在瘤发生过程中,HRS通过定不稳定的蛋白质来维持线粒体平衡
Bo-Lin Xiao1, Jin-Bang Li1, Zhuo-Kun Chen1
1State Key Laboratory of Oral & Maxillofacial Reconstruction and Regeneration, Key Laboratory of Oral Biomedicine Ministry of Education, Hubei Key Laboratory of Stomatology, School & Hospital of Stomatology, Wuhan University, Wuhan, Hubei, 430079, China.
International journal of biological macromolecules
|October 7, 2025
概括
在黑色素瘤中,肝细胞生长因子调节的氨酸激酶基质 (HRS) 缺失通过损害线粒体功能和代谢适应来延缓瘤生长. 恢复线粒体蛋白质稳定可以挽救这些缺陷,这表明HRS是潜在的治疗点.
科学领域:
- 在瘤学瘤学.
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 运输 (ESCRT) 机器在癌症中的作用所需的内体细胞分类复合体是复杂的,并且取决于环境.
- 肝细胞生长因子调节的氨酸激酶基质 (HRS),ESCRT-0的组成部分,已经显示出瘤抑制和亲瘤作用,其对瘤启动和代谢的影响尚不清楚.
研究的目的:
- 调查HRS在黑色素瘤发病,生长和代谢适应中的作用.
- 阐明HRS影响瘤细胞代谢和线粒体功能的分子机制.
主要方法:
- 使用了一种转基因黑色素瘤模型,具有黑色素细胞特异性的HRS删除.
- 分析了瘤生长,细胞增殖,代谢概况 (糖解,TCA循环) 和线粒体功能.
- 研究了HRS缺乏对蛋白质贩运和线粒体蛋白质稳定的影响.
主要成果:
- 特定于黑色素细胞的HRS删除显著延迟了瘤发病,抑制了生长,并延长了生存时间.
- 缺乏HRS的细胞显示了代谢转向糖解和在能量压力下受损的增殖.
- HRS损失诱导了线粒体功能障碍,其特征是形态变化,TCA循环代谢物减少和呼吸酶活性受损.
- HRS缺乏导致线粒体中错误折叠的蛋白质的积累,引发了线粒体未折叠蛋白质反应 (mtUPR).
结论:
- HRS在维护线粒体蛋白质稳定和支持瘤代谢可塑性方面发挥着非正规的作用.
- 由于HRS损失破坏了错误折叠的蛋白质的内体清除,从而损害了线粒体功能.
- 向HRS可能提供一种策略,以破坏瘤在黑色素瘤中的代谢适应.
相关概念视频
Microtubule Instability
6.0K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
6.0K
Destabilization of Microtubules
3.5K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
3.5K
Electron Transport Chain: Complex I and II
18.4K
The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...
ROS generation is regulated and maintained at moderate levels necessary...
18.4K
Translocation of Proteins into the Mitochondria
12.2K
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,...
12.2K
mTOR Signaling and Cancer Progression
4.6K
The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The mTOR pathway or the...
4.6K
Energy to Drive Translocation
2.7K
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...
2.7K


