Abstract
To study the associations between exposure to vapours and aerosols of bitumen and genotoxic effects, a cross-sectional and cross-shift study was conducted in 320 exposed workers and 118 non-exposed construction workers. Ambient air measurements were carried out to assess external exposure to vapours and aerosols of bitumen. Hydroxylated metabolites of naphthalene, phenanthrene and pyrene were measured in urine, whereas (+)-anti-benzo[a]pyrene-7,8-diol-9,10-epoxide ((+)-anti-BPDE), 8-oxo-7,8-dihydro-2′-deoxyguanosine (8oxodGuo) and DNA strand breaks were determined in blood. Significantly higher levels of 8-oxodGuo adducts and DNA strand breaks were found in both pre- and post-shift blood samples of exposed workers compared to those of the referents. No differences between exposed workers and referents were observed for (+)-anti-BPDE. Moreover, no positive associations between DNA damage and magnitude of airborne exposure to vapours and aerosols of bitumen could be observed in our study. Additionally, no relevant association between the urinary metabolites of PAH and the DNA damage in blood was observed. Overall, our results indicate increased oxidative DNA damage in workers exposed to vapours and aerosols of bitumen compared to non-exposed referents at the group level. However, increased DNA strand breaks in bitumen workers were still within the range of those found in non-exposed and healthy persons as reported earlier. Due to the lack of an association between oxidative DNA damage and exposure levels at the workplaces under study, the observed increase in genotoxic effects in bitumen workers cannot be attributed to vapours and aerosols of bitumen.
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Acknowledgments
The Human Bitumen Study was initiated by the German Committee for Hazardous Substances (AGS) and the German Bitumen Forum and financially supported by: German Social Accident Insurance (DGUV), Eurobitume, Deutscher Asphaltverband e.V., Concawe, Zentralverband des Deutschen Dachdeckerhandwerks, Industrieverband Bitumen-, Dach- und Dichtungsbahnen e.V., Berufsgenossenschaft Rohstoffe und Chemische Industrie (BG RCI) and Aksys GmbH, Beratungsstelle Gussasphaltanwendungen (bga), BG BAU, Arbeitsgemeinschaft der Bitumenindustrie (Arbit). We thank all workers having participated in the Human Bitumen Study. We gratefully acknowledge the support of the field team especially Anne Flagge, Anja Molkenthin, Bianca Wachter, Dieter Höber, Gerd Zoubek and in parts of the study Klaus Schott (†) and Hans-Jürgen Schicker. We thank Anja Erkes, Brigitta Vosshans and Tina Teschner for technical assistance.
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Marczynski, B., Raulf-Heimsoth, M., Spickenheuer, A. et al. DNA adducts and strand breaks in workers exposed to vapours and aerosols of bitumen: associations between exposure and effect. Arch Toxicol 85 (Suppl 1), 53–64 (2011). https://doi.org/10.1007/s00204-011-0682-5
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DOI: https://doi.org/10.1007/s00204-011-0682-5