Kinderklinik und Poliklinik
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Institute
- Kinderklinik und Poliklinik (330)
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- Caritas-Krankenhaus Bad Mergentheim (1)
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- Department of Pediatrics, Pediatrics I, Innsbruck Medical University, Anichstr. 35, 6020, Innsbruck, Austria (1)
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- 229289 (1)
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Respiratory syncytial virus (RSV) is a leading cause of severe lower respiratory tract infection in early childhood. Underlying pathomechanisms of elevated pulmonary morbidity in later infancy are largely unknown. We found that RSV-infected H441 cells showed increased mRNA expression of connective tissue growth factor (CTGF), a key factor in airway remodeling. Additional dexamethasone treatment led to further elevated mRNA levels, indicating additive effects. Caffeine treatment prevented RSV-mediated increase in CTGF mRNA. RSV may be involved in airway remodeling processes by increasing CTGF mRNA expression. Caffeine might abrogate these negative effects and thereby help to restore lung homeostasis.
Background
Infants with history of prematurity (<37 weeks gestation) and low birth weight (LBW, <2500 g) are at high risk of infection due to functional immaturity of normal physical and immunological defense mechanisms. Despite current recommendations that infants with history of prematurity/LBW should receive routine immunization according to the same schedule and chronological age as full-term infants, immunization is often delayed.
Methods
Here we summarize 10 clinical studies and 15 years of post-marketing safety surveillance of GSK’s hexavalent vaccine (DTPa-HBV-IPV/Hib), a combined diphtheria-tetanus-acellular-pertussis-hepatitis-B-inactivated-poliovirus-Haemophilus influenzae-type-b (Hib) conjugate vaccine, when administered alone, or co-administered with pneumococcal conjugate, rotavirus, and meningococcal vaccines and respiratory syncytial virus IgG to infants with history of prematurity/LBW in clinical trials.
Results
At least 92.5% of infants with history of prematurity/LBW as young as 24 weeks gestation in clinical studies were seropositive to all vaccine antigens after 3-dose primary vaccination with GSK’s hexavalent DTPa-HBV-IPV/Hib vaccine, with robust immune responses to booster vaccination. Seropositivity rates and antibody concentrations to hepatitis B and Hib appeared lower in infants with history of prematurity/LBW than term infants. Between 13–30% of medically stable infants with history of prematurity developed apnea after vaccination with GSK’s hexavalent DTPa-HBV-IPV/Hib vaccine; usually after dose 1. The occurrence of post-immunization cardiorespiratory events appears to be influenced by the severity of any underlying neonatal condition. Most cardiorespiratory events resolve spontaneously or require minimal intervention. GSK’s hexavalent DTPa-HBV-IPV/Hib vaccine was well tolerated in co-administration regimens.
Conclusion
GSK’s hexavalent DTPa-HBV-IPV/Hib vaccine alone or co-administered with other pediatric vaccines has a clinically acceptable safety and immunogenicity profile when used in infants with history of prematurity/LBW for primary and booster vaccination. Additional studies are needed in very premature and very LBW infants. However, currently available data support using GSK’s hexavalent DTPa-HBV-IPV/Hib vaccine to immunize infants with history of prematurity/LBW according to chronological age.
Characterization of a novel OTX2-driven stem cell program in Group 3 and Group 4 medulloblastoma
(2018)
Medulloblastoma (MB) is the most common malignant primary pediatric brain cancer. Among the most aggressive subtypes, Group 3 and Group 4 originate from stem/progenitor cells, frequently metastasize, and often display the worst prognosis, yet we know the least about the molecular mechanisms driving their progression. Here, we show that the transcription factor orthodenticle homeobox 2 (OTX2) promotes self-renewal while inhibiting differentiation in vitro and increases tumor initiation from MB stem/progenitor cells in vivo. To determine how OTX2 contributes to these processes, we employed complementary bioinformatic approaches to characterize the OTX2 regulatory network and identified novel relationships between OTX2 and genes associated with neuronal differentiation and axon guidance signaling in Group 3 and Group 4 MB stem/progenitor cells. In particular, OTX2 levels were negatively correlated with semaphorin (SEMA) signaling, as expression of 9 SEMA pathway genes is upregulated following OTX2 knockdown with some being potential direct OTX2 targets. Importantly, this negative correlation was also observed in patient samples, with lower expression of SEMA4D associated with poor outcome specifically in Group 4 tumors. Functional proof-of-principle studies demonstrated that increased levels of select SEMA pathway genes are associated with decreased self-renewal and growth in vitro and in vivo and that RHO signaling, known to mediate the effects of SEMA genes, is contributing to the OTX2 KD phenotype. Our study provides mechanistic insight into the networks controlled by OTX2 in MB stem/progenitor cells and reveals novel roles for axon guidance genes and their downstream effectors as putative tumor suppressors in MB.
