miR-181a-5p通过HOXB4抑制骨肉瘤细胞HOS增殖和迁移

目的: 研究miR-181a-5p对HOS骨肉瘤细胞增殖、周期和迁移的影响及其机制。方法: 采用实时定量PCR检测hFOB1.19成骨细胞和HOS、U2OS、MG63骨肉瘤细胞系中miR-181a-5p及HOXB4的表达情况。利用Lipofectamine 2000将miR-181a-5p mimics和miR-181a-5p inhibitor分别转染至人骨肉瘤HOS细胞中(分别为过表达组和抑制剂组),并设置miR 阴性对照组;CCK-8法检测各组细胞的增殖能力变化,流式细胞术检测各组细胞的细胞周期变化,划痕愈合实验以及Transwell迁移实验检测各组细胞的迁移能力变化。Targetscan网站预测miR-181a-5p的靶向基因,并通过双荧光素酶报告基因系统及Western blot验证靶向关系。结果: 与成骨细胞hFOB1.19相比,miR-181a-5p在骨肉瘤细胞HOS、U2OS和MG63中低表达(P<0.05),而HOXB4在骨肉瘤中高表达(P<0.05)。与阴性对照组相比,过表达miR-181a-5p抑制骨肉瘤HOS细胞的增殖和迁移能力,并且处于细胞周期S期的细胞减少(P<0.05)。敲低miR-181a-5p促进骨肉瘤HOS细胞的增殖和迁移能力,并且处于S期细胞增加(P<0.05)。生物信息学预测及双荧光素酶报告基因系统验证HOXB4为miR-181a-5p的下游靶基因(P<0.05)。Western blot显示,过表达miR-181a-5p的HOS细胞中,HOXB4蛋白表达低于阳性对照组(P<0.05),而敲低miR-181a-5p的HOS细胞中HOXB4蛋白表达高于对照组(P<0.05)。结论: miR-181a-5p在骨肉瘤细胞中低表达,过表达miR-181a-5p能够抑制骨肉瘤细胞HOS增殖、周期和迁移能力,该作用可能通过靶向HOXB4发挥作用。

miRNA-181a-5p inhibits proliferation and migration of osteosarcoma cell line HOS by targeting HOXB4

Objective: To study the effects and mechanisms of miR-181a-5p on the proliferation,cycle and migration of HOS osteosarcoma cells. Methods: Real-time quantitative PCR was used to detect the expression of miR-181a-5p and HOXB4 in osteoblast hFOB1.19 cell line and osteosarcoma cell lines (HOS,U2OS,MG63). miR-181a-5p mimics and miR-181a-5p inhibitors were respectively transfected into HOS cells by Lipofectamine 2000,and miR NC group was set as control group. CCK-8 method was used to detect the change in cell proliferation. Flow cytometry was used to detect the changes in cell cycles. Wound healing experiments and Transwell migration experiments were used to detect the changes in cell migration ability. The target gene of miR-181a-5p was predicted by Targetscan website and validated by Dual-luciferase reporter gene system and Western blot. Results: Compared with osteoblast hFOB1.19,miR-181a-5p was low expressed in osteosarcoma cells HOS,U2OS,and MG63(P<0.05),while HOXB4 was high expressed in osteosarcoma cells HOS,U2OS,and MG63(P<0.05). Compared with the miR NC group,over expression of miR-181a-5p inhibited the proliferation and migration of osteosarcoma HOS cells,and the number of cells in S phase decreased(P<0.05). However,knockdown miR-181a-5p promoted the proliferation and migration of osteosarcoma HOS cells,the cells in S phase increased(P<0.05). Bioinformatics prediction and Dual-luciferase reporter gene system validate HOXB4 as a downstream target gene of miR-181a-5p(P<0.05). Western blot showed that miR-181a-5p over expression or knockdown significantly down-regulated or up-regulated HOXB4 expressions in the HOS cells respectively(P<0.05). Conclusion: miR-181a-5p is down expressed in osteosarcoma cells,and over-expression miR-181a-5p inhibits the proliferation,cell cycle and migration ability of osteosarcoma cells by targeting HOXB4.