miR-105靶向负调控KIFC1抑制非小细胞肺癌细胞增殖、迁移和侵袭能力

miR-105 inhibits cell proliferation, migration and invasion abilities in non-small-cell lung cancer cells by targeting and negative regulation of KIFC1

目的:研究微小RNA-105(miR-105)对非小细胞肺癌细胞增殖、迁移和侵袭的影响,并探讨其机制。方法:运用RT-qPCR法检测非小细胞肺癌组织及癌旁组织和细胞中miR-105和驱动蛋白家族成员C1(KIFC1) mRNA的表达;用Western blot检测非小细胞肺癌组织及癌旁正常组织和细胞中KIFC1蛋白的表达。将细胞分为miR-105组(转染miR-105 mimics)、miR-NC组(转染mimics阴性对照序列)、inhibitor-NC组(转染inhibitor阴性对照序列)、inhibitor-miR-105组(转染miR-105 inhibitor)、si-NC组(转染阴性对照siRNA)、si-KIFC1组(转染KIFC1 siRNA)、miR-105+vector组(miR-105 mimics和pcDNA 3.1共转染)和miR-105+KIFC1组(miR-105 mimics和pcDNA 3.1-KIFC1共转染),均以脂质体法转染至非小细胞肺癌H460细胞;MTT法检测各组细胞活力;Transwell法检测各组细胞的迁移和侵袭能力;双萤光素酶报告基因检测实验检测各组细胞萤光素酶相对活性。结果:与癌旁组织相比,非小细胞肺癌组织中的miR-105表达显著降低,KIFC1的表达显著升高(P<0.05);与人正常胚肺成纤维细胞MRC-5相比,H460细胞中的miR-105表达显著降低,KIFC1的表达显著升高(P<0.05);miR-105可降低野生型KIFC1的H460细胞萤光素酶相对活性,且负向调控KIFC1的蛋白表达。过表达miR-105或敲减KIFC1表达均可显著抑制H460细胞的增殖、迁移和侵袭能力,且过表达KIFC1可逆转miR-105对细胞活力、迁移和侵袭能力的抑制作用。结论:miR-105可抑制非小细胞肺癌细胞增殖、迁移和侵袭,其机制与靶向负调控KIFC1的表达有关。

AIM: To study the effects of microRNA-105(miR-105) on the cell proliferation, migration and invasion abilities of non-small-cell lung cancer(NSCLC) H460 cells, and further to explore its mechanism. METHODS: The expression of miR-105 and kinesin family member C1(KIFC1) mRNA in the NSCLC tissues and adjacent tissues and cells was detected by RT-qPCR. The protein expression of KIFC1 in the NSCLC tissues, adjacent normal tissues and cells was determined by Western blot. The H460 cells were divided into miR-105 group(transfection with miR-105 mimics), miR-negative control(NC) group(transfection with miR-NC), inhibitor-NC group(transfection with NC of inhibitor), inhibitor-miR-105 group(transfection with miR-105 inhibitor), si-NC group(transfection with NC siRNA), si-KIFC1 group(transfection with KIFC1 siRNA), miR-105+vector group(miR-105 mimics and pcDNA 3.1 co-transfection) and miR-105+KIFC1 group(miR-105 mimics and pcDNA 3.1-KIFC1 co-transfection). The cell proliferation was measured by MTT assay and colony formation assay. The migration and invasion abilities were detected by Transwell methods. The relative luciferase acitivity was evaluated by double luciferase reporter assay. RESULTS: Compared with the adjacent tissues, the expression of miR-105 was significantly decreased and the expression of KIFC1 was significantly increased in NSCLC tissues(P<0.05). Compared with human normal embryonic lung fibroblasts MRC-5, the expression of miR-105 in the H460 cells was significantly decreased, and the expression of KIFC1 was significantly increased(P<0.05). miR-105 inhibited the relative luciferase activity of H460 cells with wild-type KIFC1 and negatively regulated the protein expression of KIFC1. Over-expression of miR-105 and knockdown of KIFC1 expression significantly inhibited the proliferation, migration and invasion abilities of H460 cells. Over-expression of KIFC1 reversed the inhibitory effect of miR-105 on the cell proliferation, migration and invasion abilities of H460 cells. CONCLUSION: miR-105 inhibits the proliferation, migration and invasion abilities of NSCLC cells. The mechanism may be related to targeting and negatively regulating expression of KIFC1.