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TRPM2 mediates distruption of autophagy machinery and correlates with the grade level in prostate cancer.

J. Cancer Res. Clin. Oncol.2019 May;145(5):1297-1311. Epub 2019 Mar 19
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摘要


PURPOSE:Transient receptor potential melastatin 2 (TRPM2), a calcium-permeable ion channel, is shown as a prognostic marker candidate in prostate cancer (PCa) and an important regulator of autophagy. We aimed to determine the changes in TRPM2 and autophagic-apoptotic gene expression levels in human prostate adenocarcinomas, and to investigate the affect of TRPM2 on autophagic pathways in PC-3 cell line. METHODS:Human prostate tissues were classified considering the grade levels and were divided into the control, BPH, and grade 1-5 groups. mRNA expression levels of genes were determined by qPCR. In addition, TRPM2 was evaluated immunohistochemically for each group. In PC-3 cell line, TRPM2 was silenced through siRNA transfection, and autophagy induction was analyzed by acridine orange (AO) staining. RESULTS:The qPCR and immunoreactivity results showed that the increased TRPM2 expression levels in human PCa samples were paralleled with higher grade levels. The autophagic-apoptotic gene expressions showed high variability in different grade levels. Also, silencing TRPM2 in PC-3 cells altered autophagic gene expressions and caused autophagy induction according to the AO staining results. CONCLUSION:We showed that the autophagy-TRPM2 association may take place in the molecular basis of PCa and accordingly this connection may be targeted as a new therapeutic approach in PCa.

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