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  • Title: The expression of PLK-1 in cervical carcinoma: a possible target for enhancing chemosensitivity.
    Author: Zhang Y, Liu Y, Yang YX, Xia JH, Zhang HX, Li HB, Yu CZ.
    Journal: J Exp Clin Cancer Res; 2009 Sep 23; 28(1):130. PubMed ID: 19775446.
    Abstract:
    BACKGROUND: Polo-like kinase-1 (PLK-1) is reported to be upregulated in a variety of human tumors and is implicated in cell proliferation and survival. However, its importance in cervical carcinoma has not yet been fully elucidated. METHODS: We examined PLK-1 expression in cervical carcinoma tissues using immunohistochemical staining. Furthermore, we blocked PLK-1 expression in HeLa cells using specific siRNA and detected the cell cycle, cell proliferation and chemosensitivity using western blotting, MTT and flow cytometry. RESULTS: We provide evidence that expression of PLK-1 exists in human cervical carcinoma tissues and establish an association with tumor size. Furthermore, we show that PLK-1 knockdown by transfection of siRNA induces accumulation of HeLa cells in the G2/M cell cycle phase and enhances cisplatin-induced apoptosis. CONCLUSION: Our results indicate that PLK-1 production in HeLa cells might be critical in determining whether cells survive or undergo apoptosis. Therefore, targeting PLK-1 might be a promising strategy for enhancing sensitivity to chemotherapeutic reagents in cervical carcinoma.
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