Biomarkers of sensitivity and exposure in Washington state pesticide handlers.
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.
Hofmann
Jonathan N
JN
Division of Cancer Epidemilogy and Genetics, National Cancer Institute, Bethesda, MD, USA. hofmannjn@mail.nih.gov
Keifer
Matthew C
MC
Checkoway
Harvey
H
De Roos
Anneclaire J
AJ
Farin
Federico M
FM
Fenske
Richard A
RA
Richter
Rebecca J
RJ
van Belle
Gerald
G
Furlong
Clement E
CE
D000110:Acetylcholinesterase / Q000378:metabolism*; D043303:Aryldialkylphosphatase / Q000378:metabolism; D015415:Biomarkers / Q000378:metabolism*; D002219:Carbamates / Q000737:chemistry; D006801:Humans; D016273:Occupational Exposure; D009943:Organophosphorus Compounds / Q000009:adverse effects; D010573:Pesticide Residues / Q000009:adverse effects; D010575:Pesticides / Q000009:adverse effects*; D015203:Reproducibility of Results; D012306:Risk; D014861:Washington
D015415:Biomarkers; D002219:Carbamates; D009943:Organophosphorus Compounds; D010573:Pesticide Residues; D010575:Pesticides; C020401:N-methylcarbamate; D000110:Acetylcholinesterase; D043303:Aryldialkylphosphatase