MicroRNA-218在肝细胞癌中的表达及功能 |
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引用本文: | 李超,涂康生,郑鑫,张竞,拓航,高洁,姚英民,刘青光.MicroRNA-218在肝细胞癌中的表达及功能[J].南方医科大学学报,2013,33(8):1127. |
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作者姓名: | 李超 涂康生 郑鑫 张竞 拓航 高洁 姚英民 刘青光 |
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摘 要: | 目的检测MicroRNA-218(miR-218)在肝细胞癌中的表达情况并研究其在肝癌中的功能。方法收集46例肝细胞癌及对 应癌旁组织,运用qRT-PCR技术检测miR-218 在肝癌及对应癌旁组织中的表达情况;应用miR-218 mimic转染人肝癌细胞系 HepG2,MTT和流式细胞术检测转染后细胞活力和凋亡变化,qRT-PCR和Western blot检测miR-218潜在靶点的表达变化。结 果miR-218在肝癌组织中的表达显著低于对应的癌旁组织(P<0.05);miR-218低表达与肿瘤大小(>5 cm)和高TNM分期(Ⅲ+ Ⅳ)具有显著相关性(P<0.05);在HepG2细胞中,miR-218抑制细胞增殖和诱导凋亡,并下调Bmi-1和CDK6 mRNA及蛋白表达 (P<0.05)。结论miR-218低表达与肝癌的恶性临床病理特征相关,miR-218可能通过下调Bmi-1和CDK6表达抑制肝癌细胞增 殖和促进凋亡。
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MicroRNA-218 expression and its role in hepatocellular carcinoma |
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Abstract: | Objective To investigate the expression of microRNA-218 (miR-218) and its role in hepatocellular carcinoma (HCC). Methods Forty-six pairs of fresh surgical specimens of HCC and adjacent tissues were examined for miR-218 expression using qRT-PCR. A miR-218 mimic was transfected into HepG2 cells, and the cell viability and apoptosis were analyzed by MTT assay and flow cytometry, and the potential targets of miR-218 were detected by qRT-PCR and Western blotting. Results The expressions of miR-218 in HCC tissues were significantly down-regulated compared to those in the adjacent tissues (P<0.05). Down-regulation of miR-218 was found to correlate significantly with the tumor size (>5 cm) and an advanced TNM stage (III+ IV) (P<0.05). Ectopic expression of miR-218 in HepG2 cells resulted in suppressed cell proliferation and enhanced cell apoptosis as well as the down-regulation of Bmi-1 and CDK6 mRNA and protein expressions (P<0.05). Conclusion The low-expression of miR-218 is correlated with malignant clinicopathological characteristics of HCC, and miR-218 may inhibit cell proliferation and promote cell apoptosis by down-regulating Bmi-1 and CDK6 in HCC.
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