Long noncoding RNA OPA-interacting protein 5 antisense transcript 1 upregulated SMAD3 expression to contribute to metastasis of cervical cancer by sponging miR-143-3p: CHEN et al.

OBJECTIVES: SMAD3 is pivotal in the biology functions of various tumors. This study is aiming to study the relationship among SMAD3, long noncoding RNAs (lncRNAs) OPA-interacting protein 5 antisense transcript 1 (OIP5-AS1), and miR-143-3p, and their effects on cervical cancer. METHODS: In our research, real-time polymerase chain reaction and western blot assay were conducted to detect the expression level of messenger RNA and protein in tumor tissues and cells. Transfection of lncRNA OIP5-AS1, miR-143-3p, or SMAD3 was performed to investigate their potential effects on the function of cell as well as the relationship among them in cervical cell lines via 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide) together with transwell assays or dual-luciferase reporter assay respectively. RESULTS: SMAD3, lncRNA OIP5-AS1 expression is significantly enhanced in cervical cancer tissues and cell lines, but miR-143-3p was inhibited. LncRNA OIP5-AS1 is demonstrated to mediate the physiological process of cervical cancer cells. Moreover, silencing SMAD3 via siRNA suppressed cell number, viability, migration and invasion, whereas overexpression of OIP5-AS1 promoted these abilities. Furthermore, lncRNA OIP5-AS1 exert its function via sponging miR-143-3p to regulate SMAD3 expression. CONCLUSIONS: LncRNA OIP5-AS1 promoted SMAD3 expression via mediating miR-143-3p to promote migration and invasion of cervical cancer cells.