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The pseudokinase MLKL mediates programmed hepatocellular necrosis independently of RIPK3 during hepatitis
- Source :
- Journal of Clinical Investigation. November 1, 2016, p4346, 15 p.
- Publication Year :
- 2016
-
Abstract
- Although necrosis and necroinflammation are central features of many liver diseases, the role of programmed necrosis in the context of inflammation-dependent hepatocellular death remains to be fully determined. Here, we have demonstrated that the pseudokinase mixed lineage kinase domain-like protein (MLKL), which plays a key role in the execution of receptor-interacting protein (RIP) kinase-dependent necroptosis, is upregulated and activated in human autoimmune hepatitis and in a murine model of inflammation-dependent hepatitis. Using genetic and pharmacologic approaches, we determined that hepatocellular necrosis in experimental hepatitis is driven by an MLKL-dependent pathway that occurs independently of RIPK3. Moreover, we have provided evidence that the cytotoxic activity of the proinflammatory cytokine IFN-γ in hepatic inflammation is strongly connected to induction of MLKL expression via activation of the transcription factor STAT1. In summary, our results reveal a pathway for MLKL-dependent programmed necrosis that is executed in the absence of RIPK3 and potentially drives the pathogenesis of severe liver diseases.<br />Introduction Although the liver is an organ of remarkable regenerative capacity, cell death-related compensatory tissue injury responses commonly culminate in fibrosis and eventually cirrhosis, a major cause of morbidity worldwide. [...]
Details
- Language :
- English
- ISSN :
- 00219738
- Database :
- Gale General OneFile
- Journal :
- Journal of Clinical Investigation
- Publication Type :
- Academic Journal
- Accession number :
- edsgcl.470369477
- Full Text :
- https://doi.org/10.1172/JCI87545