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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
Differential apoptotic response of human melanoma cells to 1 alpha,25-dihydroxyvitamin D3 and its analogues.
Cell Death and Differentiation 1998 November
Pleiotropic actions of the biologically active form of vitamin D3, 1 alpha,25-dihydroxyvitamin D3 (VD), include antiproliferative effects in both normal human melanocytes and malignant melanoma cell lines. In this study the actions of VD and its low calcemic analogues EB1089 and CB1093, have been examined in two human melanoma cell lines MeWo and WM1341. Both cell lines express similar amounts of vitamin D receptor mRNA and show functional gene regulatory effects in response to VD and its analogues. VD, EB1089 and CB1093 induced apoptosis only in WM1341 cells and not in MeWo cells, even though both cell lines responded well to etoposide, a strong inducer of apoptosis. Additionally, these results were confirmed by analysis of cell morphology. Interestingly in WM1341 cells, CB1093 was found to be more potent in inducing apoptosis than EB1089 and the natural hormone. Moreover, CB1093 appeared to induce apoptosis at a relatively low concentration of 0.1 nM, whereas greater than tenfold higher concentrations of VD and EB1089 were needed to obtain comparable effects. These observations highlight CB1093 as a promising drug for a future treatment against specific types of melanoma.
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