在正常衰老和痴呆症中,在宁-血管酶系统内改变基因表达
Hannah M Tayler1, Robert MacLachlan1, Özge Güzel1
1Dementia Research Group, Clinical Neurosciences, Bristol Medical School, University of Bristol, Bristol, UK.
概括
大脑氨酸 - 血管新生素系统 (RAS) 的与年龄相关的不平衡可能引发阿尔茨海默氏病 (AD) 失调. 这项研究在正常衰老和痴呆症中发现了RAS基因表达的改变,这表明RAS和神经退行性疾病之间存在联系.
科学领域:
- 神经科学是一个神经科学.
- 遗传学 遗传学 是一个
- 衰老研究研究 衰老研究
背景情况:
- 氨酸-血管素系统 (RAS) 在心血管和大脑功能中起着至关重要的作用.
- 大脑RAS的失调与阿尔茨海默病 (AD) 的病理生理学有关.
- 大脑中与年龄相关的RAS变化可能会导致AD的发病.
研究的目的:
- 为了研究这样一个假设,即与年龄相关的大脑RAS不平衡会触发AD中的RAS失调.
- 在正常衰老和各种痴呆症亚型中描述RAS基因表达模式.
主要方法:
- 量化PCR (qPCR) 用于测量关键RAS组件 (ACE1,AGTR1,AGTR2,ACE2,LNPEP,MAS1) 的基因表达.
- 基因表达在正常衰老个体 (n=99) 的前皮层和痴呆症队列 (n=209) 中被分析,包括AD,混合痴呆症和血管痴呆症 (VaD).
- 数据根据参考基因和细胞特异性基因进行了调整,并根据AD和混合痴呆症队列的布拉克纠阶段 (BS) 分层.
主要成果:
- 在正常衰老中,ACE1,AGTR1和AGTR2基因表达升高,而保护性RAS信号标记物 (ACE2,MAS1,LNPEP) 保持不变.
- 在AD和混合痴呆症中,AGTR1和AGTR2的表达随着布拉克阶段的增加,而MAS1的表达在后期阶段下降,与粉样β和tau负载相反相关.
- 在纯血管性痴呆症 (VaD) 中,LNPEP基因表达特别升高.
结论:
- 大脑RAS与年龄相关的变化,特别是ACE1和AGTR1的增加,可能会导致AD发展.
- 在RAS基因表达中的特定变化,如降低MAS1和升高LNPEP,与不同的痴呆病理有关.
- 这些发现为RAS信号在正常衰老和神经退行性疾病的进展中的作用提供了新的见解.
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