Objectives
Parapneumonic pleural effusions/empyema (PPE/PE) are severe complications of community-acquired pneumonia. We investigated the bacterial aetiology and incidence of paediatric PPE/PE in Germany after the introduction of universal pneumococcal conjugate vaccine (PCV) immunization for infants.
Methods
Children <18 years of age hospitalized with pneumonia-associated PPE/PE necessitating pleural drainage or persisting >7 days were reported to the German Surveillance Unit for Rare Diseases in Childhood between October 2010 and June 2017. All bacteria detected in blood or pleural fluid (by culture/PCR) were included, with serotyping for Streptococcus pneumoniae.
Results
The median age of all 1447 PPE/PE patients was 5 years (interquartile range 3–10). In 488 of the 1447 children with PPE/PE (34%), 541 bacteria (>40 species) were detected. Aerobic gram-positive cocci accounted for 469 of 541 bacteria detected (87%); these were most frequently Streptococcus pneumoniae (41%), Streptococcus pyogenes (19%) and Staphylococcus aureus (6%). Serotype 3 accounted for 45% of 78 serotyped S. pneumoniae strains. Annual PPE/PE incidence varied between 14 (95%CI 12–16) and 18 (95%CI 16–21) PPE/PE per million children. Incidence of S. pneumoniae PPE/PE decreased from 3.5 (95%CI 2.5–4.6) per million children in 2010/11 to 1.5 (95%CI 0.9–2.4) in 2013/14 (p 0.002), followed by a re-increase to 2.2 (95%CI 1.5–3.2) by 2016/17 (p 0.205).
Conclusions
In the era of widespread PCV immunization, cases of paediatric PPE/PE were still caused mainly by S. pneumoniae and, increasingly, by S. pyogenes. The re-increase in the incidence of PPE/PE overall and in S. pneumoniae-associated PPE/PE indicates ongoing changes in the bacterial aetiology and requires further surveillance.
In der Pathogenese der Psoriasis spielen IL 17 und die Plastizität von Tregs zu Th17 Zellen mit Produktion proinflammatorischer Zytokine sowie die möglicherweise reduzierte suppressive Funktion von Tregs eine entscheidende Rolle. Wir versuchten daher in unserer Arbeit einen Überblick über die T Zellverteilung im peripherem Blut bei PSO und HC zu erhalten und die Reaktion der Zellen auf IL 17, anti IL 17 und Secukinumab sowie ein Th 17 induzierendes Milieu im Vergleich von PSO und HC zu evaluieren.
In der Analyse der PBMCs von PSO und HC konnten bei PSO tendenziell weniger inflammatorische Marker, wahrscheinlich aufgrund der niedrigen Krankheitsaktivität und der bereits eingeleiteten medikamentösen Therapie festgestellt werden.
Nach Isolierung der Tregs und Kultivierung konnten bei PSO im Vergleich zu HC erhöhte inflammatorische Marker nachgewiesen werden. Dies kann an der höheren Plastizität von Tregs bei PSO ex vivo ohne den Einfluss einer medikamentösen Therapie hin zu inflammatorischen Zellen.
In den Suppressionsversuchen zeigte sich sowohl bei PSO als auch bei HC unter Th17 Milieu eine verminderte Inhibition der PBMCs durch die autologen Tregs.
Ursächlich hierfür könnte eine Dysregulation der Tregs durch das Th17 Milieu oder eine Auswirkung des Th17-induzierenden Cocktails auf die PBMCs im Sinne einer Effektorresistenz gegenüber den Tregs sein.
