Abstract
25-Hydroxyvitamin D-1α-hydroxylase (1α-OHase) is expressed in prostate cells.The expression suggests that local production of 1,25-dihydroxyvitamin D could provide an important cell growth regulatory mechanism. However,there is differential expression of 1α-OHase activity among the primary cultures of prostate cells derived from cancerous, benign prostatic hypertrophy and normal tissue, and among noncancerous (PZHPV-7) and various cancer cell lines (PC-3, DU145). No activity was found in cancer cell line LNCaP. The observed marked decrease in 1α-OHase activity in prostate cancer cells suggests some defect of the 1α-OHase in these cells. Using luciferase reporter gene assay,we observed a step-wise decrease in the basal promoter activity in two truncated promoter fragments, AN2 (_1,100 bp) and AN5 (-(-394 bp), with the highest basal activities found in PZHPV-7 and with loss of promoter activity in LNCaP. In order to understand the mechanism underlying the differential promoter activities among different prostate cells, we i0nvestigated the possible role of phosphorylation of cyclic AMP response element binding protein(CREB) on the regulation of 1α-OHase promoter activity in the four prostate cell lines. First we compared the levels of CREB phosphorylation among PZHPV-7, DU145, PC-3 and LNCaP cells by Western blot analysis using antibody against phosphorylated CREB. We observed that CREB was phosphorylated to a greater extent in PZHPV-7 than in DU145 cells.
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Wang, L., Whitlatch, L.W., Flanagan, J.N., Holick, M.F., Chen, T.C. (2003). Vitamin D Autocrine System and Prostate Cancer. In: Reichrath, J., Tilgen, W., Friedrich, M. (eds) Vitamin D Analogs in Cancer Prevention and Therapy. Recent Results in Cancer Research, vol 164. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-55580-0_16
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DOI: https://doi.org/10.1007/978-3-642-55580-0_16
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