期刊
ONCOLOGY
卷 74, 期 3-4, 页码 198-206出版社
KARGER
DOI: 10.1159/000151367
关键词
esophageal cancer; polo-like kinase 1; RNA silencing; cell cycle; apoptosis
类别
资金
- Natural Science Foundation Project of CQ CSTC [2007BB5302]
- CQMU Key [XBZD200707]
- National Natural Science Foundation of China [30671008]
Esophageal cancer ranks among one of the most frequent causes of cancer death in the world. Polo-like kinase 1 (Plk1) is overexpressed in human tumors and has prognostic value in many cancers including esophageal cancer, indicating its potential as a therapeutic target. In this study, we investigated the therapeutic potential of Plk1 in esophageal cancer using the technique of RNA silencing via small interfering RNA ( siRNA). Synthetic siRNA duplexes against Plk1 were introduced into 4 esophageal cancer cell lines, which subsequently resulted in a significant inhibition in Plk1 expression in the cells. We found that the targeted depletion of Plk1 caused a dramatic mitotic catastrophe ( mitotic cell cycle arrest as well as defects in several mitotic events such as incomplete separation of sister chromatids and failure of cytokinesis) followed by massive apoptotic cell death, and eventually resulted in a significant decrease in growth and viability of all 4 esophageal cancer cell lines studied. In addition, our results also indicated that the mitotic arrest induced by Plk1 depletion is mediated by the inactivation of the cdc2/cyclin B1 complex. Taken together, our study strongly suggests that Plk1 may serve as a potential therapeutic target in human esophageal cancer. Copyright (c) 2008 S. Karger AG, Basel.
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