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. 1994 Jun 25;22(12):2410–2416. doi: 10.1093/nar/22.12.2410

Identification of a vitamin D responsive element in the promoter of the rat cytochrome P450(24) gene.

C N Hahn 1, D M Kerry 1, J L Omdahl 1, B K May 1
PMCID: PMC523703  PMID: 8036172

Abstract

Mitochondrial cytochrome P450(24) expression in the vitamin D-degradation pathway is induced by 1,25-dihydroxyvitamin D3 [1,25-(OH)2D3]. The molecular basis of this enzyme regulation was investigated by isolating the rat P450(24) gene and examining the 5'-flanking region for possible cis-acting regulatory elements involved in the induction process. Constructs containing different lengths of 5'-flanking region of the gene were linked to a luciferase reporter gene and transiently co-transfected with a human vitamin D receptor (hVDR) expression vector (pRSV-hVDR) into COS-1 cells. These experiments showed that the flanking region from -298 to -122 directed a 24-fold increase in luciferase activity in response to 1,25-(OH)2D3 provided that the cells were co-transfected with pRSV-hVDR. Within this region, the sequence from position -171 to -123 conferred 1,25-(OH)2D3 responsiveness to both the native P450(24) promoter and the heterologous thymidine kinase promoter. Mutagenesis revealed that the sequence from position -150 to -136 is required for induction by 1,25-(OH)2D3 and that this sequence shares similarity to other vitamin D responsive elements (VDREs) reported for other genes. Gel shift mobility assays showed this region specifically bound a nuclear protein complex from 1,25-(OH)2D3 treated COS-1 cells that had been co-transfected with pRSV-hVDR. The retarded band was specifically competed with the well characterized VDRE from the mouse osteopontin gene. A VDRE at position -150 to -136 in the promoter of the rat P450(24) gene is identified in this study and found to be important in mediating the enhanced expression of the gene by 1,25-(OH)2D3.

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Selected References

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