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相关概念视频

Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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,...
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Glucose Transporters01:27

Glucose Transporters

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Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
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Electron Transport Chain: Complex I and II01:46

Electron Transport Chain: Complex I and II

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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...
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Insulin Secretory Vesicles01:05

Insulin Secretory Vesicles

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Insulin secretory vesicles release insulin to stimulate blood glucose uptake and regulate carbohydrate metabolism. When the blood glucose levels increase, glucose enters the pancreatic β-islet cells through glucose transporters. Once inside, glucose is metabolized through glycolysis, the citric acid cycle, and the electron transport chain, producing ATP. This increase in ATP concentration closes ATP-sensitive potassium channels, leading to depolarization of the membrane and the opening of...
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Chemiosmosis01:32

Chemiosmosis

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Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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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...
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Visualization of Endogenous Mitophagy Complexes In Situ in Human Pancreatic Beta Cells Utilizing Proximity Ligation Assay
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合成素 17 转位介导的髓转换驱动器高血糖引起的血管损伤

Anqi Luo1, Rui Wang2, Jingwen Gong3

  • 1School of Pharmacy, China Pharmaceutical University, Nanjing, 211198, China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 26, 2025
PubMed
概括

糖尿病心血管并发症因长期高葡萄糖而恶化,该过程将线粒细胞吸收从帕金介导路径转换为STX17介导路径,导致内皮损伤. 准这种线粒断开关提供了新的治疗策略.

关键词:
(糖尿病患者可能会患上糖尿病.财政财政财政财政财政财政合成素 17) 是一种线粒细胞衰变 (mitophagy) 是一种神经衰变的过程.血管内皮损伤 血管内皮损伤

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科学领域:

  • 心血管科学 心血管科学
  • 细胞生物学 细胞生物学
  • 代谢障碍 代谢障碍 代谢障碍

背景情况:

  • 糖尿病心血管并发症与高血糖持续时间相关.
  • 线粒与血管内皮损伤有关,但机制尚不清楚.
  • 了解线粒在高血糖引起的内皮功能障碍中的作用至关重要.

研究的目的:

  • 阐明持续高血糖期间内皮损伤中线粒细胞衰变的机制.
  • 研究帕金,Fis1和STX17在高葡萄糖诱导的线粒中的作用.
  • 确定糖尿病心血管并发症的潜在治疗点.

主要方法:

  • 使用糖尿病ApoE-/-小鼠和人类静脉内皮细胞 (HUVEC) 模型.
  • 在短期和长期高葡萄糖条件下分析了线粒细胞衰变通路 (帕金介导和STX17介导).
  • 研究了沉默或过度表达STX17和Fis1对内皮功能,ROS水平和eNOS酸化的影响.

主要成果:

  • 短期高葡萄糖增强了帕金介导的线粒和上调的Fis1.
  • 长期高葡萄糖抑制了帕金介导的线粒,降低了Fis1的调节,并激活了STX17介导的线粒.
  • 沉默STX17缓解了线粒体退化和内皮损伤,而Fis1沉默加剧了它.

结论:

  • 从帕金介导转变为STX17介导的线粒会导致长期高血糖症的血管内皮损伤.
  • 在高血糖压力下,STX17和Fis1在调节髓和内皮功能方面发挥着关键的,相反的作用.
  • 这些发现为开发针对糖尿病心血管并发症的治疗策略提供了洞察力.