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PET probes targeting fibroblasts are frequently used for varying applications in oncology. In recent years, the clinical spectrum has been expanded towards cardiovascular medicine, e.g., after myocardial infarction, in aortic stenosis or as a non-invasive read-out of atherosclerosis. We herein provide a brief overview of the current status of this PET radiotracer in the context of cardiovascular disease, including translational and clinical evidence. In addition, we will also briefly discuss future applications, e.g., the use of fibroblast-targeting PET to investigate bilateral organ function along the cardiorenal axis.
Lifestyle factors—such as diet, physical activity (PA), smoking, and alcohol consumption—have a significant impact on mortality as well as healthcare costs. Moreover, they play a crucial role in the development of type 2 diabetes mellitus (DM2). There also seems to be a link between lifestyle behaviours and insulin resistance, which is often a precursor of DM2. This study uses an enhanced Healthy Living Index (HLI) integrating accelerometric data and an Ecological Momentary Assessment (EMA) to explore differences in lifestyle between insulin-sensitive (IS) and insulin-resistant (IR) individuals. Moreover, it explores the association between lifestyle behaviours and inflammation. Analysing data from 99 participants of the mPRIME study (57 women and 42 men; mean age 49.8 years), we calculated HLI scores—ranging from 0 to 4— based on adherence to specific low-risk lifestyle behaviours, including non-smoking, adhering to a healthy diet, maximally moderate alcohol consumption, and meeting World Health Organization (WHO) PA guidelines. Insulin sensitivity was assessed using a Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) and C-reactive protein (CRP) levels were used as a proxy for inflammation. Lifestyle behaviours, represented by HLI scores, were significantly different between IS and IR individuals (U = 1529.0; p = 0.023). The difference in the HLI score between IR and IS individuals was mainly driven by lower adherence to PA recommendations in the IR group. Moreover, reduced PA was linked to increased CRP levels in the IR group (r = −0.368, p = 0.014). Our findings suggest that enhancing PA, especially among individuals with impaired insulin resistance, holds significant promise as a preventive strategy.
• Mexican and German populations of L. sericata differ in their development times.
• Mexican L. sericata had a shorter development time at 20°C than German flies.
• At 30 °C, German L. sericata pupariated and eclosed earlier than the Mexican flies.
• Differences in study design make the comparison of developmental studies difficult.
Abstract
The cosmopolitan blow fly Lucilia sericata is often used in forensic case work for estimating the minimum postmortem interval (PMImin). For this, the age of immature specimens developing on the dead body is calculated by measuring the time taken to reach the sampled developmental stage at a given temperature. To test whether regional developmental data of L. sericata is valid on a global scale, the time taken to reach different developmental stages was compared between a population from Mexico and one from Germany at two different constant temperatures.
The German population of L. sericata was collected in Frankfurt/Main, while the Mexican population originated near Oaxaca de Juarez and was transported to Germany in the larval stage. Only the F1 generation was used to avoid adaption of the Mexican flies. Eggs were immediately placed at 20 °C and 30 °C. Five times 30 freshly eclosed larvae per replicate (n = 5) were then transferred to a cup of minced meat in separate containers. The larvae were checked every 8 h for migration, pupariation or emergence of adult flies. The time at which the first individual and 50 % of the specimens per container entered each of these stages, was recorded.
Significant differences in the time of development between the two populations were observed at both temperatures. At 20 °C, the first specimens of the Mexican population reached all developmental stages a little (< 1 day to < 2 days) earlier than the German L. sericata. At 30 °C, the Mexican flies also reached the post-feeding stage slightly earlier (0.2 days). However, at 30 °C, the German flies started pupariation significantly earlier (after 5 days) than the Mexican flies (6.9 days) and the adults from Germany also emerged earlier (10.5 days compared to 13.1 days). The same pattern was observed when looking at 50 % of the total number of specimens per container. A comparison with previously published developmental studies was difficult as the experimental design varied widely between studies. However, the results were within the range of most studies. Our study has shown that age estimation can vary widely depending on the population on which the reference data used for the calculations are based. This highlights the importance of using local and population-specific developmental data for estimating the age of blow flies in case work.
Highlights
• TAM polarization induces CP RNA.
• CP RNA expression is regulated by HIF-2 and STAT1.
• CP RNA is transferred from TAMs to HT1080 cells.
• CP RNA is translated by HT1080 cells and protects from ferroptosis.
• Co-cultured HT1080 cells decrease iron and lipid peroxidation.
Abstract
Solid tumors are characterized by hypoxic areas, which are prone for macrophage infiltration. Once infiltrated, macrophages polarize to tumor associated macrophages (TAM) to support tumor progression. Therefore, the crosstalk between TAMs and tumor cells is of current interest for the development of novel therapeutic strategies. These may comprise induction of an iron- and lipid peroxidation-dependent form of cell death, known as ferroptosis. To study the macrophage - tumor cell crosstalk we polarized primary human macrophages towards a TAM-like phenotype, co-cultured them with HT1080 fibrosarcoma cells, and analyzed the tumor cell response to ferroptosis induction. In TAMs the expression of ceruloplasmin mRNA increased, which was driven by hypoxia inducible factor 2 and signal transducer and activator of transcription 1. Subsequently, ceruloplasmin mRNA was transferred from TAMs to HT1080 cells via extracellular vesicles. In tumor cells, mRNA was translated into protein to protect HT1080 cells from RSL3-induced ferroptosis. Mechanistically this was based on reduced iron abundance and lipid peroxidation. Interestingly, in naïve macrophages also hypoxia induced ceruloplasmin under hypoxia and a co-culture of HT1080 cells with hypoxic macrophages recapitulated the protective effect observed in TAM co-cultures. In conclusion, TAMs provoke tumor cells to release iron and thereby protect them from lipid peroxidation/ferroptosis.
• Mexican and German populations of L. sericata differ in their development times.
• Mexican L. sericata had a shorter development time at 20°C than German flies.
• At 30 °C, German L. sericata pupariated and eclosed earlier than the Mexican flies.
• Differences in study design make the comparison of developmental studies difficult.
Abstract
The cosmopolitan blow fly Lucilia sericata is often used in forensic case work for estimating the minimum postmortem interval (PMImin). For this, the age of immature specimens developing on the dead body is calculated by measuring the time taken to reach the sampled developmental stage at a given temperature. To test whether regional developmental data of L. sericata is valid on a global scale, the time taken to reach different developmental stages was compared between a population from Mexico and one from Germany at two different constant temperatures.
The German population of L. sericata was collected in Frankfurt/Main, while the Mexican population originated near Oaxaca de Juarez and was transported to Germany in the larval stage. Only the F1 generation was used to avoid adaption of the Mexican flies. Eggs were immediately placed at 20 °C and 30 °C. Five times 30 freshly eclosed larvae per replicate (n = 5) were then transferred to a cup of minced meat in separate containers. The larvae were checked every 8 h for migration, pupariation or emergence of adult flies. The time at which the first individual and 50 % of the specimens per container entered each of these stages, was recorded.
Significant differences in the time of development between the two populations were observed at both temperatures. At 20 °C, the first specimens of the Mexican population reached all developmental stages a little (< 1 day to < 2 days) earlier than the German L. sericata. At 30 °C, the Mexican flies also reached the post-feeding stage slightly earlier (0.2 days). However, at 30 °C, the German flies started pupariation significantly earlier (after 5 days) than the Mexican flies (6.9 days) and the adults from Germany also emerged earlier (10.5 days compared to 13.1 days). The same pattern was observed when looking at 50 % of the total number of specimens per container. A comparison with previously published developmental studies was difficult as the experimental design varied widely between studies. However, the results were within the range of most studies. Our study has shown that age estimation can vary widely depending on the population on which the reference data used for the calculations are based. This highlights the importance of using local and population-specific developmental data for estimating the age of blow flies in case work.
Marjan van den Akker, Gesundheitswissenschaftlerin und Epidemiologin : Goethe, Deine Forscher
(2024)
Highlights
• NCoR1 is the most highly expressed endothelial corepressor.
• Loss of NCoR1 promotes angiogenic function in endothelial cells.
• Loss of NCoR1 promotes a tip cell position during angiogenic sprouting.
Abstract
Corepressors negatively regulate gene expression by chromatin compaction. Targeted regulation of gene expression could provide a means to control endothelial cell phenotype. We hypothesize that by targeting corepressor proteins, endothelial angiogenic function can be improved. To study this, the expression and function of nuclear corepressors in human umbilical vein endothelial cells (HUVEC) and in murine organ culture was studied. RNA-seq revealed that nuclear receptor corepressor 1 (NCoR1), silencing mediator of retinoid and thyroid hormone receptors (SMRT) and repressor element-1 silencing transcription factor (REST) are the highest expressed corepressors in HUVECs. Knockout and knockdown strategies demonstrated that the depletion of NCoR1 increased the angiogenic capacity of endothelial cells, whereas depletion of SMRT or REST did not. Interestingly, the effect was VEGF signaling independent. NCoR1 depletion significantly upregulated angiogenesis-associated genes, especially tip cell genes, including ESM1, DLL4 and NOTCH4, as observed by RNA- and ATAC-seq. Confrontation assays comparing cells with and without NCoR1-deficiency revealed that loss of NCoR1 promotes a tip-cell position during spheroid sprouting. Moreover, a proximity ligation assay identified NCoR1 as a direct binding partner of the Notch-signaling-related transcription factor RBPJk. Luciferase assays showed that siRNA-mediated knockdown of NCOR1 promotes RBPJk activity. Furthermore, NCoR1 depletion prompts upregulation of several elements in the Notch signaling cascade. Downregulation of NOTCH4, but not NOTCH1, prevented the positive effect of NCOR1 knockdown on spheroid outgrowth. Collectively, these data indicate that decreasing NCOR1 expression is an attractive approach to promote angiogenic function.
There has been a growing awareness of the need for scientific research to focus on somatic and mental comorbidities in recent years due to the emerging evidence showing their substantial overlap at numerous levels. In this special issue, initiated by members of the EU-funded PRIME consortium (“Prevention and Remediation of Insulin Multimorbidity in Europe; www.prime-study.eu), the focus is on the comorbidities of metabolic disturbances, especially related to insulin signalling dysregulation and mental and neurological disorders. Thus, while obesity, type 2 diabetes, and metabolic syndrome are commonly known to be insulin-related disorders, the last decades have shown that neurodegenerative disorders, such as Alzheimer’s disease, as well as neurodevelopment disorders, such as obsessive-compulsive disorder (OCD), autism spectrum disorders (ASDs) and attention deficit / hyperactivity disorder (ADHD) also fall into this category. The special issue draws together a series of basic and clinical review articles that describe the current knowledge and future perspectives regarding insulin comorbidities across a multidisciplinary group of experts
Beyond well-established difficulties with working memory in individuals with attention deficit hyperactivity disorder (ADHD), evidence is emerging that other memory processes may also be affected. We investigated, first, which memory processes show differences in adults and adolescents with ADHD in comparison to control participants, focusing on working and short-term memory, initial learning, interference, delayed and recognition memory. Second, we investigated whether ADHD severity, co-occurring depressive symptoms, IQ and physical fitness are associated with the memory performance in the individuals with ADHD.
We assessed 205 participants with ADHD (mean age 25.8 years, SD 7.99) and 50 control participants (mean age 21.1 years, SD 5.07) on cognitive tasks including the digit span forward (DSF) and backward (DSB), the Rey Auditory Verbal Learning Test (RAVLT), and the vocabulary and matrix reasoning subtests of the Wechsler Abbreviated Scale of Intelligence. Participants with ADHD were additionally assessed on ADHD severity, depression symptoms and cardiorespiratory fitness. A series of regressions were run, with sensitivity analyses performed when variables were skewed.
ADHD-control comparisons were significant for DSF, DSB, delayed and recognition memory, with people with ADHD performing less well than the control participants. The result for recognition memory was no longer significant in sensitivity analysis. Memory performance was not associated with greater ADHD or depression symptoms severity. IQ was positively associated with all memory variables except DSF. Cardiorespiratory fitness was negatively associated with the majority of RAVLT variables.
Individuals with ADHD showed difficulties with working memory, short-term memory and delayed memory, as well as a potential difficulty with recognition memory, despite preserved initial learning.
The ICH M13A draft bioequivalence guideline allows the exclusion of very low plasma profiles from the statistical evaluation in exceptional cases, i.e., if such phenomenon occurs due to non-compliance of subjects (not swallowing the product). Moreover, the draft ICH guideline requests additional bioequivalence studies for medicinal products with pH-dependent solubility after concomitant administration of gastric pH modifying preparations, e.g., proton pump inhibitors. Both regulations are scientifically sound, however, would need further specification. Main problem in this context is that compounds with very low solubility and slow intrinsic dissolution in the intestinal environment will cause significant bioavailability problems if their solid oral dosage forms are emptied from the stomach undisintegrated. Also very low plasma profiles may result under these circumstances. Such cases can occur accidentally and are not resultant of non-compliance. Thus, limitation for one case per study only as suggested in the guideline is not justified.
Background: Novel treatments are needed to control refractory status epilepticus (SE). This study aimed to assess the potential effectiveness of fenfluramine (FFA) as an acute treatment option for SE. We present a summary of clinical cases where oral FFA was used in SE.
Methods: A case of an adult patient with Lennox–Gastaut syndrome (LGS) who was treated with FFA due to refractory SE is presented in detail. To identify studies that evaluated the use of FFA in SE, we performed a systematic literature search.
Results: Four case reports on the acute treatment with FFA of SE in children and adults with Dravet syndrome (DS) and LGS were available. We report in detail a 30-year-old woman with LGS of structural etiology, who presented with generalized tonic and dialeptic seizures manifesting at high frequencies without a return to clinical baseline constituting the diagnosis of SE. Treatment with anti-seizure medications up to lacosamide 600 mg/d, brivaracetam 300 mg/d, valproate 1,600 mg/d, and various benzodiazepines did not resolve the SE. Due to ongoing refractory SE and following an unremarkable echocardiography, treatment was initiated with FFA, with an initial dose of 10 mg/d (0.22 mg/kg body weight [bw]) and fast up-titration to 26 mg/d (0.58 mg/kg bw) within 10 days. Subsequently, the patient experienced a resolution of SE within 4 days, accompanied by a notable improvement in clinical presentation and regaining her mobility, walking with the assistance of physiotherapists. In the three cases reported in the literature, DS patients with SE were treated with FFA, and a cessation of SE was observed within a few days. No treatment-emergent adverse events were observed during FFA treatment in any of the four cases.
Conclusions: Based on the reported cases, FFA might be a promising option for the acute treatment of SE in patients with DS and LGS. Observational data show a decreased SE frequency while on FFA, suggesting a potentially preventive role of FFA in these populations.
Key points
* We summarize four cases of refractory status epilepticus (SE) successfully treated with fenfluramine.
* Refractory SE resolved after 4–7 days on fenfluramine.
* Swift fenfluramine up-titration was well-tolerated during SE treatment.
* Treatment-emergent adverse events on fenfluramine were not observed.
* Fenfluramine might be a valuable acute treatment option for SE in Dravet and Lennox–Gastaut syndromes.
Highlights
• Artificial intelligence systems for mechanically ventilated patients are increasing.
• The clinical and financial impact of these models are often unexamined.
• We developed a generic health-economic model for artificial intelligence systems.
• This model assesses the cost-effectiveness for many different scenarios.
• The developed framework is easily adjustable to other (clinical) situations.
Abstract
Purpose: The health and economic consequences of artificial intelligence (AI) systems for mechanically ventilated intensive care unit patients often remain unstudied. Early health technology assessments (HTA) can examine the potential impact of AI systems by using available data and simulations. Therefore, we developed a generic health-economic model suitable for early HTA of AI systems for mechanically ventilated patients.
Materials and methods: Our generic health-economic model simulates mechanically ventilated patients from their hospitalisation until their death. The model simulates two scenarios, care as usual and care with the AI system, and compares these scenarios to estimate their cost-effectiveness.
Results: The generic health-economic model we developed is suitable for estimating the cost-effectiveness of various AI systems. By varying input parameters and assumptions, the model can examine the cost-effectiveness of AI systems across a wide range of different clinical settings.
Conclusions: Using the proposed generic health-economic model, investors and innovators can easily assess whether implementing a certain AI system is likely to be cost-effective before an exact clinical impact is determined. The results of the early HTA can aid investors and innovators in deployment of AI systems by supporting development decisions, informing value-based pricing, clinical trial design, and selection of target patient groups.
Highlights
• Since there is only a low level of evidence, it is difficult to agree on state-of-the-art standards or to provide recommendations and guidelines.
• The value of combining several monitoring devices for dual or triple guidance must be challenged.
• The principle of fascial plane blocks is suitable to avoid traumatic needle-to-nerve contact. However, local toxicity must be regarded as a possible mechanism for nerve injuries.
• Block procedures might be conducted during sedation or general anesthesia when considering the individual patients' clinical situations and the expertise of the anesthesiologist.
• The quality of ultrasound equipment and education provided by the corresponding anesthesia department is highly relevant
Highlights
• Out of the six edible pumpkin seeds found in Cameroonian C. sativus showed most potent anti-proliferative effects on prostate cells.
• Its oil conserved almost all the effects of raw seeds and prevented benign prostatic hyperplasia (BPH).
• It exhibited potent anti-inflammatory activities in rat with BPH.
Abstract
Pumpkin seeds are claimed to treat prostate tumour/cancer. The in vitro (ability to inhibit cell growth through MTT assay) and in vivo (ability to prevent testosterone-induced BPH in rats at the doses of 125, 250, 500 and 1000 mg/kg BW) of six edible pumpkin seeds found in Cameroonian were assessed. The endpoints were cell growth arrest, prostate mass and volume, prostatic epithelium height, prostatic proteins, prostate specific antigen (PSA) and inflammatory cytokines. In vitro, C. sativus seeds exhibited the most potent antiproliferative effects on DU145 and PC3 prostate cancer cells and its oil conserved almost all the effects of raw seeds. Further, it prevented the increased of prostate relative mass and volume, prostate epithelium height, PSA and testosterone dose-dependently compared to normal rats. This effect is thought to be mediated through antiandrogenic, estrogenic and anti-inflammatory activities, evidenced by a decreased in IL-1β, IL-6 and TNFα level. Overall, this results justify its traditional use.
Background: Trauma-related guilt and shame are crucial for the development and maintenance of PTSD (posttraumatic stress disorder). We developed an intervention combining cognitive techniques with loving-kindness meditations (C-METTA) that specifically target these emotions. C-METTA is an intervention of six weekly individual treatment sessions followed by a four-week practice phase.
Objective: This study examined C-METTA in a proof-of-concept study within a randomized wait-list controlled trial.
Method: We randomly assigned 32 trauma-exposed patients with a DSM-5 diagnosis to C-METTA or a wait-list condition (WL). Primary outcomes were clinician-rated PTSD symptoms (CAPS-5) and trauma-related guilt and shame. Secondary outcomes included psychopathology, self-criticism, well-being, and self-compassion. Outcomes were assessed before the intervention phase and after the practice phase.
Results: Mixed-design analyses showed greater reductions in C-METTA versus WL in clinician-rated PTSD symptoms (d = −1.09), guilt (d = −2.85), shame (d = −2.14), psychopathology and self-criticism.
Conclusion: Our findings support positive outcomes of C-METTA and might contribute to improved care for patients with stress-related disorders. The study was registered in the German Clinical Trials Register (DRKS00023470).
HIGHLIGHTS
C-METTA is an intervention that addresses trauma-related guilt and shame and combines cognitive interventions with loving-kindness meditations.
A proof-of-concept study was conducted examining C-METTA in a wait-list randomized controlled trial
C-METTA led to reductions in trauma-related guilt and shame and PTSD symptoms.
We conducted a systematic review investigating the efficacy and tolerability of adrenocorticotropic hormone (ACTH) and corticosteroids in children with epilepsies other than infantile epileptic spasm syndrome (IESS) that are resistant to anti-seizure medication (ASM). We included retrospective and prospective studies reporting on more than five patients and with clear case definitions and descriptions of treatment and outcome measures. We searched multiple databases and registries, and we assessed the risk of bias in the selected studies using a questionnaire based on published templates. Results were summarized with meta-analyses that pooled logit-transformed proportions or rates. Subgroup analyses and univariable and multivariable meta-regressions were performed to examine the influence of covariates. We included 38 studies (2 controlled and 5 uncontrolled prospective; 31 retrospective) involving 1152 patients. Meta-analysis of aggregate data for the primary outcomes of seizure response and reduction of electroencephalography (EEG) spikes at the end of treatment yielded pooled proportions (PPs) of 0.60 (95% confidence interval [CI] 0.52–0.67) and 0.56 (95% CI 0.43–0.68). The relapse rate was high (PP 0.33, 95% CI 0.27–0.40). Group analyses and meta-regression showed a small benefit of ACTH and no difference between all other corticosteroids, a slightly better effect in electric status epilepticus in slow sleep (ESES) and a weaker effect in patients with cognitive impairment and “symptomatic” etiology. Obesity and Cushing's syndrome were the most common adverse effects, occurring more frequently in trials addressing continuous ACTH (PP 0.73, 95% CI 0.48–0.89) or corticosteroids (PP 0.72, 95% CI 0.54–0.85) than intermittent intravenous or oral corticosteroid administration (PP 0.05, 95% CI 0.02–0.10). The validity of these results is limited by the high risk of bias in most included studies and large heterogeneity among study results. This report was registered under International Prospective Register of Systematic Reviews (PROSPERO) number CRD42022313846. We received no financial support.
Key points
* Systematic review resulting in low to moderately solid evidence on the efficacy and tolerability of adrenocorticotropic hormone (ACTH) and corticosteroid treatment in children with epilepsy other than infantile spasms.
* Meta-analysis based on aggregate data from 2 controlled prospective, 5 uncontrolled prospective, and 31 retrospective studies.
* Pooled data showing a seizure response in 60% and electroencephalography (EEG) response in 56% of patients, with no major differences between drugs. However, 30%–40% of patients relapse after the cessation of treatment.
