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Interleukin (IL)-18 plays an important role in the pathogenesis of several liver diseases as well as Fas-mediated apoptosis. However, the effects of IL-18 on Fas-mediated liver injury have not been well elucidated. Therefore, we examined the effects of IL-18 on Fas-mediated apoptosis in in vitro and in vivo experiments. We found that recombinant IL-18 protected mouse hepatocellular carcinoma cell lines, BNL5, from Fas-mediated apoptosis in a dose-dependent manner with up-regulation of both nuclear factor (NF) kappaB and X-linked inhibitors of apoptosis (XIAP). IL-18 transgenic (Tg) mice were also protected from Fas-mediated liver injury and this was further confirmed by histological study and TUNEL staining. In IL-18 Tg mice, up-regulation of XIAP and down-regulation of caspase 3 were observed after injection of anti-Fas, which was consistent with the in vitro findings. These results suggest that IL-18 suppresses Fas-mediated apoptosis of hepatocytes by up-regulation of NFkappaB and XIAP, following inhibition of caspase-3 activity. This observation raises the possibility that IL-18 could be a therapeutic strategy for Fas-mediated liver injury as a negative regulator of XIAP.

Protective role of interleukin-18 against Fas-mediated liver injury