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- W2134967933 abstract "Binding of 1α,25-dihydroxy vitamin D3 to the C-terminal ligand-binding domain (LBD) of its receptor (VDR) induces a conformational change that enables interaction of VDR with transcriptional coactivators such as members of the p160/SRC family or the DRIP (vitamin D receptor-interacting complex)/Mediator complex. These interactions are critical for VDR-mediated transcriptional enhancement of target genes. The p160/SRC members contain intrinsic histone acetyl transferase (HAT) activities that remodel chromatin at promoter regulatory regions, and the DRIP/Mediator complex may establish a molecular bridge between the VDR complex and the basal transcription machinery. Here, we have analyzed the rate of recruitment of these coactivators to the bone-specific osteocalcin (OC) gene in response to short and long exposures to 1α,25-dihydroxy vitamin D3. We report that in intact osteoblastic cells VDR, in association with SRC-1, rapidly binds to the OC promoter in response to the ligand. The recruitment of SRC-1 correlates with maximal transcriptional enhancement of the OC gene at 4 h and with increased histone acetylation at the OC promoter. In contrast to other 1α,25-dihydroxy vitamin D3-enhanced genes, binding of the DRIP205 subunit, which anchors the DRIP/Mediator complex to the VDR, is detected at the OC promoter only after several hours of incubation with 1α,25-dihydroxy vitamin D3, concomitant with the release of SRC-1. Together, our results support a model where VDR preferentially recruits SRC-1 to enhance bone-specific OC gene transcription. J. Cell. Physiol. 214: 740–749, 2008. © 2007 Wiley-Liss, Inc." @default.
- W2134967933 created "2016-06-24" @default.
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- W2134967933 date "2007-01-01" @default.
- W2134967933 modified "2023-10-17" @default.
- W2134967933 title "1α,25-dihydroxy vitamin D3-enhanced expression of the osteocalcin gene involves increased promoter occupancy of basal transcription regulators and gradual recruitment of the 1α,25-dihydroxy vitamin D3 receptor-SRC-1 coactivator complex" @default.
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- W2134967933 doi "https://doi.org/10.1002/jcp.21267" @default.
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