期刊
FEBS LETTERS
卷 584, 期 20, 页码 4330-4334出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.febslet.2010.09.027
关键词
SREBP-1c promoter; FoxO1; LXR alpha; Insulin
Recent studies have demonstrated that FoxO1 modulates the expression of SREBP-1c, but the exact mechanism remains unknown. Our results demonstrate that FoxO1 suppresses the SREBP-1c promoter transcriptional activity in HepG2 cells. This repression was independent of FoxO1 binding to the SREBP-1c promoter, but LXR responsive elements (LXREs) were crucial to this phenomenon. Moreover, FoxO1 also strongly inhibited the LXR alpha-mediated elevated transcription by SREBP-1c promoter. Electrophoretic mobility shift assay and chromatin immuno-precipitation further suggested the ability of FoxO1 to inhibit LXR alpha binding with the LXRE in the SREBP-c promoter. FoxO1-mediated suppression of SREBP-1c promoter activity could be partially alleviated by insulin. (C) 2010 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.
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