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Exposure of adult male and female DBA/2 mice to 3100 ppm benzene for 4 hr significantly increased the frequency of sister chromatid exchanges in bone marrow cells of both sexes, inhibited marrow cellular proliferation (but only in male mice), and did not significantly increase the frequency of chromosomal aberrations in either sex. Phenobarbital pretreatment synergistically interacted with benzene exposure to further increase sister chromatid exchanges in female mice, induce greater inhibition of cellular proliferation in male mice, and induce a significant level of chromatid-type chromosomal aberrations in both sexes. During the second day after exposure to benzene there was increased inhibition of cellular proliferation in male mice and both new DNA damage and persistance of old DNA damage in female mice. The differences in both the type and magnitude of the response of bone marrow cellular populations, as determined by different cytogenetic end points in male and female DBA/2 mice exposed to benzene or to phenobarbital and benzene, suggest not only that a metabolite of benzene is responsible for the observed effects, but that different metabolites may be involved in different end points.

proceedings of the national academy of sciences of the united states of america

Cytogenetic effects of inhaled benzene in murine bone marrow: induction of sister chromatid exchanges, chromosomal aberrations, and cellular proliferation inhibition in DBA/2 mice.