Phenols fragment of Veronica ciliata Fisch. ameliorate free radical-induced nonalcoholic fatty liver disease by mediating PI3K/Akt signaling pathway

Abstract

Ethnopharmacological relevance: Veronica ciliata Fisch. is used in numerous of Tibetan medicine prescriptions because of its hepatoprotective effect.

Aims of this study: Here, we aimed to investigate the hepatoprotective effect and mechanism of phenolic fraction (PF) of V. ciliata Fisch. on liver injury induced by free radical.

Materials and methods: BRL 3A cells were pre-treated with PF and luteolin (Lut) following tert-butyl hydroperoxide (t-BHP) treatment. The cell viability, lactate dehydrogenase (LDH) levels, reactive oxygen species (ROS) generation, apoptosis, cell cycle and autophagy were analyzed. Apoptotic, inflammatory, and autophagy,- related proteins were analyzed using Western blotting. The combination of molecular docking and drug affinity targeting experiments (DARTS) were first utilized to analysis the target protein of Lut.

Results: PF effectively suppressed t-BHP-induced apoptosis caused by mitochondrial dysfunction, which were associated with inhibiting ROS generation. Further investigation indicated that PF significantly suppressed apoptosis, inflammation, and autophagy by regulating the expression of related proteins. The results of molecular docking and drug affinity targeting experiments (DARTS) revealed that PI3K was the target protein of PF and Lut. Further studies have shown that PF relieved liver injury induced by t-BHP via suppressing phosphorylated expression of PI3K.

Conclusion: Our results indicate that PF effectively protect against hepatotoxicity induced by t-BHP through inhibiting the abnormal activation of PI3K-Akt signaling pathway and highlight the health benefits of PF regarding oxidative stress, proving it to be an important source of bioactive compounds associated with Nonalcoholic fatty liver disease (NAFLD).

Keywords: NAFLD; PI3K; Phenolic fraction; Reactive oxygen species; Veronica ciliata Fisch..