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Institut
- Abteilung für Molekulare Innere Medizin (in der Medizinischen Klinik und Poliklinik II) (67) (entfernen)
Sonstige beteiligte Institutionen
TNF wird zunächst als TypII-Transmembranprotein (mTNF) gebildet und erst anschließend durch spezifische Spaltung durch die Metalloprotease TACE zum löslichen Zytokin sTNF prozessiert. Da mTNF der alleinige Hauptaktivator des TNFR2 ist und sich bisherige Untersuchungen zum TNF-Signaling weitgehend auf sTNF konzentrierten, ist vergleichsweise wenig über TNFR2-vermittelte Signaltransduktion bekannt. An TNFR1 sind dagegen beide TNF-Varianten bioaktiv. Trotz intensiver Untersuchung des TNFR1-Signaling sind jedoch auch hier viele Fragen noch unbeantwortet. Derzeit existieren deshalb zum TNFR1-Signaling zwei verschiedene Modellvorstellungen nebeneinander. Im ersten Modell, dem Modell der Kompartmentalisation, bindet TRADD erst nach Rezeptorinternalisierung an TNFR1, genauso wie FADD und Caspase-8. Die Rezeptorinternalisierung nach Ligandenbindung gilt hier daher als Voraussetzung für die TRADD-Rekrutierung und für die Apoptoseinduktion. Im zweiten Modell, dem Modell zweier sequentiell arbeitender Signalkomplexe, bindet TRADD dagegen bereits im membrangebundenen Signalkomplex an TNFR1. Anschließend dissoziiert TRADD vom Rezeptor, um im Zytoplasma einen zweiten, apoptoseinduzierenden Komplex mit FADD und Caspase-8 zu formen. Um mehr über TNFR2 zu erfahren und um das TNFR1-Signaling besser zu verstehen, wurden in dieser Arbeit die Signaltransduktion und die Geninduktion über TNFR1 und TNFR2 nach Stimulation mit mTNF untersucht. Ziel war es letztlich, eine Methode zu etablieren, die es erlaubt, membrangebundene TNFR1- und TNFR2-Signalkomplexe getrennt zu isolieren. Dazu wurden zunächst nicht zu sTNF spaltbare TNFR1- bzw. TNFR2-spezifische mTNF-Varianten mit GST-Tag hinsichtlich Rezeptorbindung und Rezeptoraktivierung näher charakterisiert. Die selektive Bindung dieser mTNF-Varianten an TNFR1 bzw. TNFR2 konnte gezeigt werden. Auch der Nachweis ihre Funktionalität in Versuchen zur IL8-Induktion war möglich. Mit Hilfe der TNFR1-spezifischen mTNF-Variante gelang im GST-Fishing die Koimmunopräzipitation von TNFR1, TRADD und TRAF2 und damit die Isolierung des membrangebundenen Signalkomplexes des TNFR1. Mit Hilfe einer TNFR2-spezifischen Variante konnten dagegen TNFR2 und TRAF2 koimmunopräzipitiert werden, TRADD dagegen nicht. Somit ließen sich mit den rezeptorspezifischen Varianten von mTNF die Rezeptorsignalkomplexe des TNFR1 und TNFR2 getrennt isolieren. Interessant war dabei insbesondere die TRADD-Rekrutierung an TNFR1 im membrangebundenen TNFR1-Signalkomplex. Da die Internalisierung von TNFR1 nach mTNF-Stimulation schwer vorstellbar ist, bindet TRADD offensichtlich an TNFR1, ohne dass eine Rezeptorinternalisierung Voraussetzung wäre. Damit erscheint das Modell der Kompartmentalisation zumindest für mTNF wenig plausibel. Dagegen sind die bisher für mTNF erhobenen Daten mit einer TRADD-Dissoziation vom Rezeptor vereinbar, weshalb ein Modell zweier sequentiell arbeitender Signalkomplexe durchaus auch für mTNF Gültigkeit besitzen könnte.
TNFR1 is a crucial regulator of NF‐ĸB‐mediated proinflammatory cell survival responses and programmed cell death (PCD). Deregulation of TNFα‐ and TNFR1‐controlled NF‐ĸB signaling underlies major diseases, like cancer, inflammation, and autoimmune diseases. Therefore, although being routinely used, antagonists of TNFα might also affect TNFR2‐mediated processes, so that alternative approaches to directly antagonize TNFR1 are beneficial. Here, we apply quantitative single‐molecule localization microscopy (SMLM) of TNFR1 in physiologic cellular settings to validate and characterize TNFR1 inhibitory substances, exemplified by the recently described TNFR1 antagonist zafirlukast. Treatment of TNFR1‐mEos2 reconstituted TNFR1/2 knockout mouse embryonic fibroblasts (MEFs) with zafirlukast inhibited both ligand‐independent preligand assembly domain (PLAD)‐mediated TNFR1 dimerization as well as TNFα‐induced TNFR1 oligomerization. In addition, zafirlukast‐mediated inhibition of TNFR1 clustering was accompanied by deregulation of acute and prolonged NF‐ĸB signaling in reconstituted TNFR1‐mEos2 MEFs and human cervical carcinoma cells. These findings reveal the necessity of PLAD‐mediated, ligand‐independent TNFR1 dimerization for NF‐ĸB activation, highlight the PLAD as central regulator of TNFα‐induced TNFR1 oligomerization, and demonstrate that TNFR1‐mEos2 MEFs can be used to investigate TNFR1‐antagonizing compounds employing single‐molecule quantification and functional NF‐ĸB assays at physiologic conditions.
