title: Identification of a vitamin D-response element in the rat calcidiol (25-hydroxyvitamin D3) 24-hydroxylase gene.
abstract: The calcidiol (25-hydroxyvitamin D3) 24-hydroxylase is one of the key enzymes in the metabolism of vitamin D. This enzyme acts on both calcidiol and calcitriol (1,25-dihydroxyvitamin D3) to initiate degradation of these potent vitamin D metabolites and is tightly regulated. Calcitriol itself induces this enzyme and acts at the transcriptional level. Transcriptional regulation of genes by calcitriol has been shown to occur via the vitamin D-receptor binding to a vitamin D-response element located upstream of the transcription start site. We now report a vitamin D-response element located between nt -262 and nt -238 of the rat calcidiol 24-hydroxylase gene. This sequence binds the calcitriol receptor and confers vitamin D-dependent transactivation of transcription to its own, as well as heterologous, promoter.
authors.affiliation: Department of Biochemistry, College of Agricultural and Life Sciences, University of Wisconsin-Madison 53706.
authors.forename: C
authors.initials: C
authors.lastname: Zierold
authors.forename: H M
authors.initials: HM
authors.lastname: Darwish
authors.forename: H F
authors.initials: HF
authors.lastname: DeLuca
mesh_terms: D000818:Animals; D001483:Base Sequence; D002117:Calcitriol / Q000494:pharmacology; D015500:Chloramphenicol O-Acetyltransferase / Q000235:genetics; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D004247:DNA / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects; D017930:Genes, Reporter; D008969:Molecular Sequence Data; D011401:Promoter Regions, Genetic; D051381:Rats; D013250:Steroid Hydroxylases / Q000235:genetics*; D014158:Transcription, Genetic / Q000187:drug effects; D014807:Vitamin D / Q000494:pharmacology*; D065668:Vitamin D3 24-Hydroxylase
chemical_list: D014807:Vitamin D; D004247:DNA; D003577:Cytochrome P-450 Enzyme System; D013250:Steroid Hydroxylases; D065668:Vitamin D3 24-Hydroxylase; D015500:Chloramphenicol O-Acetyltransferase; D002117:Calcitriol