© 1998 Oxford University Press
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Male Reproductive Tract Malformations in Rats Following Gestational and Lactational Exposure to Di(n-butyl) Phthalate: An Antiandrogenic Mechanism?
Chemical Industry Institute of Toxicology 6 Davis Drive, Research Triangle Park, North Carolina 27709
Received November 12, 1997; accepted January 23, 1998
Di(n-butyl) phthalate (DBP), a widely used plasticizer suspected of having estrogenic properties, was investigated for its effects on the prenatal and early neonatal development of the reproductive tract. Pregnant CD rats (n = 10) were given DBP at 0, 250, 500, or 750 mg/kg/day (p.o.) throughout pregnancy and lactation until their offspring were at postnatal day 20. Maternal body weights throughout the dosing period were comparable in all groups. At 750 mg/kg/day, the number of live pups per litter at birth was decreased and maternal effects on pregnancy and postimplantation loss are likely to have occurred. Anogenital distance was decreased at birth in the male offspring at 500 and 750 mg/kg/day. The epididymis was absent or underdeveloped in 9, 50, and 71% of adult offspring (100 days old) at 250, 500, and 750 mg/kg/day, respectively, and was associated with testicular atrophy and widespread germ cell loss. Hypospadias occurred in 3, 21, and 43% of males and ectopic or absent testes in 3,6, and 29% of males at 250, 500, and 750 mg/kg/day, respectively. Absence of prostate gland and seminal vesicles as well as small testes and seminal vesicles were noted at 500 and 750 mg/kg/day. Vaginal opening and estrous cyclicity, both estrogen-dependent events, were not affected in the female offspring, although low incidences of reproductive tract malformations were observed at 500 and 750 mg/kg/day. In the male offspring, DBP produced the same spectrum of effects elicited by the antiandrogen flutamide. Thus, DBP specifically impaired the androgen-dependent development of the male reproductive tract, suggesting that DBP is not estrogenic but antiandrogenic in the rat at these high dose levels. For human risk assessment, determining if this toxicity is metabolite-mediated will be critical, since marked species differences in metabolism exist.
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