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Institute
- Medizin (5139)
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- Frankfurt Institute for Advanced Studies (FIAS) (48)
- Exzellenzcluster Makromolekulare Komplexe (45)
Dendritic spines are small membranous protrusions covering the dendritic tree of principal telencephalic neurons, such as the GC or CA2-pc. The CA2-subregion is crucial for social memory. Dendritic spines are a main site of synaptic plasticity, which is a key element of learning and memory. The plasticity-related protein Synaptopodin (SP) is essential to form the spine apparatus (SA), a spine-specific organelle involved in synaptic plasticity. SP stabilizes dendritic spines. This thesis investigated, for the first time, the dendritic SP-distribution and its influence on spine density and spine head size under different conditions in adult mice ex vivo: 1) SP-overexpression (gain-of-function), 2) SP-deficiency (loss-of-function), and 3) wild type-level of SP-expression in male and female mice (sex-differences in dCA2). SP-overexpression in adult male CSPtg-mice led to a ~doubled ratio of SP+ spines in the OML of the DG, while the spine density, the average spine head size and the average SP-puncta size were not affected. Consistently, SP-deficiency in adult male SP-KO animals had no significant effect on average spine head size. Of importance, under SP-overexpression, many small spines and a few large spines become SP+, assumingly assembling a SA. On a functional level, this may indicate an activation of silent synapses. dCA2 showed sex specific differences in spine density and spine morphology in a layer-specific manner: In males, pc-spines of the basal dCA2-compartment showed larger spine heads than females in the diestrus stage of their cycle (females (diestrus), while spine density was not significantly different. In the apical dCA2-compartment (sr), females (diestrus) showed an increased spine density, while spine head size was still shifted towards larger head sizes in males. In addition, dCA2 showed significant layer-specific differences in spine head size, but in a sex-independent manner: In both sexes, average spine head size in the apical sr was significantly smaller than in the basal so. This findings could reflect a yet unknown compartment-specific difference in synaptic plasticity in the basal compartment, which is preferentially targeted by neuromodulatory input from extrahippocampal sources such as the PVN or SUM99,101,170,189-195. In so of dCA2, there was no sex-specific difference in SP-puncta size or in the ratio of SP+ spines, indicating that SP is distributed in a sex-independent manner in dCA2 in adult mice.
Untersuchung von Arachidonsäuremetaboliten im Zusammenhang mit "Post exercixe hypotonia" (PEH)
(2023)
Post exercise hypotonia (PEH) ist das Phänomen kurzfristiger Blutdrucksenkung in der Erholungsphase nach einer Sporteinheit. Bei der Ausprägung von PEH besteht eine hohe interindividuelle Variabilität, allerdings gibt es eine Korrelation zwischen PEH und langfristigen Erfolgen von Sporttherapie bei Hypertonikern.
Die Mechanismen sind unklar und man geht davon aus, dass lokale, vasoaktive Substanzen – und unter diesen möglicherweise sogenannte bioaktive Lipide – eine Rolle spielen. Ziel dieser Arbeit war, in einer Pilot-Studie Arachidonsäure-Metabolite im Zusammenhang mit PEH zu untersuchen. Es konnte gezeigt werden, dass die untersuchten AA-Metabolite (Hydroxyeicosatetraensäuren (HE-TEs), Dihydroxyeicosatriensäuren (DHETs), Prostaglandin E2 (PGE2) und Thromboxan (TXA)) mit einer schnellen Kinetik in der frühen Erholungsphase im Plasma anfluten. Konzentrationsveränderungen von 15-HETE korrelierten mit der Ausprägung von PEH, allerdings unabhängig von AA-Spiegeln. Eine direkte vasoaktive Funktion von 15-HETE wird in der Literatur kontrovers diskutiert. Das 15-HETE-produzierende Enzym 15-LOX aber wird als induzierbarer Endothelium-Derived Hyperpolarizing Factor (EDHF) diskutiert. Möglicherweise könnte 15-HETE somit eine Indikatorsubstanz für die Induktion von 15-Lipoxygenase (LOX) und somit weiteren, direkt vasoaktiven 15-LOX Produkten sein.
Ein weiteres Ziel der Arbeit war die Untersuchung eines möglichen Zusammenhangs zwischen Immunzellregulation und PEH nach Sport. Starke körperliche Aktivität führt zu komplexen immunologischen, inflammatorischen und metabolischen Prozessen. Ein Anstieg von Leukozyten im peripheren Blut nach Sport ist seit Langem bekannt. Der Neutrophilen/Lymphozyten (N/L)-Index hat in den vergangenen Jahren im Rahmen der Risikoeinschätzung kardiovaskulärer Erkrankungen zunehmend an Bedeutung gewonnen. Im Rahmen dieser Studie konnten wir zeigen, dass unter den gegebenen Bedingungen nicht der N/L-Index, sondern viel mehr der verzögerte Lymphozytenanstieg in der Erholungsphase mit der
Ausprägung von PEH korreliert. Fettsäure-metabolisierende Enzyme in Neutrophilen stiegen im Rahmen der Sportintervention signifikant. Die Expressionsanalyse verschiedener inflammatorischer Enzyme ergab eine negative Korrelation von Cyclooxygenase (COX)-2 Expression mit der Ausprägung von PEH. Somit lässt sich die Hypothese aufstellen, dass eine stärkere Ausprägung inflammatorischer Signalwege mit COX-2 Expressionssteigerung eine PEH reduzieren könnte. Peroxisom-Proliferator-aktivierte Rezeptoren (PPAR) als nukleäre Rezeptoren für bioaktive Lipide stellen ein Bindeglied für metabolische und entzündliche epigenetische Effekte im Rahmen von Sport dar. Im Rahmen der Studie konnten wir eine starke Korrelation zwischen der Induktion von PPAR-delta und der COX-2 Expressionssteigerung in Neutrophilen feststellen. Im Rahmen dieser explorativen Pilotstudie konnte gezeigt werden, dass AA und ihre Metabolie einer schnellen Kinetik nach Sport unterliegen und 15-HETE sowie im Blut zirkulierende Immunzellen möglicherweise bei der Ausprägung von PEH eine Rolle spielen und als Prädiktoren des Therapieerfolgs oder als Parameter zur Therapieindividualisierung für Sportprogramme bei Hypertonikern genutzt werden könnten.
Zehn Jahre Mitmenschlichkeit
(2024)
Bei THS handelt sich um einen operativen Eingriff der Neurochirurgie, bei dem Impulse in tiefere Hirnstrukturen appliziert werden, ohne diese zu beschädigen. Die THS stellt eine etablierte Behandlungsoption bei Bewegungsstörungen von Morbus Parkinson, essentiellem Tremor und Dystonie dar. Zugleich besteht ein zunehmendes Interesse an weiteren Anwendungsmöglichkeiten für neurologische und psychiatrische Erkrankungen. Insoweit wird von einem weiterwachsenden Therapieverfahren in der Neurochirurgie auszugehen sein.
Die bislang implantierten THS-Systeme sind nicht bzw. nur eingeschränkt MRT-fähig.
Aufgrund der in den letzten Jahren zu beobachtenden steigenden Anzahl an Bildgebungen, insbesondere bei MRT-Untersuchungen, stellt sich hier die Frage nach dem Umgang mit einem bildgebenden Verfahren und der Notwendigkeit MRT-fähiger THS-Systeme für das Patientenkollektiv.
Hierzu wurde in der vorliegenden Dissertation analysiert, wie viele der mit THS versorgten Patienten überhaupt ein MRT - nach erfolgreicher Implantation - benötigt haben und zu welchen Konsequenzen dies gegebenenfalls geführt hat.
Die in diesem Zusammenhang retrospektiv gesammelten Patientendaten stammen sowohl aus dem digitalen Patientensystem als auch aus telefonischen Interviews mit Patienten, die seit mindestens 12 Monaten ein THS-System implantiert bekommen haben. Es wurde erfasst, bei wem und aus welchem Grund eine CT- oder MRT-Untersuchung stattgefunden hat. Zusätzlich sind diese Daten von einem unabhängigen Neurologen dahingehend beurteilt worden, ob ein MRT anstatt eines CTs sinnvoller gewesen wäre.
Bei 28 der 54 hier teilnehmenden Patienten ist mindestens eine Bildgebung im Rahmen einer CT- oder MRT-Untersuchung erfolgt. In 16 Fällen ist dabei bei 14 dieser Patienten die Frage aufgekommen, ob ein MRT durchgeführt werden solle. In diesem Zusammenhang sind letztlich sieben MRT-Untersuchungen an sieben Patienten durchgeführt worden, drei kraniale MRT-Untersuchungen und vier Wirbelsäulen MRT-Untersuchungen.
In sieben Fällen bei sechs Patienten hätte der unabhängige Neurologe zu einer MRT-Untersuchung anstatt der durchgeführten CT-Untersuchung geraten.
Von den durchgeführten MRT-Untersuchungen haben alle kranialen sowie zwei Wirbelsäulen MRT-Untersuchungen zu einer konservativen Therapie geführt. Zu einer operativen Therapie haben zwei der durchgeführten Wirbelsäulen MRT-Untersuchungen geführt. Während der in diesem Patientenkollektiv durchgeführten MRT-Untersuchungen ist es zu keiner kritischen Situationen oder Folgeschäden gekommen. Aus Gründen der Patientensicherheit wird trotzdem empfohlen, soweit möglich, bei Patienten mit einem THS-Implantat eine CT-Untersuchung durchzuführen.
Aus den dieser Arbeit zu Grunde liegenden Daten lässt sich konstatieren, dass der Einsatz MRT-fähiger THS-Geräte nicht zwingend geboten ist, dies insbesondere bei jüngeren Patienten jedoch durchaus in Betracht gezogen werden sollte.
Das Harnblasenkarzinom ist einer der häufigsten Tumoren weltweit. Insbesondere die muskelinvasiven Tumoren haben eine schlechte Prognose und stellen sich morphologisch sehr unterschiedlich dar. Diese Heterogenität wird bislang bei Therapieentscheidungen nicht beachtet. Um Patienten zukünftig individuell auf den vorliegenden Subtyp des muskelinvasiven Harnblasenkarzinoms (MIBC, muscle invasive bladder cancer) behandeln zu können und dadurch unnötige Belastungen durch Chemotherapien vermeiden zu können, ist eine einfache und kostengünstige Diagnostik erforderlich. Das Ziel der vorliegenden Arbeit war es, den Einsatz bestimmter immunhistochemischer Färbungen als ein mögliches diagnostisches Routineverfahren zur Bestimmung der vorliegenden Subtypen auszutesten. Hierzu wurde die Expression von „luminalen“ und „basalen“ Proteinen mit histologischen Subtypen des MIBCs korreliert. In einem zweiten Schritt wurde der Einfluss auf das Überleben mit und ohne adjuvante Chemotherapie untersucht.
Es wurden insgesamt 181 Tissue-Microarray-Spots analysiert. Alle histologischen Patientenproben sowie klinischen Daten stammten aus dem Universitätsklinikum Frankfurt am Main. Aus den entsprechenden Gewebeblöcken wurden Stanzen zur Erstellung eines Tissue-Microarrays (TMAs) entnommen. Diese wurden konventionell angeschnitten und histologisch mit Hämatoxylin-Eosin (H/E) sowie immunhistochemisch mit Cytokeratin 5/6 (CK5/6), Cytokeratin 20 (CK20), Glutamyl Aminotransferase-Untereinheit A bindendem Protein 3 (GATA3), Tumorsuppressor- protein p53 und Synaptophysin (SYNAPT) gefärbt.
Anhand der H/E-Schnitte wurden die vorliegenden histologischen Subtypen lichtmikroskopisch bestimmt und es folgte eine statistische Auswertung der Färbeergebnisse. Die deskriptive statistische Analyse zeigte insbesondere für die beiden Färbungen CK5/6 und GATA3 signifikante Ergebnisse. Deshalb wurden in einem zweiten Schritt alle Fälle der Studienkohorte den bekannten vier Gruppen: CK5/6 positiv, GATA3 positiv, doppelt positiv und doppelt negativ zugeordnet und näher untersucht. Es folgte eine Überlebensanalyse nach Kaplan Meier Schätzer sowie uni- und multivariate Analysen.
Die Ergebnisse zeigten eine Assoziation der Expression von CK5/6 mit einer squamösen Differenzierung (96%) und eine Assoziation der Expression von GATA3 mit einer mikropapillären Differenzierung (100%). Die adjuvante Chemotherapie ging mit einem Überlebensvorteil (HR 0,15 95%KI 0,1-0,3; p<0,001) der Patienten mit MIBC einher. Immunhistochemisch doppelt negative Patienten mit MIBC wiesen ein verringertes Gesamtüberleben auf (HR 4,96; 95%KI 1,6-15,6; p=0,006); in der Gruppe der doppelt negativen MIBCs fanden sich fünf verschiedene histologische Subtypen. Zusammenfassend lässt sich sagen, dass die immunhistochemische Klassifizierung des MIBCs mit histologischen Subtypen assoziiert ist und dabei helfen kann, Fälle in der pathologischen Routine in „luminal“ und „basal“ zu unterteilen. Jedoch ist ein auf zwei Markern basierendes Klassifizierungssystem nicht ausreichend, um die Heterogenität des MIBCs abzubilden und die Basis für Therapieentscheidungen zu bilden.
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.
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.
Pericytes are capillary-associated mural cells involved in the maintenance and the stability of the vascular network. This thesis aims to investigate the role of pericytes in the heart in the context of ageing and disease. We highlight the malignant effects of the remodelling in the heart and stress the focus on the role of cardiac pericytes in this context. We show that ageing reduces pericyte coverage and that myocardial infarction (MI) causes an activation of these cells. Single-nuclei and single-cell RNA sequencing analysis of murine hearts further revealed that the expression of the Regulator of G-protein signalling 5 (Rgs5) is reduced in cardiac pericytes both in ageing and transiently at day 1 and day 3 after MI. The loss of RGS5 in pericytes drives an entropic state of these mural cells characterized by morphological changes, excessive extracellular deposition and enhanced Gaq mediated GPCR signalling. The deletion of RGS5 in pericytes causes cardiac systolic dysfunction, induces myocardial fibrosis, and drives the activation of cardiac fibroblasts in a TGFb-dependent manner. In conclusion, our results describe the importance of pericytes maintaining cardiac homeostasis, identify RGS5 as a key regulator of this process and propose pericytes as crucial mediators of cardiac fibrosis and possible therapeutic targets to prevent cardiovascular disease.
Patients with coronavirus disease 19 (COVID-19) commonly show abnormalities of liver tests (LTs) of undetermined cause. Considering drugs as tentative culprits, the current systematic review searched for published COVID-19 cases with suspected drug-induced liver injury (DILI) and established diagnosis using the diagnostic algorithm of RUCAM (Roussel Uclaf Causality Assessment Method). Data worldwide on DILI cases assessed by RUCAM in COVID-19 patients were sparse. A total of 6/200 reports with initially suspected 996 DILI cases in COVID-19 patients and using all RUCAM-based DILI cases allowed for a clear description of clinical features of RUCAM-based DILI cases among COVID-19 patients: (1) The updated RUCAM published in 2016 was equally often used as the original RUCAM of 1993, with both identifying DILI and other liver diseases as confounders; (2) RUCAM also worked well in patients treated with up to 18 drugs and provided for most DILI cases a probable or highly probable causality level for drugs; (3) DILI was preferentially caused by antiviral drugs given empirically due to their known therapeutic efficacy in other virus infections; (4) hepatocellular injury was more often reported than cholestatic or mixed injury; (5) maximum LT values were found for alanine aminotransferase (ALT) 1.541 U/L and aspartate aminotransferase (AST) 1.076 U/L; (6) the ALT/AST ratio was variable and ranged from 0.4 to 1.4; (7) the mean or median age of the COVID-19 patients with DILI ranged from 54.3 to 56 years; (8) the ratio of males to females was 1.8–3.4:1; (9) outcome was favorable for most patients, likely due to careful selection of the drugs and quick cessation of drug treatment with emerging DILI, but it was fatal in 19 patients; (10) countries reporting RUCAM-based DILI cases in COVID-19 patients included China, India, Japan, Montenegro, and Spain; (11) robust estimation of the percentage contribution of RUCAM-based DILI for the increased LTs in COVID-19 patients is outside of the current scope. In conclusion, RUCAM-based DILI with its clinical characteristics in COVID-19 patients and its classification as a confounding variable is now well defined, requiring a new correct description of COVID-19 features by removing DILI characteristics as confounders.
