2% (F2, p=0.07); suggesting NK killing & anti fibrotic responses in early stages. CD56dim CD107a was unchanged (19.6±2.1%) within advanced fibrosis (F3-F4 cases, p=ns); suggesting NK impairment in advanced disease. Compared
to 68.6±8% in healthy volunteers, insulin receptors expressions found reduced to 48.4±3.3 – 52.5±2.5% in all stages of NAFLD CD56dim population (P<0.05); suggesting NK cell insulin resistance mediates impairment in advanced Dorsomorphin mouse stages. NAFLD CD56dim population showed lower F-Ac-tin (from 34±7.1 in healthy donors to 15.4±1.9% in NAFLD cases, p=0.03) and mTOR expressions (from 96.9±2.3 to 24.9±6.4%, respectively, p=0.001); suggesting F-Actin and mTOR to mediate NK killing. In vitro NK cultures with insulin incubations significantly unleashed the CD107a to increase NK killing in low fibrosis. This response attenuated in the insulin resistance NK cells of advanced
disease. Insulin activation of NK cells blocked by Rapamune administration; learn more suggesting insulin to increase NK activity via IR receptor in an mTOR mediated pathway that is prevented in insulin resistance. Conclusions: NAFLD NK cells exert insulin resistance and impairment, mainly the CD56Dim cytolytic population. Insulin resistance a result of metabolic modifications blocks insulin induced NK activity, via an mTOR dependent F-Actin scaffolding proteins. This pathway is indicating a new cellular pathway through which NK cells contribute to the NAFLD progression. Disclosures: The following people have nothing to disclose: Staurosporine solubility dmso Johnny Amer, Sarit Doron, Ahmad Salhab, Rifaat Safadi C-Myc has pleiotropic effects on proliferation, cell cycle control, differentiation and metabolism. Previous studies have specifically shown that c-Myc expression promotes transition from G0/G1 to S phase by regulating several networks of genes in mice after 2/3partial hepatectomy(PH). Contrary however, several studies have also shown that c-Myc appears to be dispensable for normal liver growth during the postnatal period, restoration of liver mass following PH and recovery from fasting. Aim of
this study was to clarify the role of c-Myc in liver regeneration during chronic liver injury. Mdr2-/— mice were crossed with c-Mycfl/flAlbCre+-mice to specifically delete c-Myc in hepatocytes. To induce liver regeneration, PH and hepatocyte transplantations were performed. Livers were harvested for immunhistochemical and biochemical analysis at several time points following PH. Hepatocyte transplantations were performed with immune-suppressed Fah-/—mice. Livers were harvested 8 weeks after transplantation. Mdr2-/-c-MycΔ/Δ mice developed significantly more severe liver injury compared to c-Myc WT littermates. Despite increased liver injury, baseline liver regeneration was however similar between Mdr2-/-c-MycA/A and Mdr2-/-c-Mycfl/fl mice. Following PH, liver regeneration proceeds in Mdr2-/-c-Mycfl/ fl mice similar to WT mice.