Title : Autocrine control of vitamin D metabolism in synovial cells from arthritic patients.

Pub. Date : 1999 Jun

PMID : 10340962






6 Functional Relationships(s)
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1 OBJECTIVE: This study was designed to investigate whether 1, 25-dihydroxyvitamin D3 (1,25-(OH)2D3), produced by activated synovial fluid macrophages, promotes its own catabolism by upregulating vitamin D-24-hydroxylase (24-OHase) in synovial fibroblasts through a vitamin D receptor (VDR) mediated mechanism. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens
2 OBJECTIVE: This study was designed to investigate whether 1, 25-dihydroxyvitamin D3 (1,25-(OH)2D3), produced by activated synovial fluid macrophages, promotes its own catabolism by upregulating vitamin D-24-hydroxylase (24-OHase) in synovial fibroblasts through a vitamin D receptor (VDR) mediated mechanism. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens
3 OBJECTIVE: This study was designed to investigate whether 1, 25-dihydroxyvitamin D3 (1,25-(OH)2D3), produced by activated synovial fluid macrophages, promotes its own catabolism by upregulating vitamin D-24-hydroxylase (24-OHase) in synovial fibroblasts through a vitamin D receptor (VDR) mediated mechanism. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens
4 OBJECTIVE: This study was designed to investigate whether 1, 25-dihydroxyvitamin D3 (1,25-(OH)2D3), produced by activated synovial fluid macrophages, promotes its own catabolism by upregulating vitamin D-24-hydroxylase (24-OHase) in synovial fibroblasts through a vitamin D receptor (VDR) mediated mechanism. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens
5 1,25-(OH)2D3 increased fibroblast 24-OHase activity, yielding 24-hydroxylated, and more polar, metabolites. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens
6 CONCLUSIONS: 1, 25-(OH)2D3 is produced by macrophages in vitro at biologically relevant concentrations and can increase its own catabolism by synovial fibroblasts; this effect is probably mediated via upregulation of both synovial fibroblast VDR and 24-OHase. Calcitriol cytochrome P450 family 24 subfamily A member 1 Homo sapiens