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Expression of VDR and CYP24A1 mRNA in human tumors

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Abstract

1,25-dihydroxyvitamin D3 (1,25(OH)2D3) and its analogues have been shown to inhibit proliferation of human cancer cells mediated by vitamin D receptor (VDR). The over-expression of 25-hydroxyvitamin D-24-hydroxylase (CYP24A1), an enzyme involved in the metabolism of 1,25(OH)2D3 and its analogues, is associated with poor prognosis of some human cancers. In this study, we employed real-time reverse transcription PCR to examine the expression of VDR and CYP24A1 mRNA in a cohort of human breast, lung, colon and ovary tumor samples. We found that CYP24A1 mRNA was significantly up-regulated in colon, ovary and lung tumors, but down-regulated in breast tumor relative to the analogous normal tissues. As a comparison, VDR mRNA was modestly down-regulated in colon, breast and lung tumors, but highly up-regulated in ovarian tumors. Treatment of two breast cancer cell lines, SW-620 and MCF-7, and one colon cancer cell line, HT-29, by 1,25(OH)2D3 for 48 h profoundly stimulated CYP24A1 mRNA expression (EC50=0.6, 0.8 and 29.5 nM in SW-620, HT-29 and MCF-7, respectively), but did not significantly affect VDR mRNA expression. Growth as assessed by DNA synthesis was modestly arrested by 1,25(OH)2D3 after 72 h of incubation, but was not altered after a 5-day incubation period. These data suggest that the VDR signaling pathway may be compromised via the modulation of CYP24A1 and VDR in human tumors.

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Correspondence to J. Ruth Wu-Wong.

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Anderson, M.G., Nakane, M., Ruan, X. et al. Expression of VDR and CYP24A1 mRNA in human tumors. Cancer Chemother Pharmacol 57, 234–240 (2006). https://doi.org/10.1007/s00280-005-0059-7

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