Background
40–50% of patients with colorectal cancer (CRC) will develop liver metastases (CRLM) during the course of the disease. One third of these patients will additionally develop pulmonary metastases.
Methods
137 consecutive patients with CRLM, were analyzed regarding survival data, clinical, histological data and treatment. Results were stratified according to the occurrence of pulmonary metastases and metastases resection.
Results
39% of all patients with liver resection due to CRLM developed additional lung metastases. 44% of these patients underwent subsequent pulmonary resection. Patients undergoing pulmonary metastasectomy showed a significantly better five-year survival compared to patients not qualified for curative resection (5-year survival 71.2% vs. 28.0%; p = 0.001). Interestingly, the 5-year survival of these patients was even superior to all patients with CRLM, who did not develop pulmonary metastases (77.5% vs. 63.5%; p = 0.015). Patients, whose pulmonary metastases were not resected, were more likely to redevelop liver metastases (50.0% vs 78.6%; p = 0.034). However, the rate of distant metastases did not differ between both groups (54.5 vs.53.6; p = 0.945).
Conclusion
The occurrence of colorectal lung metastases after curative liver resection does not impact patient survival if pulmonary metastasectomy is feasible. Those patients clearly benefit from repeated resections of the liver and the lung metastases.
Liganden und Rezeptoren der TNF-Familie regulieren eine Vielzahl zellulärer Prozesse, darunter Apoptose und Immunprozesse. TNF-Liganden kommen in Form löslicher und membranständiger trimerer Moleküle vor, wobei die trimere Organisation durch die konservierte THD vermittelt wird. Im Gegensatz zu den membranständigen Molekülen können lösliche TNF-Liganden nicht immer an ihren TNF-Rezeptor binden oder ihn effektiv aktivieren. Für zwei solcher inaktiven TNF-Liganden, nämlich TRAIL und CD95L, konnte gezeigt werden, dass durch sekundäre Oligomerisierung oder durch artifizielle Herstellung einer Membranständigkeit mittels Antikörperdomänen gegen zelloberflächenexprimierte Proteine hochaktive Ligandenvarianten generiert werden können. Inwieweit sich diese Verfahren auf die T-Zell-kostimulatorischen TNF-Liganden OX40L, 41BBL und CD27L übertragen lassen, wurde in dieser Arbeit untersucht. Lösliche Flag- und Flag-TNC-Varianten von OX40L und 41BBL zeigten eine gute Bindung an die Rezeptoren OX40 und 41BB. Die lösliche Variante Flag-CD27L konnte nicht an ihren Rezeptor CD27 binden. Dies war aber nach Einführung der trimerstabilisierenden TNC-Domäne möglich. Eine effektive Aktivierung ihres Rezeptors, nachgewiesen durch Analyse der IL8-Induktion, bewirkten die löslichen TNF-Ligandenvarianten nur nach sekundärer Oligomerisierung mittels des Flag-spezifischen Antikörpers M2. Eine ähnlich gute TNFR-Aktivierung ließ sich durch Einführung der hexamerisierenden Fc-Domäne erzielen. Fc-Flag-OX40L und Fc-Flag-41BBL induzierten bereits ohne sekundäre Quervernetzung effektiv IL8. Die Hexamerisierung alleine reichte für die lösliche CD27L-Variante nicht aus, hier war zusätzlich zur Fc- wiederum auch die TNC-Domäne erforderlich, um die Bindung an CD27 und eine schwache IL8-Induktion zu erzielen. Für die FAP-bindenden Fusionsproteine antiFAP-Flag- OX40L, antiFAP-Flag-41BBL und antiFAP-Flag-TNC-CD27L war die Bindung an OX40, 41BB und CD27 sowie an FAP nachweisbar. Erst durch die artifizielle Membranständigkeit nach Bindung an FAP konnten diese Fusionsproteine über ihren Rezeptor effektiv IL8 induzieren. Zusammenfassend ließ sich somit zeigen, dass sich schwach oder nicht aktive lösliche Ligandenvarianten von OX40L und 41BBL durch sekundäre Oligomerisierung, durch die Fc-Hexamerisierungsdomäne und durch artifizielle Membranständigkeit in hochaktive Liganden verwandeln lassen. Lösliche CD27L-Varianten benötigen zusätzlich die trimerstabilisierende TNC-Domäne, um CD27 binden und aktivieren zu können. Für das bessere Verständnis der Ligand-Rezeptor-Interaktionen wurden zusätzlich OX40L-, 41BBL- und CD27L-Fusionsproteine mit der hochaktiven Gaussia princeps Luziferase (GpL) generiert, um Gleichgewichtsbindungs-, Dissoziationsstudien und homologe Kompetitionsassays durchführen zu können. Für die Fusionsproteine GpL-Flag-TNC-OX40L, GpL-Flag-TNC-41BBL und GpL-Flag-TNC-CD27L konnte gezeigt werden, dass die IL8-Induktion nicht von der Rezeptorbelegung abhängt, sondern von der sekundären Oligomerisierung, da bei gleicher Rezeptorbelegung durch sekundär quervernetzte TNF-Liganden mehr IL8 induziert wird, die Rezeptoraktivierung also qualitativ besser sein muss.
