Research article: Effects of glycyrrhizic acid on peroxisome proliferator-activated receptor gamma (PPARγ), lipoprotein lipase (LPL), SerumLipid and HOMA-IR in rats

Abstract

Studies on ligand binding potential of glycyrrhizic acid, a potential agonist to PPARγ, displayed encouraging results in amelioration of metabolic syndrome. The regulation of gene cassettes by PPARγ affects glucose homeostasis, lipid, lipoprotein metabolism and adipogenesis. This study was performed to determine the effects of GA on total PPARγ and LPL expression levels, lipid parameters and HOMA-IR. Oral administration of 100 mg/kg GA for 24 hours resulted in an increase in insulin sensitivity with decreases in blood glucose, serum insulin and HOMA-IR. Improvement in serum lipid parameters was also observed with a decrease in triacylglycerol, total cholesterol and LDL-cholesterol and an elevation in HDL-cholesterol. GA administration also resulted in upregulation of total PPARγ and LPL expression levels in the visceral and subcutaneous adipose tissues, abdominal and quadriceps femoris muscles, as well as liver and kidney, with a significant up-regulation only in the visceral adipose tissue, abdominal and quadriceps femorismuscles. Thus, oral administration of 100 mg/kg GA for 24 hours improved insulin sensitivity and lipid profiles and induced upregulation of total PPARγ and LPL expression levels in all studied tissues. Copyright © 2010 Chia Yoke Yin et al.