Mechanistic studies on the alleviation of ANIT-induced cholestatic liver injury by Polygala fallax Hemsl. polysaccharides

• Published in: Journal of ethnopharmacology Vol. 328; p. 118108
• Main Authors: Guan, Guoqiang, Cao, Houkang, Tang, Zixuan, Zhang, Kefeng, Zhong, Mingli, Lv, Rui, Wan, Weimin, Guo, Fengyue, Wang, Yongwang, Gao, Ya
• Format: Journal Article
• Language: English
• Published: Ireland Elsevier B.V 28.06.2024
• Subjects: Bile acid homeostasis; Cholestatic liver injury; Polygala fallax Hemsl. polysaccharides; RNA sequencing; Traditional folk medicine; RNA sequencing; Traditional folk medicine; Bile acid homeostasis; Cholestatic liver injury; Polygala fallax Hemsl. polysaccharides
• ISSN: 0378-8741; 1872-7573
• DOI: 10.1016/j.jep.2024.118108

Polygala fallax Hemsl. is a traditional folk medicine commonly used by ethnic minorities in the Guangxi Zhuang Autonomous Region, and has a traditional application in the treatment of liver disease. Polygala fallax Hemsl. polysaccharides (PFPs) are of interest for their potential health benefits. This study explored the impact of PFPs on a mouse model of cholestatic liver injury (CLI) induced by alpha-naphthyl isothiocyanate (ANIT), as well as the potential mechanisms. A mouse CLI model was constructed using ANIT (80 mg/kg) and intervened with different doses of PFPs or ursodeoxycholic acid. Their serum biochemical indices, hepatic oxidative stress indices, and hepatic pathological characteristics were investigated. Then RNA sequencing was performed on liver tissues to identify differentially expressed genes and signaling pathways and to elucidate the mechanism of liver protection by PFPs. Finally, Quantitative real-time polymerase chain reaction (qRT-PCR) and Western blotting were used to verify the differentially expressed genes. Data analyses showed that PFPs reduced the levels of liver function-related biochemical indices, such as ALT, AST, AKP, TBA, DBIL, and TBIL. PFPs up-regulated the activities of SOD and GSH, down-regulated the contents of MDA, inhibited the release of IL-1β, IL-6, and TNF-α, or promoted IL-10. Pathologic characterization of the liver revealed that PFPs reduced hepatocyte apoptosis or necrosis. The RNA sequencing indicated that the genes with differential expression were primarily enriched for the biosynthesis of primary bile acids, secretion or transportation of bile, the reactive oxygen species in chemical carcinogenesis, and the NF-kappa B signaling pathway. In addition, the results of qRT-PCR and Western blotting analysis were consistent with those of RNA sequencing analysis. In summary, this study showed that PFPs improved intrahepatic cholestasis and alleviated liver damage through the modulation of primary bile acid production, Control of protein expression related to bile secretion or transportation, decrease in inflammatory reactions, and inhibition of oxidative pressure. As a result, PFPs might offer a hopeful ethnic dietary approach for managing intrahepatic cholestasis. [Display omitted] •The key targets for alleviating cholestasis are the regulation of primary bile acid production and bile secretion or transport.•Cholestatic liver injury can be attenuated by reducing the inflammatory response and inhibiting oxidative stress.•PFPs have anti-inflammatory, antioxidant, and hepatoprotective effects.•PFPs might offer a hopeful ethnic dietary approach for managing intrahepatic cholestasis.