Eine Veränderung der Suppression ergab sich für IL 17 oder anti IL 17 nicht. Unter der gleichzeitigen Kultivierung mit Secukinumab und einem Th17 induzierendem Cocktail konnte keine verbesserte Inhibition festgestellt werden.
Insgesamt bestätigt die Arbeit eine Instabilität der Tregs bei PSO mit der Möglichkeit der Plastizität zu Th17 Zellen unter proinflammatorischem Milieu, sowie einen Verlust der Suppressionsfähigkeit durch eine Treg Dysfunktion oder eine erhöhte Effektorresistenz. Für IL 17 oder die Blockade von IL 17 durch monoklonale Antikörper konnte in unserer Studie kein Einfluss festgestellt werden.
The regulation of immune cell migration throughout the body is essential to warrant immunosurveillance and to maintain immune homeostasis. Marking and tracking of these cells has proven important to study mechanisms of immune cell trafficking and cell interaction in vivo. Photoconversion is a well-suited technique for intravital application because it enables contactless time- and location-specific marking of cells in the tissue without surgically manipulating the microenvironment of the cells in question. However, in dividing cells the converted fluorescent protein may decline quickly. Here, we provide a detailed description of the photoconversion technique and its applicability to tracking highly proliferating T cells from the priming site of T cell activation to peripheral target organs of effector function in a preclinical model. Dendra2+ T cells were photoconverted in the Peyer’s patches during the initiation phase of acute graft-versus-host disease (GvHD) and tracked through the mesenteric lymph nodes and the peripheral blood to the small intestine with flow cytometry and intravital two-photon microscopy. Photoconverted alloreactive T cells preserved the full proliferative capacity, homing, and migration of alloreactive T cells in the intestinal lamina propria. We conclusively proved that photoconversion of highly proliferative alloreactive T cells in the Peyer’s patches is an effective tool to study trafficking of alloreactive T cells under physiologic conditions and to GvHD target tissues. This technique can also be applied to the study of immune cell tracking under inflammatory and non-inflammatory conditions.
In dieser Arbeit wurde der Impfstatus der Würzburger Medizinstudierenden von 2004-2020 entsprechend der jeweils im sechsten Semester geltenden STIKO Empfehlungen ausgewertet (im folgenden Impfquote genannt) und mit den Ergebnissen von Studien an Universitäten in Frankfurt, Bochum und Dresden, sowie der Allgemeinbevölkerung und dem medizinischen Personal in Deutschland verglichen. Außerdem wurde ausgewertet, inwiefern das Angebot der Nachimpfungen im Impfkurs angenommen wurde und mögliche Zusammenhänge mit aufgedeckten Impflücken wurden diskutiert.
Bei manchen impfpräventablen Infektionskrankheiten (IPIE) wie Pertussis war von 2004-2020 ein deutlicher Anstieg der Impfquote (von <2% auf knapp 90%) zu beobachten, bei anderen, wie Tetanus war bereits seit 2004 eine Impfquote von etwa 75-90% zu sehen, der über die gesamte Beobachtungszeit auf etwa 85-90% anstieg.
Im Vergleich zu anderen Studien mit Medizinstudierenden anderer Universitäten in Deutschland schnitten die Würzburger Medizinstudierenden in Bezug auf Masern, Mumps, Röteln und Varizellen mit Impfquoten um die 80-90% oder höher im Vergleich zu 73-86% in den anderen Städten durchweg besser ab. Bei Hepatitis B war anfangs eine vergleichbare (65-90%), später eine höhere Impfquote (um die 80%) als in den Vergleichsstudien (um die 40%) zu beobachten. In Bezug auf Tetanus (Impfquote im Schnitt 85,2%), Diphtherie (Impfquote im Schnitt 82,9%), Pertussis (Impfquote im Schnitt 49,3%) und Influenza (Impfung in Vorsaison im Schnitt bei 29,3%) waren die Daten aus Würzburg gut mit den Daten aus Vorstudien in ähnlichen Zeiträumen vergleichbar.
