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- W2083884524 abstract "The present study was designed to explore the possible presence and location of Vitamin D response elements (VDREs) in the human insulin receptor (hIR) gene promoter. To this end, the -1819 to -271 bp fragment of the hIR promoter (wild type promoter) and progressive 5' deletions of this promoter (up to -1473 and -876 bp) were linked to the luciferase pGL2-basic vector to construct the reported plasmids: phIR (-1819)-GL2, phIR(-1473)-GL2 and phIR(-876)-GL2, respectively. U-937 cells were transiently transfected with these plasmids, and then the cells were either untreated or treated for 24h with 10(-8) M 1,25-dihydroxyvitamin D(3) (1,25D(3)). Luciferase determinations revealed that, while the activity of the wild promoter was increased 1.6-fold by the hormone, the activities of progressive 5' deletions of this promoter were enhanced 1.7-, and 1.6-fold, respectively. Thus, the region extending from -876 to -271bp of the hIR promoter, appears to contain VDREs, and to be sufficient for induction by 1,25D(3). In order to identify these potential VDREs, we performed a computer search of candidate sequences by homology with a consensus VDRE sequence. This search yielded a sequence located between -761 and -732 bp (5'CGTCGGGCCTGTGGGGCGCCTCCGGGGGTC3'), which includes an overlapping AP-2 like sequence, as a good candidate. Electrophoretic mobility shift assays revealed that the Vitamin D receptor (VDR) specifically recognized this sequence, since a VDR-DNA complex was able to compete with the unlabeled probe and was cleared by the specific anti-VDR antibody 9A7. These data represent the first identification of a VDRE in the hIR gene promoter." @default.
- W2083884524 created "2016-06-24" @default.
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- W2083884524 date "2003-02-01" @default.
- W2083884524 modified "2023-10-06" @default.
- W2083884524 title "Identification of a Vitamin D response element in the human insulin receptor gene promoter" @default.
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- W2083884524 doi "https://doi.org/10.1016/s0960-0760(03)00032-3" @default.
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