miR-193b在肝细胞肝癌中的作用研究

The function of miR-193b in hepatocellular carcinoma

目的探讨miR-193b对肝细胞肝癌生物学行为的影响。方法收集48例肝细胞肝癌及对应癌旁组织标本，应用实时定量反转录聚合酶链反应（RT—PCR）的方法检测标本中miR-193b的表达。培养肝癌细胞HepG2及SMMC-7721，检测两种细胞中miR-193b的表达。用脂质体2000将miR．193b模拟物及相应的阴性对照组片段转染HepG2及SMMC-7721细胞，以未转染组作空白对照；用MTT法测定各组肝癌细胞的增殖能力；用流式细胞术检测各组肝癌细胞的凋亡情况。结果miR-193b在肝癌组织中的表达水平（2．441±0．569）明显低于癌旁组织（15．488±4．326）（P〈0．05）。与正常肝细胞L一02相比较，miR-193b在肝癌细胞HepG2及SMMC．7721中的表达水平也明显降低。转染miR-193b模拟物后，HepG2及SMMC-7721细胞增殖能力明显降低，细胞凋亡增加。结论miR-193b可能负向调控肝细胞肝癌的增殖，并增加其凋亡。

Objective To investigate the significance of miR-193b to biological behaviors of hepatocellular carcinoma （HCC）. Methods 48 cases of HCC specimens and corresponding adjacent tissues were collected, and the miR-193b expression levels in these specimens were measured by real-time quantitative PCR. The miR-193b expression was measured by the same way in HepG2 and SMMC-7721 cells. The HepG2 and SMMC-7721 were transfected with miR-193b mimics or negative control miRNA mimic with Lipofectamine 2000, and the non-transfected cells were taken as blank control. The proliferation ability of the HCC cells were detected by MTF method, and the apoptosis rate was tested by flow cytometry. Results The expression level of miR-193b in HCC tissues （2.441 ＋0.569） was significantly lower than that in the corresponding adjacent tissues （15.488＋4.326） （P 〈 0.05）. Compared with normal liver cell line L-O2, the expression levels of miR-193b were significantly lower in HepG2 and SMMC-7721 cells. Transfected with miR-193b mimic, the proliferation ability of HepG2 and SMMC-7721 ceils were reduced, while their apoptosis were increased. Conclusion miR-193b may be negative to regulate the proliferation of HCC and increase its apoptosis.