相关实验视频
Updated: Jul 2, 2026

05:48
Rapid Generation of Amyloid from Native Proteins In vitro
Published on: December 5, 2013
粉样原蛋白和非粉样原蛋白的粉样原蛋白前体蛋白加工的粉样原蛋白和非粉样原蛋白的粉样原蛋白加工的粉样原蛋白和非粉样原蛋白的粉样原蛋白的粉样原蛋白加工的粉样原蛋白的粉样原蛋白
Misaki Hida1, Ken Yasuda2, Masaru Toyokawa1
1Human Health Sciences, Kyoto University Graduate School of Medicine, Japan.
Brain research
|March 28, 2025
概括
氧基细胞 (OLs) 产生与阿尔茨海默病 (AD) 相关的有毒粉样β (Aβ),但也分泌神经保护因子. 了解这种双重作用对于开发新的AD疗法至关重要.
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
- 阿尔茨海默氏症疾病研究研究
背景情况:
- 阿尔茨海默病 (AD) 涉及有毒的粉样β (Aβ) 积累和神经退行.
- 质细胞,包括寡头细胞系 (OLs),影响大脑恒温和AD病理.
- 寡干细胞前体细胞 (OPC) 和寡干细胞 (OLG) 在阿尔茨海默病中的特定作用尚未完全理解.
研究的目的:
- 为了研究Aβ生产和相关蛋白质表达在初级培养的OLs.
- 确定OLG的神经保护潜力和相关机制.
- 阐明OLs在AD病变发生过程中的双重作用.
主要方法:
- 大学生的初级文化.
- 对Aβ,粉样蛋白前体蛋白 (APP),BACE1,PS1,ADAM10和sAPPα表达的分析.
- 用g-分泌酶抑制剂和sAPPα抑制剂进行治疗.
- 在氧化应激下对OPC分化和神经元细胞活力的评估.
主要成果:
- 初级培养的OLs通过粉原性通路产生Aβ40和Aβ42.
- OLG表达APP变体,并通过非粉样原性通路分泌神经保护性sAPPα.
- 抑制γ-分泌酶减少了Aβ的产生,抑制了OPC的分化.
- 由OLG衍生的sAPPα保护神经元免受氧化应激.
结论:
- OLs在AD中表现出双重作用,产生致病性Aβ和神经保护性sAPPα.
- 在OL中amyloidogenic和non-amyloidogenic路径之间的平衡在AD中至关重要.
- 针对OLs病理过程的转变可能为AD提供新的治疗策略.
相关概念视频
Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Mitochondrial Precursor Proteins
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
Most of the mitochondrial precursors...
Translocation of Proteins into the Mitochondria
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Oligosaccharide Assembly
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
Export of Misfolded Proteins out of the ER
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...
Amyloid Fibrils
Amyloid fibrils are aggregates of misfolded proteins. Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils.
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid deposits were observed as early as 1639 in the liver and the spleen. In 1854, Rudolph Virchow performed iodine staining, normally used to...

