610 Medizin und Gesundheit
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Mitochondrial RNA granules (MRGs) are membraneless, highly specialized compartments that play an essential role in the post-transcriptional regulation of mitochondrial gene expression. This regulation is crucial for maintaining energy production, controlling metabolic functions and ensuring homeostasis in cells. Dysregulation of mitochondrial genes has been linked to various human diseases, including neurodegenerative and metabolic disorders as well as certain types of cancer.
MRGs are composed of different RNA species, including mitochondrial precursor RNA (pre-RNA), mature tRNAs, rRNAs and mRNAs complexed with multiple proteins involved in RNA processing and mitoribosome assembly. However, despite the significance of MRGs, their protein composition, structural organization, stability and dynamics during stress conditions remain elusive. In the study reported here, I adopted a three-step approach to address the aforementioned fundamental issues.
First and foremost, I identified the protein composition of MRGs and unveiled their architectural complexity. To characterize the MRG proteome, I applied the cutting-edge TurboID-based proximity labeling approach combined with quantitative mass spectrometry. Proximity labeling was conducted on 20 distinct MRG-associated human proteins, resulting in the identification of more than 1,700 protein-protein interactions. This expansive dataset enabled me to create a comprehensive network, providing valuable insights into both the (sub)architecture as well as the core structure of MRGs in-depth.
Secondly, I investigated the spatio-temporal dynamics of MRGs under various mitochondrial stress conditions. To monitor the morphological alterations and compositional changes of MRGs, I utilized time-resolved confocal fluorescence microscopy and proteomics, respectively. In this analysis, I applied IMT1, the first specific inhibitor that selectively targets mitochondrial transcription. Using this methodology, I pinpointed precise conditions that triggered MRGs’ disassembly during stress, followed by their reassembly when nascent RNA production was restored. The results of this examination elucidate that MRGs are highly dynamic and stress adaptive structures, capable of rapid dissolution and reassembly, a process closely connected to mitochondrial transcription.
Thirdly, I aimed to explore the impact of RNA turnover on MRGs’ integrity during stress, employing confocal fluorescence microscopy and quantitative real-time PCR. I observed that depletion of MRG proteins associated with RNA degradation counteracts MRGs’ disassembly under stress conditions, a phenomenon attributed to the accumulation of double-stranded RNA (dsRNA). These results emphasize the critical role of pre-RNA turnover in maintaining MRG integrity and reveal that MRGs can be stabilized by dsRNA.
Taken together, the comprehensive investigation reported in this thesis has substantially broadened and deepened our understanding of MRGs’ complexity. By identifying their molecular structure and dynamics, I have gained significant insights into the fundamental characteristics and biological functions of MRGs in cellular processes. This knowledge contributes to the identification of disease-related pathways linked to mitochondrial gene expression and may inspire future studies to develop novel therapeutic approaches.
The sympathetic nervous system (SNS) is a major regulatory mediator connecting the brain and the immune system that influences accordingly inflammatory processes within the entire body. In the periphery, the SNS exerts its effects mainly via its neurotransmitters norepinephrine (NE) and epinephrine (E), which are released by peripheral nerve endings in lymphatic organs and other tissues. Depending on their concentration, NE and E bind to specific α- and β-adrenergic receptor subtypes and can cause both pro- and anti-inflammatory cellular responses. The co-transmitter neuropeptide Y, adenosine triphosphate, or its metabolite adenosine are also mediators of the SNS. Local pro-inflammatory processes due to injury or pathogens lead to an activation of the SNS, which in turn induces several immunoregulatory mechanisms with either pro- or anti-inflammatory effects depending on neurotransmitter concentration or pathological context. In chronic inflammatory diseases, the activity of the SNS is persistently elevated and can trigger detrimental pathological processes. Recently, the sympathetic contribution to mild chronic inflammatory diseases like osteoarthritis (OA) has attracted growing interest. OA is a whole-joint disease and is characterized by mild chronic inflammation in the joint. In this narrative article, we summarize the underlying mechanisms behind the sympathetic influence on inflammation during OA pathogenesis. In addition, OA comorbidities also accompanied by mild chronic inflammation, such as hypertension, obesity, diabetes, and depression, will be reviewed. Finally, the potential of SNS-based therapeutic options for the treatment of OA will be discussed.
Die radikale Prostatektomie (RP) stellt neben der Radiatio der Prostata den Goldstandard der Lokaltherapie des lokalisierten Prostatakarzinoms (PCa) dar. Neben der Erzielung einer postoperativen Tumorfreiheit (onkologisches Ergebnis), spielen die postoperativen, funktionellen Ergebnisse (z.B. Erektionsfähigkeit, Urin-Kontinenz) nach RP für die Patienten eine zentrale Rolle. Hierbei ist vor allem die (Wieder-) Erlangung der postoperativen Kontinenz hervorzuheben, da das Ausbleiben mit einem substantiellem Verlust der Lebensqualität einhergeht und eine deutliche Einschränkung im Alltag darstellt. Verschiedene Tumor- und Patientencharakteristika (pathologisches Tumorstadium, Body Mass Index [BMI], Alter, Prostatavolumen) wurden in vorangegangenen Publikationen als Faktoren identifiziert, die Einflüsse auf die Wiedererlangung der Kontinenz nach RP haben. Interessanterweise jedoch, wurde der Einfluss von Diabetes Mellitus auf die Kontinenz-Rate zum jetzigen Stand nur unzureichend und teils mit widersprüchlichen Ergebnissen untersucht. In Anbetracht der vorbekannten protrahierten Wundheilungsverläufe sowie Mikrozirkulationsstörungen und Neuropathie bei Diabetes mellitus Patienten, hat die jetzige Studie deshalb untersucht, ob das Vorliegen von Diabetes Mellitus einen Einfluss auf die postoperative Früh-Kontinenz bei PCa-Patienten hat, die eine RP erhalten haben.
Nach Vorliegen des Ethikkomitee-Beschluss erfolgte mit Hilfe der RP-Datenbank der Klinik für Urologie, Johann Wolfgang-Goethe-Universität die Patientenidentifizierung im Zeitraum von 2018 bis 2021. Hierbei wurden Patienten in die Studienkohorte eingeschlossen bei denen Informationen bezüglich der Früh-Kontinenz (30-90 Tage postoperativ) vorlagen. Kontinenz wurde definiert als die Verwendung von keiner bzw. einer Sicherheitsvorlage innerhalb eines Zeitraums von 24 Stunden. Neben Auswertung der Kontinenz-Raten hinsichtlich des Diabetes Mellitus Status, erfolgte die Zuhilfenahme von uni- und multivariablen logistische Regressionsanalysen um den Effekt von Diabetes Mellitus auf die Kontinenz zu untersuchen. Kovariablen beinhalteten das pathologisches Tumorstadium, BMI, Alter, OP-Verfahren und Durchführung einer Nerv-Erhaltung.
Innerhalb der Studienkohorte (n=142) lag eine Diabetes Mellitus Erkrankung bei 15 Patienten (11%) vor. Mit Ausnahme eines höheren BMI (Median: 28.6 vs 26.5 m2/kg; p=0.005) bei Diabetes Mellitus Patienten, bestanden keine signifikanten Unterschiede hinsichtlich Patienten und Tumorcharakteristika zwischen den beiden Gruppen (p>0.05). Die Früh-Kontinenz Rate war bei Diabetes Mellitus Patienten geringer im Vergleich zu der restlichen Studienkohorte (33 vs 63%; p=0.03). Dieser Unterschied spiegelte sich ebenfalls in der univariablen logistischen Regressionsanalyse wider, in der Diabetes Mellitus einen signifikanten Einfluss auf die Früh-Kontinenz aufwies (Odds Ratio [OR]: 0.29, 95%-KI [95%-Konfidenz Interval]: 0.09-0.99; p=0.03). Der signifikante Einfluss von Diabetes Mellitus blieb ebenfalls in der multivariablen logistischen Regressionsanalyse fortbestehen, nachdem weitere Kovariablen berücksichtigt wurden (OR: 0.26; 95%-KI: 0.07-0.86; p=0.03). Unter Berücksichtigung der Limitationen der vorliegenden Studie (retrospektives Studiendesign, limitierte Fallzahl) lassen die Ergebnisse darauf schließen, dass das Vorliegen einer Diabetes Mellitus Erkrankung einen negativen Einfluss auf die Wiedererlangung der Kontinenz zu einem frühen Zeitpunkt nach RP hat. Die vorliegenden Ergebnisse haben für den klinischen Alltag wichtige Implikationen. Im Rahmen der Aufklärung vor RP kann der Patient bezüglich seines individuellen Risikos einer verlängerten postoperativen Inkontinenz entsprechend aufgeklärt werden, um somit die Erwartungshaltung des Patienten realitätsgetreu zu adressieren. Betrachtet man den postoperativen Verlauf, legen die vorliegenden Ergebnisse nahe, dass Diabetes mellitus Patienten aufgrund Ihrer geringeren Früh-Kontinenz Rate von einer intensivierte Beckenboden-Training zur Wiedererlangung der Kontinenz besonders profitieren könnten.
Auf der Grundlage dieser Studie sollten multizentrische Studien mit einer umfangreicheren Kohortengröße erfolgen und den Einfluss von Diabetes Mellitus nicht nur auf die Früh-Kontinenz, sondern ebenfalls auf die langfristige Kontinenz (>12 Monate) zu untersuchen
Inflammation is a crucial host defense mechanism activated in response to injury or infection. Its primary goal is to eliminate the source of the disturbance, repair the damaged tissue, and restore homeostasis. Inflammatory processes can be recognized through increased blood flow, higher vascular permeability, and the recruitment of leukocytes and plasma proteins to the tissue. A pathogen-induced inflammation triggers various pro- and anti-inflammatory processes. Local tissue cells and Toll-like receptors call upon innate immune cells like neutrophils, dendritic cells (DCs), and monocytes to respond to the intruder. They move across the endothelium and respond to local signals by releasing mediators or cytotoxic compounds, phagocytosing, or polarizing. To study local pathogen-induced inflammation, a zymosan-induced inflammation model was used in the hind paws of mice, which caused a Toll-like receptor 2 mediated inflammation. Multi-Epitope-Ligand-Cartography (MELC) was used for multiple sequential immunohistochemistry with 40 different antibodies on the same tissue. Bioinformatic analysis and graphical representation revealed a specific inflammatory architecture consisting of three major areas based on macrophage polarization and their cellular neighborhoods: a core region containing the pathogen, a pro-inflammatory region containing M1-like macrophages, and a region containing anti-inflammatory cells. This discovery highlights the coexistence of pro- and antiinflammatory processes during an ongoing inflammation and challenges the concept of a gradual temporal transition from pro- to anti-inflammation. Flow cytometry of the whole paw was performed to support and refine the MELC results. Eosinophils were used as a specific immune cell population to investigate their role in the inflammatory structure. They were found to be present in all three inflammatory regions, adapting their cytokine profile according to their localization. Depleting eosinophils reduced Interleukin 4 (IL-4)- levels, increased edema formation, and mechanical and thermal hypersensitivities during inflammation resolution. In the absence of eosinophils, pro- and anti-inflammatory region could not be determined in the inflammatory architecture, neutrophil numbers increased, and efferocytosis and M2-macrophage polarization were reduced. IL-4 administration restored these regions, normalized neutrophil numbers, efferocytosis, M2-macrophage polarization, and resolution of zymosan-induced hypersensitivity. The results show that eosinophils expressing IL-4 support the resolution of inflammation by enabling the development of an anti-inflammatory framework that encloses pro-inflammatory regions.
Einleitung: Allergisches Asthma bronchiale ist eine chronische Atemwegserkrankung, deren Prävalenz zunimmt. Angesichts der immensen gesellschaftlichen und individuellen Belastung durch Asthma ist es dringend erforderlich, neue Strategien zur Behandlung der Krankheit zu entwickeln. Immunologisch ist allergisches Asthma durch ein Ungleichgewicht zwischen TH2-Zellen und TH1-Zellen gekennzeichnet, das durch regulatorische T-Zellen (Tregs) reguliert wird. Tregalizumab ist ein monoklonaler IgG-Antikörper, der Tregs selektiv aktiviert. Ziel der vorliegenden Arbeit war es daher, die Wirkung von Tregalizumab auf die allergeninduzierte allergische Entzündung bei Patienten mit Hausstaubmilbenallergie anhand eines bronchialen Provokationsmodells zu untersuchen.
Methoden: In einer prospektiven, randomisierten, doppelblinden und placebokontrollierten Studie wurden 42 Probanden mit allergischem Asthma und Hausstaubmilbenallergie zwölf Wochen lang mit Tregalizumab 100 mg oder Placebo behandelt. Bronchiale Provokation mit HSM wurde vor (V4) und nach (V17) Tregalizumab-Gabe durchgeführt. Induziertes Sputum (Visite V5, V16, V18) und peripheres Blut (Visite V4, V5, V18) wurden entnommen und Zelldifferenzierung, Zytokine und Transkriptionsfaktoren wurden durch Mikroskopie, Durchflusszytometrie bzw. RT-PCR bewertet.
Ergebnisse: Sowohl in der Verum- als auch in der Placebogruppe zeigte sich zwischen Visite V5 (24 Stunden nach Provokation) und vier Wochen nach Provokation bei Visite V16 (p<0,05) ein signifikanter Rückgang des Anteils eosinophiler Granulozyten (wie auch des ECP-Levels). Interessanterweise konnte bei V18 (24 Stunden nach Provokation) nur in der Placebogruppe ein signifikanter Anstieg beobachtet werden (p<0,01). Die Konzentration des TH-2-Zytokins IL-5 nahm zwischen V5 und V16 in der Verumgruppe signifikant ab (p<0,05). Zwischen V16 und V18 konnte wiederum nur in der Placebogruppe ein signifikanter Anstieg festgestellt werden (p<0,01). Dieser spätere Effekt wurde auch auf Protein- und Transkriptionsebene und im peripheren Blut sowie bei der Expression des Transkriptionsfaktors FoxP3 gefunden. Auf der Ebene der TH-1-Zytokine konnten keine signifikanten Veränderungen festgestellt werden.
Diskussion: Der Anteil eosinophiler Granulozyten, die Konzentration von IL-5 in Blut und Sputum sowie die Konzentration von ECP im Sputum haben sich als gute Parameter zur Beurteilung der Entzündungsreaktion bei unseren Studienteilnehmern erwiesen. Wir haben gezeigt, dass allergische Entzündungen, die durch das Provokationsmodell verursacht wurden, durch die analysierten Parameter im Sputum, aber auch im Blut gut überwacht werden konnten. Ein klinischer Effekt von Tregalizumab konnte in dieser Studie jedoch nicht festgestellt werden und dieses Ergebnis stimmt gut mit der Analyse der Entzündungsparameter im induzierten Sputum überein.
Essentials
• The role of platelet IL-1β release in chronic inflammation is currently unclear.
• Platelets from 65 patients with varying degrees of chronic inflammation were studied.
• Chronic inflammation linked to reduced levels of intracellular IL-1β and IL-1β release.
• Chronic inflammation induces a phenotype that indicates chronic IL-1β release from platelets.
Abstract
Background: Chronic inflammation is a cardiovascular risk factor, and interleukin-1β (IL-1β) is central to the inflammatory host response. Platelets contain the NLRP3 inflammasome and are able to translate IL-1β messenger RNA (mRNA) and secrete mature IL-1β upon activation. However, the role of a chronic inflammatory environment in platelet IL-1β mRNA and protein content remains unclear.
Objectives: The aim of the current study was to investigate intracellular platelet IL-1β and IL-1β mRNA in a chronic inflammatory state.
Methods: Sixty-five patients with stable inflammation (ie, high-sensitivity C-reactive protein within predefined margins in 2 separate measurements) were stratified according to high-sensitivity C-reactive protein levels in low (0.0-0.9 mg/L), medium (1.0-2.9 mg/L), and high (3.0-9.9 mg/L) risk groups. Platelet reactivity as well as platelet IL-1β protein synthesis were studied.
Results: The highest risk group was characterized by a distinct cardiovascular risk profile and approximately 20% higher platelet counts. While platelet reactivity was not different, a reduction in intracellular platelet IL-1β mRNA and IL-1β protein levels was observed in the highest risk group and was linked to decreased platelet size and granularity. This signature suggests a phenotype of chronic IL-1β secretion and could be experimentally phenocopied by stimulation of platelets from healthy volunteers with either TRAP-6 or collagen related peptide (CRP-XL).
Conclusion: Our data suggest a phenotype of chronic IL-1β secretion by platelets in patients with chronic sterile inflammation.
Seit Beginn des 20. Jahrhunderts verzeichnete das ärztliche Berufsfeld einen steten Zuwachs von Frauen. Gegenwärtig weist insbesondere die Pädiatrie einen besonders hohen Frauenanteil auf. Es ist jedoch zu beobachten, dass ungeachtet dessen, Führungspositionen weiterhin vorwiegend von Männern besetzt bleiben.
Vor diesem Hintergrund wurden in der vorliegenden Studie Geschlechterdisparitäten in der pädiatrischen Forschung anhand von wissenschaftlichen Autorenschaften für den Zeitraum von 2008 bis 2018 untersucht.
Insgesamt wurden 690 436 Autorenschaften aus 156 642 englischsprachigen Originalartikeln für die Untersuchung herangezogen. Die Analyse umfasste den Anteil weiblicher Autorenschaften (Female Authorship Proportion, FAP), die Verteilung auf Erst-, Co- und Letzt-Autorenschaften, geschlechtsspezifische Zitationsraten, eine Produktivitätsanalyse sowie Untersuchungen zu Journalen, Ländern und pädiatrischen Teildisziplinen.
Insgesamt betrug der Anteil weiblicher Autorenschaften 46,6%. Dabei fanden sich Autorinnen auf 52,0% der Erst-, 47,6% der Co- und 37,5% der Letzt-Autorenschaften. Auch die Odds Ratio weiblicher Autorenschaft (Female Authorship Odds Ratio, FAOR) war jeweils am höchsten für die Erst-Autorenschaft (1,30) und am niedrigsten für die Letzt-Autorenschaft (0,63). Auf prestigeträchtigen Erst- und Letzt-Autorenschaften waren Frauen mit einem Prestige-Index (PI) von -0,13 insgesamt unterrepräsentiert. Der zeitliche Verlauf offenbarte einen Zuwachs weiblicher Autorenschaften, mit Akzentuierung auf Erst- und Letzt-Autorenschaften.
In den Teilanalysen von einzelnen Ländern, Journalen und pädiatrischen Teildisziplinen konnte jeweils eine erhebliche Spannbreite der FAP sowie des PI festgestellt werden. Dabei wiesen beinahe alle Länder und Journale sowie sämtliche pädiatrischen Teildisziplinen eine signifikante Unterrepräsentation von Frauen auf Letztautorenschaften auf. Zwischen dem Einfluss eines Journals und dessen FAP oder PI konnte keine lineare Korrelation nachgewiesen werden.
