| Tumor necrosis factor α sensitizes primary murine hepatocytes to Fas/CD95-induced apoptosis in a Bim- and Bid-dependent manner. | |
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MedLine Citation:
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PMID: 20872776 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Fas/CD95 is a critical mediator of cell death in many chronic and acute liver diseases and induces apoptosis in primary hepatocytes in vitro. In contrast, the proinflammatory cytokine tumor necrosis factor α (TNFα) fails to provoke cell death in isolated hepatocytes but has been implicated in hepatocyte apoptosis during liver diseases associated with chronic inflammation. Here we report that TNFα sensitizes primary murine hepatocytes cultured on collagen to Fas ligand (FasL)-induced apoptosis. This synergism is time-dependent and is specifically mediated by TNFα. Fas itself is essential for the sensitization, but neither Fas up-regulation nor endogenous FasL is responsible for this effect. Although FasL is shown to induce Bid-independent apoptosis in hepatocytes cultured on collagen, the sensitizing effect of TNFα is clearly dependent on Bid. Moreover, both c-Jun N-terminal kinase activation and Bim, another B cell lymphoma 2 homology domain 3 (BH3)-only protein, are crucial mediators of TNFα-induced apoptosis sensitization. Bim and Bid activate the mitochondrial amplification loop and induce cytochrome c release, a hallmark of type II apoptosis. The mechanism of TNFα-induced sensitization is supported by a mathematical model that correctly reproduces the biological findings. Finally, our results are physiologically relevant because TNFα also induces sensitivity to agonistic anti-Fas-induced liver damage. Conclusion: Our data suggest that TNFα can cooperate with FasL to induce hepatocyte apoptosis by activating the BH3-only proteins Bim and Bid. (HEPATOLOGY 2011.). |
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Authors:
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Kathrin Schmich; Rebekka Schlatter; Nadia Corazza; Karine Sá Ferreira; Michael Ederer; Thomas Brunner; Christoph Borner; Irmgard Merfort |
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Publication Detail:
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Type: Journal Article Date: 2010-09-24 |
Journal Detail:
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Title: Hepatology (Baltimore, Md.) Volume: 53 ISSN: 1527-3350 ISO Abbreviation: Hepatology Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8302946 Medline TA: Hepatology Country: United States |
Other Details:
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Languages: eng Pagination: 282-92 Citation Subset: IM |
Copyright Information:
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Copyright © 2010 American Association for the Study of Liver Diseases. |
Affiliation:
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Department of Pharmaceutical Biology and Biotechnology, Albert Ludwigs University of Freiburg, Freiburg, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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