Abstract
Proliferation of the non-malignant breast epithelial cell line, MCF-12A, is sensitively and completely inhibited by 1alpha,25-dihydroxyvitamin D(3) (1alpha,25(OH)(2)D(3)) (ED90 = 70 nM), We used real time RT-PCR to demonstrate that the relative resistance to 1alpha,25(OH)(2)D(3) of MDA-MB-231 cells (ED50 > 100 nM) correlated with significantly reduced Vitamin D receptor (VDR) and increased NCoR1 nuclear receptor co-repressor mRNA (0.1-fold reduction in VDR and 1.7-fold increase in NCoR1 relative to MCF-12A (P < 0.05)). This molecular lesion can be targeted by co-treating cells with 1alpha,25(OH)(2)D(3) or potent analogs and the histone deacetylation inhibitor trichostatin A (TSA). For example, the co-treatment of 1,25-dihydroxy-16,23,Z-diene-26,27-hexafluoro-19-nor Vitamin D(3) (RO-26-2198) (100 nM) plus TSA results in strong additive antiproliferative effects in MDA-MB-231 cells. This may represent novel chemotherapeutic regime for hormone insensitive breast cancer.
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