Die Produktivitätsanalyse ergab, dass männliche Autoren im Schnitt mehr Artikel veröffentlichten als weibliche Autoren. Der Großteil der Autorinnen (64,7%) veröffentlichte während des untersuchten Zeitraums einen einzigen wissenschaftlichen Artikel. Zitationszahlen sowie die Repräsentanz in Multiautorenartikeln zeigten sich jeweils annähernd geschlechterneutral.
Die erzielten Resultate dieser Analyse ließen Rückschlüsse auf die Integration von Frauen in der pädiatrischen Forschung zu. Insgesamt war die weibliche Repräsentanz in der Pädiatrie, insbesondere in Relation zu anderen Wissenschaftsbereichen, hoch. Der sukzessive Anstieg der FAP über den untersuchten Zeitraum spiegelte den zunehmenden Anteil von Frauen in der Pädiatrie wider. In den Bereichen Zitationsraten und Prestige-Index kam eine annähernde Geschlechterparität zum Ausdruck.
Deutliche Disparitäten wurden dahingegen bei Betrachtung der Verteilungsmuster von weiblichen Erst-, Co- und Letzt-Autorenschaften aufgedeckt. Hier zeigte sich eine Karrieredichotomie: Frauen waren auf Erst-Autorenschaften überrepräsentiert, was vornehmlich dem Karrierebeginn entspricht. Männer waren dahingegen auf Letzt-Autorenschaften überrepräsentiert, was wiederum mit leitenden Positionen assoziiert ist.
Interessanterweise konnten auf globaler Ebene hohe Wachstumsraten der FAP für Letzt-Autorenschaften und eine deutlich ansteigende FAOR für eine Letzt-Autorenschaft festgestellt werden. Diese Ergebnisse implizieren, dass Wissenschaftlerinnen vermehrt, Führungspositionen besetzten. Linearen Hochrechnungen zufolge ist in den kommenden Jahren mit verbesserten Karrierechancen für Frauen in der pädiatrischen Forschung zu rechnen
Im Rahmen dieser publikationsbasierten Dissertation wurden drei wissenschaftliche Arbeiten veröffentlicht. Als Erstautorenschaft wurde 2022 die Arbeit “Effectiveness of High-intensity Focused Ultrasound (HIFU) Therapy of Solid and Complex Benign Thyroid Nodules - A Long-term Follow up Two-center Study.” im Journal “Experimental and Clinical Endocrinology & Diabetes” veröffentlicht. Im Folgenden wird der Inhalt dieser Arbeit dargelegt. Ein kurzer Überblick über die Ergebnisse der anderen beiden mitpublizierten Arbeiten findet sich im Kapitel „Weitere Ergebnisse der Arbeitsgruppe“.
Durch die hohe Prävalenz benigner Schilddrüsenknoten sind deren Behandlungsalternativen von großem wissenschaftlichem Interesse. Dabei bildet die nebenwirkungsarme, minimalinvasive Thermoablation mittels high-intensity focused ultrasound (HIFU) eine attraktive Alternative zu herkömmlichen Verfahren wie der Schilddrüsenchirurgie oder der Radioiodtherapie. Bei der HIFU-Echotherapie werden die Schilddrüsenknoten auf 80 - 90 Grad Celsius erhitzt, sodass eine irreversible Koagulationsnekrose entsteht. Um den Therapieprozess und die Indikationsstellung von HIFU bei benignen Schilddrüsenknoten zu optimieren, ist es notwendig, genaue Studien durchzuführen.
Ziel der vorliegenden bizentrischen Langzeitstudie war, die Effektivität von HIFU-Echotherapien bei benignen Schilddrüsenknoten zu evaluieren und erstmalig den Einfluss der Knotenmorphologie auf den Therapieerfolg zu untersuchen. Vor der Therapie und in regelmäßigen Intervallen nach der Therapie wurden die Größe und die Morphologie der Schilddrüsenknoten mittels Ultraschall dokumentiert. In der retrospektiven Studie wurden Daten von 58 Patienten ausgewertet. Dabei wurde die Gesamtpopulation in eine Gruppe mit soliden und in eine Gruppe mit komplexen Knoten eingeteilt. Die durchschnittliche prozentuale Volumenreduktion in jeder Gruppe wurde mit dem Wilcoxon-Signed-Rank Test statistisch analysiert.
Die Gesamtpopulation zeigte eine Volumenreduktion der zuvor abladierten Knoten von 38.86 % nach 3 Monaten (Spannweite: 4.03 % - 91.16 %, p < 0.0001, n = 25), 42.7 % nach 6 Monaten (Spannweite: 7.36 % - 93.2 %, p < 0.0001, n = 18), 62.21 % nach 9 Monaten (Spannweite: 12.88 % - 93.2 %, p = 0.0078, n = 8) und 61.42 % nach 12 Monaten (Spannweite: 39.39 % - 93.2 %, p > 0.05, n = 4). Die soliden Knoten hatten eine Volumenreduktion von 49.98 % nach 3 Monaten (Spannweite: 4.03 % - 91.16 %, p = 0.0001, n = 15), 46.40 % nach 6 Monaten (Spannweite: 7.36 % - 93.2 %, p = 0.001, n = 11), 65.77 % nach 9 Monaten (Spannweite: 39.39 % - 93.2 %, p = 0.0156, n = 7) und 63.88 % nach 12 Monaten (Spannweite: 39.39 % - 93.2%, p > 0.05, n = 2). Komplexe Knoten hatten eine Volumenreduktion von 35.2 % nach 3 Monaten (Spannweite: 5.85 % - 68.63 %, p = 0.002, n = 10), 36.89 % nach 6 Monaten (Spannweite: 12.23 % - 68.63 %, p = 0.0156, n = 7) und 63.64 % nach 12 Monaten (Spannweite: 52,38 % - 73.91 %, p > 0.05, n = 2).
In der vorliegenden bizentrischen Langzeitstudie wurde deutlich, dass HIFU-Echotherapie eine effektive Behandlungsoption benigner Schilddrüsenknoten ist. Erstmalig gezeigt wurde der Trend, dass solide Knoten besser auf HIFU-Echotherapie ansprechen als komplexe Knoten.
Anhand der gewonnenen Ergebnisse und der neuen Erkenntnisse zum Einfluss der Knotenmorphologie auf die HIFU-Echotherapie benigner Schilddrüsenknoten kann HIFU als Therapieoption besser bewertet werden. Eine differenziertere Indikationsstellung in Bezug auf solide und komplexe Knoten wird ermöglicht und die HIFU-Echotherapie kann gegen andere thermoablative Verfahren abgewogen werden.
Highlights
• An airport can result in high particle concentrations in a distant residential area.
• The particle size distribution indicated the airport as the main source of particles.
• Lower air traffic during the COVID-19 pandemic lead to lower particle concentrations.
• The particle concentration showed high temporal variations.
Abstract
Exposure to ultrafine particles has a significant influence on human health. In regions with large commercial airports, air traffic and ground operations can represent a potential particle source. The particle number concentration was measured in a low-traffic residential area about 7 km from Frankfurt Airport with a Condensation Particle Counter in a long-term study. In addition, the particle number size distribution was determined using a Fast Mobility Particle Sizer.
The particle number concentrations showed high variations over the entire measuring period and even within a single day. A maximum 24 h-mean of 24,120 cm−3 was detected. Very high particle number concentrations were in particular measured when the wind came from the direction of the airport. In this case, the particle number size distribution showed a maximum in the particle size range between 5 and 15 nm. Particles produced by combustion in jet engines typically have this size range and a high potential to be deposited in the alveoli. During a period with high air traffic volume, significantly higher particle number concentrations could be measured than during a period with low air traffic volume, as in the COVID-19 pandemic.
A large commercial airport thus has the potential to lead to a high particle number concentration even in a distant residential area. Due to the high particle number concentrations, the critical particle size, and strong concentration fluctuations, long-term measurements are essential for a realistic exposure analysis.
Highlights
• Currently, China has the most publications, ahead of the USA and European countries.
• Research focuses are strictly separated into ecological and material science topics.
• Russia and Ukraine are among the frontrunners with a clear focus on materials science.
• The focus in PFAS research is shifting toward ecological issues.
• A national imbalance can be observed that leaves the low economies behind.
Abstract
The European Commission's current efforts to launch the largest proposal to restrict per- and polyfluoroalkyl substances (PFAS) in history reflect the dire global plight of PFAS accumulation in the environment and their health impacts. While there are existing studies on PFAS research, there is a lack of comprehensive analysis that both covers the entire research period and provides deep insights into global research patterns, incentives, and barriers based on various parameters. We have been able to demonstrate the increasing interest in PFAS research, although citation numbers are declining prematurely. Policy regulations based on proving and establishing the toxicity of PFASs have stimulated research in developed countries and vice versa, with increasing emphasis on ecological aspects. China, in particular, is investing increasingly in PFAS research, but without defining or implementing regulations - with devastating effects. The separation of industrial and environmental research interests is clear, with little involvement of developing countries, even though their exposure to PFAS is devastating. It, therefore, requires increased globally networked and multidisciplinary approaches to address PFAS contamination challenges.
Studying the neural basis of human dynamic visual perception requires extensive experimental data to evaluate the large swathes of functionally diverse brain neural networks driven by perceiving visual events. Here, we introduce the BOLD Moments Dataset (BMD), a repository of whole-brain fMRI responses to over 1,000 short (3s) naturalistic video clips of visual events across ten human subjects. We use the videos’ extensive metadata to show how the brain represents word- and sentence-level descriptions of visual events and identify correlates of video memorability scores extending into the parietal cortex. Furthermore, we reveal a match in hierarchical processing between cortical regions of interest and video-computable deep neural networks, and we showcase that BMD successfully captures temporal dynamics of visual events at second resolution. With its rich metadata, BMD offers new perspectives and accelerates research on the human brain basis of visual event perception.
Highlights
• High resolution profile of C. pipiens' sugar diet has been obtained using UHPLC-MS.
• Artificial feeding using ornamental plants provides similar sugar profiles as observed in field collected mosquitoes.
• Metabolomic profiling found secondary metabolites and pollutants of anthropogenic use.
Abstract: Culex pipiens (Linnaeus, 1758) mosquitoes search plant sources of sugars to cope with the energetic demand of various physiological processes. The crop as part of the digestive system is devoted to the storage of sugar-based meal obtained from various nectars sources. The profiling of sugars and metabolites in the Culex pipiens’ crop is scarce, and only few studies used Liquid Chromatography – Mass Spectrometry (LC-MS), which provides broad detection for biomonitoring environmental substances and even contaminants in the sugar diet of mosquitoes populations.
Therefore, sugar and metabolite profiling were performed on crops obtained from mosquitoes exposed to plant nectar under laboratory or natural conditions by Ultra High-Performance LC-MS (UHPLC-MS). This method allowed us a precise quantitative and qualitative identification of sugar diet and associated environmental compounds in the crop of the mosquito C. pipiens. Under laboratory condition, mosquitoes were allowed to feed on either glucose solution, commercially-available flowers or field collected flowers. In addition, we collected mosquitoes from the field to compare those crop metabolomes with metabolome patterns occurring after nectar feeding in the lab.
The sugar quantities and quality obtained from the crops of mosquitoes collected in the field were similar to those crops obtained from mosquitoes that fed on commercially-available flowers and from field collected flowers with a limit of detection of 10 μg/L for sucrose, glucose and sucrose. Next to sugar compounds, we identified 2 types of amino acids, 12 natural products, and 9 pesticides.
Next to the diversity of sugar compounds, we could confirm that secondary metabolites and environmental pollutants are typically up taken from floral nectar sources by C. pipiens. The in-depth knowledge on mosquito–plant interactions may inspire the development and further optimization of mosquito trap systems and arboviral surveillance systems.
We provide in this paper a comprehensive comparison of various transfer learning strategies and deep learning architectures for computer-aided classification of adult-type diffuse gliomas. We evaluate the generalizability of out-of-domain ImageNet representations for a target domain of histopathological images, and study the impact of in-domain adaptation using self-supervised and multi-task learning approaches for pretraining the models using the medium-to-large scale datasets of histopathological images. A semi-supervised learning approach is furthermore proposed, where the fine-tuned models are utilized to predict the labels of unannotated regions of the whole slide images (WSI). The models are subsequently retrained using the ground-truth labels and weak labels determined in the previous step, providing superior performance in comparison to standard in-domain transfer learning with balanced accuracy of 96.91% and F1-score 97.07%, and minimizing the pathologist's efforts for annotation. Finally, we provide a visualization tool working at WSI level which generates heatmaps that highlight tumor areas; thus, providing insights to pathologists concerning the most informative parts of the WSI.
• Mexican and German populations of L. sericata differ in their development times.
• Mexican L. sericata had a shorter development time at 20°C than German flies.
• At 30 °C, German L. sericata pupariated and eclosed earlier than the Mexican flies.
• Differences in study design make the comparison of developmental studies difficult.
Abstract
The cosmopolitan blow fly Lucilia sericata is often used in forensic case work for estimating the minimum postmortem interval (PMImin). For this, the age of immature specimens developing on the dead body is calculated by measuring the time taken to reach the sampled developmental stage at a given temperature. To test whether regional developmental data of L. sericata is valid on a global scale, the time taken to reach different developmental stages was compared between a population from Mexico and one from Germany at two different constant temperatures.
The German population of L. sericata was collected in Frankfurt/Main, while the Mexican population originated near Oaxaca de Juarez and was transported to Germany in the larval stage. Only the F1 generation was used to avoid adaption of the Mexican flies. Eggs were immediately placed at 20 °C and 30 °C. Five times 30 freshly eclosed larvae per replicate (n = 5) were then transferred to a cup of minced meat in separate containers. The larvae were checked every 8 h for migration, pupariation or emergence of adult flies. The time at which the first individual and 50 % of the specimens per container entered each of these stages, was recorded.
Significant differences in the time of development between the two populations were observed at both temperatures. At 20 °C, the first specimens of the Mexican population reached all developmental stages a little (< 1 day to < 2 days) earlier than the German L. sericata. At 30 °C, the Mexican flies also reached the post-feeding stage slightly earlier (0.2 days). However, at 30 °C, the German flies started pupariation significantly earlier (after 5 days) than the Mexican flies (6.9 days) and the adults from Germany also emerged earlier (10.5 days compared to 13.1 days). The same pattern was observed when looking at 50 % of the total number of specimens per container. A comparison with previously published developmental studies was difficult as the experimental design varied widely between studies. However, the results were within the range of most studies. Our study has shown that age estimation can vary widely depending on the population on which the reference data used for the calculations are based. This highlights the importance of using local and population-specific developmental data for estimating the age of blow flies in case work.
• Mexican and German populations of L. sericata differ in their development times.
• Mexican L. sericata had a shorter development time at 20°C than German flies.
• At 30 °C, German L. sericata pupariated and eclosed earlier than the Mexican flies.
• Differences in study design make the comparison of developmental studies difficult.
Abstract
The cosmopolitan blow fly Lucilia sericata is often used in forensic case work for estimating the minimum postmortem interval (PMImin). For this, the age of immature specimens developing on the dead body is calculated by measuring the time taken to reach the sampled developmental stage at a given temperature. To test whether regional developmental data of L. sericata is valid on a global scale, the time taken to reach different developmental stages was compared between a population from Mexico and one from Germany at two different constant temperatures.
The German population of L. sericata was collected in Frankfurt/Main, while the Mexican population originated near Oaxaca de Juarez and was transported to Germany in the larval stage. Only the F1 generation was used to avoid adaption of the Mexican flies. Eggs were immediately placed at 20 °C and 30 °C. Five times 30 freshly eclosed larvae per replicate (n = 5) were then transferred to a cup of minced meat in separate containers. The larvae were checked every 8 h for migration, pupariation or emergence of adult flies. The time at which the first individual and 50 % of the specimens per container entered each of these stages, was recorded.
Significant differences in the time of development between the two populations were observed at both temperatures. At 20 °C, the first specimens of the Mexican population reached all developmental stages a little (< 1 day to < 2 days) earlier than the German L. sericata. At 30 °C, the Mexican flies also reached the post-feeding stage slightly earlier (0.2 days). However, at 30 °C, the German flies started pupariation significantly earlier (after 5 days) than the Mexican flies (6.9 days) and the adults from Germany also emerged earlier (10.5 days compared to 13.1 days). The same pattern was observed when looking at 50 % of the total number of specimens per container. A comparison with previously published developmental studies was difficult as the experimental design varied widely between studies. However, the results were within the range of most studies. Our study has shown that age estimation can vary widely depending on the population on which the reference data used for the calculations are based. This highlights the importance of using local and population-specific developmental data for estimating the age of blow flies in case work.
Marjan van den Akker, Gesundheitswissenschaftlerin und Epidemiologin : Goethe, Deine Forscher
(2024)
Beyond well-established difficulties with working memory in individuals with attention deficit hyperactivity disorder (ADHD), evidence is emerging that other memory processes may also be affected. We investigated, first, which memory processes show differences in adults and adolescents with ADHD in comparison to control participants, focusing on working and short-term memory, initial learning, interference, delayed and recognition memory. Second, we investigated whether ADHD severity, co-occurring depressive symptoms, IQ and physical fitness are associated with the memory performance in the individuals with ADHD.
We assessed 205 participants with ADHD (mean age 25.8 years, SD 7.99) and 50 control participants (mean age 21.1 years, SD 5.07) on cognitive tasks including the digit span forward (DSF) and backward (DSB), the Rey Auditory Verbal Learning Test (RAVLT), and the vocabulary and matrix reasoning subtests of the Wechsler Abbreviated Scale of Intelligence. Participants with ADHD were additionally assessed on ADHD severity, depression symptoms and cardiorespiratory fitness. A series of regressions were run, with sensitivity analyses performed when variables were skewed.
ADHD-control comparisons were significant for DSF, DSB, delayed and recognition memory, with people with ADHD performing less well than the control participants. The result for recognition memory was no longer significant in sensitivity analysis. Memory performance was not associated with greater ADHD or depression symptoms severity. IQ was positively associated with all memory variables except DSF. Cardiorespiratory fitness was negatively associated with the majority of RAVLT variables.
Individuals with ADHD showed difficulties with working memory, short-term memory and delayed memory, as well as a potential difficulty with recognition memory, despite preserved initial learning.