* The most frequent adverse effects are obesity and Cushing's syndrome, occurring in 70% of patients under continuous treatment for some weeks, but in less than 10% undergoing pulsed, intermittent regimens.
* More prospective, randomized-controlled studies are needed to improve the level of evidence and define the optimal doses and treatment duration.
Background: The Association of the Scientific Medical Societies in Germany (AWMF) clinical practice guideline on cochlear implant (CI) treatment, which was updated in 2020, defined the entire process of CI care for the first time. In the present study, the feasibility and results of very early rehabilitation were examined.
Materials and methods: The intervention group (IG) comprised 54 patients in whom rehabilitation was initiated within 14 (maximally 28) days after implantation. Patients with a significantly longer waiting time were included in the control group (CG, n = 21). In addition to the start and duration of rehabilitation, the speech intelligibility achieved with CI was recorded at different timepoints within a 12-month period. In addition, questionnaires were used to assess the effort of fitting the CI processor and the patients’ satisfaction with the outcome as well as the timing of the start of rehabilitation.
Results: Median waiting time between implantation and start of rehabilitation was 14 days in the IG and 106 days in the CG; 92.6% of IG patients were able to start rehabilitation within 14 days. The effect of rehabilitation in the IG was 35 and in the CG 25 percentage points (Freiburg monosyllabic test). After 6 and 12 months of CI use, both groups showed comparable results in the test condition in quiet (IG/CG 6 months: 70%/70%; 12 months: 70%/60%, Freiburg monosyllabic test) and in noise (IG/CG 6 months: −1.1 dB SNR/–0.85 dB SNR; 12 months: −0.65 dB SNR/+0.3 dB SNR, Oldenburg sentence test). Hearing quality assessment scores collected by SSQ (Speech, Spatial and Qualities of Hearing Scale) questionnaire showed better scores in the IG at 6 months, which converged to CG scores at 12 months. The IG was significantly more satisfied with the timing of the start of rehab than the CG. All other data obtained from questionnaires showed no differences between the two groups.
Conclusion: A very early start of inpatient rehabilitation after cochlear implantation was successfully implemented. The rehabilitation was completed within 7 weeks of CI surgery. Comparison of speech recognition test results before and after rehabilitation showed a significant improvement. A clear rehabilitation effect can therefore be demonstrated. Inclusion of CI rehabilitation in the German catalog of follow-up treatments is thus scientifically justified and therefore strongly recommended.
Viruses that carry a positive-sense, single-stranded (+ssRNA) RNA translate their genomes soon after entering the host cell to produce viral proteins, with the exception of retroviruses. A distinguishing feature of retroviruses is reverse transcription, where the +ssRNA genome serves as a template to synthesize a double-stranded DNA copy that subsequently integrates into the host genome. As retroviral RNAs are produced by the host cell transcriptional machinery and are largely indistinguishable from cellular mRNAs, we investigated the potential of incoming retroviral genomes to directly express proteins. Here we show through multiple, complementary methods that retroviral genomes are translated after entry. Our findings challenge the notion that retroviruses require reverse transcription to produce viral proteins. Synthesis of retroviral proteins in the absence of productive infection has significant implications for basic retrovirology, immune responses and gene therapy applications.
Bipolar disorder (BD) is a heritable mental illness with complex etiology. While the largest published genome-wide association study identified 64 BD risk loci, the causal SNPs and genes within these loci remain unknown. We applied a suite of statistical and functional fine-mapping methods to these loci, and prioritized 22 likely causal SNPs for BD. We mapped these SNPs to genes, and investigated their likely functional consequences by integrating variant annotations, brain cell-type epigenomic annotations, brain quantitative trait loci, and results from rare variant exome sequencing in BD. Convergent lines of evidence supported the roles of SCN2A, TRANK1, DCLK3, INSYN2B, SYNE1, THSD7A, CACNA1B, TUBBP5, PLCB3, PRDX5, KCNK4, AP001453.3, TRPT1, FKBP2, DNAJC4, RASGRP1, FURIN, FES, YWHAE, DPH1, GSDMB, MED24, THRA, EEF1A2, and KCNQ2 in BD. These represent promising candidates for functional experiments to understand biological mechanisms and therapeutic potential. Additionally, we demonstrated that fine-mapping effect sizes can improve performance and transferability of BD polygenic risk scores across ancestrally diverse populations, and present a high-throughput fine-mapping pipeline (https://github.com/mkoromina/SAFFARI).
Spezialwissen für SCALE
(2024)
Volker Zickermann und Eric Helfrich sind bei der Exzellenzcluster-Initiative SCALE (Subcellular Architecture of Life) dabei und werden dort ihre Expertise einbringen. Das Spezialgebiet des einen ist ein Proteinkomplex in den Mitochondrien, den Kraftwerken der Zelle. Der andere sucht schwerpunktmäßig bisher unbekannte Naturstoffe, die die Basis für neue Antibiotika sein könnten.
Herzforschung meets KI
(2024)
Moderne Methoden der Künstlichen Intelligenz (KI) spielen in der Wissenschaft eine immer größere Rolle. Wie Forscher des Exzellenzclusters Cardio-Pulmonary Institute (CPI) KI in der Herzbildgebung nutzen, zeigte Professor Eike Nagel im Rahmen der Bürgeruniversität der Goethe-Universität. Er leitet das Institut für experimentelle und translationale kardiovaskuläre Bildgebung am Fachbereich Medizin und forscht an der Entwicklung verbesserter Behandlungsmöglichkeiten für Herz-Kreislauf-Erkrankungen. Mit dem Ziel, seine Forschung für alle Menschen zugänglich und verständlicher zu machen, lud Prof. Nagel interessierte Bürger*innen am 10. Mai in sein Institut ein.
Diese Arbeit hatte das Ziel, die Größe einer DVT-Aufnahme (FOV) mit der Größe der durch die Indikationsstellung definierten Region (ROI) zu vergleichen. Durch eine speziell dafür entwickelte Software sollten Messungen in den Datensätzen ermöglicht werden. Die dazu verwendeten 332 Datensätze wurden zufallsverteilt aus den mit einem Orthophos SL-3D DVT-Gerät der Firma Dentsply Sirona in der Poliklinik für zahnärztliche Chirurgie und Implantologie des ZZMK (Carolinum) in Frankfurt angefertigten Röntgenaufnahmen selektiert.
Es wurde die Auswertungssoftware ExRoi entwickelt, mit der die Werte des axialen Durchmessers, die Höhe (vertikale Dimension) sowie die Distanz der Mittelpunkte von FOV und ROI direkt in den Datensätzen bestimmt werden konnten. Zusätzlich wurde festgehalten, welche rechtfertigenden Indikationen gestellt und welche Auflösungsmodi verwendet wurden.
Die Stichprobe bestand aus Aufnahmen mit einem axialen Durchmesser von 8 cm [VOL 1] (n= 76, entsprechend 46,39%), 5 cm Durchmesser [VOL 2] (n = 102, entsprechend 30,72%) und 11 cm Durchmesser [VOL 3] (n= 154, entsprechend 22,89%). 95,18% der Aufnahmen wurden im HD-Modus mit laut Herstellerangaben vier Mal so vielen Aufnahmen im Vergleich zum SD-Modus angefertigt. Hauptindikationen waren Implantat Planung (45,1%) und Planungen komplizierter Zahn-Extraktionen (25,5%).
Die Messungen zum Vergleich des axialen Durchmessers zeigten, dass bei Verwendung des VOL 2 die ROI im Mittel den größten Anteil der FOV nutzt (78,52 %), den kleinsten Anteil nutzt durchschnittlich VOL 1 (56,04 %). Dazwischen liegt VOL 3 (69,12 %). In der Vertikalen nutzt die ROI von VOL 3 mittelwertig den größten Anteil der FOV (81,87 %), den kleinsten Mittelwert hat VOL 1 (58,76 %). VOL 2 liegt zwischen diesen Werten (64,47 %).
In allen Fällen war das FOV größer als die ROI und die ROI lag im Bereich des gewählten FOV.
Die Mittelpunkte von FOV und ROI lagen im Mittel in der axialen Ebene in Abhängigkeit vom gewählten Volumen um rund 9-13 mm auseinander, in der coronalen und sagittalen Ebene um rund 5-6mm.
Aus diesen Ergebnissen kann für das verwendete Gerät eine gute Trefferquote für die ROI abgeleitet werden. Höhe und Durchmesser des FOV hätten in den meisten Fällen kleiner gewählt werden können, liegen aber angesichts der vorhandenen Auswahl-Optionen des Röntgengeräts zur Dimensionierung der Volumina in einem akzeptablen Bereich.
Hintergrund: Mit der im Jahr 2020 aktualisierten AWMF-Leitlinie zur Versorgung mit einem Cochleaimplantat (CI) wurde erstmals der gesamte Prozess einer CI-Versorgung definiert. In der vorliegenden Studie wurden die Machbarkeit und die Ergebnisse einer sehr frühen Rehabilitationsmaßnahme (Reha) untersucht.
Methodik: Es wurden 54 Patienten in die Interventionsgruppe (IG) eingeschlossen, bei der die Reha innerhalb von 14 (maximal 28) Tagen nach der Implantation eingeleitet wurde. In eine Kontrollgruppe (KG, n = 21) wurden Patienten mit deutlich längerer Wartezeit eingeschlossen. Neben dem Beginn und der Dauer der Reha wurde das mit CI erreichte Sprachverstehen zu verschiedenen Zeitpunkten innerhalb von 12 Monaten erfasst. Zusätzlich wurde mit Fragebögen der Aufwand der Anpassung des CI-Prozessors und die Zufriedenheit der Patienten mit dem Ergebnis sowie dem Zeitpunkt des Beginns der Reha ermittelt.
Ergebnisse: Die Wartezeit zwischen Implantation und Beginn der Reha lag in der IG bei 14 Tagen und in der KG bei 106 Tagen (Mediane). Es konnten 92,6 % der Patienten der IG die Reha innerhalb von 14 Tagen antreten. Der Effekt der Reha lag in der IG bei 35 und in der KG bei 25 Prozentpunkten (Freiburger Einsilbertest). Nach 6 und 12 Monaten (M) CI-Nutzung zeigten beide Gruppen sowohl in der Testbedingung in Ruhe (IG/KG 6M: 70 %/70 %; 12M: 70 %/60 %, Freiburger Einsilbertest) als auch im Störgeräusch (IG/KG 6M: −1,1 dB SNR/–0,85 dB SNR; 12M: −0,65 dB SNR/+0,3 dB SNR, Oldenburger Satztest) vergleichbare Ergebnisse. Die mittels des Fragebogens Speech, Spatial and Qualities of Hearing Scale (SSQ) erfassten Ergebnisse für die Einschätzung der Hörqualität zeigten nach 6 Monaten eine bessere Bewertung in der IG, die sich nach 12 Monaten an die Ergebnisse der KG anglich. Die IG war mit dem Zeitpunkt des Beginns der Reha deutlich zufriedener als die KG. Alle anderen aus Fragebögen ermittelten Daten zeigten keine Unterschiede zwischen den beiden Gruppen.
Schlussfolgerung: Der sehr frühe Beginn einer stationären Reha nach Cochleaimplantation ist erfolgreich umsetzbar. Die Reha konnte innerhalb von 7 Wochen nach der Implantation abgeschlossen werden. Der Vergleich der Ergebnisse der Tests des Sprachverstehens vor und nach der Reha zeigte eine deutliche Steigerung. Somit ist ein deutlicher Reha-Effekt nachweisbar. Die Aufnahme der CI-Rehabilitation in den Katalog der Anschlussheilbehandlungen ist somit wissenschaftlich begründet und damit dringend zu empfehlen.
Human feline leukaemia virus subgroup C receptor-related proteins 1 and 2 (FLVCR1 and FLVCR2) are members of the major facilitator superfamily1. Their dysfunction is linked to several clinical disorders, including PCARP, HSAN and Fowler syndrome2,3,4,5,6,7. Earlier studies concluded that FLVCR1 may function as a haem exporter8,9,10,11,12, whereas FLVCR2 was suggested to act as a haem importer13, yet conclusive biochemical and detailed molecular evidence remained elusive for the function of both transporters14,15,16. Here, we show that FLVCR1 and FLVCR2 facilitate the transport of choline and ethanolamine across the plasma membrane, using a concentration-driven substrate translocation process. Through structural and computational analyses, we have identified distinct conformational states of FLVCRs and unravelled the coordination chemistry underlying their substrate interactions. Fully conserved tryptophan and tyrosine residues form the binding pocket of both transporters and confer selectivity for choline and ethanolamine through cation–π interactions. Our findings clarify the mechanisms of choline and ethanolamine transport by FLVCR1 and FLVCR2, enhance our comprehension of disease-associated mutations that interfere with these vital processes and shed light on the conformational dynamics of these major facilitator superfamily proteins during the transport cycle.
Highlights
• Constrictional structures range from dome-and-basin folds to coeval folds and boudins.
• Under bulk constriction, the competent layer rotates slower than a passive plane.
• Extension-parallel and –perpendicular folds grow simultaneously.
• Extension-perpendicular folds affect previous boudins.
Abstract
We conducted scaled analogue modelling to show the influence of varying single layer initial orientation on the geometry of folds and boudins in a bulk constrictional strain field. The initial angle between the plane of shortening and the competent layer (θZ(i)) was incrementally increased from 0° to 90° by multiples of 11.25°. While the amount of layer thickening decreased with increasing θZ(i), the deformation structures produced range from pure dome-and-basin folds to coeval folds and boudins. Based on the attitude of fold axes, there are extension-parallel (FEPR) and extension-perpendicular (FEPP) folds, with axes subparallel and subperpendicular to the principal stretching axis (X), respectively. Coeval growth of FEPR folds and boudins occurred when θZ(i) > ca. 25°. The FEPP folds can be subdivided into a first type which affect the entire layer (if θZ(i) ranges between 11.25 and 78.75°) and a second type, referred to as FBEPP folds, which are affecting pre-existing boudins if θZ(i) > 45°. The interlimb angle of all types of folds increases with increasing θZ(i). Folds and boudins similar to the ones produced in this study can be found in salt domes and in tectonites of subduction zones.
Hematopoietic mutations in epigenetic regulators like DNA methyltransferase 3 alpha (DNMT3A), play a pivotal role in driving clonal hematopoiesis of indeterminate potential (CHIP), and are associated with unfavorable outcomes in patients suffering from heart failure (HF). However, the precise interactions between CHIP-mutated cells and other cardiac cell types remain unknown. Here, we identify fibroblasts as potential partners in interactions with CHIP-mutated monocytes. We used combined transcriptomic data derived from peripheral blood mononuclear cells of HF patients, both with and without CHIP, and cardiac tissue. We demonstrate that inactivation of DNMT3A in macrophages intensifies interactions with cardiac fibroblasts and increases cardiac fibrosis. DNMT3A inactivation amplifies the release of heparin-binding epidermal growth factor-like growth factor, thereby facilitating activation of cardiac fibroblasts. These findings identify a potential pathway of DNMT3A CHIP-driver mutations to the initiation and progression of HF and may also provide a compelling basis for the development of innovative anti-fibrotic strategies.
Tight control over transcription factor activity is necessary for a sensible balance between cellular proliferation and differentiation in the embryo and during tissue homeostasis by adult stem cells, but mechanistic details have remained incomplete. The homeodomain transcription factor MEIS2 is an important regulator of neurogenesis in the ventricular–subventricular zone (V-SVZ) adult stem cell niche in mice. We here identify MEIS2 as direct target of the intracellular protease calpain-2 (composed of the catalytic subunit CAPN2 and the regulatory subunit CAPNS1). Phosphorylation at conserved serine and/or threonine residues, or dimerization with PBX1, reduced the sensitivity of MEIS2 towards cleavage by calpain-2. In the adult V-SVZ, calpain-2 activity is high in stem and progenitor cells, but rapidly declines during neuronal differentiation, which is accompanied by increased stability of MEIS2 full-length protein. In accordance with this, blocking calpain-2 activity in stem and progenitor cells, or overexpression of a cleavage-insensitive form of MEIS2, increased the production of neurons, whereas overexpression of a catalytically active CAPN2 reduced it. Collectively, our results support a key role for calpain-2 in controlling the output of adult V-SVZ neural stem and progenitor cells through cleavage of the neuronal fate determinant MEIS2.
The human immune system is determined by the functionality of the human lymph node. With the use of high-throughput techniques in clinical diagnostics, a large number of data is currently collected. The new data on the spatiotemporal organization of cells offers new possibilities to build a mathematical model of the human lymph node - a virtual lymph node. The virtual lymph node can be applied to simulate drug responses and may be used in clinical diagnosis. Here, we review mathematical models of the human lymph node from the viewpoint of cellular processes. Starting with classical methods, such as systems of differential equations, we discuss the values of different levels of abstraction and methods in the range from artificial intelligence techniques formalism.
Background: A good physician should be empathic and altruistic, among other qualities. Therefore, the levels of socially undesirable personality traits (Dark Triad) as well as implicit motives of achievement, affiliation and power (Multi-Motive Grid) among medical students as future physicians were analyzed at two different points in their medical training.
Methods: This study includes 380 medical students in their first year and 217 in their third year in Germany. All participants completed the Dirty Dozen (DD) and Multi-Motive Grid (MMG) questionnaires at the end of two different classes as paper-and-pencil tests. Relevant differences of the Dark Triad traits between the medical students and reference sample and the two different cohorts, as well as their implicit motives, the associations of Dark Triad traits and MMG components and gender differences of the Dark Triad traits were calculated.
Results: There were no significant group differences between year one and year three medical students in narcissism, psychopathy and Machiavellianism (Dark Triad). There were no significant differences between the medical students and reference sample except in psychopathy. Male students scored significantly higher in the Dark Triad traits than female students. In the MMG, first-year students scored significantly higher levels in Fear of Rejection, and lower levels in Hope of Success and Hope of Power than the third-year students. Some associations were found between narcissism and Machiavelliansim with Hope of Success, Hope of Power and Fear of power.
Conclusions: Dark Triad traits already appear to exist before the commencement of medical studies. These traits do not differ significantly between the medical students and reference sample; only a few MMG components seem to differ at different stages of their studies. This lack of differences between the medical students and validation cohort indicates that tests based on (undesirable) personality traits are not suitable criteria for the admission selection of medical students.
Highlights
• It is important to distinguish acute provoked seizures due to autoimmune encephalitis from chronic unprovoked seizures due to autoimmune-associated epilepsy.
• Currently it is hardly possible in an individual AIE/ALE/RE patient to separate acute provoked seizures from chronic unprovoked seizures due to limitations in determining seizure outcomes, unclear time courses, potential causal interactions between both seizure origins, compartmentalized immune-inflammation, and a lack of licensed drugs to reliably resolve immune-inflammation in the brain parenchyma.
• This makes it hard to decide when to terminate ASMs and to counsel the individual patient regarding driving abilities and other behavioral restrictions and recommendations.
• Studies are urgently needed to define clinical and paraclinical biomarkers in a hypothesis-free, data-driven approach reliably predicting (or not) the development of AAE and the cognitive and behavioral outcome in the due course of an individual patient´s disease.
• These studies should be experimentally validated in suitable animal models.
Abstract
The current International League Against Epilepsy (ILAE) definition and classification guidelines for the first time introduced the category of immune-mediated focal epilepsy in addition to structural, genetic, infectious, and metabolic aetiologies. Moreover, the ILAE Autoimmunity and Inflammation Taskforce recently provided a conceptual framework for the distinction between acute “provoked” seizures in the acute phase of autoimmune encephalitis from chronic “unprovoked” seizures due to autoimmune-associated epilepsy. The first category predominately applies to those autoimmune encephalitis patients with autoantibodies against cell surface neural antigens, in whom autoantibodies are assumed to exert a direct ictogenic effect without overt structural damage. These patients do not exhibit enduring predisposition to seizures after the “acute phase” encephalitis, and thus do not fulfil the definition of epilepsy. The second category applies to those autoimmune encephalitis patients with autoantibodies against intracellular neural antigens and Rasmussen's encephalitis, in whom T cells are assumed to cause epileptogenic effects through immune-inflammation and overt structural damage. These patients do exhibit enduring predisposition to seizures after the “acute phase” of encephalitis and thus fulfil the definition of epilepsy. AAE may result from both, ongoing brain autoimmunity and associated structural brain damage according to the current ILAE definition and classification guideline. We here discuss the shortcomings and defaults of this concept and suggest an unbiased translationally validated and data-driven approach to predict in an individual encephalitis patient the propensity to develop (or not) AAE and the cognitive and behavioural outcome.
Die vorliegende Arbeit behandelt den Vergleich zweier Geräte - „Endotrust MiFusion TLS 2“ und „Medtronic LigaSure Maryland System“ - zur endoskopischen Entnahme der Arteria radialis (RA) zur Verwendung als Bypass-Gefäß in der Herzchirurgie.
Grundsätzlich kommen in der Bypass-Chirurgie zur Herstellung eines Free-Grafts am Herzen neben der Verwendung der Thoraxarterien die Vena Saphena Magna (VSM) sowie die RA in Frage. In den aktuellen europäischen Leitlinien zur Behandlung von hochgradigen Stenosen wird die Verwendung der RA empfohlen („Class 1 Level B“-Empfehlung).
Die Frage, ob die RA für den Einsatz als Bypass-Gefäß offen oder endoskopisch entnommen werden sollte, ist in der Literatur weiterhin umstritten. In den aktuellen Leitlinien zur Behandlung von koronaren Herzkrankheiten wird aufgrund dieser insoweit uneindeutigen Studienlage keine Empfehlung ausgesprochen. Trotzdem ist die endoskopische Entnahme der RA im klinischen Alltag mittlerweile etabliert. Im Kontext dieser uneindeutigen Studienlage einerseits und der praktischen Bedeutung endoskopischer Entnahme andererseits ist es Zielsetzung der vorliegenden Arbeit, durch einen Gerätevergleich einen Beitrag zur Optimierung der endoskopischen Operationstechnik zu leisten. Es soll zudem aufgezeigt werden, inwieweit die endoskopische Entnahme der RA ein sicheres und effizientes Verfahren darstellt.
