Reduced effect of NMDA glutamate receptor antagonist on ethanol-induced ataxia and striatal glutamate levels in mice lacking ENT1.

Reduced effect of NMDA glutamate receptor antagonist on ethanol-induced ataxia and striatal glutamate levels in mice lacking ENT1.
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DOI:
10.1016/j.neulet.2010.05.079
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发表时间:
2010-08-02
影响因子:
2.5
通讯作者:
Choi DS
Choi DS
中科院分区:
医学4区
文献类型:
--
作者:
Nam HW;Lee MR;Hinton DJ;Choi DS

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已知酒精敏感的 1 型平衡核苷酸转运蛋白 (ENT1) 可以调节纹状体中的谷氨酸信号传导以及乙醇中毒。然而,目前尚不清楚 ENT1−/− 小鼠细胞外谷氨酸水平的改变是否会导致乙醇诱导的行为变化。在这里,我们报道了 ENT1−/− 小鼠中谷氨酸信号的改变与 NMDA 受体拮抗剂 CGP37849 乙醇诱导的运动和共济失调有关。与旋转棒上的 ENT1+/+ 同窝小鼠相比,用 CGP37849 和乙醇连续治疗后,ENT1−/− 小鼠的中毒程度似乎较低。这些结果表明,抑制 NMDA 谷氨酸受体对于调节酒精相关行为的反应和易感性至关重要。有趣的是,微透析实验表明,与背侧纹状体相比,ENT1−/− 小鼠的腹侧纹状体对 NMDA 受体拮抗剂的谷氨酸还原作用不太敏感。我们的研究结果表明纹状体中不同的谷氨酸神经传递调节乙醇中毒。
Alcohol-sensitive type 1 equilibrative nucleotide transporter (ENT1) is known to regulate glutamate signaling in the striatum as well as ethanol intoxication. However, it was unclear whether altered extracellular glutamate levels in ENT1−/− mice contribute to ethanol-induced behavioral changes. Here we report that altered glutamate signaling in ENT1−/− mice is implicated in the ethanol-induced locomotion and ataxia by NMDA receptor antagonist, CGP37849. ENT1−/− mice appear less intoxicated following sequential treatment with CGP37849 and ethanol, compared to ENT1+/+ littermates on the rotarod. These results indicate that inhibiting NMDA glutamate receptors is critical to regulate the response and susceptibility of alcohol related behaviors. Interestingly, a microdialysis experiment showed that the ventral striatum of ENT1−/− mice is less sensitive to the glutamate-reducing effect of the NMDA receptor antagonist compared to the dorsal striatum. Our findings suggest that differential glutamate neurotransmission in the striatum regulates ethanol intoxication.
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