Targeted protein degradation (TPD) has recently emerged as an exciting new drug modality. However, the strategy of developing small molecule-based protein degraders has evolved over the past two decades and has now established molecular tags that are already in clinical use, as well as chimeric molecules, PROteolysis TArgeting Chimeras (PROTACs), based mainly on ligand systems developed for the two E3 ligases CRBN and VHL. The large size of the human E3 ligase family suggests that PROTACs can be developed by targeting a large diversity of E3 ligases, some of which have restricted expression patterns with the potential to design disease- or tissue-specific degraders. Indeed, many new E3 ligands have been published recently, confirming the druggability of E3 ligases. This review summarises recent data on E3 ligases and highlights the challenges in developing these molecules into efficient PROTACs rivalling the established degrader systems.
PET probes targeting fibroblasts are frequently used for varying applications in oncology. In recent years, the clinical spectrum has been expanded towards cardiovascular medicine, e.g., after myocardial infarction, in aortic stenosis or as a non-invasive read-out of atherosclerosis. We herein provide a brief overview of the current status of this PET radiotracer in the context of cardiovascular disease, including translational and clinical evidence. In addition, we will also briefly discuss future applications, e.g., the use of fibroblast-targeting PET to investigate bilateral organ function along the cardiorenal axis.
Highligthts
• Marburg virus infects and replicates in primary human proximal tubular cells (PTC).
• Transcriptome analyses at multiple time points revealed a profound inflammatory response by IFNα, -y and TNFα signaling.
• Among the strongly downregulated gene sets were targets of the transcription factors MYC and E2F, the G2M checkpoint, as well as oxidative phosphorylation.
• Importantly, the downregulated factors comprise PGC-1α, a key factor in mitochondrial biogenesis and renal energy homeostasis, to be substantially downregulated in MARV-infected PTC.
• Our results suggest inflammation-induced changes in tubular energy metabolism as a possible factor in MARV-associated tubular dysfunction.
Abstract
Marburg virus, a member of the Filoviridae, is the causative agent of Marburg virus disease (MVD), a hemorrhagic fever with a case fatality rate of up to 90 %. Acute kidney injury is common in MVD and is associated with increased mortality, but its pathogenesis in MVD remains poorly understood. Interestingly, autopsies show the presence of viral proteins in different parts of the nephron, particularly in proximal tubular cells (PTC). These findings suggest a potential role for the virus in the development of MVD-related kidney injury. To shed light on this effect, we infected primary human PTC with Lake Victoria Marburg virus and conducted transcriptomic analysis at multiple time points. Unexpectedly, infection did not induce marked cytopathic effects in primary tubular cells at 20 and 40 h post infection. However, gene expression analysis revealed robust renal viral replication and dysregulation of genes essential for different cellular functions. The gene sets mainly downregulated in PTC were associated with the targets of the transcription factors MYC and E2F, DNA repair, the G2M checkpoint, as well as oxidative phosphorylation. Importantly, the downregulated factors comprise PGC-1α, a well-known factor in acute and chronic kidney injury. By contrast, the most highly upregulated gene sets were those related to the inflammatory response and cholesterol homeostasis. In conclusion, Marburg virus infects and replicates in human primary PTC and induces downregulation of processes known to be relevant for acute kidney injury as well as a strong inflammatory response.
Background: Urachal cancer (UrC) is a rare disease with limited availability of representative incidence and clinical data. Although, the prevalence is accounting for less than 1% of bladder tumors, the 5-year survival rate is around only 50% for patients with resectable tumors, and even worse for patients with metastatic disease. Due to the lack of comprehensive prospective studies, our current knowledge of UrC is still limited.
Objective: The present study aimed to summarize the available registry-based studies with unselected UrC patients to evaluate its incidence and clinicopathological characteristics.
Material and methods: We conducted a systematic literature search of registry-based UrC publications on the 15th of May 2023 in 5 databases, which identified 4,748 publications. After duplicate removal and selection by 2 independent investigators, 6 publications proved to be appropriate for the final meta-analysis. Estimated incidence and clinicopathological parameters were extracted.
Results: Estimated incidence ranged between 0.022 and 0.060/ 100.000 person-years, with the highest occurrence in Japan and the lowest in Canada, while the random effect model calculated an overall incidence rate of 0.04 (95%CI: 0.03–0.05) 100.000 person-years. The median age at first diagnosis was 60 years (range: 58–64). The female to male ratio was 2:3. Lymph node or distant metastases were present in 9% and 14% of patients. The predominant tumour type was adenocarcinoma (86%) followed by urothelial carcinoma (12%) and squamous cell carcinoma (2%). The 5-year survival rate was 51.0% with 95%CI: 45.2–57.4.
Conclusions: Our study provides an up-to-date comparison of estimated incidence rates between 6 countries of 3 continents based on rigorously selected registry-based studies. The results suggest low incidence rates for UrC with considerable geographic differences. The present meta-analysis provides unbiased registry-based data on the incidence, clinicopathological parameters and survival of UrC.
Understanding the underlying mechanisms that link psychopathology and physical comorbidities in schizophrenia is crucial since decreased physical fitness and overweight pose major risk factors for cardio-vascular diseases and decrease the patients’ life expectancies. We hypothesize that altered reward anticipation plays an important role in this. We implemented the Monetary Incentive Delay task in a MR scanner and a fitness test battery to compare schizophrenia patients (SZ, n = 43) with sex- and age-matched healthy controls (HC, n = 36) as to reward processing and their physical fitness. We found differences in reward anticipation between SZs and HCs, whereby increased activity in HCs positively correlated with overall physical condition and negatively correlated with psychopathology. On the other handy, SZs revealed stronger activity in the posterior cingulate cortex and in cerebellar regions during reward anticipation, which could be linked to decreased overall physical fitness. These findings demonstrate that a dysregulated reward system is not only responsible for the symptomatology of schizophrenia, but might also be involved in physical comorbidities which could pave the way for future lifestyle therapy interventions.
Highlights
• CD62p + exosomes were significantly increased in septic polytrauma-patients, while CD40+, as well as CD49e + exosomes were diminished.
• Exosomal IL-6 concentration in septic patients reflects the systemic IL-6.
• Exosomal IL-10 concentration seemed to be constant in patients and healthy controls.
• Decrease of miR-21 in exosomes was associated with the development of sepsis, while exosomal miR-93, miR-155 and miR-92a were not specifically altered.
Abstract
Sepsis as a severe systemic inflammation leads oftentimes to organ dysfunction and subsequently to death. In polytrauma patients, septic complications represent with 45% the predominant cause of late death and are responsible for extremely high costs in the healthcare system. Therefore, clinicians have to detect as early as possible the begin of sepsis to improve the patient's outcome. One new promising diagnostic tool to diagnose septic complications in polytraumatized patients are exosomes.
Plasma samples from polytraumatized patients (Injury Severity Score (ISS) ≥16) which developed sepsis (n = 10) and without sepsis (n = 10), were collected at emergency room (ER), 24h and 5 days after trauma. The EVs subpopulations were investigated by a bead-based multiplex flow cytometry measurement of surface epitopes and were compared with plasma EVs from healthy controls (n = 10). Moreover, exosomal cytokine concentrations were measured via high-sensitive ELISA and were correlated with systemic concentrations. For miRNA cargo analysis, we analysed the miRNAs miR-1298-5p, miR-1262, miR-125b-5p, miR-92a-3p, miR-93-5p, miR-155-5p and miR-21-5p and compared their exosomal concentrations by means of RT-qPCR.
CD62p + exosomes were significantly increased in septic polytrauma-patients (p ≤ 0.05), while CD40+exosomes, as well as CD49e + exosomes were diminished (p ≤ 0.05). Furthermore, we observed that the exosomal IL-6 concentration reflects the systemic IL-6 concentration (r2 = 0.63) and did not significantly alter between patients with and without sepsis. The exosomal IL-10 concentration seemed to be constant in all patients and healthy controls. We observed that a decrease of miR-21-5p in exosomes was associated with the development of sepsis (p ≤ 0.05), while exosomal miR-93-5p, miR-155-5p and miR-92a-3p were not specifically altered in septic patients.
Taken together, the present study in polytraumatized patients demonstrated that the development of sepsis is associated with an increase of CD62p + exosomes. Furthermore, the exosomal cargo was changed in septic patients: miR-21-5p was diminished.
Highlights
• Artificial intelligence systems for mechanically ventilated patients are increasing.
• The clinical and financial impact of these models are often unexamined.
• We developed a generic health-economic model for artificial intelligence systems.
• This model assesses the cost-effectiveness for many different scenarios.
• The developed framework is easily adjustable to other (clinical) situations.
Abstract
Purpose: The health and economic consequences of artificial intelligence (AI) systems for mechanically ventilated intensive care unit patients often remain unstudied. Early health technology assessments (HTA) can examine the potential impact of AI systems by using available data and simulations. Therefore, we developed a generic health-economic model suitable for early HTA of AI systems for mechanically ventilated patients.
Materials and methods: Our generic health-economic model simulates mechanically ventilated patients from their hospitalisation until their death. The model simulates two scenarios, care as usual and care with the AI system, and compares these scenarios to estimate their cost-effectiveness.
Results: The generic health-economic model we developed is suitable for estimating the cost-effectiveness of various AI systems. By varying input parameters and assumptions, the model can examine the cost-effectiveness of AI systems across a wide range of different clinical settings.
Conclusions: Using the proposed generic health-economic model, investors and innovators can easily assess whether implementing a certain AI system is likely to be cost-effective before an exact clinical impact is determined. The results of the early HTA can aid investors and innovators in deployment of AI systems by supporting development decisions, informing value-based pricing, clinical trial design, and selection of target patient groups.
Zehn Jahre Mitmenschlichkeit
(2024)
Background: Trauma-related guilt and shame are crucial for the development and maintenance of PTSD (posttraumatic stress disorder). We developed an intervention combining cognitive techniques with loving-kindness meditations (C-METTA) that specifically target these emotions. C-METTA is an intervention of six weekly individual treatment sessions followed by a four-week practice phase.
Objective: This study examined C-METTA in a proof-of-concept study within a randomized wait-list controlled trial.
Method: We randomly assigned 32 trauma-exposed patients with a DSM-5 diagnosis to C-METTA or a wait-list condition (WL). Primary outcomes were clinician-rated PTSD symptoms (CAPS-5) and trauma-related guilt and shame. Secondary outcomes included psychopathology, self-criticism, well-being, and self-compassion. Outcomes were assessed before the intervention phase and after the practice phase.
Results: Mixed-design analyses showed greater reductions in C-METTA versus WL in clinician-rated PTSD symptoms (d = −1.09), guilt (d = −2.85), shame (d = −2.14), psychopathology and self-criticism.
Conclusion: Our findings support positive outcomes of C-METTA and might contribute to improved care for patients with stress-related disorders. The study was registered in the German Clinical Trials Register (DRKS00023470).
HIGHLIGHTS
C-METTA is an intervention that addresses trauma-related guilt and shame and combines cognitive interventions with loving-kindness meditations.
A proof-of-concept study was conducted examining C-METTA in a wait-list randomized controlled trial
C-METTA led to reductions in trauma-related guilt and shame and PTSD symptoms.
Background: Despite known clinical benefits, guideline-recommended heart rate (HR) control is not achieved for a significant proportion of patients with HF with reduced ejection fraction. The wearable cardioverter-defibrillator (WCD) provides continuous HR monitoring and alerts that could aid medication titration.
Objective: This study sought to evaluate sex differences in achieving guideline-recommended HR control during a period of WCD use.
Methods: Data from patients fitted with a WCD from 2015 to 2018 were obtained from the manufacturer’s database (ZOLL). The proportion of patients with adequate nighttime resting HR control at the beginning of use (BOU) and at the end of use (EOU) were compared by sex. Adequate HR control was defined as having a nighttime median HR <70 beats/min.
Results: A total of 21,440 women and a comparative sample of 17,328 men (median 90 [IQR 59–116] days of WCD wear) were included in the final dataset. Among patients who did not receive a shock, over half had insufficient HR control at BOU (59% of women, 53% of men). Although the proportion of patients with resting HR ≥70 beats/min improved by EOU, 43% of women and 36% of men did not achieve guideline-recommended HR control.
Conclusion: A significant proportion of women and men did not achieve adequate HR control during a period of medical therapy optimization. Compared with men, a greater proportion of women receiving WCD shocks had insufficiently controlled HR in the week preceding ventricular tachyarrhythmia/ventricular fibrillation and 43% of nonshocked women, compared with 36% of men, did not reach adequate HR control during the study period. The WCD can be utilized as a remote monitoring tool to record HR and inform adequate uptitration of beta-blockers, with particular focus on reducing the treatment gap in women.
The ICH M13A draft bioequivalence guideline allows the exclusion of very low plasma profiles from the statistical evaluation in exceptional cases, i.e., if such phenomenon occurs due to non-compliance of subjects (not swallowing the product). Moreover, the draft ICH guideline requests additional bioequivalence studies for medicinal products with pH-dependent solubility after concomitant administration of gastric pH modifying preparations, e.g., proton pump inhibitors. Both regulations are scientifically sound, however, would need further specification. Main problem in this context is that compounds with very low solubility and slow intrinsic dissolution in the intestinal environment will cause significant bioavailability problems if their solid oral dosage forms are emptied from the stomach undisintegrated. Also very low plasma profiles may result under these circumstances. Such cases can occur accidentally and are not resultant of non-compliance. Thus, limitation for one case per study only as suggested in the guideline is not justified.
Nicotinamide adenine dinucleotide (NAD) serves as a cap-like structure on cellular RNAs (NAD-RNAs) in all domains of life including the bacterium Escherichia coli. NAD also acts as a key molecule in phage-host interactions, where bacterial immune systems deplete NAD to abort phage infection. Nevertheless, NAD-RNAs have not yet been identified during phage infections of bacteria and the mechanisms of their synthesis and degradation are unknown in this context. The T4 phage that specifically infects E. coli presents an important model to study phage infections, but a systematic analysis of the presence and dynamics of NAD-RNAs during T4 phage infection is lacking. Here, we investigate the presence of NAD-RNAs during T4 phage infection in a dual manner. By applying time-resolved NAD captureSeq, we identify NAD-capped host and phage transcripts and their dynamic regulation during phage infection. We provide evidence that NAD-RNAs are – as reported earlier – generated by the host RNA polymerase by initiating transcription with NAD at canonical transcription start sites. In addition, we characterize NudE.1 – a T4 phage-encoded Nudix hydrolase – as the first phage-encoded NAD-RNA decapping enzyme. T4 phages carrying inactive NudE.1 display a delayed lysis phenotype. This study investigates for the first time the dual epitranscriptome of a phage and its host, thereby introducing epitranscriptomics as an important field of phage research.
Therapierefraktärer Schmerz ist ein weit verbreitetes, äußerst belastendes Leitsymptom rheumatischer Erkrankungen. Viele Betroffene weichen daher bei Versagen der Standardmedikation selbstständig auf Cannabis oder die strukturell verwandte Substanz Palmitoylethanolamid (PEA) als Add-On- oder Alternativtherapie aus, obwohl dies in Deutschland bisher nur eingeschränkt zulässig ist. Die deutsche Gesetzgebung ist diesbezüglich nicht eindeutig, weshalb Ärzt:innen in ihrer Entscheidung, Cannabis zu verschreiben, auf Leitlinien, Fallberichte und Expert:innenmeinungen zurückgreifen müssen. Dies führt zu schwierigen Einzelfallentscheidungen, da sich die derzeitige Datenlage zu Cannabis-based Medicine (CBM) bzw. PEA und Rheuma als mangelhaft darstellt und die Leitlinien dementsprechend keine klaren Empfehlungen enthalten. Ziel der vorliegenden Arbeit ist es, die vorhandene Evidenz zusammenzufassen, zu ordnen und anhand der Hill-Kriterien den möglichen kausalen Zusammenhang zwischen der Einnahme von CBM bzw. PEA und der analgetischen Wirkung bei Rheumaschmerzen zu prüfen.
The spike protein of SARS-CoV-2 is a highly flexible membrane receptor that triggers the translocation of the virus into cells by attaching to the human receptors. Like other type I membrane receptors, this protein has several extracellular domains connected by flexible hinges. The presence of these hinges results in high flexibility, which consequently results in challenges in defining the conformation of the protein. Here, We developed a new method to define the conformational space based on a few variables inspired by the robotic field’s methods to determine a robotic arm’s forward kinematics. Using newly performed atomistic molecular dynamics (MD) simulations and publicly available data, we found that the Denavit-Hartenberg (DH) parameters can reliably show the changes in the local conformation. Furthermore, the rotational and translational components of the homogenous transformation matrix constructed based on the DH parameters can identify the changes in the global conformation of the spike and also differentiate between the conformation with a similar position of the spike head, which other types of parameters, such as spherical coordinates, fail to distinguish between such conformations. Finally, the new method will be beneficial for looking at the conformational heterogeneity in all other type I membrane receptors.
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.
Der unter der Ägide der Freunde und Förderer der Goethe-Universität von der Paul Ehrlich-Stiftung ausgelobte Paul Ehrlich-und-Ludwig Darmstaedter-Preis ist die renommierteste Auszeichnung, die in Deutschland für medizinische Forschung verliehen wird. Den mit 120.000 Euro dotierten Preis nahm in der Frankfurter Paulskirche in diesem Jahr der Arzt und Immunologe Prof. Dennis L. Kasper (81) von der Harvard Medical School entgegen. Er hat die ersten Wörter der biochemischen Sprache entdeckt, mit der Darmbakterien unserem Immunsystem zu einer gesunden Entwicklung verhelfen. Den mit 60.000 Euro dotierten Nachwuchspreis erhielt der Chemiker Dr. Johannes Karges (31) von der Ruhr-Universität Bochum für die Entwicklung eines Verfahrens zur ferngesteuerten Tumortherapie.
Lifestyle factors—such as diet, physical activity (PA), smoking, and alcohol consumption—have a significant impact on mortality as well as healthcare costs. Moreover, they play a crucial role in the development of type 2 diabetes mellitus (DM2). There also seems to be a link between lifestyle behaviours and insulin resistance, which is often a precursor of DM2. This study uses an enhanced Healthy Living Index (HLI) integrating accelerometric data and an Ecological Momentary Assessment (EMA) to explore differences in lifestyle between insulin-sensitive (IS) and insulin-resistant (IR) individuals. Moreover, it explores the association between lifestyle behaviours and inflammation. Analysing data from 99 participants of the mPRIME study (57 women and 42 men; mean age 49.8 years), we calculated HLI scores—ranging from 0 to 4— based on adherence to specific low-risk lifestyle behaviours, including non-smoking, adhering to a healthy diet, maximally moderate alcohol consumption, and meeting World Health Organization (WHO) PA guidelines. Insulin sensitivity was assessed using a Homeostatic Model Assessment of Insulin Resistance (HOMA-IR) and C-reactive protein (CRP) levels were used as a proxy for inflammation. Lifestyle behaviours, represented by HLI scores, were significantly different between IS and IR individuals (U = 1529.0; p = 0.023). The difference in the HLI score between IR and IS individuals was mainly driven by lower adherence to PA recommendations in the IR group. Moreover, reduced PA was linked to increased CRP levels in the IR group (r = −0.368, p = 0.014). Our findings suggest that enhancing PA, especially among individuals with impaired insulin resistance, holds significant promise as a preventive strategy.