In der Literatur zum Vergleich von Operationstechniken zur Entnahme von Bypass-Gefäßen werden häufig histologische Untersuchungen angewendet. Diese ermöglichen eine zeitnahe Beurteilung der Qualität des entnommenen Grafts. Das ist auch in dieser Arbeit der wesentliche Grund dafür, dass die histologische Beurteilung der Qualität der RA als primärer Endpunkt angewendet wird. In Anlehnung an die Literatur wurde die strukturelle Integrität des Endothels und der Elastica interna beurteilt. Die histologische Beurteilung erfolgte nach Immunfluoreszenz-Bearbeitung der Proben.
Im Einklang mit der bestehenden Literatur zur Frage, ob die RA offen oder endoskopisch entnommen werden sollte, wurde in dieser Studie als sekundäre Endpunkte Kriterien bezüglich der Sicherheit und Effizienz der Entnahme verwendet. Dies betrifft das Auftreten von intra- und postoperativen Komplikationen, insbesondere im Hinblick auf neurologische Beeinträchtigungen am operierten Arm, sowie die Entnahmedauer und den operativen Aufwand zur Blutstillung.
Die in dieser Arbeit behandelte Studie wurde als prospektive, 1:1 randomisierte Studie mit zwei Gruppen mit jeweils 50 Patienten durchgeführt. Alle Operationen erfolgten im Zeitraum Januar 2017 bis Juli 2017 im Herzzentrum der Kerckhoff-Klinik Bad Nauheim.
Bezüglich der Resultate des Gerätevergleichs zeigte sich ein eindeutiges Ergebnis. Sämtliche Beurteilungskriterien, bei denen signifikante Unterschiede zwischen den beiden Gruppen aufgetreten sind, u.a. Integrität der Elastica interna, Entnahmedauer, Vorkommen von Residualblutungen, Auftreten von sensorischen Störungen fallen zugunsten des LigaSure-Systems aus.
Dabei ist unserer Meinung nach der wichtigste Einzelaspekt, dass die histologisch ermittelte Integrität der Elastica interna als Indikator für die Qualität des entnommen Grafts in der LigaSure-Gruppe signifikant besser war als in der MiFusion-Gruppe. Dagegen konnten aus der histologischen Untersuchung des Endothels keine klaren Rückschlüsse gezogen werden. Insofern besteht Unsicherheit, ob die Schädigung der Endothelschicht durch die Entnahme selbst oder durch die anschließende Präparierung der entnommenen Proben verursacht wurde.
Bezüglich der sekundären Endpunkte zeigten sich für die Mifusion-Patientengruppe im Vergleich zu anderen Studien zur endoskopischen Entnahme der RA zufriedenstellende bis gute und für die LigaSure Gruppe gute bis sehr gute Ergebnisse. Unabhängig vom verwendeten Gerät kann diese Studie deshalb als eine Bestätigung bisheriger Studien zur Vorteilhaftigkeit der endoskopischen RA-Entnahme angesehen werden. Letztlich fehlt jedoch weiterhin der Nachweis, dass eine endoskopische Entnahme unbedenklich im Hinblick auf den langfristigen kardiologischen Outcome ist. Dies bleibt zukünftiger Forschung vorbehalten.
Darüber hinaus trägt die Studie dazu bei, das klinische Erfahrungswissen über operationstechnische Details bei der Entnahme der Radialarterie zu erweitern und somit die Akzeptanz für die Verwendung der Radialarterie als Bypass-Gefäß in der koronaren Herzchirurgie zu verbessern.
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.
Non-alcoholic steatohepatitis (NASH) and alcoholic steatohepatitis (ASH) are the leading causes of liver disease worldwide. To identify disease-specific pathomechanisms, we analyzed the lipidome, metabolome and immune cell recruitment in livers in both diseases. Mice harboring ASH or NASH had comparable disease severities regarding mortality rate, neurological behavior, expression of fibrosis marker and albumin levels. Lipid droplet size was higher in NASH than ASH and qualitative differences in the lipidome were mainly based on incorporation of diet-specific fatty acids into triglycerides, phosphatidylcholines and lysophosphatidylcholines. Metabolomic analysis showed downregulated nucleoside levels in both models. Here, the corresponding uremic metabolites were only upregulated in NASH suggesting stronger cellular senescence, which was supported by lower antioxidant levels in NASH as compared to ASH. While altered urea cycle metabolites suggest increased nitric oxide synthesis in both models, in ASH, this depended on increased L-homoarginine levels indicating a cardiovascular response mechanism. Interestingly, only in NASH were the levels of tryptophan and its anti-inflammatory metabolite kynurenine upregulated. Fittingly, high-content immunohistochemistry showed a decreased macrophage recruitment and an increased polarization towards M2-like macrophages in NASH. In conclusion, with comparable disease severity in both models, higher lipid storage, oxidative stress and tryptophan/kynurenine levels were seen in NASH, leading to distinct immune responses.
In a recent discussion on how to deal with data analysis issues initiated by reviewers of pain-related scientific manuscripts in the European Journal of Pain, a seemingly simple statistical issue was raised: two subsets of data in a paper had the same mean and standard deviation. A reviewer asked for a statistical test for or against the identity of the subset distributions. The authors insisted that if the mean and standard deviation were the same, this was sufficient evidence that the subsets of data were not significantly different.
This prompted a discussion among pain researchers, who are not necessarily primarily from the field of data science, a discussion of the importance of carefully examining the distribution of pain-related data in a journal whose primary audience is pain researchers seems warranted...
Objectives In this early retrospective cohort study, a total of 26 patients with SARS-CoV-2 were treated with bamlanivimab or casirivimab/imdevimab, and the reduction of the viral load associated with the developed clinical symptoms was analyzed.
Methods: Patients in the intervention groups received bamlanivimab or casirivimab/imdevimab. Patients without treatment served as control. Outcomes were assessed by clinical symptoms and change in log viral load from baseline based on the cycle threshold over a period of 18 days.
Results: Median log viral load decline was higher in both intervention groups after 3 and 6 days compared to control. However, at later time points, the decline of the viral load was more distinct in the control group. Mild symptoms of COVID-19 were observed in 6.3% of the intervention groups and in no patient of the control. No patients treated with bamlanivimab, 18.8% treated with casirivimab/imdevimab, and 14.2% in the control group developed moderate symptoms. Severe symptoms were recorded only in the control group (14.2%), including one related death.
Conclusion: Treatment with monoclonal SARS-CoV-2 antibodies seems to accelerate decline of virus loads, especially in the first 6 days after administration, compared to control. This may be associated with a reduced likeliness of a severe course of COVID-19.
Das Glioblastom ist eine tödliche maligne Erkrankung des zentralen Nervensystems. Etablierte Therapiekonzepte resultieren in einer Fünfjahresüberlebensrate von fünf Prozent. Die derart infauste Prognose wird unter anderem bedingt durch die Heterogenität des Tumors. Insbesondere einer Population stammzellartiger Zellen wird die Verantwortung für Resistenz und Rekurrenz des Glioblastoms zugesprochen. Die genuine Plastizität des Glioblastoms mit entsprechender Fähigkeit zur Änderungen tumorweiter Expressionsprofile und Ausbildung einzigartiger funktioneller Fähigkeiten kann ohne gezielte Beeinträchtigung von stammzellartigen Zellen womöglich nicht ausreichend überwunden werden. Als Urheber kritischer Eigenschaften erscheint die erfolgreiche Elimination dieser Population innerhalb des Glioblastoms notwendig um nachhaltige Therapieerfolge zu erzielen. Mögliche Strategien der Elimination stammzellartiger Zellen setzen an Differenzierung und Ausbeutung stammzelltypischer Signalwege zur Modulation dieser Zellen an. Hierdurch sollen zentrale Fähigkeiten der Population stammzellartiger Zellen, wie Selbsterneuerung, Resistenz gegenüber Strahlen- und Chemotherapie und erneute Formation heterogener Tumore, überwunden werden.
Zentrale zelluläre Prozesse, welche zum Erhalt des stammzellartigen Zustandes dieser Zellen beitragen, sind unter anderem der Hedgehog- und Notch-Signalweg. Einer Beeinträchtigung dieser Signalwege wohnt womöglich die Fähigkeit der effektiven Modulation zentraler Eigenschaften stammzellartiger Zellen inne. Neben diesen Signalwegen gibt es eine Reihe weiterer Prozesse, welchen eine Urheberschaft an der Resistenz der Zellen zugesprochen wird. Hierzu zählt beispielweise der Prozess der Autophagie. Die Autophagie ist ein hochkonservierter zellulärer Mechanismus zur Selbsterneuerung durch Selbstdegradation fehlerhafter zellulärer Komponenten. Gleichzeitig kann die Autophagie durch eine Überaktivität zu einem spezifischen, autophagischen Zelltod beitragen. Die Modulation dieses Dualismus kann in einer Vielzahl von Tumoren, so auch im Glioblastom, das Schicksal einer tumorfördernden Autophagie in eine antitumorale Autophagie ändern.
Im Rahmen dieser Arbeit wurde erstmalig eine Modulation zentraler Eigenschaften stammzellartiger Zellen durch die Beeinflussung ihrer zellulären Prozesse mittels kombinierter Therapie durch Arsentrioxid oder GANT und (-)-Gossypol gezeigt. Arsentrioxid wirkt unspezifisch unter anderem als Inhibitor von Notch- und Hedgehog-Signalweg. Diese Inhibition wurde auch in den untersuchten Zellen nachgewiesen und führte zu einer Reduktion von stammzelltypischen Markerproteinen und Fähigkeiten der Tumorgenese in -vitro und ex -vivo, sowie zur Sensitivierung gegenüber strahleninduzierten Schäden. Gegenüber einer spezifischen Hedgehog-Inhibition durch eine GANT-vermittelte Bindung an Gli-Transkriptionsfaktoren zeigten sich deutliche Vorteile der dualen Inhibition durch Arsentrioxid hinsichtlich der genannten Eigenschaften. Die Kombination der Substanzen mit dem pan-Bcl-Inhibitor (-)-Gossypol führte zu einer synergistischen Steigerung der antitumoralen Effekte. (-)-Gossypol wird in Gliomzellen insbesondere mit der Modulation der autophagischen Maschinerie und Auslösung eines autophagischen Zelltodes in Verbindung gebracht. Die Ergebnisse weisen parallele Signalweginteraktionen mit effektiver Modulation des DNA-Damage-Response-Systems durch die Reduktion des Proteins CHEK als kausalen Mechanismus des Synergismus der Substanzen aus.
Die beobachteten Änderungen der typischen Eigenschaften stammzellartiger Zellen durch die Therapie mit Arsentrioxid und (-)-Gossypol implizieren lohnende Folgeuntersuchungen zur weiteren Evaluation dieser Effekte in -vivo, um zukünftig translationale Ableitungen zu erlauben. Die Heterogenität des Glioblastoms und seine genuine Plastizität lassen sich womöglich erfolgreich durch multiple Eingriffe in unterschiedliche zelluläre Prozesse, hierunter Notch- und Hedgehog-Signaling, modulieren. Hierdurch könnten zentrale Eigenschaften des Glioblastoms eventuell effektiv verändert und Resistenz sowie Rekurrenz überwunden werden.
Oral e-Poster Presentations - Booth 1: Vascular 3, September 27, 2023, 10:00 AM - 10:40 AM
Background: Despite current clinical guidelines recommending suboccipital decompressive craniectomy (SDC) in patients with space-occupying cerebellar infarction when neurological deterioration occurs, the precise definition of such deterioration remains unclear. The current study aimed at characterizing whether clinical outcomes can be predicted by the GCS score immediately prior to SDC, and whether higher GCS scores are associated with better clinical outcomes. We aimed to characterize whether clinical outcomes can be predicted by the GCS score immediately prior to SDC, and if higher GCS scores are associated with better clinical outcomes.
Methods: In a single-center, retrospective analysis of 51 patients treated with SDC for space-occupying cerebellar infarction clinical and imaging data were evaluated at the timepoints of symptom onset, hospital admission and preoperatively. Clinical outcome was measured by mRS at the last available follow-up. Preoperative GCS scores were stratified into three groups (GCS 3-8, 9-11 and 12-15). Univariate and multivariate Cox regression analyses were performed using clinical and radiological parameters as predictors of clinical outcome.
Results: In Cox-regression analysis using mRS of 1-2 as a positive clinical outcome we found a significant increase in the proportional hazard ratio (HR) of 6.581 [CI 1.839-36.414]; p=0.031 for GCS scores of 12-15 prior to SDC. Clinical outcomes (mRS 3-6) were associated with infarct volume above 6.0 cm3 (HR 2.473 [CI 1.209-5.057]; p=0.013), tonsillar herniation (HR: 0.279 [CI 0.083-0.933]; p=0.038), brainstem compression (HR 0.304 [CI 0.123-0.749]; p=0.010) and a preoperative GCS score of 3-8 (HR 2.386 [CI 1.160-4.906]; p=0.018).
Conclusions: SDC should be considered in patients with infarct volumes above 6.0 cm3 with GCS scores higher than previously described in the literature, as these patients may show better long-term outcome than those in which surgery is delayed until a GCS score of 11 or lower.
Einleitung: Das Pseudoaneurysma (PSA) stellt eine der häufigsten Komplikationen nach arteriellen Punktionen dar. Dabei unterscheiden sich die Komplikationsraten kathetergestützter Verfahren bei diagnostischen Eingriffen deutlich von jenen bei therapeutischen Eingriffen. Zur Behandlung des Pseudoaneurysmas steht eine große Bandbreite an Therapieoptionen zur Verfügung, unter anderem die ultraschallgestützte Thrombininjektion (TI) sowie die Therapie mittels konventionellem Druckverband (DV). Jedoch werden venöse Thrombosen nach der Behandlung des Pseudoaneurysmas beschrieben. Der Einfluss von Antikoagulantien (AK) und Thrombozytenaggregationshemmern (TAH) sowohl auf die Erfolgsraten der Pseudoaneurysmatherapie als auch die anschließende Entstehung venöser Thrombosen wurde bisher noch nicht analysiert.
Fragestellung: Die Effektivität des Druckverbands und der Thrombininjektion bei Patienten mit Pseudoaneurysma und damit assoziierten venösen Thrombosen wurde geprüft. Außerdem wurden die Auswirkungen von Antikoagulantien und Thrombozytenaggregationshemmern auf die Erfolgsraten der Pseudoaneurysmatherapie und die damit assoziierten venösen Thrombosen untersucht.
Methoden: Es wurden von Januar 2010 bis Dezember 2018 insgesamt 468 Patienten mit Pseudoaneurysma untersucht, wovon 238 Patienten in die retrospektive Studie eingeschlossen wurden. Die Behandlung des Pseudoaneurysmas erfolgte mittels Thrombininjektion oder Druckverband. Nach Ablauf von 24 Stunden wurde der Therapieerfolg sonographisch kontrolliert, wobei auch auf das Neuauftreten venöser Beinvenenthrombosen geachtet wurde. Bei allen Patienten wurde die Medikation mit Antikoagulantien und Thrombozytenaggregationshemmern zum Zeitpunkt der Pseudoaneurysmatherapie erhoben.
Ergebnisse: Die Thrombininjektion war dem Druckverband sowohl hinsichtlich des größeren Therapieerfolgs (TI 86% vs. DV 52%, p<0,001) als auch der geringeren Thromboseinzidenz (TI 7,7% vs. DV 21,3%, p=0,039) signifikant überlegen.
Insgesamt erlitten 40 der 238 Patienten eine neu aufgetretene venöse Thrombose der unteren Extremität. Auch bei Betrachtung des Einflusses von Antikoagulantien und Thrombozytenaggregationshemmern erwies sich die 5 Thrombininjektion als dem Druckverband signifikant überlegen. Jedoch wurde bei der Thrombininjektion eine um 18% niedrigere Erfolgsrate unter Antikoagulation festgestellt (TIoAK 97% vs. TImAK 79%, p=0,22), wohingegen bei Druckverbandanlage unter Antikoagulation die Erfolgsrate nur um 6% geringer war (DVoAK 57% vs. DVmAK 51%, p=0,38). In Bezug auf die Thromboseraten nach Thrombininjektion bzw. Druckverband unter Antikoagulation oder Thrombozytenaggregationshemmern konnten keine signifikanten Unterschiede beobachtet werden.
Fazit: Es konnte nachgewiesen werden, dass die Thrombininjektion eine sichere Methode zur Behandlung des Pseudoaneurysmas darstellt und nach Ansicht der Autoren, bei vorhandener Expertise, primär angewandt werden sollte.
Denn die Thrombininjektion ist dem Druckverband in Bezug auf Erfolgs- und Thromboseraten signifikant überlegen. Antikoagulantien beeinträchtigen den Erfolg der Thrombininjektion stärker als den des Druckverbands, weshalb bei Notwendigkeit einer Pseudoaneurysmatherapie die Pausierung der Antikoagulantien im Rahmen einer patientenspezifischen Risiko-Nutzen-Abwägung in Betracht gezogen werden sollte.
Hintergrund: Die kardiale Magnetresonanztomographie (CMR) gilt als Referenzstandard für die Beurteilung der linksventrikulären Funktion und des Volumens des linken Ventrikels (LV). Neuartige Echtzeittechniken versprechen eine schnelle Bildgebung bei freier Atmung mit ähnlicher Qualität. Ziel dieser Studie war es, die Genauigkeit der standardmäßigen Steady-State-Free-Precession (SSFP)-Cine-Bildgebung bei angehaltenem Atem mit der gleichen Sequenz unter Verwendung von drei Signalmittelungen, während freier Atmung sowie mit einer Compressed-Sensing (Cs)- Echtzeittechnik während der freien Atmung zur Beurteilung von LV-Volumen und Masse zu vergleichen.
Methoden: 24 Probanden wurden mit einer Standard-SSFP-Technik bei angehaltenem Atem (BH), mit derselben Technik bei freier Atmung unter Verwendung von drei durchschnittlichen Herzzyklen (SA-FB) sowie mit einem CS-Echtzeitprotokoll bei freier Atmung (CS-FB) untersucht. Verglichen wurden die Erfassungsdauer, die Genauigkeit sowie die Inter- und Intraobserver-Variabilität von LV-Funktion, Volumen und Masse.
Ergebnisse: Die Echtzeit-Bildgebung war erheblich schneller als die freie Atmung mit drei Signalmittelwerten (p<0.001). Die Korrelation zwischen dem Referenzstandard (BH) und den beiden anderen Techniken war ausgezeichnet mit einem r2 für SA-FB vs. BH zwischen 0.74 - 0.89 und einem r2 für CS-FB vs. BH zwischen 0.81 und 0.94. SA-FB ergab mittlere Fehler zwischen 5.9% und 15% für verschiedene LV-Parameter, während CS-FB zu mittleren Fehlern von 6.5%bis 13% führte. Die Inter- und Intraobserver-Variabilität war bei der Echtzeit-Bildgebung ausgezeichnet und bei der SSFP-Bildgebung (SA-FB und BH) gut.
Schlussfolgerung: Sowohl ein Standardprotokoll mit 3 Signalmittelungen, während der freien Atmung als auch die Compressed Sensing liefern genaue und reproduzierbare Messungen des LV, während die Echtzeit-Bildgebung wesentlich schneller ist.
Die kongenitale Zytomegalievirus Infektion (cCMV-Infektion) ist die häufigste kongenitale Infektionskrankheit weltweit und ist der häufigste Grund für angeborene nicht-genetische Hörstörungen und eine häufige Ursache neurologische Entwicklungsstörungen. Die Inzidenz der cCMV-Infektion liegt in Deutschland zwischen 0,2 % – 0,5 %. Bei retroviral-exponierten Neugeborenen wird die Inzidenz mit 2,7 % – 11,4 % angegeben. Mit der erhöhten Inzidenz der cCMV-Infektion bei retroviral-exponierten Neugeborenen ergibt sich für diese Kinder ebenfalls ein erhöhtes Risiko für Langzeitfolgen. Die genaue Inzidenz der cCMV-Infektion variiert je nach untersuchter Population. Für Deutschland existiert eine retrospektive Studie, welche eine Inzidenz von 2,7 % für cCMV-Infektionen bei retroviral-exponierten Neugeborenen ermittelte. In der vorliegenden Studie wurde diese Inzidenz in einem prospektiven multizentrischem Studiendesign in Deutschland ermittelt.
Zur Ermittlung der Inzidenz der cCMV-Infektion bei retroviral-exponierten Neugeborenen und Beurteilung der Umsetzbarkeit eines cCMV-Neugeborenen-Screenings wurde ein selektives cCMV-Neugeborenen-Screening für retroviral-exponierte Neugeborene mittels PCR-Untersuchung auf CMV aus einem Mundschleimhautabstrich innerhalb der ersten 21 Lebenstage an drei Studienstandorten innerhalb Deutschlands, Mannheim, München und Frankfurt am Main, durchgeführt. Bei positivem Ergebnis der PCR auf CMV-DNA erfolgte eine Bestätigungsdiagnostik mittels erweiterter Urin- und Blutuntersuchung auf CMV. Zur Diagnostik von cCMV-assoziierten Symptomen erfolgte eine Sonographie des Abdomens und des Schädels sowie eine ausführliche körperliche Untersuchung, eine augenärztliche Evaluation und erweiterte Testungen der Gehörfunktion. Nachuntersuchungen und Therapien wurden den betroffenen Familien außerhalb der Studie angeboten.
122 / 184 (66,3 %) HIV-exponierte Neugeborene von 111 Müttern wurden im Studienzeitraum zwischen dem 24.11.2017 und dem 31.03.2021 eingeschlossen. Eine cCMV-Infektion wurde bei einem Neugeborenen nachgewiesen, sodass die Inzidenz der cCMV-Infektion bei retroviral-exponierten Neugeborenen in dieser Studie 0,8 % beträgt. Eine HIV-Mutter-Kind-Transmission wurde nicht detektiert. Die Seroprävalenz für CMV bei den HIV-positiven Frauen lag in diesem Kollektiv bei 96,1 %.
