摘要
衰老是一个不可避免的过程,其特征是逐渐丧失生理完整性,增加对癌症、糖尿病、心血管和神经退行性疾病的易感性;衰老是阿尔茨海默病(AD)的主要危险因素,阿尔茨海默病是痴呆的最常见原因。AD的特征是大脑病理学,包括淀粉样蛋白聚集的细胞外沉积和由过度磷酸化的tau蛋白组成的神经原纤维缠结的细胞内积聚。此外,突触和大量神经元的丢失是AD大脑的关键病理。越来越多的证据表明,衰老大脑中海马神经网络的激活不足,而AD相关的轻度认知障碍(AD-MCI)开始于过度激活,随后随着AD的发展,海马活动减弱。海马神经网络活性的双相趋势与N-甲基-D-天冬氨酸受体(NMDA-R)活性从衰老到前驱(AD-MCI)到中晚期AD的变化一致。D-丝氨酸是丝氨酸外消旋酶(SR)催化的外消旋化产物,突触发生、长期增强(LTP)、发育和兴奋毒性。衰老的大脑海马中SR和D-丝氨酸减少,与认知功能受损相关。相比之下,AD大脑中SR增加,这与更大程度的认知功能障碍有关。新的研究表明,AD患者大脑或脑脊液中的D-丝氨酸水平高于年龄匹配的对照组,但结果并不一致。最近,据报道,AD患者的血清D-丝氨酸水平与性别和临床痴呆分级(CDR)阶段相关。这篇综述将讨论衰老和AD大脑中NMDA-R和SR的变化,并探讨SR差异调节的机制。总之,我们认为SR可能是一种分子开关,可以区分衰老和AD对大脑的影响。
关键词: 海马、神经网络、轻度认知障碍、长期增强、神经传递、突触可塑性、ERK、CaMKIV。
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