Highlights
• NCoR1 is the most highly expressed endothelial corepressor.
• Loss of NCoR1 promotes angiogenic function in endothelial cells.
• Loss of NCoR1 promotes a tip cell position during angiogenic sprouting.
Abstract
Corepressors negatively regulate gene expression by chromatin compaction. Targeted regulation of gene expression could provide a means to control endothelial cell phenotype. We hypothesize that by targeting corepressor proteins, endothelial angiogenic function can be improved. To study this, the expression and function of nuclear corepressors in human umbilical vein endothelial cells (HUVEC) and in murine organ culture was studied. RNA-seq revealed that nuclear receptor corepressor 1 (NCoR1), silencing mediator of retinoid and thyroid hormone receptors (SMRT) and repressor element-1 silencing transcription factor (REST) are the highest expressed corepressors in HUVECs. Knockout and knockdown strategies demonstrated that the depletion of NCoR1 increased the angiogenic capacity of endothelial cells, whereas depletion of SMRT or REST did not. Interestingly, the effect was VEGF signaling independent. NCoR1 depletion significantly upregulated angiogenesis-associated genes, especially tip cell genes, including ESM1, DLL4 and NOTCH4, as observed by RNA- and ATAC-seq. Confrontation assays comparing cells with and without NCoR1-deficiency revealed that loss of NCoR1 promotes a tip-cell position during spheroid sprouting. Moreover, a proximity ligation assay identified NCoR1 as a direct binding partner of the Notch-signaling-related transcription factor RBPJk. Luciferase assays showed that siRNA-mediated knockdown of NCOR1 promotes RBPJk activity. Furthermore, NCoR1 depletion prompts upregulation of several elements in the Notch signaling cascade. Downregulation of NOTCH4, but not NOTCH1, prevented the positive effect of NCOR1 knockdown on spheroid outgrowth. Collectively, these data indicate that decreasing NCOR1 expression is an attractive approach to promote angiogenic function.
Highlights
• Since there is only a low level of evidence, it is difficult to agree on state-of-the-art standards or to provide recommendations and guidelines.
• The value of combining several monitoring devices for dual or triple guidance must be challenged.
• The principle of fascial plane blocks is suitable to avoid traumatic needle-to-nerve contact. However, local toxicity must be regarded as a possible mechanism for nerve injuries.
• Block procedures might be conducted during sedation or general anesthesia when considering the individual patients' clinical situations and the expertise of the anesthesiologist.
• The quality of ultrasound equipment and education provided by the corresponding anesthesia department is highly relevant
Highlights
• Out of the six edible pumpkin seeds found in Cameroonian C. sativus showed most potent anti-proliferative effects on prostate cells.
• Its oil conserved almost all the effects of raw seeds and prevented benign prostatic hyperplasia (BPH).
• It exhibited potent anti-inflammatory activities in rat with BPH.
Abstract
Pumpkin seeds are claimed to treat prostate tumour/cancer. The in vitro (ability to inhibit cell growth through MTT assay) and in vivo (ability to prevent testosterone-induced BPH in rats at the doses of 125, 250, 500 and 1000 mg/kg BW) of six edible pumpkin seeds found in Cameroonian were assessed. The endpoints were cell growth arrest, prostate mass and volume, prostatic epithelium height, prostatic proteins, prostate specific antigen (PSA) and inflammatory cytokines. In vitro, C. sativus seeds exhibited the most potent antiproliferative effects on DU145 and PC3 prostate cancer cells and its oil conserved almost all the effects of raw seeds. Further, it prevented the increased of prostate relative mass and volume, prostate epithelium height, PSA and testosterone dose-dependently compared to normal rats. This effect is thought to be mediated through antiandrogenic, estrogenic and anti-inflammatory activities, evidenced by a decreased in IL-1β, IL-6 and TNFα level. Overall, this results justify its traditional use.
Viruses that carry a positive-sense, single-stranded (+ssRNA) RNA translate their genomes soon after entering the host cell to produce viral proteins, with the exception of retroviruses. A distinguishing feature of retroviruses is reverse transcription, where the +ssRNA genome serves as a template to synthesize a double-stranded DNA copy that subsequently integrates into the host genome. As retroviral RNAs are produced by the host cell transcriptional machinery and are largely indistinguishable from cellular mRNAs, we investigated the potential of incoming retroviral genomes to directly express proteins. Here we show through multiple, complementary methods that retroviral genomes are translated after entry. Our findings challenge the notion that retroviruses require reverse transcription to produce viral proteins. Synthesis of retroviral proteins in the absence of productive infection has significant implications for basic retrovirology, immune responses and gene therapy applications.
Bipolar disorder (BD) is a heritable mental illness with complex etiology. While the largest published genome-wide association study identified 64 BD risk loci, the causal SNPs and genes within these loci remain unknown. We applied a suite of statistical and functional fine-mapping methods to these loci, and prioritized 22 likely causal SNPs for BD. We mapped these SNPs to genes, and investigated their likely functional consequences by integrating variant annotations, brain cell-type epigenomic annotations, brain quantitative trait loci, and results from rare variant exome sequencing in BD. Convergent lines of evidence supported the roles of SCN2A, TRANK1, DCLK3, INSYN2B, SYNE1, THSD7A, CACNA1B, TUBBP5, PLCB3, PRDX5, KCNK4, AP001453.3, TRPT1, FKBP2, DNAJC4, RASGRP1, FURIN, FES, YWHAE, DPH1, GSDMB, MED24, THRA, EEF1A2, and KCNQ2 in BD. These represent promising candidates for functional experiments to understand biological mechanisms and therapeutic potential. Additionally, we demonstrated that fine-mapping effect sizes can improve performance and transferability of BD polygenic risk scores across ancestrally diverse populations, and present a high-throughput fine-mapping pipeline (https://github.com/mkoromina/SAFFARI).
Rationale and Objectives: Lumbar disk degeneration is a common condition contributing significantly to back pain. The objective of the study was to evaluate the potential of dual-energy CT (DECT)-derived collagen maps for the assessment of lumbar disk degeneration.
Patients and Methods: We conducted a retrospective analysis of 127 patients who underwent dual-source DECT and MRI of the lumbar spine between 07/2019 and 10/2022. The level of lumbar disk degeneration was categorized by three radiologists as follows: no/mild (Pfirrmann 1&2), moderate (Pfirrmann 3&4), and severe (Pfirrmann 5). Recall (sensitivity) and accuracy of DECT collagen maps were calculated. Intraclass correlation coefficient (ICC) was used to evaluate inter-reader reliability. Subjective evaluations were performed using 5-point Likert scales for diagnostic confidence and image quality.
Results: We evaluated a total of 762 intervertebral disks from 127 patients (median age, 69.7 (range, 23.0–93.7), female, 56). MRI identified 230 non/mildly degenerated disks (30.2%), 484 moderately degenerated disks (63.5%), and 48 severely degenerated disks (6.3%). DECT collagen maps yielded an overall accuracy of 85.5% (1955/2286). Recall (sensitivity) was 79.3% (547/690) for the detection of no/mild lumbar disk degeneration, 88.7% (1288/1452) for the detection of moderate disk degeneration, and 83.3% (120/144) for the detection of severe disk degeneration (ICC = 0.9). Subjective evaluations of DECT collagen maps showed high diagnostic confidence (median 4) and good image quality (median 4).
Conclusion: The use of DECT collagen maps to distinguish different stages of lumbar disk degeneration may have clinical significance in the early diagnosis of disk-related pathologies in patients with contraindications for MRI or in cases of unavailability of MRI.
Rationale and Objectives: Bone non-union is a serious complication of distal radius fractures (DRF) that can result in functional limitations and persistent pain. However, no accepted method has been established to identify patients at risk of developing bone non-union yet. This study aimed to compare various CT-derived metrics for bone mineral density (BMD) assessment to identify predictive values for the development of bone non-union.
Materials and Methods: CT images of 192 patients with DRFs who underwent unenhanced dual-energy CT (DECT) of the distal radius between 03/2016 and 12/2020 were retrospectively identified. Available follow-up imaging and medical health records were evaluated to determine the occurrence of bone non-union. DECT-based BMD, trabecular Hounsfield unit (HU), cortical HU and cortical thickness ratio were measured in normalized non-fractured segments of the distal radius.
Results: Patients who developed bone non-union were significantly older (median age 72 years vs. 54 years) and had a significantly lower DECT-based BMD (median 68.1 mg/cm3 vs. 94.6 mg/cm3, p < 0.001). Other metrics (cortical thickness ratio, cortical HU, trabecular HU) showed no significant differences. ROC and PR curve analyses confirmed the highest diagnostic accuracy for DECT-based BMD with an area under the curve (AUC) of 0.83 for the ROC curve and an AUC of 0.46 for the PR curve. In logistic regression models, DECT-based BMD was the sole metric significantly associated with bone non-union.
Conclusion: DECT-derived metrics can accurately predict bone non-union in patients who sustained DRF. The diagnostic performance of DECT-based BMD is superior to that of HU-based metrics and cortical thickness ratio.
We conducted a systematic review investigating the efficacy and tolerability of adrenocorticotropic hormone (ACTH) and corticosteroids in children with epilepsies other than infantile epileptic spasm syndrome (IESS) that are resistant to anti-seizure medication (ASM). We included retrospective and prospective studies reporting on more than five patients and with clear case definitions and descriptions of treatment and outcome measures. We searched multiple databases and registries, and we assessed the risk of bias in the selected studies using a questionnaire based on published templates. Results were summarized with meta-analyses that pooled logit-transformed proportions or rates. Subgroup analyses and univariable and multivariable meta-regressions were performed to examine the influence of covariates. We included 38 studies (2 controlled and 5 uncontrolled prospective; 31 retrospective) involving 1152 patients. Meta-analysis of aggregate data for the primary outcomes of seizure response and reduction of electroencephalography (EEG) spikes at the end of treatment yielded pooled proportions (PPs) of 0.60 (95% confidence interval [CI] 0.52–0.67) and 0.56 (95% CI 0.43–0.68). The relapse rate was high (PP 0.33, 95% CI 0.27–0.40). Group analyses and meta-regression showed a small benefit of ACTH and no difference between all other corticosteroids, a slightly better effect in electric status epilepticus in slow sleep (ESES) and a weaker effect in patients with cognitive impairment and “symptomatic” etiology. Obesity and Cushing's syndrome were the most common adverse effects, occurring more frequently in trials addressing continuous ACTH (PP 0.73, 95% CI 0.48–0.89) or corticosteroids (PP 0.72, 95% CI 0.54–0.85) than intermittent intravenous or oral corticosteroid administration (PP 0.05, 95% CI 0.02–0.10). The validity of these results is limited by the high risk of bias in most included studies and large heterogeneity among study results. This report was registered under International Prospective Register of Systematic Reviews (PROSPERO) number CRD42022313846. We received no financial support.
Key points
* Systematic review resulting in low to moderately solid evidence on the efficacy and tolerability of adrenocorticotropic hormone (ACTH) and corticosteroid treatment in children with epilepsy other than infantile spasms.
* Meta-analysis based on aggregate data from 2 controlled prospective, 5 uncontrolled prospective, and 31 retrospective studies.
* Pooled data showing a seizure response in 60% and electroencephalography (EEG) response in 56% of patients, with no major differences between drugs. However, 30%–40% of patients relapse after the cessation of treatment.
* The most frequent adverse effects are obesity and Cushing's syndrome, occurring in 70% of patients under continuous treatment for some weeks, but in less than 10% undergoing pulsed, intermittent regimens.
* More prospective, randomized-controlled studies are needed to improve the level of evidence and define the optimal doses and treatment duration.
Abstract
The co-occurrence of insulin resistance (IR)-related metabolic conditions with neuropsychiatric disorders is a complex public health challenge. Evidence of the genetic links between these phenotypes is emerging, but little is currently known about the genomic regions and biological functions that are involved. To address this, we performed Local Analysis of [co]Variant Association (LAVA) using large-scale (N=9,725-933,970) genome-wide association studies (GWASs) results for three IR-related conditions (type 2 diabetes mellitus, obesity, and metabolic syndrome) and nine neuropsychiatric disorders. Subsequently, positional and expression quantitative trait locus (eQTL)-based gene mapping and downstream functional genomic analyses were performed on the significant loci. Patterns of negative and positive local genetic correlations (|rg|=0.21-1, pFDR<0.05) were identified at 109 unique genomic regions across all phenotype pairs. Local correlations emerged even in the absence of global genetic correlations between IR-related conditions and Alzheimer’s disease, bipolar disorder, and Tourette’s syndrome. Genes mapped to the correlated regions showed enrichment in biological pathways integral to immune-inflammatory function, vesicle trafficking, insulin signalling, oxygen transport, and lipid metabolism. Colocalisation analyses further prioritised 10 genetically correlated regions for likely harbouring shared causal variants, displaying high deleterious or regulatory potential. These variants were found within or in close proximity to genes, such as SLC39A8 and HLA-DRB1, that can be targeted by supplements and already known drugs, including omega-3/6 fatty acids, immunomodulatory, antihypertensive, and cholesterol-lowering drugs. Overall, our findings underscore the complex genetic landscape of IR-neuropsychiatric multimorbidity, advocating for an integrated disease model and offering novel insights for research and treatment strategies in this domain.
Highlights
Local genetic correlations found even in the absence of global correlations.
Both positive and negative local correlations found for IR-neuropsychiatric pairs.
Enrichment for immune, and insulin signalling pathways, among others.
Pinpointed shared likely causal variants within 10 genomic regions.
Identified therapeutic targets, e.g., SLC39A8 and HLA-DRB1, for drug repurposing.
Background: Dual-energy CT (DECT)-derived bone mineral density (BMD) of the distal radius and other CT-derived metrics related to bone health have been suggested for opportunistic osteoporosis screening and risk evaluation for sustaining distal radius fractures (DRFs).
Methods: The distal radius of patients who underwent DECT between 01/2016 and 08/2021 was retrospectively analyzed. Cortical Hounsfield Unit (HU), trabecular HU, cortical thickness, and DECT-based BMD were acquired from a non-fractured, metaphyseal area in all examinations. Receiver-operating characteristic (ROC) analysis was conducted to determine the area under the curve (AUC) values for predicting DRFs based on DECT-derived BMD, HU values, and cortical thickness. Logistic regression models were then employed to assess the associations of these parameters with the occurrence of DRFs.
Results: In this study, 263 patients (median age: 52 years; interquartile range: 36–64; 132 women; 192 fractures) were included. ROC curve analysis revealed a higher area under the curve (AUC) value for DECT-derived BMD compared to cortical HU, trabecular HU, and cortical thickness (0.91 vs. 0.61, 0.64, and 0.69, respectively; p <.001). Logistic regression models confirmed the association between lower DECT-derived BMD and the occurrence of DRFs (Odds Ratio, 0.83; p <.001); however, no influence was observed for cortical HU, trabecular HU, or cortical thickness.
Conclusions: DECT can be used to assess the BMD of the distal radius without dedicated equipment such as calibration phantoms to increase the detection rates of osteoporosis and stratify the individual risk to sustain DRFs. In contrast, assessing HU-based values and cortical thickness does not provide clinical benefit.
Highlights
• Single nucleotide variants (SNVs) may affect transcription factor (TF) binding
• Fast statistical approach to assess significance of differential TF binding for SNVs
• Validate new approach on in vitro and in vivo TF binding assays
• Applications on GWAS SNVs and large eQTL studies illustrate utility
Summary
Non-coding variants located within regulatory elements may alter gene expression by modifying transcription factor (TF) binding sites, thereby leading to functional consequences. Different TF models are being used to assess the effect of DNA sequence variants, such as single nucleotide variants (SNVs). Often existing methods are slow and do not assess statistical significance of results. We investigated the distribution of absolute maximal differential TF binding scores for general computational models that affect TF binding. We find that a modified Laplace distribution can adequately approximate the empirical distributions. A benchmark on in vitro and in vivo datasets showed that our approach improves upon an existing method in terms of performance and speed. Applications on eQTLs and on a genome-wide association study illustrate the usefulness of our statistics by highlighting cell type-specific regulators and target genes. An implementation of our approach is freely available on GitHub and as bioconda package.
MicroRNAs (miRNAs) are critical post-transcriptional regulators in many biological processes. They act by guiding RNA-induced silencing complexes to miRNA response elements (MREs) in target mRNAs, inducing translational inhibition and/or mRNA degradation. Functional MREs are expected to predominantly occur in the 3’ untranslated region and involve perfect base-pairing of the miRNA seed. Here, we generate a high-resolution map of miR-181a/b-1 (miR-181) MREs to define the targeting rules of miR-181 in developing murine T-cells. By combining a multi-omics approach with computational high-resolution analyses, we uncover novel miR-181 targets and demonstrate that miR-181 acts predominantly through RNA destabilization. Importantly, we discover an alternative seed match and identify a distinct set of targets with repeat elements in the coding sequence which are targeted by miR-181 and mediate translational inhibition. In conclusion, deep profiling of MREs in primary cells is critical to expand physiologically relevant targetomes and establish context-dependent miRNA targeting rules.
Key Points:
* Deep profiling identifies novel targets of miR-181 associated with global gene regulation.
* miR-181 MREs in repeat elements in the coding sequence act through translational inhibition.
* High-resolution analysis reveals an alternative seed match in functional MREs.
Background: Novel treatments are needed to control refractory status epilepticus (SE). This study aimed to assess the potential effectiveness of fenfluramine (FFA) as an acute treatment option for SE. We present a summary of clinical cases where oral FFA was used in SE.
Methods: A case of an adult patient with Lennox–Gastaut syndrome (LGS) who was treated with FFA due to refractory SE is presented in detail. To identify studies that evaluated the use of FFA in SE, we performed a systematic literature search.
Results: Four case reports on the acute treatment with FFA of SE in children and adults with Dravet syndrome (DS) and LGS were available. We report in detail a 30-year-old woman with LGS of structural etiology, who presented with generalized tonic and dialeptic seizures manifesting at high frequencies without a return to clinical baseline constituting the diagnosis of SE. Treatment with anti-seizure medications up to lacosamide 600 mg/d, brivaracetam 300 mg/d, valproate 1,600 mg/d, and various benzodiazepines did not resolve the SE. Due to ongoing refractory SE and following an unremarkable echocardiography, treatment was initiated with FFA, with an initial dose of 10 mg/d (0.22 mg/kg body weight [bw]) and fast up-titration to 26 mg/d (0.58 mg/kg bw) within 10 days. Subsequently, the patient experienced a resolution of SE within 4 days, accompanied by a notable improvement in clinical presentation and regaining her mobility, walking with the assistance of physiotherapists. In the three cases reported in the literature, DS patients with SE were treated with FFA, and a cessation of SE was observed within a few days. No treatment-emergent adverse events were observed during FFA treatment in any of the four cases.
