抗原特异性与年龄相关的记忆CD8 T细胞诱导和跟踪类似阿尔茨海默氏症的神经退行
Akanksha Panwar1, Altan Rentsendorj1, Michelle Jhun1
1Department Neurosurgery, Maxine Dunitz Neurosurgical Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048.
概括
之前与神经退行相关的CD8 T细胞被发现会启动类似阿尔茨海默氏症的变化,包括斑块和结沉积,前沿的粉样β和病理. 这些细胞还与人类阿尔茨海默病的进展有关.
科学领域:
- 神经免疫学 神经免疫学
- 神经退行发生神经退行.
- 阿尔茨海默病病理生理病理学
背景情况:
- 阿尔茨海默氏病 (AD) 的特点是粉样β (Aβ) 斑块和酸化 (pTau) ,但这些不足以引起完全的神经退行.
- 在阿尔茨海默病的发病过程中,Aβ/pTau的上游因素是未知的,这阻碍了早期诊断和治疗.
- 在阿尔茨海默病中,T细胞异常越来越多地被识别出来,CD8 T细胞可能会调解神经退行.
研究的目的:
- 为了调查抗原特异性记忆CD8T细胞 (称为hiT细胞) 是否影响散发性阿尔茨海默病 (AD) 类似的病理生理学Aβ和pTau沉积的上游.
- 阐明CD8 T细胞促进AD类病理的机制及其在人类AD患者中的相关性.
主要方法:
- 利用T型小鼠模型检查神经病理学,基因表达和行为.
- 研究了Perforin和干扰素- (IFNγ) 在T细胞介导的AD类病理生理学中的作用.
- 分析了人类阿兹海默症患者大脑和血液中的T细胞种群,并与认知衰退和血生物标志物 (pTau-217) 相关联的发现.
主要成果:
- 在T小鼠模型中,CD8 T细胞被证明可以诱导斑块和状沉积,调节AD相关的基因表达,并导致具有人类AD特征的渐进性神经退行.
- 珀福林对于启动病理生理学至关重要,而IFNγ对于大多数基因表达变化和疾病进展至关重要.
- 在人类AD大脑中,抗原特异性记忆CD8 T细胞升高,其周围血液水平与零星AD和认知衰退相关,表现优于血pTau-217.
结论:
- 确定了一个与年龄相关的因素,特别是CD8 T细胞,在Aβ/pTau上游起作用,启动零星的AD类病理生理学.
- 阐明了涉及Perforin和IFNγ在T细胞驱动的AD病变发生过程中的机制.
- 证明了人类AD中脑中CD8T细胞升高的临床相关性,以及它们作为疾病进展和认知衰退的生物标志物的潜力.
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