The effects of 1,25-dihydroxyvitamin D3 on proliferation and apoptosis resistance of LNCaP cells are mediated via TRPV6 channel.

<p><b>A</b>, LNCaP cells proliferation in 2% FCS-containing RPMI medium treated with 1,25-dihydroxyvitamin D3 (100 nM, applied at D1), siRNA-TRPV6 (siTRPV6, 80 nM, transfected at D0), the combined treatment of 1,25-dihydroxyvitamin D3 and siTRPV6 specified above, and siRNA-AR (siAR, 80 nM, transfected at D0) as a positive control. * - P<0.05, ** - P<0.01, as compared to control, n = 4; <b>B</b>, a cell cycle assay of LNCaP cells (incubated with 2% FCS-containing RPMI medium) for the same conditions as in MTS assay (<b>A</b>) (D3 equals 100 nM 1,25-dihydroxyvitamin D3), carried out by flow cytometry of the cells stained with propidium iodide. * - P<0.05, ** - P<0.01, § - P<0.05 vs. Vitamin D3; n = 3. <b>C</b>, a western-blotting of proliferating cell nuclear antigen (PCNA) in the conditions indicated above as compared to β-actin. <b>D</b>, an apoptosis assay carried out by flow cytometry as a subG1 population of LNCaP cells cultured in 2% FCS-containing RPMI medium stained with propidium iodide. * - P<0.01 vs. control; n = 3.