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Physical and functional interaction between the vitamin D receptor and hairless corepressor, two proteins required for hair cycling.

Authors: Hsieh, JC  Sisk, JM  Jurutka, PW  Haussler, CA  Slater, SA  Haussler, MR  Thompson, CC 
Citation: Hsieh JC, etal., J Biol Chem. 2003 Oct 3;278(40):38665-74. Epub 2003 Jul 7.
Pubmed: (View Article at PubMed) PMID:12847098
DOI: Full-text: DOI:10.1074/jbc.M304886200

Both the vitamin D receptor (VDR) and hairless (hr) genes play a role in the mammalian hair cycle, as inactivating mutations in either result in total alopecia. VDR is a nuclear receptor that functions as a ligand-activated transcription factor, whereas the hairless gene product (Hr) acts as a corepressor of both the thyroid hormone receptor (TR) and the orphan nuclear receptor, RORalpha. In the present study, we show that VDR-mediated transactivation is strikingly inhibited by coexpression of rat Hr. The repressive effect of Hr is observed on both synthetic and naturally occurring VDR-responsive promoters and also when VDR-mediated transactivation is augmented by overexpression of its heterodimeric partner, retinoid X receptor. Utilizing in vitro pull down methods, we find that Hr binds directly to VDR but insignificantly to nuclear receptors that are not functionally repressed by Hr. Coimmunoprecipitation data demonstrate that Hr and VDR associate in a cellular milieu, suggesting in vivo interaction. The Hr contact site in human VDR is localized to the central portion of the ligand binding domain, a known corepressor docking region in other nuclear receptors separate from the activation function-2 domain. Coimmunoprecipitation and functional studies of Hr deletants reveal that VDR contacts a C-terminal region of Hr that includes motifs required for TR and RORalpha binding. Finally, in situ hybridization analysis of hr and VDR mRNAs in mouse skin demonstrates colocalization in cells of the hair follicle, consistent with a hypothesized intracellular interaction between these proteins to repress VDR target gene expression, in vivo.

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CRRD Object Information
CRRD ID: 1599578
Created: 2007-02-07
Species: All species
Last Modified: 2007-02-07
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.