Glucagon-like peptide-1 (GLP-1) mediates antidiabetogenic effects through the GLP-1 receptor (GLP-1R), which is targeted for the treatment of type 2 diabetes. Currently, GLP-1R agonists comprise a growing class of agents that deliver unprecedented efficacy in diabetes. We discovered a new small molecule GLP-1R agonist, HD-7671, and examined its efficacy in cynomolgus monkeys. The in vitro potency of HD-7671 was evaluated by measuring cAMP accumulation in cells with stable expression of human GLP-1R. HD-7671 stimulated cAMP accumulation and its EC50 value was 2.0 nM. In the cells transfected with human or cynomolgus monkey GLP-1R, HD-7671 promoted cAMP accumulation and its EC50 values for human and cynomolgus monkey GLP-1Rs were 4.5 nM and 7.1 nM, respectively. In contrast, HD-7671 showed no stimulatory activity on other animal species GLP-1Rs. In pharmacokinetic properties, the elimination half-life following oral administration(T1/2) was 0.99 hr in rats and 5.62 hr in cyno monkeys and Cmax was 10,183 ng/ml in rats and 1,423 ng/ml at 10mg/kg, respectively. To evaluate the in vivo insulinotropic effects of HD-7671, glucose stimulated insulin secretion was measured in compound treated in cyno monkeys undergoing an IVGTT. HD-7671 (dosed at 10mg/kg) decreased the blood glucose level and increased insulin secretion. These results demonstrate that HD-7671 has full agonistic activity on human and cynomolgus GLP-1R and improves glucose tolerance by stimulating insulin secretion. In conclusion, HD-7671 has potential as an orally active, non-peptide GLP-1R agonist for the treatment of type 2 diabetes. Disclosure M. Baek: None. D. Kim: None. C. Kim: Employee; Self; Hyundai Pharmaceutical Co., Ltd. D. Kim: Employee; Self; Hyundai Pharm. H. Choi: Employee; Self; Hyundai Pharm. corp. S. Kang: Employee; Self; Hyundai pharm.corp. H. Lee: Employee; Self; Hyundai Pharm. K. Lee: Employee; Self; Hyundai Pharm.

Certain polycyclic aromatic hydrocarbons (PAHs) have been reported to induce cytochrome P450 (CYP) 1A1 and 1A2. In the present study, the effects of six well-known PAHs, such as benzo[a]pyrene, benz[a]anthracene, dibenz[a,h]anthracene, chrysene, benzo[k]fluorancene and benzo[b]fluorancene, on the activities of hepatic and pulmonary CYP enzymes were investigated in male ICR mice. When mice were treated intraperitoneally with 3, 10 and 30 mg/kg of individual PAHs for 3 consecutive days, the activities of ethoxyresorufin- and methoxyresorufin-O-dealkylases were significantly and differentially induced in both liver and lung. Moreover, other CYP isozyme-associated monooxygenase activities were also induced significantly in liver and lung with characteristic induction profiles. Our present results suggest that individual PAHs might have inductive effects on CYP isozymes, and that the characteristic inductive effects of individual PAHs on certain CYP isozymes would be developed as a marker for determining exposure to certain PAHs.

-1-Furan-2-yl-3-pyridin-2-yl-propenone (FPP-3) has recently been synthesized and characterized to have an anti-inflammatory activity through the inhibition of the production of nitric oxide. In the present study, adverse effects of FPP-3 on hepatic functions were determined in female BALB/c mice. When mice were administered with FPP-3 at 125, 250 or 500 mg/kg for 7 consecutive days orally, FPP-3 significantly increased absolute and relative weights of liver with a dose-dependent manner. In addition, FPP-3 administration dramatically increased the hepatotoxicity parameters in serum at 500 mg/kg, in association of hepatic necrosis. FPP-3 significantly induced several phase I enzyme activities. To elucidate the possible mechanism(s) involved in FPP-3 induced hepatotoxicity, we investigated the hepatic activities of free radical generating and scavenging enzymes and the level of hepatic lipid peroxidation. FPP-3 treatment significantly elevated the hepatic lipid peroxidation, measured as the thiobarbituric acid-reactive substance, and the activity of superoxide dismutase. Taken together, the present data indicated that reactive oxygen species might be involved in FPP-3-induced hepatotoxicity.

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