Im Vergleich zu Daten zur Impfquote bei Meningokokken und HPV aus der Allgemeinbevölkerung lagen die Würzburger Medizinstudierenden von 2017-2020 über den dort verzeichneten Werten (48% zu 29% bzw. 63% zu 53). Im Vergleich zu Daten der Impfsurveillance des RKI aus 2020 zeigte sich der Effekt der Impfempfehlung bei Kindern (Meningokokken: 90% der 4-7 Jährigen, HPV: 63,3% der 14 Jährigen). Bei der Pneumokokken Impfung gaben – obwohl die STIKO Empfehlung nicht auf medizinisches Personal zutrifft – 10,8% der Studierenden an, mindestens einmal geimpft zu sein. Dies könnte ein erhöhtes Gesundheitsbewusstsein der Medizinstudierenden widerspiegeln.
Zusammenfassend kann gesagt werden, dass der Anteil der Würzburger Medizinstudierenden, deren Impfstatus für die einzelnen IPIE den STIKO Empfehlungen für medizinisches Personal entsprach, über die Jahre 2004 bis 2020 angestiegen ist. Zum Großteil lag der Anteil der Studierenden mit Impfstatus entsprechend den STIKO Empfehlungen über dem aus den Studien der anderen Universitäten.
Trotzdem blieben noch deutliche Lücken im Impfstatus, bspw. bei Pertussis oder Masern, und Wissen der Würzburger Medizinstudierenden bestehen. Diese Lücken werden sich auf Dauer in die Ärzteschaft und schließlich auch in die Empfehlungen durch das ärztliche Personal fortsetzen. Deshalb sollte ein besonderer Fokus auf die Verbesserung des Impfstatus Medizinstudierender gelegt werden, beispielsweise durch regelmäßige verpflichtende Kontrollen durch Betriebärzt*in, intensivierte Lehre sowie bessere Aufklärung bereits zu Beginn des Studiums.
Das Format des Impfkurses, wie er in Würzburg durchgeführt wird, scheint ein gut gewähltes Format, um den Studierenden die Möglichkeit zu geben, ihren eigenen Impfstatus zu überprüfen und diesen weiter zu verbessern. Die Impfquote der Studierenden lag in den Jahren 2014 bis 2020 – den Jahren, in denen die Nachimpfungen im Kurs erfasst wurden – im Schnitt nach dem Kurs bei fast allen IPIE über 90%. Nur bei Pertussis lag die Impfquote nach dem Kurs bei 83,4% (vgl. vor dem Kurs 68,4%). Durch nationale Vereinheitlichung der Lehre im NKLM zum Thema Impfen, frühe Auseinandersetzung mit dem Thema und regelmäßige Überprüfung des eigenen Impfstatus sowie niederschwellige Impfangebote im Medizinstudium, kann einerseits eine Verbesserung des Impfstatus von Medizinstudierenden erreicht werden. Andererseits können so auch insgesamt bessere Impfquoten in der Bevölkerung durch die verbesserte Ausbildung von Ärztinnen bereits im Medizinstudium erzielt werden.
Introduction: The German PID-NET registry was founded in 2009, serving as the first national registry of patients with primary immunodeficiencies (PID) in Germany. It is part of the European Society for Immunodeficiencies (ESID) registry. The primary purpose of the registry is to gather data on the epidemiology, diagnostic delay, diagnosis, and treatment of PIDs.
Methods: Clinical and laboratory data was collected from 2,453 patients from 36 German PID centres in an online registry. Data was analysed with the software Stata® and Excel.
Results: The minimum prevalence of PID in Germany is 2.72 per 100,000 inhabitants. Among patients aged 1-25, there was a clear predominance of males. The median age of living patients ranged between 7 and 40 years, depending on the respective PID. Predominantly antibody disorders were the most prevalent group with 57% of all 2,453 PID patients (including 728 CVID patients). A gene defect was identified in 36% of patients. Familial cases were observed in 21% of patients. The age of onset for presenting symptoms ranged from birth to late adulthood (range 0-88 years). Presenting symptoms comprised infections (74%) and immune dysregulation (22%). Ninety-three patients were diagnosed without prior clinical symptoms. Regarding the general and clinical diagnostic delay, no PID had undergone a slight decrease within the last decade. However, both, SCID and hyper IgE-syndrome showed a substantial improvement in shortening the time between onset of symptoms and genetic diagnosis. Regarding treatment, 49% of all patients received immunoglobulin G (IgG) substitution (70%-subcutaneous; 29%-intravenous; 1%-unknown). Three-hundred patients underwent at least one hematopoietic stem cell transplantation (HSCT). Five patients had gene therapy.
