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Abstract:

BACKGROUND: Pyrethroids are neurotoxic insecticides used in a variety of indoor and outdoor applications. Previous research characterized the acute dose-effect functions for 11 pyrethroids administered orally in corn oil (1 mL/kg) based on assessment of motor activity. OBJECTIVES: We used a mixture of these 11 pyrethroids and the same testing paradigm used in single-compound assays to test the hypothesis that cumulative neurotoxic effects of pyrethroid mixtures can be predicted using the default dose-addition theory. METHODS: Mixing ratios of the 11 pyrethroids in the tested mixture were based on the ED30 (effective dose that produces a 30% decrease in response) of the individual chemical (i.e., the mixture comprised equipotent amounts of each pyrethroid). The highest concentration of each individual chemical in the mixture was less than the threshold for inducing behavioral effects. Adult male rats received acute oral exposure to corn oil (control) or dilutions of the stock mixture solution. The mixture of 11 pyrethroids was administered either simultaneously (2 hr before testing) or after a sequence based on times of peak effect for the individual chemicals (4, 2, and 1 hr before testing). A threshold additivity model was fit to the single-chemical data to predict the theoretical dose-effect relationship for the mixture under the assumption of dose additivity. RESULTS: When subthreshold doses of individual chemicals were combined in the mixtures, we found significant dose-related decreases in motor activity. Further, we found no departure from the predicted dose-additive curve regardless of the mixture dosing protocol used. CONCLUSION: In this article we present the first in vivo evidence on pyrethroid cumulative effects supporting the default assumption of dose addition.

Registro:

Documento: Artículo
Título:Evidence for dose-additive effects of pyrethroids on motor activity in rats
Autor:Wolansky, M.J.; Gennings, C.; DeVito, M.J.; Crofton, K.M.
Filiación:Departamento de Química Biológica (Área Toxicología), Facultad de Ciencias Exactas Y Naturales, Ciudad Universitaria, Buenos Aires, Argentina
Solveritas, LLC, Richmond, VA, United States
Division of Experimental Toxicology, National Health and Environmental Effects Research Laboratory, Office of Research and Development, Research Triangle Park, NC, United States
Division of Neurotoxicology, National Health and Environmental Effects Research Laboratory, Office of Research and Development, Research Triangle Park, NC, United States
Palabras clave:Additivity; Cumulative; Mixtures; Neurotoxicity; Pyrethroids; bifenthrin; bioallethrin; cipermethrin; cyfluthrin; cyhalothrin; deltamethrin; fenpropathrin; fenvalerate; permethrin; pyrethroid; resmethrin; animal experiment; animal model; article; controlled study; in vivo study; male; maximum allowable concentration; motor activity; motor dysfunction; neurotoxicity; nonhuman; prediction; priority journal; rat; Animals; Dose-Response Relationship, Drug; Insecticides; Male; Motor Activity; Pyrethrins; Rats; Rats, Long-Evans; Rattus; Zea mays
Año:2009
Volumen:117
Número:10
Página de inicio:1563
Página de fin:1570
DOI: http://dx.doi.org/10.1289/ehp.0900667
Título revista:Environmental Health Perspectives
Título revista abreviado:Environ. Health Perspect.
ISSN:00916765
CAS:bifenthrin, 82657-04-3; cipermethrin, 52315-07-8; cyfluthrin, 68359-37-5; cyhalothrin, 68085-85-8; deltamethrin, 52918-63-5; fenpropathrin, 39515-41-8; fenvalerate, 51630-58-1; permethrin, 51877-74-8, 52645-53-1; resmethrin, 10453-86-8; Insecticides; Pyrethrins
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00916765_v117_n10_p1563_Wolansky

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Citas:

---------- APA ----------
Wolansky, M.J., Gennings, C., DeVito, M.J. & Crofton, K.M. (2009) . Evidence for dose-additive effects of pyrethroids on motor activity in rats. Environmental Health Perspectives, 117(10), 1563-1570.
http://dx.doi.org/10.1289/ehp.0900667
---------- CHICAGO ----------
Wolansky, M.J., Gennings, C., DeVito, M.J., Crofton, K.M. "Evidence for dose-additive effects of pyrethroids on motor activity in rats" . Environmental Health Perspectives 117, no. 10 (2009) : 1563-1570.
http://dx.doi.org/10.1289/ehp.0900667
---------- MLA ----------
Wolansky, M.J., Gennings, C., DeVito, M.J., Crofton, K.M. "Evidence for dose-additive effects of pyrethroids on motor activity in rats" . Environmental Health Perspectives, vol. 117, no. 10, 2009, pp. 1563-1570.
http://dx.doi.org/10.1289/ehp.0900667
---------- VANCOUVER ----------
Wolansky, M.J., Gennings, C., DeVito, M.J., Crofton, K.M. Evidence for dose-additive effects of pyrethroids on motor activity in rats. Environ. Health Perspect. 2009;117(10):1563-1570.
http://dx.doi.org/10.1289/ehp.0900667