Das Neugeborene mit nachgewiesener cCMV-Infektion zeigte eine zerebrale Beteiligung mit ependymalen Zysten und einer thalamostriatalen Vaskulopathie und erhielt außerhalb der Studie eine zeitgerechte antivirale Therapie mit Beginn in der Neonatalper-ode. Im Verlauf zeigten sich trotz der antiviralen Therapie Entwicklungsstörungen mit autistischen Verhaltensweisen. Die cCMV-Infektion wäre ohne ein routinemäßiges Screening mit großer Wahrscheinlichkeit nicht nachgewiesen worden.
Die frühzeitige Untersuchung der Probanden auf eine cCMV-Infektion hat sich in dieser Studie als vorteilhaft gezeigt, da bei Nachweis einer cCMV-Infektion zeitnah weiterführende Diagnostik und Therapien angeboten werden konnten. Auch die relativ große Anzahl an rekrutierten retroviral-exponierten Neugeborenen im prospektiven Studiendesign in Zusammenarbeit mit mehreren Studienzentren in Deutschland spricht für die Validität dieser Studie. Als Limitation ist zu nennen, dass ein statistisch signifikantes Ergebnis nicht erzielt werden konnte. Aufgrund der Corona-Pandemie kam es organisationbedingt zu einer relativ hohen Anzahl an nicht eingeschlossenen Patienten. Auch die geplante Rekrutierung einer Vergleichsgruppe in Südafrika konnte aufgrund der Pandemie nicht umgesetzt werden. Falsch negative Befunde wurden im Sinne der Familie nicht mittels Goldstandardmethode überprüft, sodass eine Unterschätzung der Rate an cCMV-Infektionen möglich ist.
Insgesamt konnte diese Studie neben der Ermittlung der cCMV-Inzidenz bei retroviral-exponierten Neugeborenen in Deutschland von 0,8 % aufgezeigt werden, dass selbst symptomatische cCMV-Infektionen ohne ein systematisches cCMV-Neugeborenen-Screening nicht sicher nachgewiesen werden konnte. Zudem konnte gezeigt werden, dass ein systematisches cCMV-Neugeborenen-Screening mittels Mundschleimhautabstrich in Deutschland praktikabel ist und bei den Sorgeberechtigten Akzeptanz findet. Den erhobenen Daten zur Folge könnte ein Screening aller Neugeborener oder zumindest ein risikoadaptiertes Screening auf das Vorliegen einer cCMV-Infektion dazu beitragen, dass mehr Kinder mit asymptomatischer oder unentdeckter symptomatischer cCMV-Infektion diagnostiziert werden und so eine entsprechende Behandlung ermöglicht sowie ggf. Langzeitfolgen möglichst verringert werden.
Weitere Studien zum Effekt der verfügbaren antiviralen Therapie bei cCMV-Infektionen und regelmäßiger Kontrolluntersuchungen nach stattgehabter cCMV-Infektion sind zu empfehlen, um die Auswirkungen dieser Maßnahmen auf den Krankheitsverlauf zu evaluieren.
S100A12 ist ein Entzündungsmarker, der inflammatorische Prozesse präzise anzeigt. Entzündungsprozesse mit erhöhten S100A12 Konzentrationen spielen vor allem bei Autoimmunerkrankungen wie der der rheumatischen Arthritis (RA), autoinflammatorischen Erkrankungen wie der juvenilen idiopathische Arthritis (JIA) oder weiteren Erkrankungen wie dem familiären Mittelmeerfieber (FMF) eine wichtige Rolle. Das S100A12 Protein besitzt drei verschiedene Konformationen: das Dimer, das Tetramer und das Hexamer. In verschiedenen Studien konnte gezeigt werde, dass das Hexamer an proinflammatorische Rezeptoren wie dem Toll-like Rezeptor-4 (TLR-4) und dem „receptor for the advanced glycation end products“ (RAGE) bindet und so die Produktion von weiteren Entzündungsmediatoren stimuliert. Daher besitzt die S100A12 Hexamerkonformation eine entscheidende Rolle in Entzündungsprozessen. Das Ziel bestand somit in der Selektion von Peptiden oder „single chain variable fragment“ (scFv)-Konstrukten, die exklusiv an die hexamere Konformation von S100A12 binden.
Mittels Biopanning von Peptid- und scFv-Phagen Bibliotheken konnten Peptide und scFvs selektiert werden. Die selektierten Peptide und die selektierten scFvs wurden in ELISAs weiter auf ihre Bindungseigenschaften charakterisiert. Durch Umklonierung in einen Fc-Konstrukt Vektor konnten die scFvs als vollständige scFv-Fc-Konstrukte exprimiert werden. Die Bindung der selektierten Peptide bestätigte sich als Biotin-Fusion im anschließenden ELISA. Es zeigte sich eine sehr hohe Bindungsspezifität der Peptide und der produzierten scFv-Fc-Konstrukte an das S100A12 Hexamer.
Mit den selektierten Liganden ist es gelungen einen Test zu entwickeln: an Streptavidin immobilisierte Peptide binden spezifisch das S100A12 Hexamer aus dem Testmedium und mittels selektiertem scFv-Fc-Konstrukten lassen sich die gebundenen S100A12 Proteine detektieren. Ein Detektionsantikörper ermöglichte die Visualisierung der gebundenen scFv-Fc-Konstrukte mittels Farbreaktion. Das S100A12 Hexamer konnte durch den Testaufbau auch im Plasma spezifisch detekiert werden.
Dieser Test könnte es ermöglichen, die exakte Diagnose und vor allem das Überwachung von Patienten mit steigenden Entzündungsmarkern, wie im Rahmen der autoinflammtorischen Erkrankung JIA oder einer Erkrankung wie dem FMF, zu verbessern. Mit einem verbessertem Krankheitsmonitoring könnte ebenfalls die Therapie im frühen Stadium optimiert werden.
Zusätzlich könnte ein mögliches therapeutische Potential der S100A12 Hexamer Liganden getestet werden. Sollten die hexamerspezifischen Liganden die Interaktion von S100A12 mit ihren Rezeptoren wie TLR-4 oder RAGE blockieren, ist eine therapeutische Verwendung in der Behandlung von Autoimmun- und autoinflammatorischen Erkrankungen möglich.
Auf Grund einer hohen Inzidenz und Mortalität, welche in den nächsten Jahren voraussichtlich eine deutliche Zunahme erfahren wird, stellt die Behandlung eines HCC an alle beteiligten Fächer der Medizin, sowie an den Patienten und die Patientin, eine enorme Herausforderung dar. In der klinischen Routine hat sich die TACE, nicht nur bei Patienten im intermediären Stadium der Erkrankung, etabliert, sodass im Laufe der Erkrankung nahezu jeder zweite Patient mindestens eine TACE-Behandlung bekommt.
Der mit Radiomics betitelte, im medizinischen Bereich relativ junge, Forschungszweig beschäftigt sich mit der Idee, dass in den Schnittbildern eine für das menschliche Auge nicht sichtbare Ebene von Informationen vorliegt, welche mit den richtigen Mitteln extrahiert, relevante Daten und Informationen zur Genetik, Phänotypie und Pathophysiologie des Tumors liefern kann.
Hier greift der Ansatz dieser Arbeit an. In dieser Arbeit wird die Hypothese postuliert, dass durch die Auswertung und Integration von Lipiodolablagerungen in der Zielläsion nach der ersten durchgeführten TACE eine zuverlässigere Prognose zum Therapieansprechen und Gesamtüberleben mit Hilfe von Radiomics möglich ist, als dies klinische Scores alleine erlauben.
Dazu wurde in dieser Arbeit ein Patientenstamm von 61 Patienten untersucht. Alle Patienten litten an einem histologisch gesicherten HCC. Bei allen Patienten wurden innerhalb eines Zeitintervalls von 6 Monaten drei TACE durchgeführt mit einer nachfolgenden Verlaufskontrolle mittels kontrastmittelgestützter MRT oder CT.
In einem dezidierten, mehrstufigen Verfahren wurden aus der nativen 24 Stunden postinterventionellen CT-Kontrolle die Lipiodol anreichernden HCC-Herde segmentiert. Aus diesem segmentierten 3-D Bilddatensatz wurde eine Vielzahl von bildgebenden Biomarkern, Features, extrahiert. Die Features wurden im weiteren Prozess selektiert, redundante und nicht reproduzierbare Features wurden für das weitere Vorgehen verworfen.
Aus den vorliegenden Daten der Patienten wurden Informationen selektiert, mit welchen insgesamt 5 klinische Scores berechnet wurden, diese Scores wurden im weiteren Verfahren ebenfalls als Features angesehen.
Mehrere Machine Learning-Algorithmen wurden mit der Zielvariable: Größenregredienz des Tumors nach TACE als Folge eines annehmbaren Therapieansprechens, angelernt.
Das beste Ergebnis lieferte ein ML-Algorithmus mit einem Random Forrest Klassifikator auf der Grundlage des kombinierten, aus Radiomics-Features und klinischem Score-Features bestehendem Featuresets.
Um die initial aufgestellte Hypothese zu überprüfen wurde die Zielvariable von Größenregredienz der TL auf OS verändert. Die Performance des ML-Algorithmus in Bezug auf die neu definierte Zielvariable OS wurde hierbei mit dem C-index bewertet. Im Test-Set liegt ein C-Index von 0,67 vor. Das kombinierte Modell aus klinischem Score und Radiomics zeigt hierbei eine Überlegenheit gegenüber dem klinischen Score allein (C-Index 0,58) und dem Radiomics score (C-Index 0,60). Dies bestätigt die aufgestellte Hypothese. Das kombinierte Modell hat die Fähigkeit, anhand der Lipiodolanreicherung in der 24 Stunden postinterventionell durchgeführten CT, zur Prädiktion eines Gesamtüberlebens von HCC-Patienten nach einer TACE.
Die Patienten mit der kürzesten und längsten Überlebenszeit innerhalb der Studienpopulation dienten als Grundlage für eine Kaplan-Meier-Schätzung und Berechnung eines Risiko-Scores (siehe Abbildung 37). Dabei zeigt sich eine signifikante Differenz zwischen den Risiko-Scores. Eine Kurve dieser Art könnte zukünftig theoretisch als Schätzung zur Überprüfung der Indikation einer TACE- Wiederholung für einzelne Patienten dienen. Für eine entsprechende Generalisierbarkeit sind weiterführende Studien zur Validierung nötig. Unsere Studie liefert hier erste vielversprechende Hinweise, wobei unsere Limitationen nicht zu vernachlässigen sind, wie im Detail diskutiert.
Zusammenfassend zeigt unsere Arbeit, dass ein von uns definierter kombinierter Score, bestehend aus bildgebenden Biomarkern (Radiomics) und einem klinischen Score (m- HAP-II-Score), eine Prognose zum Gesamtüberleben nach der ersten TACE- Behandlung liefern kann. Mit Hilfe dieses kombinierten Scores war es in unserer Studienkohorte möglich abzuschätzen, ob ein Patient von weiteren TACE-Prozeduren profitieren würde. Der Behandlungsalgorithmus könnte auf dieser Basis individuell angepasst werden.
Der kombinierte Score hätte somit nicht nur das Potenzial Nebenwirkungen zu verhindern und Kosten im System einzusparen, sondern ebenfalls den Patienten potentiell individuell effektiveren Therapiealternativen zuzuführen.
The Nodular lymphocyte-predominant Hodgkin lymphoma (NLPHL) as well as the T-cell/histiocyte-rich large B-cell lymphoma (THRLBCL) are rare types of malignant lymphomas. Both NLPHL and THRLBCL are frequently observed in middle-aged men with THRLBCL presenting frequently with an advanced Ann-Arbor stage with B-symptoms and associated with more aggressive courses.3 However, due to the limited number of tumor cells in the tissue of both NLPHL and THRLBCL, limited numbers of studies have been conducted on these lymphomas and current results are mainly based on general molecular genetic studies.
In order to obtain a better understanding for these disease forms as well as possible changes in their nuclear and cytoplasmatic sizes, the following study relied on the comparison of the different NLPHL forms and THRLBCL in terms of nuclear size and nuclear volume. This was carried out using both 2D and 3D analysis. During the 2D analysis of nuclear size and nuclear volume no significant differences could be presented between those groups. However, the 3D analysis of NLPHL and THRLBCL pointed out a slightly enlarged nuclear volume in THRLBCL. Furthermore, the analysis indicated a significantly increased cytoplasmatic size of THRLBCL compared to NLPHL forms. Nevertheless, differences occurred not only between the tumor cells of both disease forms, but also the T cells presented a larger nuclear volume in THRLBCL. B cells, which were considered as the control group, did not demonstrate any significant differences between the different groups. The presented results suggest an increased activity of T cells in THRLBCL, which is most likely to be interpreted as a response against the surrounding tumor cells and probably limits the proliferation of the tumor cells. Based on these results, the importance of 3D analysis is also evident due to the fact that it is clearly superior to 2D analysis. For a better understanding of both disease forms, it is therefore recommended to use the 3D technique in combination with molecular genetic analysis in future research.
The MICOS complex subunit MIC13 is essential for mitochondrial cristae organization. Mutations in MIC13 cause severe mitochondrial hepato-encephalopathy displaying defective cristae morphology and loss of the MIC10-subcomplex. Here we identified SLP2 as a novel interacting partner of MIC13 and decipher a critical role of SLP2 for MICOS assembly at distinct steps. SLP2 provides a large interaction hub for MICOS subunits and loss of SLP2 imparted YME1L-mediated proteolysis of MIC26 and drastic alterations in cristae morphology. We further identified a MIC13-specific role in stabilizing the MIC10-subcomplex via a MIC13-YME1L axis. SLP2 together with the stabilized MIC10-subcomplex promotes efficient assembly of the MIC60-subcomplex forming the MICOS-MIB complex. Consistently, super-resolution nanoscopy showed a dispersed distribution of the MIC60 in cells lacking SLP2 and MIC13. Our study reveals converging and interdependent assembly pathways for the MIC10- and MIC60-subcomplexes which are controlled in two ways, the MIC13-YME1L and the SLP2-YME1L axes, revealing mechanistic insights of these factors in cristae morphogenesis. These results will be helpful in understanding the human pathophysiology linked to mutations in MIC13 or its interaction partners.
SAMHD1 is discussed as a tumour suppressor protein, but its potential role in cancer has only been investigated in very few cancer types. Here, we performed a systematic analysis of the TCGA (adult cancer) and TARGET (paediatric cancer) databases, the results of which did not suggest that SAMHD1 should be regarded as a bona fide tumour suppressor. SAMHD1 mutations that interfere with SAMHD1 function were not associated with poor outcome, which would be expected for a tumour suppressor. High SAMHD1 tumour levels were associated with increased survival in some cancer entities and reduced survival in others. Moreover, the data suggested differences in the role of SAMHD1 between males and females and between different races. Often, there was no significant relationship between SAMHD1 levels and cancer outcome. Taken together, our results indicate that SAMHD1 may exert pro-or anti-tumourigenic effects and that SAMHD1 is involved in the oncogenic process in a minority of cancer cases. These findings seem to be in disaccord with a perception and narrative forming in the field suggesting that SAMHD1 is a tumour suppressor. A systematic literature review confirmed that most of the available scientific articles focus on a potential role of SAMHD1 as a tumour suppressor. The reasons for this remain unclear but may include confirmation bias and publication bias. Our findings emphasise that hypotheses, perceptions, and assumptions need to be continuously challenged by using all available data and evidence.
Recent advances in mathematical modelling and artificial intelligence have challenged the use of traditional regression analysis in biomedical research. This study examined artificial and cancer research data using binomial and multinomial logistic regression and compared its performance with other machine learning models such as random forests, support vector machines, Bayesian classifiers, k-nearest neighbours and repeated incremental clipping (RIPPER). The alternative models often outperformed regression in accurately classifying new cases. Logistic regression had a structural problem similar to early single-layer neural networks, which limited its ability to identify variables with high statistical significance for reliable class assignment. Therefore, regression is not always the best model for class prediction in biomedical datasets. The study emphasises the importance of validating selected models and suggests that a mixture of experts approach may be a more advanced and effective strategy for analysing biomedical datasets.
Background: Eukaryotic gene expression is controlled by cis-regulatory elements (CREs), including promoters and enhancers, which are bound by transcription factors (TFs). Differential expression of TFs and their binding affinity at putative CREs determine tissue- and developmental-specific transcriptional activity. Consolidating genomic data sets can offer further insights into the accessibility of CREs, TF activity, and, thus, gene regulation. However, the integration and analysis of multi-modal data sets are hampered by considerable technical challenges. While methods for highlighting differential TF activity from combined chromatin state data (e.g., ChIP-seq, ATAC-seq, or DNase-seq) and RNA-seq data exist, they do not offer convenient usability, have limited support for large-scale data processing, and provide only minimal functionality for visually interpreting results.
Results: We developed TF-Prioritizer, an automated pipeline that prioritizes condition-specific TFs from multi-modal data and generates an interactive web report. We demonstrated its potential by identifying known TFs along with their target genes, as well as previously unreported TFs active in lactating mouse mammary glands. Additionally, we studied a variety of ENCODE data sets for cell lines K562 and MCF-7, including twelve histone modification ChIP-seq as well as ATAC-seq and DNase-seq datasets, where we observe and discuss assay-specific differences.
Conclusion: TF-Prioritizer accepts ATAC-seq, DNase-seq, or ChIP-seq and RNA-seq data as input and identifies TFs with differential activity, thus offering an understanding of genome-wide gene regulation, potential pathogenesis, and therapeutic targets in biomedical research.
Oral e-Poster Presentations - Booth 3: Spine 2 (Tumors), September 26, 2023, 4:10 PM - 4:50 PM
Background: Spinal metastasis remains a persistent and oftentimes urgent challenge in the neurosurgical operating room. We aim to understand metastatic spread to the spinal bone on a molecular level in endothelial cells and tumor cells to facilitate improved therapeutic approaches and diagnostics.
Methods: We established a murine syngeneic spinal bone metastasis model. In vivo dissemination was first evaluated using fluorescent beads, followed by murine cancer cell lines (B16, LLC1). We investigated short-term seeding and long-term growth to identify correlations between seeding and tumor formation. EphrinB2-Eph4 interaction has been described as a crucial mediator of spinal bone metastasis. Transient (pharmacological) and permanent (genetical) ephrinB2-Eph4 interventions were performed.
Results: Dissemination of microbeads to distinct spinal segments depended on segment and particle size. Disseminated tumor cells on the contrary showed less frequent arrest in the bone and equal distribution among segments. EphrinB2 intervention changed the dissemination behavior towards the lumbar segment. Interestingly, only transient intervention retained this distribution, permanent ephrinB2 depletion on endothelial cells (efnb2iΔEC) resulted in equal dispersion of metastases. Histological staining revealed a reduction of Endomucin (Emcn) positive structures in combination with a reduction of Type H (Emcn high/CD31 high) endothelial cells in naïve efnb2iΔEC animals. In tumor tissue, these Type H endothelial cells were unaffected. However, an increase in CD31-expressing endothelial cells was observed under endothelial ephrinB2 depletion. These CD31-expressing endothelial cells have been recently described as Type E (Emcn low/CD31 high) and implicated in angiogenesis and osteogenesis.
Conclusions: We here describe a subpopulation of endothelial cells in efnb2iΔEC mice that seems to resemble pro-angiogenic and possibly pro-adhesive type E endothelial cells. Based on these finding we propose a compensatory pro-angiogenic mechanism in efnb2iΔEC mice that is highjacking pre-existing developmental pathways, which is critical for late-stage spinal metastatic growth independent of the initial seeding and extravasation of metastatic cells.
Oral e-Poster Presentations - Booth 2: Neuro-Oncology C (Imaging&Monitoring), September 27, 2023, 1:00 PM - 2:30 PM
Background: Repetitive TMS (rTMS) can be used to non-invasively map cortical language areas. Commonly, frequencies of 5-10 Hz are used to induce speech errors. We could recently show that frequencies of 30 and 50 Hz are advantageous to achieve higher reliability. However, high-frequent rTMS applied over perisylvian regions still suffer from limited tolerability. Using short-train or paired-pulse TMS (pp-TMS) might offer a good alternative to rTMS to interfere with speech production. In this study, we, therefore, compared 30 Hz rTMS to pp-TMS aiming at improved language mapping.
Methods: 13 healthy, right-handed subjects (f=6, 25-41 years) were investigated using two different rTMS protocols: (i) 30 Hz rTMS and (ii) pp-TMS. TMS protocols were applied in a pseudo-randomized order during a picture naming task (picture-to-trigger interval: 0 ms) over cortical language areas. In a subsequent study, we compared pp-TMS also to short trains of three TMS pulses and repetitive paired pulse TMS. Language errors were post-hoc analysed by two independent raters and were assigned to eight different error categories. The level of pain was assessed on a subjective 0-10 numeric rating scale (NRS). Moreover, language error distribution was analysed using a cortical parcellation system.
Results: 30 Hz rTMS evoked a significantly higher number of errors than the pp-protocol, i.e., 18 ± 12 % vs. 10 ± 7 % (p<0.05). However, pp-TMS was significantly better tolerated with a mean NRS of 2.3 ± 1.6 vs. 3.4 ± 1.5 (p<0.05, FDR-corrected). Of note, pp-TMS could induce a higher number of anomias (15 ± 15 %) than repetitive TMS protocols (4 ± 7 %; p<0.1, FDR-corrected), but less dysarthria. The cortical distribution of errors differed between the two protocols. The results of train-of-three TMS were similar to the pp-TMS protocol.
Conclusions: Due to its better tolerability, pp-TMS might offer the possibility to stimulate regions which are particularly prone to direct facial / trigeminal nerve stimulation, e.g., the inferior frontal gyrus. Moreover, pp-TMS seems advantageous for mapping patients who are comparatively susceptible to rTMS side effects and with regard to safety in general.
