Objective: To investigate the effects of lncRNA LINC00839 on the proliferation, migration and invasion of hepatocellular carcinoma cells and its mechanism. Methods: Real-time quantitative polymerase chain reaction (RT-qPCR) was used to detect the expression of LINC00839 and miR-3666 in hepatocellular carcinoma tissues and adjacent tissues. Pearson correlation was used to analyze the correlation between LINC00839 and miR-3666 expression in liver cancer tissues. Hepatocellular carcinoma cells MHCC97H were cultured in vitro and divided into si-NC group, si-LINC00839 group, miR-NC group, miR-3666 group, si-LINC00839+ anti-miR-NC group, and si-LINC00839+ anti-miR-3666 group. Methylthiazoletrazolium (MTT) method and clone formation experiment were used to detect cell proliferation. Transwell array was used to detect the cell migration and invasion. Western blot was used to detect the protein expressions of p21, E-cadherin and MMP-2. The double luciferase reporter gene experiment was used to verify the regulatory relationship between LINC00839 and miR-3666. Results: Compared with adjacent tissues, the expression level of LINC00839 in hepatocellular carcinoma tissues increased (2.82±0.27 vs. 0.96±0.10, P<0.001), but the expression level of miR-3666 decreased (0.23±0.02 vs. 1.01±0.10, P<0.001). The expression levels of LINC00839 and miR-3666 in liver cancer tissue were negatively correlated (r=-0.658, P<0.001). The survival rate of MHCC97H cells in the si-LINC00839 group [(53.91±5.41)% vs. (100.53±10.22)%], the number of clones formed (92.0±8.0 vs. 164.0±14.3), the number of migration (131.0±12.7 vs. 247.0±22.4), the number of invasion (66.0±6.4 vs. 120.0±11.6) and the protein level of MMP-2 (0.20±0.02 vs. 0.67±0.06) were lower than those in the si-NC group (P<0.001). However, the protein levels of p21 (0.76±0.07 vs. 0.25±0.02) and E-cadherin (0.78±0.08 vs. 0.14±0.01) were higher than those in the si-NC group (P<0.001). LINC00839 targeted and negatively regulated the expression of miR-3666. The survival rate of MHCC97-H cells in the miR-3666 group [(47.93±4.86)% vs. (100.11±10.21)%], the number of clone formation (78.0±7.7 vs. 166.0±15.9), the number of migration (117.0±12.1 vs. 250.0±25.0), the number of invasion (57.0±5.7 vs. 121.0±12.3) and the protein level of MMP-2 (0.16±0.01 vs. 0.69±0.07) were lower than those in the miR-NC group (all P<0.001). However, the protein levels of p21 (0.83±0.08 vs. 0.24±0.02) and E-cadherin (0.87±0.09 vs. 0.13±0.01)were higher than those in the miR-NC group (all P<0.001). The survival rate of MHCC97-H cells in the si-LINC00839+ anti-miR-3666 group [(89.94±9.05)% vs. (54.12±5.39)%], the number of clones (143.0±13.8 vs. 94.0±9.4), the number of migration (208.0±19.8 vs. 129.0±12.6), the number of invasion (108.0±10.1 vs. 65.0±6.4) and the protein level of MMP-2 (0.31±0.03 vs 0.66±0.06) were higher than those in the si-LINC00839+ anti-miR-NC group (P<0.001). However, the protein levels of p21 (0.31±0.03 vs. 0.74±0.07) and E-cadherin (0.28±0.03 vs. 0.80±0.08) were lower than those int the si-LINC00839+ anti-miR-NC group (P<0.001). Conclusion: Inhibition of LINC00839 expression may inhibit the proliferation, migration and invasion of hepatocellular carcinoma cells by targeting up-regulation of miR-3666 expression.
目的： 探讨LINC00839对肝癌细胞增殖、迁移和侵袭的影响及其机制。 方法： 采用实时荧光定量聚合酶链反应检测2016年2月至2018年11月于郑州大学附属肿瘤医院行手术治疗的38例肝癌患者的癌组织及相应癌旁组织中LINC00839和miR-3666的表达。体外培养肝癌细胞MHCC97H，分为si-NC组、si-LINC00839组、miR-NC组、miR-3666组、si-LINC00839+anti-miR-NC组和si-LINC00839+anti-miR-3666组，MTT法和克隆形成实验检测细胞增殖能力，Transwell实验检测细胞迁移和侵袭能力，Western blot检测细胞中p21、E-cadherin和基质金属蛋白酶2(MMP-2)蛋白表达。双荧光素酶报告基因实验验证LINC00839与miR-3666的调控关系。 结果： 肝癌组织中LINC00839的表达量为2.82±0.27，高于癌旁组织(0.96±0.10，P<0.001)，miR-3666的表达量为0.23±0.02，低于癌旁组织(1.01±0.10，P<0.001)。肝癌组织中LINC00839和miR-3666的表达水平呈负相关(r＝-0.658, P<0.001)。si-LINC00839组细胞存活率为(53.91±5.41)%，克隆形成数为(92.0±8.0)个，迁移细胞数为(131.0±12.7)个，侵袭细胞数为(66.0±6.4)个，MMP-2蛋白表达量为0.20±0.02，均低于si-NC组[分别为(100.53±10.22)%、(164.0±14.3)个、(247.0±22.4)个、(120.0±11.6)个和0.67±0.06，均P<0.001]，p21蛋白表达量为0.76±0.07，E-cadherin蛋白表达量为0.78±0.08，均高于si-NC组[分别为0.25±0.02和0.14±0.01，均P<0.001]。LINC00839靶向负调控miR-3666的表达。miR-3666组细胞存活率为(47.93±4.86)%，克隆形成数为(78.0±7.7)个，迁移细胞数为(117.0±12.1)个，侵袭细胞数为(57.0±5.7)个，MMP-2蛋白表达量为0.16±0.01，均低于miR-NC组[分别为(100.11±10.21)%、(166.0±15.9)个、(250.0±25.0)个、(121.0±12.3)个和0.69±0.07，均P<0.001]，p21蛋白表达量为0.83±0.08，E-cadherin蛋白表达量为0.87±0.09，均高于miR-NC组[分别为0.24±0.02和0.13±0.01，均P<0.001]。si-LINC00839+anti-miR-3666组细胞存活率为(89.94±9.05)%，克隆形成数为(143.0±13.8)个，迁移细胞数为(208.0±19.8)个，侵袭细胞数为(108.0±10.1)个，MMP-2蛋白表达量为0.66±0.06，均高于si-LINC00839+anti-miR-NC组[分别为(54.12±5.39)%、(94.0±9.4)个、(129.0±12.6)个、(65.0±6.4)个和0.31±0.03，均P<0.001]，p21蛋白表达量为0.31±0.03，E-cadherin蛋白表达量为0.28±0.03，均低于si-LINC00839+anti-miR-NC组[分别为0.74±0.07和0.80±0.08，均P<0.001]。 结论： 抑制LINC00839表达可能通过靶向上调miR-3666抑制肝癌细胞的增殖、迁移和侵袭能力。.
Keywords: Cell proliferation; Invasion; LINC00839; Liver neoplasms; MicroR-3666; Migration.