Conclusions: Based on the reported cases, FFA might be a promising option for the acute treatment of SE in patients with DS and LGS. Observational data show a decreased SE frequency while on FFA, suggesting a potentially preventive role of FFA in these populations.
Key points
* We summarize four cases of refractory status epilepticus (SE) successfully treated with fenfluramine.
* Refractory SE resolved after 4–7 days on fenfluramine.
* Swift fenfluramine up-titration was well-tolerated during SE treatment.
* Treatment-emergent adverse events on fenfluramine were not observed.
* Fenfluramine might be a valuable acute treatment option for SE in Dravet and Lennox–Gastaut syndromes.
Upon infection, human immunodeficiency virus (HIV-1) releases its cone-shaped capsid into the cytoplasm of infected T-cells and macrophages. As its largest known cargo, the capsid enters the nuclear pore complex (NPC), driven by interactions with numerous FG-repeat nucleoporins (FG-Nups). Whether NPCs structurally adapt to capsid passage and whether capsids are modified during passage remains unknown, however. Here, we combined super-resolution and correlative microscopy with cryo electron tomography and molecular simulations to study nuclear entry of HIV-1 capsids in primary human macrophages. We found that cytosolically bound cyclophilin A is stripped off capsids entering the NPC, and the capsid hexagonal lattice remains largely intact inside and beyond the central channel. Strikingly, the NPC scaffold rings frequently crack during capsid passage, consistent with computer simulations indicating the need for NPC widening. The unique cone shape of the HIV-1 capsid facilitates its entry into NPCs and helps to crack their rings.
Inner world and milieu : art, madness, and Brazilian psychiatry in the work of Nise da Silveira
(2024)
This short essay focuses on the work of Brazilian doctor Nise da Silveira, a pioneer in psychiatry who introduced artistic tools to work with psychiatric patients, especially those diagnosed as psychotic. She founded the Museum of Images from the Unconscious in 1952 inside an asylum in Rio de Janeiro to assemble and exhibit the works produced by her patients. As an iconoclast who did not systematize her theory, she engaged with several European psychiatrists, psychoanalysts, and thinkers to produce a very innovative reflection and practical clinical work. Her work resonates in particular with French Institutional Psychotherapy, as well as with Frantz Fanon's psychiatric work in Algeria, but, differently from the former, places art at the core of its clinical method and proposes a radical positioning against every form of medicalized approach.
Background: The Association of the Scientific Medical Societies in Germany (AWMF) clinical practice guideline on cochlear implant (CI) treatment, which was updated in 2020, defined the entire process of CI care for the first time. In the present study, the feasibility and results of very early rehabilitation were examined.
Materials and methods: The intervention group (IG) comprised 54 patients in whom rehabilitation was initiated within 14 (maximally 28) days after implantation. Patients with a significantly longer waiting time were included in the control group (CG, n = 21). In addition to the start and duration of rehabilitation, the speech intelligibility achieved with CI was recorded at different timepoints within a 12-month period. In addition, questionnaires were used to assess the effort of fitting the CI processor and the patients’ satisfaction with the outcome as well as the timing of the start of rehabilitation.
Results: Median waiting time between implantation and start of rehabilitation was 14 days in the IG and 106 days in the CG; 92.6% of IG patients were able to start rehabilitation within 14 days. The effect of rehabilitation in the IG was 35 and in the CG 25 percentage points (Freiburg monosyllabic test). After 6 and 12 months of CI use, both groups showed comparable results in the test condition in quiet (IG/CG 6 months: 70%/70%; 12 months: 70%/60%, Freiburg monosyllabic test) and in noise (IG/CG 6 months: −1.1 dB SNR/–0.85 dB SNR; 12 months: −0.65 dB SNR/+0.3 dB SNR, Oldenburg sentence test). Hearing quality assessment scores collected by SSQ (Speech, Spatial and Qualities of Hearing Scale) questionnaire showed better scores in the IG at 6 months, which converged to CG scores at 12 months. The IG was significantly more satisfied with the timing of the start of rehab than the CG. All other data obtained from questionnaires showed no differences between the two groups.
Conclusion: A very early start of inpatient rehabilitation after cochlear implantation was successfully implemented. The rehabilitation was completed within 7 weeks of CI surgery. Comparison of speech recognition test results before and after rehabilitation showed a significant improvement. A clear rehabilitation effect can therefore be demonstrated. Inclusion of CI rehabilitation in the German catalog of follow-up treatments is thus scientifically justified and therefore strongly recommended.
There has been a growing awareness of the need for scientific research to focus on somatic and mental comorbidities in recent years due to the emerging evidence showing their substantial overlap at numerous levels. In this special issue, initiated by members of the EU-funded PRIME consortium (“Prevention and Remediation of Insulin Multimorbidity in Europe; www.prime-study.eu), the focus is on the comorbidities of metabolic disturbances, especially related to insulin signalling dysregulation and mental and neurological disorders. Thus, while obesity, type 2 diabetes, and metabolic syndrome are commonly known to be insulin-related disorders, the last decades have shown that neurodegenerative disorders, such as Alzheimer’s disease, as well as neurodevelopment disorders, such as obsessive-compulsive disorder (OCD), autism spectrum disorders (ASDs) and attention deficit / hyperactivity disorder (ADHD) also fall into this category. The special issue draws together a series of basic and clinical review articles that describe the current knowledge and future perspectives regarding insulin comorbidities across a multidisciplinary group of experts
The lipid content of skin plays a determinant role in its barrier function with a particularly important role attributed to linoleic acid and its derivatives. Here we explored the consequences of interfering with the soluble epoxide hydrolase (sEH) on skin homeostasis. sEH; which converts fatty acid epoxides generated by cytochrome P450 enzymes to their corresponding diols, was largely restricted to the epidermis which was enriched in sEH-generated diols. Global deletion of the sEH increased levels of epoxides, including the linoleic acid-derived epoxide; 12,13-epoxyoctadecenoic acid (12,13-EpOME), and increased basal keratinocyte proliferation. sEH deletion (sEH-/- mice) resulted in thicker differentiated spinous and corneocyte layers compared to wild-type mice, a hyperkeratosis phenotype that was reproduced in wild-type mice treated with a sEH inhibitor. sEH deletion made the skin sensitive to inflammation and sEH-/- mice developed thicker imiquimod-induced psoriasis plaques than the control group and were more prone to inflammation triggered by mechanical stress with pronounced infiltration and activation of neutrophils as well as vascular leak and increased 12,13-EpOME and leukotriene (LT) B4 levels. Topical treatment of LTB4 antagonist after stripping successfully inhibited inflammation and neutrophil infiltration both in wild type and sEH-/- skin. While 12,13-EpoME had no effect on the trans-endothelial migration of neutrophils, like LTB4, it effectively induced neutrophil adhesion and activation. These observations indicate that while the increased accumulation of neutrophils in sEH-deficient skin could be attributed to the increase in LTB4 levels, both 12,13-EpOME and LTB4 contribute to neutrophil activation. Our observations identify a protective role of the sEH in the skin and should be taken into account when designing future clinical trials with sEH inhibitors.
Highlights
• Deletion of SPPL3 promotes resistance of malignant B cells to NK cell cytotoxicity
• Loss of SPPL3 blocks ligand binding to NK receptors via increased N-glycosylation
• B3GNT2 deletion reduces LacNAc addition and restores SPPL3-KO cell sensitivity to NK cells
• SPPL3-deficient cells are enriched in tetra-antennary N-glycans with LacNAc elongations
Summary
Natural killer (NK) cells are primary defenders against cancer precursors, but cancer cells can persist by evading immune surveillance. To investigate the genetic mechanisms underlying this evasion, we perform a genome-wide CRISPR screen using B lymphoblastoid cells. SPPL3, a peptidase that cleaves glycosyltransferases in the Golgi, emerges as a top hit facilitating evasion from NK cytotoxicity. SPPL3-deleted cells accumulate glycosyltransferases and complex N-glycans, disrupting not only binding of ligands to NK receptors but also binding of rituximab, a CD20 antibody approved for treating B cell cancers. Notably, inhibiting N-glycan maturation restores receptor binding and sensitivity to NK cells. A secondary CRISPR screen in SPPL3-deficient cells identifies B3GNT2, a transferase-mediating poly-LacNAc extension, as crucial for resistance. Mass spectrometry confirms enrichment of N-glycans bearing poly-LacNAc upon SPPL3 loss. Collectively, our study shows the essential role of SPPL3 and poly-LacNAc in cancer immune evasion, suggesting a promising target for cancer treatment.
Biological drug substance (DS) is typically stored frozen to increase stability. However, freezing and thawing (F/T) of DS can impact product quality and therefore F/T processes need to be controlled. Because active F/T systems for DS bottles are lacking, freezing is often performed uncontrolled in conventional freezers, and thawing at ambient temperature or using water baths.
In this study, we evaluated a novel device for F/T of DS in bottles, which can be operated in conventional freezers, generating a directed air stream around bottles. We characterized the F/T geometry and process performance in comparison to passive F/T using temperature mapping and analysis of concentration gradients. The device was able to better control the F/T process by inducing directional bottom-up F/T. As a result, it reduced cryo-concentration during freezing as well as ice mound formation. However, freezing with the device was dependent on freezer performance, i.e. prolonged process times in a highly loaded freezer were accompanied by increased cryo-concentrations. Thawing was faster compared to without the device, but had no impact on concentration gradients and was slower compared to thawing in a water bath.
High-performance freezers might be required to fully exploit the potential of directional freezing with this device and allow F/T process harmonization and scaling across sites.
Wissenschaftsbasierte und verständliche Gesundheitsinformationen sind ein Kernelement der Evidenzbasierten Medizin und von Public Health. Ziel ist es, informierte Entscheidungen zu ermöglichen, die auf realistischen Einschätzungen von Gesundheitsrisiken sowie von Nutzen und Schaden möglicher Interventionen beruhen. In Deutschland wurden während der COVID-19-Pandemie die Standards für eine evidenzbasierte Risikokommunikation wenig beachtet. Häufig war die öffentliche Berichterstattung einseitig, unvollständig und missverständlich. Bedrohungsszenarien haben emotionalen Stress und unnötige Angst ausgelöst. Eine systematische und umfassende Aufarbeitung der Pandemiemaßnahmen ist auch in Deutschland dringlich geboten. Dabei müsste eine kritisch-konstruktive Analyse der medialen Risikokommunikation von Expert*innen, Politiker*innen und Medien ein zentrales Element der Aufarbeitung sein. Die Ergebnisse sollen helfen, aus der vergangenen Pandemie zu lernen, um für künftige Krisen besser vorbereitet zu sein.
Purpose: The IC-8® Apthera™ (AcuFocus Inc.™, Irvine, California, USA) is the first small aperture intraocular lens (IOL) to receive FDA approval for presbyopia correction in the summer of 2022. It is a single-piece hydrophobic acrylic monofocal lens, which is placed in the capsular bag. In its center it carries a black circular mask (FilterRing™) with a diameter of 3.23 mm consisting of polyvinylidene fluoride and carbon black nanoparticles. In the center of this mask sits a 1.36 mm wide aperture. Thanks to this pinhole effect the IC-8® serves as an extended-depth-of-focus (EDOF) IOL and can be used in presbyopia correction.
This report describes the case of a patient with an IC-8® implant who underwent Nd:YAG laser capsulotomy for posterior capsule opacification (PCO). The post laser checkup showed a dark central optical change within the IOL and the patient described optical phenomena as well as blurred central vision, which is why he received IOL exchange. The explanted IC-8® was sent to the Intermountain Ocular Research Center at the University of Utah for further analysis.
Observations: A 56-year-old male underwent cataract surgery with implantation of a non-diffractive EDOF-IOL on the right and the IC-8® small aperture IOL on the left eye. On the left eye, the patient had received penetrating keratoplasty seven years prior to the cataract operation due to posttraumatic corneal scarring. The early checkups after cataract surgery showed a corrected distance visual acuity (CDVA) in the left eye of +0.1 logMAR in the first month. About 5 months after the operation, PCO was first described on the left eye leading to a decrease in visual acuity to +0.4 logMAR (CDVA). Due to PCO, Nd:YAG laser capsulotomy was conducted 5 months after the cataract operation on the left eye. 12 shots were applied at 2.7 mJ. The following appointments showed a continuously reduced visual acuity of +1.3 logMAR (uncorrected) on the left eye and the patient described blurry and ‘swirled’ central vision. By slightly tilting his head and thus not using the center of his optic axis, he would be able to see sharper. Slit lamp examination showed a small optical change inside the IC-8® IOL not resembling a pit but believed to be a small pocket of air. Due to the ongoing symptoms as well as the reduced VA, the seemingly damaged small aperture IOL was exchanged for a three-piece hydrophobic acrylic monofocal lens, which was also placed in the posterior chamber. The explanted IC-8® was sent to the Intermountain Ocular Research Center at the University of Utah for further analysis. Results from gross and light microscopic analysis showed that the change caused by the Nd:YAG laser application consisted of a localized optical area containing carbon black nanoparticles used for the circular mask within the IOL.
Conclusions and importance: When dealing with PCO and performing Nd:YAG laser capsulotomy in eyes with an IC-8® IOL implant, the laser shots should be applied either inside the aperture or outside of the black circular mask of the IOL. Otherwise, the Nd:YAG laser can lead to bursts of carbon nanoparticles within the IOL which may cause optical phenomena as well as decreased visual acuity possibly resulting in an IOL exchange.
Highlights
• Piriform cortex and amgydala can be separated based on their distinct structural connectivity.
• Similar to histological findings, the connectivity of the piriform cortex suggests posterior frontal and temporal subregions.
• Subregions of the piriform cortex have distinct connectivity profiles.
• Anterior PC extended into ventrotemporal PC posteriorly, which has not been described before, requiring further investigation.
• All parcellations were made publicly available.
Abstract
The anatomy of the human piriform cortex (PC) is poorly understood. We used a bimodal connectivity-based-parcellation approach to investigate subregions of the PC and its connectional differentiation from the amygdala.
One hundred (55 % female) genetically unrelated subjects from the Human Connectome Project were included. A region of interest (ROI) was delineated bilaterally covering PC and amygdala, and functional and structural connectivity of this ROI with the whole gray matter was computed. Spectral clustering was performed to obtain bilateral parcellations at granularities of k = 2–10 clusters and combined bimodal parcellations were computed. Validity of parcellations was assessed via their mean individual-to-group similarity per adjusted rand index (ARI).
Individual-to-group similarity was higher than chance in both modalities and in all clustering solutions. The amygdala was clearly distinguished from PC in structural parcellations, and olfactory amygdala was connectionally more similar to amygdala than to PC. At higher granularities, an anterior and ventrotemporal and a posterior frontal cluster emerged within PC, as well as an additional temporal cluster at their boundary. Functional parcellations also showed a frontal piriform cluster, and similar temporal clusters were observed with less consistency. Results from bimodal parcellations were similar to the structural parcellations. Consistent results were obtained in a validation cohort.
Distinction of the human PC from the amygdala, including its olfactory subregions, is possible based on its structural connectivity alone. The canonical fronto-temporal boundary within PC was reproduced in both modalities and with consistency. All obtained parcellations are freely available.
Key Teaching Points
• Wearables such as smartwatches can monitor beyond heart rate and heart rhythm.
• Specific smartwatches provide reliable measurements of electrocardiographic intervals (eg, QT interval).
• Correct analysis and interpretation of the QT interval in an individual with previously unknown long QT syndrome facilitated the diagnosis.
Hematopoietic mutations in epigenetic regulators like DNA methyltransferase 3 alpha (DNMT3A), play a pivotal role in driving clonal hematopoiesis of indeterminate potential (CHIP), and are associated with unfavorable outcomes in patients suffering from heart failure (HF). However, the precise interactions between CHIP-mutated cells and other cardiac cell types remain unknown. Here, we identify fibroblasts as potential partners in interactions with CHIP-mutated monocytes. We used combined transcriptomic data derived from peripheral blood mononuclear cells of HF patients, both with and without CHIP, and cardiac tissue. We demonstrate that inactivation of DNMT3A in macrophages intensifies interactions with cardiac fibroblasts and increases cardiac fibrosis. DNMT3A inactivation amplifies the release of heparin-binding epidermal growth factor-like growth factor, thereby facilitating activation of cardiac fibroblasts. These findings identify a potential pathway of DNMT3A CHIP-driver mutations to the initiation and progression of HF and may also provide a compelling basis for the development of innovative anti-fibrotic strategies.
Tight control over transcription factor activity is necessary for a sensible balance between cellular proliferation and differentiation in the embryo and during tissue homeostasis by adult stem cells, but mechanistic details have remained incomplete. The homeodomain transcription factor MEIS2 is an important regulator of neurogenesis in the ventricular–subventricular zone (V-SVZ) adult stem cell niche in mice. We here identify MEIS2 as direct target of the intracellular protease calpain-2 (composed of the catalytic subunit CAPN2 and the regulatory subunit CAPNS1). Phosphorylation at conserved serine and/or threonine residues, or dimerization with PBX1, reduced the sensitivity of MEIS2 towards cleavage by calpain-2. In the adult V-SVZ, calpain-2 activity is high in stem and progenitor cells, but rapidly declines during neuronal differentiation, which is accompanied by increased stability of MEIS2 full-length protein. In accordance with this, blocking calpain-2 activity in stem and progenitor cells, or overexpression of a cleavage-insensitive form of MEIS2, increased the production of neurons, whereas overexpression of a catalytically active CAPN2 reduced it. Collectively, our results support a key role for calpain-2 in controlling the output of adult V-SVZ neural stem and progenitor cells through cleavage of the neuronal fate determinant MEIS2.
Highlights
• Reduced evoked theta activity in the deaf.
• Reduced theta-gamma and alpha-gamma cross-frequency couplings in the deaf.
• Stronger delta-alpha coupling in the deaf.
