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The objective of the present study was to identify the association between mir-143-3p and RalA-binding protein 1 (RALBP1), and their roles in regulating the development of ovarian cancer. Overexpression of RALBP1 induced apoptosis of the ovarian cancer cells, and developed ovarian cancer. In silico analysis and luciferase assay were used to identify whether RALBP1 was the target of mir-143-3p. Subsequently, real‑time PCR and western blotting were used to determine the expression level of mir-143-3p, RALBP1 mRNA and protein in different groups, furthermore, MTT assay and flow cytometry were used to detect the viability and apoptosis of cells in different treatment groups. We identified RALBP1 as a target gene of miR-143-3p using computational analysis, and the luciferase activity of cells transfected with wild-type RALBP1 and RALBP1 siRNA were much lower than the scramble control, however, the luciferase activity of cells transfected with mutant RALBP1 was similar with scramble control. The real-time PCR and western blot results suggested that the miR‑143-3p level was markedly lower in participants with ovarian cancer compared with normal control, while the expression of RALBP1 mRNA and protein were evidently overexpressed in participants with ovarian cancer compared with normal control. Furthermore, the RALBP1 mRNA and protein level in cells transfected with miR-143-3p mimics and RALBP1 siRNA were downregulated, while notably upregulated subsequent to transfection with miR-143-3p inhibitor, when compared with scramble control. Additionally, the viability of cells were inhibited following transfection with miR-143-3p mimics and RALBP1 siRNA, while notably promoted subsequent to transfection with miR-143-3p inhibitor. Apoptosis of cells were promoted following transfection with miR-143-3p mimics and RALBP1 siRNA, while notably inhibited subsequent to transfection with miR-143-3p inhibitor. These findings provide support that downregulation of the miR-143-3p is associated with a decreased risk of ovarian cancer.

Dysregulation of micro-143-3p and BALBP1 contributes to the pathogenesis of the development of ovarian carcinoma