Conclusion: The German PID-NET registry is a precious tool for physicians, researchers, the pharmaceutical industry, politicians, and ultimately the patients, for whom the outcomes will eventually lead to a more timely diagnosis and better treatment.
Purpose
Biallelic pathogenic NBAS variants manifest as a multisystem disorder with heterogeneous clinical phenotypes such as recurrent acute liver failure, growth retardation, and susceptibility to infections. This study explores how NBAS-associated disease affects cells of the innate and adaptive immune system.
Methods
Clinical and laboratory parameters were combined with functional multi-parametric immunophenotyping methods in fifteen NBAS-deficient patients to discover possible alterations in their immune system.
Results
Our study revealed reduced absolute numbers of mature CD56dim natural killer (NK) cells. Notably, the residual NK cell population in NBAS-deficient patients exerted a lower potential for activation and degranulation in response to K562 target cells, suggesting an NK cell–intrinsic role for NBAS in the release of cytotoxic granules. NBAS-deficient NK cell activation and degranulation was normalized upon pre-activation by IL-2 in vitro, suggesting that functional impairment was reversible. In addition, we observed a reduced number of naïve B cells in the peripheral blood associated with hypogammaglobulinemia.
Conclusion
In summary, we demonstrate that pathogenic biallelic variants in NBAS are associated with dysfunctional NK cells as well as impaired adaptive humoral immunity.
Innerhalb der Juvenilen Idiopathischen Arthritis (JIA) bilden Patienten mit Antinukleären Antikörpern (ANA) Subgruppen-übergreifend eine klinisch homogene Erkrankungsgruppe. Ob diesen klinischen Gemeinsamkeiten jedoch auch eine einheitliche Pathogenese zugrunde liegt, ist bisher unbekannt. Sogenannte periphere T-Helferzellen (TPH) spielen im Kontext zahlreicher Autoimmunerkrankungen eine entscheidende Rolle bei der Aktivierung autoreaktiver B-Zellen. Ziel dieser Arbeit war daher die phänotypische und funktionelle Analyse von PD-1hiCXCR5-CD4+ TPH-Zellen, sowie deren Verteilung in der Synovialflüssigkeit von Patienten unterschiedlicher Subgruppen der JIA.
Hierzu wurden Phänotyp und Zytokinprofil von PD-1hiCD4+ T-Zellen durchflusszytometrisch analysiert. Der funktionelle Einfluss von PD-1hiCD4+ T-Zellen auf die B-Zell-Differenzierung wurde mittels in vitro Kokulturen FACS-sortierter TPH-Zellen der Synovialflüssigkeit untersucht.
IL-21- und IL-17-produzierende T-Gedächtniszellen der Synovialflüssigkeit zeigten eine negative Korrelation zueinander. Die IL-21-Produktion ging besonders von PD-1hiCXCR5-HLA-DR+CD4+ T-Zellen aus, welche besonders in den Gelenken ANA-positiver JIA-Patienten akkumulierten. Diese Population zeigte phänotypische Ähnlichkeit mit TPH-Zellen und leistete in vitro effiziente B-Zell-Hilfe zu Plasmazelldifferenzierung und Immunglobulinsekretion, induzierte jedoch zudem einen CD21lo/-CD11c+T-bet+ Phänotyp in B-Zellen. Passend hierzu bestand auch ex vivo eine signifikante Korrelation zwischen TPH und CD21lo/-CD11c+T-bet+ doppelt-negativen B-Zellen (BDN).
