P-32 POST-LABELING DETECTION OF DNA-ADDUCTS IN MONONUCLEAR-CELLS OF WORKERS OCCUPATIONALLY EXPOSED TO STYRENE

P-32-Post-labeling was used to analyze for the presence of DNA adducts in 47 workers exposed to styrene in a boat manufacturing facility. In dividual airborne exposures measured several times over the course of 1 year ranged from 1 to 235 mg/m(3) with a mean value of 65.6 mg/m(3). Two adducts were detected in the DNA of mononuclear cells of these wo rkers. The following levels of adducts were detected: adduct 1, range 0.6-102 x 10(-8) (mean 15.8 x 10(-8)); adduct 2, range 0.1-70.9x10(-8) (mean 14.2x10(-8)). Significant linear relationships were found betwe en styrene exposure and both DNA adducts (adduct 2, r = 0.330, P = 0.0 12; adduct 1, r = 0.244, P = 0.049). Co-chromatography experiments ide ntified DNA adduct 1 in the exposed samples as phenylethyl)-2'-deoxygu anosine-3',5'-bisphosphate. DNA adduct 2 remains unidentified. No sign ificant linear relationships were observed between the level of DNA ad ducts and sister chromatid exchanges, possibly because of the poor pre cision of the P-32-post-labeling assay (the estimated coefficients of variation for adducts 1 and 2 were 2.54 and 1.96, respectively). These results demonstrate that occupational exposure to styrene results in the formation of DNA adducts in human mononuclear cells.