Leukemia cells reciprocally interact with their surrounding bone marrow microenvironment (BMM), rendering it hospitable to leukemia cell survival, for instance through the release of small extracellular vesicles (sEVs). In contrast, we show here that BMM deficiency of pleckstrin homology domain family M member 1 (PLEKHM1), which serves as a hub between fusion and secretion of intracellular vesicles and is important for vesicular secretion in osteoclasts, accelerates murine BCR-ABL1+ B-cell acute lymphoblastic leukemia (B-ALL) via regulation of the cargo of sEVs released by BMM-derived mesenchymal stromal cells (MSCs). PLEKHM1-deficient MSCs and their sEVs carry increased amounts of syntenin and syndecan-1, resulting in a more immature B-cell phenotype and an increased number/function of leukemia-initiating cells (LICs) via focal adhesion kinase and AKT signaling in B-ALL cells. Ex vivo pretreatment of LICs with sEVs derived from PLEKHM1-deficient MSCs led to a strong trend toward acceleration of murine and human BCR-ABL1+ B-ALL. In turn, inflammatory mediators such as recombinant or B-ALL cell–derived tumor necrosis factor α or interleukin-1β condition murine and human MSCs in vitro, decreasing PLEKHM1, while increasing syntenin and syndecan-1 in MSCs, thereby perpetuating the sEV-associated circuit. Consistently, human trephine biopsies of patients with B-ALL showed a reduced percentage of PLEKHM1+ MSCs. In summary, our data reveal an important role of BMM-derived sEVs for driving specifically BCR-ABL1+ B-ALL, possibly contributing to its worse prognosis compared with BCR-ABL1− B-ALL, and suggest that secretion of inflammatory cytokines by cancer cells in general may similarly modulate the tumor microenvironment.
Sex differences in pain perception have been extensively studied, but precision medicine applications such as sex-specific pain pharmacology have barely progressed beyond proof-of-concept. A data set of pain thresholds to mechanical (blunt and punctate pressure) and thermal (heat and cold) stimuli applied to non-sensitized and sensitized (capsaicin, menthol) forearm skin of 69 male and 56 female healthy volunteers was analyzed for data structures contingent with the prior sex structure using unsupervised and supervised approaches. A working hypothesis that the relevance of sex differences could be approached via reversibility of the association, i.e., sex should be identifiable from pain thresholds, was verified with trained machine learning algorithms that could infer a person's sex in a 20% validation sample not seen to the algorithms during training, with balanced accuracy of up to 79%. This was only possible with thresholds for mechanical stimuli, but not for thermal stimuli or sensitization responses, which were not sufficient to train an algorithm that could assign sex better than by guessing or when trained with nonsense (permuted) information. This enabled the translation to the molecular level of nociceptive targets that convert mechanical but not thermal information into signals interpreted as pain, which could eventually be used for pharmacological precision medicine approaches to pain. By exploiting a key feature of machine learning, which allows for the recognition of data structures and the reduction of information to the minimum relevant, experimental human pain data could be characterized in a way that incorporates "non" logic that could be translated directly to the molecular pharmacological level, pointing toward sex-specific precision medicine for pain.
Selecting the k best features is a common task in machine learning. Typically, a few features have high importance, but many have low importance (right-skewed distribution). This report proposes a numerically precise method to address this skewed feature importance distribution in order to reduce a feature set to the informative minimum of items. Computed ABC analysis (cABC) is an item categorization method that aims to identify the most important items by partitioning a set of non-negative numerical items into subsets "A", "B", and "C" such that subset "A" contains the "few important" items based on specific properties of ABC curves defined by their relationship to Lorenz curves. In its recursive form, the cABC analysis can be applied again to subset "A". A generic image dataset and three biomedical datasets (lipidomics and two genomics datasets) with a large number of variables were used to perform the experiments. The experimental results show that the recursive cABC analysis limits the dimensions of the data projection to a minimum where the relevant information is still preserved and directs the feature selection in machine learning to the most important class-relevant information, including filtering feature sets for nonsense variables. Feature sets were reduced to 10% or less of the original variables and still provided accurate classification in data not used for feature selection. cABC analysis, in its recursive variant, provides a computationally precise means of reducing information to a minimum. The minimum is the result of a computation of the number of k most relevant items, rather than a decision to select the k best items from a list. In addition, there are precise criteria for stopping the reduction process. The reduction to the most important features can improve the human understanding of the properties of the data set. The cABC method is implemented in the Python package "cABCanalysis" available at https://pypi.org/project/cABCanalysis/.
Introduction: Lumbosacral fixation is a common procedure in primary and revision spine surgery but leads to high biomechanical stress on adjacent segments and the SIJ, resulting in implant failure such as breakage and loosening and pain. This frequently results in further surgery. For patients showing clinical and radiological signs of SIJ affection/arthrosis who fail conservative therapy, transarticular lumbopelvic fusion via the SIJ may be considered. The Bedrock™ technique has been described as a new option for reinforced lumbopelvic fixation, fusing the SIJ with additional triangular titanium implants, thereby reducing biomechanical loads off the S2AI screws. We share our experiences with 19 patients treated with this technique since January 2019.
Materials and Methods: 19 patients suffering from persisting low back pain (LBP) with indication for reinforced lumbopelvic fixation and SIJ fusion were treated with reinforced lumboplevic fixation with S2AI screw and a triangular titanium implant. 14 cases were revisions. All surgeries were carried out by a single surgeon at a orthopedic university hospital. Data was gathered retrospectively.
Results: From 1/2019 - 9/2021 19 patients (11f, 8m) were treated with reinforced lumbopelvic fixation and SIJ fusion with a mean follow up of 18,2 months. Mean age 68 years (range 62-78y). Preop. walking distance was reduced to an average <100 m. Standard treatment involved S2AI screws and triangular titanium implants (SIBone, iFuse 3D™). 14 revision cases split into 5 low grade infections with screw loosening, 3 cases with rod breakage, 5 cases of painful lumbopelvic screw prominence, 7 cases with proximal junctional kyphosis, 2 cases with misplaced implants, 8 cases of poor bone mineral density. 5 patients without prior spine surgery. All patients were treated bilaterally using freehand technique. Average implant length was 65 mm. There were no intraoperative or implant associated adverse events (AE) or serious adverse events (SAE). Postoperative imaging demonstrated good implant positioning and function. All patients regained walking ability for distances > 1000 m and were satisfied with the result. All patients reported significant reduction of SIJ pain.
Conclusion: We report results of 19 patients with a reinforced lumbopelvic fixation and fusion by S2AI screws augmented by one parallelly placed triangular titanium implant fusing the SIJ bilaterally with a mean follow-up of 18.2 months. Intra- and postoperatively we experienced no implant associated adverse event. Patients regained significant walking ability and significant reduction of SIJ pain. Radiologically no signs of implant loosening or failure were detected at the end of follow-up. Our results demonstrate a safe and efficacious surgical technique for reinforced lumbopelvic fixation with fusion of SIJ with significant improvement of the health care related quality of life. Further studies need to be conducted in order to obtain additional evidence.
Background: Biological psychiatry aims to understand mental disorders in terms of altered neurobiological pathways. However, for one of the most prevalent and disabling mental disorders, Major Depressive Disorder (MDD), patients only marginally differ from healthy individuals on the group-level. Whether Precision Psychiatry can solve this discrepancy and provide specific, reliable biomarkers remains unclear as current Machine Learning (ML) studies suffer from shortcomings pertaining to methods and data, which lead to substantial over-as well as underestimation of true model accuracy.
Methods: Addressing these issues, we quantify classification accuracy on a single-subject level in N=1,801 patients with MDD and healthy controls employing an extensive multivariate approach across a comprehensive range of neuroimaging modalities in a well-curated cohort, including structural and functional Magnetic Resonance Imaging, Diffusion Tensor Imaging as well as a polygenic risk score for depression.
Findings Training and testing a total of 2.4 million ML models, we find accuracies for diagnostic classification between 48.1% and 62.0%. Multimodal data integration of all neuroimaging modalities does not improve model performance. Similarly, training ML models on individuals stratified based on age, sex, or remission status does not lead to better classification. Even under simulated conditions of perfect reliability, performance does not substantially improve. Importantly, model error analysis identifies symptom severity as one potential target for MDD subgroup identification.
Interpretation: Although multivariate neuroimaging markers increase predictive power compared to univariate analyses, single-subject classification – even under conditions of extensive, best-practice Machine Learning optimization in a large, harmonized sample of patients diagnosed using state-of-the-art clinical assessments – does not reach clinically relevant performance. Based on this evidence, we sketch a course of action for Precision Psychiatry and future MDD biomarker research.
The selective autophagy of mitochondria is linked to mitochondrial quality control and is critical to a healthy organism. Ubiquitylation is sometimes needed for marking damaged mitochondria for disposal but also for governing the expression and turnover of critical regulatory proteins. We have conducted a CRISPR/Cas9 screen of human E3 ubiquitin ligases for influence on mitophagy under both basal cell culture conditions and following acute mitochondrial depolarisation. We identify two Cullin RING ligases, VHL and FBXL4 as the most profound negative regulators of basal mitophagy. Here we show that these converge through control of the mitophagy adaptors BNIP3 and BNIP3L/NIX, but that this is achieved through different mechanisms. FBXL4 suppression of BNIP3 and NIX levels is mediated via direct interaction and protein destabilisation rather than suppression of HIF1α-mediated transcription. Depletion of NIX but not BNIP3 is sufficient to restore mitophagy levels. Our study enables a full understanding of the aetiology of early onset mitochondrial encephalomyopathy that is supported by analysis of a disease associated mutation. We further show that the compound MLN4924, which globally interferes with Cullin RING ligase activity, is a strong inducer of mitophagy which can provide a research tool in this context as well as a candidate therapeutic agent for conditions linked to mitochondrial quality control.
Glioblastoma is a very aggressive tumor and represents the most common primary brain malignancy. Key characteristics include its high resistance against conventional treatments, such as radio- and chemotherapy and its diffuse tissue infiltration, preventing complete surgical resection. The analysis of migration and invasion processes in a physiological microenvironment allows for enhanced understanding of these processes and can lead to improved therapeutic approaches. Here, we combine two state-of-the-art techniques, adult organotypic brain tissue slice culture (OTC) and light sheet fluorescence microscopy (LSFM) of cleared tissues in a combined method termed OTCxLSFM. Using this methodology, we can show that glioblastoma tissue infiltration can be effectively blocked through treatment with arsenic trioxide, as well as genetic depletion of the tetraspanin, transmembrane receptor CD9. With our analysis-pipeline we gain single-cell level, three-dimensional information, as well as insights into the morphological appearance of the tumor cells.
VASP is a member of the Enabled/VASP protein family that is involved in cortical actin dynamics and may also contribute to the formation of gap junctions. In vessels, gap junctional coupling allows the transfer of signals along the vessel wall and coordinates vascular behavior. Moreover, VASP is reportedly a mediator of NO-induced inhibition of platelet aggregation. Therefore, we hypothesized that VASP exerts also important physiologic functions in arterioles. We examined the spread of vasodilations enabled by gap junctional coupling in endothelial cells as well as NO-induced arteriolar dilations in VASP-deficient mice by intravital microscopy of the microcirculation in a skeletal muscle in anesthetized mice. Conducted dilations were initiated by brief, locally confined stimulation of the arterioles with acetylcholine. The maximal diameters of the arterioles under study ranged from 30 to 40 μm. Brief stimulation with acetylcholine induced a short dilation at the local site that was also observed at remote, upstream sites without an attenuation of the amplitude up to a distance of 1.2 mm in control animals (wild-type). In contrast, remote dilations were reduced in VASP-deficient mice despite a similar local dilation indicating an impairment of conducted dilations. Superfusion of NOdonors induced a concentration-dependent dilation in wild-type mice. However, these dilations were slightly reduced in VASP-deficient animals. In contrast, dilations induced by the endothelial stimulator acetylcholine were fully preserved in VASP-deficient mice. In summary, this study suggests that VASP exerts critical functions in arteriolar diameter control. It is crucial for the conduction of dilator signals along the endothelial cell layer. The impairment possibly reflects a perturbed formation of gap junctions in the endothelial cell membrane. VASP also participates in the full dilatory potential of NOdonors although the effect of its deficiency is only subtle. In contrast, VASP is not required for dilations initiated by endothelial stimulation which are mediated in the murine microcirculation by an EDH-mechanism.
Dendritic spines are crucial for excitatory synaptic transmission as the size of a spine head correlates with the strength of its synapse. The distribution of spine head sizes follows a lognormal-like distribution with more small spines than large ones. We analysed the impact of synaptic activity and plasticity on the spine size distribution in adult-born hippocampal granule cells from rats with induced homo- and heterosynaptic long-term plasticity in vivo and CA1 pyramidal cells from Munc-13-1-Munc13-2 knockout mice with completely blocked synaptic transmission. Neither induction of extrinsic synaptic plasticity nor the blockage of presynaptic activity degrades the lognormal-like distribution but changes its mean, variance and skewness. The skewed distribution develops early in the life of the neuron. Our findings and their computational modelling support the idea that intrinsic synaptic plasticity is sufficient for the generation, while a combination of intrinsic and extrinsic synaptic plasticity maintains lognormal like distribution of spines.
Reliable, easy-to-handle phenotypic screening platforms are needed for the identification of anti-SARS-CoV-2 compounds. Here, we present caspase 3/7 activity as a readout for monitoring the replication of SARS-CoV-2 isolates from different variants, including a remdesivir-resistant strain, and of other coronaviruses in numerous cell culture models, independently of cytopathogenic effect formation. Compared to other models, the Caco-2 subline Caco-2-F03 displayed superior performance. It possesses a stable SARS-CoV-2 susceptibility phenotype and does not produce false-positive hits due to drug-induced phospholipidosis. A proof-of-concept screen of 1,796 kinase inhibitors identified known and novel antiviral drug candidates including inhibitors of phosphoglycerate dehydrogenase (PHGDH), CDC like kinase 1 (CLK-1), and colony stimulating factor 1 receptor (CSF1R). The activity of the PHGDH inhibitor NCT-503 was further increased in combination with the hexokinase II (HK2) inhibitor 2-deoxy-D-glucose, which is in clinical development for COVID-19. In conclusion, caspase 3/7 activity detection in SARS-CoV-2-infected Caco-2-F03 cells provides a simple phenotypic high-throughput screening platform for SARS-CoV-2 drug candidates that reduces false-positive hits.
Non-coding variations located within regulatory elements may alter gene expression by modifying Transcription Factor (TF) binding sites and thereby lead to functional consequences like various traits or diseases. To understand these molecular mechanisms, different TF models are being used to assess the effect of DNA sequence variations, such as Single Nucleotide Polymorphisms (SNPs). However, few statistical approaches exist to compute statistical significance of results but they often are slow for large sets of SNPs, such as data obtained from a genome-wide association study (GWAS) or allele-specific analysis of chromatin data.
Results We investigate the distribution of maximal differential TF binding scores for general computational models that assess TF binding. We find that a modified Laplace distribution can adequately approximate the empirical distributions. A benchmark on in vitro and in vivo data sets showed that our new approach improves on an existing method in terms of performance and speed. In applications on large sets of eQTL and GWAS SNPs we could illustrate the usefulness of the novel statistic to highlight cell type specific regulators and TF target genes.
Conclusions Our approach allows the evaluation of DNA changes that induce differential TF binding in a fast and accurate manner, permitting computations on large mutation data sets. An implementation of the novel approach is freely available at https://github.com/SchulzLab/SNEEP.
5-iodotubercidin sensitizes cells to RIPK1-dependent necroptosis by interfering with NFκB signaling
(2023)
Receptor-interacting protein kinases (RIPK) −1 and −3 are master regulators of cell fate decisions in response to diverse stimuli and are subjected to multiple checkpoint controls. Earlier studies have established the presence of distinct IKK1/2 and p38/MK2-dependent checkpoints which suppress RIPK1 activation by directly phosphorylating it at different residues. In the present study, we investigated TNF-induced death in MAPK-activated protein kinase 2 (MK2)-deficient cells and show that MK2-deficiency or inactivation predominantly results in necroptotic cell death, even in the absence of caspase inhibition. While MK2-deficient cells can be rescued from necroptosis by RIPK1 inhibitors, RIPK3 inhibition seems to revert the process triggering apoptosis. To understand the mechanism of this necroptosis switch, we screened a 149-compound kinase inhibitor library for compounds which preferentially sensitize MK2-deficient MEFs to TNF-induced cell death. The most potent inhibitor identified was 5-Iodotubericidin, an adenosine analogue acting as adenosine kinase and protein kinase inhibitor. 5-ITu also potentiated LPS-induced necroptosis when combined with MK2 inhibition in RAW264.7 macrophages. Further mechanistic studies revealed that 5-Iodotubericidin induces RIPK1-dependent necroptosis in the absence of MK2 activity by suppressing IKK signaling. The identification of this role for the multitarget kinase inhibitor 5-ITu in TNF-, LPS- and chemotherapeutics-induced necroptosis will have potential implications in RIPK1-targeted therapies.
Motivation DNA CpG methylation (CpGm) has proven to be a crucial epigenetic factor in the gene regulatory system. Assessment of DNA CpG methylation values via whole-genome bisulfite sequencing (WGBS) is, however, computationally extremely demanding.
Results We present FAst MEthylation calling (FAME), the first approach to quantify CpGm values directly from bulk or single-cell WGBS reads without intermediate output files. FAME is very fast but as accurate as standard methods, which first produce BS alignment files before computing CpGm values. We present experiments on bulk and single-cell bisulfite datasets in which we show that data analysis can be significantly sped-up and help addressing the current WGBS analysis bottleneck for large-scale datasets without compromising accuracy.
Availability An implementation of FAME is open source and licensed under GPL-3.0 at https://github.com/FischerJo/FAME.
Human behaviour is inextricably linked to the interaction of emotion and cognition. For decades, emotion and cognition were perceived as separable processes, yet with mutual interactions. Recently, this differen-tiation has been challenged by more integrative approaches, but without addressing the exact neurophysiological basis of their interaction. Here, we aimed to uncover neurophysiological mechanisms of emotion-cognition interaction. We used an emotional Flanker task paired with EEG/FEM beamforming in a large cohort (N=121) of healthy human participants, obtaining high temporal and fMRI-equivalent spatial resolution. Spatially, emotion and cognition processing overlapped in the right inferior frontal gyrus (rIFG), specifically in pars triangularis. Temporally, emotion and cognition processing overlapped during the transition from emotional to cognitive processing, with a stronger interaction in β-band power leading to worse behavioral performance. Despite functionally segregated subdivisions in rIFG, frequency-specific information flowed extensively within IFG and top-down to visual areas (V2, Precuneus) – explaining the behavioral interference effect. Thus, for the first time we here show the neural mechanisms of emotion-cognition interaction in space, time, frequency and information transfer with high temporal and spatial resolution, revealing a central role for β-band activity in rIFG. Our results support the idea that rIFG plays a broad role in both inhibitory control and emotional interference inhibition as it is a site of convergence in both processes. Furthermore, our results have potential clinical implications for understanding dysfunctional emotion-cognition interaction and emotional interference inhibition in psychiatric disor-ders, e.g. major depression and substance use disorder, in which patients have difficulties in regulating emotions and executing inhibitory control.
Improved integration of single cell transcriptome data demonstrated on heart failure in mice and men
(2023)
Biomedical research frequently uses murine models to study disease mechanisms. However, the translation of these findings to human disease remains a significant challenge. In order to improve the comparability of mouse and human data, we present a cross-species integration pipeline for single-cell transcriptomic assays.
The pipeline merges expression matrices and assigns clear orthologous relationships. Starting from Ensembl ortholog assignments, we allocated 82% of mouse genes to unique orthologs by using additional publicly available resources such as Uniprot, and NCBI databases. For genes with multiple matches, we employed the Needleman-Wunsch global alignment based on either amino acid or nucleotide sequence to identify the ortholog with the highest degree of similarity.
The workflow was tested for its functionality and efficiency by integrating scRNA-seq datasets from heart failure patients with the corresponding mouse model. We were able to assign unique human orthologs to up to 80% of the mouse genes, utilizing the known 17,492 orthologous pairs. Curiously, the integration process enabled the identification of both common and unique regulatory pathways between species in heart failure.
In conclusion, our pipeline streamlines the integration process, enhances gene nomenclature alignment and simplifies the translation of mouse models to human disease. We have made the OrthoIntegrate R-package accessible on GitHub (https://github.com/MarianoRuzJurado/OrthoIntegrate), which includes the assignment of ortholog definitions for human and mouse, as well as the pipeline for integrating single cells.
Complexome profiling (CP) is a powerful tool for systematic investigation of protein interactors that has been primarily applied to study the composition and dynamics of mitochondrial protein complexes. Here, we further optimised this method to extend its application to survey mitochondrial DNA- and RNA-interacting protein complexes. We established that high-resolution clear native gel electrophoresis (hrCNE) is a better alternative to preserve DNA- and RNA-protein interactions that are otherwise disrupted when samples are separated by the widely used blue native gel electrophoresis (BNE). In combination with enzymatic digestion of DNA, our CP approach improved the identification of a wide range of protein interactors of the mitochondrial gene expression system without compromising the detection of other multi-protein complexes. The utility of this approach was particularly demonstrated by analysing the complexome changes in human mitochondria with impaired gene expression after transient, chemically-induced mtDNA depletion. Effects of RNase on mitochondrial protein complexes were also evaluated and discussed. Overall, our adaptations significantly improved the identification of mitochondrial DNA- and RNA-protein interactions by CP, thereby unlocking the comprehensive analysis of a near-complete mitochondrial complexome in a single experiment.
RBFOX1 is a highly pleiotropic gene that contributes to several psychiatric and neurodevelopmental disorders. Both rare and common variants in RBFOX1 have been associated with several psychiatric conditions, but the mechanisms underlying the pleiotropic effects of RBFOX1 are not yet understood. Here we found that, in zebrafish, rbfox1 is expressed in spinal cord, mid- and hindbrain during developmental stages. In adults, expression is restricted to specific areas of the brain, including telencephalic and diencephalic regions with an important role in receiving and processing sensory information and in directing behaviour. To investigate the effect of rbfox1 deficiency on behaviour, we used rbfox1sa15940, a rbfox1 loss-of-function line. We found that rbfox1sa15940 mutants present hyperactivity, thigmotaxis, decreased freezing behaviour and altered social behaviour. We repeated these behavioural tests in a second rbfox1 loss-of-function line with a different genetic background, rbfox1del19, and found that rbfox1 deficiency affects behaviour similarly in this line, although there were some differences. rbfox1del19 mutants present similar thigmotaxis, but stronger alterations in social behaviour and lower levels of hyperactivity than rbfox1sa15940 fish. Taken together, these results suggest that rbfox1 deficiency leads to multiple behavioural changes in zebrafish that might be modulated by environmental, epigenetic and genetic background effects, and that resemble phenotypic alterations present in Rbfox1-deficient mice and in patients with different psychiatric conditions. Our study thus highlights the evolutionary conservation of rbfox1 function in behaviour and paves the way to further investigate the mechanisms underlying rbfox1 pleiotropy on the onset of neurodevelopmental and psychiatric disorders.
