title: Chromatin remodeling complex interacts with ADD1/SREBP1c to mediate insulin-dependent regulation of gene expression.
abstract: Insulin plays a critical role in whole-body energy homeostasis by regulating lipid and glucose metabolism. In fat and liver tissues, ADD1/SREBP1c is a key transcription factor to mediate insulin-dependent regulation of gene expression. Although transcriptional and proteolytic activation of ADD1/SREBP1c has been studied intensively, the mechanism by which insulin regulates expression of its target genes with ADD1/SREBP1c at the chromatin level is unclear. Here, we reveal that SWI/SNF chromatin remodeling factors interact with the ADD1/SREBP1c and actively regulate insulin-dependent gene expression. Insulin enhanced recruitment of SWI/SNF chromatin remodeling factors to its target gene promoters with concomitant changes in the chromatin structures as well as gene expression. Furthermore, in vivo overexpression of BAF155/SRG3, a component of the SWI/SNF complex, substantially promoted insulin target gene expression and insulin sensitivity. Taken together, our results suggest that the SWI/SNF chromatin remodeling complexes confer not only insulin-dependent gene expression but also insulin sensitivity in vivo via interaction with ADD1/SREBP1c.
authors.affiliation: Department of Biological Sciences, Seoul National University, San 56-1, Sillim-Dong, Kwanak-Gu, Seoul 151-742, South Korea.
authors.forename: Yun Sok
authors.initials: YS
authors.lastname: Lee
authors.forename: Dong Hyun
authors.initials: DH
authors.lastname: Sohn
authors.forename: Daehee
authors.initials: D
authors.lastname: Han
authors.forename: Han-Woong
authors.initials: HW
authors.lastname: Lee
authors.forename: Rho Hyun
authors.initials: RH
authors.lastname: Seong
authors.forename: Jae Bum
authors.initials: JB
authors.lastname: Kim
mesh_terms: D041721:3T3-L1 Cells; D017667:Adipocytes / Q000378:metabolism; D000818:Animals; D002843:Chromatin / Q000378:metabolism*; D042002:Chromatin Assembly and Disassembly; D002868:Chromosomal Proteins, Non-Histone / Q000378:metabolism*; D005786:Gene Expression Regulation; D007328:Insulin / Q000494:pharmacology / Q000502:physiology*; D008297:Male; D051379:Mice; D008822:Mice, Transgenic; D011401:Promoter Regions, Genetic; D051780:Sterol Regulatory Element Binding Protein 1 / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism
chemical_list: D002843:Chromatin; D002868:Chromosomal Proteins, Non-Histone; D007328:Insulin; C491090:Smarcc1 protein, mouse; D051780:Sterol Regulatory Element Binding Protein 1; D014157:Transcription Factors