Elsevier

Toxicology

Volume 113, Issues 1–3, 28 October 1996, Pages 120-127
Toxicology

Male-mediated F1 effects in mice exposed to 1,3-butadiene

https://doi.org/10.1016/0300-483X(96)03436-1Get rights and content

Abstract

We examined the effects on dominant lethality, the incidence of fetal abnormalities and tumour incidence in surviving offspring of acute and subchronic exposure of male mice by inhalation to the industrial monomer, 1,3-butadiene. In the acute study, CD-1 mice were exposed to atmospheres containing 0 (n = 25), 1250 (n = 25) or 6250 ppm (n = 50) for 6 h, and each male was caged 5 days later for 1 week with two untreated virgin females. One of the females was killed humanely on day 17 of gestation. The other was allowed to deliver and rear her litter and the litters were monitored throughout adulthood. The killed female was examined for the number of live foetuses, the number of post implantation deaths (early and late) and the number and type of any gross malformations. In the subchronic study, males were exposed to 0 (n = 25), 12.5 (n = 25) or 1250 (n = 50) for 6 h per day on 5 days per week for 10 weeks and then mated the next morning. Mating and observation details were as for the acute study. Acute exposure to butadiene resulted in only a small decrease in implantations; after 10 weeks' subchronic exposure with either the high or low concentration, however, a wide variety of statistically significant effects was seen. At 1250 ppm, the number of implantations was reduced, dominant lethal mutations were induced, and the incidences of early and late deaths were increased; some of the live foetuses were malformed. The low dose also increased the frequency of malformations and late deaths but it did not affect the number of early deaths. Skeletal examination of malformed foetuses, randomly selected normal litter mates and controls confirmed the abnormalities seen at necropsy in malformed foetuses. However, karyotypic analysis of foetal liver from malformed foetuses, randomly selected normal litter mates and controls showed no karyotypic abnormalities. The number of gross suspected tumours in the F1 adults did not appear to reveal an increase over control values. Thus, butadiene is mutagenic in the germ cells of male mice, as shown by the induction of dominant lethality at 1250 ppm, and the frequencies of late deaths and congenital malformations appear to be increased at the subchronic level of 12.5 ppm and skeletal examination of malformed foetuses confirmed the macroscopic abnormalities.

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