目的 探测N-乙酰半胱氨酸(NAC)对于组成型和诱导型表达mGlu1a所介导的兴奋性毒性的影响。 方法 在过表达mGlu1a的HEK293细胞中,通过免疫印迹法,MTT法,胎盘蓝排斥法,酶联免疫吸附实验,二氯荧光素检测法及HPLC等方法,探测了NAC对mGlu1a下游信号分子活性,细胞活力和凋亡,受体表面表达以及细胞内氧化应激的影响。 结果 发现受体的组成型和诱导型活性通过不同机制,参与了NAC对于mGlu1a所介导的兴奋性毒性的抑制。在以上两种情况下,NAC均可以通过降低ROS调节细胞内氧化还原电势。 结论 在不同生理刺激条件下,mGlu1a的活性对于疾病的发生可能起着不同的作用,尤其是对mGlu1a高表达所产生的效应,为探究与mGluI相关疾病的发生提供了理论依据。
Objective To investigate the effects of N-acetylcysteine (NAC ) on constitutive (agonist-independent) and agonist-stimulated mGlu1a-mediated excitotoxicity associated with mGlu1a overexpression in HEK293 cells. Methods The signaling pathways, cell viability, the surface expression of mGlu1a and the intracellular oxidative stress were detected by western blot, MTT, trypan blue-exclusion assay,Elisa, Fluorescence-based Detection of Cellular ROS and HPLC methods. Results In mGlu1a-transfected cells and mGlu1a-transfected, DHPG-induced cells, NAC inhibited the excitotoxicity of mGlu1a by different mechanisms. Under two conditions, NAC prohibited the production of ROS and modulated the intracellular glutathione redox potential. Conclusion This study further suggested that the complex effects of mGlu1a activity under different conditions might play different role in the progress of many diseases, especially in terms of the effects of increased receptor expression.