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利鲁唑对AMPA受体通道的拮抗效应初探

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摘要 目的检测利鲁唑对α-氨基羟甲基恶唑丙酸型(α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid,AMPA)受体通道的作用方式,探讨利鲁唑治疗肌萎缩侧索硬化的分子药理学机制。方法在HEK293细胞上表达纯合型AMPA受体通道(GluR2L504Y),通过压电控制超快速脉冲式给药结合膜片钳技术,观察不同浓度的利鲁唑加饱和谷氨酸联合给药及背景给药(药物脉冲前进行利鲁唑预灌注)模式下对AMPA受体通道电流特征的影响。结果在背景给药模式下,采用0.1 mM或更高浓度利鲁唑预灌注后所得最大电流强度、曲线下面积均显著下降(P<0.001),符合竞争性受体拮抗机制改变。联合给药模式下,谷氨酸加1 mM利鲁唑或3 mM利鲁唑时电流衰减时间常数进行性减小(P=0.02),且在加3 mM利鲁唑脉冲结束后观察到尾电流增大现象,提示还具有附加的开通道拮抗作用。结论利鲁唑对AMPA受体存在直接拮抗效应,影响谷氨酸介导的兴奋性氨基酸损伤可能是其神经保护的基础之一。
出处 《中国神经精神疾病杂志》 CAS CSCD 北大核心 2009年第9期565-567,共3页 Chinese Journal of Nervous and Mental Diseases
基金 教育部留学回国人员科研启动基金资助项目(编号:JYB0801)
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