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首页> 外文期刊>The European Journal of Neuroscience >Regulation of the glutamate transporter EAAC1 by expression and activation of delta-opioid receptor.
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Regulation of the glutamate transporter EAAC1 by expression and activation of delta-opioid receptor.

机译:通过表达和激活δ阿片受体调节谷氨酸转运蛋白EAAC1。

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摘要

Glutamate transporters play an essential role in regulating temporal and spatial glutamate concentration in the synaptic cleft. The excitatory amino acid carrier 1 (EAAC1) is a neuronal-specific transporter. Opioid receptors are found to modulate the glutamatergic system in brain, but the regulatory mechanism remains to be investigated. Here we report that the delta-opioid receptor (DOR) co-expressed with EAAC1 in Xenopus oocytes, but not the micro-opioid receptor, down-regulates EAAC1 function, and that [d-Pen(2,5)]-enkephalin stimulation of DOR can counteract the down-regulation of the EAAC1-mediated uptake. Results from co-immunoprecipitation and immunofluorescence microscopy in both oocytes and rat hippocampal neurons indicate co-localization and suggest direct interaction between DOR and EAAC1. The results suggest that DOR can reduce EAAC1 function by direct protein-protein interaction and that activation of DOR releases the inhibitory interaction. We suggest that this mechanism may be important for modulation of the glutamatergic system following opioid stimulation.
机译:谷氨酸转运蛋白在调节突触间隙中的时间和空间谷氨酸浓度中起重要作用。兴奋性氨基酸载体1(EAAC1)是神经元特异性转运蛋白。发现阿片样物质受体可调节脑中的谷氨酸能系统,但其调节机制尚待研究。在这里,我们报道在非洲爪蟾卵母细胞中,δ-阿片受体(DOR)与EAAC1共表达,但微阿片受体不表达,下调EAAC1功能,并且[d-Pen(2,5)]-脑啡肽刺激DOR可以抵消EAAC1介导的摄取下调。卵母细胞和大鼠海马神经元中的共免疫沉淀和免疫荧光显微镜检查结果表明共定位,并表明DOR和EAAC1之间存在直接相互作用。结果表明,DOR可以通过直接的蛋白质-蛋白质相互作用降低EAAC1的功能,并且DOR的激活释放了抑制性相互作用。我们建议该机制可能对阿片样物质刺激后的谷氨酸能系统的调节很重要。

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