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- W1969403443 abstract "Nephrin plays a key role in maintaining the structure of the slit diaphragm in the glomerular filtration barrier. Our previous studies have demonstrated potent renoprotective activity for 1,25-dihydroxyvitamin D (1,25(OH)(2)D(3)). Here we showed that in podocytes 1,25(OH)(2)D(3) markedly stimulated nephrin mRNA and protein expression. ChIP scan of the 6-kb 5' upstream region of the mouse nephrin gene identified several putative vitamin D response elements (VDREs), and EMSA confirmed that the VDRE at -312 (a DR4-type VDRE) could be bound by vitamin D receptor (VDR)/retinoid X receptor. Luciferase reporter assays of the proximal nephrin promoter fragment (-427 to +173) showed strong induction of luciferase activity upon 1,25(OH)(2)D(3) treatment, and the induction was abolished by mutations within -312VDRE. ChIP assays showed that, upon 1,25(OH)(2)D(3) activation, VDR bound to this VDRE leading to recruitment of DRIP205 and RNA polymerase II and histone 4 acetylation. Treatment of mice with a vitamin D analog induced nephrin mRNA and protein in the kidney, accompanied by increased VDR binding to the -312VDRE and histone 4 acetylation. 1,25(OH)(2)D(3) reversed high glucose-induced nephrin reduction in podocytes, and vitamin D analogs prevented nephrin decline in both type 1 and 2 diabetic mice. Together these data demonstrate that 1,25(OH)(2)D(3) stimulates nephrin expression in podocytes by acting on a VDRE in the proximal nephrin promoter. Nephrin up-regulation likely accounts for part of the renoprotective activity of vitamin D." @default.
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- W1969403443 date "2011-09-01" @default.
- W1969403443 modified "2023-10-14" @default.
- W1969403443 title "Molecular Mechanism Underlying 1,25-Dihydroxyvitamin D Regulation of Nephrin Gene Expression" @default.
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- W1969403443 doi "https://doi.org/10.1074/jbc.m111.269118" @default.
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