites, thereby leading to functional consequences. Different TF models are being used to assess the effect of DNA sequence variants, such as single nucleotide variants (SNVs). Often existing methods are slow and do not assess statistical significance of results. We investigated the distribution of absolute maximal differential TF binding scores for general computational models that affect TF binding. We find that a modified Laplace distribution can adequately approximate the empirical distributions. A benchmark on in vitro and in vivo datasets showed that our approach improves upon an existing method in terms of performance and speed. Applications on eQTLs and on a genome-wide association study illustrate the usefulness of our statistics by highlighting cell type-specific regulators and target genes. An implementation of our approach is freely available on GitHub and as bioconda package.
Osteocalcin (auch Bone 6 la Protein [B G P] genannt), ein 49 Aminosäuren enthaltendes Knochenmatrixprotein, wird in den Osteoblasten synthetisiert und bei gesteigertem Knochenumsatz im Serum erhöht gefunden. Osteocalcin im Serum kann mittels eines Hadioimmunoassays gemessen werden. Die Werte steigen mit dem Lebensalter an und zeigen einen zirkadianen Rhythmus. Beim primären Hyperparathyreoidismus sind die Osteocalcinwerte erhöht. Bei Patienten mit Mammacarcinom zeigt ein Osteocalcinanstieg stets eine Metastasierung im Knochen an. Die Hyperthyreose geht mit erhöhten Osteocalcinwerten einher. Über den diagnostischen Wert einer Osteocalcinbestimmung beim Plasmozytom läßt sich zur Zeit noch keine sichere Aussage machen. Patienten mit einer histomorphometrisch gesicherten „low-turnover'"Osteoporose weisen niedrige Osteocalclnspiegel auf. Die stark erhöhten Osteocalcinwerte bei der renalen Osteopathie (sekundärer Hyperparathyreoidismus, Osteomalazie) sind z.T. auch au feine verminderte renale Elimination von Osteocalcin bei eingeschränkter glomerulärer Filtrationsrate zurückzuführen. Zusammenfassend stellt die Osteocalcinbestimmung eine Bereicherung der diagnostischen Möglichkeiten zur Beurteilung des Knochenumsatzes darf sollte vorerst jedoch noch vorwiegend wissenschaftlichen Fragestellungen vorbehalten sein.
Im Zeitraum von 1991 - 1992 wurden 2000 Stuhlproben von a) Tropenreisenden (n = 600), b) Patienten mit Durch fall (n = 500) und c) Patienten mit gastrointestinalen Symptomen, jedoch ohne Durchfall (n = 900) auf Campylobacter spp. untersucht Hierfür wurden drei Kultivierungsmethoden parallel eingesetzt: 7. eine Filtermembranmethode, 2. ein blutfreies Campylobacter-Selektivmedium und 3. ein Blutmedium mit Butzler-Supplement Zusätzlich wurde der Einfluß von Transportbedingungen untersucht mittels Vergleiches zwischen Nativ-Stuhlproben versus Stühlen, die in ein Transportnährmedium (Cary-Blair-Medium) gegeben worden waren (n = 517).
Insgesamt waren 54/2000 (2,7%) Stuhlproben positiv. Die Campylobacter-Auffindungsrate in flüssigen Stühlen (Gruppe B) lag dreifach höher im Vergleich zu nicht-durchfälligen Proben (p < 0.01). In den Gruppen b) und c) waren Patienten, die älter als 40 Jahre waren, signifikant seltener mit Campylobacter infiziert als jüngere Personen, während es bei den Tropenreisenden keinen Alterseffekt gab. Unter den drei Kultivierungsmethoden war das Filtermembranverfahren dasjenige mit der besten Campylobacter-Ausbeute (p < 0.01): Methode 1 ergab 57,5%, Methode 2 50% und Methode 3 40,7% positive Isolate. Durch den Einsatz von Cary-Blair-Transportmedium konnte die Campylobacter-Isolierungsrate um 25% gesteigert werden. Die am häufigsten isolierten Spezies waren C. jejuni und C. coli.
Das neue immunoluminometrische BeriLux® PSA - ein Test für das Routinelabor. Ein Methodenvergleich
(1993)
In dieser Studie wurde der immunoluminometrische BeriLux® PSA-Test mit zwei radio-immunologischen und einem fluorometrischen Verfahren verglichen. Für den BeriLux® PSA wurden an 150 gesunden Probanden (100 Männer und 50 Frauen) die Referenzbereiche ermittelt. Bei Männern lag die 95%-Perzentile bei 3,77 ng/ml, für Frauen lag die 95%-Perzentile bei0,1 ng/ml. Der Korrelationskoeffizient zwischen der immunoluminometrischen Methode und radioimmunologischen Methode liegt bei r = 0,99, die analytische Sensitivität von BeriLux9 PSA liegt bei 0,03 ng/ml. Die Stabilität der Serumproben bei Lagerungstemperaturen zwischen 2°C und 8°C ist über einen Tag garantiert. Über diesen Zeitraum hinaussollten Serumproben bei -20° C gelagert werden.
Purpose: To assess the diagnostic precision of three different workstations for measuring thoracic aortic aneurysms (TAAs) in vivo and ex vivo using either pre-interventional computed tomography angiography scans (CTA) or a specifically designed phantom model.
Methods: This retrospective study included 23 patients with confirmed TAA on routinely performed CTAs. In addition to phantom tube diameters, one experienced blinded radiologist evaluated the dimensions of TAAs on three different workstations in two separate rounds. Precision was assessed by calculating measurement errors. In addition, correlation analysis was performed using Pearson correlation.
Results: Measurements acquired at the Siemens workstation deviated by 3.54% (range, 2.78–4.03%; p = 0.14) from the true size, those at General Electric by 4.05% (range, 1.46–7.09%; p < 0.0001), and at TeraRecon by 4.86% (range, 3.22–6.45%; p < 0.0001). Accordingly, Siemens provided the most precise workstation at simultaneously most fluctuating values (scattering of 4.46%). TeraRecon had the smallest fluctuation (scattering of 2.83%), but the largest deviation from the true size of the phantom. The workstation from General Electric showed a scattering of 2.94%. The highest overall correlation between the 1st and 2nd rounds was observed with measurements from Siemens (r = 0.898), followed by TeraRecon (r = 0.799), and General Electric (r = 0.703). Repetition of measurements reduced processing times by 40% when using General Electric, by 20% with Siemens, and by 18% with TeraRecon.
Conclusions: In conclusion, all three workstations facilitated precise assessment of dimensions in the majority of cases at simultaneously high reproducibility, ensuring accurate pre-interventional planning of thoracic endovascular aortic repair.
Background: Opsoclonus-myoclonus syndrome (OMS) is a rare, immune-mediated neurological disorder. In adults, the pathogenesis can be idiopathic, post-infectious or paraneoplastic, the latter etiology belonging to the ever-expanding group of defined paraneoplastic neurological syndromes (PNS). In contrast to other phenotypes of PNS, OMS cannot be ascribed to a single pathogenic autoantibody. Here, we report the first detailed case of paraneoplastic, antibody-negative OMS occurring in association with a pancreatic neuroendocrine tumor (pNET).
Case presentation: A 33-year-old female presented with a two-week history of severe ataxia of stance and gait, dysarthria, head tremor, myoclonus of the extremities and opsoclonus. Her past medical history was notable for a metastatic pancreatic neuroendocrine tumor, and she was subsequently diagnosed with paraneoplastic opsoclonus-myoclonus syndrome. Further workup did not reveal a paraneoplastic autoantibody. She responded well to plasmapheresis, as she was refractory to the first-line therapy with corticosteroids.
Conclusions: This case expands current knowledge on tumors associated with paraneoplastic opsoclonus-myoclonus syndrome and the age group in which it can occur. It further adds evidence to the effectiveness of plasmapheresis in severe cases of opsoclonus-myoclonus syndrome with a lack of response to first-line therapy.
Structured management programs have been developed for single diseases but rarely for patients with multiple medications. We conducted a qualitative study to investigate the views of stakeholders on the development and implementation of a polypharmacy management program in Germany. Overall, we interviewed ten experts in the fields of health policy and clinical practice. Using content analysis, we identified inclusion criteria for the selection of suitable patients, the individual elements that should make up such a program, healthcare providers and stakeholders that should be involved, and factors that may support or hinder the program’s implementation. All stakeholders were well aware of polypharmacy-related risks and challenges, as well as the urgent need for change. Intervention strategies should address all levels of care and include all concerned patients, caregivers, healthcare providers and stakeholders, and involved parties should agree on a joint approach.
Zielsetzung: Ziel der Studie ist die Frage, ob es möglich ist, einen Kommunikationskurs für ca. 400 Studierende erfolgreich in ein Blended Learning-Format (asynchrone Theorievermittlung/digitaler synchroner Praxisteil) umzustellen. Hauptfokus war dabei die Beurteilung des subjektiven Lernzuwachses und die Frage, inwiefern die Bedeutung des Themas Kommunikation und Gesprächsführung online abgebildet werden kann. Die Betrachtung erfolgt auf Basis von Evaluationsergebnissen der Studierenden und Dozierenden dieses Kurses.
Methodik: Die Studierenden des vierten vorklinischen Semesters aus dem Jahr 2020 wurden durch einen Selbsteinschätzungsbogen zu Beginn sowie durch eine Evaluation nach Abschluss des Kurses befragt. Zusätzlich wurden die Rückmeldungen der Dozierenden zum Kurs ausgewertet. Um die Ergebnisse vergleichen und mögliche Unterschiede feststellen zu können, wurden die entsprechenden Selbsteinschätzungs- und Evaluationsergebnisse der vorangegangenen zehn Jahre (in Form von Präsenzkursen) herangezogen.
Ergebnisse: Im Onlineformat wurde ein deutlicher subjektiver Lernzuwachs angegeben, der höher ausfiel als in den Vorjahren in Präsenz. Die Eignung des Onlineformats wurde von Studierenden sowie Dozierenden eher kritisch bewertet, während die Kursatmosphäre positiv gesehen wurde. Die Relevanz ärztlicher Gesprächsführung wurde im Onlineformat insgesamt besonders gut bewertet.
Schlussfolgerung: Aufgrund der Evaluationsergebnisse werden die Erfahrungen mit dem Blended Learning-Format auch in Zukunft in das Kommunikations-Curriculum des Medizinstudiums der Goethe-Universität Frankfurt einfließen. Die Ergebnisse haben gezeigt, dass das Erlernen ärztlicher Gesprächsführung online gut möglich ist. Daher kann dieses Format für zukünftige neue Konzepte empfohlen werden.
Objectives: To assess the impact of noise-optimised virtual monoenergetic imaging (VMI+) on image quality and diagnostic evaluation in abdominal dual-energy CT scans with impaired portal-venous contrast.
Methods: We screened 11,746 patients who underwent portal-venous abdominal dual-energy CT for cancer staging between 08/2014 and 11/2019 and identified those with poor portal-venous contrast.
Standard linearly-blended image series and VMI+ image series at 40, 50, and 60 keV were reconstructed. Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of abdominal organs and vascular structures were calculated. Image noise, image contrast and overall image quality were rated by three radiologists using 5-point Likert scale.
Results: 452 of 11,746 (4%) exams were poorly opacified. We excluded 190 cases due to incomplete datasets or multiple exams of the same patient with a final study group of 262. Highest CNR values in all abdominal organs (liver, 6.4 ± 3.0; kidney, 17.4 ± 7.5; spleen, 8.0 ± 3.5) and vascular structures (aorta, 16.0 ± 7.3; intrahepatic vein, 11.3 ± 4.7; portal vein, 15.5 ± 6.7) were measured at 40 keV VMI+ with significantly superior values compared to all other series. In subjective analysis, highest image contrast was seen at 40 keV VMI+ (4.8 ± 0.4), whereas overall image quality peaked at 50 keV VMI+ (4.2 ± 0.5) with significantly superior results compared to all other series (p < 0.001).
Conclusions: Image reconstruction using VMI+ algorithm at 50 keV significantly improves image contrast and image quality of originally poorly opacified abdominal CT scans and reduces the number of non-diagnostic scans.
Advances in knowledge: We validated the impact of VMI+ reconstructions in poorly attenuated DECT studies of the abdomen in a big data cohort.
Measurements of vertical velocity from vertically pointing Doppler lidars are used to derive the profiles of vertical velocity variance. Observations were taken during the FESSTVaL (Field Experiment on Submesoscale Spatio-Temporal Variability in Lindenberg) campaign during the warm seasons of 2020 and 2021. Normalized by the square of convective velocity scale, the average vertical velocity variance profile follows the universal profile of Lenschow et al. (1980), however, daily profiles still show a high day-to-day variability. We found that moisture transport and the content of moisture in the boundary layer could explain the remaining variability of the normalized vertical velocity variance. The magnitude of the normalized vertical velocity variance is highest on clear-sky days, and decreases as the relative humidity increase and surface latent heat flux decrease in cloud-topped and rainy days. This suggests that moisture content and moisture transport are limiting factors for the intensity of turbulence in the convective boundary layer. We also found that the intensity of turbulence decreases with an increase in boundary layer cloud fraction during FESSTVaL, while the latent heating in the cloud layer was not a relevant source of turbulence in this case. We conclude that a new vertical velocity scale has to be defined that would take into account the moist processes in the convective boundary layer.
Measurements of vertical velocity from vertically pointing Doppler lidars are used to derive the profiles of normalized vertical velocity variance. Observations were taken during the FESSTVaL (Field Experiment on Submesoscale Spatio-Temporal Variability in Lindenberg) campaign during the warm seasons of 2020 and 2021. Normalized by the square of the convective velocity scale, the average vertical velocity variance profile follows the universal profile of Lenschow et al. (1980). However, daily profiles still show a high day-to-day variability. We found that moisture transport and the content of moisture in the boundary layer could explain the remaining variability of the normalized vertical velocity variance. The magnitude of the normalized vertical velocity variance is highest on clear-sky days and decreases as the absolute humidity increases and surface latent heat flux decreases on cloud-topped days. This suggests that moisture content and moisture transport are limiting factors for the intensity of turbulence in the convective boundary layer. We also found that the intensity of turbulence decreases with an increase in the boundary layer cloud fraction during FESSTVaL, while the latent heating in the cloud layer was not a relevant source of turbulence in this case. We conclude that a new vertical velocity scale has to be defined that would take into account the moist processes in the convective boundary layer.
Ziel der vorliegenden Untersuchung war es, die Analytik der Neurotransmitterbestimmung im Liquor zu etablieren und in das vorhandene Leistungsspektrum des Stoffwechsellabors zu integrieren. Die klinische Ausrichtung gilt sowohl der Detektion primärer Neurotransmitterdefekte als auch der Untersuchung der Ursachen und Auswirkungen sekundärer Neurotransmitterstörungen.
Die Messung der Biogenen Amine im Liquor mittels der Hochdruck-Flüssigkeits-Chromatographie in dem hier vorgestellten Verfahren konnte standardisiert und in das vorhandene Leistungsspektrum des Stoffwechsellabors des Zentrums für Kinderheilkunde und Jugendmedizin der J.W. Goethe-Universität, Frankfurt etabliert werden. Es ist nachgewiesenermaßen sensitiv, spezifisch und erlaubt eine schnelle und reproduzierbare Analyse bei minimaler Probenmenge und Probenaufarbeitung.
Meßtechnisch konnte durch den von unserer Arbeitsgruppe verwendeten ESA CoulArray® Detektor (Modell 5600) (im Gegensatz zu den bisher beschriebenen amperometrischen Detektoren) aufgrund seiner 16 einzelnen coulometrischen Sensoren eine enorme Verbesserung der Nachweisqualität der untersuchten Neurotransmittersubstanzen erreicht werden. Aufgrund verschiedener Potentialfelder ist eine spezifische Detektion über einen weiten Einsatzbereich aufgrund der elektrochemischen Unterschiede zu erzielen. Dies ermöglicht eine wesentlich größere Anzahl zu detektierender Substanzen eindeutig zu identifizieren und erlaubt damit nicht nur die eindeutige Zuordnung der zu messenden Endabbauprodukte HVA und 5HIAA, sondern auch des gesamten Spektrums der vorgeschalteten Metabolite. Somit ließ sich mit diesem aufgebauten Analysesystem die komplexe vollständige Abbildung des Stoffwechselwegs der zentralen biogenen Amine verwirklichen.