Abstract
Neurons within a neuronal network can be grouped by bottom-up and top-down influences using synchrony in neuronal oscillations. This creates the representation of perceptual objects from sensory features. Oscillatory activity can be differentiated into stimulus-phase-locked (evoked) and non-phase-locked (induced). The former is mainly determined by sensory input, the latter by higher-level (cortical) processing. Effects of auditory deprivation on cortical oscillations have been studied in congenitally deaf cats (CDCs) using cochlear implant (CI) stimulation. CI-induced alpha, beta, and gamma activity were compromised in the auditory cortex of CDCs. Furthermore, top-down information flow between secondary and primary auditory areas in hearing cats, conveyed by induced alpha oscillations, was lost in CDCs. Here we used the matching pursuit algorithm to assess components of such oscillatory activity in local field potentials recorded in primary field A1. Additionally to the loss of induced alpha oscillations, we also found a loss of evoked theta activity in CDCs. The loss of theta and alpha activity in CDCs can be directly related to reduced high-frequency (gamma-band) activity due to cross-frequency coupling. Here we quantified such cross-frequency coupling in adult 1) hearing-experienced, acoustically stimulated cats (aHCs), 2) hearing-experienced cats following acute pharmacological deafening and subsequent CIs, thus in electrically stimulated cats (eHCs), and 3) electrically stimulated CDCs. We found significant cross-frequency coupling in all animal groups in > 70% of auditory-responsive sites. The predominant coupling in aHCs and eHCs was between theta/alpha phase and gamma power. In CDCs such coupling was lost and replaced by alpha oscillations coupling to delta/theta phase. Thus, alpha/theta oscillations synchronize high-frequency gamma activity only in hearing-experienced cats. The absence of induced alpha and theta oscillations contributes to the loss of induced gamma power in CDCs, thereby signifying impaired local network activity.
The human immune system is determined by the functionality of the human lymph node. With the use of high-throughput techniques in clinical diagnostics, a large number of data is currently collected. The new data on the spatiotemporal organization of cells offers new possibilities to build a mathematical model of the human lymph node - a virtual lymph node. The virtual lymph node can be applied to simulate drug responses and may be used in clinical diagnosis. Here, we review mathematical models of the human lymph node from the viewpoint of cellular processes. Starting with classical methods, such as systems of differential equations, we discuss the values of different levels of abstraction and methods in the range from artificial intelligence techniques formalism.
Hintergrund: Bei der Operation einer ATAD sind Patienten aufgrund multipler komplexer Faktoren gefährdet perioperative permanente neurologische Defizite zu erleiden. Da perioperative PND die Mortalität signifikant steigern, ist die Kenntnis über potentielle Risikofaktoren für ein PND von großem Wert, nicht zuletzt um bestmöglich auf jeden Patientenfall vorbereitet sein zu können und Therapiestrategien zu optimieren.
Diese retrospektive Studie soll prä- und intraoperative Risikofaktoren für die Entstehung eines PND nach der Operation einer ATAD herausfiltern.
Material und Methoden: Patientendaten von Patienten mit ATAD (n=305), die sich im Zeitraum von 2001 – 2017 am Universitätsklinikum Frankfurt in der Abteilung für Herz- und Gefäßchirurgie einer Operation unterzogen haben, wurden retrospektiv mittels univariater Analyse und multivariater logistischer Regression analysiert.
Ergebnisse: Die PND-Rate innerhalb der Studienpopulation betrug 13%. Mit hoher statistischer Signifikanz konnte eine Form der hämodynamischen Instabilität als präoperativer Risikofaktor für die Entstehung eines perioperativen PND identifiziert werden (OR 9,53; p<0.001). Weiterhin konnte gezeigt werden, dass das Vorhandensein einer Karotisstenose das perioperative PND-Risiko ungünstig beeinflusst (OR 2,68, p=0,04). Ein präoperativer Sinusrhythmus kann die perioperative PND-Rate günstig beeinflussen (OR 0,2, p=0,01). Die univariate Analyse konnte signifikant belegen, dass Operationszeiten > 300 Minuten und EKZ-Zeiten > 160 Minuten das PND-Risiko ungünstig beeinflussen. Andere Risikofaktoren wie z.B. die Art der Hirnperfusion oder der Grad des hypothermischen Kreislausstillstandes, die zumindest klinische Signifikanz zu haben scheinen, konnten in dieser Arbeit keine statistische Signifikanz erzielen, was ggf. Ausdruck der Limitationen retrospektiver Arbeiten ist.
Fazit: Eine hämodynamische Instabilität stellt einen präoperativen Risikofaktor für die Entstehung eines PND nach der Operation einer ATAD dar. Zu den identifizierten präoperativen Risikofaktoren, die die PND-Rate ungünstig beeinflussen gehört außerdem das Vorhandensein einer Karotisstenose, während das Vorhandensein eines Sinusrhythmus die PND-Rate günstig beeinflusst.
Das Zeitmanagement bei der Operation einer ATAD ist entscheidend, um peri-operativen PND vorbeugen zu können. Eine Operationszeit > 300 Minuten und eine EKZ-Zeit von > 160 Minuten sind mit wesentlich höheren PND-Raten assoziiert und stellen somit intraoperative Risikofaktorenfür die Entstehung eines PND bei der Operation einer ATAD dar.
Evidence-based and comprehensible health information is a key element of evidence-based medicine and public health. The goal is informed decision-making based on realistic estimations of health risks and accurate expectations about benefits and harms of interventions. In Germany, standards of evidence-based risk information were poorly followed during the COVID-19 pandemic. Frequently, public information was biased, fragmentary and misleading. Pandemic-related threat scenarios induced emotional distress and unnecessary anxiety. A systematic and comprehensive evaluation of the pandemic measures is crucial, but still pending in Germany. A critical analysis of risk communication by experts, politicians and the media during the pandemic should be a key element of the evaluation process. Evaluation of decision making and media reporting during the pandemic should improve preparedness for future crises.
Diese Arbeit hatte das Ziel, die Größe einer DVT-Aufnahme (FOV) mit der Größe der durch die Indikationsstellung definierten Region (ROI) zu vergleichen. Durch eine speziell dafür entwickelte Software sollten Messungen in den Datensätzen ermöglicht werden. Die dazu verwendeten 332 Datensätze wurden zufallsverteilt aus den mit einem Orthophos SL-3D DVT-Gerät der Firma Dentsply Sirona in der Poliklinik für zahnärztliche Chirurgie und Implantologie des ZZMK (Carolinum) in Frankfurt angefertigten Röntgenaufnahmen selektiert.
Es wurde die Auswertungssoftware ExRoi entwickelt, mit der die Werte des axialen Durchmessers, die Höhe (vertikale Dimension) sowie die Distanz der Mittelpunkte von FOV und ROI direkt in den Datensätzen bestimmt werden konnten. Zusätzlich wurde festgehalten, welche rechtfertigenden Indikationen gestellt und welche Auflösungsmodi verwendet wurden.
Die Stichprobe bestand aus Aufnahmen mit einem axialen Durchmesser von 8 cm [VOL 1] (n= 76, entsprechend 46,39%), 5 cm Durchmesser [VOL 2] (n = 102, entsprechend 30,72%) und 11 cm Durchmesser [VOL 3] (n= 154, entsprechend 22,89%). 95,18% der Aufnahmen wurden im HD-Modus mit laut Herstellerangaben vier Mal so vielen Aufnahmen im Vergleich zum SD-Modus angefertigt. Hauptindikationen waren Implantat Planung (45,1%) und Planungen komplizierter Zahn-Extraktionen (25,5%).
Die Messungen zum Vergleich des axialen Durchmessers zeigten, dass bei Verwendung des VOL 2 die ROI im Mittel den größten Anteil der FOV nutzt (78,52 %), den kleinsten Anteil nutzt durchschnittlich VOL 1 (56,04 %). Dazwischen liegt VOL 3 (69,12 %). In der Vertikalen nutzt die ROI von VOL 3 mittelwertig den größten Anteil der FOV (81,87 %), den kleinsten Mittelwert hat VOL 1 (58,76 %). VOL 2 liegt zwischen diesen Werten (64,47 %).
In allen Fällen war das FOV größer als die ROI und die ROI lag im Bereich des gewählten FOV.
Die Mittelpunkte von FOV und ROI lagen im Mittel in der axialen Ebene in Abhängigkeit vom gewählten Volumen um rund 9-13 mm auseinander, in der coronalen und sagittalen Ebene um rund 5-6mm.
Aus diesen Ergebnissen kann für das verwendete Gerät eine gute Trefferquote für die ROI abgeleitet werden. Höhe und Durchmesser des FOV hätten in den meisten Fällen kleiner gewählt werden können, liegen aber angesichts der vorhandenen Auswahl-Optionen des Röntgengeräts zur Dimensionierung der Volumina in einem akzeptablen Bereich.
Der Natrium-abhängige Kaliumkanal Slack (KNa1.1, Slo2.2, KCNT1) nimmt eine Schlüsselrolle in der Regulation neuronaler Erregbarkeit ein, indem er die Ausbildung und Feuerungsfrequenz von Aktionspotentialen kontrolliert. Sowohl in Mäusen als auch in Menschen wird Slack besonders hoch in nicht-peptidergen C-Faser-Neuronen exprimiert. Wissenschaftliche Erkenntnisse der letzten Jahre konnten die Beteiligung von Slack-Kanälen in der Signalverarbeitung neuropathischer Schmerzen, aber auch in verschiedenen Arten von Pruritus, feststellen. Dabei zeigen Slack-defiziente Mäuse ein verstärktes mechanisches Schmerzverhalten nach einer peripheren Nervenverletzung und ein erhöhtes Kratzverhalten in akuten Juckreiz-Modellen. Das als Slack-Aktivator identifizierte trizyklische Neuroleptikum Loxapin zeigt sowohl analgetische als auch antipruritische Effekte in Mäusen, jedoch ist sein klinischer Einsatz auf Grund schwerwiegender antipsychotischer Nebenwirkungen limitiert. Basierend auf Loxapins Leitstruktur wurden daher in dieser Arbeit neue Slack-Aktivatoren mit einem verbesserten pharmakologischen Profil designed und ihr Potential für die Therapie von Schmerzen sowie akutem und chronischem Pruritus in vivo untersucht.
Das Schilddrüsenkarzinom (SK) ist die häufigste bösartige endokrine Tumorerkrankung. Während das nicht-metastasierte und nicht-mutierte papilläre Schilddrüsenkarzinom (PSK) und das follikuläre Schilddrüsenkarzinom (FSK) eine gute Heilungschance aufweisen, zeigen die mutierten und metastasierten Varianten des PSK und FSK sowie das anaplastische Schilddrüsenkarzinom (ASK) weiterhin eine schlechte Prognose. Die Entwicklung von Therapieresistenzen stellen hierbei ein Hauptproblem in der Behandlung des fortgeschrittenen Schilddrüsenkarzinoms dar.
In den letzten Jahren wurden in Studien zunehmend Tumor-initiierende Zellen (TIZ) beschrieben, welche eine kleine Subpopulation von Zellen mit der Fähigkeit zur Selbsterneuerung, Tumorinitiierung und Entwicklung von Therapieresistenzen von Tumoren darstellen. Die Existenz von TIZ wurde auch im SK nachgewiesen. Ein entscheidender Faktor für die Persistenz von TIZ ist die Hypoxie, welche über eine Veränderung des Tumormikromilieus und des Zellmetabolismus zur Entstehung von Therapieresistenzen beiträgt. Ein durch Hypoxie hochreguliertes Enzym ist die Carboanhydrase IX (CAIX). CAIX wird hauptsächlich von Tumorzellen exprimiert und katalysiert die Reaktion von Kohlendioxid zu Bicarbonat und einem Proton und trägt damit zur Säurepufferung der Tumorzelle bei. CAIX stellt somit einen entscheidenden Faktor für das Überleben von Tumorzellen in einem hypoxischen Milieu dar. Des Weiteren ist eine erhöhte Expression von CAIX mit einem schlechten Patienten-Outcome assoziiert, wie z.B. im Brustkrebs. Diese Eigenschaften machen CAIX zu einem attraktiven Angriffspunkt einer zielgerichteten Tumortherapie. Die vorliegende Studie hat zum Ziel, die Expression von CAIX sowie dessen biologische Rolle im Schilddrüsenkarzinom näher zu untersuchen.
Hierzu wurden Proben von 114 SK-Patienten immunhistochemisch auf eine CAIX-Expression untersucht und mit tumorfreiem Schilddrüsengewebe verglichen. Hierbei waren unterschiedliche SK-Subtypen vertreten. Für eine weitere Validierung der Expressionsdaten erfolgte die Auswertung eines Datasets von „The Cancer Genome Atlas“ (TCGA) mithilfe von cBioportal. Da die Hypoxie ein wichtiger Faktor für die Persistenz von TIZ ist, wurde die CAIX-Expression in Tumorsphären, ein in vitro Nachweis von TIZ-Aktivität, mittels der Durchflusszytometrie bestimmt und mit der CAIX-Expression von Monolayern verglichen. Als SK-Zelllinien wurden BCPAP (PSK), FTC 133 (FSK) und 8505 C (ASK) verwendet. Anschließend wurde mithilfe der Polymerasekettenreaktion und Immunofluoreszenzfärbung untersucht, ob eine CAIX-Expression in den Tumorsphären mit der Expression von bereits bekannten Stammzellmarkern, u.a. NANOG, assoziiert ist. Die Unterschiede der CAIX-Expression, nach Inkubation der Monolayer jeweils in Normoxie und Hypoxie, wurden mittels Durchflusszytometrie bestimmt. Mithilfe eines genetischen CAIX-Knockdowns sowie einer pharmakologischen Inhibition mit dem CAIX-Inhibitor Methazolamid (MZM) wurde die Tumorzellproliferation und -Sphärenbildung unter Normoxie und Hypoxie bestimmt. Zusätzlich wurde der Einfluss von MZM auf die Apoptose und den Zellzyklus untersucht.
Immunhistochemische Färbungen der Gewebeproben von SK-Patienten zeigten, dass die CAIX-Expression sowohl im PSK und FSK als auch im ASK im Vergleich zum tumorfreien Schilddrüsengewebe erhöht war. Des Weiteren zeigte die klinisch-pathologische Datenanalyse, dass eine erhöhte CAIX-Expression mit dem Auftreten von Lymphknotenmetastasen im differenzierten SK assoziiert war. Auch die Analyse des TCGA-Datasets bestätigte, dass eine erhöhte Expression der CAIX-mRNA mit einem fortgeschrittenen Tumorstadium, Fernmetastasen und mit einem kürzeren Gesamt-Überleben von SK-Patienten korrelierte. Die weiteren funktionellen in vitro Untersuchungen ergaben, dass die CAIX-Expression in den Tumorsphären im Vergleich zu Monolayern erhöht und mit einer erhöhten Expression von Stammzellmarkern assoziiert war. Ein genetischer CAIX-Knockdown und eine CAIX-Inhibition mit MZM führten über eine Induktion der Apoptose und eines Zellzyklusarrests zu einer verminderten Tumorzellproliferation und Sphärenbildung.
Zusammenfassend deuten die Ergebnisse darauf hin, dass CAIX ein vielversprechendes Zielmolekül für eine gezielte Tumortherapie des fortgeschrittenen SK ist. Um diese Hypothese bestätigen zu können, sind jedoch weitere prospektive Analysen von Patientenproben sowie funktionelle in vivo Untersuchungen am SK nötig.
Memory consolidation tends to be less robust in childhood than adulthood. However, little is known about the corresponding functional differences in the developing brain that may underlie age-related differences in retention of memories over time. This study examined system-level memory consolidation of object-scene associations after learning (immediate delay), one night of sleep (short delay), as well as two weeks (long delay) in 5-to-7-year-old children (n = 49) and in young adults (n = 39), as a reference group with mature consolidation systems. Particularly, we characterized how functional neural activation and reinstatement of neural patterns change over time, assessed by functional magnetic resonance imaging combined with representational similarity analysis (RSA). Our results showed that memory consolidation in children was less robust and strong (i.e., more forgetting) compared to young adults. Contrasting correctly retained remote versus recent memories across time delay, children showed less upregulation in posterior parahippocampal gyrus, lateral occipital cortex, and cerebellum than adults. In addition, both children and adults showed decrease in scene-specific neural reinstatement over time, indicating time-related decay of detailed differentiated memories. At the same time, we observed more generic gist-like neural reinstatement in medial-temporal and prefrontal brain regions uniquely in children, indicating qualitative difference in memory trace in children. Taken together, 5-to-7-year-old children, compared to young adults, show less robust memory consolidation, possibly due to difficulties in engaging in differentiated neural reinstatement in neocortical mnemonic regions during retrieval of remote memories, coupled with relying more on gist-like generic neural reinstatement.
The hepatitis B virus is one of the most common causes of virus-related chronic liver disease and remains a major global health problem affecting 296 million people worldwide. Despite an available and highly effective vaccination, hepatitis B infections lead to an annual mortality rate of approximately 0.8 million people. The global prevalence is heterogeneously distributed and reflects a high infections and chronicity, particularly in low-income countries, due to a lack of vaccination strategies, underdiagnosis and low treatment rates. A complete cure remains undiscovered to this day. Based on their genetic makeup, the virus is categorized into nine genotypes with a genetic difference of more than 8% within the sequence. In addition to their geographical distribution, hepatitis B virus genotypes also differ in terms of their clinical outcome, pathogenesis and treatment response.
The viral protein HBx is known to interact with several cellular signaling pathways and is thereby accounted as the driving force in the development of hepatitis B virus-associated pathogenesis and progression of hepatocellular carcinoma. In particular, HBx interacts with mitochondria and induces profound alterations in the mitochondrial morphology and function with a severe impact on the liver’s physiology and with an emerging role in liver-related disease progression.
This study aims to investigate the genotype-related impact of HBx with regard to their interaction with cellular signaling pathways. A particular focus was placed on mitochondria-dependent interactions and signaling pathways in order to broaden the understanding of the genetic diversity of the genotypes.
Differences between genotypes of HBx were examined and compared through in vitro experiments based on a cell culture-based system. Plasmid DNA encoding the HBx protein of the different genotypes was transiently transfected into Huh7 or HepG2 cells and examined for molecular and protein-biochemical effects on the host cell, usually 72 hours after transfection. This study focused on the most common genotypes A, B, C, D, E and G worldwide.
Based on initial kinome profiling analyses, it was found that HBx differs greatly within their genetic variants and suggests different effects on overall cell function and in particular on mitochondrial kinases. Furthermore, confocal laser scanning microscopy reveals profound HBx-mediated changes in the mitochondrial network structure, however with major differences among the different genotypes. In particular, HBx of genotypes A and G causes enormous fragmentation of mitochondrial structures, accompanied by emergent changes in mitochondrial function. Due to an increased interaction with the voltage-dependent anion channel 3, a significant loss of mitochondrial membrane potential was also observed, together with an increased radial oxygen stress level and an induction of central mitochondria-dependent inflammatory mediators. In contrast, the contribution of HBx-genotype B and E reveals only moderate effects in these regards. Using a pH-sensitive reporter system, HBx genotypes which previously indicated a strong distribution in the mitochondrial morphology and function, also showed an elevated mitophagy through the PINK1/Parkin-mediated pathway. This study provides direct evidence that HBx-mediated changes in host cell signaling pathways, especially in mitochondrial-associated pathways, fundamentally dependent on the different genotypes. In addition, the results also indicate an important role of HBx in the process of genotype-dependent liver pathogenesis and provide insight into the underlying cellular mechanisms and signaling pathways.
