Nervous System and Gastrointestinal Effects of the Insecticide Esfenvalerate on the Rat:An Ex Vivo Study

作     者：Petra Varró Eszter Szabó Melinda Kovács Ildikó Világi 

作者机构：Department of Physiology and NeurobiologyEotvos Loránd UniversityBudapestHungary MTA-KE Mycotoxins in the Food Chain Research GroupKaposvárHungary 

出 版 物：《Agricultural Sciences》 (农业科学（英文）)

年 卷 期：2014年第5卷第4期

页      面：365-375页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

主　　题：Pyrethroid Ileum Motility Brain Slice Field Potentials 

摘      要：Esfenvalerate belongs to the pyrethroid group of insecticides which display significant selective toxicity against insects compared to mammalian species, nevertheless, they may pose health risks, especially in case of accidental exposure. The aim of the present study was to model the effect of acute, relatively high-dose exposure of the esfenvalerate-containing formulation Sumi-Alpha?. Eventual functional alterations in the central nervous system and in the gastrointestinal tract were studied on in vitro tissue preparations at different delays after intragastric administration to rats. Neuronal effects were characterized by field potential recording in cortical and hippocampal brain slices, while gastrointestinal effects were examined by analyzing the motility and excitability of isolated ileum segments. On the brain slices originating from esfenvalerate-treated animals, changes in excitability of both inhibitory and excitatory type could be observed. Voltage thresholds necessary to evoke responses in neocortex slices were elevated, and population spike amplitudes were lower in hippocampal slices. However, epileptiform potentials with pronounced late components were also observed. A decreased long-term potentiation (LTP) could be seen in both brain areas after esfenvalerate treatment. Seizure susceptibility of the slices was not significantly altered, but tended to be somewhat higher in slices originating from treated rats. In ileum segments, both spontaneous and acetyl-choline (ACh)-elicited contractions were modified by treatment. Esfenvalerate raised the amplitude of contractions in the low ACh concentration range. However, the solvent xylene also considerably contributed to the detected changes. We can conclude that a relatively high, single oral dose of Sumi-Alpha? exerted mild and temporary effects on the elementary brain functions and intestine functions of the rat.