Die sehr sensible Messung der Parameter stellt große Anforderung an
Probengewinnung, Probenverarbeitung und Meßanalyse. Aufgrund der
Durchführung interner Qualitäskontrolluntersuchungen konnte der Nachweis einer sicheren reproduzierbaren Analytik erbracht werden. Insbesondere die Notwendigkeit der ausreichenden Unterdrückung der weiter ablaufenden chemischen Prozesse durch die unmittelbare Kühlung der Liquorproben auf eine Temperatur von -80°C wurde nachgewiesen. Zusätzlich konnte gezeigt werden, dass die Verwendung von handelsüblichen EDTA-Röhrchen einen ausreichenden antioxidativen Schutz bietet und wir somit eine anwenderfreundliche Probengewinnung empfehlen können. Die strikte Einhaltung des Protokolls zur Gewinnung und weiteren Verarbeitung der Liquorproben ist elementar und stellt insbesondere bei zur Zeit noch bestehenden uneinheitlichen altersabhängigen Referenzwerten die Grundlage zur diagnostischen Bewertung der gemessenen Werte dar. Eine Standardisierung der Referenzwerte auf internationaler Ebene ist unverzichtbar zur korrekten Interpretation der gemessenen Daten und sollte vorrangiges Streben aller beteiligten Laboratorien sein. Ein entsprechender Antrag auf ein erneutes, jährlich stattfindendes externes Qualitätskontrollprogramm (Ringversuch) wurde gestellt.
Mit der Bestimmung der Biogenen Amine im Liquor steht ein potentes Instrument zur Detektion pädiatrischer Neurotransmittererkrankungen zur Verfügung. Es gibt weltweit jedoch nur eine geringe Anzahl von Laboratorien mit diesem Analyseangebot. Somit trägt die Etablierung dieser Analytik im vorhandenen Leistungsspektrum des Stoffwechsellabors des Zentrums für Kinderheilkunde und Jugendmedizin der J.W. Goethe-Universität, Frankfurt dazu bei diese Lücke zu schließen. In der Mehrzahl sind Erkrankungen der zentralen Biogenen Amine ausschließlich nur über eine Messung der Metaboliten im Liquor diagnostizierbar, nur wenige angeborene Neurotransmitterdefekte fallen durch periphere Serumparameter, wie z.B. einer Hyperphenylalaninämie auf. Es ergibt sich der Verdacht, dass diese Erkrankungsformen unterdiagnostiziert sind und auch das Wissen um diese Erkrankungen nicht allgemein vorausgesetzt werden kann.
Mit den Neurotransmittervorstufen (z.B. L-Dopa oder 5OH-Tryptophan) steht betroffenen Patienten eine adäquate Therapieoption zur Verfügung, so dass die Aufdeckung eines spezifischen Defektes in der Synthese der Biogenen Amine vorrangiges Ziel sein müsste. Exemplarisch für die beeindruckende Effektivität der Therapie mittels L-Dopa und 5OH-Tryptophan sei auf den Erfahrungsbericht des von unserer Arbeitsgruppe betreuten Patienten mit 6-PTPS-Defekt verwiesen.
Zusätzlich konnte mit dieser Arbeit gezeigt werden, dass die wiederholenden Messungen dem Therapiemonitoring dienen und eine unverzichtbare Grundlage der individuellen Therapie betroffener Patienten darstellen. Sekundäre Veränderungen der Neurotransmission sind beschrieben, jedoch fehlen weitergehende Untersuchungen zur Einordnung ihrer klinischen Relevanz. Gerade diese große inhomogene Patientengruppe stellt eine zukünftige Herausforderung für weitere wissenschaftliche Anstrengungen in diesem Bereich dar. Wie anhand des Beispiels der Patienten mit mitochondrialer Enzephalopathie dargestellt, kann die vorhandene Analysemethode dazu beitragen das Wissen um die Pathophysiologie bekannter Erkrankungen zu erweitern. Da analog zu den primären Erkrankungen auch hier Therapieoptionen zur Verfügung stehen würden, ist es dringend notwendig die übliche Liquordiagnostik diesbezüglich auszudehnen. Aufgrund der auch im Rahmen dieser Arbeit erhobenen Daten kann gefolgert werden bei ungeklärten neuropädiatrischen Erkrankungen, besonders jenen, welche in der Neonatal- oder frühen Säuglingszeit beginnen und progredient verlaufen, und sich klinisch durch Dyskinesien, Krampfanfälle und Enzephalopathien äußern, eine Liquoruntersuchung auf Biogene Amine zu veranlassen.
Somit dient die erbrachte Arbeit zur Etablierung der Analytik der Neurotransmitterbestimmung im Liquor dem Erkenntnisgewinn neuer metabolischer Erkrankungen, erweitert das Grundlagenwissen bekannter Störungen und dient der Detektion seltener, jedoch oft schwerwiegender Erkrankungen.
In der vorliegenden Arbeit präsentieren wir die Daten von perkutanen Interventionen im Bereich der Beckenstrombahn, welche retrospektiv der Klassifikation der Transatlantic Society Consensus Gruppe (TASC) folgend als TASC C und D kategorisiert wurden. Für TASC D Läsionen wurde von der TASC Gruppe die chirurgische Therapie empfohlen. Für TASC C Läsionen konnte mangels aussagekräftiger Daten keine konkrete Empfehlung bezüglich einer chirurgischen oder interventionellen Behandlung ausgesprochen werden und man berief sich auf die nach wie vor weit verbreitete Anwendung gefäßchirurgischer operativer Therapie im Fall dieser Läsionen.
Ziel dieser Arbeit war es, herauszuarbeiten, ob bei Behandlung von Gefäßläsionen dieser beiden Klassifikationen mit perkutaner transluminaler Angioplastie akzeptable Erfolgs- und Offenheitsraten erreicht werden können und ob eine Empfehlung zu Gunsten der interventionellen Therapie ausgesprochen werden kann.
In einem Zeitraum von Januar 2000 bis Dezember 2002 wurden an unserem Institut 253 Patienten mit 294 Läsionen im Bereich der Beckenarterien interventionell behandelt. Unter ihnen befanden sich 89 Patienten mit 129 klassifizierten TASC C und D Läsionen, 110 Stenosen (65 in der AIC und 45 in der AIE) und 19 Okklusionen (12 in der AIC und 7 in der AIE). Die durchschnittliche Länge der Läsion betrug 49,2±31,2 mm. Zum Einsatz kamen 148 Stents. Der technische Erfolg der Interventionen betrug 96,9%. Komplikationen traten bei 5,6% der Patienten auf, wobei wir in keinem dieser Fälle eine periphere Embolie verzeichneten. Die Nachbehandlung erfolgte über einen Zeitraum von 12-38 Monate, durchschnittlich 25 Monate. Nachuntersuchungen umfassten eine klinische Untersuchung, die Messung des Tibial-Brachialen-Quotienten und eine Duplex-Sonographie am ersten Tag postinterventionell, nach 1, 3, 6 und 12 Monaten und anschließend einmal jährlich.
Aus den Nachuntersuchungen ergab sich gemessen an den Kriterien der AHA ein klinischer Erfolg bei 97,3% der TASC C Patienten und 88,5% der Patienten mit TASC D Läsionen. Im Verlauf der Nachbeobachtungszeit kam es zu 6 Restenosen und einer Reokklusion im behandelten Gefäßsegment, von denen 4 erfolgreich mit Hilfe einer zweiten Intervention therapiert werden konnten. Bei 3 Patienten bedurfte es operativer Eingriffe in Form zweier aortoiliakaler Bypässe und einer Unterschenkelamputation.
Es ergab sich somit nach durchschnittlich 25 Monaten eine primäre Offenheitsrate von 89,9% und eine sekundäre Offenheitsrate von 95,5%. Die von uns präsentierten Daten sind mit den nach Behandlung fokaler, kurzstreckiger (<10 cm) Stenosen publizierten Daten vergleichbar.
Die Ergebnisse dieser Studie zeigen, dass die perkutane Rekanalisation sowohl im Falle der TASC C als auch der TASC D Läsionen mit hohem technischen und hohem klinischen Erfolg, einer niedrigen Komplikationsrate und viel versprechenden Offenheitsraten durchgeführt werden kann. Interventionelle Therapie kann somit durchaus auch für die Behandlung von Läsionen der Klassifikation TASC C und D empfohlen werden.
Bei einer fortgeschrittenen oro-vestibulären Alveolarfortsatzatrophie, die durch einen länger zurückliegenden Zahnverlust, Zahntrauma oder Entzündung bedingt ist, ist die Indikation zu einer Implantation häufig ohne zusätzliche Aufbaumaßnahmen des Alveolarkammes nicht möglich. Osteoplastische Verfahren, die der transversalen Kieferkammerweiterung dienen, können in diesen anatomisch schwierigen Ausgangsbedingungen zur Anwendung kommen.
Die vorliegende Studie sollte die Ergebnisse nach Anwendung eines minimal invasiven chirurgischen Verfahrens (Bone-spreading) mit Hilfe eines speziellen Instrumentensystems bewerten.
Über einen Zeitraum von 8 Jahren wurden bei 53 Patienten (24 Männern, 29 Frauen), die ein primär unzureichendes transversales Knochenangebot aufwiesen, 129 Implantate simultan mit der Bone-spreading-Technik inseriert. Die mittlere Liegedauer der Implantate betrug 3,81 Jahre. Zum Zeitpunkt der letzten Nachuntersuchung standen die Implantate durchschnittlich 3,39 Jahre unter funktioneller Belastung. Die Verteilung der inserierten Implantate erstreckte sich sowohl auf den Oberkiefer (57,36 % der Implantate) als auch den Unterkiefer (42,64 % der Implantate). Die prothetischen Versorgungen der 129 Implantate wurden mit 71 Implantaten als Krone, mit 44 als Brücke und mit jeweils 7 Implantaten als Konus- und Resilienzteleskope zementiert.
Die klinischen Daten (modifizierter Plaque-Index, modifizierter Sulcus-Blutungs-Index, Sondierungstiefe mesial und vestibulär, periimplantäre Mucosa, Breite der Gingiva propria, klinische Mobilität, Periotestwert) und die radiologischen Befunde (horizontaler und vertikaler Knochenabbau) wurden im Rahmen von jährlichen Recalluntersuchungen erhoben und analysiert.
Die Werte der Entzündungs-Indizes waren im allgemeinem stabil. So konnte bei 88 % der Patienten bei der letzten Nachuntersuchung kein höherer Wert von Plaqueindex als 1 (= nicht sichtbar, hauchdünner Belag) beobachtet werden. Auch der Sulcus-Blutungs-Index war zufriedenstellend. Hier wiesen 91 % der Patienten bei der letzten Nachuntersuchung keine Blutung bzw. nur einen Blutungspunkt, aber keine Farbveränderung oder Schwellung der Gingiva auf. Ähnlich verhielten sich die Werte der Sondierungstiefen. Diese Ergebnisse
spiegelten sich in den stabilen periimplantären Verhältnisse wider, die bei 93,81 % der Probanden bei der letzten Nachuntersuchung vorgefunden wurden. Die gemessenen Periotestwerte entsprachen denen eines osseointegrierten Implantates. Sie lagen bei der letzten Nachuntersuchung im Schnitt bei –2,7. Der radiologisch ermittelte periimplantäre Knochenabbau war bei den hier inserierten Implantaten nicht größer als 0,2 mm pro Jahr. So konnte bei 85,27 % der unter Funktion stehenden Implantate kein bzw. nur ein minimaler horizontaler Knochenabbau vorgefunden werden, bei weiteren 13,95 % ging der horizontale Knochenabbau nicht über ein Viertel der Implantatlänge hinaus. Ähnlich verhielt sich der vertikale Knochenabbau. Kein bzw. nur ein minimaler Knochenabbau war bei 59,06 % der Patienten, ein bis zu einem Viertel bei 39,09 % vorzufinden. Ein Implantatverlust ist während der gesamten Beobachtungszeit nicht eingetreten. Das entsprach einer Überlebensrate von 100%.
Die bisherige Untersuchung über 8 Jahre zeigte, daß die orale Rehabilitation mit osseointegrierten Implantaten unter Anwendung der Bone-spreading-Methode sowohl bei einem transversalen Knochenangebot ab einer Alveolarfortsatzbreite von 3 mm als auch in den Knochenklassen D1 und D2, die vornehmlich im Unterkiefer vorzufinden sind, erfolgreich ist.
Background: In the Computer Tomography imaging, examinations for the diagnosis of lesions of the upper abdomen currently use water-soluble, iodinated, non-ionic contrast agents with low molecular weight. One possibility to reduce the time of the examination and X-ray exposure is to increase the injection rate. However, higher injections rates lead to increased hypersensitivity reactions and extravasation rates. Furthermore, cardiac pump function does not always allow for the transportation of such a large volume within one heartbeat. With a contrast agent of higher iodine concentration, the injection rate may be reduced without decreasing the iodine delivery rate while reducing the volume load of the heart.
Aim: to compare the performance and image quality of two injection protocols of contrast medium for multiphasic CT imaging of malignant hepatic lesions; one using Imeron 300 at an injection rate of 5 ml/ sec and the second using Imeron 400 at an injection rate of 3,7 ml/ sec, for multiphasic CT imaging of malignant hepatic lesions, in order to optimise the iodine concentration and injection rate of the contrast agent Imeron in the Multislice Spiral-CT of the upper abdomen.
Materials and methods: the current prospective, single centre, double-blinded, randomised and interindividual comparison study included 50 patients (29 males and 21 females) with a mean age of 63,3 years. Patients were randomised to one of the two injection protocols. Image evaluation included qualitative assessment (technical quality, presence of artefacts and overall contrast quality) and quantitative assessment (measuring the difference in HU between the lesion and the surrounding hepatic tissue). The difference between both protocols was tested for statistical significance using the Wilcoxon-Mann-Whitney test and the Two-Sample t-test.
Results: there was no statistically significant difference between both protocols regarding the technical quality of images, both in the AP (p = 0,46) and in the venous phase (p = 0,48). Additionally, no statistically significant difference was found regarding the presence of artefacts related to the contrast medium, both in the AP (p = 0,46) and in the venous phase (p = 0,46), as well as regarding the overall contrast quality of images both in the AP (p = 0,50) and in the venous phase (p = 0,48). Quantitative assessment showed no statistically significant difference regarding the difference in HU measurement between the hepatic lesion and the surrounding hepatic tissue, both in the AP (p = 0,36) and in the venous phase (p = 0,92).
Conclusion: in the multiphasic CT imaging of the liver, reducing the injection rate of the contrast medium Imeron from 5 ml/ sec to 3,7 ml/ sec while increasing the iodine strength of the agent from 300 to 400 mg/ml, respectively, and thus keeping the iodine injection flow rate constant, produces similar signal intensities and results in similar technical, image and overall contrast qualities..
Keywords: Contrast-medium, injection rate, iodine concentration, hepatic malignancy, multiphasic CT
Die E3-Ubiquitinligase TRIM25 ist in verschiedenen humanen Tumoren verstärkt exprimiert, was häufig mit einer schlechten Prognose der betroffenen Patienten sowie dem Auftreten von Therapieresistenzen korreliert. Unsere Arbeitsgruppe konnte TRIM25 zuvor als Caspase-2 und -7 mRNA-bindendes Protein und negativen Regulator beider Caspasen in humanen Kolonkarzinomzellen identifizieren. Ein transienter TRIM25 Knockdown führt in Abhängigkeit der erhöhten Expression der jeweiligen Caspasen zur Sensitivierung der Kolonkarzinomzellen gegenüber Chemotherapeutika-induzierter Apoptose. Ein Ziel dieser Arbeit war, die Übertragbarkeit dieser Erkenntnisse auf einen loss-of-function-Ansatz mit stabilen TRIM25 Knockdown Zellen zu überprüfen. Die stabilen Knockdown Zellen sollten der späteren Etablierung eines Xenograftmodells dienen. Da zahlreiche TRIM Proteine bekannterweise eine vielseitige Rolle bei der Regulation sowohl onkogener als auch tumorsuppressiver Prozesse einnehmen, wurde als weitere maßgebliche Fragestellung dieser Arbeit der Einfluss von TRIM25 auf wichtige tumorigene Eigenschaften wie Proliferation, Migration, Zellzyklus und Inflammation untersucht. TRIM25-abhängige Effekte auf das Migrationsver halten von RKO-Zellen wurden im in vitro-Wundheilungsassay mit stabilen TRIM25 Knock down Zellen analysiert. Aufgrund hoher interexperimenteller Unterschiede im Migrations verhalten derselben Zellklone konnte hinsichtlich einer TRIM25-abhängigen Regulation der Migration jedoch keine eindeutige Aussage getroffen werden. Dagegen belegten die gezeigten Proliferationsassays eine signifikant vermehrte Proliferation von RKO-Zellen nach stabilem TRIM25 Knockdown. Dies legt eine tumorsuppressive Rolle von TRIM25 nahe. Durch flusszytometrische Analysen stabiler TRIM25 Knockdown und Kontrollzellen zeigten hinge gen keinen konsistenten Einfluss von TRIM25 auf den Zellzyklus von RKO-Zellen. Eine Sensitivierung von Kolonkarzinomzellen gegenüber Chemotherapeutika-induzierter Apoptose konnte auch in stabilen TRIM25 Knockdown Zellen nachgewiesen werden, während die für transiente Ansätze bekannte, TRIM25 Knockdown-abhängige Hochregulation von Caspase 2 und -7 dagegen deutlich geringer ausgeprägt war. Dies lässt vermuten, dass die Tumorzellen einer Hochregulation Zelltod-induzierender Proteine bei einem konstitutiven TRIM25Knockdown gegenregulieren. Aufgrund der aber nach wie vor nachweisbaren Sensitivierung der TRIM25 Knockdown Zellen gegenüber Apoptose, können zusätzliche, bisher noch nicht bekannte Mechanismen postuliert werden, welche zur Sensitivierung dieser Zellen gegenüber Apoptose beitragen. Die daraus abgeleitete, TRIM25-abhängige Apoptosehemmung spricht für einen „Überlebensmechanismus“, welcher maßgeblich zur Chemotherapieresis tenz von Kolonkarzinomzellen beitragen kann. Hinsichtlich eines Einflusses von TRIM25 auf entzündliche Prozesse wurden RKO-Zellen mit klassischen Aktivatoren des NLRP3-Inflammasoms stimuliert und ausgewählte Marker mittels Western Blot-Analysen nachgewiesen. TRIM25 Knockdown-abhängig war eine verminderte Spaltung der Apoptosemarker Caspase-3, -7 und PARP-1 nachweisbar. Caspase-7 und PARP-1 spielen bekanntermaßen auch im Rahmen Inflammasom-induzierter Signalprozesse eine wichtige Rolle, während die Spaltung von Caspase-3 durch das NLRP3-Inflammasom induziert werden kann und v.a. für apoptotische oder pyroptotische Prozesse verantwortlich gemacht wird. Daher kann postuliert werden, dass der stabile TRIM25 Knockdown zur Hemmung von Inflammasom-induzierten Signalprozessen führt und darüber Kolonkarzinomzellen vor Apoptose/Pyroptose geschützt werden. Umgekehrt deutet dies auf eine Aktivierung von Inflammasom-vermittelten Signalprozessen durch TRIM25 hin.