Es konnte also die Expansion einer spezifischen T-Zellpopulation mit phänotypischen und funktionellen Charakteristika von TPH-Zellen beobachtet und deren funktioneller Zusammenhang mit CD21lo/-CD11c+T-bet+ BDN in der Synovialflüssigkeit von JIA-Patienten aufgezeigt werden. Dies könnte die Autoimmunantwort auf ubiquitäre Autoantigene innerhalb betroffener Gelenke ANA-positiver JIA-Patienten widerspiegeln.
B cell maturation and immunoglobulin (Ig) repertoire selection are governed by expression of a functional B cell receptor (BCR). Naïve B cells co-express their BCR as IgM and IgD isotype. However, the role of the additionally expressed IgD on naïve B cells is not known. Here we assessed the impact of IgD on naïve B cell maturation and Ig repertoire selection in 8 individuals from 3 different families with heterozygous loss-of-function or loss-of expression mutations in IGHD. Although naïve B cells from these individuals expressed IgM on their surface, the IGHD variant in heterozygous state entailed a chimeric situation by allelic exclusion with almost half of the naïve B cell population lacking surface IgD expression. Flow cytometric analyses revealed a distinct phenotype of IgD-negative naïve B cells with decreased expression of CD19, CD20 and CD21 as well as lower BAFF-R and integrin-β7 expression. IgD-negative B cells were less responsive in vitro after engaging the IgM-BCR, TLR7/9 or CD40 pathway. Additionally, a selective disadvantage of IgD-negative B cells within the T2 transitional and mature naïve B cell compartment as well as reduced frequencies of IgMlo/- B cells within the mature naïve B cell compartment lacking IgD were evident. RNA-Ig-seq of bulk sorted B cell populations showed an altered selection of distinct VH segments in the IgD-negative mature naïve B cell population. We conclude that IgD expression on human naïve B cells is redundant for generation of naïve B cells in general, but further shapes the naive B cell compartment starting from T2 transitional B cells. Our observations suggest an unexpected role of IgD expression to be critical for selection of distinct Ig VH segments into the pre-immune Ig repertoire and for the survival of IgMlo/- naïve B cells known to be enriched in poly-/autoreactive B cell clones.
Infections with influenza A viruses (IAV) cause seasonal epidemics and global pandemics. The majority of these infections remain asymptomatic, especially among children below five years of age. Importantly, this is a time, when immunological imprinting takes place. Whether early-life infections with IAV affect the development of antimicrobial immunity is unknown. Using a preclinical mouse model, we demonstrate here that silent neonatal influenza infections have a remote beneficial impact on the later control of systemic juvenile-onset and adult-onset infections with an unrelated pathogen, Staphylococcus aureus, due to improved pathogen clearance and clinical resolution. Strategic vaccination with a live attenuated IAV vaccine elicited a similar protection phenotype. Mechanistically, the IAV priming effect primarily targets antimicrobial functions of the developing innate immune system including increased antimicrobial plasma activity and enhanced phagocyte functions and antigen-presenting properties at mucosal sites. Our results suggest a long-term benefit from an exposure to IAV during the neonatal phase, which might be exploited by strategic vaccination against influenza early in life to enforce the host’s resistance to later bacterial infections.
Autophagy is an essential cellular homeostasis pathway initiated by multiple stimuli ranging from nutrient deprivation to viral infection, playing a key role in human health and disease. At present, a growing number of evidence suggests a role of autophagy as a primitive innate immune form of defense for eukaryotic cells, interacting with components of innate immune signaling pathways and regulating thymic selection, antigen presentation, cytokine production and T/NK cell homeostasis. In cancer, autophagy is intimately involved in the immunological control of tumor progression and response to therapy. However, very little is known about the role and impact of autophagy in T and NK cells, the main players in the active fight against infections and tumors. Important questions are emerging: what role does autophagy play on T/NK cells? Could its modulation lead to any advantages? Could specific targeting of autophagy on tumor cells (blocking) and T/NK cells (activation) be a new intervention strategy? In this review, we debate preclinical studies that have identified autophagy as a key regulator of immune responses by modulating the functions of different immune cells and discuss the redundancy or diversity among the subpopulations of both T and NK cells in physiologic context and in cancer.
