Cytogenetic damage in buccal epithelia and peripheral lymphocytes of young healthy individuals exposed to ozone

Mutagenesis
Connie ChenNina Holland

Abstract

Ozone (O(3)) is an important component of air pollution and a potent oxidant of biomolecules. To address the hypothesis that elevated ambient O(3) can induce cytogenetic damage in healthy people, we collected buccal cells from two groups of students (N = 126) from University of California, Berkeley, in the spring and again in the fall. One group spent their summer in the Los Angeles (LA) area where summer O(3) concentrations are significantly higher than in the San Francisco Bay (SF) area, and another remained in SF. During the school year, all students were exposed to low O(3) levels in SF. The micronucleus assay in a total of 611,000 buccal cells demonstrated that, in the fall, micronuclei (MN) in normal cells for the LA group had increased 39% relative to levels in the spring (1.52 and 0.87 MN/1,000 cells, respectively, P = 0.001). Students who spent the summer in SF had a 12.7% increase (P = 0.48). A similar effect of season was seen in degenerated buccal cells for the LA group (3.23 versus 1.88 MN/1,000 cells, P = 0.003). LA but not SF subjects also had more degenerated cells in the fall sample (P = 0.003). These findings were paralleled by an increase in MN and nucleoplasmic bridges in lymphocytes and MN in buccal cells i...Continue Reading

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