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- W1970258257 abstract "The active metabolite of vitamin D, 1α,25-dihydroxyvitamin D(3) (1,25D) reduces the growth of several prostate cancer cell lines, most commonly by inducing a cell-cycle arrest in G(1). This is mediated, in part, through down-regulation of c-Myc, a positive regulator of the transcription factor, E2F. There is evidence that prostate cancer cells lacking functional retinoblastoma protein (Rb), a negative regulator of E2F activity, are poorly responsive to 1,25D treatment. Since up to 60% of prostate cancers demonstrate a loss of heterozygosity for Rb, we sought to determine whether Rb is required for the growth inhibitory effects of 1,25D.Using siRNA, Rb was reduced in C4-2 prostate cancer cells, and the response of cells to 1,25D treatment or depletion of c-myc measured by [(3)H]-thymidine incorporation and flow cytometry. The effects of 1,25D treatment on E2F levels and activity, and E2F target gene expression were also measured.1,25D treatment and c-Myc depletion both cause a G(1) arrest inhibiting C4-2 cell proliferation independently of Rb. 1,25D reduces c-Myc expression and causes a decrease in E2F and E2F target genes. Bcl-2, an E2F target and positive regulator of C4-2 cell growth, also is down-regulated by 1,25D independently of Rb.Redundant growth inhibitory pathways compensate for the loss of Rb, and tumors lacking functional Rb may be responsive to 1,25D." @default.
- W1970258257 created "2016-06-24" @default.
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- W1970258257 date "2010-11-23" @default.
- W1970258257 modified "2023-10-15" @default.
- W1970258257 title "1α,25-dihydroxyvitamin D<sub>3</sub>inhibits C4-2 prostate cancer cell growth via a retinoblastoma protein (Rb)-independent G<sub>1</sub>arrest" @default.
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- W1970258257 doi "https://doi.org/10.1002/pros.21226" @default.
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