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• W2108363571 abstract "Treatment with epigallocatechin-3-gallate (EGCG), a polyphenolic compound of green tea, results in activation of p53 and induction of apoptosis in prostate cancer LnCaP cells. However, no direct evidence has delineated the role of p53 and p53-dependent pathways in EGCG-mediated apoptosis. To understand the mechanism of negative growth regulation of prostate cancer cells by EGCG we undertook a genetic approach and generated an isogenic pair of prostate carcinoma cells PC3 (p53-/-) by stably introducing a cDNA encoding wild-type p53. Treatment of the resultant cells, PC3-p53, with EGCG led to, as reported earlier in LnCaP cells, an increase in p53 protein, which exacerbated both G1 arrest and apoptosis. This response was accompanied by an increase in the levels of p21 and Bax. The cells lacking p53 continued to cycle and did not undergo apoptosis upon treatment with similar concentrations of EGCG, thus establishing the action of EGCG in a p53-dependent manner. This observation was revalidated in another prostate cancer LNCaP cells harboring wild-type p53. Inactivation of p53 using small interfering RNA (siRNA) rendered these cells resistant to EGCG-mediated apoptosis. Because p53 activation led to increase in p21 and Bax, we investigated whether these two proteins are important in this process. Ablation of p21 protein by siRNA prevented G1 arrest and apoptosis in PC3-p53 cells. The p53-dependent increase in Bax expression altered the Bax/Bcl-2 ratio and paralleled the activation of caspase 9 and 3 and cleavage of PARP. Transfection of cells with Bax siRNA abolished these effects and inhibited apoptosis but did not affect the accumulation of the cells in G1. In summary, using isogenic cell lines and siRNA, we have clearly demonstrated that EGCG activates growth arrest and apoptosis primarily via p53-dependent pathway that involves the function of both p21 and Bax such that down-regulation of either molecule confers a growth advantage to the cells." @default.
• W2108363571 created "2016-06-24" @default.
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• W2108363571 date "2005-03-11" @default.
• W2108363571 modified "2023-10-15" @default.
• W2108363571 title "Ablation of either p21 or Bax prevents p53‐dependent apoptosis induced by green tea polyphenol epigallocatechin‐3‐gallate" @default.
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• W2108363571 doi "https://doi.org/10.1096/fj.04-2226fje" @default.
• W2108363571 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15764647" @default.
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