In recent decades, mass spectrometry has moved more than ever before into the front line of protein-centered research. After being established at the qualitative level, the more challenging question of quantification of proteins and peptides using mass spectrometry has become a focus for further development. In this chapter, we discuss and review actual strategies and problems of the methods for the quantitative analysis of peptides, proteins, and finally proteomes by mass spectrometry. The common themes, the differences, and the potential pitfalls of the main approaches are presented in order to provide a survey of the emerging field of quantitative, mass spectrometry-based proteomics.
Evaluation of 2‑methoxyestradiol serum levels as a potential prognostic marker in malignant melanoma
(2021)
Experimental findings indicated that 2‑methoxyestradiol (2‑ME), an endogenous metabolite of 17β‑estradiol, may exhibit anti‑tumorigenic properties in various types of tumour, such as melanoma and endometrial carcinoma. In patients with endometrial cancer, the serum levels of 2‑ME are decreased compared with those in healthy controls, and this finding has been associated with a poor outcome. The aim of the present study was to examine whether the serum levels of 2‑ME are decreased in patients with melanoma, and whether this decrease may be correlated with disease stage and, therefore, serve as a prognostic indicator. ELISA was used to detect serum levels of 2‑ME in patients with stage I‑IV malignant melanoma (MM). A cohort of 78 patients with MM was analysed, along with 25 healthy controls, among whom 15 were women in the second trimester of pregnancy (positive control). As expected, significantly elevated levels of serum 2‑ME were observed in pregnant control patients compared with those in patients with MM and healthy controls. There was no observed correlation between 2‑ME serum levels in patients with MM and disease stage, tumour thickness, lactate dehydrogenase or S100 calcium‑binding protein B levels. In addition, the 2‑ME levels of patients with MM did not differ significantly from those of normal healthy controls. Overall, the findings of the present study indicated that the 2‑ME serum levels in patients with MM were not decreased, and there was no correlation with early‑ or advanced‑stage disease. Therefore, in contrast to published results on endometrial cancer, endogenous serum 2‑ME levels in MM were not found to be correlated with tumour stage and did not appear to be a suitable prognostic factor in MM.
Resting state fMRI has been employed to identify alterations in functional connectivity within or between brain regions following acute and chronic exposure to Δ9-tetrahydrocannabinol (THC), the psychoactive component in cannabis. Most studies focused a priori on a limited number of local brain areas or circuits, without considering the impact of cannabis on whole-brain network organization. The present study attempted to identify changes in the whole-brain human functional connectome as assessed with ultra-high field (7T) resting state scans of cannabis users (N = 26) during placebo and following vaporization of cannabis. Two distinct data-driven methodologies, i.e. network-based statistics (NBS) and connICA, were used to identify changes in functional connectomes associated with acute cannabis intoxication and history of cannabis use. Both methodologies revealed a broad state of hyperconnectivity within the entire range of major brain networks in chronic cannabis users compared to occasional cannabis users, which might be reflective of an adaptive network reorganization following prolonged cannabis exposure. The connICA methodology also extracted a distinct spatial connectivity pattern of hypoconnectivity involving the dorsal attention, limbic, subcortical and cerebellum networks and of hyperconnectivity between the default mode and ventral attention network, that was associated with the feeling of subjective high during THC intoxication. Whole-brain network approaches identified spatial patterns in functional brain connectomes that distinguished acute from chronic cannabis use, and offer an important utility for probing the interplay between short and long-term alterations in functional brain dynamics when progressing from occasional to chronic use of cannabis.
The microtubule (MT) cytoskeleton is crucial for cell motility and migration by regulating multiple cellular activities such as transport and endocytosis of key components of focal adhesions (FA). The kinesin-13 family is important in the regulation of MT dynamics and the best characterized member of this family is the mitotic centromere-associated kinesin (MCAK/KIF2C). Interestingly, its overexpression has been reported to be related to increased metastasis in various tumor entities. Moreover, MCAK is involved in the migration and invasion behavior of various cell types. However, the precise molecular mechanisms were not completely clarified. To address these issues, we generated CRISPR/dCas9 HeLa and retinal pigment epithelium (RPE) cell lines overexpressing or downregulating MCAK. Both up- or downregulation of MCAK led to reduced cell motility and poor migration in malignant as well as benign cells. Specifically, it’s up- or downregulation impaired FA protein composition and phosphorylation status, interfered with a proper spindle and chromosome segregation, disturbed the assembly and disassembly rate of FA, delayed cell adhesion, and compromised the plus-tip dynamics of MTs. In conclusion, our data suggest MCAK act as an important regulator for cell motility and migration by affecting the actin-MT cytoskeleton dynamics and the FA turnover, providing molecular mechanisms by which deregulated MCAK could promote malignant progression and metastasis of tumor cells.
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.
Bilateral simultaneous cochlear implantation is a safe method of hearing rehabilitation in adults
(2023)
Purpose: Bilateral cochlear implantation is an effective treatment for patients with bilateral profound hearing loss. In contrast to children, adults mostly choose a sequential surgery. This study addresses whether simultaneous bilateral CI is associated with higher rates of complications compared to sequential implantation.
Methods: 169 bilateral CI surgeries were analyzed retrospectively. 34 of the patients were implanted simultaneously (group 1), whereas 135 patients were implanted sequentially (group 2). The duration of surgery, the incidence of minor and major complications and the duration of hospitalization of both groups were compared.
Results: In group 1, the total operating room time was significantly shorter. The incidences of minor and major surgical complications showed no statistically significant differences. A fatal non-surgical complication in group 1 was particularly extensively reappraised without evidence of a causal relationship to the chosen mode of care. The duration of hospitalization was 0.7 days longer than in unilateral implantation but 2.8 days shorter than the combined two hospital stays in group 2.
Conclusion: In the synopsis of all considered complications and complication-relevant factors, equivalence of simultaneous and sequential cochlear implantation in adults in terms of safety was found. However, potential side effects related to longer surgical time in simultaneous surgery must be considered individually. Careful patient selection with special consideration to existing comorbidities and preoperative anesthesiologic evaluation is essential.
Untreated periodontal disease may influence general health. However, how may a physician, who is not trained in periodontal probing, detect untreated periodontitis?
Activated matrix metalloproteinase-8 (aMMP-
8) in saliva correlates with periodontal probing parameters. Thus, sensitivity and specificity of a chair-side test for aMMP-8 to detect periodontitis were evaluated. Thirty cases [untreated chronic periodontitis (ChP); 15 generalized moderate and 15 generalized severe] and 30 controls [probing depths (PD) ≤3 mm, vertical probing attachment level (PAL-V) ≤2 mm at <30 % of sites) were examined periodontally (PD, PAL-V, bleeding on probing). Subsequently, the aMMP-8 test was performed. The test kit
becomes positive with ≥25 ng/ml aMMP-8 in the sample.
The aMMP-8 test was positive in 87 % of ChP and in 40 % of controls. That corresponds to a sensitivity of 87 % and a specificity of 60 %. The sensitivity to detect generalized severe ChP was 93 % (60 % specificity). Backward
stepwise logistic regression analysis to explain positive
aMMP-8 tests identified exclusively ChP with an odds of 9.8 (p < 0.001). Positive results of the aMMP-8 test significantly correlate with generalized ChP. The aMMP-8 test may be used by physicians to detect periodontitis in their patients.
Colorectal cancer (CRC) is one of the most common tumor entities worldwide and a common cause of cancer-associated death. Colorectal cancer liver metastases (CRLM) thereby constitute a severe life-limiting factor. The therapy of CRLM presents a major challenge and surgical resection as well as systemic chemotherapy remain the first-line treatment options. Over the years several locoregional, vascular- and image-based treatments offered by interventional radiologists have emerged when conventional therapies fail, or metastases recurrence occurs. Among such options is the conventional/traditional transarterial chemoembolization (cTACE) by local injection of a combination of chemotherapeutic- and embolic-agents. A similar treatment is the more recent irinotecan-loaded drug-eluting beads TACE (DEBIRI-TACE), which are administered using the same approach. Numerous studies have shown that these different types of chemoembolization can be applied in different clinical settings safely. Furthermore, such treatments can also be combined with other local or systemic therapies. Unfortunately, due to the incoherent patient populations of studies investigating TACE in CRLM, critics state that the definite evidence supporting positive patient outcomes is still lacking. In the following article we review studies on conventional and DEBIRI-TACE. Although highly dependent on the clinical setting, prior therapies and generally the study population, cTACE and DEBIRI-TACE show comparable results. We present the most representative studies on the different chemoembolization procedures and compare the results. Although there is compelling evidence for both approaches, further studies are necessary to determine which patients profit most from these therapies. In conclusion, we determine TACE to be a viable option in CRLM in different clinical settings. Nevertheless, a multidisciplinary approach is desired to offer patients the best possible care.
In den Bürgerwissenschaften, auch bekannt unter dem englischen Begriff Citizen Science, existiert eine Vielzahl an Forschungsansätzen und Methoden. Während diese in vielen wissenschaftlichen Disziplinen gut etabliert sind, finden sich augenscheinlich relativ wenige davon in der medizinischen und Gesundheitsforschung. Allerdings zeigt ein Blick in die Praxis, dass bürgerwissenschaftliche Ansätze in der Medizin und Gesundheitsforschung durchaus praktiziert werden, jedoch häufig unter anderen Namen. Der Artikel bietet aus interdisziplinärer Perspektive einen (selektiven) Überblick über Begriffe, reflektiert diese und die dahinterstehenden Methoden und diskutiert sie vergleichend. Im Fokus steht dabei der Grad der Beteiligung der Bürger*innen bzw. Patient*innen an wissenschaftlicher Forschung.
Low platelet count predicts reduced survival in potentially resectable hepatocellular carcinoma
(2022)
The prognostic role of platelet count in hepatocellular carcinoma (HCC) remains unclear, and in fact both thrombocytopenia and thrombocytosis are reported as predictors of unfavourable outcomes. This study aimed to clarify the prognostic value of preoperative platelet count in potentially resectable HCC. We retrospectively reviewed 128 patients who underwent hepatic resection for HCC at a tertiary academic centre (2007–2019). Patient data were modelled by regression analysis, and platelet count was treated as a continuous variable. 89 patients had BCLC 0/A tumours and 39 had BCLC B tumours. Platelet count was higher in patients with larger tumours and lower in patients with higher MELD scores, advanced fibrosis, and portal hypertension (p < 0.001 for all listed variables). After adjusting for BCLC stage and tumour diameter, low platelet count associated with reduced overall survival (hazard ratio 1.25 per 50/nL decrease in platelet count, 95% confidence interval (CI) 1.02–1.53, p = 0.034) and increased perioperative mortality (odds ratio 1.96 per 50/nL decrease in platelet count, 95% CI 1.19–3.53, p = 0.014). Overall, low platelet count correlates with increased liver disease severity, inferior survival, and excess perioperative mortality in resectable HCC. These insights might be applied in clinical practice to better select patients for resection.
Hintergrund: Epilepsie bezeichnet eine Erkrankung, welche durch eine anhaltende Prädisposition für Symptome, die im Zusammenhang mit einer ungewöhnlich starken oder synchronisierten elektrischen Aktivität des Gehirns auftreten (=epileptischer Anfall) charakterisiert ist. Mutationen in dem Gen DEPDC5 (Dishevelled, Egl-10 and Pleckstrin (DEP) domain-containing protein 5) sind mit fokalen Epilepsien assoziiert und führen in Tiermodellen und humanen Modellen zu einer Überaktivierung des mTOR-Signalweges. Auf neuromorphologischer Ebene zeigt sich die mTOR-Überaktivierung durch eine Vergrößerung des Zelldurchmessers und einer zunehmenden Verästelung der Neuriten. Ziel dieser Studie war es, die morphologischen Auswirkungen der DEPDC5-assoziierten mTOR-Überaktivierung in der SH-SY5Y-Neuroblastomzelllinie zu untersuchen. Dadurch soll eine Einschätzung getroffen werden, ob das im Zusammenhang mit neurodegenerativen Erkrankungen bereits gut etablierte SH-SY5Y-Zellmodell auch bei der Untersuchung epilepsieassoziierter Pathomechanismen zum Einsatz kommen kann.
Methoden: Unter Einsatz der CRISPR/Cas9-Methode wurden Knockout(KO)-Mutationen in Exon 2 und Exon 3 des DEPDC5-Gens erzeugt und diese mittels Sanger-Sequenzierung bestätigt. Danach wurden die Knockouts auf RNA- und Proteinebene, durch Real-time-RT-PCR und Western Blot validiert. Die bestätigten homozygoten DEPDC5-KO-Zelllinen wurden anschließend mittels Western Blot auf eine mTOR-Überaktivierung untersucht. Zuletzt erfolgte die neuromorphologische Validierung des DEPDC5-KO. Die Zellgröße proliferierender SH-SY5Y wurden mittels Durchflusszytometrie (FACS) untersucht. Zudem bestimmten wir die neuronale Architektur differenzierter SH-SY5Y unter Einsatz der Sholl-Analyse.
Ergebnisse: Es konnten vier unabhängige DEPDC5-KO-SH-SY5Y-Zelllinien mit homozygoten Indel-Mutationen und vorzeitigem Stoppcodon in Exon 3 generiert werden. Die erwartete Reduktion an DEPDC5-mRNA konnte mittels Real-time 10 RT-PCR nicht festgestellt werden. Die Abwesenheit des Proteins konnte durch Western Blot aber gezeigt werden. Funktionell konnte für alle Zelllinien eine mTOR-Überaktivierung mittels Western Blot nachgewiesen werden. Dabei konnte phosphoryliertes AKT (AKT serine/threonine kinase 1) als stabilster Marker etabliert werden. Auf neuromorphologischer Ebene ließ sich ein Trend in Richtung vergrößertem Zelldurchmesser bei verlängertem Auswachsen der Neuriten feststellen, wobei sich für das Modell Unterschiede zwischen den einzelnen Klonen ergaben.
Diskussion: In dieser Studie gelang es erstmals, den Zusammenhang zwischen DEPDC5-KO und einer mTOR-Überaktivierung in der onkogenen SH-SY5Y-Zelllinie zu replizieren. Das verlängerte Auswachsen der Neuriten, bei jedoch gleichbleibender Anzahl peripherer Verästelungen, stellt dabei einen neuen Befund dar und könnte durch die frühe neuronale Entwicklungsstufe des SH-SY5Y-Zellmodells erklärt werden. Auf Grundlage der Ergebnisse dieser Arbeit lässt sich sagen, dass das robuste und kostengünstige SH-SY5Y-Zellmodell insbesondere für high-throughput Methoden und Screeningassays ein geeignetes Modell ist. Durch die Kombination mit reiferen Zellmodellen, wie beispielsweise iPSCs (induced pluripotent stem cells), könnte der Phänotyp eines DEPDC5-KO und anderer mTOR-assoziierter Epilepsien, möglichst umfassend in-vitro dargestellt werden.
Background: The Global Burden of Diseases Study 2017 predicted that chronic obstructive pulmonary disease (COPD) is the second leading cause of death, the fourth leading cause of premature death, and the third cause for DALYs lost in Nepal. However, data on the population-based prevalence of COPD in Nepal are very limited. This study aims to assess the prevalence of COPD and factors associated with the occurrence of COPD in Nepal.
Methods: From a nationally representative, population-based cross-sectional study on chronic non-communicable diseases, the prevalence of COPD and its associated factors was determined. Of 12,557 participants aged over 20 years, 8945 participants completed a questionnaire and spirometry. Eligible participants were also asked to answer a COPD diagnostic questionnaire for screening COPD cases, and if needed underwent pre-bronchodilator and post-bronchodilator spirometry. COPD was defined as a post-bronchodilator FEV1/FVC (forced expiratory volume in 1 s/forced vital capacity) ratio of < 0.70. Multivariate logistic regression was performed to identify factors associated with COPD. Sampling weights were used for all data analyses.
