相关实验视频
Updated: Jun 16, 2026

08:44
Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models
Published on: November 11, 2014
Hsp70稳定了溶酶体,并逆转了与尼曼-皮克病相关的溶酶体病理
Thomas Kirkegaard1, Anke G Roth, Nikolaj H T Petersen
1Apoptosis Department and Centre for Genotoxic Stress Research, Institute of Cancer Biology, Danish Cancer Society, DK-2100 Copenhagen, Denmark.
Nature
|January 30, 2010
概括
热冲击蛋白70 (Hsp70) 通过与双单糖酸 (BMP) 结合来稳定溶解体,从而增强酸胺基酶 (ASM) 的活性. 这一发现为溶酶体储存障碍和癌症提供了潜在的新疗法.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 热冲击蛋白70 (Hsp70) 是细胞在压力下生存的关键分子伴侣.
- Hsp70的转移到溶解体表明它在溶解体功能和应激反应中的作用.
- 溶酶体膜透是压力诱导的细胞死亡的一个关键事件.
研究的目的:
- 阐明Hsp70稳定 lysosomes的分子机制.
- 为了研究Hsp70和 lysosomal组件之间的相互作用.
- 探索溶酶体储存障碍和癌症的治疗潜力.
主要方法:
- 在酸性环境中研究了Hsp70与酸 (BMP) 的结合.
- 使用BMP抗体和Hsp70点突变 (Trp90Phe) 来抑制Hsp70-BMP相互作用.
- 评估了抑制Hsp70-BMP相互作用和酸美林酶 (ASM) 对 lysosomal 稳定性的影响.
- 研究了Hsp70对降低ASM活性的尼曼-皮克病 (NPD) 细胞的影响.
主要成果:
- 在酸性条件下,Hsp70特别与BMP结合,促进BMP结合和ASM的活性.
- 抑制Hsp70-BMP相互作用或ASM活性逆转了Hsp70介导的溶酶体稳定.
- 来自尼曼-皮克病患者的细胞显示,由于ASM活性降低,溶酶体稳定性下降.
- 重组Hsp70治疗纠正了尼曼-皮克病细胞中的溶酶体不稳定性.
结论:
- Hsp70通过与BMP的直接相互作用稳定了溶解体,支持ASM功能.
- 像NPD这样的溶酶体储存障碍中的功能障碍ASM导致溶酶体不稳定.
- Hsp70代表了对溶酶体储存障碍和癌症的有希望的治疗标.
相关概念视频
Lysosomal Hydrolases
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,...
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...
Regulation of Nuclear Protein Sorting
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...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
Delivery Pathways to the Lysosome
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...
