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- W2131285703 abstract "Previously, we have shown that c-Fos/activator protein-1 (AP-1) promotes tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL)-induced apoptosis by repressing the antiapoptotic molecule c-FLIP(L). In this study, we investigated whether synthetic induction of c-Fos/AP-1 by 12-O-tetradecanoylphorbol-13-acetate (TPA) converts the phenotype of TRAIL-resistant prostate cancer cells to a TRAIL-sensitive phenotype in vitro and in vivo.Low-dose TPA was used to determine whether LNCaP prostate cancer cells could be converted to a TRAIL-sensitive phenotype in in vitro and in vivo studies. We also assessed whether TPA enhancement of TRAIL-induced apoptosis varies between androgen-sensitive and androgen-insensitive prostate cancer cells and evaluated the role of TRAIL receptors, DR4 and DR5, in TPA-enhanced TRAIL-induced apoptosis.We show that the combination of TRAIL with low-dose TPA has no effect on nonmalignant prostate epithelial cells; however, TPA up-regulates most AP-1 proteins and AP-1 activity, reduces c-FLIP(L), and potentiates TRAIL-induced apoptosis. We show that the combination of TPA + TRAIL is effective in promoting apoptosis in both hormone-sensitive LNCaP and hormone-insensitive LNCaP-C4-2 prostate cancer cells. Although TPA enhances the TRAIL-receptor 1 (DR4) level, sensitization of prostate cancer cells seems to be more dependent on TRAIL-receptor 2 (DR5) than TRAIL-receptor 1 levels. In vivo xenograft experiments suggest that TPA elevates the expression of c-Fos and reduces c-FLIP(L). Combination of TPA with TRAIL-receptor 2 agonist antibody, lexatumumab, effectively increases apoptosis and reduces LNCaP xenograft tumor burden.TPA, when combined with the proapoptotic agent TRAIL, is effective in changing the phenotype of some TRAIL-resistant prostate cancer cells to a TRAIL-sensitive phenotype." @default.
- W2131285703 created "2016-06-24" @default.
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- W2131285703 date "2007-12-01" @default.
- W2131285703 modified "2023-09-23" @default.
- W2131285703 title "Low-Dose 12-O-Tetradecanoylphorbol-13-Acetate Enhances Tumor Necrosis Factor–Related Apoptosis-Inducing Ligand–Induced Apoptosis in Prostate Cancer Cells" @default.
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- W2131285703 doi "https://doi.org/10.1158/1078-0432.ccr-07-1133" @default.
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