Results: The prevalence of COPD in Nepal was 11.7% (95% CI: 10.5% to 12.9 %), which increased with age, and higher in those with a low educational level, those who had smoked ≥ 50 pack-years, persons having a low body mass index (BMI), and residents of Karnali province. Multivariate analysis revealed that being aged 60 years and above, having a low BMI, low educational status, having smoked more than 50 pack-years, provincial distribution, and ethnicity were independent predictors of COPD.
Conclusion: COPD is a growing and serious public health issue in Nepal. Factor such as old age, cigarette smoking, low educational attainment, low BMI, ethnicity, and locality of residence (province-level variation) plays a vital role in the occurrence of COPD. Strategies aimed at targeting these risk factors through health promotion and education interventions are needed to decrease the burden of COPD.
Supported by the German Alliance Against Depression, 82 regions in Germany launched their own community-based multi-level intervention programs targeting both depression and suicidal behavior prior to January 2016. Sixteen of these regions have implemented the full 4-level intervention program comprising 1) training of General Practitioners, 2) a public awareness campaign, 3) training of community facilitators and 4) support for depressed patients and their relatives for at least three years. The aim of the study was to examine possible suicide prevention effects in these sixteen 4-level intervention regions (comprising a population of 6,976,309) by 1) comparing the annual suicide rates during the 3-year intervention period to a 10-year baseline and 2) comparing these differences to corresponding trends in Germany after excluding all intervention regions (Germany-IR). Primary outcome was the annual rate of suicides. Analyses included negative binomial regression models. When examining differences between suicide rates during the intervention period compared to the baseline period, only a trend towards a significant reduction was found. This reduction of suicides in the sixteen 4-level intervention regions did not differ from that in Germany-IR as control. The interpretation of these findings has to take into account that the training of General Practitioners, police and other community facilitators might have improved the recognition of suicides, thus increasing detection rates. Furthermore, destigmatizing effects of the public awareness campaigns might have increased the number of suicides by lowering suicide threshold (“normalization”) for those at risk and by decreasing the rate of suicides deliberately hidden by suicide victims or their relatives.
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.
The impact of GABAergic transmission on neuronal excitability depends on the Cl--gradient across membranes. However, the Cl--fluxes through GABAA receptors alter the intracellular Cl- concentration ([Cl-]i) and in turn attenuate GABAergic responses, a process termed ionic plasticity. Recently it has been shown that coincident glutamatergic inputs significantly affect ionic plasticity. Yet how the [Cl-]i changes depend on the properties of glutamatergic inputs and their spatiotemporal relation to GABAergic stimuli is unknown. To investigate this issue, we used compartmental biophysical models of Cl- dynamics simulating either a simple ball-and-stick topology or a reconstructed CA3 neuron. These computational experiments demonstrated that glutamatergic co-stimulation enhances GABA receptor-mediated Cl- influx at low and attenuates or reverses the Cl- efflux at high initial [Cl-]i. The size of glutamatergic influence on GABAergic Cl--fluxes depends on the conductance, decay kinetics, and localization of glutamatergic inputs. Surprisingly, the glutamatergic shift in GABAergic Cl--fluxes is invariant to latencies between GABAergic and glutamatergic inputs over a substantial interval. In agreement with experimental data, simulations in a reconstructed CA3 pyramidal neuron with physiological patterns of correlated activity revealed that coincident glutamatergic synaptic inputs contribute significantly to the activity-dependent [Cl-]i changes. Whereas the influence of spatial correlation between distributed glutamatergic and GABAergic inputs was negligible, their temporal correlation played a significant role. In summary, our results demonstrate that glutamatergic co-stimulation had a substantial impact on ionic plasticity of GABAergic responses, enhancing the attenuation of GABAergic inhibition in the mature nervous systems, but suppressing GABAergic [Cl-]i changes in the immature brain. Therefore, glutamatergic shift in GABAergic Cl--fluxes should be considered as a relevant factor of short-term plasticity.
Purpose: To compare the effective lens position (ELP), anterior chamber depth (ACD) changes, and visual outcomes in patients with and without pseudoexfoliation syndrome (PEX) after cataract surgery.
Design: Prospective, randomized, fellow-eye controlled clinical case series.
Methods: This prospective comparative case series enrolled 56 eyes of 56 consecutive patients with (n = 28) or without PEX (n = 28) and clinically significant cataract who underwent standard phacoemulsification and were implanted with single-piece acrylic posterior chamber intraocular lenses (IOLs). The primary outcome parameters were the ACD referring to the distance between the corneal anterior surface and the lens anterior surface, which is an indicator of the postoperative axial position of the IOL (the so-called ELP) and distance corrected visual acuity (DCVA).
Results: Before surgery, the ACD was 2.54 ± 0.42 mm in the PEX group and 2.53 ± 0.38 mm in the control group (p = 0.941). Postoperatively, the ACD was 4.29 ± 0.71 mm in the PEX group and 4.33 ± 0.72 mm in the normal group, respectively (p = 0.533). There was no significant difference in ACD changes between groups (PEX group: 1.75 ± 0.74 mm, control group: 1.81 ± 0.61 mm, p = 0.806) and DCVA pre- (p = 0.469) and postoperatively (PEX group: 0.11 ± 0.13 logMAR, control group: 0.09 ± 0.17 logMAR, p = 0.245) between groups.
Conclusion: Preoperative and postoperative ACD, as an indicator of ELP, between PEX eyes and healthy eyes after cataract surgery showed no significant difference. Phacoemulsification induced similar changes in eyes with PEX compared to healthy eyes.
Background: Sodium bituminosulfonate is derived from naturally occurring sulphur-rich oil shale and is used for the treatment of the inflammatory skin disease rosacea. Major molecular players in the development of rosacea include the release of enzymes that process antimicrobial peptides which, together with reactive oxygen species (ROS) and vascular endothelial growth factor (VEGF), promote pro-inflammatory processes and angiogenesis. The aim of this study was to address the molecular mechanism(s) underlying the therapeutic benefit of the formulation sodium bituminosulfonate dry substance (SBDS), which is indicated for the treatment of skin inflammation, including rosacea.
Methods: We investigated whether SBDS regulates the expression of cytokines, the release of the antimicrobial peptide LL-37, calcium mobilization, proteases (matrix metalloproteinase, elastase, kallikrein (KLK)5), VEGF or ROS in primary human neutrophils. In addition, activity assays with 5-lipoxygenase (5-LO) and recombinant human MMP9 and KLK5 were performed.
Results: We observed that SBDS reduces the release of the antimicrobial peptide LL-37, calcium, elastase, ROS and VEGF from neutrophils. Moreover, KLK5, the enzyme that converts cathelicidin to LL-37, and 5-LO that produces leukotriene (LT)A4, the precursor of LTB4, were both inhibited by SBDS with an IC50 of 7.6 μg/mL and 33 μg/mL, respectively.
Conclusion: Since LTB4 induces LL-37 which, in turn, promotes increased intracellular calcium levels and thereby, ROS/VEGF/elastase release, SBDS possibly regulates the LTB4/LL-37/calcium – ROS/VEGF/elastase axis by inhibiting 5-LO and KLK5. Additional direct effects on other pro-inflammatory pathways such as ROS generation cannot be ruled out. In summary, SBDS reduces the generation of inflammatory mediators from human neutrophils possibly accounting for its anti-inflammatory effects in rosacea.
Effects of foam rolling duration on tissue stiffness and perfusion: a randomized cross-over trial
(2021)
Despite its beneficial effects on flexibility and muscle soreness, there is still conflicting evidence regarding dose-response relationships and underlying mechanisms of foam rolling (FR). This study aimed to investigate the impact of different FR protocols on tissue perfusion and tissue stiffness. In a randomized crossover trial, two FR protocols (2x1 min, 2x3 min) were applied to the right anterior thigh of twenty healthy volunteers (11 females, 25 ± 4 years). Tissue perfusion (near infrared spectroscopy, NIRS) and stiffness (Tensiomyography, TMG and Myotonometry, MMT) were assessed before and after FR application. Variance analyses revealed a significant interaction of FR duration and tissue perfusion (F[1,19] = 7.098, p = 0.015). Local blood flow increased significantly from pre to post test (F[1,19] = 7.589, p = 0.013), being higher (Δ +9.7%) in the long-FR condition than in the short-FR condition (Δ +2.8%). Tissue stiffness (MMT) showed significant main effects for time (F[1,19] = 12.074, p = 0.003) and condition (F[1,19] = 7.165, p = 0.015) with decreases after short-FR (Δ -1.6%) and long-FR condition (Δ -1.9%). However, there was no time*dose-interaction (F[1,19] = 0.018, p = 0.895). No differences were found for TMG (p > 0.05). FR-induced changes failed to exceed the minimal detectable change threshold (MDC). Our data suggest that increased blood flow and altered tissue stiffness may mediate the effects of FR although statistical MDC thresholds were not achieved. Longer FR durations seem to be more beneficial for perfusion which is of interest for exercise professionals designing warm-up and cool-down regimes. Further research is needed to understand probable effects on parasympathetic outcomes representing systemic physiological responses to locally applied FR stimulations.
Graph data is an omnipresent way to represent information in machine learning. Especially, in neuroscience research, data from Diffusion-Tensor Imaging (DTI) and functional Magnetic Resonance Imaging (fMRI) is commonly represented as graphs. Exploiting the graph structure of these modalities using graph-specific machine learning applications is currently hampered by the lack of easy-to-use software. PHOTONAI Graph aims to close the gap between domain experts of machine learning, graph experts and neuroscientists. Leveraging the rapid machine learning model development features of the Python machine learning API PHOTONAI, PHOTONAI Graph enables the design, optimization, and evaluation of reliable graph machine learning models for practitioners. As such, it provides easy access to custom graph machine learning pipelines including, hyperparameter optimization and algorithm evaluation ensuring reproducibility and valid performance estimates. Integrating established algorithms such as graph neural networks, graph embeddings and graph kernels, it allows researchers without significant coding experience to build and optimize complex graph machine learning models within a few lines of code. We showcase the versatility of this toolbox by building pipelines for both resting–state fMRI and DTI data in the hope that it will increase the adoption of graph-specific machine learning algorithms in neuroscience research.
Context information supports serial dependence of multiple visual objects across memory episodes
(2019)
Visual perception operates in an object-based manner, by integrating associated features via attention. Working memory allows a flexible access to a limited number of currently relevant objects, even when they are occluded or physically no longer present. Recently, it has been shown that we compensate for small changes of an object’s feature over memory episodes, which can support its perceptual stability. This phenomenon was termed ‘serial dependence’ and has mostly been studied in situations that comprised only a single relevant object. However, since we are typically confronted with situations where several objects have to be perceived and held in working memory, the central question of how we selectively create temporal stability of several objects has remained unsolved. As different objects can be distinguished by their accompanying context features, like their color or temporal position, we tested whether serial dependence is supported by the congruence of context features across memory episodes. Specifically, we asked participants to remember the motion directions of two sequentially presented colored dot fields per trial. At the end of a trial one motion direction was cued for continuous report either by its color (Experiment 1) or serial position (Experiment 2). We observed serial dependence, i.e., an attractive bias of currently toward previously memorized objects, between current and past motion directions that was clearly enhanced when items had the same color or serial position across trials. This bias was particularly pronounced for the context feature that was used for cueing and for the target of the previous trial. Together, these findings demonstrate that coding of current object representations depends on previous representations, especially when they share similar content and context features. Apparently the binding of content and context features is not completely erased after a memory episode, but it is carried over to subsequent episodes. As this reflects temporal dependencies in natural settings, the present findings reveal a mechanism that integrates corresponding bundles of content and context features to support stable representations of individualized objects over time.
As the current SARS-CoV-2 pandemic continues, serological assays are urgently needed for rapid diagnosis, contact tracing and for epidemiological studies. So far, there is little data on how commercially available tests perform with real patient samples and if detected IgG antibodies provide protective immunity. Focusing on IgG antibodies, we demonstrate the performance of two ELISA assays (Euroimmun SARS-CoV-2 IgG & Vircell COVID-19 ELISA IgG) in comparison to one lateral flow assay ((LFA) FaStep COVID-19 IgG/IgM Rapid Test Device) and two in-house developed assays (immunofluorescence assay (IFA) and plaque reduction neutralization test (PRNT)). We tested follow up serum/plasma samples of individuals PCR-diagnosed with COVID-19. Most of the SARS-CoV-2 samples were from individuals with moderate to severe clinical course, who required an in-patient hospital stay.
For all examined assays, the sensitivity ranged from 58.8 to 76.5% for the early phase of infection (days 5-9) and from 93.8 to 100% for the later period (days 10-18) after PCR-diagnosed with COVID-19. With exception of one sample, all positive tested samples in the analysed cohort, using the commercially available assays examined (including the in-house developed IFA), demonstrated neutralizing (protective) properties in the PRNT, indicating a potential protective immunity to SARS-CoV-2. Regarding specificity, there was evidence that samples of endemic coronavirus (HCoV-OC43, HCoV-229E) and Epstein Barr virus (EBV) infected individuals cross-reacted in the ELISA assays and IFA, in one case generating a false positive result (may giving a false sense of security). This need to be further investigated.
Endothelial tip cells are essential for VEGF-induced angiogenesis, but underlying mechanisms are elusive. Endothelial-specific deletion of EVL, a member of the mammalian Ena/VASP protein family, reduced the expression of the tip cell marker protein endothelial cell specific molecule-1 (Esm1) and compromised the radial sprouting of the vascular plexus in the postnatal mouse retina. The latter effects could at least partly be attributed to reduced VEGF receptor 2 (VEGFR2) internalization and signaling but the underlying mechanisms(s) are not fully understood. In the present study, we revealed that the expression of the long non-coding RNA H19 was significantly reduced in endothelial cells from postnatal EVL-/- mice and in siRNA-transfected human endothelial cells under hypoxic conditions. H19 was recently shown to promote VEGF expression and bioavailability via Esm1 and hypoxia inducible factor 1α (HIF-1α). Similar to EVL-/- mice, the radial outgrowth of the vascular plexus was significantly delayed in the postnatal retina of H19-/- mice. In summary, our data suggests that loss of EVL not only impairs VEGFR2 internalition and downstream signaling, but also impairs VEGF expression and bioavailability in the hypoxic retina via downregulation of lncRNA H19.
The incidence of FIX inhibitors in severe hemophilia B (SHB) is not well defined. Frequencies of 3-5% have been reported but most studies to date were small, including patients with different severities, and without prospective follow-up for inhibitor incidence. Study objective was to investigate inhibitor incidence in patients with SHB followed up to 500 exposure days (ED), the frequency of allergic reactions, and the relationship with genotypes. Consecutive previously untreated patients (PUPs) with SHB enrolled into the PedNet cohort were included. Detailed data was collected for the first 50 ED, followed by annual collection of inhibitor status and allergic reactions. Presence of inhibitors was defined by at least two consecutive positive samples. Additionally, data on factor IX gene mutation was collected. 154 PUPs with SHB were included; 75% were followed until 75 ED, and 43% until 500 ED. Inhibitors developed in 14 patients (7 high-titre). Median number of ED at inhibitor manifestation was 11 (IQR 6.5-36.5). Cumulative inhibitor incidence was 9.3% (95%CI 4.4-14.1) at 75 ED, and 10.2% (5.1-15.3) at 500 ED. Allergic reactions occurred in 4 (28.6%) inhibitor patients. Missense mutations were most frequent (46.8%) overall but not associated with inhibitors. Nonsense mutations and deletions with large structural changes comprised all mutations among inhibitor patients and were associated with an inhibitor risk of 26.9% and 33.3%, respectively. In an unselected, well-defined cohort of PUPs with SHB, cumulative inhibitor incidence was 10.2% at 500 ED. Nonsense mutations and large deletions were strongly associated with the risk of inhibitor development. The PedNet Registry is registered at clinicaltrials.gov; identifier: NCT02979119
Hyperhomocysteinemia has been suggested potentially to contribute to a variety of pathologies, such as Alzheimer’s disease (AD). While the impact of hyperhomocysteinemia on AD has been investigated extensively, there are scarce data on the effect of AD on hyperhomocysteinemia. The aim of this in vivo study was to investigate the kinetics of homocysteine (HCys) and homocysteic acid (HCA) and effects of AD-like pathology on the endogenous levels. The mice received a B-vitamin deficient diet for eight weeks, followed by the return to a balanced control diet for another eight weeks. Serum, urine, and brain tissues of AppNL-G-F knock-in and C57BL/6J wild type mice were analyzed for HCys and HCA using LC-MS/MS methods. Hyperhomocysteinemic levels were found in wild type and knock-in mice due to the consumption of the deficient diet for eight weeks, followed by a rapid normalization of the levels after the return to control chow. Hyperhomocysteinemic AppNL-G-F mice had significantly higher HCys in all matrices, but not HCA, compared to wild type control. Higher serum concentrations were associated with elevated levels in both the brain and in urine. Our findings confirm a significant impact of AD-like pathology on hyperhomocysteinemia in the AppNL-G-F mouse model. The immediate normalization of HCys and HCA after the supply of B-vitamins strengthens the idea of a B-vitamin intervention as a potentially preventive treatment option for HCys-related disorders such as AD.
