Effects of grape peel phenolics on lipid accumulation in sodium palmitate-treated HepG2 cells
Wenyu Cui, Ben Xu, Fuchun Chen, Weijun Shen, Fachun Wan, Anwei Cheng
Abstract
Phenolics were extracted from grape peels, and the compounds of grape peel phenolics (GPP) were identified by LC-MS/MS. From a perspective of dietary nutrition, this study aimed to evaluate the effect of GPP on lipid accumulation in sodium palmitate (PA)-treated HepG2 cells, and further to explore its mechanisms. HepG2 cells were induced by 0.4 mmol/L PA as an in vitro model of lipid accumulation. The results showed that GPP could significantly reduce the TG level and ROS production in PA-treated HepG2 cells. RT-qPCR and Western blotting analysis indicated that GPP supplementation can downregulate the mRNA and protein expression of lipogenesis factors and upregulate the expression of lipolysis factors in PA-treated cells. GPP reduced lipid accumulation and oxidative stress by activating the AMPK/mTOR/AKT signaling pathways, and the most significant effect was detected at 250 μg/mL GPP. Thus, GPP as a dietary phenolic, have the function to regulate lipid metabolism.