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Utility of urinary 1-naphthol and 2-naphthol levels to assess environmental carbaryl and naphthalene exposure in an epidemiology study

Journal of Exposure Science & Environmental Epidemiology volume 17, pages 314–320 (2007)Cite this article

Abstract

We recently reported associations between urinary 1-naphthol (1N) levels and several intermediate measures of male reproductive health, namely sperm motility, serum testosterone levels, and sperm DNA damage. However, because 1N is a major urinary metabolite of both naphthalene and the insecticide carbaryl, exposure misclassification stemming from differences in exposure source was probable and interpretation of the results was limited. As naphthalene, but not carbaryl, is also metabolized to 2-naphthol (2N), the relationship of urinary 1N to 2N within an individual may give information about source of 1N. Utilizing data from two previous studies that measured both 1N and 2N in urine of men exposed to either carbaryl or naphthalene, the present study employed several methods to differentiate urinary 1N arising from exposures to carbaryl and naphthalene among men in the reproductive health study. When re-evaluating the reproductive health data, techniques for identifying 1N source involved exploring interaction terms, stratifying the data set based on 1N/2N ratios, and performing an exposure calibration using a linear 1N to 2N relationship from a study of workers exposed to naphthalene in jet fuel. Despite some inconsistencies between the methods used to distinguish 1N source, we found that 1N from carbaryl exposure is likely responsible for the previously observed association between 1N and sperm motility, whereas 1N from naphthalene exposure is likely accountable for the association between 1N and sperm DNA damage. We demonstrate that studies of health effects associated with carbaryl should utilize a 1N/2N ratio to identify subgroups in which carbaryl is the primary source of 1N. Conversely, studies of naphthalene-related outcomes may utilize 2N levels to estimate exposure.

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Authors and Affiliations

  1. Department of Environmental Health Sciences, University of Michigan, Ann Arbor, Michigan, USA

    John D Meeker

  2. Centers for Disease Control and Prevention, Atlanta, Georgia, USA

    Dana B Barr

  3. Department of Environmental and Occupational Health, Florida International University, Miami, Florida, USA

    Berrin Serdar

  4. Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, USA

    Stephen M Rappaport

  5. Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts, USA

    Russ Hauser

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  1. John D Meeker
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  2. Dana B Barr
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  3. Berrin Serdar
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  4. Stephen M Rappaport
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  5. Russ Hauser
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Correspondence to John D Meeker.

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Meeker, J., Barr, D., Serdar, B. et al. Utility of urinary 1-naphthol and 2-naphthol levels to assess environmental carbaryl and naphthalene exposure in an epidemiology study. J Expo Sci Environ Epidemiol 17, 314–320 (2007). https://doi.org/10.1038/sj.jes.7500502

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