Introduction: Cell salvage (CS) is an integral part of patient blood management (PBM) and aims to reduce allogeneic red blood cell (RBC) transfusion.
Material and methods: This observational study analysed patients scheduled for elective cardiac surgery requiring cardiopulmonary bypass (CPB) between November 2015 and October 2018. Patients were divided into a CS group (patients receiving CS) and a control group (no CS). Primary endpoints were the number of patients exposed to allogeneic RBC transfusions and the number of RBC units transfused per patient.
Results: A total of 704 patients undergoing cardiac surgery were analysed, of whom 338 underwent surgery with CS (CS group) and 366 were without CS (control group). Intraoperatively, 152 patients (45%) were exposed to allogeneic RBC transfusions in the CS group and 93 patients (25%) in the control group (P < 0.001). Considering the amount of intraoperative blood loss, regression analysis revealed a significant association between blood loss and increased use of RBC units in patients of the control compared to the CS group (1000 mL: 1.0 vs. 0.6 RBC units; 2000 mL: 2.2 vs. 1.1 RBC units; 3000 mL: 3.4 vs. 1.6 RBC units). Thus, CS was significantly associated with a reduced number of allogeneic RBCs by 40% for 1000 mL, 49% for 2000 mL, and 52% for 3000 mL of blood loss compared to patients without CS.
Conclusions: Cell salvage was significantly associated with a reduced number of allogeneic RBC transfusions. It supports the beneficial effect of CS in cardiac surgical patients as an individual measure in a comprehensive PBM program.
Objective To explore factors that potentially impact external validation performance while developing and validating a prognostic model for hospital admissions (HAs) in complex older general practice patients.
Study design and setting Using individual participant data from four cluster-randomised trials conducted in the Netherlands and Germany, we used logistic regression to develop a prognostic model to predict all-cause HAs within a 6-month follow-up period. A stratified intercept was used to account for heterogeneity in baseline risk between the studies. The model was validated both internally and by using internal-external cross-validation (IECV).
Results Prior HAs, physical components of the health-related quality of life comorbidity index, and medication-related variables were used in the final model. While achieving moderate discriminatory performance, internal bootstrap validation revealed a pronounced risk of overfitting. The results of the IECV, in which calibration was highly variable even after accounting for between-study heterogeneity, agreed with this finding. Heterogeneity was equally reflected in differing baseline risk, predictor effects and absolute risk predictions.
Conclusions Predictor effect heterogeneity and differing baseline risk can explain the limited external performance of HA prediction models. With such drivers known, model adjustments in external validation settings (eg, intercept recalibration, complete updating) can be applied more purposefully.
Trial registration number PROSPERO id: CRD42018088129.
Rationale: Reactive oxygen species (ROS) and reactive nitrogen species (RNS) are important regulators of inflammation. The exact impact of ROS/RNS on cutaneous delayed-type hypersensitivity reaction (DTHR) is controversial. The aim of our study was to identify the dominant sources of ROS/RNS during acute and chronic trinitrochlorobenzene (TNCB)-induced cutaneous DTHR in mice with differently impaired ROS/RNS production.
Methods: TNCB-sensitized wild-type, NADPH oxidase 2 (NOX2)- deficient (gp91phox-/-), myeloperoxidase-deficient (MPO-/-), and inducible nitric oxide synthase-deficient (iNOS-/-) mice were challenged with TNCB on the right ear once to elicit acute DTHR and repetitively up to five times to induce chronic DTHR. We measured ear swelling responses and noninvasively assessed ROS/RNS production in vivo by employing the chemiluminescence optical imaging (OI) probe L-012. Additionally, we conducted extensive ex vivo analyses of inflamed ears focusing on ROS/RNS production and the biochemical and morphological consequences.
Results: The in vivo L-012 OI of acute and chronic DTHR revealed completely abrogated ROS/RNS production in the ears of gp91phox-/- mice, up to 90 % decreased ROS/RNS production in the ears of MPO-/- mice and unaffected ROS/RNS production in the ears of iNOS-/- mice. The DHR flow cytometry analysis of leukocytes derived from the ears with acute DTHR confirmed our in vivo L-012 OI results. Nevertheless, we observed no significant differences in the ear swelling responses among all the experimental groups. The histopathological analysis of the ears of gp91phox-/- mice with acute DTHRs revealed slightly enhanced inflammation. In contrast, we observed a moderately reduced inflammatory immune response in the ears of gp91phox-/- mice with chronic DTHR, while the inflamed ears of MPO-/- mice exhibited the strongest inflammation. Analyses of lipid peroxidation, 8-hydroxy-2'deoxyguanosine levels, redox related metabolites and genomic expression of antioxidant proteins revealed similar oxidative stress in all experimental groups. Furthermore, inflamed ears of wild-type and gp91phox-/- mice displayed neutrophil extracellular trap (NET) formation exclusively in acute but not chronic DTHR.
Conclusions: MPO and NOX2 are the dominant sources of ROS/RNS in acute and chronic DTHR. Nevertheless, depletion of one primary source of ROS/RNS exhibited only marginal but conflicting impact on acute and chronic cutaneous DTHR. Thus, ROS/RNS are not a single entity, and each species has different properties at certain stages of the disease, resulting in different outcomes.
Background: As adults with congenital heart disease (ACHD) are getting older, acquired comorbidities play an important role in morbidity and mortality. Data regarding their prevalence in ACHD that are representative on a population level are not available. Methods: The German National Register for Congenital Heart Defects was screened for ACHD. Underlying congenital heart disease (CHD), patient demographics, previous interventional/surgical interventions, and comorbidities were retrieved. Patients <40 years of age were compared to those ≥40 years. Results: A total of 4673 patients (mean age 33.6 ± 10.7 years, female 47.7%) was included. At least one comorbidity was present in 2882 patients (61.7%) altogether, and in 56.8% of patients below vs. 77.7% of patients over 40 years of age (p < 0.001). Number of comorbidities was higher in patients ≥40 years (2.1 ± 2.1) than in patients <40 years (1.2 ± 1.5, p < 0.001). On multivariable regression analysis, age and CHD complexity were significantly associated with the presence and number of comorbidities. Conclusions: At least one acquired comorbidity is present in approximately two-thirds of ACHD. Age and complexity of the CHD are significantly associated with the presence of comorbidities. These findings highlight the importance of addressing comorbidities in ACHD care to achieve optimal long-term outcomes.
Surviving death: emerging concepts of RIPK3 and MLKL ubiquitination in the regulation of necroptosis
(2021)
Lytic forms of programmed cell death, like necroptosis, are characterised by cell rupture and the release of cellular contents, often provoking inflammatory responses. In the recent years, necroptosis has been shown to play important roles in human diseases like cancer, infections and ischaemia/reperfusion injury. Coordinated interactions between RIPK1, RIPK3 and MLKL lead to the formation of a dedicated death complex called the necrosome that triggers MLKL-mediated membrane rupture and necroptotic cell death. Necroptotic cell death is tightly controlled by post-translational modifications, among which especially phosphorylation has been characterised in great detail. Although selective ubiquitination is relatively well-explored in the early initiation stages of necroptosis, the mechanisms and functional consequences of RIPK3 and MLKL ubiquitination for necrosome function and necroptosis are only starting to emerge. This review provides an overview on how site-specific ubiquitination of RIPK3 and MLKL regulates, fine-tunes and reverses the execution of necroptotic cell death.
Immune profile and radiological characteristics of progressive multifocal leukoencephalopathy
(2021)
Background and purpose: Progressive multifocal leukoencephalopathy (PML) constitutes a severe disease with increasing incidence, mostly in the context of immunosuppressive therapies. A detailed understanding of immune response in PML appears critical for the treatment strategy. The aim was a comprehensive immunoprofiling and radiological characterization of magnetic resonance imaging (MRI) defined PML variants.
Methods: All biopsy-confirmed PML patients (n = 15) treated in our department between January 2004 and July 2019 were retrospectively analysed. Data from MRI, histology as well as detailed clinical and outcome data were collected. The MRI-defined variants of classical (cPML) and inflammatory (iPML) PML were discriminated based on the intensity of gadolinium enhancement. In these PML variants, intensity and localization (perivascular vs. parenchymal) of inflammation in MRI and histology as well as the cellular composition by immunohistochemistry were assessed. The size of the demyelinating lesions was correlated with immune cell infiltration.
Results: Patients with MRI-defined iPML showed a stronger intensity of inflammation with an increased lymphocyte infiltration on histological level. Also, iPML was characterized by a predominantly perivascular inflammation. However, cPML patients also demonstrated certain inflammatory tissue alterations. Infiltration of CD163-positive microglia and macrophage (M/M) subtypes correlated with PML lesion size.
Conclusions: The non-invasive MRI-based discrimination of PML variants allows for an estimation of inflammatory tissue alterations, although exhibiting limitations in MRI-defined cPML. The association of a distinct phagocytic M/M subtype with the extent of demyelination might reflect disease progression.
We present the case of an adult male patient with an incomplete form of Shone’s complex associated with bicuspid aortic valve and a double orifice mitral valve. Intraoperative inspection of the mitral valve showed double orifice configuration with a small, rudimentary left-sided mitral valve and a large, dominant, right-sided parachute mitral valve with Barlow-type of degeneration. The patient underwent reconstruction of both valves through a minimally invasive incision. At one year echocardiographic control both valves function normally.
The present guidelines comprise relevant aspects of the use of compression therapy with medical compression stockings (MCS), phlebological compression bandages (PCB), and medical adaptive compression systems (MAC) based on an extensive literature search based on the state of scientific knowledge as of December 2018.
These guidelines were prepared by experts within the framework of an electronic consensus process and a consensus conference which took place in Bielefeld, Germany, on September 27, 2018, on the initiative of the German Society of Phlebology (DGP) and the Professional Association of Phlebologists (BVP). The guidelines were adopted by the boards and advisory councils of the DGP and the BVP, and of the participating professional associations, after preparation by the group of experts and extensive debate, on December 31, 2018.
These guidelines do not cover compression therapy with medical thrombosis prophylaxis stockings (MTPS) or with intermittent pneumatic compression (IPC), which are treated in other guidelines (AWMF 003-001, S3; AWMF 037-001, S1).
The recommendations of the AWMF guidelines “Diagnostics and Treatment of Lymphedema” (registration number 058-001) and “Lipedema” (registration number 037-012) shall also be taken into account where appropriate: https://www.awmf.org/uploads/tx_szleitlinien/058-001l_S2k_Diagnostik_und_Therapie_der_Lymphoedeme_2017-05.pdf, https://www.awmf.org/uploads/tx_szleitlinien/037-012l_S1_Lipoedem_2016-01.pdf.
Purpose: Dosimetric treatment planning evaluations concerning patient-adapted moulds for iridium-192 highdose-rate brachytherapy are presented in this report.
Material and methods: Six patients with perinasal skin tumors were treated with individual moulds made of biocompatible epithetic materials with embedded plastic applicators. Treatment plans were optimized with regard to clinical requirements, and dose was calculated using standard water-based TG-43 formalism. In addition, retrospective material-dependent collapsed cone calculations according to TG-186 protocol were evaluated to quantify the limitations of TG-43 protocol for this superficial brachytherapy technique.
Results: The dose-volume parameters D90, V100, and V150 of the planning target volumes (PTVs) for TG-43 dose calculations yielded 92.2% to 102.5%, 75.1% to 93.1%, and 7.4% to 41.7% of the prescribed dose, respectively. The maximum overall dose to the ipsilateral eyeball as the most affected organ at risk (OAR) varied between 8.9 and 36.4 Gy. TG-186 calculations with Hounsfield unit-based density allocation resulted in down by –6.4%, –16.7%, and –30.0% lower average D90, V100, and V150 of the PTVs, with respect to the TG-43 data. The corresponding calculated OAR doses were also lower. The model-based TG-186 dose calculations have considered reduced backscattering due to environmental air as well as the dose-to-medium influenced by the mould materials and tissue composition. The median PTV dose was robust within 0.5% for simulated variations of mould material densities in the range of 1.0 g/cm³ to 1.26 g/cm³ up to 7 mm total mould thickness.
Conclusions: HDR contact BT with individual moulds is a safe modality for routine treatment of perinasal skin tumors. The technique provides good target coverage and OARs’ protection, while being robust against small variances in mould material density. Model-based dose calculations (TG-186) should complement TG-43 dose calculations for verification purpose and quality improvement.
Sowohl die Lebenserwartung als auch die Prävalenz HIV-infizierter Patient*innen ist stetig ansteigend,aufgrund der HAART und durch verbesserte diagnostische Methoden. Nicht-AIDS-definierenden Erkrankungen sind heutzutage die führenden Todesursachen. Durch verzögerte Diagnosestellung und zurückhaltenden Therapien gynäkologischer Malignome ist die Prognose im Vergleich zur Normalbevölkerung schlechter.
In dieser retrospektiven Fall-Kontroll-Studie des Universitätsklinikums Frankfurt am Mains wurden die Therapie und das Outcome gynäkologischer Malignome von 23 HIV-infizierten Patientinnen aus den Jahren 2009-2019 mit einer Kontrollgruppe aus dem gynäkologischen Krebszentrum der Klinik Essen Mitte verglichen, um herauszufinden, inwiefern eine HIV-Infektion das Outcome der Patientinnen beeinflusst.
Das gynäkologische Malignom, dominierend das Zervixkarzinom, trat durchschnittlich ein Jahrzehnt nach der HIV-Diagnose auf. Im Unterschied zu anderen Studien, ist unser Kollektiv überwiegend hellhäutig. Ein bekannter Drogenabusus ist häufig und zusammenhängend mit weiteren Koinfektionen.
Die HIV-Erkrankung ist bei mehr als der Hälfte der Patientinnen bereits fortgeschritten, jedoch ließ sich kein Zusammenhang zwischen dem Auftreten gynäkologischer Malignome und einer CD4-Zellzahl <500 CD4-Zellen/µl nachweisen. Die antiretrovirale Therapie entsprach größtenteils nicht den aktuellen Leitlinien.
Bis auf fünf Frauen wurden alle Frauen leitliniengerecht therapiert. Eine Korrelation zwischen der Therapie und der Tumorentität, der CD4-Zellzahl, dem Alter oder dem Stadium des Malignoms konnte nicht gezeigt werden.
Insgesamt liegt die 5-Jahresüberlebensrate der Kohorte bei 74.8%. Eine nicht leitliniengerechte Therapie ist nicht direkt mit einem schlechteren Outcome verbunden, jedoch mit einem weitaus kürzeren Follow-Up-Zeitraum von durchschnittlich 0.22 Jahren im Vergleich zu 4.85 Jahren bei leitlinienkonform therapierten Patientinnen. Es liegt ein statistisch signifikanter Unterschied zwischen der Kontrollgruppe und unserer Kohorte vor, sodass angenommen werden kann, dass bei Vorliegen einer HIV-Infektion die Therapie des gynäkologischen Malignoms häufiger nicht leitliniengerecht ist.
Bislang existieren nur wenige Studien, die die Therapie und das Outcome gynäkologischer Malignome bei HIV-infizierten Patientinnen untersuchen. Die Interaktion einer ART mit antineoplastischen Medikamenten und die Anwendung von Checkpointinhibitoren und einer „targeted therapy“ sollten Gegenstand weiterer Untersuchungen sein. Dafür sollten HIV-Patientinnen in Therapiestudien inkludiert werden, sodass geeignete Leitlinien erarbeitet werden können.
