25-Hydroxyvitamin D(3) is an agonistic vitamin D receptor ligand

The Journal of Steroid Biochemistry and Molecular Biology
Yan-Ru LouPentti Tuohimaa

Abstract

25-Hydroxyvitamin D(3) 1alpha-hydroxylase encoded by CYP27B1 converts 25-hydroxyvitamin D(3) into 1alpha,25-dihydroxyvitamin D(3), a vitamin D receptor ligand. 25-Hydroxyvitamin D(3) has been regarded as a prohormone. Using Cyp27b1 knockout cells and a 1alpha-hydroxylase-specific inhibitor we provide in four cellular systems, primary mouse kidney, skin, prostate cells and human MCF-7 breast cancer cells, evidence that 25-hydroxyvitamin D(3) has direct gene regulatory properties. The high expression of megalin, involved in 25-hydroxyvitamin D(3) internalisation, in Cyp27b1(-/-) cells explains their higher sensitivity to 25-hydroxyvitamin D(3). 25-Hydroxyvitamin D(3) action depends on the vitamin D receptor signalling supported by the unresponsiveness of the vitamin D receptor knockout cells. Molecular dynamics simulations show the identical binding mode for both 25-hydroxyvitamin D(3) and 1alpha,25-dihydroxyvitamin D(3) with the larger volume of the ligand-binding pocket for 25-hydroxyvitamin D(3). Furthermore, we demonstrate direct anti-proliferative effects of 25-hydroxyvitamin D(3) in human LNCaP prostate cancer cells. The synergistic effect of 25-hydroxyvitamin D(3) with 1alpha,25-dihydroxyvitamin D(3) in Cyp27b1(-/-) cells ...Continue Reading

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