• Tao Fan, Chao-Qi Wang, Xue-Tao Li, Hong Yang, Jun Zhou, and Ying-Jie Song.
• The People's Hospital of China Three Gorges University, The First People's Hospital of Yichang.
• J Coll Physicians Surg Pak. 2021 Aug 1; 31 (8): 937-940.

ObjectiveTo investigate the expression of miR-22-3p in breast cancer and the mechanism of targeting PLAGL2 to inhibit the invasion and migration in human breast cancer.Study DesignAn experimental study.Place And Duration Of StudyDepartment of Oncology and Department of General Surgery, The People's Hospital of China Three Gorges University, China, from March 2019 to December 2020.MethodologyThe miR-22-3p expression level in 41 paired human primary breast invasive ductal carcinoma tissues and para-cancer tissues was obtained by real-time fluorescence quantitative reverse transcriptase PCR (qRT-PCR). The effect of miR-22-3p on the proliferation of breast cancer cells was detected by growth curve method. Online software TargetScan was used to predict the target genes of miR-22-3p. The prediction results were verified by luciferase reporter gene assay and qRT⁃PCR.ResultsMiR-22-3p expression was significantly decreased in the breast cancer tissues than in para⁃carcinoma normal breast tissues (p<0.05). Over-expression of miR-22-3p can inhibit the proliferation of MCF-7 cells significantly. Pleomorphic adenoma gene-like protein 2(PLAGL2) is the predicted target gene of miR-22-3p. MiR-22-3p binds to its predicted target gene PLAGL2-3'UTR. The expression of miR-22-3p was negatively correlated with PLAGL2 in MCF-7 cells.ConclusionMiR-22-3p could suppress the proliferation of breast cancer by targeting PLAGL2. This suggests that miR-22-3p may be a strategy of choice for targeted therapy of breast cancer. Key Words: Breast cancer, MiR-22-3p, PLAGL2, Cell proliferation.

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