title: Lack of dominant lethality in mice following 1-bromopropane treatment.
abstract: 1-Bromopropane (1-BP) is widely used in spray adhesives, precision cleaner, and degreaser. This study was conducted to investigate the potential of 1-BP to induce dominant lethality in mice. 1-BP was orally administered to males at doses of 300 and 600 mg/kg for 10 days before mating. Cyclophosphamide was used as a positive control (PC), which was administered intraperitoneally to males at 40 mg/kg for 5 days. The vehicle control (VC) group received corn oil only. Thereafter, males were mated with untreated females during six sequential mating periods of a week each. Males were sacrificed at the end of mating and so were the pregnant females on days 15-17 of gestation. Clinical signs, gross findings, mating index, gestation index, the numbers of corpora lutea, implantations, live fetuses, resorptions and dead fetuses, pre- and post-implantation losses, and dominant lethal mutation rate were examined. There were no treatment-related changes in clinical signs, gross findings, mating index, gestation index, number of corpora lutea and implantations, pre-implantation loss, live fetuses, resorptions, dead fetuses, post-implantation loss at any 1-BP doses tested. In the PC group, there were no treatment-related changes in mating index, gestation index, number of corpora lutea, and dead fetuses. However, a decrease in the number of implantations and an increase in pre-implantation loss were observed during the first 2 weeks as compared to those of the VC group. No treatment-related changes were observed in the third to sixth weeks. Increases in resorptions, fetal deaths and post-implantation loss, and a decrease in the number of live fetuses were observed in the first 3 weeks of the PC group compared to those of the VC group. However, no treatment-related changes were observed during the forth to sixth weeks. An increase in dominant lethal mutation rate was observed in 1-3 weeks of mating of the PC group, but there was no significant difference in 1-6 weeks of mating of the 1-BP treatment groups. In conclusion, 1-BP did not induce dominant lethality in mice. These results are in agreement with the report of Saito-Suzuki et al., demonstrating that no dominant lethality of 1-BP was observed in Sprague-Dawley rats.
authors.affiliation: Korea Institute of Toxicology, KRICT, Division of Toxicology, Daejeon 305-600, Republic of Korea.
authors.forename: Wook-Joon
authors.initials: WJ
authors.lastname: Yu
authors.forename: Jong-Choon
authors.initials: JC
authors.lastname: Kim
authors.forename: Moon-Koo
authors.initials: MK
authors.lastname: Chung
mesh_terms: D000022:Abortion, Spontaneous / Q000139:chemically induced; D000477:Alkylating Agents / Q000633:toxicity; D000818:Animals; D002869:Chromosome Aberrations / Q000139:chemically induced; D005260:Female; D005799:Genes, Dominant / Q000187:drug effects*; D005804:Genes, Lethal / Q000187:drug effects*; D006842:Hydrocarbons, Brominated / Q000633:toxicity; D040582:Inheritance Patterns / Q000187:drug effects; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D011247:Pregnancy; D013091:Spermatogenesis / Q000187:drug effects; D013094:Spermatozoa / Q000187:drug effects; D013737:Testis / Q000166:cytology / Q000187:drug effects; D013739:Testosterone / Q000097:blood
chemical_list: D000477:Alkylating Agents; D006842:Hydrocarbons, Brominated; D013739:Testosterone; C118559:1-bromopropane