[Protective effect of Lonicerae japonicae flos extract against doxorubicin-induced liver injury in mice].

Objective: To explore the mechanism underlying the protective effect of Lonicerae japonicae flos (LJF) extract against doxorubicin (DOX) -induced liver injury in mice.

Methods: Network pharmacology methods were used to obtain the intersection genes between LJF targets and disease targets, based on which the protein-protein interaction (PPI) network was constructed using STRING database for screening the core targets using Cytoscape software. DAVID database was used for bioinformatics analysis, and the core components and core targets were verified using molecular docking study. In a mouse model of DOX-induced liver injury, the effect of LJF extract on liver pathologies, serum levels of ALT and AST, and hepatic expressions of HYP, ROS, TNF-α, IL-6, COL-Ⅳ and P53 proteins were evaluated using HE and Masson staining, ELISA, and Western blotting.

Results: We identified 12 core targets from 43 intersection genes involving cancer pathway, IL-17 signaling pathway, and TNF signaling pathways. Molecular docking study suggested that 10 core components of LJF could bind to different core targets. The mice with DOX-induced liver injury showed elevated serum AST and ALT levels with obvious liver injury and fibrosis, increased ROS content, and enhanced expressions of TNF-α, IL-6, HYP, COL-Ⅳ and P53 proteins in the liver tissue. All these changes in the mouse models were significantly alleviated by treatment with LJF extract, suggesting obviously lowered levels of oxidative stress, inflammation and fibrosis in the liver tissues.

Conclusion: LJF extract is capable of alleviating DOX-induced liver injury in mice by downregulating Trp53, TNF and IL-6 to reduce liver oxidative stress, inflammation and fibrosis.