Das schnelle und unkontrollierte Wachstum von Tumorzellen bedingt beim Glioblastom ein heterogenes Tumormikromilieu, mit lokalem Sauerstoff- und Nährstoffmangel. Lokaler Selektionsdruck bedingt eine Evolution besonders anpassungsfähiger Klone. Die integrierte Stressantwort (integrated stress response, ISR) ist ein zelluläres Programm, das durch zahlreiche Stressoren, wie endoplasmatische Retikulum Stress (ER-Stress), durch die Akkumulation ungefalteter Proteine, Hypoxie, Glukose- oder Aminosäuremangel aktiviert wird. Ein zentraler Schritt zur Aktivierung der ISR ist die Phosphorylierung der alpha Untereinheit des eukaryotischen Translationsinitiationsfaktors 2 (eIF2α) an Serin 51. Die Phosphorylierung von eIF2α führt zur Modulation der Translation mit Induktion des Transkriptionsfaktors ATF4 (Activating Transcription Factor 4), der dann zelluläre Anpassungsvorgänge einleitet.
Unsere Hypothese lautete, dass ATF4-vermittelte molekulare Anpassungsmechanismen menschlicher Glioblastom (GB)-Zellen an die Bedingungen der Tumormikroumgebung (wie z.B. Hypoxie und Nährstoffentzug) maßgeblich zur Therapieresistenz beitragen und auch die Empfindlichkeit gegen TMZ-Chemotherapie beeinflussen. Somit könnte eine Inhibition der integrierten Stressantwort über den zentralen Mediator ATF4 zu einem gesteigerten Ansprechen auf Therapiebedingungen führen.
Um die ISR und ATF4 als mögliche therapeutische Angriffspunkte im Glioblastom zu evaluieren, wurde die ATF4 Induktion in Glioblastomzellen pharmakologisch und genetisch moduliert und im Zusammenhang mit TMZ-Behandlung sowie Glukose- und Sauerstoffentzug untersucht. Unter Glutaminentzug, Hypoxie und TMZ-Behandlung, welche Aspekte der GB-Mikroumgebung widerspiegeln, zeigten sich erhöhte ATF4 Proteinspiegel. ATF4-gensupprimierte GB-Zellen (ATF4sh) exprimierten unter gleicher Behandlung wesentlich weniger ATF4.
Im Einklang mit der Hypothese, dass ATF4 zur Therapieresistenz humaner Glioblastomzellen beiträgt, waren ATF4-gensupprimierte GB-Zellen (ATF4sh) im Vergleich zur Kontrollzelllinie empfindlicher gegen Hypoxie-induzierten Zelltod und zeigten einen erhöhten Sauerstoffverbrauch. Umgekehrt zeigten GB-Zellen nach pharmakologischer ISR Induktion einen verminderten Sauerstoffverbrauch. Auch nach Behandlung mit TMZ war die Überlebensrate in ATF4sh Zellen im Vergleich zur Kontrollgruppe geringer. Zur Hemmung der ISR wurden verschiedenen Inhibitoren der Kinase PERK (Protein kinase R-like endoplasmic reticulum kinase) entwickelt. In unseren Untersuchungen war nach der Behandlung der GB-Zelllinien eine verminderte ATF4 Expression festzustellen. Dabei kam es allerdings gleichzeitig bei der Behandlung mit höheren Inhibitorkonzentrationen zu einer Induktion von ATF4. Für den PERK-Inhibitor GSK 414 wurde in der Literatur auch die Hemmung anderer Kinasen wie KIT und RIPK1 gezeigt. Daher konnte bei den Konzentrationen, die für eine vollständige PERK-Inhibition erforderlich waren, keine selektive Hemmung von PERK mehr gewährleistet werden. Besonders aufgrund ihrer Toxizität auf die Funktion des Pankreas eignen sich diese Inhibitoren nicht für eine in vivo Erprobung. Da aber durch die Inhibition der ISR eine neuroprotektive Wirkung beschrieben ist, besteht die Notwendigkeit, weitere Inhibitoren zur Hemmung der ISR zu entwickeln. ISRIB (Integrated Stress Response Inhibitor) ist ein partieller ISR Inhibitor, der eIF2B angreift, was als Guanidin-Nukleotid-Austauschfaktor im Translationsinitiationsprozess benötigt wird. Für ISRIB wurde bereits in vitro und in vivo eine neuroprotektive, aber keine toxische Wirkung beschrieben.
Zusammenfassend lieferten unsere Untersuchungen Hinweise auf die wichtige Rolle von ATF4 für die Anpassung humaner GB-Zellen an Bedingungen der Tumormikroumgebung und für die Entstehung von TMZ-Resistenzen. Die Hemmung der ISR in GB-Zellen könnte daher ein vielversprechender Therapieansatz sein.
Recent findings indicate that visual feedback derived from episodic memory can be traced down to the earliest stages of visual processing, whereas feedback stemming from schema-related memories only reach intermediate levels in the visual processing hierarchy. In this opinion piece, we examine these differences in light of the 'what' and 'where' streams of visual perception. We build upon this new framework to propose that the memory deficits observed in aphantasics might be better understood as a difference in high-level feedback processing along the ‘what’ stream, rather than an episodic memory impairment.
Hintergrund: Die Aortenklappenstenose stellt in Europa und Nordamerika das häufigste Klappenvitium dar und ist vor allem auf eine degenerative Genese zurückzuführen. Da das Auftreten erster Symptome mit einer schlechten Prognose assoziiert ist, ist die transfemorale Aortenklappenimplantation mittels Katheter (TAVI) als minimalinvasive Therapie schon seit längerem eine Alternative zum operativen Ersatz der Aortenklappe und aktuelles Thema der Forschung. Zwar existiert eine Vielzahl an Transkatheterklappen und es werden fortlaufend neue Generationen entwickelt, allerdings liegt bislang noch keine Studie vor, die einen direkten Vergleich der intraannularen Portico-Prothese (Abbott) mit der ebenfalls selbstexpandierbaren, aber supraannularen, Symetis-Prothese (Boston Scientific) präsentiert.
Methoden: Es erfolgte eine retrospektive Analyse von 142 gematchten (nach Alter, BMI, NYHA-Klasse, EuroScore, insulinpflichtiger Diabetes Mellitus, arterielle Hypertonie, COPD, KHK, präinterventionelle eGFR, cAVK, Schlaganfall, TIA in der Vorgeschichte) Patienten je Klappenmodell im medianen Alter von 83 Jahren, die sich mit einer hochgradigen symptomatischen Aortenklappenstenose im Zeitraum vom 12.10.2015 bis zum 07.01.2020 einer transfemoralen TAVI im Universitätsklinikum in Frankfurt am Main unterzogen. Untersucht wurde als primärer Endpunkt die Gesamtmortalität nach 1 Jahr. Darüber hinaus wurden mittels multivariater Cox-Regression unabhängige Risikofaktoren identifiziert. Als sekundäre Endpunkte wurden Komplikationen innerhalb von 30 Tagen gemäß den Definitionen des Valve Academic Research Consortium (VARC) 2 gewählt wie die Implantationen neuer Schrittmacher, paravalvuläre Leckage, Gefäßkomplikationen und akutes Nierenversagen. Analysiert wurden außerdem prozedurale Faktoren, die Symptomatik anhand der NYHA-Klasse sowie einige Laborparameter vor und nach der TAVI.
Ergebnisse: In dieser Arbeit konnte gezeigt werden, dass die 1-Jahres-Mortalität mit der Portico-Prothese signifikant höher ist als mit der Symetis-Prothese (25,2% vs. 12,2%; p=0,011). Dabei gelten neben der Portico-Prothese eine reduzierte linksventrikuläre Funktion und die NYHA-Klassen III/IV gemäß multivariater Cox-Regressionsanalyse als unabhängige Risikofaktoren. Postinterventionell war in der Portico-Kohorte ein neuer Linksschenkelblock (34,5% vs. 23,2%; p=0,036), die Implantation neuer Schrittmacher (22,6% vs. 11,8%; p=0,011) sowie ein akutes Nierenversagen (25,5% vs. 12,8%; p=0,006) signifikant häufiger. Hinsichtlich prozedurbezogener Faktoren hat sich herausgestellt, dass mit der Symetis-Prothese häufiger nachdilatiert (41,5% vs. 25,3%; p=0,004), mit der Portico-Prothese hingegen häufiger vordilatiert (92,2% vs. 82,3%; p=0,012) wurde. Außerdem wurde in der Portico-Kohorte signifikant mehr Kontrastmittel eingesetzt und das Verfahren mit der Durchleuchtung dauerte signifikant länger. Echokardiographisch resultierte post TAVI mit der Symetis-Prothese eine signifikant andere bzw. günstigere Verteilung der Aortenklappeninsuffizienzgrade. Laborchemisch war der Wert für NT-proBNP als biochemischer Marker für eine Herzinsuffizienz signifikant höher als in der Symetis-Gruppe.
Schlussfolgerung: Diese Arbeit zeigte eine signifikant höhere Mortalität nach 1 Jahr mit der Portico-Prothese im direkten Vergleich mit der Symetis-Prothese. Außerdem ergab der Vergleich signifikant höhere Komplikationsraten in der Portico-Kohorte hinsichtlich Schrittmacherimplantationen, neuem Linksschenkelblock und akutem Nierenversagen. Weitere Studien sollten die beiden Prothesen im längerfristigen Verlauf vergleichend analysieren. Die Ergebnisse dieser Studie können zur Optimierung neuer Klappengenerationen beitragen, indem sie auf potenziell prognosebestimmende Aspekte des Designs und der Implantationstechnik aufmerksam machen. Außerdem sensibilisert die Studie für eine individuell für jeden Patienten angepasste Prothesenauswahl. Möglicherweise sollte bei Vorerkrankungen der Niere oder bei vorbekannten Herzleitungsstörungen die Symetis- gegenüber der Portico-Prothese vorgezogen werden.
Resistenzen gegenüber Carbapenemen sind eine Bedrohung für die globale Gesundheit mit wenigen verbleibenden Therapieoptionen. Ceftazidim/Avibavtam (CZA) ist die Kombination aus einem Cephalosporin und einem Diazabicyclooctan, mit der Eigenschaft eine Vielzahl von Carbapenemasen der Ambler Klasse A und D zu inhibieren. Resistenzen gegenüber Carbapenemen in gramnegativen Bakterien sind in Kolumbien und anderen Ländern Lateinamerikas weit verbreitet. In den hier vorgestellten Arbeiten wurden 2.235 Enterobakterien und 492 P. aeruginosa Isolate aus fünf Lateinamerikanischen Ländern auf ihre Empfindlichkeit gegenüber CZA und anderen klinisch verfügbaren Antibiotika untersucht. Die CZA-resistenten Isolate wurden mittels PCR und Genomsequenzierung auf die zugrundeliegenden Resistenzmechanismen hin analysiert. CZA zeigte Aktivitäten gegenüber 99,2% (2.217/2.235) aller untersuchten Enterobacterales und 77,8% (383/492) aller P. aeruginosa Isolate. Als plausible Erklärung für die Resistenz gegen CZA konnte mittels qPCR bei allen Enterobakterien und bei 38,5% (42/109) der P. aeruginosa Isolate ein Metallo-β-Laktamase (MBL)-kodierendes Gen nachgewiesen werden. Die verbleibenden P. aeruginosa Isolate wurden einer Genomsequenzierung unterzogen, dabei zeigten sich Mutationen in Genen, die zuvor mit einer verringerten Empfindlichkeit gegen CZA assoziiert wurden, wie z.B. Genen die mit der Überexpression von MexAB-OprM und AmpC (PDC) in Verbindung stehen, sowie Genen, die PoxB (blaOXA-50-like), FtsI (PBP3), DacB (PBP4) und OprD kodieren. Unsere Ergebnisse unterstreichen die Notwendigkeit von Therapieoptionen gegenüber MBL-produzierenden und anderen Carbapenem-resistenten Mikroorganismen. Des Weiteren sind diese Studien eine Momentaufnahme der Empfindlichkeit gegen CZA vor dessen Verfügbarkeit in Lateinamerika und dienen deswegen als Ausgangspunkt um die Entwicklung von Resistenzen in dieser Region zu verfolgen.
Hintergrund: Der Hypoparathyreoidismus (Hypopara) ist neben der Recurrensparese eine typische postoperative Komplikation nach Thyreoidektomie. Ziel dieser Arbeit soll die Prozessoptimierung des postoperativen Managements sein, um einen p.o. Hypopara frühzeitig zu erkennen und zu therapieren und somit die klinischen Symptome zu lindern oder zu vermeiden.
Methoden: Es wurden alle Patienten mit einer beidseitigen Schilddrüsenresektion eingeschlossen. Ausschlusskriterien waren simultane Nebenschilddrüsen- erkrankungen sowie fortgeschrittene Schilddrüsenmalignome mit geplantem Tumordebulking und/oder langem ITS-Aufenthalt. Postoperativ wurden Parathormon (EDTA) sowie Kalzium (Serum) bestimmt. Bei einem Parathormon (PTH) - Wert unter dem Referenzbereich (15,0-68,3 pg/ml) und/oder einer ausgeprägten Hypokalzämie mit einem Kalziumwert < 1,9 (Ref. 2,20-2,65 mmol/l) und/oder klinischen Zeichen wie Kribbelparästhesien oder Tetanie wurde Kalzium und Vitamin D mittels festem Schema verordnet. Die Symptombesserung wurde klinisch dokumentiert.
Ergebnisse: Am AGAPLESION Elisabethenstift gGmbH in Darmstadt wurden im Zeitraum zwischen Januar 2019 und Juni 2022 Schilddrüseneingriffe bei insgesamt 465 Patienten durchgeführt. Nach Berücksichtigung der Ein- und Ausschlusskriterien wurden 193 Patienten mit Thyreoidektomie in die Auswertung einbezogen. Ein p.o. Hypopara wurde bei 51 Patienten (26,4 %) festgestellt. Bei 40 Patienten (20,7 %) traten Symptome auf (39x Kribbelparästhesie, 1xTetanie). Von den 51 Patienten lag bei 26 (51 %) ein nur leicht erniedrigter Kalziumwert am 1. p.o. Tag vor (zwischen 2,00 und 2,20 mmol/l), bei 10 Patienten (19,6 %) war der Kalziumwert im Normbereich (2,20-2,65 mmol/l). Im Vergleich dazu lag bei 6 von 51 Patienten (11,8 %) ein normwertiger PTH-Wert vor. Bei 20 Patienten (10,4 %) erfolgte intraoperativ eine Nebenschilddrüsen-Replantation in den ipsilateralen M. sternocleidomastoideus. Davon trat bei 8 Patienten (40 %) ein Hypopara auf. Bei 29 Patienten (15 %) wurde in der Histologie ein akzidentiell mitentferntes Epithelkörperchen nachgewiesen. Davon trat bei 13 Patienten (44,8 %) ein Hypopara auf. Die mittlere Zeit nach OP zur PTH-Bestimmung lag bei 2,41 Tagen. Die mittlere Aufenthaltsdauer der Patienten mit Hypopara betrug 3,86 Tage (± 2,272), die der restlichen Patienten betrug 2,69 Tage (± 1,759), p < 0,001.
Schlussfolgerungen: Die PTH-Bestimmung ist neben der klinischen Visite essentiell zur Früherkennung eines p.o. Hypopara. Eine mehrtägige Kalziumbestimmung ist damit nicht zwingend erforderlich, sodass die Verweildauer verkürzt werden kann. Das verordnete Schema zur oralen Substitution von Kalzium und Vitamin D ist auch ambulant fortführbar. Die Replantation einer nicht erhaltbaren NSD hat bei 60 % einen Hypopara verhindert. Die gezielte Darstellung und Erhalt der NSD sollte bei jedem Eingriff eingehalten werden. Insgesamt zeigt diese Arbeit den höheren Stellenwert des postoperativen PTH-Wertes sowie der klinischen Zeichen als das Serumkalzium zur Erkennung und Therapie des Hypopara nach Thyreoidektomie.
MutLα is essential for human DNA mismatch repair (MMR). It harbors a latent endonuclease, is responsible for recruitment of process associated proteins and is relevant for strand discrimination. Recently, we demonstrated that the MMR function of MutLα is regulated by phosphorylation of MLH1 at serine (S) 477. In the current study, we focused on S87 located in the ATPase domain of MLH1 and on S446, S456 and S477 located in its linker region. We analysed the phosphorylation-dependent impact of these amino acids on DNA binding, MMR ability and thermal stability of MutLα. We were able to demonstrate that phosphorylation at S87 of MLH1 inhibits DNA binding of MutLα. In addition, we detected that its MMR function seems to be regulated predominantly via phosphorylation of serines in the linker domain, which are also partially involved in the regulation of DNA binding. Furthermore, we found that the thermal stability of MutLα decreased in relation to its phosphorylation status implying that complete phosphorylation might lead to instability and degradation of MLH1. In summary, we showed here, for the first time, a phosphorylation-dependent regulation of DNA binding of MutLα and hypothesized that this might significantly impact its functional regulation during MMR in vivo.
Die kathetergestützte Thrombektomie ist, spätestens seitdem 2015 verschiedene Studien ihre Überlegenheit zur alleinigen medikamentösen Behandlung gezeigt haben, die bevorzugte Therapie bei Patienten mit akutem ischämi-schem Schlaganfall und embolischen Verschluss einer großen intrakraniellen Arterie. Obwohl die mechanische Thrombektomie mittlerweile zur Standardthe-rapie zählt, ist der Zusammenhang zwischen Lokalisation des Infarktareals und klinischem Behandlungsergebnis nach Thrombektomie bisher nicht gut untersucht. Die dieser Studie zugrunde liegende Hypothese war, dass Infarktdemar-kationen in der zentralen Corona radiata, Capsula interna und/oder den Ba-salganglien aufgrund einer potenziellen Schädigung der Fasern des Tractus corticospinalis mit einem schlechten Behandlungsergebnis (mRS 3 bis 6) nach mechanischer Thrombektomie assoziiert sind. Ziel dieser Studie war es somit, den Behandlungserfolg nach Thrombektomie bei Patienten mit entsprechender Infarktlokalisation zu untersuchen.
Hierfür wurden die Daten von 70 erwachsenen Patienten analysiert, die im Zeitraum von April 2016 bis Januar 2020 im Institut für Neuroradiologie des Universitätsklinikums Frankfurt aufgrund eines ischämischen Infarktes mit entsprechender Infarktdemarkation eine mechanische Thrombektomie erhalten haben. Alle erhobenen Daten stammen aus der elektronischen Krankenakte, dem Radiologie-Informations-System oder einem prospektiven Register zur internen Qualitätssicherung. Es erfolgte außerdem eine Unterteilung der Studi-enkohorte anhand des zusätzlichen kortikalen Infarktausmaßes bzw. der kortikalen Infarktlokalisation, um den Einfluss kortikaler Infarkte auf das Behandlungsergebnis beurteilen zu können. Die wichtigsten Endpunkte der Studie waren das klinische Behandlungsergebnis gemessen anhand der mRS nach 90 Tagen sowie die Ergebnisse der Subgruppenanalyse.
51,4 % der Studienpopulation erzielten nach 90 Tagen ein gutes klinische Be-handlungsergebnis (mRS 0 bis 2), 32,9 % der Patienten erreichten sogar ein exzellentes Ergebnis (mRS 0 bis 1). Insgesamt verstarben innerhalb von 90 Tagen nach dem Schlaganfallereignis 15,7 % aller Patienten und 32,9 % konn-ten nur ein schlechtes Behandlungsergebnis (mRS 3 bis 5) erzielen. Die Ergebnisse zeigen, dass die in der routinemäßig angefertigten Bildgebung nachgewiesenen Infarktdemarkationen im Verlauf der langen Bahnen nicht zwingend ein schlechtes Behandlungsergebnis bedingen. Bei Patienten mit ausge-dehnter Beteiligung des Kortex und Infarkten in definierten eloquenten Arealen waren die klinischen Behandlungsergebnisse allerdings schlechter als in der Vergleichsgruppe mit isolierten Läsionen der langen Bahnen.
Um künftig ein besseres Verständnis darüber zu erlangen, welche Patienten mit bestimmter Infarktlokalisation von einer mechanischen Thrombektomie langfristig profitieren können, sind weitere prospektive Studien mit exakt definierten Vergleichsgruppen und höherwertiger MRT-basierter Bildgebung erforderlich.
Im Rahmen der Versorgung von polytraumatisierten (schwerstverletzten) Patienten ist insbesondere die systemische Inflammation zu beachten. Durch das initiale Trauma (“first hit“) kommt es zu einer systemischen Dysregulation der inflammatorischen Kaskaden, wobei sowohl eine überschießende (SIRS/Sepsis) wie auch unterschießende Reaktion (CARS) zu schweren Komplikationen wie Multiorganversagen bis hin zum Tod führen kann. Die notfallmässige chirurgische Versorgung fügt durch multiple Faktoren wie Weichteilverletzung, Blutverlust und Intubation dem Patienten einen “second hit“ zu, welcher sich auf den “first hit“ aufsummieren und besagte Komplikationen induzieren kann. Aufgrund dessen wurden verschiedene Therapiekonzepte entwickelt wie beispielsweise die “Damage control surgery“, welche durch minimalinvasive Techniken die notfallmässig versorgungsbedürftigen Verletzungen temporär stabilisiert/versorgt, bis der Patient sich physiologisch stabilisiert und definitiv versorgt werden kann. Eine weitere Strategie stellt die „Safe Definitive Surgery“ dar, welche eine Synopsis bildet aus zu einen frühzeitiger definitiver Versorgung gepaart mit minimalinvasiven Techniken, um während der Operation multipler Frakturen intraoperativ anhand der Physiologie des Patienten regelmäßig zu reevaluieren und daran zu adjustieren.