Aufgrund der hohen Inzidenz und Mortalität, der schlechten Prognose und der Entwicklung von Therapieresistenzen besteht ein dringender Bedarf in der Entwicklung neuer, verbesserter Therapien des kolorektalen Karzinoms sowie der Resensibilisierung der Krebszellen gegenüber gängigen, bereits bestehenden Therapieoptionen. Im Rahmen dieser Arbeit konnte ein onkogener Einfluss von TRIM25 auf Kolonkarzinomzellen durch Hemmung Chemotherapeutika-induzierter Apoptose nachgewiesen werden, während eine mögliche tumorigene Rolle von TRIM25 durch zusätzliche Aktivierung Inflammasom-induzierter Signalprozesse weiterer Untersuchungen bedarf. Zusammenfassend kann TRIM25 als vielversprechender therapeutischer Angriffspunkt für die Entwicklung von sowohl neuen antientzündlichen als auch tumorsuppressiven Therapien betrachtet werden.
Die radikale Prostatektomie (RP) stellt neben der Radiatio der Prostata den Goldstandard der Lokaltherapie des lokalisierten Prostatakarzinoms (PCa) dar. Neben der Erzielung einer postoperativen Tumorfreiheit (onkologisches Ergebnis), spielen die postoperativen, funktionellen Ergebnisse (z.B. Erektionsfähigkeit, Urin-Kontinenz) nach RP für die Patienten eine zentrale Rolle. Hierbei ist vor allem die (Wieder-) Erlangung der postoperativen Kontinenz hervorzuheben, da das Ausbleiben mit einem substantiellem Verlust der Lebensqualität einhergeht und eine deutliche Einschränkung im Alltag darstellt. Verschiedene Tumor- und Patientencharakteristika (pathologisches Tumorstadium, Body Mass Index [BMI], Alter, Prostatavolumen) wurden in vorangegangenen Publikationen als Faktoren identifiziert, die Einflüsse auf die Wiedererlangung der Kontinenz nach RP haben. Interessanterweise jedoch, wurde der Einfluss von Diabetes Mellitus auf die Kontinenz-Rate zum jetzigen Stand nur unzureichend und teils mit widersprüchlichen Ergebnissen untersucht. In Anbetracht der vorbekannten protrahierten Wundheilungsverläufe sowie Mikrozirkulationsstörungen und Neuropathie bei Diabetes mellitus Patienten, hat die jetzige Studie deshalb untersucht, ob das Vorliegen von Diabetes Mellitus einen Einfluss auf die postoperative Früh-Kontinenz bei PCa-Patienten hat, die eine RP erhalten haben.
Nach Vorliegen des Ethikkomitee-Beschluss erfolgte mit Hilfe der RP-Datenbank der Klinik für Urologie, Johann Wolfgang-Goethe-Universität die Patientenidentifizierung im Zeitraum von 2018 bis 2021. Hierbei wurden Patienten in die Studienkohorte eingeschlossen bei denen Informationen bezüglich der Früh-Kontinenz (30-90 Tage postoperativ) vorlagen. Kontinenz wurde definiert als die Verwendung von keiner bzw. einer Sicherheitsvorlage innerhalb eines Zeitraums von 24 Stunden. Neben Auswertung der Kontinenz-Raten hinsichtlich des Diabetes Mellitus Status, erfolgte die Zuhilfenahme von uni- und multivariablen logistische Regressionsanalysen um den Effekt von Diabetes Mellitus auf die Kontinenz zu untersuchen. Kovariablen beinhalteten das pathologisches Tumorstadium, BMI, Alter, OP-Verfahren und Durchführung einer Nerv-Erhaltung.
Innerhalb der Studienkohorte (n=142) lag eine Diabetes Mellitus Erkrankung bei 15 Patienten (11%) vor. Mit Ausnahme eines höheren BMI (Median: 28.6 vs 26.5 m2/kg; p=0.005) bei Diabetes Mellitus Patienten, bestanden keine signifikanten Unterschiede hinsichtlich Patienten und Tumorcharakteristika zwischen den beiden Gruppen (p>0.05). Die Früh-Kontinenz Rate war bei Diabetes Mellitus Patienten geringer im Vergleich zu der restlichen Studienkohorte (33 vs 63%; p=0.03). Dieser Unterschied spiegelte sich ebenfalls in der univariablen logistischen Regressionsanalyse wider, in der Diabetes Mellitus einen signifikanten Einfluss auf die Früh-Kontinenz aufwies (Odds Ratio [OR]: 0.29, 95%-KI [95%-Konfidenz Interval]: 0.09-0.99; p=0.03). Der signifikante Einfluss von Diabetes Mellitus blieb ebenfalls in der multivariablen logistischen Regressionsanalyse fortbestehen, nachdem weitere Kovariablen berücksichtigt wurden (OR: 0.26; 95%-KI: 0.07-0.86; p=0.03). Unter Berücksichtigung der Limitationen der vorliegenden Studie (retrospektives Studiendesign, limitierte Fallzahl) lassen die Ergebnisse darauf schließen, dass das Vorliegen einer Diabetes Mellitus Erkrankung einen negativen Einfluss auf die Wiedererlangung der Kontinenz zu einem frühen Zeitpunkt nach RP hat. Die vorliegenden Ergebnisse haben für den klinischen Alltag wichtige Implikationen. Im Rahmen der Aufklärung vor RP kann der Patient bezüglich seines individuellen Risikos einer verlängerten postoperativen Inkontinenz entsprechend aufgeklärt werden, um somit die Erwartungshaltung des Patienten realitätsgetreu zu adressieren. Betrachtet man den postoperativen Verlauf, legen die vorliegenden Ergebnisse nahe, dass Diabetes mellitus Patienten aufgrund Ihrer geringeren Früh-Kontinenz Rate von einer intensivierte Beckenboden-Training zur Wiedererlangung der Kontinenz besonders profitieren könnten.
Auf der Grundlage dieser Studie sollten multizentrische Studien mit einer umfangreicheren Kohortengröße erfolgen und den Einfluss von Diabetes Mellitus nicht nur auf die Früh-Kontinenz, sondern ebenfalls auf die langfristige Kontinenz (>12 Monate) zu untersuchen
Beside mosquitoes, ticks are well-known vectors of different human pathogens. In the Northern Hemisphere, Lyme borreliosis (Eurasia, LB) or Lyme disease (North America, LD) is the most commonly occurring vector-borne infectious disease caused by bacteria of the genus Borrelia which are transmitted by hard ticks of the genus Ixodes. The reported incidence of LB in Europe is about 22.6 cases per 100,000 inhabitants annually with a broad range depending on the geographical area analyzed. However, the epidemiological data are largely incomplete, because LB is not notifiable in all European countries. Furthermore, not only differ reporting procedures between countries, there is also variation in case definitions and diagnostic procedures. Lyme borreliosis is caused by several species of the Borrelia (B.) burgdorferi sensu lato (s.l.) complex which are maintained in complex networks including ixodid ticks and different reservoir hosts. Vector and host influence each other and are affected by multiple factors including climate that have a major impact on their habitats and ecology. To classify factors that influence the risk of transmission of B. burgdorferi s.l. to their different vertebrate hosts as well as to humans, we briefly summarize the current knowledge about the pathogens including their astonishing ability to overcome various host immune responses, regarding the main vector in Europe Ixodes ricinus, and the disease caused by borreliae. The research shows, that a higher standardization of case definition, diagnostic procedures, and standardized, long-term surveillance systems across Europe is necessary to improve clinical and epidemiological data.
The sympathetic nervous system (SNS) is a major regulatory mediator connecting the brain and the immune system that influences accordingly inflammatory processes within the entire body. In the periphery, the SNS exerts its effects mainly via its neurotransmitters norepinephrine (NE) and epinephrine (E), which are released by peripheral nerve endings in lymphatic organs and other tissues. Depending on their concentration, NE and E bind to specific α- and β-adrenergic receptor subtypes and can cause both pro- and anti-inflammatory cellular responses. The co-transmitter neuropeptide Y, adenosine triphosphate, or its metabolite adenosine are also mediators of the SNS. Local pro-inflammatory processes due to injury or pathogens lead to an activation of the SNS, which in turn induces several immunoregulatory mechanisms with either pro- or anti-inflammatory effects depending on neurotransmitter concentration or pathological context. In chronic inflammatory diseases, the activity of the SNS is persistently elevated and can trigger detrimental pathological processes. Recently, the sympathetic contribution to mild chronic inflammatory diseases like osteoarthritis (OA) has attracted growing interest. OA is a whole-joint disease and is characterized by mild chronic inflammation in the joint. In this narrative article, we summarize the underlying mechanisms behind the sympathetic influence on inflammation during OA pathogenesis. In addition, OA comorbidities also accompanied by mild chronic inflammation, such as hypertension, obesity, diabetes, and depression, will be reviewed. Finally, the potential of SNS-based therapeutic options for the treatment of OA will be discussed.
Autism Spectrum Disorder (ASD) is a neurodevelopmental condition with an onset in early development. ASD has varying degrees of severity and thus affects people differently throughout their lives. Early diagnosis of ASD is essential to provide children with individually-tailored support.8 Eye-tracking may contribute to an earlier diagnosis: Several studies showed differences in eye movements between people with autism spectrum disorder (ASD) and typically developing controls (TD). Different eye movements may contribute to different visual perception that perpetuates to problems in attention, communication and social interaction.
Eye movements are divided into: (1) Fixations (2) Saccades (fast and short eye movements) and (3) Smooth Pursuit Eye Movements (SPEM). SPEM follow the target in a continuous manner. The latter are the subject of the present thesis. SPEM consist of two phases: the open loop phase (= phase of initiation, first 50- 100ms) and the closed loop phase (= phase of maintenance, after about 100ms). SPEM are usually measured by a gain index. It is defined as the ratio of smooth pursuit velocity and visual target velocity and ideally equals to 1.2
In young children, corneal-reflection (CR) eye-tracking is usually applied to quantify eye movement. It allows precise measurements without the use of potentially intrusive devices.
Studies in ASD reported deficits in open loop and closed loop pursuit in children and adults with a mean age of 19.32 (TD) and 20.04 (ASD) years. However, SPEM in preschoolers with ASD remain understudied, although this developmental phase is crucial to the development of non-social and social attentional abilities.
In the present study 66 toddlers and preschoolers (18 to 72 months; ASD: n = 33, TD: n = 33) with matched cognitive abilities and sex were assessed. The main objective was to compare the gain index (Smooth Pursuit Gain = SPG). SPEM were compared between groups with gain index as a dependent measure. We hypothesized that participants with ASD show lower average gain compared to the control group.
We could show a significant group influence on the gain when considering interactions between target velocity and group (p = 0.041). The TD group showed a greater dependence on the increasing object speed than the ASD group with a trend of -0.30 ± 0.11 in the TD group and a trend of -0.13 ± 0.12 in the ASD group. Across groups, the gain decreased with increasing target velocity and dropped faster in vertical than in horizontal trials. Additionally, participants showed a lower SPG in vertical sequences than in horizontal sequences. This supports the general validity of the measure.
Toddlers and preschoolers represent a group that has been subject of little research to date. In addition, there has been only a limited number of studies analyzing SPEM in ASD. To check for a possible group difference without interactions a study with a larger sample size at fixed target velocity and target direction should follow.
Highlights
• Reduced evoked theta activity in the deaf.
• Reduced theta-gamma and alpha-gamma cross-frequency couplings in the deaf.
• Stronger delta-alpha coupling in the deaf.
Abstract
Neurons within a neuronal network can be grouped by bottom-up and top-down influences using synchrony in neuronal oscillations. This creates the representation of perceptual objects from sensory features. Oscillatory activity can be differentiated into stimulus-phase-locked (evoked) and non-phase-locked (induced). The former is mainly determined by sensory input, the latter by higher-level (cortical) processing. Effects of auditory deprivation on cortical oscillations have been studied in congenitally deaf cats (CDCs) using cochlear implant (CI) stimulation. CI-induced alpha, beta, and gamma activity were compromised in the auditory cortex of CDCs. Furthermore, top-down information flow between secondary and primary auditory areas in hearing cats, conveyed by induced alpha oscillations, was lost in CDCs. Here we used the matching pursuit algorithm to assess components of such oscillatory activity in local field potentials recorded in primary field A1. Additionally to the loss of induced alpha oscillations, we also found a loss of evoked theta activity in CDCs. The loss of theta and alpha activity in CDCs can be directly related to reduced high-frequency (gamma-band) activity due to cross-frequency coupling. Here we quantified such cross-frequency coupling in adult 1) hearing-experienced, acoustically stimulated cats (aHCs), 2) hearing-experienced cats following acute pharmacological deafening and subsequent CIs, thus in electrically stimulated cats (eHCs), and 3) electrically stimulated CDCs. We found significant cross-frequency coupling in all animal groups in > 70% of auditory-responsive sites. The predominant coupling in aHCs and eHCs was between theta/alpha phase and gamma power. In CDCs such coupling was lost and replaced by alpha oscillations coupling to delta/theta phase. Thus, alpha/theta oscillations synchronize high-frequency gamma activity only in hearing-experienced cats. The absence of induced alpha and theta oscillations contributes to the loss of induced gamma power in CDCs, thereby signifying impaired local network activity.
Dieser Arbeit lag die Fragestellung zugrunde, welchen Einfluss die jeweilige Transfusionsstrategie auf AML-Patienten unter intensiver Induktionschemotherapie hat.
Dafür wurde ein am Universitätsklinikum Frankfurt zwischen 2007 und 2018 behandeltes Kollektiv von 352 Patienten untersucht. So erfolgte hier bis ins Jahr 2015 hinein die Transfusion eines EK ab einem Hb-Wert <8g/dl und nach Änderung des Transfusionstriggers ab einem Hb <7g/dl. AML-Patienten aus dem Jahr 2015 – dem Jahr der Änderung der Transfusionsregel – wurden von weiterer Untersuchung ausgeschlossen, um zwei klar abgrenzbare Kohorten erhalten zu können.
Es zeigte sich, dass die weniger restriktive Transfusionskohorte unter Induktionschemotherapie einen durchschnittlich um 1g/dl höheren Hb-Wert aufwies und früher als die restriktive Kohorte transfundiert wurde. Die Anzahl an Fiebertagen, CRP-Werte, Aufenthalte auf Intensivstation sowie die Dauer des Krankenhausaufenthaltes betrachtend, zeigte sich hingegen kein signifikanter Unterscheid zwischen beiden Kohorten.
Basierend auf unserer Arbeit ergeben sich keine Hinweise dafür, dass die restriktive Transfusionspraxis einer weniger restriktiven für AML-Patienten unterlegen ist. Limitierend auf die Aussagekraft der Ergebnisse wirken sich dabei die retrospektive Natur der Arbeit sowie die zeitliche Verschiebung der Behandlungszeiträume beider Kohorten aus.
Ergebnisse der bislang ausstehenden randomisierten Studien, die den Einfluss unterschiedlicher Transfusionsregimes auf Patienten mit hämatologischen Krankheiten untersuchen, sind in Bälde zu erwarten. Die bereits vorliegenden Pilotstudien und Ergebnisse der TRIST-Studie decken sich mit der von uns beobachteten Nicht-Unterlegenheit der restriktiven Transfusionspraxis für ein hämatoonkologisches Patientenkollektiv, sodass es abzuwarten gilt, ob sich dies auch in weiteren größeren randomisierten und kontrollierten Studien beweisen kann.
