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    Cancer Lett. 2007 Mar 8;247(1):122-9. Epub 2006 Apr 27.

    Docetaxel-induced growth inhibition and apoptosis in androgen independent prostate cancer cells are enhanced by 1alpha,25-dihydroxyvitamin D3.

    Source

    Department of Urology, University of Rochester Medical Center, Rochester, NY 14642, USA.

    Abstract

    Pre-treatment with high-dose 1alpha,25-dihydroxyvitamin D(3) (1,25-VD) enhanced the antitumor activity of docetaxel in the androgen-independent prostate cancer cell line, PC-3. The effect manifested as an increasing population of apoptotic cells and amount of pro-apoptotic protein, Bax, under combined treatment compared with single treatment of either 1,25-VD or docetaxel alone. We further demonstrated that pre-treatment with 1,25-VD reduced the expression of multidrug resistance-associated protein-1 at both the mRNA and protein levels. This suggests pre-treatment with 1,25-VD can potentiate cytotoxicity of docetaxel in PC-3 due to 1,25-VD reducing multidrug resistance-associated protein-1 expression.

    PMID:
    16644109
    [PubMed - indexed for MEDLINE]

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