ApoE4需要脂化增强,以解决NPC1抑制后的细胞脂和蛋白质异常
Erika Di Biase1, Kyle J Connolly1, Ingrid Crumpton1
1Neuroregeneration Institute, McLean Hospital, Harvard Medical School, Belmont, MA, 02478, USA.
Scientific reports
|April 29, 2025
概括
脂蛋白E (ApoE) 异型影响脂质积累和疾病风险. 向ApoE4脂化可能会恢复正常功能,并改善神经退行性疾病中的细胞存活率.
科学领域:
- 神经科学是一个神经科学.
- 细胞生物学 细胞生物学
- 脂质代谢 脂质代谢是什么
背景情况:
- 脂蛋白E (ApoE) 变体与阿尔茨海默氏症 (AD),莱维体痴呆症 (LBD) 和尼曼-皮克型C型疾病 (NPC) 有关.
- ApoE4变种显著增加了AD风险,但ApoE异形特异性细胞病原学的机制仍然不清楚.
- ApoE在脂质运输中的作用已经确立,但它对细胞脂质稳定和疾病的确切影响需要进一步阐明.
研究的目的:
- 研究不同Apolipoprotein E (ApoE) 异型蛋白对细胞脂质积累的影响.
- 确定ApoE异型如何影响脂质代谢和神经退行性疾病的发病.
- 探索针对ApoE脂化以恢复正常ApoE功能的治疗策略.
主要方法:
- 在人体纤维细胞和星球细胞中抑制内溶性胆固醇载体NPC1.
- 细胞内胆固醇和甘油三水平的量化.
- 对粉样蛋白前体蛋白 (APP),APP C端片段 (CTF) 和BACE1水平的分析.
- 评估细胞存活率和ApoE脂化.
主要成果:
- 抑制NPC1导致胆固醇积累增加4倍,改变胆固醇感应,增加胆固醇和甘油三的合成.
- 总APP,APP C端片段 (CTF) 和BACE1水平增加了三倍,与积累的中性脂质共定位.
- ApoE2和ApoE3降低了胆固醇水平,并使APP,BACE和CTF水平正常化,改善了细胞存活率,而ApoE4没有.
- 一种合成脂可以通过增加大型脂化ApoE4颗粒来恢复ApoE4的功能,从而纠正观察到的异常.
结论:
- 脂蛋白E (ApoE) 在细胞脂质病变发生过程中起着至关重要的作用,影响胆固醇平衡以及APP及其碎片的积累.
- ApoE异型对脂质代谢和细胞健康有不同的影响,ApoE4会加剧脂质积累和相关的病理.
- 准ApoE4脂化为恢复ApoE功能和减轻神经退行性疾病进展提供了一个有希望的治疗途径.
相关概念视频
Lipids as Anchors
5.4K
In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
5.4K
Receptor-mediated Endocytosis
103.4K
Overview
103.4K
Regulation of Nuclear Protein Sorting
2.3K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.3K
Phosphoinositides and PIPs
7.1K
Phosphoinositides are a group of phospholipids containing a glycerol backbone with two fatty acid chains and a phosphate attached to a myoinositol sugar ring. The inositol head group extends into the cytoplasm, where it is modified by adding phosphate groups to form phosphatidylinositol phosphates or PIPs.
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
Different phosphoinositides are synthesized and recruited on the cytosolic face of the plasma membrane. The localization of specific phosphoinositides concentrated in separate membrane...
7.1K
Asymmetric Lipid Bilayer
7.0K
Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
7.0K


