title: Investigations on the in vitro and in vivo genotoxic potential of 5-vinyl-2-norbornene.
abstract: 5-Vinyl-2-norbornene (VNB: CAS no. 3048-64-4), an industrial chemical that produces hyaline droplet nephropathy in the male rat with associated alpha2u-globulin increases, was investigated in vitro and in vivo for its genotoxic potential. A Salmonella typhimurium reverse mutation assay (strains TA98, 100, 1535, 1537, 1538) was negative both without (dose range 0.003-0.3 mg per plate) and with (0.003-0.3 mg per plate) metabolic activation. A forward gene mutation test in Chinese Hamster Ovary (CHO) cells (HGPRT locus) did not show any significant concentration-related increases in mutation frequencies in the absence (0.01-0.1 mg ml[-1]) or presence (0.005-0.1 mg ml[-1]) of metabolic activation. In a sister chromatid exchange (SCE) test, VNB did not produce statistically significant or dose-related increases in the incidence of SCEs in the absence (0.02-0.06 mg ml[-1]) or presence (0.005-0.03 mg ml[-1]) of metabolic activation. A bone marrow chromosome aberration test was conducted in groups of 10 male and 10 female Sprague-Dawley rats exposed for 6 hr/day for 5 consecutive days to mean (+/- SD) VNB vapor concentrations of 0 (air control), 48.1 +/- 1.29, 146 +/- 9.2, or 336 +/- 8.5 ppm. Marrow was collected 6 and 24 hr after the final exposure. No statistically significant or dose-related increases in chromosomal aberrations occurred in the VNB-exposed animals. 5-Vinyl-2-norbornene did not show any potential for genotoxic activity with this in vitro-in vivo battery of tests.
authors.affiliation: Bushy Run Research Center, Union Carbide Corporation, Export, PA, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Vergnes
authors.forename: B
authors.initials: B
authors.lastname: Ballantyne
mesh_terms: D000818:Animals; D016466:CHO Cells / Q000187:drug effects*; D002869:Chromosome Aberrations; D006224:Cricetinae; D004305:Dose-Response Relationship, Drug; D066298:In Vitro Techniques; D008297:Male; D009152:Mutagenicity Tests; D009154:Mutation / Q000187:drug effects*; D009636:Norbornanes / Q000633:toxicity*; D051381:Rats; D012486:Salmonella typhimurium / Q000187:drug effects* / Q000235:genetics; D012854:Sister Chromatid Exchange / Q000187:drug effects*
chemical_list: C108263:5-vinyl-2-norbornene; D009636:Norbornanes