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• W1562078654 abstract "Previous studies have suggested that p53 is required for apoptosis induction by phenethyl isothiocyanate (PEITC), which is a highly promising cancer chemopreventive agent. Here, we report that p53 is not required for PEITC-induced apoptosis in the PC-3 human prostate cancer cell line and that the PEITC-induced apoptosis is mediated by extracellular signal-regulated kinases (ERK1/2). Exposure of PC-3 cells to an apoptosis-inducing concentration of PEITC (10 microM) resulted in a rapid and sustained activation of ERK1/2 that was evident as early as 1 h after PEITC treatment and persisted for the duration of the experiment (24-h after PEITC exposure). The PEITC-mediated activation of ERK1/2 was associated with an increase in phosphorylation of its substrate Elk-1 at Ser383. The PEITC-induced activation of ERK1/2 as well as apoptosis was abolished in the presence of mitogen-activated protein/ERK kinase 1 (a kinase upstream of ERK1/2) inhibitor PD98059. Exposure of PC-3 cells to 10 microM PEITC also resulted in a time-dependent activation of p38 protein kinase that was associated with increased phosphorylation of activating transcription factor 2 at Thr71. Even though the PEITC-induced activation of p38 protein kinase was abrogated in the presence of its specific inhibitor SB202190, inhibition of p38 protein kinase activation did not prevent PEITC-induced apoptosis. In contrast to previous reports in other cellular systems, c-Jun NH(2)-terminal kinases were not activated by PEITC treatment in PC-3 human prostate carcinoma cell line. In conclusion, the results of the present study indicate that p53 is not essential for PEITC-induced apoptosis and that the PEITC-induced apoptosis in PC-3 human prostate carcinoma cell line is mediated by ERKs. Thus, it seems reasonable to postulate that PEITC may be effective against tumors with normal as well as mutant p53." @default.
• W1562078654 created "2016-06-24" @default.
• W1562078654 creator A5022304953 @default.
• W1562078654 creator A5026243543 @default.
• W1562078654 date "2002-07-01" @default.
• W1562078654 modified "2023-10-02" @default.
• W1562078654 title "Phenethyl isothiocyanate-induced apoptosis in p53-deficient PC-3 human prostate cancer cell line is mediated by extracellular signal-regulated kinases." @default.
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