Introduction: In recent years, resource-saving handling of allogeneic blood products and a reduction of transfusion rates in adults has been observed. However, comparable published national data for transfusion practices in pediatric patients are currently not available. In this study, the transfusion rates for children and adolescents were analyzed based on data from the Federal Statistical Office of Germany during the past 2 decades. Methods: Data were queried via the database of the Federal Statistical Office (Destasis). The period covered was from 2005 to 2018, and those in the sample group were children and adolescents aged 0–17 years receiving inpatient care. Operation and procedure codes (OPS) for transfusions, procedures, or interventions with increased transfusion risk were queried and evaluated in detail. Results: In Germany, 0.9% of the children and adolescents treated in hospital received a transfusion in 2018. A reduction in transfusion rates from 1.02% (2005) to 0.9% (2018) was observed for the total collective of children and adolescents receiving inpatient care. Increases in transfusion rates were recorded for 1- to 4- (1.41–1.45%) and 5- to 10-year-olds (1.24–1.33%). Children under 1 year of age were most frequently transfused (in 2018, 40.2% of the children were cared for in hospital). Transfusion-associated procedures such as chemotherapy or machine ventilation and respiratory support for newborns and infants are on the rise. Conclusion: Transfusion rates are declining in children and adolescents, but the reasons for increases in transfusion rates in other groups are unclear. Prospective studies to evaluate transfusion rates and triggers in children are urgently needed.
Background: Plasma transfusions are most commonly used therapeutically for bleeding or prophylactically in non-bleeding patients prior to invasive procedures or surgery. Although plasma transfusions generally seem to decline, plasma usage for indications that lack evidence of efficacy prevail. Summary: There is wide international, interinstitutional, and interindividual variance regarding the compliance with guidelines based on published references, supported by appropriate testing. There is furthermore a profound lack of evidence from randomized controlled trials comparing the effect of plasma transfusion with that of other therapeutic interventions for most indications, including massive bleeding. The expected benefit of a plasma transfusion needs to be balanced carefully against the associated risk of adverse events. In light of the heterogeneous nature of bleeding conditions and their rapid evolvement over time, fibrinogen and factor concentrate therapy, directed at specific phases of coagulation identified by alternative laboratory assays, may offer advantages over conventional blood product ratio-driven resuscitation. However, their outcome benefit has not been demonstrated in well-powered prospective trials. This systematic review will detail the current evidence base for plasma transfusion in adult surgical patients.
Based on Eysenck’s biopsychological trait theory, brain arousal has long been considered to explain individual differences in human personality. Yet, results from empirical studies remained inconclusive. However, most published results have been derived from small samples and, despite inherent limitations, EEG alpha power has usually served as an exclusive indicator for brain arousal. To overcome these problems, we here selected N = 468 individuals of the LIFE-Adult cohort and investigated the associations between the Big Five personality traits and brain arousal by using the validated EEG- and EOG-based analysis tool VIGALL. Our analyses revealed that participants who reported higher levels of extraversion and openness to experience, respectively, exhibited lower levels of brain arousal in the resting state. Bayesian and frequentist analysis results were especially convincing for openness to experience. Among the lower-order personality traits, we obtained the strongest evidence for neuroticism facet ‘impulsivity’ and reduced brain arousal. In line with this, both impulsivity and openness have previously been conceptualized as aspects of extraversion. We regard our findings as well in line with the postulations of Eysenck and consistent with the recently proposed ‘arousal regulation model’. Our results also agree with meta-analytically derived effect sizes in the field of individual differences research, highlighting the need for large (collaborative) studies.
Aims: Chronic pressure or volume overload induce concentric vs. eccentric left ventricular (LV) remodelling, respectively. Previous studies suggest that distinct signalling pathways are involved in these responses. NADPH oxidase-4 (Nox4) is a reactive oxygen species-generating enzyme that can limit detrimental cardiac remodelling in response to pressure overload. This study aimed to assess its role in volume overload-induced remodelling.
Methods and results: We compared the responses to creation of an aortocaval fistula (Shunt) to induce volume overload in Nox4-null mice (Nox4−/−) vs. wild-type (WT) littermates. Induction of Shunt resulted in a significant increase in cardiac Nox4 mRNA and protein levels in WT mice as compared to Sham controls. Nox4−/− mice developed less eccentric LV remodelling than WT mice (echocardiographic relative wall thickness: 0.30 vs. 0.27, P < 0.05), with less LV hypertrophy at organ level (increase in LV weight/tibia length ratio of 25% vs. 43%, P < 0.01) and cellular level (cardiomyocyte cross-sectional area: 323 µm2 vs. 379 μm2, P < 0.01). LV ejection fraction, foetal gene expression, interstitial fibrosis, myocardial capillary density, and levels of myocyte apoptosis after Shunt were similar in the two genotypes. Myocardial phospho-Akt levels were increased after induction of Shunt in WT mice, whereas levels decreased in Nox4−/− mice (+29% vs. −21%, P < 0.05), associated with a higher level of phosphorylation of the S6 ribosomal protein (S6) and the eIF4E-binding protein 1 (4E-BP1) in WT compared to Nox4−/− mice. We identified that Akt activation in cardiac cells is augmented by Nox4 via a Src kinase-dependent inactivation of protein phosphatase 2A.
Conclusion: Endogenous Nox4 is required for the full development of eccentric cardiac hypertrophy and remodelling during chronic volume overload. Nox4-dependent activation of Akt and its downstream targets S6 and 4E-BP1 may be involved in this effect.
Management of decompensated cirrhosis is currently geared towards the treatment of complications once they occur. To date there is no established disease-modifying therapy aimed at halting progression of the disease and preventing the development of complications in patients with decompensated cirrhosis. The design of clinical trials to investigate new therapies for patients with decompensated cirrhosis is complex. The population of patients with decompensated cirrhosis is heterogeneous (i.e., different etiologies, comorbidities and disease severity), leading to the inclusion of diverse populations in clinical trials. In addition, primary endpoints selected for trials that include patients with decompensated cirrhosis are not homogeneous and at times may not be appropriate. This leads to difficulties in comparing results obtained from different trials. Against this background, the LiverHope Consortium organized a meeting of experts, the goal of which was to develop recommendations for the design of clinical trials and to define appropriate endpoints, both for trials aimed at modifying the natural history and preventing progression of decompensated cirrhosis, as well as for trials aimed at managing the individual complications of cirrhosis.
Objective: Ligelizumab is a humanised IgG1 anti-IgE antibody that binds IgE with higher affinity than omalizumab. Ligelizumab had greater efficacy than omalizumab on inhaled and skin allergen provocation responses in mild allergic asthma. This multi-centre, randomised, double-blind study was designed to test ligelizumab in severe asthma patients not adequately controlled with high-dose inhaled corticoids plus long-acting β2-agonist.
Methods: Patients received 16 weeks ligelizumab (240 mg q2w), omalizumab or placebo subcutaneously, and ACQ-7 was measured as primary outcome at Week 16. In addition, the study generated dose-ranging data of ligelizumab and safety data.
Results: A total of 471 patients, age 47.4 ± 13.36 years, were included in the study. Treatment with ligelizumab did not significantly improve asthma control (ACQ-7) and exacerbation rates compared to omalizumab and placebo. Therefore, primary and secondary objectives of the study were not met. The compound was well tolerated, and the safety profile showed no new safety findings. Pharmacokinetic data demonstrated faster clearance and lower serum concentrations of ligelizumab than historical omalizumab data, and exploratory in vitro data showed differential IgE blocking properties relative to FcεRI and FcεRII/CD23 between the two compounds.
Conclusion: Ligelizumab failed to demonstrate superiority over placebo or omalizumab. Although ligelizumab is more potent than omalizumab at inhibiting IgE binding to the high-affinity FcεRI, there is differential IgE blocking properties relative to FcεRI and FcεRII/CD23 between the two compounds. Therefore, the data suggest that different anti-IgE antibodies might be selectively efficacious for different IgE-mediated diseases.
Tiotropium as an add-on treatment option for severe uncontrolled asthma in preschool patients
(2021)
Background: Toddlers with asthma suffer disproportionally more than school-aged children from exacerbations with emergency visits and hospital admissions despite inhaled corticosteroid (ICS) treatment. A recent trial for children ≤ 5 years showed tolerability of tiotropium and potential to reduce asthma-related events.
Methods: We conducted a retrospective analysis of electronic outpatient records (2017‒2019) of children < 6 years treated with ICS plus long-acting β2-agonists (LABAs) plus tiotropium as an add-on for uncontrolled severe asthma. The primary endpoint was a comparison of systemic corticosteroid (SCS) prescriptions 6 months before and after ICS/LABA/tiotropium start. Secondary endpoints included physician visits, hospitalisations and antibiotic prescriptions. We compared outcomes with children without asthma matched for age, sex, season and screening date.
Results: Compared with a mean 2.42 (95% CI: 1.75, 3.36) SCS courses per patient within 6 months prior to ICS/LABA/tiotropium, 0.74 (95% CI: 0.25, 1.08) SCS courses per patient were prescribed within 6 months after starting ICS/LABA/tiotropium (P< 0.001). Physician visits dropped from 9.23 (95% CI: 7.15, 12.72) to 5.76 (95% CI: 3.10, 7.70) per patient (P< 0.01). Nineteen hospitalisations were recorded 6 months before ICS/LABA/tiotropium compared with one hospitalisation after (P< 0.01). A mean 1.79 antibiotic courses (95% CI: 1.22, 2.23) per patient were prescribed before ICS/LABA/tiotropium compared with 0.74 (95% CI: 0.22, 1.00) after ICS/LABA/tiotropium (P< 0.001). Hospitalisation rates for patients at observation end were not statistically different from healthy controls before/after matching.
Interpretation: Our retrospective study showed that adding tiotropium to ICS/LABA is a new treatment option for patients with severe preschool asthma; however, larger confirmatory studies are needed.
Protein post-translational modification with ubiquitin (Ub) is a versatile signal regulating almost all aspects of cell biology, and an increasing range of diseases is associated with impaired Ub modification. In this light, the Ub system offers an attractive, yet underexplored route to the development of novel targeted treatments. A promising strategy for small molecule intervention is posed by the final components of the enzymatic ubiquitination cascade, E3 ligases, as they determine the specificity of the protein ubiquitination pathway. Here, we present UbSRhodol, an autoimmolative Ub-based probe, which upon E3 processing liberates the pro-fluorescent dye, amenable to profile the E3 transthiolation activity for recombinant and in cell-extract E3 ligases. UbSRhodol enabled detection of changes in transthiolation efficacy evoked by enzyme key point mutations or conformational changes, and offers an excellent assay reagent amenable to a high-throughput screening setup allowing the identification of small molecules modulating E3 activity.
The LiverTox database compiles cases of idiosyncratic drug-induced liver injury (iDILI) with the promised aims to help identify hepatotoxicants and provide evidence-based information on iDILI. Weaknesses of this approach include case selection merely based on published case number and not on a strong causality assessment method such as the Roussel Uclaf Causality Assessment Method (RUCAM). The aim of this analysis was to find out whether the promised aims have been achieved by comparison of current iDILI case data with those promised in 2012 in LiverTox. First, the LiverTox criteria of likelihood categories applied to iDILI cases were analyzed regarding robustness. Second, the quality was analyzed in LiverTox cases caused by 46 selected drugs implicated in iDILI. LiverTox included iDILI cases of insufficient quality because most promised details were not fulfilled: (1) Standard liver injury definition; (2) incomplete narratives or inaccurate for alternative causes; and (3) not a single case was assessed for causality with RUCAM, as promised. Instead, causality was arbitrarily judged on the iDILI case number presented in published reports with the same drug. All of these issues characterize the paradox of LiverTox, requiring changes in the method to improve data quality and database reliability. In conclusion, establishing LiverTox is recognized as a valuable effort, but the paradox due to weaknesses between promised data quality and actual data must be settled by substantial improvements, including, for instance, clear definition and identification of iDILI cases after evaluation with RUCAM to establish a robust causality grading.
The increasing use of targeted therapy (TT) has resulted in prolonged disease control and survival in many metastatic cancers. In parallel, stereotactic radiotherapy (SRT) is increasingly performed in patients receiving TT to obtain a durable control of resistant metastases, and thereby to prolong the time to disseminated disease progression and switch of systemic therapy. The aims of this study were to analyze the safety and efficacy of SRT combined with TT in metastatic cancer patients and to assess the influence of continuous vs. interrupted TT during metastasis-directed SRT. The data of 454 SRTs in 158 patients from the international multicenter database (TOaSTT) on metastatic cancer patients treated with SRT and concurrent TT (within 30 days) were analyzed using Kaplan–Meier and log rank testing. Toxicity was defined by the CTCAE v4.03 criteria. The median FU was 19.9 mo (range 1–102 mo); 1y OS, PFS and LC were 59%, 24% and 84%, respectively. Median TTS was 25.5 mo (95% CI 11–40). TT was started before SRT in 77% of patients. TT was interrupted during SRT in 44% of patients, with a median interruption of 7 (range 1–42) days. There was no significant difference in OS or PFS whether TT was temporarily interrupted during SRT or not. Any-grade acute and late SRT-related toxicity occurred in 63 (40%) and 52 (33%) patients, respectively. The highest toxicity rates were observed for the combination of SRT and EGFRi or BRAF/MEKi, and any-grade toxicity was significantly increased when EGFRi (p = 0.016) or BRAF/MEKi (p = 0.009) were continued during SRT. Severe (≥grade 3) acute and late SRT-related toxicity were observed in 5 (3%) and 7 (4%) patients, respectively, most frequently in patients treated with EGFRi or BRAF/MEKi and in the intracranial cohort. There was no significant difference in severe toxicity whether TT was interrupted before and after SRT or not. In conclusion, SRT and continuous vs. interrupted TT in metastatic cancer patients did not influence OS or PFS. Overall, severe toxicity of combined treatment was rare; a potentially increased toxicity after SRT and continuous treatment with EGFR inhibitors or BRAF(±MEK) inhibitors requires further evaluation.
Pandemic SARS-CoV-2 causes a mild to severe respiratory disease called coronavirus disease 2019 (COVID-19). While control of the SARS-CoV-2 spread partly depends on vaccine-induced or naturally acquired protective herd immunity, antiviral strategies are still needed to manage COVID-19. Enisamium is an inhibitor of influenza A and B viruses in cell culture and clinically approved in countries of the Commonwealth of Independent States. In vitro, enisamium acts through metabolite VR17-04 and inhibits the activity of the influenza A virus RNA polymerase. Here we show that enisamium can inhibit coronavirus infections in NHBE and Caco-2 cells, and the activity of the SARS-CoV-2 RNA polymerase in vitro. Docking and molecular dynamics simulations provide insight into the mechanism of action and indicate that enisamium metabolite VR17-04 prevents GTP and UTP incorporation. Overall, these results suggest that enisamium is an inhibitor of SARS-CoV-2 RNA synthesis in vitro.
Sickle Cell Disease (SCD) is the most common monogenic disorder globally but qualifies as a rare disease in Germany. In 2012, the German Society for Paediatric Oncology and Haematology (GPOH) mandated a consortium of five university hospitals to develop a disease management program for patients with SCD. Besides other activities, this consortium issued treatment guidelines for SCD that strongly favour the use of hydroxyurea and propagated these guidelines in physician and patient education events. In order to quantify the effect of these recommendations, we made use of claims data that were collected by the research institute (WIdO) of the major German insurance company, the Allgemeine Ortskrankenkasse (AOK), and of publicly accessible data collected by the Federal Statistical Office (Statistisches Bundesamt, Destatis). While the number of patients with SCD in Germany increased from approximately 2200 in 2011 to approximately 3200 in 2019, important components of the recently issued treatment guidelines have been largely implemented. Specifically, the use of hydroxyurea has more than doubled, resulting in a proportion of approximately 44% of all patients with SCD being treated with hydroxyurea in 2019. In strong negative correlation with the use of hydroxyurea, the frequency of acute chest syndromes decreased. Similarly, the proportion of patients who required analgesics and hospitals admissions declined. In sum, these data demonstrate an association between the dissemination of treatment guidelines and changes in clinical practice. The close temporal relationship between the increased use of hydroxyurea and the reduction in the incidence of acute chest syndrome in a representative population-based analysis implies that these changes in clinical practice contributed to an improvement in key measures of disease activity.
