Gene interactions and pathways from curated databases and text-mining
Biochem Biophys Res Commun 2011, PMID: 21806970

Role of S6K1 in regulation of SREBP1c expression in the liver.

Li, Shuying; Ogawa, Wataru; Emi, Aki; Hayashi, Kumiko; Senga, Yoko; Nomura, Kazuhiro; Hara, Kenta; Yu, Demin; Kasuga, Masato

The transcription factor sterol regulatory element-binding protein 1c (SREBP1c) plays an important role in the control of fatty acid metabolism in the liver. Evidence suggests that mammalian target of rapamycin (mTOR) complex 1 (mTORC1) contributes to the regulation of SREBP1c expression, but signaling downstream of mTORC1 remains unclear. We have now shown that medium rich in branched-chain amino acids stimulates expression of the SREBP1c gene in cultured hepatocytes in a manner sensitive both to rapamycin, a pharmacological inhibitor of mTORC1, and to a short hairpin RNA (shRNA) specific for S6 kinase 1 (S6K1), a downstream effector of mTORC1. The phosphorylation of S6K1 was increased in the liver of obese db/db mice. Furthermore, depletion of hepatic S6K1 in db/db mice with the use of an adenovirus vector encoding S6K1 shRNA resulted in down-regulation of SREBP1c gene expression in the liver as well as a reduced hepatic triglyceride content and serum triglyceride concentration. These results thus suggest that S6K1 regulates SREBP1c expression both in cultured hepatocytes and in mouse liver, and that increased hepatic activity of S6K1 contributes at least in part to the pathogenesis of obesity-induced hepatic steatosis and hypertriglyceridemia.

Diseases/Pathways annotated by Medline MESH: Fatty Liver, Hypertriglyceridemia, Obesity
Document information provided by NCBI PubMed

Text Mining Data

SREBP1c ⊣ S6K1: " Role of S6K1 in regulation of SREBP1c expression in the liver "

SREBP1c ⊣ mammalian target of rapamycin (mTOR): " Evidence suggests that mammalian target of rapamycin (mTOR) complex 1 ( mTORC1 ) contributes to the regulation of SREBP1c expression, but signaling downstream of mTORC1 remains unclear "

SREBP1c ⊣ S6K1: " Furthermore, depletion of hepatic S6K1 in db/db mice with the use of an adenovirus vector encoding S6K1 shRNA resulted in down-regulation of SREBP1c gene expression in the liver as well as a reduced hepatic triglyceride content and serum triglyceride concentration "

SREBP1c → S6K1: " These results thus suggest that S6K1 regulates SREBP1c expression both in cultured hepatocytes and in mouse liver, and that increased hepatic activity of S6K1 contributes at least in part to the pathogenesis of obesity induced hepatic steatosis and hypertriglyceridemia "

Manually curated Databases

No curated data.