Find in Library
Search millions of books, articles, and more
Indexed Open Access Databases
RIPK1 in Liver Parenchymal Cells Limits Murine Hepatitis during Acute CCl<sub>4</sub>-Induced Liver Injury
oleh: Huma Hameed, Muhammad Farooq, Céline Vuillier, Claire Piquet-Pellorce, Annaïg Hamon, Marie-Thérèse Dimanche-Boitrel, Michel Samson, Jacques Le Seyec
Format: | Article |
---|---|
Diterbitkan: | MDPI AG 2022-07-01 |
Deskripsi
Some life-threatening acute hepatitis originates from drug-induced liver injury (DILI). Carbon tetrachloride (CCl<sub>4</sub>)-induced acute liver injury in mice is the widely used model of choice to study acute DILI, which pathogenesis involves a complex interplay of oxidative stress, necrosis, and apoptosis. Since the receptor interacting protein kinase-1 (RIPK1) is able to direct cell fate towards survival or death, it may potentially affect the pathological process of xenobiotic-induced liver damage. Two different mouse lines, either deficient for <i>Ripk1</i> specifically in liver parenchymal cells (<i>Ripk1</i><sup>LPC-KO</sup>) or for the kinase activity of RIPK1 (<i>Ripk1</i><sup>K45A</sup>, kinase dead), plus their respective wild-type littermates (<i>Ripk1</i><sup>fl/fl</sup>, <i>Ripk1</i><sup>wt/wt</sup>), were exposed to single toxic doses of CCl<sub>4</sub>. This exposure led in similar injury in <i>Ripk1</i><sup>K45A</sup> mice and their littermate controls. However, <i>Ripk1</i><sup>LPC-KO</sup> mice developed more severe symptoms with massive hepatocyte apoptosis as compared to their littermate controls. A pretreatment with a TNF-α receptor decoy exacerbated liver apoptosis in both <i>Ripk1</i><sup>fl/fl</sup> and <i>Ripk1</i><sup>LPC-KO</sup> mice. Besides, a FasL antagonist promoted hepatocyte apoptosis in <i>Ripk1</i><sup>fl/fl</sup> mice but reduced it in <i>Ripk1</i><sup>LPC-KO</sup> mice. Thus, the scaffolding properties of RIPK1 protect hepatocytes from apoptosis during CCl<sub>4</sub> intoxication. TNF-α and FasL emerged as factors promoting hepatocyte survival. These protective effects appeared to be independent of RIPK1, at least in part, for TNF-α, but dependent on RIPK1 for FasL. These new data complete the deciphering of the molecular mechanisms involved in DILI in the context of research on their prevention or cure.