Abstract
Organophosphate (OP) and N-methyl-carbamate (CB) insecticides are widely used in agriculture in the US and abroad. These compounds – which inhibit acetylcholinestersase (AChE) enzyme activity – continue to be responsible for a high proportion of pesticide poisonings among US agricultural workers. It is possible that some individuals may be especially susceptible to health effects related to OP/CB exposure. The paraoxonase (PON1) enzyme metabolizes the highly toxic oxon forms of some OPs, and an individual’s PON1 status may be an important determinant of his or her sensitivity to these chemicals. This chapter discusses methods used to characterize the PON1 status of individuals and reviews previous epidemiologic studies that have evaluated PON1-related sensitivity to OPs in relation to various health endpoints. It also describes an ongoing longitudinal study among OP-exposed agricultural pesticide handlers who are participating in a recently implemented cholinesterase monitoring program in Washington State. This study will evaluate handlers’ PON1 status as a hypothesized determinant of butyrylcholinesterase (BuChE) inhibition. Such studies will be useful to determine how regulatory risk assessments might account for differences in PON1-related OP sensitivity when characterizing inter-individual variability in risk related to OP exposure. Recent work assessing newer and more sensitive biomarkers of OP exposure is also discussed briefly in this chapter.
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Acknowledgments
We would like to thank all of the workers who participated in this study. We also acknowledge the following individuals who contributed to this study: Zahra Afsharinejad for her work on the PON1 genotyping assays; Kelly Fryer-Edwards for her assistance with outreach to study participants; Pam Ernst and Joe Cozzetto from Central Washington Occupational Medicine for their assistance with our recruitment efforts; and Maria Negrete and Pablo Palmandez from the Pacific Northwest Agricultural Safety and Health Center for their assistance with field data collection. Financial support for this project was provided by CDC/NIOSH grants U50OH07544 and T42OH008433, and NIEHS grants P30ES07033, T32ES07262, P42ES04696, and ES009883.
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Hofmann, J.N. et al. (2010). Biomarkers of Sensitivity and Exposure in Washington State Pesticide Handlers. In: Reddy, S. (eds) Paraoxonases in Inflammation, Infection, and Toxicology. Advances in Experimental Medicine and Biology, vol 660. Humana Press. https://doi.org/10.1007/978-1-60761-350-3_3
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