Journal Article

A Pharmacokinetic Model of <i>cis</i>- and <i>trans</i>-Permethrin Disposition in Rats and Humans With Aggregate Exposure Application

Rogelio Tornero-Velez, Jimena Davis, Edward J. Scollon, James M. Starr, R. Woodrow Setzer, Michael-Rock Goldsmith, Daniel T. Chang, Jianping Xue, Valerie Zartarian, Michael J. De Vito and Michael F. Hughes

in Toxicological Sciences

Volume 130, issue 1, pages 33-47
Published in print November 2012 | ISSN: 1096-6080
Published online August 2012 | e-ISSN: 1096-0929 | DOI:
A Pharmacokinetic Model of cis- and trans-Permethrin Disposition in Rats and Humans With Aggregate Exposure Application

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Permethrin is a broad-spectrum pyrethroid insecticide and among the most widely used insecticides in homes and crops. Managing the risks for pesticides such as permethrin depends on the ability to consider diverse exposure scenarios and their relative risks. Physiologically based pharmacokinetic models of delta methrin disposition were modified to describe permethrin kinetics in the rat and human. Unlike formulated deltamethrin which consists of a single stereoisomer, permethrin is formulated as a blend of cis- and trans-diastereomers. We assessed time courses for cis-permethrin and trans-permethrin in several tissues (brain, blood, liver, and fat) in the rat following oral administration of 1 and 10mg/kg permethrin (cis/trans: 40/60). Accurate simulation of permethrin in the rat suggests that a generic model structure is promising for modeling pyrethroids. Human in vitro data and appropriate anatomical information were used to develop a provisional model of permethrin disposition with structures for managing oral, dermal, and inhalation routes of exposure. The human permethrin model was used to evaluate dietary and residential exposures in the U.S. population as estimated by EPA’s Stochastic Human Exposure and Dose Simulation model. Simulated cis- and trans-DCCA, metabolites of permethrin, were consistent with measured values in the National Health and Nutrition Examination Survey, indicating that the model holds promise for assessing population exposures and quantifying dose metrics.

Keywords: pyrethroids; PBPK; aggregate exposure model

Journal Article.  9697 words.  Illustrated.

Subjects: Medical Toxicology ; Toxicology (Non-medical)

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