Interaction between organophosphate pesticide exposure and PON1 activity on thyroid function
- Escuela Andaluza de Salud Publica, Granada (Spain)
- Instituto Nacional de Salud Publica, Cuernavaca, Morelos (Mexico)
- Instituto Nacional de Cardiologia 'Ignacio Chavez', Mexico D.F. (Mexico)
- Universidad Autonoma de Coahuila, Torreon, Coahuila (Mexico)
- Centro de Investigacion y Estudios Avanzados (CINVESTAV), Instituto Politecnico Nacional, Mexico D.F. (Mexico)
Organophosphate pesticides are widely used in agricultural purposes. Recently, a few studies have demonstrated the ability of these chemicals to alter the function of the thyroid gland in human. Moreover, the paraoxonase-1 enzyme (PON1) plays an important role in the toxicity of some organophosphate pesticides, with low PON1 activity being associated with higher pesticide sensitivity. This study evaluates the interaction between exposure to organophosphate compounds and PON1 enzyme activity on serum levels of TSH and thyroid hormones in a population of workers occupationally exposed to pesticides. A longitudinal study was conducted on a population of floriculture workers from Mexico, during two periods of high and low-intensity levels of pesticide application. A structured questionnaire was completed by workers containing questions on sociodemographic characteristics and other variables of interest. Urine and blood samples were taken, and biomarkers of exposure (dialkylphosphates), susceptibility (PON1 polymorphisms and activity) and effect (thyroid hormone levels) were determined. Interaction between dialkylphosphates and PON1 polymorphisms or PON1 activity on hormone levels was evaluated by generalized estimating equation (GEE) models. A significant interaction was found between serum diazoxonase activity and total dialkylphosphates ({Sigma}DAP) on TSH levels. Thus, when PON1 activity was increased we observed a decrease in the percentage of variation of TSH level for each increment in one logarithmic unit of the {Sigma}DAP levels. This interaction was also observed with the PON1{sub 192}RR genotype. These results suggest a stronger association between organophosphate pesticides and thyroid function in individuals with lower PON1 activity.
- OSTI ID:
- 21460235
- Journal Information:
- Toxicology and Applied Pharmacology, Vol. 249, Issue 1; Other Information: DOI: 10.1016/j.taap.2010.07.024; PII: S0041-008X(10)00270-X; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0041-008X
- Country of Publication:
- United States
- Language:
- English
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