The effect of race/ethnicity on cancer-specific mortality after salvage radical prostatectomy
(2022)
Background: To test the effect of race/ethnicity on cancer-specific mortality (CSM) after salvage radical prostatectomy (SRP).
Material and methods: We relied on the Surveillance, Epidemiology and End Results database (SEER, 2004–2016) to identify SRP patients of all race/ethnicity background. Univariate and multivariate Cox regression models addressed CSM according to race/ethnicity.
Results: Of 426 assessable SRP patients, Caucasians accounted for 299 (69.9%) vs. 68 (15.9%) African-Americans vs. 39 (9.1%) Hispanics vs. 20 (4.7%) Asians. At diagnosis, African-Americans (64 years) were younger than Caucasians (66 years), but not younger than Hispanics (66 years) and Asians (67 years). PSA at diagnosis was significantly higher in African-Americans (13.2 ng/ml), Hispanics (13.0 ng/ml), and Asians (12.2 ng/ml) than in Caucasians (7.8 ng/ml, p = 0.01). Moreover, the distribution of African-Americans (10.3%–36.6%) and Hispanics (0%–15.8%) varied according to SEER region. The 10-year CSM was 46.5% in African-Americans vs. 22.4% in Caucasians vs. 15.4% in Hispanics vs. 15.0% in Asians. After multivariate adjustment (for age, clinical T stage, lymph node dissection status), African-American race/ethnicity was an independent predictor of higher CSM (HR: 2.2, p < 0.01), but not Hispanic or Asian race/ethnicity. The independent effect of African-American race/ethnicity did not persist after further adjustment for PSA.
Conclusion: African-Americans treated with SRP are at higher risk of CSM than other racial/ethnic groups and also exhibited the highest baseline PSA. The independent effect of African-American race/ethnicity on higher CSM no longer applies after PSA adjustment since higher PSA represents a distinguishing feature in African-American patients.
Angesichts der Bedrohung durch den Klimawandel sind Maßnahmen zur Reduktion von Treibhausgasemissionen dringend notwendig. Obwohl auf den Gesundheitssektor 5 bis 10 % der nationalen Treibhausgasemissionen entfallen, spielt das Thema Nachhaltigkeit in deutschen Kliniken bisher nur eine untergeordnete Rolle. Studien der letzten Jahre haben gezeigt, dass die Nutzung von Mehrwegartikeln gegenüber der Nutzung von Einwegartikeln in der Anästhesiologie einen Vorteil in Bezug auf die CO2-Emissionen bieten kann. Gleichzeitig stehen Kliniken vor der Herausforderung, kosteneffizient zu handeln. In der vorliegenden Promotionsarbeit werden deshalb die CO2-Emissionen sowie die Kosten von Einweg-Beatmungsschlauchsystemen, Einweg-Beatmungsmasken und Einweg-Laryngoskopspateln im Zentral-OP des Universitätsklinikums Frankfurt pro Nutzung ermittelt und diese mit den Kosten sowie den CO2-Emissionen von entsprechenden Mehrweg-Alternativen pro Nutzung verglichen. Daraus soll eine Handlungsempfehlung für die künftige Verwendung von Mehrwegmaterial oder Einwegmaterial abgeleitet und ein Beitrag zur Nachhaltigkeit in der Anästhesiologie geleistet werden.
Methodisch wurde eine deskriptive Untersuchung umgesetzt. Die Daten wurden anhand von Informationen, die von den Produktherstellern, der Host Energie GmbH, der Abteilung Einkauf und den Mitarbeiterinnen und Mitarbeitern der Materialaufbereitung des Universitätsklinikums Frankfurt zur Verfügung gestellt wurden sowie durch eigene Erhebung gesammelt. Die Kosten pro Nutzung wurden anhand der realen Bezugspreise aus dem Jahr 2022 für die Einwegmaterialien bzw. der Angebote der Anbieter für die Mehrwegprodukte errechnet. Die Kosten der Entsorgung wurden gewichtsbezogen addiert. Für die Mehrwegartikel wurden zudem die Kosten der Aufbereitung berücksichtigt. Für die Kalkulationen der CO2-Emissionen wurden die Konversionsfaktoren des DEFRA aus Großbritannien verwendet, die bei bekanntem Produktgewicht eine näherungsweise Bestimmung der Treibhausgasemissionen der Materialproduktion, der Entsorgung und der Aufbereitung erlauben. Patientendaten wurden nicht verwendet, so dass weder ein Ethikvotum noch ein Datenschutzvotum erforderlich waren.
Die Ergebnisse zeigen, dass alle untersuchten Mehrwegartikel pro Nutzung günstiger sind als die äquivalenten Einwegartikel, wobei der Preisunterschied bei den Laryngoskopspateln am größten ist. Diese kosten als Einwegartikel 2,66 € pro Nutzung, die Mehrweg-Alternative 0,12 € pro Nutzung. Gleichzeitig sind die Treibhausgasemissionen pro Nutzung für alle untersuchten Mehrwegartikel niedriger als für die entsprechenden Einwegartikel. Der Unterschied ist hier ebenfalls bei den Laryngoskopspateln am größten. Ein Einweg-Laryngoskopspatel der Größe 4 generiert pro Nutzung 0,228 kg CO2-Äquivalent, wohingegen die Mehrweg-Alternative nur 0,093 kg CO2-Äquivalent verursacht.
Im Fazit ergibt sich dadurch, dass die Verwendung von Mehrweg-Beatmungsschlauchsystemen, Mehrweg-Beatmungsmasken und Mehrweg-Laryngoskopspateln für das Universitätsklinikum Frankfurt einen sowohl ökonomischen als auch ökologischen Vorteil gegenüber der Verwendung der Einwegartikel bietet. Die Umstellung zu Mehrwegartikeln in der Anästhesiologie hat somit nicht nur das Potenzial Kosten einzusparen, sondern auch den CO2-Fußabdruck im Gesundheitssektor zu senken.
A broad range of neuropsychiatric disorders are associated with alterations in macroscale brain circuitry and connectivity. Identifying consistent brain patterns underlying these disorders by means of structural and functional MRI has proven challenging, partly due to the vast number of tests required to examine the entire brain, which can lead to an increase in missed findings. In this study, we propose polyconnectomic score (PCS) as a metric designed to quantify the presence of disease-related brain connectivity signatures in connectomes. PCS summarizes evidence of brain patterns related to a phenotype across the entire landscape of brain connectivity into a subject-level score. We evaluated PCS across four brain disorders (autism spectrum disorder, schizophrenia, attention deficit hyperactivity disorder, and Alzheimer’s disease) and 14 studies encompassing ∼35,000 individuals. Our findings consistently show that patients exhibit significantly higher PCS compared to controls, with effect sizes that go beyond other single MRI metrics ([min, max]: Cohen’s d = [0.30, 0.87], AUC = [0.58, 0.73]). We further demonstrate that PCS serves as a valuable tool for stratifying individuals, for example within the psychosis continuum, distinguishing patients with schizophrenia from their first-degree relatives (d = 0.42, p = 4 x 10−3, FDR-corrected), and first-degree relatives from healthy controls (d = 0.34, p = 0.034, FDR-corrected). We also show that PCS is useful to uncover associations between brain connectivity patterns related to neuropsychiatric disorders and mental health, psychosocial factors, and body measurements.
Purpose: To evaluate intermediate and long-term visual outcomes and safety of a phakic intraocular posterior chamber lens with a central hole (ICL V4c) for myopic eyes.
Methods: Retrospective, consecutive case study of patients that uneventfully received a ICL V4c for myopia correction, with a 5-year postoperative follow-up. Department of Ophthalmology, Goethe University Frankfurt, Germany.
Results: From 241 eyes that underwent ICL implantation, we included 45 eyes with a mean age at surgery of 33 years ± 6 (18–48 years), with a 5 years follow-up. CDVA improved from 0.05logMAR ± 0.15 CDVA preoperatively to − 0.00 ± 0,07 at 5 years and did not change significantly from 3 to 5 years’ time (p = 0.266). The mean spherical equivalent (SE) improved from -10.13D ± 3.39 to − 0.45D ± 0.69. The change in endothelial cell count showed a mean decrease of 1.9% per year throughout the follow-up. Safety and efficacy index were 1.16 and 0.78, respectively. Cataract formation was seen in 2 of 241 eyes (0.8%), but in none of the 45 eyes that finished the 5-year follow-up.
Conclusions: Our data show a good intermediate and long-term stability, efficiency, and safety of ICL V4c phakic lenses in myopic eyes comparable to other known literature.
Die Appendizitis stellt mit einer Inzidenz von 115 pro 100000 Einwohnern in Deutschland eine der häufigsten Ursachen für ein akutes Abdomen dar. Bakterielle Infektionen sind ein wesentlicher Faktor für die postoperative Morbidität nach Appendektomie.
Ziel dieser prospektiven Studie war es, das Keimspektrum und insbesondere die Prävalenz resistenter Keime bei der akuten Appendizitis zu bestimmen und die Auswirkungen resistenter Keime auf das Auftreten infektiöser Komplikationen zu analysieren. Alle erwachsenen Patient*innen mit akuter Appendizitis, die zwischen April 2022 und Juli 2023 am Universitätsklinikum Frankfurt operativ behandelt wurden, wurden prospektiv eingeschlossen. Das Keimspektrum der Appendix und die Häufigkeit von MRE in Rektalabstrichen wurden analysiert. Die klinischen Daten wurden extrahiert, um die Korrelation des Keimspektrums mit dem Auftreten von postoperativen Komplikationen, Dauer und Art der Antibiotikatherapie und dem postoperativen Verlauf zu evaluieren. 30 Tage nach der Operation wurde ein Follow-up durchgeführt. Insgesamt wurden 105 Patient*innen in die Studie eingeschlossen.
In den Appendixabstrichen gelang ein Erregernachweis bei 67,6 % aller Fälle. Hierbei betrug die Prävalenz von Keimen mit Antibiotikaresistenz 43,8 %, Multipler-Antibiotikaresistenz (MAR) 27,6 % und bei 5,7 % der Fälle gelang ein MRE-Nachweis nach CDC im Appendixabstrich. Beim MRE-Screening konnten im Rektalabstrich bei 11,4 % der Patient*innen ein MRE nachgewiesen werden. In vier Fällen zeigte sich eine Übereinstimmung zwischen rektalen und appendikulären Abstrich, somit betrug die Sensitivität des MRE-Screenings für einen Nachweis multiresistenter Keime in der Appendix lediglich 33,3 % bei einer Spezifität von 86,7 %. In einer univariaten Analyse konnte das Vorliegen eines Diabetes mellitus als Risikofaktor für das Auftreten von Keimen mit Cefuroxim- Resistenz, Multipler-Antibiotikaresistenz (MAR) und MRE identifiziert werden.
Insgesamt erhielten 47,6 % aller Patient*innen postoperativ eine Antibiotikatherapie, von denen erfolgte bei 46 % eine Umstellung der empirischen Antibiose auf eine antibiogramm-gerechte Therapie nach Erhalt des mikrobiologischen Befundes. Insbesondere Patient*innen mit komplizierter Appendizitis erhielten postoperativ eine Antibiotikatherapie, wobei 28 % eine Antibiotikaeskalation benötigten.
Patient*innen, deren Appendixabstriche eine Resistenz gegen maximal ein Antibiotikum aufwiesen, wurden als nicht multiple Resistenz (Nicht-MAR) definiert und mit Patient*innen verglichen, deren Keime mit multipler Antibiotikaresistenz (MAR) waren. Die MAR-Gruppe zeigte im Vergleich zur Nicht-MAR-Gruppe eine höhere Inzidenz postoperativer Komplikationen, insbesondere eine erhöhte Inzidenz von Clavien-Dindo Grad 3 Komplikationen sowie von tiefen postoperativen Wundinfektionen (CDC Grad A3). Weiterhin benötigten Patient*innen der MAR-Gruppe häufiger eine postoperative Antibiotikatherapie und es erfolgte häufiger eine Eskalation der antibiotischen Therapie. Dies ging auch mit einem signifikant verlängerten Krankenhausaufenthalt einher.
Zusammenfassend kann festgestellt werden, dass eine bakterielle Infektion mit Multipler Antibiotikaresistenz bei der akuten Appendizitis häufig auftritt und die Morbidität nach Appendektomie beeinflusst. Die mikrobiologische Untersuchung mittels Appendixabstrich bei operativ behandelten Fällen von akuter komplizierter Appendizitis, die eine postoperative Antibiotikatherapie erfordern, könnte somit eine gezielte und kürzere Antibiotikatherapie ermöglichen. Dies könnte dazu beitragen, längere Krankenhausaufenthalte zu vermeiden, den unnötigen Einsatz unwirksamer Antibiotika zu reduzieren und die Kosten im Gesundheitswesen zu senken.
Polygene Risikoscores (PRS) integrieren zahlreiche Einzelnukleotid-Polymorphismen (SNP) von meist geringer Effektstärke, um Auskunft über das Erkrankungsrisiko bestimmter Krankheiten zu geben. In dieser Arbeit wurde der PRS zur genetisch generalisierten Epilepsie (GGE) von Leu et al. aus dem Jahr 2019 untersucht, um festzustellen, ob über das Erkrankungsrisiko hinaus noch Korrelationen mit weiteren phänotypischen Eigenschaften von Patienten bestehen. Der Nachweis solcher Zusammenhänge würde eine Prädiktionsfähigkeit des GGE-PRS demonstrieren, die perspektivisch ein Potential für dessen klinische Anwendbarkeit, beispielsweise im Sinne der personalisierten Medizin, aufzeigen könnte.
Die Identifizierung neuer Korrelationen sollte durch Vergleich der Phänotypen von zwei Gruppen von GGE-Patienten mit extrem hohen, beziehungsweise extrem niedrigen PRS-Werten erfolgen. Hierfür wurden von 2256 Patienten aus der Datenbank von Epi25, einem internationalen Forschungskollaborativ zur Erforschung der Relevanz genetischer Faktoren bei der Entwicklung von Epilepsie, die Patienten mit den höchsten (n=59) und den niedrigsten (n=49) GGE-PRS-Werten ausgewählt. Für diese 108 Patienten wurden retrospektive klinische Daten von den jeweiligen Behandlungszentren akquiriert. Hierzu wurde den Studienleitern der Zentren ein Questionnaire mit Fragen zu zahlreichen phänotypischen Parametern der Patienten übermittelt. Die Rücklaufrate war mit 54% gut.
Die so eingeholten Patientendaten wurden anschließend mittels Exaktem Test nach Fisher und Wilcoxon-Rangsummentest statistisch analysiert, um Unterschiede zwischen den Phänotypen beider Gruppen nachzuweisen. Im Falle der Pharmakoresistenz zeichneten sich hierbei zunächst signifikante Unterschiede ab, die ein selteneres Auftreten dieser Eigenschaft für Patienten mit hohen GGE-PRS-Werten implizierten. Diese Ergebnisse waren jedoch nach einer Bonferroni-Korrektur und bei Validierung in einer größeren Kohorte (n=825) nicht mehr signifikant. Für die anderen untersuchten Parameter waren ebenfalls keine signifikanten Unterschiede nachweisbar.
Das Ergebnis, dass für keinen der untersuchten Parameter signifikante Differenzen bestanden, obwohl zwei Kohorten mit extrem gegensätzlichen PRS-Werten untersucht wurden, spricht gegen eine Verwendung des aktuell verfügbaren GGE-PRS als prädiktiver Biomarker über das Erkrankungsrisiko hinaus und somit gegen dessen klinische Anwendbarkeit. Jedoch können die nicht-signifikanten Korrelationen im Falle der Pharmakoresistenz als Hinweis verstanden werden, dass im Bereich der Pharmakotherapie Zusammenhänge zwischen Score und Phänotyp bestehen könnten, die weiterer Untersuchungen in zukünftigen Studien bedürfen. Bei Verwendung eines verbesserten GGE-PRS mit zusätzlichen risikoassoziierten SNP und verfeinerter Wichtung der Effektstärken sowie größerer Kohorten könnten in diesem Bereich möglicherweise auch signifikante Zusammenhänge nachweisbar werden.
Background: Prostate cancer is a major health concern in aging men. Paralleling an aging society, prostate cancer prevalence increases emphasizing the need for efcient diagnostic algorithms.
Methods: Retrospectively, 106 prostate tissue samples from 48 patients (mean age,
66 ± 6.6 years) were included in the study. Patients sufered from prostate cancer (n = 38) or benign prostatic hyperplasia (n = 10) and were treated with radical prostatectomy or Holmium laser enucleation of the prostate, respectively. We constructed tissue microarrays (TMAs) comprising representative malignant (n = 38) and benign (n = 68) tissue cores. TMAs were processed to histological slides, stained, digitized and assessed for the applicability of machine learning strategies and open–source tools in diagnosis of prostate cancer. We applied the software QuPath to extract features for shape, stain intensity, and texture of TMA cores for three stainings, H&E, ERG, and PIN-4. Three machine learning algorithms, neural network (NN), support vector machines (SVM), and random forest (RF), were trained and cross-validated with 100 Monte Carlo random splits into 70% training set and 30% test set. We determined AUC values for single color channels, with and without optimization of hyperparameters by exhaustive grid search. We applied recursive feature elimination to feature sets of multiple color transforms.
