通过ATF5介导的线粒体展开蛋白质反应可以保护SH-SY5Y细胞的Pb诱导的线粒体损伤
Yihan Xu1, Min Liu2, Sikang Gao3
1Key Laboratory of Environment and Health, Ministry of Education & Ministry of Environmental Protection, and State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, China.
Neurotoxicology
|November 15, 2024
概括
线粒体未折叠蛋白反应 (mtUPR) 保护神经细胞免受毒性影响. 通过ATF5激活mtUPR可以保护线粒体,减少氧化应激和暴露引起的细胞死亡.
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
- 毒理学 毒理学 毒理学
背景情况:
- 线粒体是 (Pb) 神经毒性的关键目标,导致功能和形态受损.
- 线粒体展开蛋白质反应 (mtUPR) 是一种细胞应激反应,可以防止线粒体功能障碍,与衰老和神经退行相关.
研究的目的:
- 为了研究mtUPR激活是否能防止由引起的神经毒性.
- 阐明ATF5在介导mtUPR诱导的防暴露中的作用.
主要方法:
- 神经细胞暴露于亚致命酸 (PbAc).
- 对线粒体功能,形态和氧化酸化 (OXPHOS) 的分析.
- 对mtUPR标记物 (LonP1,ClpP,HSPA1A) 和ATF5.5的基因表达分析
- 对ATF5.5进行基因操纵 (淘汰赛和过度表达).
主要成果:
- 暴露于PbAc会诱导线粒体损伤,并通过增加LonP1,ClpP和HSPA1A的表达来激活mtUPR.
- ATF5调解了Pb诱导的mtUPR激活;ATF5缺乏加剧了Pb诱导的线粒体损伤,氧化应激和细胞死亡.
- 过度表达ATF5可以防止Pb诱导的氧化应激和细胞死亡.
结论:
- 由ATF5介导的mtUPR提供了对诱导的线粒体损伤和神经毒性的保护.
- 针对ATF5-介导的mtUPR通路提供了一种潜在的策略,以减轻神经毒性.
相关概念视频
The Unfolded Protein Response
4.4K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
4.4K
Translocation of Proteins into the Mitochondria
3.0K
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,...
3.0K
Mitochondrial Precursor Proteins
2.5K
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...
Most of the mitochondrial...
2.5K
Regulation of the Unfolded Protein Response
2.4K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.4K
Mitochondrial Protein Sorting
4.3K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.3K
Energy to Drive Translocation
2.0K
Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
Generally, polypeptides are unfolded by two distinct...
Generally, polypeptides are unfolded by two distinct...
2.0K


