Title : Regulation of 1,25-dihydroxyvitamin D3 receptors by parathyroid hormone in osteoblastic cells: role of second messenger pathways.

Pub. Date : 1995 Feb

PMID : 7835303






7 Functional Relationships(s)
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1 Treatment of these cells with forskolin (FSK) caused up-regulation of VDR, whereas treatment with phorbol esters suppressed VDR levels. Colforsin vitamin D receptor Rattus norvegicus
2 Treatment of these cells with forskolin (FSK) caused up-regulation of VDR, whereas treatment with phorbol esters suppressed VDR levels. Colforsin vitamin D receptor Rattus norvegicus
3 Treatment of these cells with forskolin (FSK) caused up-regulation of VDR, whereas treatment with phorbol esters suppressed VDR levels. Phorbol Esters vitamin D receptor Rattus norvegicus
4 PTH or PTH-related protein treatment induced a 2- to 3-fold increase in VDR, which was equivalent to that elicited by FSK in UMR 106-01 cells but less than the FSK-induced increase (approximately 8-fold) in MC3T3-E1 cells. Colforsin vitamin D receptor Rattus norvegicus
5 In UMR 4-7 cells, a subclone of UMR 106-01 cells that express cAMP resistance due to regulated expression of a mutant form of the type 1 regulatory subunit of the cAMP-dependent protein kinase A (PKA), the up-regulation of VDR abundance due to FSK and PTH treatment was mostly prevented. Cyclic AMP vitamin D receptor Rattus norvegicus
6 In UMR 4-7 cells, a subclone of UMR 106-01 cells that express cAMP resistance due to regulated expression of a mutant form of the type 1 regulatory subunit of the cAMP-dependent protein kinase A (PKA), the up-regulation of VDR abundance due to FSK and PTH treatment was mostly prevented. Colforsin vitamin D receptor Rattus norvegicus
7 Thus, exposure of target cells to PTH augments their response to 1,25-dihydroxyvitamin D3 due to up-regulation of VDR abundance. Calcitriol vitamin D receptor Rattus norvegicus