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Identification of a novel farnesoid X receptor agonist, Kaempferol-7-O-rhamnoside, a compound ameliorating drug-induced liver injury based on virtual screening and in vitro validation.
Toxicology and Applied Pharmacology 2022 September 21
Farnitol X receptor (FXR), a bile acid receptor, plays an essential role in maintaining bile acid and liver homeostasis and has been recognized as an essential target for drug-induced liver injury (DILI). This study aimed to identify potential FXR agonists by virtual screening, molecular dynamics (MD) simulation, and biological assays. First, an in-house Traditional Chinese medicine compound database was screened using a virtual approach based on molecular docking to reveal potential FXR agonists. Secondly, MD was applied to analyze the process of agonist binding. Finally, the acetaminophen (APAP)-induced L02 cells model evaluated the pharmacodynamic activity of agonists treating DILI. Virtual screening results showed that kaempferol-7-O-rhamnoside was confirmed as the FXR agonist. MD results showed that kaempferol-7-O-rhamnoside could stably bind the FXR. In addition, in vitro cell-based assay showed that kaempferol-7-O-rhamnoside could promote the expression of the FXR gene and inhibit the Cyp7a1 gene expression in APAP-induced cells, significantly reducing the activities of AST, AKP and ROS, and enhancing the expression of GSH. The current study confirmed that kaempferol-7-O-rhamnoside might improve liver function by promoting proliferation, ameliorating oxidative stress, and regulating FXR target genes as observed in vitro. Therefore, in this study, discovering the FXR agonist, kaempferol-7-O-rhamnoside, provides valuable guidance for developing novel drugs against DILI.
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