miR-30c抑制宫颈癌细胞恶性表型的分子机制研究

目的:探讨微小RNA(miR)-30c过表达抑制宫颈癌细胞恶性表型的分子机制。方法:运用Lipofectamine 2000转染法将pGenesil-1-miR-30 c质粒转染宫颈癌细胞系C33A、HeLa、SiHa和CaSki,以转染p-Geresil-1的细胞为阴性对照;运用TaqMan real-time PCR检测各组细胞中miR-30c的表达水平;采用MTT法、集落形成实验、Transwell法、Annexin V-FITC及流式细胞术分别测定细胞活力抑制率、集落形成能力、迁移率及凋亡率;Western blot检测Bax、Bcl-2、基质金属蛋白酶(MMP)-9、MMP-13和金属蛋白酶组织抑制物1(TIMP-1)的蛋白表达水平。结果:转染p Genesil-1-miR-30c质粒的宫颈癌细胞系中miR-30c表达水平均显著高于阴性对照组(P0.01);过表达miR-30 c的宫颈癌细胞活力抑制率显著高于阴性对照组(P0.05),细胞集落形成率和迁移率显著低于阴性对照组(P0.05);流式细胞术检测结果显示,miR-30c过表达的宫颈癌细胞凋亡率显著高于对照组(P0.05);Western blot结果显示miR-30 c过表达促进Bax和TIMP-1蛋白的表达,而抑制Bcl-2和MMP-13蛋白的表达(P0.05或P0.01)。结论 :miR-30 c过表达抑制宫颈癌细胞活力和迁移,诱导宫颈癌细胞凋亡,其机制与激活细胞凋亡通路及抑制MMP-13表达有关。

Mechanism of miR-30c over-expression inhibiting malignant phenotypes of cervical cancer cells

AIM:To investigate the molecule mechanism of microRNA (miR)-30c over-expression inhibiting malignant phenotypes of cervical cancer cells. METHODS:Cervical cancer cell lines C33A, HeLa, SiHa and CaSki were transfected with pGenesil-1-miR-30c plasmid using Lipofectamine 2000 kit, and the expression of miR-30c was determined by TaqMan real-time PCR. The cell viability inhibition rate, colony formation ability, migration rate and apoptotic rate were measured by MTT assay, colony formation assay, Transwell experiment, and flow cytometry with Annexin V-FITC staining. The protein expression of Bax, Bcl-2, matrix metalloproteinase (MMP)-9, MMP-13 and tissue inhibitor of metalloprotei-nase-1 (TIMP-1) was detected by Western blot. RESULTS:The expression levels of miRNA-30c in the cervical cancer cell lines transfected with pGenesil-1-miR-30c plasmid were significantly higher than those in negative control groups (cell lines transfected with pGenesil-1 plasmid) (P<0.01). Significantly increased cell viability inhibition rate, and decreased colony formation ability and migration rate were found in the cervical cancer cell lines over-expressing miR-30c as compared with negative control groups (P<0.05). The apoptotic rate in the cervical cancer cell lines over-expressing miR-30c was dramatically higher than that in control groups (P<0.05). Over-expression of miR-30c in cervical cancer cells promoted the protein expression of Bax and TIMP-1, and decreased the protein expression of Bcl-2 and MMP-13 (P<0.05 or P<0.01). CONCLUSION:Over-expression of miR-30c significantly inhibits the viability and migration, and induces apoptosis of cervical cancer cells. The mechanism may be related to activating apoptosis pathway and inhibiting MMP-13 protein expression.