Results: Mean AUC was above 0.80. PIN-4 stainings yielded higher AUC than H&E and
ERG. For PIN-4 with the color transform saturation, NN, RF, and SVM revealed AUC of 0.93 ± 0.04, 0.91 ± 0.06, and 0.92 ± 0.05, respectively. Optimization of hyperparameters improved the AUC only slightly by 0.01. For H&E, feature selection resulted in no increase of AUC but to an increase of 0.02–0.06 for ERG and PIN-4.
Conclusions: Automated pipelines may be able to discriminate with high accuracy between malignant and benign tissue. We found PIN-4 staining best suited for classifcation. Further bioinformatic analysis of larger data sets would be crucial to evaluate the reliability of automated classifcation methods for clinical practice and to evaluate potential discrimination of aggressiveness of cancer to pave the way to automatic precision medicine.
This prospective study sought to evaluate potential savings of radiation dose to medical staff using real-time dosimetry coupled with visual radiation dose feedback during angiographic interventions. For this purpose, we analyzed a total of 214 angiographic examinations that consisted of chemoembolizations and several other types of therapeutic interventions. The Unfors RaySafe i2 dosimeter was worn by the interventionalist at chest height over the lead protection. A total of 110 interventions were performed with real-time radiation dosimetry allowing the interventionalist to react upon higher x-ray exposure and 104 examinations served as the comparative group without real-time radiation monitoring. By using the real-time display during interventions, the overall mean operator radiation dose decreased from 3.67 (IQR, 0.95–23.01) to 2.36 μSv (IQR, 0.52–12.66) (−36%; p = 0.032) at simultaneously reduced operator exposure time by 4.5 min (p = 0.071). Dividing interventions into chemoembolizations and other types of therapeutic interventions, radiation dose decreased from 1.31 (IQR, 0.46-3.62) to 0.95 μSv (IQR, 0.53-3.11) and from 24.39 (IQR, 12.14-63.0) to 10.37 μSv (IQR, 0.85-36.84), respectively, using live-screen dosimetry (p ≤ 0.005). Radiation dose reductions were also observed for the participating assistants, indicating that they could also benefit from real-time visual feedback dosimetry during interventions (−30%; p = 0.039). Integration of real-time dosimetry into clinical processes might be useful in reducing occupational radiation exposure time during angiographic interventions. The real-time visual feedback raised the awareness of interventionalists and their assistants to the potential danger of prolonged radiation exposure leading to the adoption of radiation-sparing practices. Therefore, it might create a safer environment for the medical staff by keeping the applied radiation exposure as low as possible.
The combination of histological and biomolecular analyses provides deep understanding of different biological processes and is of high interest for basic and applied research. However, the available analytical methods are still limited, especially when considering bone samples. This study compared different fixation media to identify a sufficient analytical method for the combination of histological, immuno-histological and biomolecular analyses of the same fixed, processed and paraffin embedded bone sample. Bone core biopsies of rats’ femurs were fixed in different media (RNAlater + formaldehyde (R + FFPE), methacarn (MFPE) or formaldehyde (FFPE)) for 1 week prior to decalcification by EDTA and further histological processing and paraffin embedding. Snap freezing (unfixed frozen tissue, UFT) and incubation in RNAlater were used as additional controls. After gaining the paraffin sections for histological and immunohistological analysis, the samples were deparaffined and RNA was isolated by a modified TRIZOL protocol. Subsequently, gene expression was evaluated using RT-qPCR. Comparable histo-morphological and immuno-histological results were evident in all paraffin embedded samples of MFPE, FFPE and R + FFPE. The isolated RNA in the group of MFPE showed a high concentration and high purity, which was comparable to the UFT and RNAlater groups. However, in the groups of FFPE and R + FFPE, the RNA quality and quantity were statistically significantly lower when compared to MFPE, UFT and RNAlater. RT-qPCR results showed a comparable outcome in the group of MFPE and UFT, whereas the groups of FFPE and R + FFPE did not result in a correctly amplified gene product. Sample fixation by means of methacarn is of high interest for clinical samples to allow a combination of histological, immunohistological and biomolecular analysis. The implementation of such evaluation method in clinical research may allow a deeper understanding of the processes of bone formation and regeneration.
Hepatic cells are sensitive to internal and external signals. Ethanol is one of the oldest and most widely used drugs in the world. The focus on the mechanistic engine of the alcohol-induced injury has been in the liver, which is responsible for the pathways of alcohol metabolism. Ethanol undergoes a phase I type of reaction, mainly catalyzed by the cytoplasmic enzyme, alcohol dehydrogenase (ADH), and by the microsomal ethanol-oxidizing system (MEOS). Reactive oxygen species (ROS) generated by cytochrome (CYP) 2E1 activity and MEOS contribute to ethanol-induced toxicity. We aimed to: (1) Describe the cellular, pathophysiological and clinical effects of alcohol misuse on the liver; (2) Select the biomarkers and analytical methods utilized by the clinical laboratory to assess alcohol exposure; (3) Provide therapeutic ideas to prevent/reduce alcohol-induced liver injury; (4) Provide up-to-date knowledge regarding the Corona virus and its affect on the liver; (5) Link rare diseases with alcohol consumption. The current review contributes to risk identification of patients with alcoholic, as well as non-alcoholic, liver disease and metabolic syndrome. Additional prevalence of ethnic, genetic, and viral vulnerabilities are presented.
Mitochondrial RNA granules (MRGs) are membraneless, highly specialized compartments that play an essential role in the post-transcriptional regulation of mitochondrial gene expression. This regulation is crucial for maintaining energy production, controlling metabolic functions and ensuring homeostasis in cells. Dysregulation of mitochondrial genes has been linked to various human diseases, including neurodegenerative and metabolic disorders as well as certain types of cancer.
MRGs are composed of different RNA species, including mitochondrial precursor RNA (pre-RNA), mature tRNAs, rRNAs and mRNAs complexed with multiple proteins involved in RNA processing and mitoribosome assembly. However, despite the significance of MRGs, their protein composition, structural organization, stability and dynamics during stress conditions remain elusive. In the study reported here, I adopted a three-step approach to address the aforementioned fundamental issues.
First and foremost, I identified the protein composition of MRGs and unveiled their architectural complexity. To characterize the MRG proteome, I applied the cutting-edge TurboID-based proximity labeling approach combined with quantitative mass spectrometry. Proximity labeling was conducted on 20 distinct MRG-associated human proteins, resulting in the identification of more than 1,700 protein-protein interactions. This expansive dataset enabled me to create a comprehensive network, providing valuable insights into both the (sub)architecture as well as the core structure of MRGs in-depth.
Secondly, I investigated the spatio-temporal dynamics of MRGs under various mitochondrial stress conditions. To monitor the morphological alterations and compositional changes of MRGs, I utilized time-resolved confocal fluorescence microscopy and proteomics, respectively. In this analysis, I applied IMT1, the first specific inhibitor that selectively targets mitochondrial transcription. Using this methodology, I pinpointed precise conditions that triggered MRGs’ disassembly during stress, followed by their reassembly when nascent RNA production was restored. The results of this examination elucidate that MRGs are highly dynamic and stress adaptive structures, capable of rapid dissolution and reassembly, a process closely connected to mitochondrial transcription.
Thirdly, I aimed to explore the impact of RNA turnover on MRGs’ integrity during stress, employing confocal fluorescence microscopy and quantitative real-time PCR. I observed that depletion of MRG proteins associated with RNA degradation counteracts MRGs’ disassembly under stress conditions, a phenomenon attributed to the accumulation of double-stranded RNA (dsRNA). These results emphasize the critical role of pre-RNA turnover in maintaining MRG integrity and reveal that MRGs can be stabilized by dsRNA.
Taken together, the comprehensive investigation reported in this thesis has substantially broadened and deepened our understanding of MRGs’ complexity. By identifying their molecular structure and dynamics, I have gained significant insights into the fundamental characteristics and biological functions of MRGs in cellular processes. This knowledge contributes to the identification of disease-related pathways linked to mitochondrial gene expression and may inspire future studies to develop novel therapeutic approaches.
Aim
To compare overall mortality (OM), cancer-specific mortality (CSM), and other cause mortality (OCM) rates between radical prostatectomy (RP) versus radiotherapy (RT) in clinical node-positive (cN1) prostate cancer (PCa).
Materials and Methods
Within Surveillance, Epidemiology, End Results (SEER) (2004–2016), we identified 4685 cN1 PCa patients, of whom 3589 (76.6%) versus 1096 (24.4%) were treated with RP versus RT. After 1:1 propensity score matching (PSM), Kaplan–Meier plots and Cox regression models tested the effect of RP versus RT on OM, while cumulative incidence plots and competing-risks regression (CRR) models addressed CSM and OCM between RP and RT patients. All analyses were repeated after the inverse probability of treatment weighting (IPTW). For CSM and OCM analyses, the propensity score was used as a covariate in the regression model.
Results
Overall, RT patients were older, harbored higher prostate-specific antigen values, higher clinical T and higher Gleason grade groups. PSM resulted in two equally sized groups of 894 RP versus 894 RT patients. After PSM, 5-year OM, CSM, and OCM rates were, respectively, 15.4% versus 25%, 9.3% versus 17%, and 6.1% versus 8% for RP versus RT (all p < 0.001) and yielded respective multivariate hazard ratios (HRs) of 0.63 (0.52–0.78, p < 0.001), 0.66 (0.52–0.86, p < 0.001), 0.71 (0.5–1.0, p = 0.05), all favoring RP. After IPTW, Cox regression models yielded HR of 0.55 (95% confidence interval [CI] = 0.46–0.66) for OM, and CRR yielded HRs of 0.49 (0.34–0.70) and 0.54 (0.36–0.79) for, respectively, CSM and OCM, all favoring RP (all p < 0.001).
Conclusions
RP may hold a CSM advantage over RT in cN1 PCa patients.
Research in social insects has shown that hydrocarbons on their cuticle are species-specific. This has also been proven for Diptera and is a promising tool for identifying important fly taxa in Forensic Entomology. Sometimes the empty puparia, in which the metamorphosis to the adult fly has taken place, can be the most useful entomological evidence at the crime scene. However, so far, they are used with little profit in criminal investigations due to the difficulties of reliably discriminate among different species. We analysed the CHC chemical profiles of empty puparia from seven forensically important blow flies Calliphora vicina, Chrysomya albiceps, Lucilia caesar, Lucilia sericata, Lucilia silvarum, Protophormia terraenovae, Phormia regina and the flesh fly Sarcophaga caerulescens. The aim was to use their profiles for identification but also investigate geographical differences by comparing profiles of the same species (here: C. vicina and L. sericata) from different regions. The cuticular hydrocarbons were extracted with hexane and analysed using gas chromatography-mass spectrometry. Our results reveal distinguishing differences within the cuticular hydrocarbon profiles allowing for identification of all analysed species. There were also differences shown in the profiles of C. vicina from Germany, Spain, Norway and England, indicating that geographical locations can be determined from this chemical analysis. Differences in L. sericata, sampled from England and two locations in Germany, were less pronounced, but there was even some indication that it may be possible to distinguish populations within Germany that are about 70 km apart from one another.
With the introduction of the virtual allocation crossmatch in the Eurotransplant (ET) region in 2023, the determination of unacceptable antigen mismatches (UAM) in kidney transplant recipients is of utmost importance for histocompatibility laboratories and transplant centers. Therefore, a joined working group of members from the German Society for Immunogenetics (Deutsche Gesellschaft für Immungenetik, DGI) and the German Transplantation Society (Deutsche Transplantationsgesellschaft, DTG) revised and updated the previous recommendations from 2015 in light of recently published evidence. Like in the previous version, a wide range of topics is covered from technical issues to clinical risk factors. This review summarizes the evidence about the prognostic value of contemporary methods for HLA antibody detection and identification, as well as the impact of UAM on waiting time, on which these recommendations are based. As no clear criteria could be determined to differentiate potentially harmful from harmless HLA antibodies, the general recommendation is to assign all HLA against which plausible antibodies are found as UAM. There is, however, a need for individualized solutions for highly immunized patients. These revised recommendations provide a list of aspects that need to be considered when assigning UAM to enable a fair and comprehensible procedure and to harmonize risk stratification prior to kidney transplantation between transplant centers.
Inflammation is a crucial host defense mechanism activated in response to injury or infection. Its primary goal is to eliminate the source of the disturbance, repair the damaged tissue, and restore homeostasis. Inflammatory processes can be recognized through increased blood flow, higher vascular permeability, and the recruitment of leukocytes and plasma proteins to the tissue. A pathogen-induced inflammation triggers various pro- and anti-inflammatory processes. Local tissue cells and Toll-like receptors call upon innate immune cells like neutrophils, dendritic cells (DCs), and monocytes to respond to the intruder. They move across the endothelium and respond to local signals by releasing mediators or cytotoxic compounds, phagocytosing, or polarizing. To study local pathogen-induced inflammation, a zymosan-induced inflammation model was used in the hind paws of mice, which caused a Toll-like receptor 2 mediated inflammation. Multi-Epitope-Ligand-Cartography (MELC) was used for multiple sequential immunohistochemistry with 40 different antibodies on the same tissue. Bioinformatic analysis and graphical representation revealed a specific inflammatory architecture consisting of three major areas based on macrophage polarization and their cellular neighborhoods: a core region containing the pathogen, a pro-inflammatory region containing M1-like macrophages, and a region containing anti-inflammatory cells. This discovery highlights the coexistence of pro- and antiinflammatory processes during an ongoing inflammation and challenges the concept of a gradual temporal transition from pro- to anti-inflammation. Flow cytometry of the whole paw was performed to support and refine the MELC results. Eosinophils were used as a specific immune cell population to investigate their role in the inflammatory structure. They were found to be present in all three inflammatory regions, adapting their cytokine profile according to their localization. Depleting eosinophils reduced Interleukin 4 (IL-4)- levels, increased edema formation, and mechanical and thermal hypersensitivities during inflammation resolution. In the absence of eosinophils, pro- and anti-inflammatory region could not be determined in the inflammatory architecture, neutrophil numbers increased, and efferocytosis and M2-macrophage polarization were reduced. IL-4 administration restored these regions, normalized neutrophil numbers, efferocytosis, M2-macrophage polarization, and resolution of zymosan-induced hypersensitivity. The results show that eosinophils expressing IL-4 support the resolution of inflammation by enabling the development of an anti-inflammatory framework that encloses pro-inflammatory regions.
In Deutschland leidet ca. jeder zehnte Mensch über 40 Jahren an einer chronischen Einschränkung seiner Nierenfunktion. Nicht wenige davon sind im Laufe der Erkrankung auf eine Nierenersatztherapie angewiesen. Die Ursachen für eine Nierenschädigung sind vielfältig. Als neuartiger und vielversprechender Therapieansatz werden aktuell Mesenchymale Stamm-/Stromazellen (MSC) als Therapeutikum für diverse Nierenerkrankungen getestet. Erste Ergebnisse klinischer Phase-I-Studien zeigen, dass MSC sicher als Immunsuppressivum nach Nierentransplantation angewendet werden können. Auch für weitere Erkrankungen der Niere sind erste klinische Studien am Laufen. MSC gelten als regenerativ, immunsupprimierend und antientzündlich. Dennoch gibt es noch einige Limitationen. Nach der Transplantation der Zellen ist das Wachstum der Zellen oft eingeschränkt und es kommt zur vermehrten Apoptose. Auch wird immer wieder ein paradoxes und entzündungsförderndes Verhalten der MSC am Wirkort beobachtet. Ein wichtiger Lösungsansatz ist eine in vitro Vorbehandlung der MSC zur Modulierung der zellulären Eigenschaften. In dieser Arbeit wurden drei Substanzen und Arzneimittel auf ihre Fähigkeit untersucht, die entzündungshemmenden Eigenschaften der MSC zu verbessern und die entzündungsfördernden zu unterdrücken. Der Fokus lag hierbei auf dem Arzneimittel Niclosamid und den beiden bisher noch nicht zugelassenen Substanzen Berberin und Gedunin, die alle in vitro und in vivo bereits erste vielversprechende antientzündliche Wirkungen bewiesen haben. Für diese Arbeit wurden MSC aus Fettgewebe isoliert (ASC) und mit LPS oder einem Cytokin-Mix (Mischung aus TNF-α, IFN-γ und IL-1β) sowie den drei Substanzen stimuliert. Untersucht wurden im Anschluss die mRNA-Expressionen der gängigsten proinflammatorischen (TNF-α, IL-6, TLR-4, ICAM-1, HLA-DR) und antiinflammatorischen Marker (IDO, IL-10), sowie mittels ELISA die Protein-Freisetzung von IL-6 und IL-8. Die vielversprechendsten Ergebnisse ließen sich durch Berberin hervorrufen. Hier zeigte sich eine deutliche Senkung der IL-8-Konzentration im ELISA. Die Anwendung des Gedunin hatte keine signifikante Wirkung auf die ASC. Niclosamid hingegen scheint widererwarten sogar entzündungsfördernd zu wirken, in dem es die IL-6-, ICAM-1-mRNA-Expression steigerte und die IDO-mRNA-Expression absenkte. Unter den drei getesteten Subtanzen hat Berberin die beste Wirkung bewiesen. Nach weiterer Testung könnte eine Anwendung mit Berberin als in vitro Präkonditionierung von MSC vielversprechend sein. Die Verwendung von Niclosamid hingegen sollte vermieden werden, die Wirkung von Gedunin müsste genauer untersucht werden.
