摘要
转运蛋白(18 kDa)(TSPO)是一种线粒体蛋白,可将胞质胆固醇定位于线粒体膜上,从而开始合成包括神经营养性神经甾体在内的甾体。 TSPO大量存在于支持神经元并对神经炎症作出反应的神经胶质细胞中。 TSPO位于线粒体的外膜,调节线粒体通透性过渡孔(mPTP)的开口,该孔控制线粒体功能所需的分子的进入。 TSPO与神经退行性阿尔茨海默氏病(AD)相关,因此TSPO在AD患者的大脑中被上调并发出AD引起的大脑不良变化的信号。响应于脑损伤的TSPO的最初增加仍然升高,以修复细胞损伤,并可能随着AD的进行而防止进一步的神经元变性。为了发挥这种保护作用,TSPO增加了神经保护性类固醇的合成,减少了神经炎症,限制了mPTP的开放,并减少了活性氧的产生。 TSPO对AD脑的有益作用表现为神经毒性淀粉样β的减轻和线粒体功能障碍,并伴有记忆力和认知能力的改善。但是,随着AD严重程度的提高,TSPO的保护活性似乎是暂时的,并最终减弱。在失去内源性TSPO活性之前,及时用TSPO激动剂/配体治疗可能会增强保护功能,并可能延长神经元的存活时间。
关键词: 阿尔茨海默氏病(AD),β淀粉样蛋白,神经类固醇,线粒体通透性过渡孔,活性氧,转运蛋白(18 kDa)。
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