Microstates sind kurzzeitig andauernde, wiederkehrende elektrische Potentialfelder über dem Kortex. Ein Großteil der Signalvarianz des
Elektroenzephalogramms (EEG) wird durch vier repräsentative räumliche Potentialverteilungen (Topographien) abgedeckt, welche bereits im Wachzustand und im Schlaf identifiziert wurden und kanonisch als Karten A-D bezeichnet werden. Microstates wurden in den vergangenen Jahren vor allem im Ruhe-Wach-EEG untersucht, über andere Vigilanzzustände hingegen wissen wir bisher wenig. Klassischerweise analysieren wir verschiedene Vigilanzzustände im Elektroenzephalogramm anhand von Frequenzen und Graphoelementen, die Microstate-Analyse hingegen betrachtet in erster Linie die räumliche Verteilung des kortikalen Potentials zu einem jeweiligen Zeitpunkt.
Die vorliegende Studie hatte zum Ziel, die zeitliche Abfolge von Microstates im Wachzustand und im Schlaf zu charakterisieren. Mittels informationstheoretischer Ansätze können die dynamischen Eigenschaften der Microstate-Sequenz direkt mit den frequenzbasierten Eigenschaften des zugrundeliegenden EEG verglichen werden. Es wurden die Ruhe-Wach- und Schlafdaten von 32 gesunden Probanden analysiert. Hierbei fand sich eine Zunahme der mittleren Microstate-Dauer und der Relaxationszeit der Übergangsmatrix, was langsamere Dynamiken im Schlaf anzeigt. Erstaunlicherweise konnte im Tiefschlaf mehr als die Hälfte der Sequenzen nicht von einem simplen Markov-Modell unterschieden werden, was für eine Abnahme der Komplexität der Microstate-Sequenzen spricht. Die Entropierate der untersuchten Sequenzen nahm mit zunehmender Schlaftiefe ab, was weniger
Zufall bzw. eine größere Vorhersagbarkeit innerhalb der Sequenzen bedeutet.
Darüberhinaus konnte gezeigt werden, dass Microstates immer dann periodisch auftreten, wenn das zugrundeliegende EEG eine dominante Grundfrequenz aufweist, sodass oszillatorische Hirnaktivität auch auf der Microstate-Ebene verfolgbar ist. Hierdurch ist es möglich, physiologische Vigilanzzustände quantitativ voneinander zu unterscheiden.
Interpretiert man Microstates als Korrelate neuronaler Netzwerke, scheinen im Schlaf dieselben oder ähnliche Netzwerke aktiviert zu werden wie im Wachzustand, allerdings mit zunehmender Schlaftiefe langsamer und auf eine weniger komplexe Art und Weise.
Molecular concepts for pandemic viruses : membrane fusion assays and targeting of reservoir cells
(2024)
In den letzten Jahren haben verschiedene pandemische Viren zu beträchtlichen Krankheits- und Todesfällen geführt. Um dieser ständigen Bedrohung entgegenzuwirken, ist es wichtig diagnostische Testsysteme und Therapien anzupassen oder neu zu etablieren. Diese Arbeit konzentriert sich auf die pandemischen Viren SARS-CoV-2 und HIV.
Der Zelleintritt von SARS-CoV-2 wird durch das Spike-Protein (S) ausgelöst, welches die Fusion der Virushülle mit der zellulären Membran bewirkt. Erste Studien haben gezeigt, dass das S-Protein eine hohe Fusionsaktivität aufweist. Aus diesem Grund sollten in dieser Arbeit neue Fusionstests etabliert werden, um potenzielle Inhibitoren der Zellfusion zu evaluieren. Im ersten Teil dieser Thesis wird die Etablierung von quantitativen Tests zur Evaluierung der Zell-Zell und Partikel-Zell Fusionsaktivität, welche durch S bewirkt wird, demonstriert.
Trotz jahrelanger Forschung können HIV-Patienten nicht geheilt werden und Virusinfektionen treten weiterhin weltweit auf. Das größte Problem bei der Entwicklung eines Heilmittels ist die frühe Bildung von Reservoirzellen während einer Infektion. Um diese Reservoirzellen zu identifizieren, wurde der Oberflächenmarker CD32a vorgeschlagen. Die Nutzung von Cas9-Nukleasen zur Inaktivierung von HIV ist in vitro erfolgreich, aber der effiziente Transfer in Reservoirzellen bleibt weiterhin herausfordernd. Im zweiten Teil dieser Thesis werden Rezeptor-gerichtete Adeno-assoziierte Vektoren (AAVs) für die HIV-Gentherapie präsentiert, die CD4 und CD32a für den Zelleintritt nutzen.
Zur Charakterisierung der Fusionsaktivität von SARS-CoV-2 wurden drei quantitative Fusionstests etabliert, welche Partikel- und Zell-Zell Fusionen berücksichtigen. Für den Partikel-Zell Fusionstest wurden lentivirale Vektoren (LV) verwendet, welche das S-Protein auf ihrer Oberfläche präsentierten. Die Transduktionseffizienz von S-LV erreichte auf Zellen, die den SARS-CoV-2 Rezeptor ACE2 exprimieren, ein Signal-zu-Hintergrund Verhältnis von über 2000. Durch die Präsentation von S auf leeren LV-Partikeln konnte die Fusion von benachbarten Zellen detektiert und quantifiziert werden („fusion-from-without“ (FFWO)). Für die Quantifizierung wurde ein Reporter-Komplementationstest etabliert. Hierbei wurden die Alpha- und Omega-Fragmente der β-Galaktosidase getrennt in zwei Zielzellpopulationen exprimiert, die beide ACE2 exprimierten. Durch die Zugabe von S-Partikeln kam es zur Fusion der Zielzellen und zur Komplementation der Alpha- und Omega-Fragmente. Die resultierende β-Galaktosidase-Aktivität konnte anschließend quantifiziert werden. Unter optimalen Versuchsbedingungen erreichte dieser Assay ein Signal-zu-Hintergrund Verhältnis von 2,7 Größenordnungen. Anschließend wurde der Komplementationstest für die Messung der Zell-Zell Fusion verwendet. In diesem Test exprimierten Effektorzellen S und das Alpha-Fragment, Zielzellen ACE2 und das Omega-Fragment. Obwohl die S-Expression auf den Effektorzellen sehr gering war, konnte dennoch eine signifikante Fusion nachgewiesen werden. Auch hier konnte unter optimalen Versuchsbedingungen ein hohes Signal-zu-Hintergrund Verhältnis von 2,9 Größenordnungen festgestellt werden. Nach der Etablierung der Testsysteme wurden S-spezifische Inhibitoren verwendet. Im Gegensatz zu Partikel-Zell-Fusionen wurde die Fusionsaktivität von S auf Zellen nur mäßig inhibiert. Dies deutet daraufhin, dass das Eindringen von Partikeln in Zellen wirksamer verhindert werden kann als die Ausbreitung durch Zell-Zell Fusionen.
Um AAVs spezifisch an HIV-Reservoirzellen zu binden, wurden CD4- und CD32a-spezifische DARPins („designed ankyrin repeat proteins“) in Rezeptor-verblindete AAVs eingebaut. Ebenso wurden beide DARPins gleichzeitig auf dem Kapsid präsentiert, um eine höhere Spezifität für doppelt-positive Zellen zu erreichen. Wenn diese Partikel einer Zellmischung aus CD4-, CD32a- und CD4/CD32a-exprimierenden Zellen zugesetzt wurden, transduzierten die bispezifischen Vektoren vorzugsweise doppelt-positive Zellen. Diese Präferenz war am höchsten in Zellkulturen, die stark unterrepräsentierte CD4/CD32a-exprimierende Zellen enthielten. Unter diesen Voraussetzungen erreichten bispezifische Vektoren eine bis zu 66-fach höhere Transduktionseffizienz auf CD4/CD32a-positive Zellen im Vergleich zu CD32a-exprimierenden Zellen. Darüber hinaus zeigten bispezifische AAV eine präferentielle Bindung und Transduktion von isolierten Primärzellen und Zellen in Vollblut. Selbst nach systemischer Injektion in humanisierte Mäuse wurden doppelt-positive Zellen effizienter von bispezifischen als von monospezifischen AAVs transduziert. Schließlich zeigten die generierten Vektoren, welche die Cas9 Nuklease transferierten, eine effiziente Inhibition der HIV-Replikation.
Die E3-Ubiquitinligase TRIM25 ist in verschiedenen humanen Tumoren verstärkt exprimiert, was häufig mit einer schlechten Prognose der betroffenen Patienten sowie dem Auftreten von Therapieresistenzen korreliert. Unsere Arbeitsgruppe konnte TRIM25 zuvor als Caspase-2 und -7 mRNA-bindendes Protein und negativen Regulator beider Caspasen in humanen Kolonkarzinomzellen identifizieren. Ein transienter TRIM25 Knockdown führt in Abhängigkeit der erhöhten Expression der jeweiligen Caspasen zur Sensitivierung der Kolonkarzinomzellen gegenüber Chemotherapeutika-induzierter Apoptose. Ein Ziel dieser Arbeit war, die Übertragbarkeit dieser Erkenntnisse auf einen loss-of-function-Ansatz mit stabilen TRIM25 Knockdown Zellen zu überprüfen. Die stabilen Knockdown Zellen sollten der späteren Etablierung eines Xenograftmodells dienen. Da zahlreiche TRIM Proteine bekannterweise eine vielseitige Rolle bei der Regulation sowohl onkogener als auch tumorsuppressiver Prozesse einnehmen, wurde als weitere maßgebliche Fragestellung dieser Arbeit der Einfluss von TRIM25 auf wichtige tumorigene Eigenschaften wie Proliferation, Migration, Zellzyklus und Inflammation untersucht. TRIM25-abhängige Effekte auf das Migrationsver halten von RKO-Zellen wurden im in vitro-Wundheilungsassay mit stabilen TRIM25 Knock down Zellen analysiert. Aufgrund hoher interexperimenteller Unterschiede im Migrations verhalten derselben Zellklone konnte hinsichtlich einer TRIM25-abhängigen Regulation der Migration jedoch keine eindeutige Aussage getroffen werden. Dagegen belegten die gezeigten Proliferationsassays eine signifikant vermehrte Proliferation von RKO-Zellen nach stabilem TRIM25 Knockdown. Dies legt eine tumorsuppressive Rolle von TRIM25 nahe. Durch flusszytometrische Analysen stabiler TRIM25 Knockdown und Kontrollzellen zeigten hinge gen keinen konsistenten Einfluss von TRIM25 auf den Zellzyklus von RKO-Zellen. Eine Sensitivierung von Kolonkarzinomzellen gegenüber Chemotherapeutika-induzierter Apoptose konnte auch in stabilen TRIM25 Knockdown Zellen nachgewiesen werden, während die für transiente Ansätze bekannte, TRIM25 Knockdown-abhängige Hochregulation von Caspase 2 und -7 dagegen deutlich geringer ausgeprägt war. Dies lässt vermuten, dass die Tumorzellen einer Hochregulation Zelltod-induzierender Proteine bei einem konstitutiven TRIM25Knockdown gegenregulieren. Aufgrund der aber nach wie vor nachweisbaren Sensitivierung der TRIM25 Knockdown Zellen gegenüber Apoptose, können zusätzliche, bisher noch nicht bekannte Mechanismen postuliert werden, welche zur Sensitivierung dieser Zellen gegenüber Apoptose beitragen. Die daraus abgeleitete, TRIM25-abhängige Apoptosehemmung spricht für einen „Überlebensmechanismus“, welcher maßgeblich zur Chemotherapieresis tenz von Kolonkarzinomzellen beitragen kann. Hinsichtlich eines Einflusses von TRIM25 auf entzündliche Prozesse wurden RKO-Zellen mit klassischen Aktivatoren des NLRP3-Inflammasoms stimuliert und ausgewählte Marker mittels Western Blot-Analysen nachgewiesen. TRIM25 Knockdown-abhängig war eine verminderte Spaltung der Apoptosemarker Caspase-3, -7 und PARP-1 nachweisbar. Caspase-7 und PARP-1 spielen bekanntermaßen auch im Rahmen Inflammasom-induzierter Signalprozesse eine wichtige Rolle, während die Spaltung von Caspase-3 durch das NLRP3-Inflammasom induziert werden kann und v.a. für apoptotische oder pyroptotische Prozesse verantwortlich gemacht wird. Daher kann postuliert werden, dass der stabile TRIM25 Knockdown zur Hemmung von Inflammasom-induzierten Signalprozessen führt und darüber Kolonkarzinomzellen vor Apoptose/Pyroptose geschützt werden. Umgekehrt deutet dies auf eine Aktivierung von Inflammasom-vermittelten Signalprozessen durch TRIM25 hin.
Aufgrund der hohen Inzidenz und Mortalität, der schlechten Prognose und der Entwicklung von Therapieresistenzen besteht ein dringender Bedarf in der Entwicklung neuer, verbesserter Therapien des kolorektalen Karzinoms sowie der Resensibilisierung der Krebszellen gegenüber gängigen, bereits bestehenden Therapieoptionen. Im Rahmen dieser Arbeit konnte ein onkogener Einfluss von TRIM25 auf Kolonkarzinomzellen durch Hemmung Chemotherapeutika-induzierter Apoptose nachgewiesen werden, während eine mögliche tumorigene Rolle von TRIM25 durch zusätzliche Aktivierung Inflammasom-induzierter Signalprozesse weiterer Untersuchungen bedarf. Zusammenfassend kann TRIM25 als vielversprechender therapeutischer Angriffspunkt für die Entwicklung von sowohl neuen antientzündlichen als auch tumorsuppressiven Therapien betrachtet werden.
Magnetoencephalography (MEG) and Electroencephalography (EEG) provide direct electrophysiological measures at an excellent temporal resolution, but the spatial resolution of source-reconstructed current activity is limited to several millimetres. Here we show, using simulations of MEG signals and Bayesian model comparison, that non-invasive myelin estimates from high-resolution quantitative magnetic resonance imaging (MRI) can enhance MEG/EEG source reconstruction. Our approach assumes that MEG/EEG signals primarily arise from the synchronised activity of pyramidal cells, and since most of the myelin in the cortical sheet originates from these cells, myelin density can predict the strength of cortical sources measured by MEG/EEG. Leveraging recent advances in quantitative MRI, we exploit this structure-function relationship and scale the leadfields of the forward model according to the local myelin density estimates from in vivo quantitative MRI to inform MEG/EEG source reconstruction. Using Bayesian model comparison and dipole localisation errors (DLEs), we demonstrate that adapting local forward fields to reflect increased local myelination at the site of a simulated source explains the simulated data better than models without such leadfield scaling. Our model comparison framework proves sensitive to myelin changes in simulations with exact coregistration and moderate-to-high sensor-level signal-to-noise ratios (≥10 dB) for the multiple sparse priors (MSP) and empirical Bayesian beamformer (EBB) approaches. Furthermore, we sought to infer the microstructure giving rise to specific functional activation patterns by comparing the myelin-informed model which was used to generate the activation with a set of test forward models incorporating different myelination patterns. We found that the direction of myelin changes, however not their magnitude, can be inferred by Bayesian model comparison. Finally, we apply myelin-informed forward models to MEG data from a visuo-motor experiment. We demonstrate improved source reconstruction accuracy using myelin estimates from a quantitative longitudinal relaxation (R1) map and discuss the limitations of our approach.
Highlights
We use quantitative MRI to implement myelin-informed forward models for M/EEG
Local myelin density was modelled by adapting the local leadfields
Myelin-informed forward models can improve source reconstruction accuracy
We can infer the directionality of myelination patterns, but not their strength
We apply our approach to MEG data from a visuo-motor experiment
Mnemonic but not contextual feedback signals defy dedifferentiation in the aging early visual cortex
(2024)
Perception is an intricate interplay between feedforward visual input and internally generated feedback signals that comprise concurrent contextual and time-distant mnemonic (episodic and semantic) information. Yet, an unresolved question is how the composition of feedback signals changes across the lifespan and to what extent feedback signals undergo age-related dedifferentiation, that is, a decline in neural specificity. Previous research on this topic has focused on feedforward perceptual representation and episodic memory reinstatement, suggesting reduced fidelity of neural representations at the item and category levels. In this fMRI study, we combined an occlusion paradigm that filters feedforward input to the visual cortex and multivariate analysis techniques to investigate the information content in cortical feedback, focusing on age-related differences in its composition. We further asked to what extent differentiation in feedback signals (in the occluded region) is correlated to differentiation in feedforward signals. Comparing younger (18–30 years) and older female and male adults (65–75 years), we found that contextual but not mnemonic feedback was prone to age-related dedifferentiation. Semantic feedback signals were even better differentiated in older adults, highlighting the growing importance of generalized knowledge across ages. We also found that differentiation in feedforward signals was correlated with differentiation in episodic but not semantic feedback signals. Our results provide evidence for age-related adjustments in the composition of feedback signals and underscore the importance of examining dedifferentiation in aging for both feedforward and feedback processing.
Childhood is a period when memory consolidation and knowledge base undergo rapid changes. The present study examined short-delay (overnight) and long-delay (after a 2-week period) consolidation of new information either congruent or incongruent with prior knowledge in typically developing 6- to 8-year-old children (n = 32), 9- to 11-year-old children (n = 33), and 18- to 30-year-old young adults (YA; n = 39). Both memory accessibility (cued recall of objects) and precision (precision of object placement) of initially well-learned object–scene pairs were measured. Our results showed that overnight, memory accessibility declined similarly in all age groups; memory precision improved more in younger children (YC) compared to older children (OC) and even declined in YA. After a 2-week period, both memory accessibility and precision became worse. Specifically, while age groups showed similar decline in memory accessibility, precision decline was less in YC than in OC and YA. The accessibility and precision of congruent and incongruent information changed similarly with consolidation in all age groups. Taken together, our results showed that, for initially well-learned information, YC have robust memory consolidation, despite their overall lower mnemonic performance compared to OC and YA, which is potentially crucial for stable and precise knowledge accumulation early on in development.
Inflammation is a regulated reaction of the body to control a threat such as infection or injury. An efficient resolution of inflammation is critical to prevent the development of chronic inflammation and to restore tissue homeostasis. Macrophages (Mf) play a crucial role in the onset, but also in the resolution of inflammation, because they phagocytose and eliminate pathogens and tissue debris. Efficient efferocytosis, i.e. the engulfment of apoptotic cells, represents an important trigger for the onset of the resolution response and contributes to the pro-resolving reprogramming of Mf. Despite the importance of post- transcriptional modes of regulation during the resolution phase and translational control as a key node modulating gene expression in immune cells, relevant translational alterations remain largely elusive.