Introduction: Information on the long-term performance of biosynthetic meshes is scarce. This study analyses the performance of biosynthetic mesh (Phasix™) over 24 months.
Methods: A prospective, international European multi-center trial is described. Adult patients with a Ventral Hernia Working Group (VHWG) grade 3 incisional hernia larger than 10 cm2, scheduled for elective repair, were included. Biosynthetic mesh was placed in sublay position. Short-term outcomes included 3-month surgical site occurrences (SSO), and long-term outcomes comprised hernia recurrence, reoperation, and quality of life assessments until 24 months.
Results: Eighty-four patients were treated with biosynthetic mesh. Twenty-two patients (26.2%) developed 34 SSOs, of which 32 occurred within 3 months (primary endpoint). Eight patients (11.0%) developed a hernia recurrence. In 13 patients (15.5%), 14 reoperations took place, of which 6 were performed for hernia recurrence (42.9%), 3 for mesh infection (21.4%), and in 7 of which the mesh was explanted (50%). Compared to baseline, quality of life outcomes showed no significant difference after 24 months. Despite theoretical resorption, 10.7% of patients reported presence of mesh sensation in daily life 24 months after surgery.
Conclusion: After 2 years of follow-up, hernia repair with biosynthetic mesh shows manageable SSO rates and favorable recurrence rates in VHWG grade 3 patients. No statistically significant improvement in quality of life or reduction of pain was observed. Few patients report lasting presence of mesh sensation. Results of biosynthetic mesh after longer periods of follow-up on recurrences and remodeling will provide further valuable information to make clear recommendations.
Trial registration: Registered on clinicaltrials.gov (NCT02720042), March 25, 2016.
Background: The German Consortium for Hereditary Breast and Ovarian Cancer (GC-HBOC) has established a multigene panel (TruRisk®) for the analysis of risk genes for familial breast and ovarian cancer. Summary: An interdisciplinary team of experts from the GC-HBOC has evaluated the available data on risk modification in the presence of pathogenic mutations in these genes based on a structured literature search and through a formal consensus process. Key Messages: The goal of this work is to better assess individual disease risk and, on this basis, to derive clinical recommendations for patient counseling and care at the centers of the GC-HBOC from the initial consultation prior to genetic testing to the use of individual risk-adapted preventive/therapeutic measures.
During early G1 phase, Rb is exclusively mono-phosphorylated by cyclin D:Cdk4/6, generating 14 different isoforms with specific binding patterns to E2Fs and other cellular protein targets. While mono-phosphorylated Rb is dispensable for early G1 phase progression, interfering with cyclin D:Cdk4/6 kinase activity prevents G1 phase progression, questioning the role of cyclin D:Cdk4/6 in Rb inactivation. To dissect the molecular functions of cyclin D:Cdk4/6 during cell cycle entry, we generated a single cell reporter for Cdk2 activation, RB inactivation and cell cycle entry by CRISPR/Cas9 tagging endogenous p27 with mCherry. Through single cell tracing of Cdk4i cells, we identified a time-sensitive early G1 phase specific Cdk4/6-dependent phosphorylation gradient that regulates cell cycle entry timing and resides between serum-sensing and cyclin E:Cdk2 activation. To reveal the substrate identity of the Cdk4/6 phosphorylation gradient, we performed whole proteomic and phospho-proteomic mass spectrometry, and identified 147 proteins and 82 phospho-peptides that significantly changed due to Cdk4 inhibition in early G1 phase. In summary, we identified novel (non-Rb) cyclin D:Cdk4/6 substrates that connects early G1 phase functions with cyclin E:Cdk2 activation and Rb inactivation by hyper-phosphorylation.
Hintergrund: Das Benigne Prostatasyndrom (BPS) stellt die klinische Ausprägung der Benignen Prostatahyperplasie (BPH), eine Volkskrankheit der männlichen Bevölkerung, dar. Die Prostataarterienembolisation (PAE) ist ein junges, minimal-invasives Therapieverfahren, bei dem die Gefäße, welche die Prostata versorgen, mittels Embolisaten blockiert werden. Die Blutversorgung des embolisierten Gewebes wird dadurch unterbunden und nekrotisiert in der Folge. Dieser Infarkt lässt sich über eine Diffusionsminderung in der Magnetresonanztomographie (MRT) nachweisen. Aufgrund des technisch anspruchsvollen Verfahrens und der Komplexität der prostatischen Gefäße findet die Magnetresonanzangiographie (MRA) immer mehr Beachtung zur strahlenfreien Visualisierung des Gefäßverlaufs. Das Ziel dieser Doktorarbeit bestand darin, mögliche prädiktive Faktoren für den Therapierfolg der PAE aufzudecken und dabei die Interventionsplanung, unter Anwendung und Nichtanwendung einer MRA, zu vergleichen.
Material und Methodik: In diese retrospektive Arbeit wurden 259 Patienten, die an dem Institut für Diagnostische und Interventionelle Radiologie der Universitätsklinik Frankfurt am Main eine PAE erhielten, eingeschlossen. Das Kollektiv wurde in zwei Gruppen, abhängig vom Vorhandensein einer präinterventionellen MRA, eingeteilt. Bei 137 Patienten wurde die PAE mit einer präinterventionellen MRA Rekonstruktion ausgeführt (= Gruppe A). Bei 122 Patienten erfolgte die PAE ohne vorangehende MRA Rekonstruktion (= Gruppe B). Mit Hilfe der Fragebögen International Prostate Symptom Score (IPSS), International Index of Erectile Function (IIEF) und Quality of Life (QoL) sowie MRT-Messungen (Diffusionskoeffizient, Prostatavolumen) wurden die Daten vor und nach der PAE evaluiert. Als statistische Methoden wurden die deskriptive Datenanalyse, der gepaarte Wilcoxon-Test, der Wilcoxon-Mann-Whitney-U-Test für nicht-parametrische Variablen sowie die Korrelationsmatrix nach Spearman verwendet.
Ergebnisse: In Gruppe A konnte eine signifikant höhere mediane Prostatavolumenreduktion (rho = 0,1827, p = 0,032448) und eine Reduktion der Strahlendosis (p = 0,000000) im Vergleich zu Gruppe B erreicht werden. In Gruppe A wurde im Verlauf eine signifikant höhere Abnahme des Diffusionskoeffizienten festgestellt als in Gruppe B (p = 0,036303). Ein infarziertes Areal nach der PAE wurde zu 59,3% (n = 67) von Patienten der Gruppe A erreicht, zu 40,7% (n = 46) erreichten dies Patienten der Gruppe B. Innerhalb der Gruppe A korrelierte der initial gemessene Diffusionskoeffizient mit dem präinterventionellen IPSS (rho = 0,3259, p = 0,0213). Weiterhin korrelierten bei Einsatz einer MRA der vor der Behandlung gemessene Diffusionskoeffizient sowie der IPSS mit der Abnahme der Beschwerden (rho = 0,3138, p = 0,0285; rho = 0,6723, p = 0,0000) und der Volumenreduktion (rho = 0,3690, p = 0,0024; rho = 0,4681, p = 0,0020). Die Reduktion des Diffusionskoeffizienten korrelierte mit der Höhe der initialen Symptomatik (rho = 0,3703, p = 0,0127) und mit der Verbesserung der Beschwerden (rho = 0,3830, p = 0,0107).
Schlussfolgerung: In Zusammenschau aller Ergebnisse sind die präinterventionelle Messung des Diffusionskoeffizienten, IPSS Erhebung sowie die Prostatavolumetrie in Verbindung mit der MRA prognostisch sinnvoll. Was die vorliegende Studie leistet, sind erste Erkenntnisse auf einem bisher kaum am Menschen untersuchten Gebiet. Dieser strahlensparende, prognostische Ansatz könnte zu einer besseren Patientenselektion beitragen und weitere Ansätze für den Einsatz von Künstlicher Intelligenz schaffen. Damit könnten Strahlendosis, Kosten und Risiken minimiert werden.
Die SAFE-KiDS-Studie wurde vom 18. Juni bis zum 10. September 2020 vor dem Hintergrund der Wiedereröffnung von Kindertagesstätten nach der ersten Welle von Infektionen mit SARS-CoV-2 durchgeführt. Es sollten epidemiologische Daten von Kindern und Mitarbeitenden in insgesamt 50 hessischen Kindertagesstätten gesammelt werden, um die Bedeutung dieser Einrichtungen für das Infektionsgeschehen nach Aufnahme des eingeschränkten Regelbetriebs zu beleuchten.
Als zentrale Untersuchungsmethode wurde die Dual-Swab Methode angewandt, um herauszufinden, ob diese für longitudinale Testungen bei Kindern geeignet ist. Für die Dual-Swab Methode wurden ein Wangen- sowie ein Analschleimhautabstrich getestet, um sowohl die respiratorische als auch die gastrointestinale Ausscheidung von SARS-CoV-2 zu erfassen. Alle freiwillig an der Studie teilnehmenden Sorgeberechtigten und Mitarbeitenden wurden gebeten, bei ihren Kindern, bzw. sich selbst, wöchentlich die Abstrichentnahme durchzuführen. Ziel war es, zu quantifizieren, wie häufig es zu inapparenten Infektionen in diesem Setting kommt. Es sollte zudem untersucht werden, ob die eigenständige Abstrichentnahme bzw. Testung durch Sorgeberechtigte eine geeignete Alternative zur Probengewinnung durch medizinisches Personal während der Pandemie darstellt.
859 Kinder im Alter zwischen 3 Monaten und 8 Jahren sowie 376 Mitarbeitende nahmen an der Studie teil. Insgesamt wurden 13.273 Abstriche, davon 7.366 Wangen- und 5.907 Analschleimhautabstriche, untersucht. Es konnte lediglich bei zwei Studienteilnehmenden und in insgesamt 3 Abstrichen eine SARS-CoV- 2 Infektion nachgewiesen werden. Bei beiden Personen handelte es sich um Mitarbeiterinnen. Bei keinem der an der Studie teilnehmenden Kinder konnte eine respiratorische oder gastrointestinale Ausscheidung von SARS-CoV-2 nachgewiesen werden. In einer Befragung am Ende der Studie wurde keine weitere, nicht in der Studie erfasste Infektion mit SARS-CoV-2 angegeben.
Das Ergebnis der Studie spricht dafür, dass Kindertagesstätten in einem Zeitraum mit vergleichsweise niedriger Inzidenz von SARS-CoV-2 in Hessen während der Studiendauer kein relevantes Reservoir für SARS-CoV-2 darstellen und inapparente Infektionen bei Kindern selten vorkamen. Außerdem lässt sich daraus schließen, dass das Risiko für eine Infektion in diesen Einrichtungen unter den während der Studienzeit durchgeführten Maßnahmen bei begrenzter Aktivität in der Bevölkerung als niedrig einzustufen war.
Of the 16 non-structural proteins (Nsps) encoded by SARS CoV-2, Nsp3 is the largest and plays important roles in the viral life cycle. Being a large, multidomain, transmembrane protein, Nsp3 has been the most challenging Nsp to characterize. Encoded within Nsp3 is the papain-like protease domain (PLpro) that cleaves not only the viral polypeptide but also K48-linked polyubiquitin and the ubiquitin-like modifier, ISG15, from host cell proteins. We here compare the interactors of PLpro and Nsp3 and find a largely overlapping interactome. Intriguingly, we find that near full length Nsp3 is a more active protease compared to the minimal catalytic domain of PLpro. Using a MALDI-TOF based assay, we screen 1971 approved clinical compounds and identify five compounds that inhibit PLpro with IC50s in the low micromolar range but showed cross reactivity with other human deubiquitinases and had no significant antiviral activity in cellular SARS-CoV-2 infection assays. We therefore looked for alternative methods to block PLpro activity and engineered competitive nanobodies that bind to PLpro at the substrate binding site with nanomolar affinity thus inhibiting the enzyme. Our work highlights the importance of studying Nsp3 and provides tools and valuable insights to investigate Nsp3 biology during the viral infection cycle.
The COVID-19 pandemic and resulting measures can be regarded as a global stressor. Cross-sectional studies showed rather negative impacts on people’s mental health, while longitudinal studies considering pre-lockdown data are still scarce. The present study investigated the impact of COVID-19 related lockdown measures in a longitudinal German sample, assessed since 2017. During lockdown, 523 participants completed additional weekly online questionnaires on e.g., mental health, COVID-19-related and general stressor exposure. Predictors for and distinct trajectories of mental health outcomes were determined, using multilevel models and latent growth mixture models, respectively. Positive pandemic appraisal, social support, and adaptive cognitive emotion regulation were positively, whereas perceived stress, daily hassles, and feeling lonely negatively related to mental health outcomes in the entire sample. Three subgroups (“recovered,” 9.0%; “resilient,” 82.6%; “delayed dysfunction,” 8.4%) with different mental health responses to initial lockdown measures were identified. Subgroups differed in perceived stress and COVID-19-specific positive appraisal. Although most participants remained mentally healthy, as observed in the resilient group, we also observed inter-individual differences. Participants’ psychological state deteriorated over time in the delayed dysfunction group, putting them at risk for mental disorder development. Consequently, health services should especially identify and allocate resources to vulnerable individuals.
Background: The benefit of adjuvant therapy in synovial sarcoma (SS) treatment is under debate. Long-term follow-up data are missing.
Methods: SS patients treated in the consecutive trials CWS-81, CWS-86, CWS-91, CWS-96, CWS-2002-P, and the SoTiSaR-registry till 2013 were analyzed.
Results: Median age of 185 patients was 13.9 years (0.1–56)—with median follow-up of 7.4 years for 163 survivors. Most tumors (76%) were located in extremities. Size was < 3 cm in 58 (31%), 3–5 cm in 59 (32%), 5–10 cm in 42 (23%), and > 10 cm in 13 (7%) (13 missing). In 84 (45%) tumors, first excision was complete (R0 corresponding to IRS-I-group) and in 101 (55%) marginal (R1 corresponding to IRS-II-group). In a subsequent surgical intervention during chemotherapy, R0-status was accomplished in 23 additional IRS-II-group patients with secondary surgery. Radiotherapy was administered to 135 (73%), thereof 62 with R0-status and 67 R1-status (6 missing information). Adjuvant chemotherapy was administered to all but six patients. 5-year event-free (EFS) and overall survival (OS) was 82.9% ± 5.7 (95%CI) and 92.5% ± 3.9. Local and metastatic relapse-free survival was 91.3% ± 4.3 and 92.3% ± 4.1 at 5 years, respectively. In the multivariate analysis, tumor size and no chemotherapy were independently associated with EFS. Size and site were associated with OS. In a detailed analysis of local and metastatic events, tumor size was associated with an independent risk for developing metastases. No independent factor for suffering local recurrence could be identified.
Discussion: Omission of chemotherapy in a non-stratified way seems not justified. Size governs survival due to high linear association with risk of suffering metastatic recurrence in a granular classification.
Background: Internet- and mobile-based interventions are most efficacious in the treatment of depression when they involve some form of guidance, but providing guidance requires resources such as trained personnel, who might not always be available (eg, during lockdowns to contain the COVID-19 pandemic).
Objective: The current analysis focuses on changes in symptoms of depression in a guided sample of patients with depression who registered for an internet-based intervention, the iFightDepression tool, as well as the extent of intervention use, compared to an unguided sample. The objective is to further understand the effects of guidance and adherence on the intervention’s potential to induce symptom change.
Methods: Log data from two convenience samples in German routine care were used to assess symptom change after 6-9 weeks of intervention as well as minimal dose (finishing at least two workshops). A linear regression model with changes in Patient Health Questionnaire (PHQ-9) score as a dependent variable and guidance and minimal dose as well as their interaction as independent variables was specified.
Results: Data from 1423 people with symptoms of depression (n=940 unguided, 66.1%) were included in the current analysis. In the linear regression model predicting symptom change, a significant interaction of guidance and minimal dose revealed a specifically greater improvement for patients who received guidance and also worked with the intervention content (β=–1.75, t=–2.37, P=.02), while there was little difference in symptom change due to guidance in the group that did not use the intervention. In this model, the main effect of guidance was only marginally significant (β=–.53, t=–1.78, P=.08).
