首页> 外文期刊>Archives of Toxicology >Evaluation of the effects and mechanisms of action of glufosinate, an organophosphate insecticide, on striatal dopamine release by using in vivo microdialysis in freely moving rats
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Evaluation of the effects and mechanisms of action of glufosinate, an organophosphate insecticide, on striatal dopamine release by using in vivo microdialysis in freely moving rats

机译:通过自由移动大鼠体内微透析评估有机磷杀虫剂草铵膦对纹状体多巴胺释放的作用和作用机理

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The purpose of the present work was to assess the effects of glufosinate ammonium (GLA), an aminoacid structurally related to glutamate, on in vivo dopamine (DA) release from rat striatum, using brain microdialysis coupled to HPLC-EC. Intrastriatal administration of GLA produced significant concentration-dependent increases in DA levels. At least two mechanisms can be proposed to explain these increases: GLA could be inducing DA release from synaptic vesicles or producing an inhibition of DA transporter (DAT). Thus, we investigated the effects of GLA under Ca++-free condition, and after pretreatment with reserpine and TTX. It was observed that the pretreatment with Ca++-free Ringer, reserpine or TTX significantly reduced the DA release induced by GLA. Coinfusion of GLA and nomifensine shows that the GLA-induced DA release did not involve the DAT. These results show that GLA-induced striatal DA release is probably mediated by an exocytotic-, Ca++-, action potential-dependent mechanism, being independent of DAT.
机译:本研究的目的是使用脑微透析与HPLC-EC结合,评估草铵膦铵盐(GLA)(一种与谷氨酸结构相关的氨基酸)对大鼠纹状体体内多巴胺(DA)释放的影响。纹状体内给予GLA可使DA水平显着升高,且浓度依赖性。可以提出至少两种机制来解释这些增加:GLA可能诱导DA从突触小泡中释放或产生DA转运蛋白(DAT)的抑制作用。因此,我们研究了在无Ca ++ 条件下以及利血平和TTX预处理后GLA的作用。观察到用无Ca ++ 的林格,利血平或TTX预处理可显着降低GLA诱导的DA释放。 GLA和诺米芬丝碱的共注入显示,GLA诱导的DA释放不涉及DAT。这些结果表明,GLA诱导的纹状体DA释放可能是由胞外Ca-,Ca ++ -,动作电位依赖性机制介导的,与DAT无关。

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