Bei der definitiven Versorgung von langen Röhrenknochen im Schaftbereich werden klinisch standardmässig Marknägel verwendet. Hierbei eröffnet man den langen Röhrenkochen am proximalen Eintrittspunkt, bohrt den Knochen intramedullär mittels “Reamer“ auf und führt den Nagel ein, welchen man mittels Schrauben multidimensional in der Corticalis verriegelt. Hierbei stellt die intramedulläre Aufbohrung den kritischsten Schritt dar, da hierbei zum einen Knochenmark austritt und durch den Bohrer Thermonekrosen im Knochen auftreten können sowie auch Knochenpartikel austreten. Um diese Nachteile zu beheben, wurde der “Reamer-Irrigator-Aspirator“ (RIA) entwickelt, welcher nebst der klassischen Bohrfunktion noch eine Spül-Saugfunktion innehat und somit parallel intramedullär eine Kühlung herbeiführt, wie auch das Knochenmark nebst Knochenpartikeln absaugt. Hiervon gibt es eine ältere (RIA 1) und eine neuere (RIA 2) Version, wobei sich diese geringfügig in Grösse des Bohrkopfes und der Saugfunktion wie auch im Handling unterscheiden. Wenig ist jedoch zum aktuellen Zeitpunkt bekannt, welche Auswirkungen diese unterschiedlichen Versionen verglichen mit dem konventionellen “Reamer haben“. Um dies näher zu evaluieren, wurde ein standardisiertes Polytrauma-Modell an 30 Schweinen (Sus scrofa) durchgeführt. Unter konstanter Analgesie wurde nach Erreichen einer standardisierten Baseline an 24 der Tiere ein Polytrauma, bestehend aus unilateraler Femurfraktur, stumpfem Thoraxtrauma inklusive Leberlazeration und hämorrhagischem Schock ausgeübt. Sechs Tiere fungierten als Kontrollgruppe (sham), welche kein Trauma sowie Therapie erhielten, aber sonst gleich behandelt wurden. Die polytraumatisierten Tiere erhielten Therapie nach Schockraum- und ATLS Versorgung nach dem Trauma. Bestehend aus “Abdominal Packing“, Kreislaufstabilisierung und Versorgung der Femurfraktur mittels intramedullärer Nagelung. Die 24 polytraumtisierten Versuchstiere wurden bezüglich der Versorgung der Femurfraktur in drei Gruppen aufgeteilt: 1) Konventionelles Reaming, 2) RIA 1 und 3) RIA 2. An sechs Zeitpunkte (t1 (-1.5h) - t6 (6h)) über 7.5 Stunden erfolgten regelmäßige Blut- wie Urinentnahmen und eine bronchoalveoläre Lavage vor fachgerechtem Exitus am letzen Zeitpunkt. Anschließend wurde mittels ELISA in besagten Proben das Interleukin-6, Interleukin-8, Interleukin-10 und Tumornekrosefaktor-alpha bestimmt und statistische Unterschiede zwischen den Gruppen ermittelt.
Die Ergebnisse legen nahe, dass die Verwendung des Reamer-Irrigator-Aspirator Typ 2 aufgrund spezifischer Modifikationen verglichen mit seinem Vorgänger (RIA Typ 1) eine geringere inflammatorische Immunantwort aufweist. Verglichen mit dem konventionellen Reaming konnte in unserer Versuchsreihe in Hinblick auf entzündliche Mediatoren systemisch wie lokal kein Unterschied zu der Versorgung mittels RIA aufgezeigt werden. Jedoch präsentierte sich bei der Benutzung des konventionellen Reamers auch in unserer Versuchsreihe das Auftreten einer Fett/Lungenembolie, was bereits in der Literatur als eine gängige Komplikation dieses Instrumentariums beschrieben wird. Zusammenfassend ist der Reaming-Irrigator-Aspirator eine modernisierte Version des konventionellem Reamers, welcher multiple Vorteile aufweist, jedoch im Rahmen der Kostensenkung wahrscheinlich erst im weiteren zeitlichen Verlauf regelmäßige Anwendung in der Klinik finden wird.
Einleitung: Frailty (engl. für Gebrechlichkeit) bezeichnet eine mit hohem Alter zunehmende Verschlechterung des körperlichen und kognitiven Zustandes von Individuen, woraufhin der Körper nicht mehr in der Lage ist, adäquat auf äußere und innere Stressoren zu reagieren. Frailty ist mit einer erhöhten Morbiditäts- und Mortalitätsrate sowie längerer Krankenhausverweildauer und erhöhter postoperativer Komplikationsrate verbunden und stellt folglich einen chirurgischen Risikofaktor dar.
Problemstellung: Die Relevanz eines strukturierten Frailty Assessments in der präoperativen Risikostratifizierung führte zur Indikationsstellung, diverse validierte Risk Assessment Tools auf ihre prädiktive Vorhersagekraft bezüglich des Auftretens von postoperativen Komplikationen und postoperativer Sterbewahrscheinlichkeit zu untersuchen.
Methoden: In die vorliegende Studie wurden Patienten, die in dem Zeitraum vom 01.09.2018 und 31.01.2019 in der allgemeinchirurgischen Ambulanz vorstellig waren und einen allgemeinchirurgischen Eingriff erhielten, aufgenommen. Mittels Fragebögen wurden die Scores „Risk Analysis Index“, „Edmonton Frail Scale“ sowie „Charlson Comorbidity Index“ präoperativ erhoben und retrospektiv mit Daten aus der digitalen Patientenakte zusammengeführt. Endpunkte waren die 90-Tages- Mortalität sowie das Auftreten von schweren postoperativen Komplikationen ab Clavien Dindo Grad 3b. Die Analyse erfolgte in SPSS mittels Chi-Quadrat Test, t- Test und ROC-Kurven Analysen.
Ergebnisse: Das durchschnittliche Alter der Studienkohorte lag bei 56 ± 15.9 Jahren und der Anteil männlicher Patienten überwog mit 59.2% (n=282).
Die Fragebögen wurden 739 Patienten vorlegt und 476 Patienten konnten in die Datenanalyse eingeschlossen werden. Die 90-Tages-Mortalität lag bei 2.7% (n=13) und 9% (n=43) erlitten schwere postoperative Komplikationen ab Clavien-Dindo Grad IIIb. Die Einteilung nach der ASA-Klassifikation (p=0.024), maligne Diagnosen -7-(p<0.001) und Majorkomplikationen (p<0.001) stellten präoperative Risikofaktoren für postoperative 90-Tage-Mortalität dar. Von den Risk Assessment Scores zeigte lediglich der Risk Analysis Index eine signifikante Korrelation auf (p=0.013). Ein mittels ROC-Analyse ermittelter Cut-Off Wert von 23 klassifizierte 166 (34.9%) Patienten als frail, die mit 69% Sensitivität und 66% Spezifität (AUC=0.735) ein erhöhtes Risiko für postoperatives Versterben innerhalb von 90 Tagen aufwiesen (p=0.008). Risikofaktoren für das Auftreten schwerer postoperativer Komplikationen waren die ASA-Klassifikation (p=0.041), längere Krankenhausverweildauer (p<0.001) und maligne Diagnosen (p<0.001). Der Charlson Comorbidity Index (p=0.031) und RAI-C Werte ≥ 23 (p<0.001) korrelierten signifikant mit Majorkomplikationen. Das Alter ab 65 Jahren stellte mit 77 % Spezifität und 69 % Sensitivität ebenfalls einen prädiktiven Risikofaktor für postoperative Mortalität dar (AUC=0,787).
Schlussfolgerung: Mithilfe validierter Risk Assessment Tools ist es möglich Patienten, die ein erhöhtes Risiko für postoperative negative Ereignisse aufweisen, bereits präoperativ zu erkennen. Dies ermöglicht eine bessere Beurteilung der chirurgischen Indikationsstellung sowie das rechtzeitige Ergreifen von risikominimierenden Maßnahmen. Es ist notwendig die Ergebnisse dieser Arbeit künftig mit risikominimierenden Maßnahmen zu verknüpfen und zu untersuchen, ob die Implementierung der Risk Assessment Tools zu verbesserten postoperativen Ergebnissen führt, wenn modifizierbare Faktoren verbessert werden.
In den letzten Jahren haben sich die Therapiemöglichkeiten des Mammakarzinoms deutlich verbessert. Durch die Analyse von genetischen Veränderungen in den Tumorzellen oder in der Keimbahn ist eine zielgerichtete Tumortherapie bei einigen Subgruppen möglich; z.B. mit PARP- und PIK3CA-Inhibitoren.
In einer retrospektiven Analyse wurde in dieser Arbeit untersucht, wie genetische Mutationsanalysen in einer onkologischen Schwerpunktpraxis eingesetzt werden. Es sollte untersucht werden, wie häufig PatientInnen in einer onkologischen Praxis mit metastasiertem Mammakarzinom eine Mutationsanalyse brustkrebsassoziierter Gene erhalten haben, und welche Konsequenzen daraus gezogen wurden. Dabei wurde der Zeitraum von 2019 – 2022 betrachtet. Mithilfe der Software Albis wurden Daten von 49 PatientInnen identifiziert. 40 PatientInnen haben eine Keimbahndiagnostik der Gene BRCA1/2 erhalten. Von den PatientInnen, die die BRCA1/2-Analyse bekommen haben, konnten in 20% der PatientInnen eine Mutation in BRCA1 oder 2 detektiert werden. Bei den meisten dieser PatientInnen wurde der PARP Inhibitor Olaparib therapeutisch eingesetzt. 10 PatientInnen erhielten eine PIK3CA-Analyse, 9 von ihnen mittels PCR und eine mittels NGS. In dieser Gruppe wurde bei einer Patientin eine Mutation im PIK3CA-Gen ermittelt. 15 PatientInnen haben eine Multigenpanel-Diagnostik erhalten. Dabei ist eine Reihe weiterer genetischer Veränderungen nachgewiesen worden. Für einige dieser Veränderungen stehen therapeutische Möglichkeiten zur Verfügung, die zwar nicht für das Mammakarzinom, aber für andere Tumorentitäten bereits zugelassen sind.
Das periinterventionelle Management von antikoagulierten Patienten stellt eine große Herausforderung im klinischen Alltag dar. Die genaue Abwägung von Blutungs- und Thromboembolierisiko ist essentieller Bestandteil der Frage, ob und wann die blutgerinnungshemmende Medikation pausiert werden soll. Ist das Zeitintervall zur geplanten Intervention zu kurz gewählt und daher die antikoagulierende Wirkung der Arzneimittel noch ausgeprägt, kann es leichter zu intra- und postoperativen Blutungen kommen. Umgekehrt kann es bei einer zu langen Unterbrechung der Antikoagulation zur Entwicklung von Thromboembolien kommen. Um diese Risiken zu minimieren und die Patientensicherheit zu verbessern ist ein leitliniengerechtes Handeln von großer Bedeutung. Durch den Einfluss des demographischen Wandels und die steigende Inzidenz der Erkrankungen, die eine Antikoagulation notwendig machen, erhöht sich ebenso die Anzahl der antikoagulierten Patienten, die sich einer elektiven Operation unterziehen müssen, wodurch das Thema schon seit Jahren an Bedeutung gewinnt. Trotz diverser Leitlinien, die in den letzten Jahren publiziert wurden, findet man im klinischen Alltag oftmals nicht auf Anhieb die passende Empfehlung, da diese von dem Einfluss etlicher Risikofaktoren, wie Alter, Geschlecht, Nierenfunktion u.a. bestimmt werden sollte. Der Einsatz eines Clinic Decision Support Systems (CDSS) kann ein leitliniengerechtes Handeln möglicherweise verbessern, indem patientenspezifische Risikokonstellationen anhand europäischer Leitlinien geprüft werden und dem Nutzer eine optimale Vorgehensweise unterbreitet wird.
Zielsetzung: In dieser Arbeit, soll die Eignung eines klinischen Entscheidungs-Unterstützungssystems (CDSS) anhand eines Multiple Choice (MC) Tests mit 11 kliniknahen Fallbeispielen, bezüglich evidenzbasierten perioperativen Managements von antikoagulierten Patienten untersucht werden.
Methoden: Im Rahmen einer klinischen prospektiven randomisierten multizentrischen Simulationsstudie beantworteten Ärztinnen und Ärzte einen Multiple Choice Test bestehend aus 11 Fallbeispielen zum Thema periinterventionelles Management von antikoagulierten Patienten. Dabei sollte zu - 5 - jedem Beispiel zwei möglichst leitliniengerechte Empfehlung ausgewählt werden.
Die Ärztinnen und Ärzte wurden vorab in zwei Gruppen randomisiert. Der PERI-KOAG Gruppe wurde das CDSS zur Beantwortung der Fragen zur Verfügung gestellt. Die Kontroll-Gruppe hatte hingegen keinen Zugriff auf die Applikation und sollte den Test mit frei zugänglichen Hilfsmitteln, zum Beispiel Leitlinien oder anderen allgemein verfügbaren Apps beantworten. Die beiden Gruppen wurden anschließend in Bezug auf die Gesamtergebnisse, die Bearbeitungszeit und Berufserfahrung verglichen.
Ergebnisse: Insgesamt wurden 168 Teilnehmer in die beiden Gruppen randomisiert, wovon 76 Teilnehmer, 42 Teilnehmer der PERI-KOAG Gruppe und 34 Teilnehmer der Kontroll-Gruppe den MC-Test vollständig beendeten und in die weitere Auswertung eingeschlossen wurden. Der MC-Test konnte mit maximal 22 Punkten (=100%) abgeschlossen werden. Die PERI-KOAG Gruppe erreichte dabei im Durchschnitt signifikant bessere Ergebnisse als die Kontroll-Gruppe (82 ±15% vs. 70 ±10%; 18 ±3 vs. 15 ±2 Punkte; P =0,0003). Unter Berücksichtigung der Bearbeitungszeit erzielten Teilnehmer mit längerer Bearbeitung durchschnittlich höhere Ergebnisse, als Kollegen welche den Test schneller abschlossen. Dieser Effekt zeigte sich in beiden Gruppen. Ein signifikanter Unterschied konnte hierbei nur in der PERI-KOAG Gruppe gezeigt werden (PERI-KOAG Gruppe ≥33 min. 89 ±10% (20 ±2 Punkte) vs. <33 min. 73 ±15% (16 ±3 Punkte), P =0,0005). Innerhalb der PERI-KOAG Gruppe zeigten sich tendenziell höhere Ergebnisse innerhalb der erfahreneren Gruppe (>5 Jahre Berufserfahrung), aber keinen signifikanten Unterschied zu weniger (≤5 Jahre Berufserfahrung) erfahrenen Kollegen (87 ±10% (19 ±2 Punkte) vs. 78 ±17% (17 ±4 Punkte), P =0,08). Dagegen konnte in der Kontroll-Gruppe kein Unterschied zwischen den Testresultaten von mehr und weniger erfahrenen Teilnehmern gezeigt werden (>5 Jahre: 71 ±8% (16 ±2 Punkte) vs. ≤5 Jahre: 70 ±13% (15 ±3 Punkte) P =0,66).
Diskussion: Diese Arbeit zeigt, dass im Rahmen eines MC-Tests mit Hilfe des CDSS ein leitliniengerechtes perioperatives Management von antikoagulierten Patienten signifikant verbessert werden kann. Eine fachgerechte Anwendung des Tools ist essentiell, um schwerwiegende Folgen, wie Blutungen oder Thromboembolien zu vermeiden. Eine längere Bearbeitungszeit und mutmaßlich intensivere Nutzung des CDSS, geht mit besseren Ergebnissen einher als eine schnelle Testbearbeitung. Ein insgesamt verbessertes leitliniengerechtes Management zeigt, unabhängig von der Berufserfahrung der Teilnehmer, das große Potential des CDSS.
Hintergrund: Amblyopie ist nach Fehlsichtigkeit die häufigste Sehstörung bei Kindern. Sie ist eine wesentliche Ursache für eine lebenslange Minderung der bestkorrigierten Sehschärfe und ist meist unilateral. Eine Asymmetrie in der Qualität des visuellen Eindrucks während der sensiblen Phase führt in der Regel zu einer unzureichenden Entwicklung des binokularen Sehsystems. Die Standardtherapie der Amblyopie besteht aus optimaler optischer Korrektur vorhandener Brechungsfehler und der direkten Okklusion, wobei das funktionsbessere Auge zeitweise mit einem Augenpflaster abgedeckt wird. Bisherige Studien haben gezeigt, dass besonders bei Patienten mit tiefer Amblyopie, die Therapietreue oft mäßig ist. In einigen Fällen kann das amblyope Auge nicht mit der Foveola fixieren. Diese exzentrische Fixation beeinflusst den Therapieerfolg negativ. Unser Ziel war, bei dieser speziellen Patientengruppe die Okklusionsdauer objektiv zu registrieren und deren Auswirkung auf die Visusentwicklung und die Fixationsänderung in Abhängigkeit vom Alter über einen langen Zeitraum zu untersuchen.
Methoden: In unserer prospektiven multizentrischen Pilotstudie untersuchten wir amblyope Kinder mit exzentrischer Fixation im Alter von 3-16 Jahren während 12-monatiger Okklusionsbehandlung. Der Nahvisus wurde mittels Landoltringen und Lea-Symbolen (jeweils Reihenoptotypen) bestimmt. Die Okklusionsdauer wurde kontinuierlich mit einem TheraMon®-Mikrosensor aufgezeichnet, der am Augenpflaster angebracht wurde. Der Fixationsort am Augenhintergrund wurde mit einem direkten Ophthalmoskop bestimmt. Unsere Ziele waren: Evaluierung der Sehfunktion, Therapieadhärenz und Beurteilung des Fixationsortes des amblyopen Auges. Der Anteil des korrigierten Visusdefizits, die Dosis-Wirkungs-Beziehung und die Therapieeffizienz wurden berechnet.
Ergebnisse: In unserer Studie wurden 12 Patienten mit Schiel- und kombinierter Schiel- und Anisometropieamblyopie im Alter von 2,9-12,4 Jahren (im Mittel 6,5 ± 3,4 Jahre) untersucht. Der Anfangsvisus der amblyopen Augen nach 3 Monaten refraktiver Adaptationsphase lag im Mittel bei 1,4 ± 0,4 logMAR (Spannweite 0,9-2,0), und der 5 Führungsaugen bei 0,3 ± 0,3 logMAR (Spannweite -0,1-0,8). Die mittlere interokuläre Visusdifferenz (IOVAD, Visusunterschied zwischen dem amblyopen Auge und dem Führungsauge) zu Beginn betrug im Mittel 1,1 ± 0,4 log Einheiten (Spannweite 0,5-1,8). Die verschriebene Okklusionsdauer lag im Median bei 7,7 Stunden/Tag (Spannweite 6,6-9,9), die tatsächlich erreichte bei 5,2 Stunden/Tag (Spannweite 0,7-9,7). Nach 12 Monaten betrug die mediane Visusbesserung der amblyopen Augen 0,6 log Einheiten (Spannweite 0-1,6), die mediane IOVAD 0,3 log Einheiten (Spannweite 0-1,8). Multiple Regressionsanalyse mit Rückwärtselimination zeigte, dass sowohl das Alter (p=0,0002) als auch die Okklusionsdosis (p=0,046) signifikante Einflussfaktoren für den Visusanstieg waren. Kinder unter 4 Jahren zeigten das beste Ansprechen mit der niedrigsten Rest-IOVAD (Median 0,1 log Einheiten, Spannweite 0-0,3). Die Effizienzberechnung ergab eine Visusbesserung von etwa einer log Visusstufe pro 100 Stunden Okklusion in den ersten zwei Monaten und einer halben log Visusstufe nach 6 Monaten. Die Therapieeffizienz nahm mit zunehmendem Alter ab (p = 0,01). Trotz einer gewissen Visusbesserung auch bei Patienten im Alter von ≥8 Jahren (Median 0,4 log Einheiten), zeigten diese eine geringere Therapieadhärenz sowie -effizienz (mediane Rest-IOVAD 0,8 log Einheiten). Zentrale Fixation wurde von 9 Patienten nach im Median 3 Monaten erreicht (Spannweite 1-4 Monate). Drei Patienten (>6 Jahre) erreichten keine zentrale Fixation.
Schlussfolgerung: Amblyopie mit exzentrischer Fixation stellt auch bei guter Adhärenz eine Herausforderung für den Therapieerfolg dar. Unsere Studie zeigte erstmals prospektive quantitative Daten basierend auf elektronischer Erfassung der Okklusion bei dieser seltenen Patientengruppe. Es konnte die deutliche Abnahme der Therapieeffizienz mit zunehmendem Alter gezeigt werden. Die Visusbesserung wurde viel stärker vom Alter als von der Okklusionsdosis beeinflusst. Nur Kinder, die zum Okklusionsbeginn jünger als 4 Jahre waren, konnten im Studienzeitraum in ihren amblyopen Augen eine für ihr Alter annähernd normale Sehschärfe und eine IOVAD <0,2 log Einheiten erreichen. Demzufolge sind, trotz möglicher geringer Visusbesserung auch bei älteren Patienten, eine frühzeitige Diagnose und Therapie dieser Patientengruppe unerlässlich für den Therapieerfolg.
