氨基酸β糖化诱导神经元线粒体功能障碍和阿尔茨海默病的发病因子通过VDAC1-依赖的mtDNA流量
Firoz Akhter1, Asma Akhter1, Xiongwei Zhu2
1Department of Biomedical Engineering, Stony Brook University, Stony Brook, NY 11794.
概括
糖胺β (gAβ) 通过促进线粒体DNA释放,触发了阿尔茨海默病 (AD) 中的先天免疫反应. 针对VDAC1,RAGE或cGAS-STING通路可能提供新的AD疗法.
科学领域:
- 神经科学是一个神经科学.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 糖化形成先进的糖化最终产品 (AGEs),涉及各种疾病.
- 在阿尔茨海默氏症 (AD) 中,粉样β (Aβ) 可以变成糖化β (gAβ),但其在病理学中的具体作用尚不清楚.
研究的目的:
- 调查糖胺β (gAβ) 在阿尔茨海默病 (AD) 中的病理作用.
- 阐明将gAβ与神经炎症和AD病原体联系起来的分子机制.
主要方法:
- 利用老年AD小鼠模型和人类AD脑样本.
- 通过VDAC1.1.研究了gAβ诱导的线粒体DNA (mtDNA) 流出.
- 研究了cGAS-STING天生的免疫通路的激活.
- 采用了基因淘汰 (RAGE,cGAS,STING) 和药理抑制 (VDAC1,ALT-711).
- 执行神经元特定的cGAS敲击和空间解析的转录组学.
主要成果:
- gAβ通过VDAC1促进神经元mtDNA流出,激活cGAS-STING通路.
- 在AD模型和患者的神经元细胞质中,有cGAS-mtDNA结合和cGAS-STING激活的证据.
- 抑制VDAC1,RAGE,cGAS或STING可以改善AD类病理和线粒体功能障碍.
- 神经元特异性cGAS敲击降低了神经炎症和认知缺陷.
- AGE交叉链断裂器ALT-711和RAGE抑制降低了gAβ相关的病理和天生的免疫激活.
结论:
- 建立了gAβ和AD的先天免疫激活之间的机制联系.
- 确定了VDAC1,AGE-RAGE轴和cGAS-STING通路作为AD病变发生的关键参与者.
- 这些成分代表了阿尔茨海默病的有希望的治疗点.
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