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相关概念视频

Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

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Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
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Overview of Secretory Vesicles01:33

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
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Receptor Downregulation in MVBs01:15

Receptor Downregulation in MVBs

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Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that  lead to cell proliferation, migration, and differentiation. Overexpression of EGFR  stimulates cells to proliferate. Excessive  EGFR...
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Vesicular Tubular Clusters01:45

Vesicular Tubular Clusters

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After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
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Intracellular Movement of Viruses and Bacteria01:10

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Intracellular bacteria and viruses often comprise a group of highly infectious pathogens that can cause several diseases. Bacterial pathogens include those belonging to the genus Rickettsia responsible for conditions such as rocky mountain spotted fever and the Mediterranean spotted fever; Chlamydia, a genus responsible for a sexually transmitted disease; Coxiella burnetii, an agent responsible for Q fever. Viral pathogens include vaccinia—a poxvirus, and herpes simplex virus—a...
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Fusion of Secretory Vesicles with the Plasma Membrane01:26

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Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
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相关实验视频

Updated: May 13, 2025

Size Exclusion Chromatography to Analyze Bacterial Outer Membrane Vesicle Heterogeneity
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格拉姆阴性细菌的外膜囊泡及其与病原发生的相关性.

Fatemeh Sadat Abolhasani1, Nasim Vaghefinanekaran2, Aref Yarahmadi3

  • 1Department of Pathobiology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

Frontiers in immunology
|April 16, 2025
PubMed
概括

格拉姆阴性细菌导致广泛的疾病. 外膜囊泡 (OMVs) 是关键的毒性因素,影响宿主免疫力和疾病,为新的抗菌战略提供了潜力.

关键词:
格拉姆阴性细菌是一种细菌.免疫系统 免疫系统外膜囊泡 (OMVs) 是一种病变的发生和发病.的分泌系统分泌系统.疫苗,疫苗的使用情况.

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科学领域:

  • 微生物学 微生物学
  • 免疫学 免疫学 免疫学
  • 病变的发生和发病.

背景情况:

  • 格拉姆阴性细菌是全球普遍存在的病原体,导致严重的死亡率.
  • 细菌病原发生涉及复杂的毒性因子,外膜囊泡 (OMV) 作为关键的,但尚未研究的贡献者.
  • OMVs是调节宿主免疫反应和疾病进展的细菌成分.

研究的目的:

  • 综合审查外膜囊泡 (OMVs) 在グラム阴性细菌病原发生中的作用.
  • 探索OMV和宿主细胞之间的相互作用.
  • 讨论了解OMV功能的潜在生物医学应用.

主要方法:

  • 对细菌外膜囊泡现有研究的文献综述.
  • 对OMV组成和生物发生的分析.
  • 检查OMV与宿主相互作用和免疫调节.

主要成果:

  • OMV是重要的毒性因素,有助于疾病的严重程度和炎症.
  • OMVs可以逃避宿主免疫反应,促进细菌的生存和感染.
  • OMV含有多样化的细菌分子,对宿主有机体有不同的影响.

结论:

  • 外膜囊泡在格拉姆阴性细菌的病原性中起着至关重要的作用.
  • 了解OMV生物发生和功能是开发新型治疗策略的关键.
  • 针对OMV可能为抗微生物干预和疾病治疗提供新的途径.