lysosomal 蛋白质学揭示了神经元 apoE4 相关的 lysosomal 功能障碍的机制
Einar K Krogsaeter1,2,3,4, Justin McKetney1,2,3,4, Leopoldo Valiente-Banuet5
1Gladstone Data Science and Biotechnology Institute, The J. David Gladstone Institutes, San Francisco, California, USA.
bioRxiv : the preprint server for biology
|October 24, 2023
概括
阿波利波蛋白E4 (ApoE4),阿尔茨海默氏症 (AD) 的风险因素,通过改变 lysosomal 蛋白质,损害 lysosomal 功能. 这项研究揭示了ApoE4导致神经元中的溶酶体化和蛋白质变化.
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
- 遗传学 是一个遗传学.
背景情况:
- Apolipoprotein E4 (ApoE4) 是阿尔茨海默氏症 (AD) 的一个主要遗传风险因素.
- 早期AD病原发生涉及神经元内解体系统,导致蛋白质聚合和细胞死亡.
- 溶解体在AD中至关重要,ApoE4定位到它们,但其对溶解体功能的影响尚不清楚.
研究的目的:
- 为了研究ApoE4对神经元中 lysosomal 功能的影响.
- 确定ApoE4影响 lysosomal活动的分子机制.
主要方法:
- 使用了表达ApoE4的神经细胞系.
- 评估了溶解体功能,包括pH值和蛋白质含量.
- 进行了定量溶酶体蛋白质组概况分析.
主要成果:
- ApoE4表达导致了 lysosomal 化和 lysosomal 功能受损.
- 蛋白质组分析揭示了 lysosomal 蛋白质的差异调节,与 AD 严重程度相关.
- 具体来说,ApoE4的表达导致了Lgals3bp的耗尽和Tmed5的积累在溶解体内.
结论:
- ApoE4通过重塑 lysosomal 蛋白质组来诱导广泛的 lysosomal 功能障碍.
- 溶酶体Tmed5积累和Lgals3bp枯竭是ApoE4诱导的溶酶体化的关键表现.
- 准这些蛋白质变化为AD提供了潜在的治疗策略.
相关概念视频
Lysosomal Hydrolases
3.8K
Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...
3.8K
Export of Misfolded Proteins out of the ER
3.6K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.6K
The Early Endosome: Endocytosis of Transferrin
3.3K
Essential proteins such as insulin or low-density lipoprotein (LDL) and micronutrients such as iron enter a eukaryotic cell through receptor-mediated endocytosis. Subsequently, the early endosomes fuse with the vesicles containing such receptor-ligand complexes and play a vital role in sorting the incoming ligands and receptors. While the ligands are either degraded inside the vesicle or released into the cytosol, their receptors are returned to the plasma membrane for further rounds of...
3.3K
Delivery Pathways to the Lysosome
6.6K
Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
6.6K