Im sechsten Semester des Medizinstudiums an der Julius-Maximilians-Universität Würzburg findet das verpflichtende Praktikum „Impfkurs“ statt. Im Rahmen dieses Kurses wurde vom Sommersemester 2020 bis zum Sommersemester 2021 ein standardisierter online Fragebogen erhoben, der unter anderem demographische Daten sowie Expositionsmöglichkeiten gegenüber SARS-CoV-2 im privaten, beruflichen und universitären Umfeld erfragte. Zusätzlich wurde im gleichen Zeitraum der SARS-CoV-2 Serostatus der Medizinstudierenden erhoben und ausgewertet und dieser mit den Daten des Fragebogens zusammengeführt. Dafür wurden Blutproben entnommen, welche im Labor des Instituts für Virologie der Universität Würzburg mittels Western Blot auf IgG/IgM/IgA Antikörper gegen SARS-CoV-2 untersucht wurden.
Immune checkpoint blockade therapy is beneficial and even curative for some cancer patients. However, the majority don’t respond to immune therapy. Across different tumor types, pre-existing T cell infiltrates predict response to checkpoint-based immunotherapy. Based on in vitro pharmacological studies, mouse models and analyses of human melanoma patients, we show that the cytokine GDF-15 impairs LFA-1/β2-integrin-mediated adhesion of T cells to activated endothelial cells, which is a pre-requisite of T cell extravasation. In melanoma patients, GDF-15 serum levels strongly correlate with failure of PD-1-based immune checkpoint blockade therapy. Neutralization of GDF-15 improves both T cell trafficking and therapy efficiency in murine tumor models. Thus GDF-15, beside its known role in cancer-related anorexia and cachexia, emerges as a regulator of T cell extravasation into the tumor microenvironment, which provides an even stronger rationale for therapeutic anti-GDF-15 antibody development.
Expression immunmodulierende Marker in Zusammenhang mit Immuntherapie bei kindlichen Hirntumoren
(2024)
Atypische teratoide Rhabdoidtumore sind trotz Ausschöpfen der multimodalen Therapieoptionen weiterhin mit einer schlechten Prognose belastet. Gründe hierfür liegen in den oftmals unzureichenden Resektionsmöglichkeiten, dem jungen Erkrankungsalter der PatientInnen und der Resistenz der Tumorzellen gegenüber Chemotherapeutika (Frühwald et al. 2020; Egiz et al. 2022; Richards et al. 2019). Gerade deshalb versucht man durch die aktuelle Forschung zu kindlichen Hirntumoren mit Immuntherapie ein besseres Outcome zu erreichen. Wichtige Grundlagen hierzu sind durch diese Arbeit dargestellt worden. Erstmals wurde gezeigt, dass Tumorzellen der AT/RT sowohl HLA-Klasse I und -Klasse II Antigene präsentieren. Es wurde außerdem die Expression von PD-L1 nachgewiesen. Des Weiteren konnte die Anwesenheit von Immunzellen durch den Nachweis CD 3+ Zellen bewiesen werden. Insgesamt zeigte sich eine große Heterogenität innerhalb des einzelnen und unter den verschiedenen Tumoren. Es zeigte sich eine negative Korrelation zwischen der Expression von MHC I und CD 3+ Zellen, welche insgesamt für einen Tumor Escape Mechanismus sprechen könnte, wie er bereits bei Glioblastomen nachgewiesen wurde (Bagley et al. 2018; Marcu et al. 2021). Es sollte eine Ausweitung der hier begonnen Forschung mit Einbeziehung der personenbezogenen Daten und Vergrößerung der untersuchten Fallzahl erfolgen.
Eine Dysbalance zwischen regulatorischen und proinflammatorischen T-Helferzellen kann zu Autoimmunerkrankungen führen. In dieser methodischen Arbeit wurde die Polarisierbarkeit von peripheren T-Lymphozyten durch verschiedene Zytokin-Stimuli untersucht. Hauptziel war es, CD4+CD25-CD127- Lymphozyten durch Stimulation mit einem IL-2 und TGFβ-beinhaltenden Zytokin-Cocktail (Treg-Cocktail) zu iTregs zu polarisieren und deren Suppressionsfunktion auf autologe Effektor-Leukozyten zu untersuchen.
