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RIPK1 suppresses a TRAF2-dependent pathway to liver cancer


Schneider, AT; Gautheron, J; Feoktistova, M; Roderburg, C; Loosen, SH; Roy, S; Benz, F; Schemmer, P; Buchler, MW; Nachbur, U; Neumann, UP; Tolba, R; Luedde, M; Zucman-Rossi, J; Panayotova-Dimitrova, D; Leverkus, M; Preisinger, C; Tacke, F; Trautwein, C; Longerich, T; Vucur, M; Luedde, T
2017-12-01
Cancer Cell
Journal Article
31
1
94-109
Receptor-interacting protein kinase 1 (RIPK1) represents an essential signaling node in cell death and inflammation. Ablation of Ripk1 in liver parenchymal cells (LPC) did not cause a spontaneous phenotype, but led to tumor necrosis factor (TNF)-dependent hepatocyte apoptosis and liver injury without affecting inducible nuclear factor kappaB (NF-kappaB) activation. Loss of Ripk1 induced the TNF-dependent proteasomal degradation of the E3-ligase, TNF receptor-associated factor 2 (TRAF2), in a kinase-independent manner, thereby activating caspase-8. Moreover, loss of both Ripk1 and Traf2 in LPC not only resulted in caspase-8 hyperactivation but also impaired NF-kappaB activation, promoting the spontaneous development of hepatocellular carcinoma. In line, low RIPK1 and TRAF2 expression in human HCCs was associated with an unfavorable prognosis, suggesting that RIPK1 collaborates with TRAF2 to inhibit murine and human hepatocarcinogenesis.
Cell Press
Cell Signalling and Cell Death
10.1016/j.ccell.2016.11.009
28017612
Refer to copyright notice on published article.

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Creation Date 2017-05-24 04:06:19 Last Modified 2017-05-26 03:03:09