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Learn MoreObesity-associated lipid overload triggers non-alcoholic fatty liver diseases (NAFLD), which in part may be driven by alterations of regulatory transcription networks and hepatocyte-selective epigenomes. Here we demonstrate that G protein pathway suppressor 2 (GPS2), a subunit of the nuclear receptor corepressor (NCOR)/ histone deacetylase 3 (HDAC3) complex, is a central component of such networks and accelerates the progression of non-alcoholic steatohepatitis (NASH). In hepatocyte-specific Gps2 knockout mice, loss of GPS2 alleviated the development of diet-induced steatosis and fibrosis and caused activation of lipid catabolic genes. By determining differential cistromes, epigenomes and transcriptomes in wild-type, single and double knockout mice, we identified the lipid-sensing nuclear receptor PPARa as a direct target of GPS2. We also provide evidence that in hepatocytes, unlike in macrophages, GPS2 acts in concert with the NCOR subunit of the corepressor complex. By analyzing the liver transcriptomes of human patients, we found that GPS2 expression positively correlated with the expression of NASH/fibrosis signature genes. Collectively, our data suggest that the GPS2-PPARa partnership in hepatocytes may influence the development of NASH/fibrosis in mice and in humans. SOURCE: Rongrong Fan (rongrong.fan@ki.se) - Karolinska Institutet
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