Atractylenolide III predisposes miR-195-5p/FGFR1 signaling axis to exert tumor-suppressive functions in liver cancer

Abstract Background: Antineoplastic activity of atractylenolide III (ATL) has been reported in several malignant tumors. However, its activity has not been completely clarified in hepatocellular carcinoma (HCC). Herein, anti-cancer effects and underlying molecular mechanisms of ATL were investigated in HCC cells in vitro. Methods: Cell viability was evaluated by CCK-8 assay. Cell migration and invasion were evaluated using the transwell assay. TUNEL staining was performed to evaluate cell apoptosis. Protein expression was measured by western blotting analysis. On-line database TargetScan and luciferase reporter gene analysis were performed to validate FGFR1 as a target of miR-195-5p. Results: HepG2 and SMMC7721 cell growth, migration and invasion were inhibited by ATL treatment in a dose-dependent pattern. ATL treatment induced apoptosis of HepG2 and SMMC7721 cells. Intriguingly, ATL treatment unexpectedly inhibited FGFR1 protein expression in HepG2 and SMMC7721 cells. Knockdown of FGFR1 inhibited proliferation, migration and invasion, and evoked apoptosis of HepG2 and SMMC7721 cells. We also found that ATL treatment could increase the expression of miR-195-5p, which as a post-transcriptional targeted FGFR1. In HCC tissues, miR-195-5p expression is negatively correlated with FGFR1. Furthermore, the anti-proliferative and pro-apoptotic roles of miR-195-5p were neutralized by overexpressed FGFR1 in HCC cells. Conclusion: ATL effectively repressed growth and induced apoptosis of human HCC cells through the up-regulation of miR-195-5p to down-regulate FGFR1 expression.