Fibroblast growth factor-inducible 14 (Fn14) is a member of the tumor necrosis factor (TNF) receptor superfamily (TNFRSF) and is activated by its ligand TNF-like weak inducer of apoptosis (TWEAK). The latter occurs as a homotrimeric molecule in a soluble and a membrane-bound form. Soluble TWEAK (sTWEAK) activates the weakly inflammatory alternative NF-κB pathway and sensitizes for TNF-induced cell death while membrane TWEAK (memTWEAK) triggers additionally robust activation of the classical NF-κB pathway and various MAP kinase cascades. Fn14 expression is limited in adult organisms but becomes strongly induced in non-hematopoietic cells by a variety of growth factors, cytokines and physical stressors (e.g., hypoxia, irradiation). Since all these Fn14-inducing factors are frequently also present in the tumor microenvironment, Fn14 is regularly found to be expressed by non-hematopoietic cells of the tumor microenvironment and most solid tumor cells. In general, there are three possibilities how the tumor-Fn14 linkage could be taken into consideration for tumor therapy. First, by exploitation of the cancer associated expression of Fn14 to direct cytotoxic activities (antibody-dependent cell-mediated cytotoxicity (ADCC), cytotoxic payloads, CAR T-cells) to the tumor, second by blockade of potential protumoral activities of the TWEAK/Fn14 system, and third, by stimulation of Fn14 which not only triggers proinflammtory activities but also sensitizes cells for apoptotic and necroptotic cell death. Based on a brief description of the biology of the TWEAK/Fn14 system and Fn14 signaling, we discuss the features of the most relevant Fn14-targeting biologicals and review the preclinical data obtained with these reagents. In particular, we address problems and limitations which became evident in the preclinical studies with Fn14-targeting biologicals and debate possibilities how they could be overcome.
Background:
Clinical reasoning in Neurology is based on general associations which help to deduce the site of the lesion. However, even “golden principles” may occasionally be deceptive. Here, we describe the case of subacute flaccid tetraparesis due to motor cortical lesions. To our knowledge, this is the first report to include an impressive illustration of nearly symmetric motor cortical involvement of encephalitis on brain MRI.
Case presentation:
A 51 year old immunocompromized man developed a high-grade pure motor flaccid tetraparesis over few days. Based on clinical presentation, critical illness polyneuromyopathy was suspected. However, brain MRI revealed symmetrical hyperintensities strictly limited to the subcortical precentral gyrus. An encephalitis, possibly due to CMV infection, turned out to be the most likely cause.
Conclusion:
While recognition of basic clinical patterns is indispensable in neurological reasoning, awareness of central conditions mimicking peripheral nervous disease may be crucial to detect unsuspected, potentially treatable conditions.
The cell—cell signaling gene CDH13 is associated with a wide spectrum of neuropsychiatric disorders, including attention-deficit/hyperactivity disorder (ADHD), autism, and major depression. CDH13 regulates axonal outgrowth and synapse formation, substantiating its relevance for neurodevelopmental processes. Several studies support the influence of CDH13 on personality traits, behavior, and executive functions. However, evidence for functional effects of common gene variation in the CDH13 gene in humans is sparse. Therefore, we tested for association of a functional intronic CDH13 SNP rs2199430 with ADHD in a sample of 998 adult patients and 884 healthy controls. The Big Five personality traits were assessed by the NEO-PI-R questionnaire. Assuming that altered neural correlates of working memory and cognitive response inhibition show genotype-dependent alterations, task performance and electroencephalographic event-related potentials were measured by n-back and continuous performance (Go/NoGo) tasks. The rs2199430 genotype was not associated with adult ADHD on the categorical diagnosis level. However, rs2199430 was significantly associated with agreeableness, with minor G allele homozygotes scoring lower than A allele carriers. Whereas task performance was not affected by genotype, a significant heterosis effect limited to the ADHD group was identified for the n-back task. Heterozygotes (AG) exhibited significantly higher N200 amplitudes during both the 1-back and 2-back condition in the central electrode position Cz. Consequently, the common genetic variation of CDH13 is associated with personality traits and impacts neural processing during working memory tasks. Thus, CDH13 might contribute to symptomatic core dysfunctions of social and cognitive impairment in ADHD.