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Journal Article
Research Support, Non-U.S. Gov't
Steroid hormone calcitriol and its analog tacalcitol inhibit miR-125b expression in a human breast cancer MCF-7 cell line.
Steroids 2019 January
MiR-125b belongs to the class of microRNAs, which are short endogenous non-coding RNAs that negatively regulate gene expression at the post-transcriptional level. Recently, it was reported that miR-125b was found to promote migration and invasion of MCF-7 cells and was involved in chemotherapeutic resistance. Decreasing miR-125b expression would have potential therapeutic significance in preventing dissemination of breast cancer cells. The objective of this study was to evaluate miR-125b expression levels in MCF-7 cells following treatment with 1,25-dihydroxyvitamin D3 (calcitriol) and 1,24-dihydroxyvitamin D3 (tacalcitol), active metabolite and synthetic analog of vitamin D3 , respectively. We found that treatment with both calcitriol and tacalcitol caused a decrease in miR-125b expression. In addition, treatment with calcitriol and tacalcitol resulted in an increase in the level of pro-apoptotic BAK1 protein encoded by the target gene of miR-125b. We are discussing the putative mechanism of inhibition of the miR-125b expression by vitamin D receptor (VDR) agonists and we suggest that calcitriol and tacalcitol may be used as a miR-125b inhibitor in breast cancer cells expressing VDR.
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