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- W2076402810 abstract "25-Hydroxyvitamin D3-24-hydroxylase (24-hydroxylase, CYP24) is an important inactivating enzyme controlling the concentrations of both active metabolites 25-hydroxyvitamin D3 and 1alpha,25-dihydroxyvitamin D3. In this paper, we demonstrate that 25-hydroxyvitamin D3 at 500 nM significantly increases the expression of 24-hydroxylase mRNA and the increase is significantly decreased by 5alpha-dihydrotestosterone (DHT) at concentrations of 1-100 nM in androgen-sensitive prostate cancer cells LNCaP. 25-Hydroxyvitamin D3 at 500 nM and 1alpha,25-dihydroxyvitamin D3 at 10 nM inhibit LNCaP cell growth, and the growth inhibition is enhanced by 1 nM DHT. Neither 25-hydroxyvitamin D3 nor 1alpha,25-dihydroxyvitamin D3 at physiological concentrations has growth effect. However, in the presence of 1 nM DHT, both 25-hydroxyvitamin D3 and 1alpha,25-dihydroxyvitamin D3 at physiological concentrations are clearly antiproliferative. These data demonstrate that DHT enhances the antiproliferative activity of Vitamin D3 hormones by inhibiting their inactivating enzyme. Most previous studies on Vitamin D3 action in cell cultures have used pharmacological concentrations of 1alpha,25-dihydroxyvitamin D3, the present results demonstrate, for the first time, that both 25-hydroxyvitamin D3 and 1alpha,25-dihydroxyvitamin D3 at physiological concentrations are active in the presence of physiological concentration of androgen. The combined use of androgen and Vitamin D3 metabolites could be a promising treatment for prostate cancer." @default.
- W2076402810 created "2016-06-24" @default.
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- W2076402810 date "2006-04-01" @default.
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- W2076402810 title "Androgen enhances the antiproliferative activity of Vitamin D3 by suppressing 24-hydroxylase expression in LNCaP cells" @default.
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- W2076402810 doi "https://doi.org/10.1016/j.jsbmb.2005.11.006" @default.
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