MiR‐195‐5p facilitates the proliferation, migration, and invasion of human trophoblast cells by targeting FGF2

Abstract Background Preeclampsia (PE), the most significant adverse exposure to cardiovascular risk during pregnancy, is one of the three major factors contributing to maternal and fetal mortality and the leading cause of preterm birth. Recently, various miRNAs have been reported to participate in PE occurrence and development. Nevertheless, the regulatory impact of miR‐195‐5p in PE is still indistinct. Methods Quantitative realtime‐PCR (qRT‐PCR), western blot, and fluorescence in situ hybridization (FISH) assay were performed to examine miR‐195‐5p and FGF2 expressions in PE serum samples or HTR‐8/SVneo and TEV‐1 cells. CCK8, flow cytometry, wound scratch, and transwell assays were conducted to determine cell viability, cycle, apoptosis, migration, and invasion. Dual‐luciferase reporter assay unveiled the relationship between miR‐195‐5p and FGF2. Migration‐related and invasion‐related protein expressions were measured by western blot assay. Results miR‐195‐5p was prominently downregulated while FGF2 was increased in serum samples from PE patients and hypoxia‐treated human trophoblast cells. FGF2 was predicted as a downstream target of miR‐195‐5p and targeted association was verified by dual‐luciferase reporter assay. Functional experiments elaborated that miR‐195‐5p could facilitate trophoblast cell proliferation and metastasis but hinder cell cycle and apoptosis. Inversely, overexpressing of FGF2 could reverse the effects of miR‐195‐5p on trophoblast cell growth. Discussion miR‐195‐5p was decreased in PE serum samples and cell lines, serving as a potential biomarker in protecting PE exacerbation by targeting FGF2.