Hepatitis C virus NS5A protein increases hepatic lipid accumulation via induction of activation and expression of PPARgamma

Steatosis is an established risk factor for disease progression in cases of chronic hepatitis C. Recently it was demonstrated that Hepatitis C virus (HCV) core and non-structural (NS)2 proteins (NS2) induce lipid accumulation in hepatic cells. However, it has yet to be determined whether other HCV proteins are associated with lipid metabolism. The NS5A augmented the transcriptional activity and gene expression of PPAR gamma. Furthermore, NS5A increased the ability to recruit the transcriptional coactivator PGC-1s to the PPRE with PPAR gamma, as well as the interaction with PPAR gamma 2 and PGC-1 alpha. Our results indicate that NS5A may exploit multiple strategies that enhance PPAR gamma-induced lipid accumulation. Structured summary: MINT-7229685: PPAR gamma 2 (uniprotkb: P37231-2) physically interacts (MI: 0914) with PGC1 alpha (uniprotkb: Q9UBK2) by pull down (MI: 0096) MINT-7229712: PPAR gamma 2 (uniprotkb: P37231-2) physically interacts (MI: 0914) with NS5A (uniprotkb: P26662) by pull down ( MI: 0096) MINT-7229698: PPAR gamma 2 (uniprotkb: P37231-2) physically interacts (MI: 0914) with PGC1 alpha (uniprotkb: Q9UBK2) by anti tag coimmunoprecipitation ( MI: 0007) MINT-7229731: PPAR gamma 2 (uniprotkb: P37231-2) physically interacts (MI: 0914) with NS5A (uniprotkb: P26662) by anti tag coimmunoprecipitation (MI: 0007) (C) 2009 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.