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1,25-Dihydroxyvitamin D3 has been known to have the tumor-suppressive activity in various kinds of tumors. However, the exact effect and working mechanism of 1,25-dihydroxyvitamin D3 on the tumor-suppressive activity in human kidney cancer cells remains poorly understood. 1,25-Dihydroxyvitamin D3 has cytotoxicity to ACHN cells and inhibited ACHN cell proliferation compared to the vehicle control. 1,25-Dihydroxyvitamin D3 increased the expression of the cleaved PARP1, active Caspase3, Bax, and Bim but decreased the expression of Bcl2 in ACHN cells. Moreover, 1,25-dihydroxyvitamin D3 down-regulated the phosphorylated Akt and Erk which might lead to apoptosis through activation of FOXO3 in ACHN cells. Transfection of siRNA against FOXO3 attenuated the pro-apoptotic BimEL expression in ACHN cells treated with 1,25-dihydroxyvitamin D3. These results suggest that FOXO3 is involved in the apoptosis induced by 1,25-dihydroxyvitamin D3.

Tumor-suppressive activity of 1,25-dihydroxyvitamin D3 against kidney cancer cells via up-regulation of FOXO3