Remodeling of chromatin structure within the promoter is important for bmp-2-induced fgfr3 expression.
Fibroblast growth factor receptor 3 (FGFR3) plays an important role in cartilage development. Although upregulation of FGFR3 expression in response to bone morphogenetic protein-2 (BMP-2) has been reported, the molecular mechanisms remain unknown. In this study, we used in vivo approaches to characterize BMP-2-induced alterations in the chromatin organization of the FGFR3 core promoter. Chromatin immunoprecipitation analysis demonstrated that the binding of Brg1, a component of the SWI/SNF remodeling complex, may selectively remodel a chromatin region (encompassing nucleotide -90 to +35), uncovering the transcription start site and three Sp1-binding sites, as revealed by nuclease digestion hypersensitivity assays. We then showed an increase in the association of Sp1 with the proximal promoter, followed by the recruitment of p300, resulting in a change of the histone 'code', such as in phosphorylation and methylation. Collectively, our study results suggest a model for BMP-2-induced FGFR3 expression in which the core promoter architecture is specifically regulated.
Sun
Fenyong
F
Institute of Genetic Engineering, Jinan University, PR China.
Chen
Qiongyu
Q
Yang
Songhai
S
Pan
Qiuhui
Q
Ma
Ji
J
Wan
Yang
Y
Chang
Chih-Hao
CH
Hong
An
A
D000818:Animals; D001665:Binding Sites; D055396:Bone Morphogenetic Protein 2 / Q000494:pharmacology*; D002460:Cell Line; D002843:Chromatin / Q000737:chemistry* / Q000187:drug effects; D042002:Chromatin Assembly and Disassembly; D051548:Histone Acetyltransferases / Q000378:metabolism; D006657:Histones / Q000378:metabolism; D007700:Kinetics; D051379:Mice; D009707:Nucleosomes / Q000737:chemistry / Q000187:drug effects; D011401:Promoter Regions, Genetic; D014176:Protein Biosynthesis; D051498:Receptor, Fibroblast Growth Factor, Type 3 / Q000096:biosynthesis / Q000235:genetics*; D016329:Sp1 Transcription Factor / Q000378:metabolism; D014157:Transcription Factors / Q000378:metabolism; D024363:Transcription Initiation Site; D015533:Transcriptional Activation; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
D055396:Bone Morphogenetic Protein 2; D002843:Chromatin; D006657:Histones; D009707:Nucleosomes; D016329:Sp1 Transcription Factor; D014157:Transcription Factors; D051548:Histone Acetyltransferases; D051498:Receptor, Fibroblast Growth Factor, Type 3; D048051:p38 Mitogen-Activated Protein Kinases