Es erfolgte eine Phänotypisierung der PBMCs gesunder Probanden, insbesondere im Hinblick auf die Verteilung der T-Lymphozyten-Subpopulationen, deren Zytokinproduktion und FoxP3-Expression. Zudem wurden aus den PBMCs der Probanden Tregs (CD4+CD25+CD127low/-) sowie CD4+CD25-CD127- Zellen isoliert und deren Funktionsfähigkeit durch die Untersuchung ihrer Suppressionsfunktion auf autologe Effektor-Lymphozyten analysiert. Die Zellen wurden mittels verschiedener Zytokin-Cocktails in Richtung Treg sowie in Richtung Th17-Zellen polarisiert; anschließend wurde die Funktionsfähigkeit der polarisierten Zellen in Suppression-Assays gemessen.
Wir konnten zeigen, dass die CD4+CD25+CD127low/- Zellen Tregs mit der Fähigkeit zur Suppression der Proliferation autologer Effektor-Lymphozyten waren. Bei den CD4+CD25-CD127-Zellen handelte es sich um T-Lymphozyten ohne Suppressionsfunktion. Nach Stimulation der CD4+CD25-CD127-Zellen mit dem Treg-Cocktail zeigten die Zellen eine mit den Tregs vergleichbare Suppressionsfunktion.
Mit dieser Studie haben wir eine aktuelle methodische Quelle für die Untersuchung von Phänotyp und Funktion regulatorischer T-Zellen sowie für die Stimulation peripherer T-Lymphozyten hin zu Tregs geschaffen, die als Basis für Folgeversuche dienen soll, in denen Zellen von Patienten mit Autoimmunkrankheiten untersucht werden sollen. Da sich die Inflammation bei Autoimmunerkrankungen insbesondere in den betroffenen Geweben abspielt, wäre eine Studie anzustreben, in der aus dem Blut isolierte T-Lymphozyten den Zellen aus den entzündeten Geweben gegenübergestellt werden. Ergänzend sollte eine Phänotypisierung der Tregs und der CD4+CD25-CD127- Zellen nach der Zytokin-Stimulation erfolgen.
Zusammenfassend konnte die Plastizität peripherer T-Lymphozyten in Richtung Treg gezeigt werden. Besonders hervorzuheben ist die bislang wenig untersuchte Zellpopulation der CD4+CD25-CD127- Zellen, die eine vielversprechende Zellpopulation für die in vitro Induktion von Tregs darstellt.
Background
Juvenile idiopathic arthritis (JIA) is often accompanied by pathomorphological changes to the temporomandibular joint (TMJ). By analyzing orthodontical orthopantomograms of JIA patients the aims of the study were a) classification of condyle changes, b) quantification of bony asymmetries of condylar destruction and c) detection of relationships between disease duration and TMJ-involvement.
Patients/Methods
46 caucasian JIA-patients (28 female; 18 male; < 16.0 years) were enrolled, each joint (n = 92) was morphologically assessed by means of orthopantomogram, quantitatively analysed and compared with duration of general disease. Condyle morphology was assessed using the Billiau scale for severity of destruction [1]. The quantitative analysis was based on ratios of condyle, ramus and mandible height.
Results
Patients were divided into groups (Group I – slightly affected, n = 36; Billiau severity 0–2; condyle findings: X-ray normal, condyle erosions, condylar flattening; Group II – severely affected, N = 10; Billiau severity 3–4; condyle findings: condylar flattenings and erosions, unilateral/bilateral complete loss of condyles), based on morphological analysis of condylar destruction. Duration of disease was significantly longer in Group II (8.9 ± 5.2 years) than in Group I (4.6 ± 4.7 years). Asymmetries of condyle, ramus and mandible height, quantitatively analysed by contralateral comparison, were significantly more marked in patients of Group II than of Group I.
Conclusions
Orthopantomogram imaging can be used in orthodontics clinical routine to detect TMJ-pathologies and is an important reference for monitoring progression of JIA. Classification into severe and slightly affected TMJ is possible by analysis of condylar pathomorphology. An association between degree of destruction, extent of lower jaw asymmetry and disease duration is suggested by the results.