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

Abstract：

: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.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Li S,Ogawa W,Emi A,Hayashi K,Senga Y,Nomura K,Hara K,Yu D,Kasuga M

doi

10.1016/j.bbrc.2011.07.038

subject

Has Abstract

pub_date

2011-08-26 00:00:00

pages

197-202

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(11)01257-5

journal_volume

412

pub_type

杂志文章

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