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Pure Appl. Chem. 75(11/12), 2497-2501, 2003

Pure and Applied Chemistry

Vol. 75, Issues 11-12

Enhanced one-generation reproductive toxicity study in rats for detecting endocrine-disrupting effects of chemicals

H. Aoyama and K. Suzuki

Laboratory of Reproductive Toxicology, Institute of Environmental Toxicology, Japan;
Department of Veterinary Physiology, Nippon Veterinary and Animal
Science University, Japan

Abstract: An enhanced one-generation reproductive toxicity study in rats without adjusting a litter size during the lactation period is proposed as a rapid and reliable bioassay for providing the data concerning adverse and/or low-dose effects of suspected endocrine disruptors. In this study, pregnant females are treated with the test substance from gestation day 0 through lactation day 21, in principle. F1 offspring from one-half of the litters in each dose group are killed and necropsied at weaning, while those from the remaining litters are examined for sexual maturation, estrous cyclicity, and/or sperm production. A series of pilot studies with ethynylestradiol as a reference chemical have suggested that the exposure of estrogenic chemicals during the early gestation period is critical for detecting effects on fertilization and/or implantation of eggs and survival of implants, and that expression of some genes including AR in the prostate and IGF-1 in the uterus of F1 offspring may be sensitive markers for monitoring potential estrogenic effects of the test compound.

*Report from a SCOPE/IUPAC project: Implication of Endocrine Active Substances for Human and Wildlife (J. Miyamoto and J.Burger, editors). Other reports are published in this issue, pp. 1617-2615.


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