Förderung: bereitgestellt durch den Forschungspreis des Vereins „Augenstern e.V.“
In Deutschland existieren nur wenige Ergebnisse aus der klinischen Forschung, die im Kontext der allgemeinmedizinischen Versorgung gewonnen wurden. Dies ist u.a. damit zu begründen, dass Forschung in der Allgemeinmedizin in den Praxisalltag eingebunden sein muss, worauf die gegenwärtige Versorgungsstruktur nicht ausgelegt ist. Damit für Hausärztinnen und Hausärzte Forschung im Praxisalltag möglich ist, müssen also Strukturen geschaffen werden, die Forschung ermöglichen. Eine solche Struktur bieten Forschungspraxennetze (FPN) wie beispielsweise das Forschungspraxennetz „ForN“. ForN wurde vom Institut für Allgemeinmedizin der Goethe-Universität Frankfurt am Main im Jahr 2011 initiiert. In ForN tätige Forschungspraxen können sich mit einer Gültigkeit von fünf Jahren als „akademische Forschungspraxis“ akkreditieren lassen, wenn sie bestimmte Anforderungen erfüllen. Dazu gehört die Teilnahme an für Forschungsprojekte qualifizierenden Fortbildungen oder an Netz-begleitenden Treffen für Ärztinnen, Ärzte und Medizinische Fachangestellte (MFA) sowie die regelmäßige Teilnahme an Forschungsprojekten. Eine Verlängerung der Akkreditierung nach fünf Jahren ist möglich. Bisherige Publikationen über Forschung zu FPN bieten insbesondere Einblicke in Faktoren, welche den Beitritt in ein FPN fördern oder eher behindern. Forschung, die Faktoren der längerfristigen Mitwirkung der Praxen an FPN (wie Austrittsgründe, aber auch Motivation, eine Re-Akkreditierung anzustreben) untersucht, ist im Gegensatz dazu rar.
Diese Dissertation untersucht diese Faktoren anhand der folgenden Fragen: warum traten Forschungspraxen im Laufe der Zeit aus dem FPN ForN aus (ehemalige Mitglieder) und warum strebten andere eine Re-Akkreditierung an (aktive Mitglieder)? Weitere Unterfragen dieser Arbeit sind: welche Faktoren motivierten oder erschwerten hausärztlichen Teams eine Mitwirkung als Forschungspraxis? Wie wurde die bisherige Zusammenarbeit gesehen und als wie gut machbar wurden die Anforderungen zur Erlangung der Bezeichnung „akademische Forschungspraxis“ eingeschätzt?
Es wurde ein Fragebogen für ehemalige ärztliche ForN-Mitglieder entworfen und eingesetzt. Des Weiteren wurden Daten aus Fragebogenerhebungen von aktiven ForN-Mitgliedern (Hausärztinnen, Hausärzte, MFA) aufbereitetet. Die Daten wurden mithilfe der Datenanalysesoftware SPSS deskriptiv unter Angabe der Häufigkeiten, Mittelwerte, Standardabweichungen und Spannweiten ausgewertet.
Es konnten 14 Fragebögen von ehemaligen ärztlichen ForN-Mitgliedern aus 13 Praxen analysiert werden. Von den aktiven ForN-Mitgliedern wurden Fragebögen von 48 Ärztinnen und Ärzten sowie 57 MFA aus 41 Praxen ausgewertet. Als Gründe für den Austritt wurde von ehemaligen Mitgliedern insbesondere Zeitmangel und eine hohe Arbeitsbelastung angegeben. Weitere erschwerende Umstände waren ein Mangel an MFA, eine große Entfernung zum Standort des Instituts für Allgemeinmedizin und persönliche Gründe. Bis auf letztere Angabe waren dies auch die größten Hürden während der Teilnahme, die von aktiven Mitgliedern beschrieben wurden. Einen Beitrag für die Allgemeinmedizin zu leisten, persönliche Kompetenzen und Kompetenzen des Praxisteams zu erweitern sowie Abwechslung im Praxisalltag zu erleben, waren die wichtigsten motivierenden Faktoren einer Teilnahme im Forschungspraxennetz ForN, sowohl für aktive als auch für ehemalige Mitglieder. Die Anforderungen des FPN ForN an die Akkreditierung als Forschungspraxis wurden aus Perspektive der aktiven Mitglieder überwiegend als machbar empfunden. Nur die Umsetzung zusätzlicher, nicht verpflichtender Aktivitäten wurde als schwieriger erfüllbar bewertet. Bezüglich der Zusammenarbeit mit dem Institut für Allgemeinmedizin gaben ehemalige ärztliche ForN-Mitglieder an, eine gute Vorbereitung auf Forschungsaufgaben erfahren zu haben, dem ForN-Team des Instituts für Allgemeinmedizin vertrauen zu können und dass die Kommunikation allgemein gut war.
Gründe für den Austritt aus dem FPN und Hindernisse während der Teilnahme in ForN waren überwiegend externe Faktoren wie Zeitmangel, eine hohe Arbeitsbelastung oder ein Mangel an MFA. Auf diese Faktoren hat das Institut für Allgemeinmedizin keinen direkten Einfluss, es kann lediglich die administrativen Aufgaben innerhalb eines Forschungsprojektes für das Team einer Forschungspraxis so vorstrukturieren, dass sie möglichst gut im Praxisalltag bewältigt werden können. Ein Vergleich mit Publikationen, die sich mit förderlichen und hinderlichen Faktoren eines Beitritts in ein FPN auseinandersetzen, zeigt, dass ähnliche Gründe auch die längerfristige Mitwirkung beeinflussen.
This study investigated the effects of a daily plyometric hopping intervention on running economy (RE) in amateur runners. In a randomized, controlled trial, thirty-four amateur runners (29 ± 7 years, 27 males) were allocated to a control or a hopping exercise group. During the six-week study, the exercise group performed 5 min of double-legged hopping exercise daily. To progressively increase loading, the number of hopping bouts (10 s each) was steadily increased while break duration between sets was decreased. Pre- and post-intervention, RE, peak oxygen uptake (VO2peak), and respiratory exchange ratio (RER) were measured during 4-min stages at three running speeds (10, 12, and 14 km/h). ANCOVAs with baseline values and potential cofounders as cofactors were performed to identify differences between groups. ANCOVA revealed an effect of hopping on RE at 12 km/h (df = 1; F = 4.35; p < 0.05; η2 = 0.072) and 14 km/h (df = 1; F = 6.72; p < 0.05; η2 = 0.098), but not at 10 km/h (p > 0.05). Exercise did not affect VO2peak (p > 0.05), but increased RER at 12 km/h (df = 1; F = 4.26; p < 0.05; η2 = 0.059) and 14 km/h (df = 1; F = 36.73; p < 0.001; η2 = 0.520). No difference in RER was observed at 10 km/h (p > 0.05). Daily hopping exercise is effective in improving RE at high running speeds in amateurs and thus can be considered a feasible complementary training program.
Clinical trial registration German Register of Clinical Trials (DRKS00017373).
Molecular oxygen (O2) is essential for numerous metabolic processes. Not surprisingly, hypoxia and the resulting adaptations play a pivotal role in pathophysiology, e.g., in cancer or in inflammatory diseases. Of note, myeloid cells are known to accumulate in hypoxic regions such as tumor cores or rheumatoid arthritis joints and may contribute to disease progression. While most studies so far concentrated on transcriptional adaptation by the hypoxia-inducible factors (HIF) 1 and 2 under short term hypoxia, prolonged oxygen deprivation and alternative post-transcriptional regulation are rather poorly investigated.
Consequently, the aim of the study was to generate a comprehensive overview of mRNA de novo synthesis and degradation and its contribution to total mRNA changes in monocytic cells in the course of hypoxia.
To this end, I used thiol-linked alkylation for the metabolic sequencing of RNA (SLAM-Seq) to characterize RNA dynamics under hypoxia. Specifically, I labeled monocytic THP-1 cells under normoxia (N), acute hypoxia (AH; 8 h 1% O2), or chronic hypoxia (CH; 72 h 1% O2) with 4-thiouridine (4sU), which allows for transcriptome-wide identification of de novo synthesized mRNAs and estimation of their half-lives. Total mRNA expression analyses revealed that most changes occurred under CH. Considering that HIF accumulation and resulting transcriptional regulation was shown to decline again under CH, I further analyzed the impact of RNA stability on gene expression. I observed a global reduction in RNA half-lives under hypoxia, indicative for the attenuation of energy-consuming protein synthesis upon oxygen deprivation. Moreover, I observed a subgroup of hypoxic destabilized transcripts with resulting decreased mRNA expression under CH, which consisted of 59 nuclear-encoded mitochondrial mRNAs. This might prevent futile production of new mitochondria under conditions, where mitochondria are even actively degraded to prevent production of detrimental reactive oxygen species.
While stability-regulated transcripts were mainly destabilized under hypoxia, the vast majority of differentially de novo synthesized transcripts were upregulated.
Functional analyses revealed not only hypoxia, but also cholesterol homeostasis and inflammatory response as top enriched terms, corroborating findings on total mRNA level. Focusing on hypoxia-altered cholesterol metabolism, I observed an 9 accumulation of early and a decrease in late cholesterol precursors, which are separated by several oxygen-dependent enzymatic steps. Although total cholesterol levels were only slightly reduced, my data indicate locally lowered endoplasmic reticulum (ER) cholesterol levels under hypoxia, which cause feedback activation of the ER cholesterol-sensing transcription factor sterol regulatory element-binding protein 2 (SREBP2) and induction of cholesterol biosynthesis enzymes. Interestingly, a broad range of interferon-stimulated genes (ISGs), mainly known for their antiviral function, was also induced under hypoxia with similar kinetics as SREBP2 targets, suggesting an immunometabolic crosstalk. While the availability of certain cholesterol biosynthesis intermediates as well as a direct involvement of SREBP2 seemed rather unlikely to cause hypoxic ISG induction, changes in intracellular cholesterol distribution appeared crucial for the hypoxic induction of chemokine-ISGs. Mechanistically, I found that MyD88-dependent toll-like receptor 4 (TLR4) signaling contributes to enhanced hypoxic ISG induction, likely sensitized by changes in cholesterol dynamics. Importantly, hypoxia amplified induction of chemokine-ISGs in monocytes upon treatment with severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2) spike protein via TLR4 similarly as after addition of infectious virus, which might contribute to systemic inflammation in hypoxemic patients with severe coronavirus disease-2019 (COVID-19).
Taken together, I comprehensively analyzed RNA dynamics in hypoxic monocytes. Specifically, I identified RNA stability as a modulating mechanism to limit production of mitochondria under oxygen-restricted conditions. Moreover, I characterized the immunometabolic crosstalk between disturbed cholesterol homeostasis and spontaneous induction of interferon (IFN)-signaling in hypoxic monocytes, which might contribute to systemic inflammation in severe cases of COVID-19.
Aim: The cytochrome P450 reductase (POR) along with the cytochrome P450 enzymes (CYP) are responsible for the metabolism of a multitude of metabolites important for the maintenance of tissue function. Defects in this system have been associated with cardiovascular diseases. These enzymes are known to produce vasoactive lipids that modulate vascular tone. The aim of this study was to identify the consequence of a loss in endothelial POR for vascular function.
Methods and Results: To identify the endothelial contribution of the POR/CYP450 system to vascular function, we generated an endothelial-specific, tamoxifen-inducible POR knockout mouse (ecPOR-/-). Under basal condition ecPOR-/- already exhibited endothelial dysfunction in aorta and mesenteric vessels (acetylcholine-dependent relaxation, LogEC50 -7.6M for CTR vs. -7.2M for ecPOR-/- in aorta) and lower nitric oxide levels in the plasma (CTR: 236.8 ±77.4; ecPOR-/- 182.8 ±34.1 nmol/L). This dysfunction was coupled to attenuated eNOS function detected by the heavy arginine assay and decreased eNOS phosphorylation on S1177. Furthermore, insulin-induced phosphorylation of the eNOS activator, AKT, was also attenuated in the aorta from ecPOR-/- mice as compared to control mice. CYP450-dependent EET production was lower in plasma, lung and aorta of ecPOR-/- mice and this was accompanied with increased levels of vasoconstriction prostanoids (lipidomics of aorta, plasma and lung freshly isolated from CTR and ecPOR-/- mice). MACE-RNAseq from these aortas also showed a significant increase in genes annotated to eicosanoid production. In an in vivo angiotensin II model, acute deletion of POR increased the blood pressure as measured by telemetry and tail cuff (137.4 ± 15.9 mmHg in WT; 152.1 ± 7.154 mmHg in ecPOR-/-). In a rescue experiment using the NSAID naproxen, the increase in blood pressure induced by deletion of endothelial POR was abolished.
Conclusion: Collectively, in endothelial cells POR regulates eNOS activity and orchestrates the metabolic fate of arachidonic acid towards the vessel dilating EETs and away from deleterious prostanoids. In the absence of POR this endothelial regulation is compromised leading to vascular dysfunction.
Spontaneous brain activity builds the foundation for human cognitive processing during external demands. Neuroimaging studies based on functional magnetic resonance imaging (fMRI) identified specific characteristics of spontaneous (intrinsic) brain dynamics to be associated with individual differences in general cognitive ability, i.e., intelligence. However, fMRI research is inherently limited by low temporal resolution, thus, preventing conclusions about neural fluctuations within the range of milliseconds. Here, we used resting-state electroencephalographical (EEG) recordings from 144 healthy adults to test whether individual differences in intelligence (Raven’s Advanced Progressive Matrices scores) can be predicted from the complexity of temporally highly resolved intrinsic brain signals. We compared different operationalizations of brain signal complexity (multiscale entropy, Shannon entropy, Fuzzy entropy, and specific characteristics of microstates) regarding their relation to intelligence. The results indicate that associations between brain signal complexity measures and intelligence are of small effect sizes (r ∼ 0.20) and vary across different spatial and temporal scales. Specifically, higher intelligence scores were associated with lower complexity in local aspects of neural processing, and less activity in task-negative brain regions belonging to the default-mode network. Finally, we combined multiple measures of brain signal complexity to show that individual intelligence scores can be significantly predicted with a multimodal model within the sample (10-fold cross-validation) as well as in an independent sample (external replication, N = 57). In sum, our results highlight the temporal and spatial dependency of associations between intelligence and intrinsic brain dynamics, proposing multimodal approaches as promising means for future neuroscientific research on complex human traits.
Behavioural inflexibility is a symptom of neuropsychiatric and neurodegenerative disorders such as Obsessive-Compulsive Disorder, Autism Spectrum Disorder and Alzheimer’s Disease, encompassing the maintenance of a behaviour even when no longer appropriate. Recent evidence suggests that insulin signalling has roles apart from its regulation of peripheral metabolism and mediates behaviourally-relevant central nervous system (CNS) functions including behavioural flexibility. Indeed, insulin resistance is reported to generate anxious, perseverative phenotypes in animal models, with the Type 2 diabetes medication metformin proving to be beneficial for disorders including Alzheimer’s Disease. Structural and functional neuroimaging studies of Type 2 diabetes patients have highlighted aberrant connectivity in regions governing salience detection, attention, inhibition and memory. As currently available therapeutic strategies feature high rates of resistance, there is an urgent need to better understand the complex aetiology of behaviour and develop improved therapeutics. In this review, we explore the circuitry underlying behavioural flexibility, changes in Type 2 diabetes, the role of insulin in CNS outcomes and mechanisms of insulin involvement across disorders of behavioural inflexibility.
The ancestral SARS-CoV-2 strain that initiated the Covid-19 pandemic at the end of 2019 has rapidly mutated into multiple variants of concern with variable pathogenicity and increasing immune escape strategies. However, differences in host cellular antiviral responses upon infection with SARS-CoV-2 variants remain elusive. Leveraging whole-cell proteomics, we determined host signaling pathways that are differentially modulated upon infection with the clinical isolates of the ancestral SARS-CoV-2 B.1 and the variants of concern Delta and Omicron BA.1. Our findings illustrate alterations in the global host proteome landscape upon infection with SARS-CoV-2 variants and the resulting host immune responses. Additionally, viral proteome kinetics reveal declining levels of viral protein expression during Omicron BA.1 infection when compared to ancestral B.1 and Delta variants, consistent with its reduced replication rates. Moreover, molecular assays reveal deferral activation of specific host antiviral signaling upon Omicron BA.1 and BA.2 infections. Our study provides an overview of host proteome profile of multiple SARS-CoV-2 variants and brings forth a better understanding of the instigation of key immune signaling pathways causative for the differential pathogenicity of SARS-CoV-2 variants.
Standard values of the upper body posture in healthy adults with special regard to age, sex and BMI
(2023)
In order to classify and analyze the parameters of upper body posture in clinical or physiotherapeutic settings, a baseline in the form of standard values with special regard to age, sex and BMI is required. Thus, subjectively healthy men and women aged 21–60 years were measured in this project. The postural parameters of 800 symptom-free male (n = 397) and female (n = 407) volunteers aged 21–60 years (Ø♀: 39.7 ± 11.6, Ø ♂: 40.7 ± 11.5 y) were studied. The mean height of the men was 1.8 ± 0.07 m, with a mean body weight of 84.8 ± 13.1 kg and an average BMI of 26.0 ± 3.534 kg/m2. In contrast, the mean height of the women was 1.67 ± 0.06 m, with a mean body weight of 66.5 ± 12.7 kg and an average BMI of 23.9 ± 4.6 kg/m2. By means of video rasterstereography, a 3-dimensional scan of the upper back surface was measured when in a habitual standing position. The means or medians, confidence intervals, tolerance ranges, the minimum, 2.5, 25, 50, 75, 97.5 percentiles and the maximum, plus the kurtosis and skewness of the distribution, were calculated for all parameters. Additionally, ANOVA and a factor analyses (sex, BMI, age) were conducted. In both sexes across all age groups, balanced, symmetrical upper body statics were evident. Most strikingly, the females showed greater thoracic kyphosis and lumbar lordosis angles (kyphosis: Ø ♀ 56°, Ø♂ 51°; lordosis: Ø ♀ 49°, Ø♂ 32°) and lumbar bending angles (Ø ♀ 14°, Ø♂ 11°) than the males. The distance between the scapulae was more pronounced in men. These parameters also show an increase with age and BMI, respectively. Pelvic parameters were independent of age and sex. The upper body postures of women and men between the ages of 21 and 60 years were found to be almost symmetrical and axis-conforming with a positive correlation for BMI or age. Consequently, the present body posture parameters allow for comparisons with other studies, as well as for the evaluation of clinical (interim) diagnostics and applications.
Essentials
• The role of platelet IL-1β release in chronic inflammation is currently unclear.
• Platelets from 65 patients with varying degrees of chronic inflammation were studied.
• Chronic inflammation linked to reduced levels of intracellular IL-1β and IL-1β release.
• Chronic inflammation induces a phenotype that indicates chronic IL-1β release from platelets.
Abstract
Background: Chronic inflammation is a cardiovascular risk factor, and interleukin-1β (IL-1β) is central to the inflammatory host response. Platelets contain the NLRP3 inflammasome and are able to translate IL-1β messenger RNA (mRNA) and secrete mature IL-1β upon activation. However, the role of a chronic inflammatory environment in platelet IL-1β mRNA and protein content remains unclear.
Objectives: The aim of the current study was to investigate intracellular platelet IL-1β and IL-1β mRNA in a chronic inflammatory state.
Methods: Sixty-five patients with stable inflammation (ie, high-sensitivity C-reactive protein within predefined margins in 2 separate measurements) were stratified according to high-sensitivity C-reactive protein levels in low (0.0-0.9 mg/L), medium (1.0-2.9 mg/L), and high (3.0-9.9 mg/L) risk groups. Platelet reactivity as well as platelet IL-1β protein synthesis were studied.
Results: The highest risk group was characterized by a distinct cardiovascular risk profile and approximately 20% higher platelet counts. While platelet reactivity was not different, a reduction in intracellular platelet IL-1β mRNA and IL-1β protein levels was observed in the highest risk group and was linked to decreased platelet size and granularity. This signature suggests a phenotype of chronic IL-1β secretion and could be experimentally phenocopied by stimulation of platelets from healthy volunteers with either TRAP-6 or collagen related peptide (CRP-XL).
Conclusion: Our data suggest a phenotype of chronic IL-1β secretion by platelets in patients with chronic sterile inflammation.
Background The COVID-19 pandemic has spurred large-scale, inter-institutional research efforts. To enable these efforts, researchers must agree on dataset definitions that not only cover all elements relevant to the respective medical specialty but that are also syntactically and semantically interoperable. Following such an effort, the German Corona Consensus (GECCO) dataset has been developed previously as a harmonized, interoperable collection of the most relevant data elements for COVID-19-related patient research. As GECCO has been developed as a compact core dataset across all medical fields, the focused research within particular medical domains demands the definition of extension modules that include those data elements that are most relevant to the research performed in these individual medical specialties.
Objective To (i) specify a workflow for the development of interoperable dataset definitions that involves a close collaboration between medical experts and information scientists and to (ii) apply the workflow to develop dataset definitions that include data elements most relevant to COVID-19-related patient research in immunization, pediatrics, and cardiology.
Methods We developed a workflow to create dataset definitions that are (i) content-wise as relevant as possible to a specific field of study and (ii) universally usable across computer systems, institutions, and countries, i.e., interoperable. We then gathered medical experts from three specialties (immunization, pediatrics, and cardiology) to the select data elements most relevant to COVID-19-related patient research in the respective specialty. We mapped the data elements to international standardized vocabularies and created data exchange specifications using HL7 FHIR. All steps were performed in close interdisciplinary collaboration between medical domain experts and medical information scientists. The profiles and vocabulary mappings were syntactically and semantically validated in a two-stage process.
Results We created GECCO extension modules for the immunization, pediatrics, and cardiology domains with respect to the pandemic requests. The data elements included in each of these modules were selected according to the here developed consensus-based workflow by medical experts from the respective specialty to ensure that the contents are aligned with the respective research needs. We defined dataset specifications for a total number of 48 (immunization), 150 (pediatrics), and 52 (cardiology) data elements that complement the GECCO core dataset. We created and published implementation guides and example implementations as well as dataset annotations for each extension module.
Conclusions These here presented GECCO extension modules, which contain data elements most relevant to COVID-19-related patient research in immunization, pediatrics and cardiology, were defined in an interdisciplinary, iterative, consensus-based workflow that may serve as a blueprint for the development of further dataset definitions. The GECCO extension modules provide a standardized and harmonized definition of specialty-related datasets that can help to enable inter-institutional and cross-country COVID-19 research in these specialties.