Improvement of dyslipidemia, insulin sensitivity, and energy balance by a peroxisome proliferator-activated receptor α agonist

Peroxisome proliferator-activated receptor alpha (PPAR alpha) is a member of the nuclear receptor family of ligand-activated transcription factors. It plays an important role in the regulation of genes involved in lipid metabolism and transport. Compound A is a potent and orally active PPAR alpha agonist that activated both human and rat PPARa receptors. The compound induced the expression of genes involved in fatty acid metabolism in a rodent hepatoma cell line and in the liver of db/db mouse. The ability of compound A to stimulate fatty acid P-oxidation was demonstrated in human hepatocytes and human skeletal muscle cells, which confirmed a functional activation of PPAR alpha-mediated activities. Compound A was shown to be a more potent and efficacious antidyslipidemic agent in atherogenic rat and db/db mouse models as compared with fenofibrate. The increase in high-density lipoprotein cholesterol levels by compound A was at least partially due to an increase in serum apolipoprotein A-I protein concentrations in human PPARa transgenic mouse. The triglyceride-lowering effect was further confirmed in a higher species, obese dog models. In addition, compound A dose-dependently ameliorated hyperglycemia and hyperinsulinemia, and improved glucose tolerance in db/db mice. In a diet-induced obesity mouse model, compound A decreased body weight mainly by increasing energy expenditure and reducing fat deposition. In conclusion, the novel and potent PPARa agonist improves lipid profile, insulin sensitivity, and energy balance in animal models. (C) 2008 Elsevier Inc. All rights reserved.