Einleitung: Allergisches Asthma bronchiale ist eine chronische Atemwegserkrankung, deren Prävalenz zunimmt. Angesichts der immensen gesellschaftlichen und individuellen Belastung durch Asthma ist es dringend erforderlich, neue Strategien zur Behandlung der Krankheit zu entwickeln. Immunologisch ist allergisches Asthma durch ein Ungleichgewicht zwischen TH2-Zellen und TH1-Zellen gekennzeichnet, das durch regulatorische T-Zellen (Tregs) reguliert wird. Tregalizumab ist ein monoklonaler IgG-Antikörper, der Tregs selektiv aktiviert. Ziel der vorliegenden Arbeit war es daher, die Wirkung von Tregalizumab auf die allergeninduzierte allergische Entzündung bei Patienten mit Hausstaubmilbenallergie anhand eines bronchialen Provokationsmodells zu untersuchen.
Methoden: In einer prospektiven, randomisierten, doppelblinden und placebokontrollierten Studie wurden 42 Probanden mit allergischem Asthma und Hausstaubmilbenallergie zwölf Wochen lang mit Tregalizumab 100 mg oder Placebo behandelt. Bronchiale Provokation mit HSM wurde vor (V4) und nach (V17) Tregalizumab-Gabe durchgeführt. Induziertes Sputum (Visite V5, V16, V18) und peripheres Blut (Visite V4, V5, V18) wurden entnommen und Zelldifferenzierung, Zytokine und Transkriptionsfaktoren wurden durch Mikroskopie, Durchflusszytometrie bzw. RT-PCR bewertet.
Ergebnisse: Sowohl in der Verum- als auch in der Placebogruppe zeigte sich zwischen Visite V5 (24 Stunden nach Provokation) und vier Wochen nach Provokation bei Visite V16 (p<0,05) ein signifikanter Rückgang des Anteils eosinophiler Granulozyten (wie auch des ECP-Levels). Interessanterweise konnte bei V18 (24 Stunden nach Provokation) nur in der Placebogruppe ein signifikanter Anstieg beobachtet werden (p<0,01). Die Konzentration des TH-2-Zytokins IL-5 nahm zwischen V5 und V16 in der Verumgruppe signifikant ab (p<0,05). Zwischen V16 und V18 konnte wiederum nur in der Placebogruppe ein signifikanter Anstieg festgestellt werden (p<0,01). Dieser spätere Effekt wurde auch auf Protein- und Transkriptionsebene und im peripheren Blut sowie bei der Expression des Transkriptionsfaktors FoxP3 gefunden. Auf der Ebene der TH-1-Zytokine konnten keine signifikanten Veränderungen festgestellt werden.
Diskussion: Der Anteil eosinophiler Granulozyten, die Konzentration von IL-5 in Blut und Sputum sowie die Konzentration von ECP im Sputum haben sich als gute Parameter zur Beurteilung der Entzündungsreaktion bei unseren Studienteilnehmern erwiesen. Wir haben gezeigt, dass allergische Entzündungen, die durch das Provokationsmodell verursacht wurden, durch die analysierten Parameter im Sputum, aber auch im Blut gut überwacht werden konnten. Ein klinischer Effekt von Tregalizumab konnte in dieser Studie jedoch nicht festgestellt werden und dieses Ergebnis stimmt gut mit der Analyse der Entzündungsparameter im induzierten Sputum überein.
Das Schilddrüsenkarzinom (SK) ist die häufigste bösartige endokrine Tumorerkrankung. Während das nicht-metastasierte und nicht-mutierte papilläre Schilddrüsenkarzinom (PSK) und das follikuläre Schilddrüsenkarzinom (FSK) eine gute Heilungschance aufweisen, zeigen die mutierten und metastasierten Varianten des PSK und FSK sowie das anaplastische Schilddrüsenkarzinom (ASK) weiterhin eine schlechte Prognose. Die Entwicklung von Therapieresistenzen stellen hierbei ein Hauptproblem in der Behandlung des fortgeschrittenen Schilddrüsenkarzinoms dar.
In den letzten Jahren wurden in Studien zunehmend Tumor-initiierende Zellen (TIZ) beschrieben, welche eine kleine Subpopulation von Zellen mit der Fähigkeit zur Selbsterneuerung, Tumorinitiierung und Entwicklung von Therapieresistenzen von Tumoren darstellen. Die Existenz von TIZ wurde auch im SK nachgewiesen. Ein entscheidender Faktor für die Persistenz von TIZ ist die Hypoxie, welche über eine Veränderung des Tumormikromilieus und des Zellmetabolismus zur Entstehung von Therapieresistenzen beiträgt. Ein durch Hypoxie hochreguliertes Enzym ist die Carboanhydrase IX (CAIX). CAIX wird hauptsächlich von Tumorzellen exprimiert und katalysiert die Reaktion von Kohlendioxid zu Bicarbonat und einem Proton und trägt damit zur Säurepufferung der Tumorzelle bei. CAIX stellt somit einen entscheidenden Faktor für das Überleben von Tumorzellen in einem hypoxischen Milieu dar. Des Weiteren ist eine erhöhte Expression von CAIX mit einem schlechten Patienten-Outcome assoziiert, wie z.B. im Brustkrebs. Diese Eigenschaften machen CAIX zu einem attraktiven Angriffspunkt einer zielgerichteten Tumortherapie. Die vorliegende Studie hat zum Ziel, die Expression von CAIX sowie dessen biologische Rolle im Schilddrüsenkarzinom näher zu untersuchen.
Hierzu wurden Proben von 114 SK-Patienten immunhistochemisch auf eine CAIX-Expression untersucht und mit tumorfreiem Schilddrüsengewebe verglichen. Hierbei waren unterschiedliche SK-Subtypen vertreten. Für eine weitere Validierung der Expressionsdaten erfolgte die Auswertung eines Datasets von „The Cancer Genome Atlas“ (TCGA) mithilfe von cBioportal. Da die Hypoxie ein wichtiger Faktor für die Persistenz von TIZ ist, wurde die CAIX-Expression in Tumorsphären, ein in vitro Nachweis von TIZ-Aktivität, mittels der Durchflusszytometrie bestimmt und mit der CAIX-Expression von Monolayern verglichen. Als SK-Zelllinien wurden BCPAP (PSK), FTC 133 (FSK) und 8505 C (ASK) verwendet. Anschließend wurde mithilfe der Polymerasekettenreaktion und Immunofluoreszenzfärbung untersucht, ob eine CAIX-Expression in den Tumorsphären mit der Expression von bereits bekannten Stammzellmarkern, u.a. NANOG, assoziiert ist. Die Unterschiede der CAIX-Expression, nach Inkubation der Monolayer jeweils in Normoxie und Hypoxie, wurden mittels Durchflusszytometrie bestimmt. Mithilfe eines genetischen CAIX-Knockdowns sowie einer pharmakologischen Inhibition mit dem CAIX-Inhibitor Methazolamid (MZM) wurde die Tumorzellproliferation und -Sphärenbildung unter Normoxie und Hypoxie bestimmt. Zusätzlich wurde der Einfluss von MZM auf die Apoptose und den Zellzyklus untersucht.
Immunhistochemische Färbungen der Gewebeproben von SK-Patienten zeigten, dass die CAIX-Expression sowohl im PSK und FSK als auch im ASK im Vergleich zum tumorfreien Schilddrüsengewebe erhöht war. Des Weiteren zeigte die klinisch-pathologische Datenanalyse, dass eine erhöhte CAIX-Expression mit dem Auftreten von Lymphknotenmetastasen im differenzierten SK assoziiert war. Auch die Analyse des TCGA-Datasets bestätigte, dass eine erhöhte Expression der CAIX-mRNA mit einem fortgeschrittenen Tumorstadium, Fernmetastasen und mit einem kürzeren Gesamt-Überleben von SK-Patienten korrelierte. Die weiteren funktionellen in vitro Untersuchungen ergaben, dass die CAIX-Expression in den Tumorsphären im Vergleich zu Monolayern erhöht und mit einer erhöhten Expression von Stammzellmarkern assoziiert war. Ein genetischer CAIX-Knockdown und eine CAIX-Inhibition mit MZM führten über eine Induktion der Apoptose und eines Zellzyklusarrests zu einer verminderten Tumorzellproliferation und Sphärenbildung.
Zusammenfassend deuten die Ergebnisse darauf hin, dass CAIX ein vielversprechendes Zielmolekül für eine gezielte Tumortherapie des fortgeschrittenen SK ist. Um diese Hypothese bestätigen zu können, sind jedoch weitere prospektive Analysen von Patientenproben sowie funktionelle in vivo Untersuchungen am SK nötig.
Einleitung: Die Zentrale Notaufnahme (ZNA) stellt eine Schnittstelle zwischen prä- und innerklinischer Versorgung dar. Das Spektrum der Krankheitsbilder erstreckt sich über jegliche Fachrichtungen und variiert von harmlosen Banalitäten bis zu akuten Notfällen. Eine sichere und suffiziente Primärversorgung ist die Basis eines qualitativ-hochwertigen Gesundheitssystems.2 Verspätete oder falsche Diagnosen in der ZNA sind mit 10-30 % keine Seltenheit.
Dies ist nicht nur für den individuellen Patienten belastend, es bedeutet auch einen zusätzlichen Ressourcenverbrauch und eine finanzielle Belastung für das Gesundheitssystem. Clinical Decision Support Systems (CDSS) haben das Potenzial, sowohl professionelle Anwender als auch Laien bei ihrer Diagnosefindung zu unterstützen. Fragestellung: Ziel der Arbeit ist es herauszufinden, welchen Einfluss der Diagnosezeitpunkt auf das Outcome von Patienten mit Abdominalschmerzen in der ZNA hat und inwiefern ein CDSS das Potenzial hat, die genannten Punkte zu beeinflussen.
Methoden: Es handelte sich um eine prospektive, doppelt verblindete Beobachtungsstudie. Patienten, die sich mit Abdominalschmerzen in der Notaufnahme vorstellten, gaben ihre Symptome in die Ada-App ein. Sowohl die Diagnosevorschläge der App als auch die Verdachtsdiagnosen des behandelnden Arztes wurden dokumentiert und verglichen. Weitere erhobene Parameter waren die Verwendung von apparativer Diagnostik, die vergangene Zeit bis zur endgültigen Diagnosestellung, das Auftreten von Komplikationen, die Komorbidität und Mortalität sowie die Länge des Krankenhausaufenthalts. Das Follow-Up erfolgte zu verschiedenen Zeitpunkten bis zu Tag 90. Für die Analyse wurden die 450 Patienten anhand des Zeitpunkts ihrer Diagnosestellung in Gruppen "früh" (Tag 0) und "spät" (Tag 1-24) eingeteilt.
Ergebnisse: Im Vergleich zur „frühen“ Gruppe, hatte die Gruppe der „spät“ diagnostizierten Patienten einen höheren Anteil von Männern (45.2% (n=168/372) versus 60.3 % (n=47/78); p=0.018), im Schnitt einen höheren Charlson Comorbidity Index (0.7 versus 1.1; p=0.045) und im Schnitt einen höheren RAI-C Score (8.06 versus 9.9; p<0.001) am Tag ihrer Vorstellung. Bei den „spät“ diagnostizierten blieben weniger Patienten komplikationsfrei (57.0 % 49 (n=212/372) versus 17.9% (n=14/78); p<0.001), es traten mehr Major-Komplikationen auf (8.9% (n=33/372) versus 17.9% (n=14/78); p=0.024), analog dazu war der Comprehensive Complication Index höher (13.1 versus 25.6; p<0.001) und sie verweilten länger im Krankenhaus (2.6 Tage versus 6.7 Tage; p<0.001). Zudem nahmen sie signifikant mehr apparative Diagnostik in Anspruch.
Die behandelnden Ärzte konnten in 82.6% der Fälle (n=372/450) am Tag der Vorstellung die korrekte Diagnose stellen. Die Ada-App konnte in insgesamt 52% der Fälle (n=234/450) die korrekte Diagnose unter ihren Diagnoseverschlägen nennen.
Schlussfolgerung: Multimorbide Patienten scheinen anfälliger zu sein für falsche und verspätete Diagnosen. Ein später Diagnosezeitpunkt korreliert mit der vermehrten Nutzung apparativer Diagnostik, einem komplikationsreicheren Verlauf, einer höheren Komorbidität und einem längeren Krankenhausaufenthalt.
Die Ada-App ist den Ärzten zwar unterlegen, dennoch ist Potenzial vorhanden.
Für Ärzte kann die Ada-App eine Unterstützung im Rahmen der Diagnosefindung darstellen. Neben der Ressourcenentlastung kann sie vor Fehlannahmen und frühzeitigen Schlussfolgerungen schützen und auf weitere mögliche Differentialdiagnosen hinweisen. Die Ada-App stellt für Laien mit Sicherheit eine Weiterentwicklung gegenüber der simplen Symptomsuche über das Internet dar, dennoch sollten weitere Studien den Nutzen und die Sicherheit der App überprüfen.
Weltweit gibt es laut WHO ca. 58 Millionen Menschen mit einer chronischen Hepatitis-C-Virus (HCV) Infektion und jährlich stecken sich ca. 1,5 Millionen Menschen neu mit diesem Virus an (Stand 2019). Da die Folge einer chronischen Hepatitis-C-Virus Infektion eine potenziell tödlich verlaufende Leberzirrhose oder die Entwicklung eines Hepatozellulären Karzinoms sein können, ist eine frühe Diagnose und eine adäquate Therapie eine wichtige Aufgabe in der Medizin.
Die bisherige Therapie erfolgte mittels pegyliertem Interferon und Ribavirin und seit einigen Jahren auch interferonfrei mittels Direkter Antiviraler Agenzien (DAA). Vor allem beim älteren Therapieregime konnten viele Nebenwirkungen und häufiger auch ein Therapieversagen auftreten, sodass ein leicht zu gewinnender Biomarker nützlich wäre, der die Patienten mit Therapieversagen frühzeitig und im besten Fall sogar vor Therapiebeginn detektieren kann.
In der vorliegenden Arbeit wurden die Spiegel von extrazellulär im Blut zirkulierender, leberspezifischer microRNA miR-122 auf Eigenschaften als solche potenzielle Biomarker untersucht. Dazu wurden die Patientenseren von insgesamt 60 Patienten mit chronischer Hepatitis-C-Virus Infektion analysiert, die mittels pegyliertem Interferon und Ribavirin behandelt wurden. Vor, während und nach der Therapie wurden verschiedene Laborparameter sowie die miR 122 in den Patientenseren bestimmt. 20 dieser Patienten zeigten ein dauerhaftes Ansprechen auf die Therapie (sustained virological response = SVR), 20 zeigten nach einem initialen Therapieansprechen ein Rückfall der Erkrankung (Relapse) und 20 Patienten sprachen gar nicht auf die Therapie an (Non-Responder = NR).
Zunächst wurden die sogenannten Baseline-Charakteristika der Patienten vor Therapiebeginn untersucht. Dabei konnten wir jedoch keinen Unterschied zwischen den Patientengruppen hinsichtlich der Alanin-Aminotransferase (ALT) und Aspartat-Aminotransferase (AST), zwei Laborparameter zur Bestimmung einer Leberschädigung, sowie der HCV-RNA, ein Parameter zur Bestimmung der Viruslast bei Patienten mit einer HCV-Infektion, feststellen.
Auch die miR-122-Spiegel zeigten vor Therapiebeginn keinen signifikanten Unterschied zwischen den drei Patientengruppen. Daraus wurde geschlossen, dass man die miR-122 vor Therapiebeginn nicht als prognostischen Marker für einen Therapieerfolg verwenden kann.
Beim Vergleich der miR-122-Spiegel mit den Laborparametern konnte eine signifikante Korrelation zwischen der miR-122 und der ALT, AST und der Gamma-Glutamyl-Transferase (GGT) festgestellt werden. Die miR-122 scheint somit ähnlich wie die anderen Laborparameter eine Leberzellschädigung widerzuspiegeln.
