Effects of pressed degreased walnut meal extracts on lipid metabolism in postnatally monosodium glutamate-induced mice and 3T3-L1 preadipocytes

Abstract

Twelve polyphenols were identified in the extracts (WMP) from cold pressed degreased walnut meal by UPLC-ESI-MS, among which glansreginin A, gallic acid, ellagic acid and ellagic acid 4-O-xyloside took up the majority proportion. The potential of WMP to improve glucose and lipid metabolism was investigated by the postnatally monosodium glutamate (MSG)-induced mice. The levels of serum total cholesterol, triacylglycerols, low-density lipoprotein cholesterol, glucose, and adiponectin, ascending in the MSG group, had a significant decrease after the WMP treatment with the corresponding increase of high-density lipoprotein cholesterol level. The administration of WMP suppressed the weight gain and fat accumulation. Furthermore, activities of alanine transaminase, aspartate transaminase and malondialdehyde level decreased obviously compared to the MSG group, however, activities of glutathione peroxidase and superoxide dismutase went higher after the WMP treatment in liver. Our findings have posed WMP the potential to treat obesity and related disorders by improving glucose and lipid metabolism.

Keywords

• Walnut meal
• Polyphenols
• Lipid metabolism
• Monosodium glutamate-induced mice
• 3T3-L1 cell