Inhibition of expression of anti-apoptotic protein Bcl-2 and induction of cell death in radioresistant human prostate adenocarcinoma cell line (PC-3) by methyl jasmonate

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• 作者：Daniel Ezekwudo ; Rangaiah Shashidharamurthy ; Dilip Devineni ; Erica Bozeman ; Ravi Palaniappan ; Periasamy Selvaraj
• 关键词：Methyl jasmonate ; PC-3 ; Bcl-2 ; Radiation ; Apoptosis ; Caspase-3 ; Combined treatment
• 刊名：Cancer Letters
• 出版年：2008
• 出版时间：8 November 2008
• 年：2008
• 卷：270
• 期：2
• 页码：277-285
• 全文大小：431 K

文摘

Hormone refractory human prostate cancer cell lines are known to be radioresistant, a feature attributed to their ability to induce anti-apoptotic proteins of the Bcl-2 family when exposed to radiation. We investigated whether pro-apoptotic compounds such as methyl jasmonate, a plant stress hormone, can counteract the radiation-induced anti-apoptotic mechanism in a human prostate cancer cell line PC-3. Significant (p < 0.05) increase in cytotoxicity was observed in the combined treatment groups compared to single treatments with methyl jasmonate or γ-radiation. Treatment of irradiated PC-3 cells with methyl jasmonate resulted in suppression of anti-apoptotic Bcl-2 protein and elevation of caspase-3 activity. Our results showed increased apoptosis in the combined treatment group as compared to the irradiated group or the untreated control. In summary, methyl jasmonate suppressed the radiation-induced Bcl-2 expression and enhanced the radiation sensitivity of human prostate cancer cells.