由胆固醇积累引起的细胞衰老是由APOE4和AD中的 lysosomal ABCA1介导的
Shaowei Wang1, Boyang Li1, Zhiheng Cai1
1University of Southern California.
Research square
|May 27, 2024
概括
在阿尔茨海默病 (AD) 和APOE4模型中,胆固醇的积累通过将ATP结合盒载体A1 (ABCA1) 捕获在 lysosomes中,激活mTORC1通路,从而驱动细胞衰老. 降低胆固醇可以缓解这一过程,提供治疗见解.
科学领域:
- 神经科学是一个神经科学.
- 衰老研究研究 衰老研究
- 分子生物学分子生物学
背景情况:
- 细胞衰老是关键的衰老因素,并与阿尔茨海默氏症 (AD) 病原发生有关.
- 胆固醇积累是已知的细胞衰老的驱动因素,但机制仍然不清楚.
- 结合ATP的磁带载体A1 (ABCA1) 对于胆固醇平衡至关重要,其功能在AD和APOE4模型中受损.
研究的目的:
- 为了研究细胞衰老和AD中的ABCA1表达之间的关联.
- 阐明ABCA1贩运在APOE4和AD环境中胆固醇诱导的细胞衰老中的作用.
- 为了识别调解ABCA1贩运的分子标,以应对胆固醇积累.
主要方法:
- 对人类死后大脑样本的转录学,组织学和生物化学分析.
- 蛋白质组查以确定ABCA1贩运中介者.
- 利用APOE4-TR小鼠和诱导多能干细胞 (iPSC) 模型来研究胆固醇-ABCA1衰老通路.
主要成果:
- 阿尔茨海默病的大脑显示上调的衰老特征与增加的ABCA1表达,脂素和mTOR酸化相关.
- 卡维奥林-1是一种胆固醇传感器,促进了ABCA1溶酶体的捕获,在AD和APOE4模型中升高.
- 在APOE4-TR小鼠中,通过循环德克斯来降低胆固醇,降低了ABCA1溶酶体捕获,增强了HDL流量,并减少了mtorc1激活和神经炎症.
结论:
- 在APOE4和AD中胆固醇的积累会诱导caveolin-1,导致ABCA1溶酶体的捕获,mTORC1的激活和细胞衰老.
- 这项研究揭示了一种新的机制,它将胆固醇代谢,ABCA1贩运和老化与AD病原发生联系起来.
- 向胆固醇积累可能提供一种治疗策略,以减少老化和AD中的神经炎症.
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