In the present study, I aimed to identify translationally regulated targets in inflammatory primary murine Mf upon resolution-promoting efferocytosis. To this end, I used total RNA-sequencing as well as de novo proteomics analyses to determine global transcriptional and translational changes. Sequencing data confirmed that efferocytosis induced a pro-resolution signature in inflammatory Mf and pointed towards translational regulation because the related integrated stress response was enriched upon efferocytosis. While changes of gene expression between efferocytic and non-efferocytic Mf appeared rather small at the transcriptional level, I observed considerable differences at the level of de novo synthesized proteins. This finding suggests a regulation at the level of translation. Furthermore, the tight connection between translational and metabolic changes was confirmed by enriched metabolism-associated terms of targets upregulated by efferocytosis at both RNA and de novo protein level. Interestingly, analysis of translationally regulated targets in response to inflammatory stimulation showed reduced translation for most targets, with only little impact of efferocytosis. Among those targets, I identified pro-resolving matrix metallopeptidase 12 (Mmp12) as a novel candidate, which showed translational repression during early inflammation and translational increase during the resolution phase. Noteworthy, a first indicator for a potential translation regulatory component of Mmp12 were the extremely high mRNA levels and not overly high de novo protein levels. Validation experiments recapitulated a slight elevation of Mmp12 mRNA expression and a significant downregulation of MMP12 intracellular protein levels in inflammatory Mf, as observed in the RNA-seq and de novo proteomics datasets. To investigate whether the discrepancy in mRNA and protein expression were due to changes in translation, I applied polysomal fractionation analysis to determine the translational status of Mmp12. Inflammatory Mf displayed a significantly lower relative Mmp12 mRNA abundance in the late polysomes compared to naïve Mf, suggesting reduced translational efficiency upon inflammatory stimulation. Consequently, extracellular MMP12 levels in the supernatant of inflammatory Mf decreased, although with a slight delay.
The functional impact of attenuated Mmp12 translation upon inflammatory stimulation was assessed in migration assays. While siRNA-mediated knockdown of Mmp12 did not alter Mf migration on uncoated plates, it increased migration 3-fold on matrigel/elastin-coated plates. Importantly, the increase in migrated distance driven by siMmp12 could be lowered by the addition of exogenous recombinant MMP12 protein. In line with reduced Mmp12 translation and MMP12 protein in inflammatory Mf, I observed a significant increase in cell migration on matrigel/elastin-coated plates, while it remained unaltered on uncoated plates. Consequently, Mf elastase MMP12 degrades elastin, thereby cell migration along elastin fibers is diminished. In inflammatory Mf, Mmp12 is translationally downregulated, thereby enhancing the migratory capacity.
In summary, the present study identifies a substantial contribution of translational regulation in the course of inflammation shown by high changes between inflammatory naïve and efferocytic Mf at the de novo proteomic level. Specifically, I was able to determine the translational regulation of pro-resolving Mmp12, which is repressed during early inflammation and recovers during the resolution phase. Functionally, translational control of MMP12 emerged as a strategy to alter the migratory properties of Mf, enabling enhanced, matrix- dependent migration of Mf during the early inflammatory phase, while restricting migration during the resolution phase.
Background: A good physician should be empathic and altruistic, among other qualities. Therefore, the levels of socially undesirable personality traits (Dark Triad) as well as implicit motives of achievement, affiliation and power (Multi-Motive Grid) among medical students as future physicians were analyzed at two different points in their medical training.
Methods: This study includes 380 medical students in their first year and 217 in their third year in Germany. All participants completed the Dirty Dozen (DD) and Multi-Motive Grid (MMG) questionnaires at the end of two different classes as paper-and-pencil tests. Relevant differences of the Dark Triad traits between the medical students and reference sample and the two different cohorts, as well as their implicit motives, the associations of Dark Triad traits and MMG components and gender differences of the Dark Triad traits were calculated.
Results: There were no significant group differences between year one and year three medical students in narcissism, psychopathy and Machiavellianism (Dark Triad). There were no significant differences between the medical students and reference sample except in psychopathy. Male students scored significantly higher in the Dark Triad traits than female students. In the MMG, first-year students scored significantly higher levels in Fear of Rejection, and lower levels in Hope of Success and Hope of Power than the third-year students. Some associations were found between narcissism and Machiavelliansim with Hope of Success, Hope of Power and Fear of power.
Conclusions: Dark Triad traits already appear to exist before the commencement of medical studies. These traits do not differ significantly between the medical students and reference sample; only a few MMG components seem to differ at different stages of their studies. This lack of differences between the medical students and validation cohort indicates that tests based on (undesirable) personality traits are not suitable criteria for the admission selection of medical students.
Human feline leukaemia virus subgroup C receptor-related proteins 1 and 2 (FLVCR1 and FLVCR2) are members of the major facilitator superfamily1. Their dysfunction is linked to several clinical disorders, including PCARP, HSAN and Fowler syndrome2,3,4,5,6,7. Earlier studies concluded that FLVCR1 may function as a haem exporter8,9,10,11,12, whereas FLVCR2 was suggested to act as a haem importer13, yet conclusive biochemical and detailed molecular evidence remained elusive for the function of both transporters14,15,16. Here, we show that FLVCR1 and FLVCR2 facilitate the transport of choline and ethanolamine across the plasma membrane, using a concentration-driven substrate translocation process. Through structural and computational analyses, we have identified distinct conformational states of FLVCRs and unravelled the coordination chemistry underlying their substrate interactions. Fully conserved tryptophan and tyrosine residues form the binding pocket of both transporters and confer selectivity for choline and ethanolamine through cation–π interactions. Our findings clarify the mechanisms of choline and ethanolamine transport by FLVCR1 and FLVCR2, enhance our comprehension of disease-associated mutations that interfere with these vital processes and shed light on the conformational dynamics of these major facilitator superfamily proteins during the transport cycle.
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.
Highlights:
• Assessment of body composition parameters in a large cohort of patients with HCC undergoing TACE.
• Fully automated artificial intelligence-based quantitative 3D volumetry of abdominal cavity tissue composition.
• Skeletal muscle volume and related parameters were independent prognostic factors in patients with HCC undergoing TACE.
Background & Aims: Body composition assessment (BCA) parameters have recently been identified as relevant prognostic factors for patients with hepatocellular carcinoma (HCC). Herein, we aimed to investigate the role of BCA parameters for prognosis prediction in patients with HCC undergoing transarterial chemoembolization (TACE).
Methods: This retrospective multicenter study included a total of 754 treatment-naïve patients with HCC who underwent TACE at six tertiary care centers between 2010–2020. Fully automated artificial intelligence-based quantitative 3D volumetry of abdominal cavity tissue composition was performed to assess skeletal muscle volume (SM), total adipose tissue (TAT), intra- and intermuscular adipose tissue, visceral adipose tissue, and subcutaneous adipose tissue (SAT) on pre-intervention computed tomography scans. BCA parameters were normalized to the slice number of the abdominal cavity. We assessed the influence of BCA parameters on median overall survival and performed multivariate analysis including established estimates of survival.
Results: Univariate survival analysis revealed that impaired median overall survival was predicted by low SM (p <0.001), high TAT volume (p = 0.013), and high SAT volume (p = 0.006). In multivariate survival analysis, SM remained an independent prognostic factor (p = 0.039), while TAT and SAT volumes no longer showed predictive ability. This predictive role of SM was confirmed in a subgroup analysis of patients with BCLC stage B.
Conclusions: SM is an independent prognostic factor for survival prediction. Thus, the integration of SM into novel scoring systems could potentially improve survival prediction and clinical decision-making. Fully automated approaches are needed to foster the implementation of this imaging biomarker into daily routine.
Impact and implications: Body composition assessment parameters, especially skeletal muscle volume, have been identified as relevant prognostic factors for many diseases and treatments. In this study, skeletal muscle volume has been identified as an independent prognostic factor for patients with hepatocellular carcinoma undergoing transarterial chemoembolization. Therefore, skeletal muscle volume as a metaparameter could play a role as an opportunistic biomarker in holistic patient assessment and be integrated into decision support systems. Workflow integration with artificial intelligence is essential for automated, quantitative body composition assessment, enabling broad availability in multidisciplinary case discussions.
Highlights
• It is important to distinguish acute provoked seizures due to autoimmune encephalitis from chronic unprovoked seizures due to autoimmune-associated epilepsy.
• Currently it is hardly possible in an individual AIE/ALE/RE patient to separate acute provoked seizures from chronic unprovoked seizures due to limitations in determining seizure outcomes, unclear time courses, potential causal interactions between both seizure origins, compartmentalized immune-inflammation, and a lack of licensed drugs to reliably resolve immune-inflammation in the brain parenchyma.
• This makes it hard to decide when to terminate ASMs and to counsel the individual patient regarding driving abilities and other behavioral restrictions and recommendations.
• Studies are urgently needed to define clinical and paraclinical biomarkers in a hypothesis-free, data-driven approach reliably predicting (or not) the development of AAE and the cognitive and behavioral outcome in the due course of an individual patient´s disease.
• These studies should be experimentally validated in suitable animal models.
Abstract
The current International League Against Epilepsy (ILAE) definition and classification guidelines for the first time introduced the category of immune-mediated focal epilepsy in addition to structural, genetic, infectious, and metabolic aetiologies. Moreover, the ILAE Autoimmunity and Inflammation Taskforce recently provided a conceptual framework for the distinction between acute “provoked” seizures in the acute phase of autoimmune encephalitis from chronic “unprovoked” seizures due to autoimmune-associated epilepsy. The first category predominately applies to those autoimmune encephalitis patients with autoantibodies against cell surface neural antigens, in whom autoantibodies are assumed to exert a direct ictogenic effect without overt structural damage. These patients do not exhibit enduring predisposition to seizures after the “acute phase” encephalitis, and thus do not fulfil the definition of epilepsy. The second category applies to those autoimmune encephalitis patients with autoantibodies against intracellular neural antigens and Rasmussen's encephalitis, in whom T cells are assumed to cause epileptogenic effects through immune-inflammation and overt structural damage. These patients do exhibit enduring predisposition to seizures after the “acute phase” of encephalitis and thus fulfil the definition of epilepsy. AAE may result from both, ongoing brain autoimmunity and associated structural brain damage according to the current ILAE definition and classification guideline. We here discuss the shortcomings and defaults of this concept and suggest an unbiased translationally validated and data-driven approach to predict in an individual encephalitis patient the propensity to develop (or not) AAE and the cognitive and behavioural outcome.
Hintergrund: Mit der im Jahr 2020 aktualisierten AWMF-Leitlinie zur Versorgung mit einem Cochleaimplantat (CI) wurde erstmals der gesamte Prozess einer CI-Versorgung definiert. In der vorliegenden Studie wurden die Machbarkeit und die Ergebnisse einer sehr frühen Rehabilitationsmaßnahme (Reha) untersucht.
Methodik: Es wurden 54 Patienten in die Interventionsgruppe (IG) eingeschlossen, bei der die Reha innerhalb von 14 (maximal 28) Tagen nach der Implantation eingeleitet wurde. In eine Kontrollgruppe (KG, n = 21) wurden Patienten mit deutlich längerer Wartezeit eingeschlossen. Neben dem Beginn und der Dauer der Reha wurde das mit CI erreichte Sprachverstehen zu verschiedenen Zeitpunkten innerhalb von 12 Monaten erfasst. Zusätzlich wurde mit Fragebögen der Aufwand der Anpassung des CI-Prozessors und die Zufriedenheit der Patienten mit dem Ergebnis sowie dem Zeitpunkt des Beginns der Reha ermittelt.
Ergebnisse: Die Wartezeit zwischen Implantation und Beginn der Reha lag in der IG bei 14 Tagen und in der KG bei 106 Tagen (Mediane). Es konnten 92,6 % der Patienten der IG die Reha innerhalb von 14 Tagen antreten. Der Effekt der Reha lag in der IG bei 35 und in der KG bei 25 Prozentpunkten (Freiburger Einsilbertest). Nach 6 und 12 Monaten (M) CI-Nutzung zeigten beide Gruppen sowohl in der Testbedingung in Ruhe (IG/KG 6M: 70 %/70 %; 12M: 70 %/60 %, Freiburger Einsilbertest) als auch im Störgeräusch (IG/KG 6M: −1,1 dB SNR/–0,85 dB SNR; 12M: −0,65 dB SNR/+0,3 dB SNR, Oldenburger Satztest) vergleichbare Ergebnisse. Die mittels des Fragebogens Speech, Spatial and Qualities of Hearing Scale (SSQ) erfassten Ergebnisse für die Einschätzung der Hörqualität zeigten nach 6 Monaten eine bessere Bewertung in der IG, die sich nach 12 Monaten an die Ergebnisse der KG anglich. Die IG war mit dem Zeitpunkt des Beginns der Reha deutlich zufriedener als die KG. Alle anderen aus Fragebögen ermittelten Daten zeigten keine Unterschiede zwischen den beiden Gruppen.
Schlussfolgerung: Der sehr frühe Beginn einer stationären Reha nach Cochleaimplantation ist erfolgreich umsetzbar. Die Reha konnte innerhalb von 7 Wochen nach der Implantation abgeschlossen werden. Der Vergleich der Ergebnisse der Tests des Sprachverstehens vor und nach der Reha zeigte eine deutliche Steigerung. Somit ist ein deutlicher Reha-Effekt nachweisbar. Die Aufnahme der CI-Rehabilitation in den Katalog der Anschlussheilbehandlungen ist somit wissenschaftlich begründet und damit dringend zu empfehlen.
Neurodevelopmental psychiatric disorders (NPDs) like attention deficit hyperactivity disorder (ADHD), autism spectrum disorder (ASD), and schizophrenia, affect millions of people worldwide. Despite recent progress in NPD research, much remains to be discovered about their underpinnings, therapeutic targets, effects of biological sex and age. Risk factors influencing brain development and signalling include prenatal inflammation and genetic variation. This dissertation aimed to build upon these findings by combining behavioural, molecular, and neuromorphological investigations in mouse models of such risk factors, i.e. maternal immune activation (MIA), neuron-specific overexpression (OE) of the cytoplasmatic isoforms of the RNA-binding protein RBFOX1, and neuronal deletion of the small Ras GTPase DIRAS2.
Maternal infections during pregnancy pose an increased risk for NPDs in the offspring. While viral-like MIA has been previously established elsewhere, this study was the first in our institution to implement the model. I validated NPD-relevant deficits in anxiety- and depression-like behaviours, as well as dose- and sex-specific social deficits in mouse offspring following MIA in early gestation. Proteomic analyses in embryonic and adult hippocampal (HPC) synaptoneurosomes highlighted novel and known targets affected by MIA. Analysis of the embryonic dataset implicated neurodevelopmental disruptions of the lipid, polysaccharide, and glycoprotein metabolism, important for proper membrane function, signalling, and myelination, for NPD-pertinent sequelae. In adulthood, the observed changes encompassed transmembrane trafficking and intracellular signalling, apoptosis, and cytoskeletal organisation pathways. Importantly, 50 proteins altered by MIA in embryonic and adult HPC were enriched in the NPD-relevant synaptic vesicle cycle. A persistently upregulated protein cluster formed a functional network involved in presynaptic signalling and proteins downregulated in embryos but upregulated in adults by MIA were correlated with observed social deficits. 49/50 genes encoding these proteins were significantly associated with NPD- and comorbidity-relevant traits in human phenome-wise association study data for psychiatric phenotypes. These findings highlight NPD-relevant targets for future study and early intervention in at-risk individuals. MIA-evoked changes in the neuroarchitecture of the NPD-relevant HPC and prefrontal cortex (PFC) of male and female mice highlighted sex- and region-specific alterations in dendritic and spine morphology, possibly underlining behavioural phenotypes.
To further investigate genetic risk factors of NPDs, I performed a study based on the implications of RBFOX1’s pleiotropic role in neuropsychiatric disorders and previous preclinical findings. Cytoplasmatic OE of RBFOX1, which affects the stability and translation of thousands of targets, was used to disseminate its role in morphology and behaviour. RBFOX1 OE affected dendritic length and branching in the male PFC and led to spine alterations in both PFC and HPC. Due to previously observed ASD-like endophenotypes in our Rbfox1 KO mice and the importance of gene × environment effects on NPD susceptibility, I probed the interaction of cytoplasmatic OE and a low-dose MIA on offspring. Both RBFOX1 OE alone and with MIA led to increased offspring loss during the perinatal period. Preliminary data suggested that RBFOX1 OE × MIA might increase anxiety- and anhedonia-like behaviours. Morphological changes in the adult male OE HPC and PFC suggested increased spine density and reduced dendritic complexity. A small post-mortem study in human dorsolateral PFC of older adults did not reveal significant effects of a common risk variant on RBFOX1 abundance.
To expand upon NPD genetic risks, I evaluated the effects of a homo- (KO) or heterozygous (HET) Diras2 deletion in a novel, neuron-specific mouse model. DIRAS2’s function is largely unknown, but it has been associated with ADHD in humans and neurodevelopment in vitro. In adult mice, there were subtle sex-specific effects on behaviour, i.e. more pronounced NPD-relevant deficits in males, in keeping with human data. KO mice had subtly improved cognitive performance, while HET mice exhibited behaviours in line with core ADHD symptoms, e.g. earning difficulties (females), response inhibition deficits and hyperactivity (males), suggesting Diras2 dose-sensitivity and sex-specificity. The morphological findings revealed multiple aberrations in dendritic and spine morphology in the adult PFC, HPC, and amygdala of HET males. KOs changes in spine and dendritic morphology were exclusively in the PFC and largely opposite to those in HETs and NPD-like phenotypes. Region- and genotype-specific expression changes in Diras2 and Diras1 were observed in six relevant brain regions of adult HET and KO females, also revealing differences in the survival and morphology regulator mTOR, which might underlie observed differences.
In conclusion, the effects of MIA and partial Diras2 knockdown resembled each other in core, NPD-associated behavioural and morphological phenotypes, while cytoplasmatic RBFOX1 OE and full Diras2 KO differed from those. My findings suggest complex dose- and sex-dependent relationships between these prenatal and genetic interventions, whose NPD-relevant influences might converge onto neurodevelopmental molecular pathways. An assessment of such putative overlap, based on available data from the MIA proteomic analyses of embryonic and adult HPC, suggested the three models might be linked via downstream targets, interactions, and upstream regulators. Future studies should disseminate both distinct and shared aspects of MIA, RBFOX1, and DIRAS2 relevant to NPDs and build upon these findings.