Nach dem Therapiebeginn konnte bereits ab Woche 4 ein signifikanter Unterschied zwischen den SVR und Non-Respondern sowie zwischen den Relapsepatienten und den Non-Respondern festgestellt werden. Jedoch war der Unterschied zwischen den SVR und den Relapse-Patienten nicht signifikant, sodass man weiterhin keine Unterscheidung dieser beiden Patientengruppen machen konnte.
Auch die ALT- und HCV-RNA-Spiegel zeigten einen ähnlichen Verlauf. In den Gruppen der SVR und Relapse-Patienten zeigte sich im Laufe der Therapie ein Rückgang der Parameter wohingegen die Gruppe der Non-Responder keine signifikante Dynamik aufwies.
Zum Schluss wurden die miR-122-Spiegel 12 bzw. 24 Wochen nach Therapieende bestimmt, dem sogenannten Zeitpunkt des Follow-Up bei dem der Therapieerfolg laut Leitlinie mit Hilfe der HCV-RNA-Messung bestimmt wird. Dabei konnte ein signifikanter Unterschied zwischen den miR-122-Spiegeln bei den SVR-Patienten und den anderen beiden Patientengruppen festgestellt werden.
In Zusammenschau dieser Ergebnisse kann man sagen, dass die miR-122 gut geeignet ist um ähnlich wie die HCV-RNA den Therapieverlauf widerzuspiegeln. Als prognostischer Parameter bzw. Biomarker für ein Therapieansprechen ist sie jedoch nicht geeignet, da keine Unterscheidung zwischen den einzelnen Patientengruppen vor Therapiebeginn möglich ist und während der Therapie lediglich die Non-Responder und nicht die Relapse-Patienten detektiert werden können.
Im Fokus der vorliegenden Arbeit stand die Fragestellung, inwieweit ORF10 von B. recurrentis, dem Erreger des Läuserückfallfiebers, mit verschiedenen Komplementkomponenten interagieren kann.
Mit funktionellen Komplementtests konnte gezeigt werden, dass ORF10 den klassischen, den alternativen sowie den Lektin-Weg inhibiert, wobei sich die stärkste Inhibition gegenüber dem alternativen Weg manifestierte. Darüber hinaus ließ sich in einem Zell-basierten Hämolyse-Assay eine Inhibition des terminalen Komplementweges durch ORF10 nachweisen.
Die durchgeführten Bindungsanalysen mit verschiedenen Komplementkomponenten führten zu dem Ergebnis, dass ORF10 mit C1q, C1s, C3, C3b, C4b und C5 interagiert und diese Protein-Protein-Interaktion mit den Komplementkomponenten C1q, C3, C3b und C4b durch einen dosisabhängigen Verlauf charakterisiert ist. Eine Bindung von C1r, C2, C4, FB, FH sowie FI konnte jedoch nicht nachgewiesen werden.
Auf Basis der modellierten Struktur von ORF10 wurden mithilfe der In-vitro-Mutagenese drei verschiedene Varianten generiert, die jedoch nicht affinitätschromatographisch aus E. coli-Zelllysaten isoliert werden konnten und deshalb nicht für weiterführende funktionelle Analysen zur Verfügung standen.
Die Ergebnisse der Serumbakterizidie-Tests mit einem „gain of function“-Borrelienstamm, welcher ORF10 heterolog produzieren sollte, ergaben, dass keine erhöhte Resistenz gegenüber Humanserum nachgewiesen werden konnte. Inwieweit ORF10 bei der intrinsischen Serumresistenz von B. recurrentis beteiligt ist, lässt sich abschließend nicht vollumfänglich erklären.
Background: Survival data regarding cytoreductive nephrectomy (CN) in metastatic renal cell carcinoma (mRCC) patients according to the type and extent of tumor-associated vascular thrombus are scarce.
Objective: To test for survival differences in mRCC patients treated with CN according to the type and extent of tumor-associated vascular thrombus.
Design, setting, and participants: Within Surveillance, Epidemiology, and End Results Research Plus (2004–2017), we identified CN mRCC patients with renal vein (pT3a-TT) versus infradiaphragmatic inferior vena cava (IVC; pT3b) versus supradiaphragmatic IVC tumor thrombus/IVC invasion (pT3c).
Outcome measurements and statistical analysis: Overall survival (OS) was addressed in Kaplan-Meier and Cox regression analyses, in addition to 3-mo landmark analyses.
Results and limitations: Of 2170 mRCC patients, 1880 (87%), 204 (9%), and 86 (4%) harbored pT3a-TT, pT3b, and pT3c, respectively. The respective median OS periods were 21, 23, and 12 mo (p < 0.001). In multivariable Cox regression models, pT3c stage, but not pT3b stage, was an independent predictor of higher overall mortality (hazard ratio [HR]: 1.37; 95% confidence interval [CI]: 1.09–1.73; p = 0.007), as well as in 6-mo landmark analyses (HR: 1.36; 95% CI: 1.02–1.80; p = 0.04). In the sensitivity analysis, relying on all pT3a patients, the predictor status of pT3c stage remained unchanged (HR: 1.37; 95% CI: 1.09–1.71; p = 0.007). Limitations have to be addressed regarding the sample size and the retrospective design of the current study.
Conclusions: Although overall mortality is significantly higher in pT3c mRCC patients than in their pT3b and pT3a-TT counterparts, these individuals may still expect 12-mo or better OS after CN versus virtually 2-yr OS in their pT3a and pT3b counterparts.
Patient summary: In this study, we looked at the survival outcomes of metastatic renal cell carcinoma patients who presented with tumor thrombus at cytoreductive nephrectomy. Even though these patients with most advanced tumor thrombus stage demonstrated lower survival rates, the median overall survival was still 1 yr.
Middle-aged persons with multimorbidity have to take their illnesses into account in their daily work, family and leisure activities. The MuMiA project aims to identify early preventive measures that make it easier for those between 30 and 60 years of age with multiple chronic diseases to manage their illnesses in their everyday lives. An interdisciplinary workshop and interviews with multimorbid middle-aged adults and their principal healthcare providers will be used to collect information on the management of care in the contexts of patients’ daily work, family and leisure activities. Data obtained in the interviews will be coded inductively and analysed using content analysis. Workshop outputs will be transcribed and evaluated by the authors. This study has received ethical approval from the Faculty of Medicine Ethics Committee of Goethe University (2021-47). The project will generate prevention recommendations that reflect the experiences of middle-aged persons living with multimorbidity and the views of their principal healthcare providers. The findings will be disseminated via conferences and peer-reviewed publications.
Development of a multidimensional pain questionnaire in professional dance (MPQDA): a pilot study
(2022)
Background: Pain is part of the everyday life of professional dancers. It can indicate health risks and impair the ability to work. Suitable screening tools can be used to identify pain and its risk potential. A comprehensive, multidimensional, differentiated assessment tool for pain in professional dance does not currently exist.
Methods: An initial questionnaire was developed in German and English and was assessed in a qualitative pretest. In a field study with a cross-sectional design including n = 72 dancers from Germany (n = 36 responses each in the English and German language versions), the questionnaire was optimized by item analysis, its psychometric properties (dimensionality, construct validity, reliability) were examined and the ability of the pain dimensions to classify the subjective ability to work in training was analyzed (ROC analysis).
Results: The developed Multidimensional Pain Questionnaire in Professional Dance (MPQDA) was reduced and optimized in its psychometric properties. Following questions were reduced in their items or answer categories: pain localizations (from 20 to 15 regions), accompanying symptoms (from 6 to 3 items), sensory and affective pain quality (from 20 to 10 items), pain frequency (from 4 to 3 answer categories), and the motives of working with pain (from 14 to 12 items). Regarding the subjective ability to work in training, the variables of the ability to work in rehearsals and in performances, as well as the accompanying symptoms of tension and mobility restrictions, showed a relatively good classification ability (Area under the Curve (AUC) ≥ 0.7 in the 95% confidence interval) and significant, moderate to strong correlations (Somers' D > 0.25, p < 0.05). The classification ability of the other pain dimensions was largely absent or poor.
Conclusion: The MPQDA differentiates various pain dimensions in professional dancers and is available in a compatible manner in German and English. The clinical relevance needs to be explored further in the future.
Up to the present, there has been a lack of studies on the skin health of professional and recreational dancers. Dancers are at risk of skin diseases due to contact with allergenic or irritating substances and working in humid environments. The aim of the present study was, therefore, to examine skin health in two different dance styles and training periods. Methods: Physical dermatological examination of professional dancers (PD; n = 35) and Latin American formation dancers (LD; n = 79) after a 4-week period of recovery (T0) and a period of high training or work load (T1). Results: PD are significantly more frequently affected by skin dermatoses than LD (T0, p = 0.004) (frontal traction alopecia, hair loss, facial seborrhoea, xerosis cutis of the trunk and extremities, and facial folliculitis). The following significant differences between the sexes were observed in the LD: more folliculitis of the trunk in male subjects (T0 and T1, p = 0.009), more frequent xerosis cutis of the extremities (p < 0.001) and perioral dermatitis in female subjects (T1, p = 0.043). Subjects with skin lesions trained more frequently, performed more times per year, and had longer dance experience. Discussion: Based on the findings, preventive measures for skin protection (especially informing dancers about skin health) are necessary. At the same time, further studies on this topic are important.
The deep fascia is intimately linked to skeletal muscle and may be involved in delayed onset muscle soreness (DOMS). The present study therefore explored the effect of eccentric exercise on fascia stiffness and its relation with DOMS. Healthy active male adults (n = 19, 27 ± 4 years) performed 6 x 10 maximal eccentric knee flexions using an isokinetic dynamometer. Before (baseline) as well as immediately (T0), 1 hour (T1), and each day up to 72 hours (T24 to T72) afterwards, shear wave elastography was used to measure the mechanical stiffness of the biceps femoris muscle and the overlying fascia. As a surrogate of DOMS, pain upon palpation was captured by means of a 100mm visual analogue scale. While muscle stiffness remained unchanged (p > 0.05), deep fascia stiffness increased from baseline to T24 (median: 18 kPa to 21.12 kPa, p = 0.017) and T72 (median: 18 kPa to 21.3 kPa, p = 0.001) post-exercise. Linear regression showed an association of stiffness changes at T24 and pressure pain at T72 (r2 = 0.22, p < 0.05). Maximal eccentric exercise leads to a stiffening of the fascia, which, in turn, is related to the magnitude of future DOMS. Upcoming research should therefore gauge the effectiveness of interventions modifying the mechanical properties of the connective tissue in order to accelerate recovery.
Background: Primary viral myocarditis associated with severe acute respiratory syndrome coronavirus 2 (SARS-Cov2) infection is a rare diagnosis.
Case presentation: We report the case of an unvaccinated, healthy patient with cardiogenic shock in the context of a COVID-19-associated myocarditis and therapy with simultaneous veno-arterial extracorporeal membrane oxygenation (VA-ECMO) and percutaneous left ventricular decompression therapy with an Impella. The aim of this review is to provide an overview of therapeutic options for patients with COVID-19-associated myocarditis.
Conclusions: The majority of patients required a combination of two assist devices to achieve sufficient cardiac output until recovery of left ventricular ejection fraction. Due to the rapid onset of this fulminant cardiogenic shock immediate invasive bridging therapy in a specialized center was lifesaving.
Introduction: Studies of vocational ballet students are sparce. In particular, there is a lack of gender comparisons. The aim of the present study, therefore, was to give a musculoskeletal and sociodemographic description of the typical vocational ballet student in gender comparison. Methods: In this study, n = 414 female and n = 192 male students of the John Cranko School (JCS), aged between 5 and 22 years (Mean ± SD: 13.9 ± 3.5), were examined by an experienced orthopedist and dance physician. Results: Males started ballet (5.8/8.2 years, p < 0.001) and training at later age than females (13.5/14.6 years, p < 0.05). There was a high prevalence of low body weight among both sexes; however, particularly among female participants (58.4/16.2%, p < 0.001). Both sexes showed a large external rotation of the hip (f/m: 59/62°, p < 0.001), a large turnout (f/m: 82/86°, p < 0.01), high values for plantarflexion of the ankle joint (f/m: 72/68°, p < 0.001) and dorsiflexion of the metatarsophalangeal joint of the big toe (f/m: 90/87°, p < 0.001). Discussion: Differences in ballet-specific characteristics between genders (f/m) are converging and are smaller than described in the past. The particularly high prevalence of low body weight among students in the vocational training sector, particularly among females, highlights the need for deeper diagnostic investigation.
Structural brain morphometry as classifier and predictor of ADHD and reward-related comorbidities
(2022)
Attention deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders, and around two-thirds of affected children report persisting problems in adulthood. This negative trajectory is associated with high comorbidity with disorders like obesity, depression, or substance use disorder (SUD). Decreases in cortical volume and thickness have also been reported in depression, SUD, and obesity, but it is unclear whether structural brain alterations represent unique disorder-specific profiles. A transdiagnostic exploration of ADHD and typical comorbid disorders could help to understand whether specific morphometric brain changes are due to ADHD or, alternatively, to the comorbid disorders. In the current study, we studied the brain morphometry of 136 subjects with ADHD with and without comorbid depression, SUD, and obesity to test whether there are unique or common brain alterations. We employed a machine-learning-algorithm trained to classify subjects with ADHD in the large ENIGMA-ADHD dataset and used it to predict the diagnostic status of subjects with ADHD and/or comorbidities. The parcellation analysis demonstrated decreased cortical thickness in medial prefrontal areas that was associated with presence of any comorbidity. However, these results did not survive correction for multiple comparisons. Similarly, the machine learning analysis indicated that the predictive algorithm grouped most of our ADHD participants as belonging to the ADHD-group, but no systematic differences between comorbidity status came up. In sum, neither a classical comparison of segmented structural brain metrics nor an ML model based on the ADHD ENIGMA data differentiate between ADHD with and without comorbidities. As the ML model is based in part on adolescent brains, this might indicate that comorbid disorders and their brain changes are not captured by the ML model because it represents a different developmental brain trajectory.
Objectives: The range of motion (ROM) of the cervical spine and postural stability are important for an economical and motorically adequate adaptation of the body to any situation. Therefore, this study aims to analyze whether these two components of postural and movement control can be influenced by means of a splint in a centric position compared to habitual occlusion.
Methods: 38 recreational male athletes volunteered. Cervical spine ROM was recorded using an ultrasound system and the a pressure measuring plate for postural stability (length of center of pressure (CoP) movement, area of CoP). The two dental occlusion conditions employed were the habitual occlusion and wearing a splint in an idealized, condylar position close to the centric position. Level of significance was set at ρ ≤ 0.05.
Results: The cervical spine mobility increased significantly by wearing the splint regarding rotation to the left (+3.9%) and right (+2.7%) and lateral flexion to the left (+4.4%) and right (+6.7%). Wearing the splint reduced the area of sway deflections by about 31.5% in the bipedal stance and by about 2.4% (left) and 28.2% (right) in the unipedal stance. The CoP trace was reduced in the sagittal plane by approximately 8.2% in the right single-leg stance.
Conclusions: The major findings seem to demonstrate that wearing a splint that keeps the jaw close to the centric relation may increase the cervical ROM and may improve balance stability in male recreational athletes. Changing the jaw relation in athletes can possibly aid the release of performance potentials by improving coordination skills.
Background: In order to determine possible pathological deviations in body weight distribution and body sway, it is helpful to have reference values for comparison: gender and age are two main influencing factors. For this reason, it was the aim of the present study to present reference values for women between 51 and 60 years of age.
Methods: For this study, 101 subjectively healthy female Germans aged between 51 and 60 years (55.16 ± 2.89 years) volunteered and were required to stand in a habitual posture on a pressure measuring platform.
Results: The average BMI of this age group was 25.02 ± 4.55 kg/m². The left and right foot showed an almost evenly balanced load distribution with a median load of 52.33% on the left foot [tolerance interval (TR) 38.00%/68.03%; confidence interval (CI) 51.00%/53.33%] and 47.67% on the right foot [TR 31.97%/62.00%; CI 46.67%/49.00%]. The measured median load of the forefoot was 33.33% [TR 21.37%/54.60%; CI 30.67%/36.00%] and that of the rear foot was 66.67% [TR 45.50%/78.63%; CI 64.00%/69.33%]. The median body sway in the frontal plane was 11 mm [TR 5.70 mm/26.30 mm; CI 10.00 mm/11.67 mm] and that of the sagittal plane was 16 mm [TR 7.37 mm/34.32 mm; CI 14.67 mm/18.67 mm]. The median ellipse area was 1.17 cm² [TR 0.29 cm²/4.96 cm²; CI 0.98 cm²/1.35 cm²], the median ellipse width was 0.91 cm [TR 0.42 cm/1.9 cm; CI 0.84 cm/1.02 cm] and its height was 0.40 cm [TR 0.22 cm/0.89 cm; CI 0.38 cm/0.43 cm].
Conclusions: The left-to-right ratio is almost balanced. The load distribution of the forefoot to the rear foot is approximately 1:2. The median body sway values for the frontal and sagittal planes (11 and 16 mm, respectively) agree with other values. The values for the height, body weight and the BMI are comparable to the values of average German women at this age; therefore, the measured values show a presentable cross section of women in the 51–60 age group in Germany. The present data can be used as a basis for women aged 51–60 years and can support the detection of possible dysfunctions as well as injury prevention in the parameters of postural control.
