Alzheimer's Research & Therapy:衰老相关血源因子可能是临床前AD认知能力的生物标志物

2021-05-29 MedSci原创 MedSci原创

加速长期遗忘是症状前AD的一个认知特征。与衰老相关的血源因子,特别是THBS4、GDF11和CCL11,可能是预测长期加速遗忘的有前途的生物标志物。

在临床前阿尔茨海默病(AD)中已经发现了加速的长期遗忘,这归因于记忆巩固的选择性损伤,而海马体在其中起着关键作用。由于血液中可能包含多种与衰老相关的因素,这些因素参与了海马的神经发生和突触可塑性,Jianwei Yang等检测了来自常染色体显性AD (ADAD)家庭的无症状个体的血液中因素与加速长期遗忘之间是否存在关联。研究结果发表在Alzheimer's Research & Therapy杂志。

该研究分析了来自中国家族性阿尔茨海默病网络(CFAN)研究的39名无症状参与者(18名ADAD突变携带者,21名非携带者)的数据。长期遗忘率是根据回忆或识别两种材料(单词表和复杂图形)在三种延迟下计算的,包括立即、30分钟和7天。对所有参与者的外周血中候选的促衰老因子(CC趋化因子配体11 [CCL11]和单核细胞趋化蛋白1 [MCP1])和再生因子(生长分化因子11 [GDF11]、血栓反应蛋白4 [THBS4]和分泌的富含半胱氨酸的酸性蛋白1 [SPARCL1])的浓度进行了评估。

尽管在标准30分钟延迟测试中表现正常,但与匹配的非携带者相比,突变携带者在7天内表现出对口头和视觉材料的加速遗忘。在整个样本中,较低的血浆THBS4与列表回忆(β =−0.46,p = 0.002)、图回忆(β =−0.44,p = 0.004)和列表识别(β =−0.37,p = 0.010)中加速的长期遗忘有关。

ROC曲线用于鉴别临床前突变携带者和非携带者的长期遗忘率。ROC曲线显示了列表回忆(a)、图回忆(b)和列表识别(c)的长期遗忘率。

此外,高血浆GDF11和CCL11均与加速的长期遗忘相关(GDF11 vs图形回忆:β = 0.39, p = 0.007;CCL11与列表识别:β = 0.44, p = 0.002)。

对突变携带者的长期遗忘率估计接近的散点图

该研究为现有的将加速长期遗忘描述为ADAD突变携带者亚临床认知障碍的文献提供了更多的证据。此外,还发现,在突变携带者和非携带者的混合参与者中,与衰老相关的血源因素和加速长期遗忘之间存在关联。这项研究是首次试图确定无症状个体中血源性因素和加速长期遗忘之间的联系。该研究揭示了血源性因素作为预测加速长期遗忘的潜在生物标志物的前景。

总之,该研究表明,加速长期遗忘作为一种海马体依赖的记忆损伤,在AD的早期阶段出现与海马功能障碍相关的衰老相关血源因子,包括THBS4、GDF11和CCL11,可能是加速长期遗忘的理想生物标志物。研究结果强调了一个观点,即血源性因素可能对症状前AD的微妙认知能力下降提供见解,这值得在接下来的研究中进一步研究。

原文出处

Yang, J., Kong, C., Jia, L. et al. Association of accelerated long-term forgetting and senescence-related blood-borne factors in asymptomatic individuals from families with autosomal dominant Alzheimer’s disease. Alz Res Therapy 13, 107 (2021). https://doi.org/10.1186/s13195-021-00845-0

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