Knockdown and Overexpression Experiments to Investigate the Inhibitory Mechanism of Fuzheng Xiaozheng Prescription, an Effective Chinese Herbal Formula for the Clinical Treatment of Hepatocellular Carcinoma

Abstract

Fuzheng Xiaozheng prescription (FZXZP) is an effective formula for the treatment of different kinds of chronic liver diseases. However, its potential molecular mechanisms in treating hepatocellular carcinoma (HCC) have not been investigated thoroughly. The aim of this study is to elucidate the targets and intrinsic mechanisms of FZXZP and their active components for the treatment of HCC. The efficacy of FZXZP against HCC was clarified through a rat HCC model and HCC cell culture. Network pharmacology and molecular docking were utilized to predict the mechanism of action and effector components of FZXZP. The key mechanism and targets were verified by the construction of overexpression and knockout cell models. The results showed that FZXZP greatly delayed the development of HCC in vivo experiments, as evidenced by biochemical evaluations, H&E analyses and growth inhibition of HCC. FZXZP dramatically inhibited cell viability and proliferative capacity and induced the apoptosis of hepatoma cells in vitro. Moreover, network pharmacology analyses demonstrated that the EGFR family and apoptosis-related targets were found to be the most significant in bioinformatics analysis. Furthermore, the EGFR/STAT3 signal axis might be the most likely target of FZXZP in anti-HCC due to the fact that it could be down-regulated by FZXZP with an upward trend of Bax, Caspase-3, Caspase-8, Caspase-9 and an inverse trend of Bcl2. Importantly, the above targeted signal axis was finally validated by our knockdown and overexpression analyses. Meanwhile, flow cytometry and TUNEL staining also revealed that FZXZP significantly induced apoptosis in the EGFR-overexpressing HCC cell line. The molecular docking results revealed that the key effector components of FZXZP that exerted the above regulatory roles were wogonin and glycitein. All of these results suggest that FZXZP could significantly delay HCC development by inhibiting proliferation and promoting apoptosis of HCC cells, and the EGFR/STAT3 signal axis might be a critical signal axis of FZXZP in suppressing HCC progression.