Conclusions: Guidance in internet-based interventions for depression is not only an important factor to facilitate adherence, but also seems to further improve results for patients adhering to the intervention compared to those who do the same but without guidance.
Background: Secukinumab [an interleukin (IL)‐17A inhibitor] has demonstrated significantly higher efficacy vs. etanercept (a tumour necrosis factor inhibitor) and ustekinumab (an IL‐12/23 inhibitor) in patients with moderate‐to‐severe plaque psoriasis.
Objectives: To report 52‐week results from a prespecified analysis of patients with active psoriatic arthritis (PsA) having concomitant moderate‐to‐severe plaque psoriasis from the head‐to‐head EXCEED monotherapy study comparing secukinumab with adalimumab.
Methods: Patients were randomized to receive secukinumab 300 mg via subcutaneous injection at baseline, week 1–4, and then every 4 weeks until week 48 or adalimumab 40 mg via subcutaneous injection every 2 weeks from baseline until week 50. Assessments in patients with concomitant moderate‐to‐severe psoriasis, defined as having affected body surface area > 10% or Psoriasis Area and Severity Index (PASI) ≥ 10 at baseline, included musculoskeletal, skin and quality‐of‐life outcomes. Missing data were handled using multiple imputation.
Results: Of the 853 patients [secukinumab (N = 426), adalimumab (N = 427)], 211 (24·7%) had concomitant moderate‐to‐severe psoriasis [secukinumab (N = 110, 25·8%), adalimumab (N = 101, 23·7%)]. Up to week 50, 5·5% of patients discontinued secukinumab vs.17·8% in the adalimumab group. The proportion of patients who achieved American College of Rheumatology (ACR) 20 response was 76·4% with secukinumab vs. 68·3% with adalimumab (P = 0·175), PASI 100 response was 39·1% vs. 23·8% (P = 0·013), and simultaneous improvement in ACR 50 and PASI 100 response at week 52 was 28·2% vs. 17·7%, respectively (P = 0·06). Secukinumab demonstrated consistently higher responses vs. adalimumab across skin endpoints.
Conclusions: This prespecified analysis in PsA patients with concomitant moderate‐to‐severe plaque psoriasis in the EXCEED study provides further evidence that IL‐17 inhibitors offer a comprehensive biological treatment to manage the concomitant features of psoriasis and PsA.
We report here that RUFY4, a newly characterized member of the ‘RUN and FYVE domain-containing’ family of proteins previously associated with autophagy enhancement, is highly expressed in alveolar macrophages (AM). We show that RUFY4 interacts with mitochondria upon stimulation by microbial-associated molecular patterns of AM and dendritic cells. RUFY4 interaction with mitochondria and other organelles is dependent on a previously uncharacterized OmpH domain located immediately upstream of its C-terminal FYVE domain. Further, we demonstrate that rufy4 messenger RNA can be translated from an alternative translation initiation codon, giving rise to a N-terminally truncated form of the molecule lacking most of its RUN domain and with enhanced potential for its interaction with mitochondria. Our observations point towards a role of RUFY4 in selective mitochondria clearance in activated phagocytes.
Background: Using data from the COHERE collaboration, we investigated whether primary prophylaxis for pneumocystis pneumonia (PcP) might be withheld in all patients on antiretroviral therapy (ART) with suppressed plasma human immunodeficiency virus (HIV) RNA (≤400 copies/mL), irrespective of CD4 count.
Methods: We implemented an established causal inference approach whereby observational data are used to emulate a randomized trial. Patients taking PcP prophylaxis were eligible for the emulated trial if their CD4 count was ≤200 cells/µL in line with existing recommendations. We compared the following 2 strategies for stopping prophylaxis: (1) when CD4 count was >200 cells/µL for >3 months or (2) when the patient was virologically suppressed (2 consecutive HIV RNA ≤400 copies/mL). Patients were artificially censored if they did not comply with these stopping rules. We estimated the risk of primary PcP in patients on ART, using the hazard ratio (HR) to compare the stopping strategies by fitting a pooled logistic model, including inverse probability weights to adjust for the selection bias introduced by the artificial censoring.
Results: A total of 4813 patients (10 324 person-years) complied with eligibility conditions for the emulated trial. With primary PcP diagnosis as an endpoint, the adjusted HR (aHR) indicated a slightly lower, but not statistically significant, different risk for the strategy based on viral suppression alone compared with the existing guidelines (aHR, .8; 95% confidence interval, .6–1.1; P = .2).
Conclusions: This study suggests that primary PcP prophylaxis might be safely withheld in confirmed virologically suppressed patients on ART, regardless of their CD4 count.
We report a case of a 2-day-old neonate with bilious vomiting and abdominal distension. A small bowel obstruction with ileal perforation due to a misplaced clamping of the umbilical cord was apparent before laparotomy. This complication was a sequala after clamping the cord too close to the abdominal wall in a case where there was a hernia into the cord with intestinal content. A herniation of abdominal contents due to an omphalocele minor or a hernia must be taken into consideration during the inspection of the umbilical cord before clamping.
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.
The antibody-drug conjugate polatuzumab vedotin (pola) has recently been approved in combination with bendamustine and rituximab (pola-BR) for patients with refractory or relapsed (r/r) large B-cell lymphoma (LBCL). To investigate the efficacy of pola-BR in a real-world setting, we retrospectively analyzed 105 patients with LBCL who were treated in 26 German centers under the national compassionate use program. Fifty-four patients received pola as a salvage treatment and 51 patients were treated with pola with the intention to bridge to chimeric antigen receptor (CAR) T-cell therapy (n = 41) or allogeneic hematopoietic cell transplantation (n = 10). Notably, patients in the salvage and bridging cohort had received a median of 3 prior treatment lines. In the salvage cohort, the best overall response rate was 48.1%. The 6-month progression-free survival and overall survival (OS) was 27.7% and 49.6%, respectively. In the bridging cohort, 51.2% of patients could be successfully bridged with pola to the intended CAR T-cell therapy. The combination of pola bridging and successful CAR T-cell therapy resulted in a 6-month OS of 77.9% calculated from pola initiation. Pola vedotin-rituximab without a chemotherapy backbone demonstrated encouraging overall response rates up to 40%, highlighting both an appropriate alternative for patients unsuitable for chemotherapy and a new treatment option for bridging before leukapheresis in patients intended for CAR T-cell therapy. Furthermore, 7 of 12 patients with previous failure of CAR T-cell therapy responded to a pola-containing regimen. These findings suggest that pola may serve as effective salvage and bridging treatment of r/r LBCL patients.
Background:
Specialised palliative home-care supports patients with life-limiting diseases in their familiar surroundings. The number of palliative care teams and patients being cared for is increasing worldwide. To assess and improve quality, it is needed to understand, how specialised palliative home-care can be provided successfully. For this purpose we examined the views of all involved stakeholders.
Aim:
To identify the issues that patients, their relatives and involved health professionals view as important in ensuring the success of specialised palliative home-care.
Design:
We used a qualitative design based on participant observations, interviews and focus groups following the principles of a Grounded Theory approach.
Setting/participants:
All specialised palliative home-care teams (n = 22) caring for adults in Hesse, Germany, participated. We conducted participant observations (n = 5), and interviewed patients (n = 14), relatives (n = 14) and health professionals working in or collaborating with specialised palliative home-care (n = 30). We also conducted focus groups (n = 4) with health professionals including a member check.
Results:
Successful specialised palliative home-care needs to treat complex symptoms, and provide comprehensive care including organisation of care, involving relatives and addressing issues of death and dying. Sense of security for patients and relatives is key to enable care at home. Care delivery preferences include a focus on the quality of relationships, respect for individuality and the facilitation of self-determination.
Conclusions:
Consideration of the identified key issues can help to ensure successful specialised palliative home-care. Knowledge of these should also be considered when researching and assessing quality of care.
Trial registration:
German Clinical Trials Register DRKS-ID: DRKS00012421; http://www.germanctr.de.
The discovery of clustered regularly interspaced short palindromic repeats and their associated proteins (Cas) has revolutionized the field of genome and epigenome editing. A number of new methods have been developed to precisely control the function and activity of Cas proteins, including fusion proteins and small-molecule modulators. Proteolysis-targeting chimeras (PROTACs) represent a new concept using the ubiquitin-proteasome system to degrade a protein of interest, highlighting the significance of chemically induced protein-E3 ligase interaction in drug discovery. Here, we engineered Cas proteins (Cas9, dCas9, Cas12, and Cas13) by inserting a Phe-Cys-Pro-Phe (FCPF) amino acid sequence (known as the π-clamp system) and demonstrate that the modified CasFCPF proteins can be (1) labeled in live cells by perfluoroaromatics carrying the fluorescein or (2) degraded by a perfluoroaromatics-functionalized PROTAC (PROTAC-FCPF). A proteome-wide analysis of PROTAC-FCPF-mediated Cas9FCPF protein degradation revealed a high target specificity, suggesting a wide range of applications of perfluoroaromatics-induced proximity in the regulation of stability, activity, and functionality of any FCPF-tagging protein.
Objectives: An increasing number of treatment-determining biomarkers has been identified in non-small cell lung cancer (NSCLC) and molecular testing is recommended to enable optimal individualized treatment. However, data on implementation of these recommendations in the “real-world” setting are scarce. This study presents comprehensive details on the frequency, methodology and results of biomarker testing of advanced NSCLC in Germany.
Patients and methods: This analysis included 3,717 patients with advanced NSCLC (2,921 non-squamous; 796 squamous), recruited into the CRISP registry at start of systemic therapy by 150 German sites between December 2015 and June 2019. Evaluated were the molecular biomarkers EGFR, ALK, ROS1, BRAF, KRAS, MET, TP53, RET, HER2, as well as expression of PD-L1.
Results: In total, 90.5 % of the patients were tested for biomarkers. Testing rates were 92.2 % (non-squamous), 70.7 % (squamous) and increased from 83.2 % in 2015/16 to 94.2% in 2019. Overall testing rates for EGFR, ALK, ROS1, and BRAF were 72.5 %, 74.5 %, 66.1 %, and 53.0 %, respectively (non-squamous). Testing rates for PD-L1 expression were 64.5 % (non-squamous), and 58.5 % (squamous). The most common testing methods were immunohistochemistry (68.5 % non-squamous, 58.3 % squamous), and next-generation sequencing (38.7 % non-squamous, 14.4 % squamous). Reasons for not testing were insufficient tumor material or lack of guideline recommendations (squamous). No alteration was found in 37.8 % (non-squamous), and 57.9 % (squamous), respectively. Most common alterations in non-squamous tumors (all patients/all patients tested for the respective biomarker): KRAS (17.3 %/39.2 %), TP53 (14.1 %/51.4 %), and EGFR (11.0 %/15.1 %); in squamous tumors: TP53 (7.0 %/69.1 %), MET (1.5 %/11.1 %), and EGFR (1.1 %/4.4 %). Median PFS (non-squamous) was 8.7 months (95 % CI 7.4–10.4) with druggable EGFR mutation, and 8.0 months (95 % CI 3.9–9.2) with druggable ALK alterations.
Conclusion: Testing rates in Germany are high nationwide and acceptable in international comparison, but still leave out a significant portion of patients, who could potentially benefit. Thus, specific measures are needed to increase implementation.
Human lymph nodes play a central part of immune defense against infection agents and tumor cells. Lymphoid follicles are compartments of the lymph node which are spherical, mainly filled with B cells. B cells are cellular components of the adaptive immune systems. In the course of a specific immune response, lymphoid follicles pass different morphological differentiation stages. The morphology and the spatial distribution of lymphoid follicles can be sometimes associated to a particular causative agent and development stage of a disease. We report our new approach for the automatic detection of follicular regions in histological whole slide images of tissue sections immuno-stained with actin. The method is divided in two phases: (1) shock filter-based detection of transition points and (2) segmentation of follicular regions. Follicular regions in 10 whole slide images were manually annotated by visual inspection, and sample surveys were conducted by an expert pathologist. The results of our method were validated by comparing with the manual annotation. On average, we could achieve a Zijbendos similarity index of 0.71, with a standard deviation of 0.07.
Consciousness transiently fades away during deep sleep, more stably under anesthesia, and sometimes permanently due to brain injury. The development of an index to quantify the level of consciousness across these different states is regarded as a key problem both in basic and clinical neuroscience. We argue that this problem is ill-defined since such an index would not exhaust all the relevant information about a given state of consciousness. While the level of consciousness can be taken to describe the actual brain state, a complete characterization should also include its potential behavior against external perturbations. We developed and analyzed whole-brain computational models to show that the stability of conscious states provides information complementary to their similarity to conscious wakefulness. Our work leads to a novel methodological framework to sort out different brain states by their stability and reversibility, and illustrates its usefulness to dissociate between physiological (sleep), pathological (brain-injured patients), and pharmacologically-induced (anesthesia) loss of consciousness.
Mental imagery provides an essential simulation tool for remembering the past and planning the future, with its strength affecting both cognition and mental health. Research suggests that neural activity spanning prefrontal, parietal, temporal, and visual areas supports the generation of mental images. Exactly how this network controls the strength of visual imagery remains unknown. Here, brain imaging and transcranial magnetic phosphene data show that lower resting activity and excitability levels in early visual cortex (V1-V3) predict stronger sensory imagery. Further, electrically decreasing visual cortex excitability using tDCS increases imagery strength, demonstrating a causative role of visual cortex excitability in controlling visual imagery. Together, these data suggest a neurophysiological mechanism of cortical excitability involved in controlling the strength of mental images.
Mental imagery provides an essential simulation tool for remembering the past and planning the future, with its strength affecting both cognition and mental health. Research suggests that neural activity spanning prefrontal, parietal, temporal, and visual areas supports the generation of mental images. Exactly how this network controls the strength of visual imagery remains unknown. Here, brain imaging and transcranial magnetic phosphene data show that lower resting activity and excitability levels in early visual cortex (V1-V3) predict stronger sensory imagery. Electrically decreasing visual cortex excitability using tDCS increases imagery strength, demonstrating a causative role of visual cortex excitability in controlling visual imagery. These data suggest a neurophysiological mechanism of cortical excitability involved in controlling the strength of mental images.
Purpose: Molecular diagnostics including next generation gene sequencing are increasingly used to determine options for individualized therapies in brain tumor patients. We aimed to evaluate the decision-making process of molecular targeted therapies and analyze data on tolerability as well as signals for efficacy.
Methods: Via retrospective analysis, we identified primary brain tumor patients who were treated off-label with a targeted therapy at the University Hospital Frankfurt, Goethe University. We analyzed which types of molecular alterations were utilized to guide molecular off-label therapies and the diagnostic procedures for their assessment during the period from 2008 to 2021. Data on tolerability and outcomes were collected.
Results: 413 off-label therapies were identified with an increasing annual number for the interval after 2016. 37 interventions (9%) were targeted therapies based on molecular markers. Glioma and meningioma were the most frequent entities treated with molecular matched targeted therapies. Rare entities comprised e.g. medulloblastoma and papillary craniopharyngeoma. Molecular targeted approaches included checkpoint inhibitors, inhibitors of mTOR, FGFR, ALK, MET, ROS1, PIK3CA, CDK4/6, BRAF/MEK and PARP. Responses in the first follow-up MRI were partial response (13.5%), stable disease (29.7%) and progressive disease (46.0%). There were no new safety signals. Adverse events with fatal outcome (CTCAE grade 5) were not observed. Only, two patients discontinued treatment due to side effects. Median progression-free and overall survival were 9.1/18 months in patients with at least stable disease, and 1.8/3.6 months in those with progressive disease at the first follow-up MRI.
Conclusion: A broad range of actionable alterations was targeted with available molecular therapeutics.
However, efficacy was largely observed in entities with paradigmatic oncogenic drivers, in particular with BRAF mutations. Further research on biomarker-informed molecular matched therapies is urgently necessary.