Background: In the COVID-19 pandemic, numerous researchers postponed their patient and public involvement (PPI) activities. This was mainly due to assumptions on patients’ willingness and skills to participate digitally. In fact, digital PPI workshops differ from in-person meetings as some forms of non-verbal cues and body language may be missing and technical barriers may exist. Within our project HYPERION-TransCare we adapted our PPI workshop series for intervention development to a digital format and assessed whether these digital workshops were feasible for patients, health care professionals and researchers.
Methods: We used a digital meeting tool that included communication via audio, video and chat. Discussions were documented simultaneously on a digital white board. Technical support was provided via phone and chat during the workshops and with a technical introduction workshop in advance. The workshop evaluation encompassed observation protocols, participants’ feedback via chat after each workshop on their chance to speak and the usability of the digital tools, and telephone interviews on patients’ and health professionals’ experiences after the end of the workshop series.
Results: Observation protocols showed an active role of moderators in verbally encouraging every participant to get involved. Technical challenges occurred, but were in most cases immediately addressed and solved. Participants median rating of their chance to speak and the usability of the digital tool was “very good”. In the evaluation interviews participants reported a change of perspective and mutual understanding as a main benefit from the PPI workshops and described the atmosphere as inclusive and on equal footing. Benefits of the digital format such as overcoming geographical distance, saving time and combining workshop participation with professional or childcare obligations were reported. Technical support was stressed as a pre-condition for getting actively involved in digital PPI.
Conclusions: Digital formats using different didactic and documentation techniques, accompanied by technical support, can foster active patient and public involvement. The advantages of digital PPI formats such as geographical flexibility and saving time for participants as well as the opportunity to prepare and hold workshops in geographically stretched research teams persists beyond the pandemic and may in some cases outweigh the advantages of in-person communication.
Although, during the past decades, substantial advances emerged in identifying major local and systemic factors contributing to initiation and progression of osteoarthritis (OA), some neuroendocrine mechanisms are still not understood or even neglected when thinking about novel therapeutic options. One of which is the sympathetic nervous system that exhibits various OA-promoting effects in different tissues of the joint. Interestingly, the β2-adrenoceptor (AR) mediates the majority of these effects as demonstrated by several in vitro, in vivo as well as in clinical studies. This review article does not only summarize studies of the past two decades demonstrating that the β2-AR plays an OA-promoting role in different tissues of the joint but also aims to encourage the reader to think about next-level research to discover novel and innovative preventive and/or therapeutic strategies targeting the β2-AR in OA.
Das Hepatoblastom ist ein embryonaler Lebertumor, dessen Zellen unterschiedliche unreife Stadien aufweisen. Aufgrund dieser Unreife ist die Identifizierung von Krebsstammzellen erschwert, die in diesem Tumor vermutet und für Rückfälle verantwortlich gemacht werden. In Vorarbeiten konnte eine Krebsstammzellpopulation mit der Kombination der hämatopoetischen Stammzellmarker CD90 und CD34 sowie dem „oval cell“ OV-6-Antikörper in den etablierten Hepatoblastomzelllinien HuH6 und HepG2 detektiert werden. Diese CD34+OV-6+CD90+ Zellen wiesen eine erhöhte Expression von Pluripotenzfaktoren auf und zeichneten sich durch ein erhöhtes Migrationsverhalten aus.
In der hier vorgelegten Arbeit wurden zunächst Tumor-Sphäroid-Assays durchgeführt um diese Population als Krebsstammzellen zu bestätigen, da nur Krebsstammzellen unter den gegebenen Umständen wachsen können. Diese waren im Anschluss wieder in der Lage, in „normalem Medium“ zu differenzieren. Des Weiteren wurden die Zelllinien mit dem Standardtherapeutikum Cisplatin behandelt. Da Krebsstammzellen als chemoresistent gelten, konnte in der überlebenden Zellpopulation auch eine Anreicherung der CD34+OV-6+CD90+ Zellen beobachtet werden. Zusätzlich ließ sich eine weitere CD34+OV-6+CD90+ Population identifizieren, deren Expression aller drei Marker schwächer war und die bei steigenden Cisplatin-Konzentrationen den Großteil der CD34+OV-6+CD90+ Population ausmachte.
Neben den erhöhten Transkriptmengen der Pluripotenzmarker Oct4 und Nanog zeichneten sich die CD34+OV-6+CD90+ Krebsstammzellen durch eine verstärkte Expression der aktivierungsinduzierten Zytidin-Desaminase AID aus. AID wirkt induzierend auf die Transkription beider Pluripotenzmarker. Daher könnte es auch bei Krebsstammzellen eine Rolle bei der Induktion von Pluripotenz und bei ihrer langfristigen Erhaltung spielen. Dies unterstützend legten die verminderten Transkriptmengen der Pluripotenzgene nach einem AID siRNA Knock-Down eine Abhängigkeit des Stammzellcharakters von diesem Faktor nahe. Um einen Effekt von Therapeutika, die inhibitorisch auf AID wirken, auf Krebsstammzellen zu untersuchen, wurden die Zellen mit den DNMT-Inhibitoren Decitabine und Zebularine sowie dem HSP90-Inhibitor Tanespimycin behandelt. Tatsächlich konnte vor allem in den HuH6-Zellen ein verminderter Anteil der Krebsstammzellpopulation durch die drei Substanzen beobachtet werden. Wurden die Zellen im Anschluss mit dem Standardzytostatikum Cisplatin behandelt, führte allerdings eine Vorbehandlung mit Zebularine oder Decitabine zu einer starken Anreicherung von Krebsstammzellen. Dies war vor allem auf Zellen mit dem schwach positiven CD34+OV-6+CD90+ Expressionsprofil zurückzuführen, die chemo-induziert zu sein scheinen. Zwar erscheint die Mehrheit der Tumorzellen eliminiert zu werden, jedoch lassen diese Ergebnisse die Entstehung von chemo-induzierten Krebsstammzellen vermuten, die langfristig für einen Rückfall verantwortlich sein könnten. Daher ist von einer Ergänzung der Therapie mit diesen Substanzen abzusehen. Eine Vorbehandlung mit Tanespimycin hingegen konnte im Vergleich zur alleinigen Cisplatin-Behandlung wirksam den Anteil der Krebsstammzellen reduzieren. Interessanterweise war dies nicht auf einen verstärkten Zelltod der Krebsstammzellen, sondern vielmehr auf eine durch Tanespimycin bewirkte Differenzierung derselben zurückzuführen. Diese spiegelte sich auch in einer verminderten Expression von Pluripotenzmarkern auf mRNA-Ebene im Vergleich zur alleinigen Cisplatin-Behandlung wider.
Somit präsentierte sich Tanespimycin als potenter Inhibitor von Krebsstammzellen. Auch wenn weitere vorklinische und klinische Tests und Untersuchungen erfolgen müssen, stellt Tanespimycin bzw. die Substanzklasse der HSP90-Inhibitoren einen interessanten und vielversprechenden Kandidaten für eine Ergänzung der Standardtherapie vor allem bei behandlungsresistenten und rekurrenten High-Risk-Hepatoblastomen dar.
Inflammation is a regulated reaction of the body to control a threat such as infection or injury. An efficient resolution of inflammation is critical to prevent the development of chronic inflammation and to restore tissue homeostasis. Macrophages (Mf) play a crucial role in the onset, but also in the resolution of inflammation, because they phagocytose and eliminate pathogens and tissue debris. Efficient efferocytosis, i.e. the engulfment of apoptotic cells, represents an important trigger for the onset of the resolution response and contributes to the pro-resolving reprogramming of Mf. Despite the importance of post- transcriptional modes of regulation during the resolution phase and translational control as a key node modulating gene expression in immune cells, relevant translational alterations remain largely elusive.
In the present study, I aimed to identify translationally regulated targets in inflammatory primary murine Mf upon resolution-promoting efferocytosis. To this end, I used total RNA-sequencing as well as de novo proteomics analyses to determine global transcriptional and translational changes. Sequencing data confirmed that efferocytosis induced a pro-resolution signature in inflammatory Mf and pointed towards translational regulation because the related integrated stress response was enriched upon efferocytosis. While changes of gene expression between efferocytic and non-efferocytic Mf appeared rather small at the transcriptional level, I observed considerable differences at the level of de novo synthesized proteins. This finding suggests a regulation at the level of translation. Furthermore, the tight connection between translational and metabolic changes was confirmed by enriched metabolism-associated terms of targets upregulated by efferocytosis at both RNA and de novo protein level. Interestingly, analysis of translationally regulated targets in response to inflammatory stimulation showed reduced translation for most targets, with only little impact of efferocytosis. Among those targets, I identified pro-resolving matrix metallopeptidase 12 (Mmp12) as a novel candidate, which showed translational repression during early inflammation and translational increase during the resolution phase. Noteworthy, a first indicator for a potential translation regulatory component of Mmp12 were the extremely high mRNA levels and not overly high de novo protein levels. Validation experiments recapitulated a slight elevation of Mmp12 mRNA expression and a significant downregulation of MMP12 intracellular protein levels in inflammatory Mf, as observed in the RNA-seq and de novo proteomics datasets. To investigate whether the discrepancy in mRNA and protein expression were due to changes in translation, I applied polysomal fractionation analysis to determine the translational status of Mmp12. Inflammatory Mf displayed a significantly lower relative Mmp12 mRNA abundance in the late polysomes compared to naïve Mf, suggesting reduced translational efficiency upon inflammatory stimulation. Consequently, extracellular MMP12 levels in the supernatant of inflammatory Mf decreased, although with a slight delay.
The functional impact of attenuated Mmp12 translation upon inflammatory stimulation was assessed in migration assays. While siRNA-mediated knockdown of Mmp12 did not alter Mf migration on uncoated plates, it increased migration 3-fold on matrigel/elastin-coated plates. Importantly, the increase in migrated distance driven by siMmp12 could be lowered by the addition of exogenous recombinant MMP12 protein. In line with reduced Mmp12 translation and MMP12 protein in inflammatory Mf, I observed a significant increase in cell migration on matrigel/elastin-coated plates, while it remained unaltered on uncoated plates. Consequently, Mf elastase MMP12 degrades elastin, thereby cell migration along elastin fibers is diminished. In inflammatory Mf, Mmp12 is translationally downregulated, thereby enhancing the migratory capacity.
In summary, the present study identifies a substantial contribution of translational regulation in the course of inflammation shown by high changes between inflammatory naïve and efferocytic Mf at the de novo proteomic level. Specifically, I was able to determine the translational regulation of pro-resolving Mmp12, which is repressed during early inflammation and recovers during the resolution phase. Functionally, translational control of MMP12 emerged as a strategy to alter the migratory properties of Mf, enabling enhanced, matrix- dependent migration of Mf during the early inflammatory phase, while restricting migration during the resolution phase.
Aryl hydrocarbon receptor-dependent and -independent pathways mediate curcumin anti-aging effects
(2022)
The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor whose activity can be modulated by polyphenols, such as curcumin. AhR and curcumin have evolutionarily conserved effects on aging. Here, we investigated whether and how the AhR mediates the anti-aging effects of curcumin across species. Using a combination of in vivo, in vitro, and in silico analyses, we demonstrated that curcumin has AhR-dependent or -independent effects in a context-specific manner. We found that in Caenorhabditis elegans, AhR mediates curcumin-induced lifespan extension, most likely through a ligand-independent inhibitory mechanism related to its antioxidant activity. Curcumin also showed AhR-independent anti-aging activities, such as protection against aggregation-prone proteins and oxidative stress in C. elegans and promotion of the migratory capacity of human primary endothelial cells. These AhR-independent effects are largely mediated by the Nrf2/SKN-1 pathway.
The pathophysiology of Takotsubo Syndrome (TTS) is not completely understood and the trigger of sudden cardiac death (SCD) in TTS is not clear either. We therefore sought to find an association between TTS and primary electrical diseases. A total of 148 TTS patients were analyzed between 2003 and 2017 in a bi-centric manner. Additionally, a literature review was performed. The patients were included in an ongoing retrospective cohort database. The coexistence of TTS and primary electrical diseases was confirmed in five cases as the following: catecholaminergic polymorphic ventricular tachycardia (CPVT, 18-year-old female) (n = 1), LQTS 1 (72-year-old female and 65-year-old female) (n = 2), LQTS 2 (17-year-old female) (n = 1), and LQTS in the absence of mutations (22-year-old female). Four patients suffered from malignant tachyarrhythmia and recurrent syncope after TTS. Except for the CPVT patient and one LQTS 1 patient, all other cases underwent subcutaneous ICD implantation. An event recorder of the CPVT patient after starting beta-blocker did not detect arrhythmias. The diagnosis of primary electrical disease was in 80% of cases unmasked on a TTS event. This diagnosis triggered a family clinical and genetic screening confirming the diagnosis of primary electrical disease. A subsequent literature review identified five cases as the following: a congenital atrioventricular block (n = 1), a Jervell and Lange-Nielsen Syndrome (n = 1), and a family LQTS in the absence of a mutation (n = 2), LQTS 2 (n = 1). A primary electrical disease should be suspected in young and old TTS patients with a family history of sudden cardiac death. In suspected cases, e.g., ongoing QT interval prolongation, despite recovery of left ventricular ejection fraction a family screening is recommended.
Test-Retest-Reliabilität der Präpulsinhibition (PPI) und PPI-Korrelation mit dem Arbeitsgedächtnis
(2023)
Sensomotorisches Gating – ein Mechanismus zur Filterung des sensorischen Inputs und zur Regulierung des motorischen Outputs – wird experimentell durch die Präpulsinhibition (PPI) der akustisch ausgelösten Schreckreaktion (ASR) operatio-nalisiert. Frühere Studien deuten auf eine hohe Test-Retest-Reliabilität der PPI und eine mögliche Korrelation mit dem Arbeitsgedächtnis (engl. Working Memory (WM)) hin. Ziel dieser Studie war es, die Test-Retest-Reliabilität der PPI bei ge-sunden Menschen und ihre Korrelation mit der Leistung des WM zu überprüfen. Hier wurde ein akustisches Schreckreiz-PPI-Paradigma mit vier verschiedenen Präpuls-Intensitäten (64, 68, 72 und 76 dB(A)) und zwei verschiedene WM-Aufgaben (n-back, Change-Detection-Task (CDT)) verwendet. Es konnte eine ho-he Retest-Reliabilität der PPI mit einer mittleren Intraklassenkorrelation (engl. In-traclass Correlation (ICC)) von >.80 und eine signifikante positive Korrelation der PPI mit der n-back-, aber nicht mit der CDT-Leistung bestätigt werden. Eine detail-lierte Analyse zeigte, dass die PPI über alle Präpulsintensitäten hinweg sowohl mit den 2-back- als auch mit den 0-back-Bedingungen signifikant korrelierte, was auf eine Regulation durch konditionsübergreifende Prozesse (z. B. Aufmerksamkeit) schließen lässt. Wird jedoch die 0-back-Komponente aus den 2-back-Daten aus-partialisiert, sind spezifische und signifikante Korrelationen mit der Arbeitsgedächt-nisleistung für die 76 dB(A) PPI-Bedingung zu finden. Mit der vorliegenden Studie konnte die hohe Test-Retest-Reliabilität der PPI beim Menschen bestätigt und die Korrelation mit der Arbeitsgedächtnisleistung validiert und erweitert werden.
Whereas the lack of biomarkers in penile cancer (PeCa) impedes the development of efficacious treatment protocols, preliminary evidence suggests that c-MET and associated signaling elements may be dysregulated in this disorder. In the following study, we investigated whether c-MET and associated key molecular elements may have prognostic and therapeutic utility in PeCa. Formalin-fixed, paraffin-embedded tumor tissue from therapy-naïve patients with invasive PeCa was used for tissue microarray (TMA) analysis. Immunohistochemical staining was performed to determine the expression of the proteins c-MET, PPARg, β-catenin, snail, survivin, and n-MYC. In total, 94 PeCa patients with available tumor tissue were included. The median age was 64.9 years. High-grade tumors were present in 23.4%, and high-risk HPV was detected in 25.5%. The median follow-up was 32.5 months. High expression of snail was associated with HPV-positive tumors. Expression of β-catenin was inversely associated with grading. In both univariate COX regression analysis and the log-rank test, an increased expression of PPARg and c-MET was predictive of inferior disease-specific survival (DSS). Moreover, in multivariate analysis, a higher expression of c-MET was independently associated with worse DSS. Blocking c-MET with cabozantinib and tivantinib induced a significant decrease in viability in the primary PeCa cell line UKF-PeC3 isolated from the tumor tissue as well as in cisplatin- and osimertinib-resistant sublines. Strikingly, a higher sensitivity to tivantinib could be detected in the latter, pointing to the promising option of utilizing this agent in the second-line treatment setting.