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Pyrethroid insecticides evoke neurotransmitter release from rabbit striatal slices

JT Eells and ML Dubocovich

Department of Pharmacology, Northwestern University Medical School, Chicago, Illinois.

The effects of the synthetic pyrethroid insecticide fenvalerate ([R,S]- alpha-cyano-3-phenoxybenzyl[R,S]-2-(4-chlorophenyl)-3- methylbutyrate) on neurotransmitter release in rabbit brain slices were investigated. Fenvalerate evoked a calcium-dependent release of [3H]dopamine and [3H]acetylcholine from rabbit striatal slices that was concentration- dependent and specific for the toxic stereoisomer of the insecticide. The release of [3H]dopamine and [3H]acetylcholine by fenvalerate was modulated by D2 dopamine receptor activation and antagonized completely by the sodium channel blocker, tetrodotoxin. These findings are consistent with an action of fenvalerate on the voltage-dependent sodium channels of the presynaptic membrane resulting in membrane depolarization, and the release of dopamine and acetylcholine by a calcium-dependent exocytotic process. In contrast to results obtained in striatal slices, fenvalerate did not elicit the release of [3H]norepinephrine or [3H]acetylcholine from rabbit hippocampal slices indicative of regional differences in sensitivity to type II pyrethroid actions.

Volume 246, Issue 2, pp. 514-521, 08/01/1988
Copyright © 1988 by American Society for Pharmacology and Experimental Therapeutics




This article has been cited by other articles:


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 J. Pharmacol. Exp. Ther.Home page
L. Imamura, H. Hasegawa, K. Kurashina, A. Hamanishi, A. Tabuchi, and M. Tsuda
Repression of Activity-Dependent c-fos and Brain-Derived Neurotrophic Factor mRNA Expression by Pyrethroid Insecticides Accompanying a Decrease in Ca2+ Influx into Neurons
J. Pharmacol. Exp. Ther., December 1, 2000; 295(3): 1175 - 1182.
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