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Chronic toxicity in monkeys with the thiazolidinedione antidiabetic agent troglitazone.

The antidiabetic agent troglitazone was given to groups of 4 cynomolgus monkeys per sex at 300, 600, or 1200 mg/kg daily by gavage for 52 weeks. A group of 4 monkeys per sex received vehicle alone and served as controls. Emesis and soft stool or diarrhea occurred sporadically in all troglitazone-treated groups, but did not compromise animal health. There were no effects on body weight or food consumption, or ophthalmologic, electrocardiographic, or echocardiographic parameters. Erythrocyte count, hemoglobin, and hematocrit decreased 8% to 16% in males at all doses and serum cholesterol decreased 30% to 46% in both sexes at all doses. Urinary ketones were increased in several animals at 600 and 1200 mg/kg. Absolute and relative liver weights increased at all doses in both sexes by 40% to 71%. The only microscopic change attributable to troglitazone treatment was minimal to mild bile duct hyperplasia in males at all doses and in females at 600 and 1200 mg/kg. No differences in systemic exposure were apparent between sexes. Over the dose range tested, AUC(0-24) values were 27 to 102 micrograms.hr/ml of troglitazone, 401 to 2060 micrograms.hr/ml of its sulfate conjugate, and 34 to 312 micrograms.hr/ml of its quinone metabolite. Therefore, oral administration of troglitazone to monkeys at 300, 600, and 1200 mg/kg for 52 weeks resulted in significant systemic exposure, with only minimal gastrointestinal, hematologic, and hepatic effects.[1]

References

  1. Chronic toxicity in monkeys with the thiazolidinedione antidiabetic agent troglitazone. Rothwell, C., McGuire, E.J., Altrogge, D.M., Masuda, H., de la Iglesia, F.A. The Journal of toxicological sciences. (2002) [Pubmed]
 
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