Das akut-auf-chronische Leberversagen (ACLF) entsteht durch eine akute Dekompensation einer vorbestehenden Leberzirrhose mit begleitendem Multiorganversagen und ist durch eine sehr hohe Kurzzeitmortalität gekennzeichnet. Die Kriterien der European Association for the Study of Chronic Liver Failure (EASL-CLIF) definieren in diesem Zusammenhang ein Lungenversagen als Abfall des Horovitz-Quotienten unter 200mmHg oder als Abfall des Quotienten aus SpO2/FiO2 unter 214. Während Lungenfunktionsstörungen als unabhängiger Risikofaktor für Mortalität bei Patienten mit Leberzirrhose belegt sind, wurde die Bedeutung von mechanischer Beatmung und Lungenversagen bisher nicht isoliert untersucht. Ziel der Studie ist die Rolle von mechanischer Beatmung und Lungenversagen im ACLF zu analysieren und eine mögliche Unterinterpretation in den etablierten prädiktiven Modellen zu evaluieren.
Es wurden Daten aus 775 Hospitalisationen mit intensivmedizinischer Behandlung am Universitätsklinikum Frankfurt von insgesamt 498 Patienten mit Leberzirrhose im Zeitraum März 2015 bis Juli 2019 retrospektiv erfasst und ausgewertet. ACLF und Organversagen wurden gemäß EASL-CLIF Kriterien definiert. Es erfolgte die statistische Analyse verschiedener Kohorten, wobei ACLF-Patienten mittels Propensity Score hinsichtlich CLIF-C ACLF Score und Geschlecht gematcht und anhand der pulmonalen Beeinträchtigung in eine dreiarmige Testkohorte bestehend aus 49 Patienten mit Lungenversagen, 49 Patienten mit Schutzintubation und 49 Patienten ohne pulmonale Beeinträchtigung aufgeteilt wurden.
216 Patienten zeigten ein ACLF bei Aufnahme, 121 wurden mechanisch beatmet und 68 hatten ein Lungenversagen. In der gematchten Kohorte (n=147) konnten Lungenversagen (HR 3,0) und mechanische Beatmung (HR 1,7) als unabhängige Risikofaktoren für eine hohe 28-Tage-Mortalität identifiziert werden. Der CLIF-C ACLF Score konnte als bestes Modell für die Vorhersage der Kurzzeitmortalität bestätigt werden (AUROC 0,81), zeigte allerdingt deutliche Schwächen in der Subkohorte der Patienten mit Lungenversagen (AUROC 0,49) und mechanischer Beatmung (AUROC 0,68). Eine Kalibrierung des CLIF-C ACLF Scores für diese beiden Risikofaktoren liefert auch in der Gesamtkohorte aller zirrhotischer Patienten eine signifikant verbesserte prädiktive Performance (AUROC 0,87; p=0,001).
Mechanische Beatmung und Lungenversagen sind im Rahmen eines ACLF mit einer erhöhten Kurzzeitmortalität assoziiert und nur ungenügend in den etablierten Prädiktionsmodellen abgebildet. Die Kalibrierung des CLIF-C ACLF Scores für diese Risikofaktoren führt zu einer verbesserten Vorhersagegenauigkeit.
The new variant of concern (VOC) of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), Omicron (B.1.1.529), is genetically very different from other VOCs. We compared Omicron with the preceding VOC Delta (B.1.617.2) and the wildtype strain (B.1) with respect to their interactions with the antiviral type I interferon (IFN-alpha/beta) response in infected cells. Our data indicate that Omicron has gained an elevated capability to suppress IFN-beta induction upon infection and to better withstand the antiviral state imposed by exogenously added IFN-alpha.
The SARS-CoV-2 Omicron variant is currently causing a large number of infections in many countries. A number of antiviral agents are approved or in clinical testing for the treatment of COVID-19. Despite the high number of mutations in the Omicron variant, we here show that Omicron isolates display similar sensitivity to eight of the most important anti-SARS-CoV-2 drugs and drug candidates (including remdesivir, molnupiravir, and PF-07321332, the active compound in paxlovid), which is of timely relevance for the treatment of the increasing number of Omicron patients. Most importantly, we also found that the Omicron variant displays a reduced capability of antagonising the host cell interferon response. This provides a potential mechanistic explanation for the clinically observed reduced pathogenicity of Omicron variant viruses compared to Delta variant viruses.
Recently, we have shown that SARS-CoV-2 Omicron virus isolates are less effective at inhibiting the host cell interferon response than Delta viruses. Here, we present further evidence that reduced interferon-antagonising activity explains at least in part why Omicron variant infections are inherently less severe than infections with other SARS-CoV-2 variants. Most importantly, we here also show that Omicron variant viruses display enhanced sensitivity to interferon treatment, which makes interferons promising therapy candidates for Omicron patients, in particular in combination with other antiviral agents.
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.
Multiplex families with a high prevalence of a psychiatric disorder are often examined to identify rare genetic variants with large effect sizes. In the present study, we analysed whether the risk for bipolar disorder (BD) in BD multiplex families is influenced by common genetic variants. Furthermore, we investigated whether this risk is conferred mainly by BD-specific risk variants or by variants also associated with the susceptibility to schizophrenia or major depression. In total, 395 individuals from 33 Andalusian BD multiplex families as well as 438 subjects from an independent, sporadic BD case-control cohort were analysed. Polygenic risk scores (PRS) for BD, schizophrenia, and major depression were calculated and compared between the cohorts. Both the familial BD cases and unaffected family members had significantly higher PRS for all three psychiatric disorders than the independent controls, suggesting a high baseline risk for several psychiatric disorders in the families. Moreover, familial BD cases showed significantly higher BD PRS than unaffected family members and sporadic BD cases. A plausible hypothesis is that, in multiplex families with a general increase in risk for psychiatric disease, BD development is attributable to a high burden of common variants that confer a specific risk for BD. The present analyses, therefore, demonstrated that common genetic risk variants for psychiatric disorders are likely to contribute to the high incidence of affective psychiatric disorders in the multiplex families. The PRS explained only part of the observed phenotypic variance and rare variants might have also contributed to disease development.
Investigators in the cognitive neurosciences have turned to Big Data to address persistent replication and reliability issues by increasing sample sizes, statistical power, and representativeness of data. While there is tremendous potential to advance science through open data sharing, these efforts unveil a host of new questions about how to integrate data arising from distinct sources and instruments. We focus on the most frequently assessed area of cognition - memory testing - and demonstrate a process for reliable data harmonization across three common measures. We aggregated raw data from 53 studies from around the world which measured at least one of three distinct verbal learning tasks, totaling N = 10,505 healthy and brain-injured individuals. A mega analysis was conducted using empirical bayes harmonization to isolate and remove site effects, followed by linear models which adjusted for common covariates. After corrections, a continuous item response theory (IRT) model estimated each individual subject’s latent verbal learning ability while accounting for item difficulties. Harmonization significantly reduced inter-site variance by 37% while preserving covariate effects. The effects of age, sex, and education on scores were found to be highly consistent across memory tests. IRT methods for equating scores across AVLTs agreed with held-out data of dually-administered tests, and these tools are made available for free online. This work demonstrates that large-scale data sharing and harmonization initiatives can offer opportunities to address reproducibility and integration challenges across the behavioral sciences.
Mapping cortical brain asymmetry in 17,141 healthy individuals worldwide via the ENIGMA Consortium
(2017)
Bipolar disorder (BD) is a genetically complex mental illness characterized by severe oscillations of mood and behavior. Genome-wide association studies (GWAS) have identified several risk loci that together account for a small portion of the heritability. To identify additional risk loci, we performed a two-stage meta-analysis of >9 million genetic variants in 9,784 bipolar disorder patients and 30,471 controls, the largest GWAS of BD to date. In this study, to increase power we used ~2,000 lithium-treated cases with a long-term diagnosis of BD from the Consortium on Lithium Genetics, excess controls, and analytic methods optimized for markers on the Xchromosome. In addition to four known loci, results revealed genome-wide significant associations at two novel loci: an intergenic region on 9p21.3 (rs12553324, p = 5.87×10-9; odds ratio = 1.12) and markers within ERBB2 (rs2517959, p = 4.53×10-9; odds ratio = 1.13). No significant X-chromosome associations were detected and X-linked markers explained very little BD heritability. The results add to a growing list of common autosomal variants involved in BD and illustrate the power of comparing well-characterized cases to an excess of controls in GWAS.
Der Zusammenhang zwischen kognitiver Emotionsregulation, positivem Aufmerksamkeitsbias und Resilienz
(2022)
Das Verständnis von Faktoren, die die Widerstandsfähigkeit gegen Stress fördern, ist entscheidend für die Entwicklung von Stresspräventionsprogrammen und für die Verbesserung der Behandlung stressbedingter Störungen. Zum einen war es Ziel der vorliegenden Forschungsarbeit, den Einfluss der kognitiven Emotionsregulation (ER) auf die psychische Gesundheit zu untersuchen und bereits vorhandene Ergebnisse zum Einfluss der Emotionsregulation auf die Resilienz zu replizieren. Es wird zunehmend anerkannt, dass die meisten psychiatrischen Erkrankungen mit Emotionsdysregulation einhergehen und dass klinische Interventionen davon profitieren, wenn sie auf einem empirischen Verständnis der Emotionsprozesse beruhen.
Der Hauptfokus lag zudem darauf, zu untersuchen, ob es einen Zusammenhang zwischen Resilienz und einem Aufmerksamkeitsbias auf positive Informationen, einen Positivitätsbias, gibt.
In der vorliegenden Studie wurde eine Stichprobe psychisch gesunder Teilnehmer (n=229) im Alter von 18 bis 55 Jahren herangezogen, denen Bilder aus dem „International Affective Picture System“ präsentiert wurden. Dabei bekamen sie die Anweisung, negative Emotionen zu Fotos durch kognitives Umbewerten oder Distanzieren herunterzuregulieren. Die Reaktionszeiten sowie die Erregungsbewertungen wurden für die Bedingungen Neubewertung, Distanzieren, negatives passives Betrachten sowie neutrales passives Betrachten erhoben. Zudem wurde die Aufmerksamkeitsverzerrung gegenüber positiven und negativen Reizen mithilfe einer Visual Dot-Probe Aufgabe untersucht. Gemessen wurden die Reaktionszeiten der Studienteilnehmer bei Reaktionen auf einen Stimulus, der auf die Präsentation emotionaler Gesichter folgt, im Vergleich zu Reaktionen auf einen Stimulus, der an die Stelle von neutralen Gesichtern rückt. Hieraus wurden Aufmerksamkeitsverzerrungen abgeleitet.
Die anschließende Datenanalyse und statistische Auswertung konnten zeigen, dass die Neubewertung im Vergleich zum passiven Betrachten der negativen Bilder eine längere Reaktionszeit aufweist, was darauf hinweist, dass die kognitive Emotionsregulation möglicherweise anstrengendere kognitive Kontrollprozesse aktiviert. Hinsichtlich des Zusammenhangs mit der Resilienz konnte eine signifikante positive Korrelation der Reaktionszeitdifferenzen der Emotionsregulationsstrategien Distanzieren und Neubewerten mit dem Resilienz-Score beobachtet werden.
Bei den Erregungsbewertungen der Emotionsregulation zeigte sich weder ein signifikanter Effekt der Bedingung noch ein Zusammenhang mit dem Resilienz-Score.
Die Ergebnisse der Visual Dot-Probe zeigten, dass es keine Unterschiede in den Reaktionszeiten nach der Präsentation des neutralen sowie des emotionalen Stimulus gab. Auch zeigten sich keine Zusammenhänge mit der Resilienz.
Der erwartete Zusammenhang zwischen Resilienz und einem Aufmerksamkeitsbias auf positive Informationen konnte in den Ergebnissen nicht gefunden werden. In den vorliegenden Daten zeigte sich hingegen eine signifikante negative Korrelation der Fähigkeit der kognitiven Neubewertung mit der Höhe des negativen Aufmerksamkeits Bias-Scores.
Somit liefert die vorliegende Arbeit einen Hinweis darauf, dass Personen mit einem hohen Maß an Emotionsregulationskapazitäten eine höhere Aufmerksamkeitslenkung weg von emotional negativen Stimuli aufweisen.
Bezüglich der Anwendung auf klinische Stichproben besteht noch Raum zu
analysieren, ob es sich um ein stabiles Phänomen handelt, das auf diese übertragen werden kann.
Der Nutzen von DJ-Kathetern ist unverzichtbar für die moderne Urologie. Sie sind essenziell, um bei einer Vielzahl von Erkrankungen einen adäquaten Harnabfluss und dementsprechend eine gute Nierenfunktion gewährleisten zu können. Dabei können sie für eine temporäre oder dauerhafte Schienung genutzt werden. Als einliegende Fremdkörper können sie, insbesondere bei langfristiger Nutzung, leicht durch Bakterien und Pilze kolonisiert werden und beherbergen somit ein erhöhtes Risiko für Harnwegsinfekte.
Das Hauptziel dieser Arbeit ist folglich, durch das Auffinden von protektiven oder prädisponierenden Faktoren für die Entwicklung von fieberhaften Harnwegsinfekten in der Zukunft Mortalität, Resistenzbildung und Kosten sowohl bei DJ-Katheter-Dauerversorgung als auch generell senken zu können. Zusätzlich soll untersucht werden, ob verschiedene Antibiotika-Regime einen Einfluss auf die Entwicklung postoperativer, fieberhafter Harnwegsinfekte haben.
Um dies feststellen zu können, wurden in dieser Studie 100 Patientinnen und Patienten eingeschlossen, die von 2013 bis 2018 in der Klinik für Urologie des Universitätsklinikums Frankfurt zum DJ-Wechsel bei DJ-Katheter-Dauerversorgung vorstellig wurden. Anschließend wurden verschiedene Faktoren untersucht, die das Risiko für das Auftreten von fieberhaften Harnwegsinfekten oder die Entwicklung von Resistenzen in Krankheitserregern erhöhen oder reduzieren könnten.
Hierzu wurden insgesamt 950 DJ-Katheter-assoziierte Eingriffe (Einlage, Wechsel, Entfernung) analysiert. Der individuelle Beobachtungszeitraum betrug durchschnittlich 2,9 Jahre mit durchschnittlich 7 DJ-Katheter-Wechsel.
Gegenüber der Normalbevölkerung wies die Studienpopulation, am ehesten durch die einliegenden DJ-Katheter, eine deutlich erhöhte Prävalenz von Harnwegsinfekten auf (18,53% vs. 2,5%). Darüber hinaus konnte gezeigt werden, dass ein höheres Patientenalter mit einem gering erhöhten Risiko für die Ausbildung von resistenten Keimen im Urin korreliert (p=0,0121; OR 1,0395; KI 1,0096-1,0731 (univariate Analyse), p=0,0030; OR 1,0618 KI 1,0226-1,1077 (multivariate Analyse)). Dies korrelierte jedoch nicht mit einem erhöhten Risiko für fieberhafte Harnwegsinfekte. Darüber hinaus konnte festgestellt werden, dass die operative Manipulation unter empirischer oder testgerechter, antibiotischer Therapie nicht mit einem hohen Risiko für die Entstehung fieberhafter Harnwegsinfekte einhergeht. In den analysierten Daten fanden sich insgesamt zu wenige fieberhafte Infekte (n=72; 7,58%), um das Ziel begünstigender oder protektiver Faktoren für die Entstehung von fieberhaften Harnwegsinfekten adäquat zu untersuchen. Aus dem gleichen Grund konnten aus den Daten auch keine Hinweise für das optimale Antibiotika-Regime abgeleitet werden. In fast 70% der untersuchten Fälle wurde eine periinterventionelle single-shot Antibiose angewendet, weswegen diese als Infektionsprophylaxe einen adäquaten Schutz darzustellen scheint.
Generell kann davon ausgegangen werden, dass die DJ-Katheter-Dauerversorgung, trotz der möglichen mikrobiellen Besiedlung mit eventuellen Komplikationen wie Bakteriurie oder systemischen Infektionen, ein sicheres Verfahren ist. Manipulationen oder operativer Wechsel der DJ-Katheter stellen, trotz Präsenz der Keime, keine riskanten Manöver dar, sofern diese adäquat und unter entsprechender, antibiotischer Therapie durchgeführt werden.
Weitere, noch größere und insbesondere prospektive, randomisierte Studien sind zu empfehlen und könnten die Ergebnisse weiter bestätigen und erweitern, vor allem in Bezug auf die Überlegenheit verschiedener antibiotischer Regime in der Vermeidung einer Resistenzbildung.