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Intralumenal Vesicles and Multivesicular Bodies01:38

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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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Exosomes are stable, lipid bilayer-enclosed vesicles capable of crossing biological barriers. They can carry a wide range of molecules required for intercellular communication. Once exosomes are released from the cell where they originated, they enter a recipient cell through various pathways such as fusion, receptor-mediated endocytosis, macropinocytosis, and phagocytosis.
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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.
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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.
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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.
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Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
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Freeze-Fracture Electron Microscopy for Extracellular Vesicle Analysis
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SnapShot: Extracellular Vesicles.

Federico Cocozza1, Eleonora Grisard2, Lorena Martin-Jaular2

  • 1Institut Curie, INSERM U932, PSL Université, 26 rue d'Ulm, Paris 75005, France; Université de Paris, 85 Bd St germain, Paris 75006, France.

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Summary

Cells release extracellular vesicles (EVs) that carry cellular components and have diverse functions. Various methods exist to isolate these EVs, impacting their purity and abundance for research.

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Area of Science:

  • Cell biology
  • Biochemistry
  • Biotechnology

Background:

  • Cells continuously release extracellular vesicles (EVs) into their surroundings.
  • EVs encompass diverse subtypes like exosomes and microvesicles, originating from endosomes or the plasma membrane.
  • These vesicles transport cellular cargo and exhibit varied functional properties.

Purpose of the Study:

  • To provide an overview of extracellular vesicle (EV) release and characteristics.
  • To discuss the implications of different isolation techniques on EV preparations.

Main Methods:

  • Literature review on EV biogenesis and release.
  • Analysis of common EV isolation methodologies.
  • Comparison of purity and abundance across different EV separation techniques.

Main Results:

  • Extracellular vesicles (EVs) are released through distinct biogenic pathways.
  • EV cargo reflects their cell of origin, conferring specific functions.
  • Isolation techniques significantly influence the composition and yield of EV preparations.

Conclusions:

  • Understanding EV heterogeneity is crucial for functional studies.
  • The choice of EV isolation method directly impacts research outcomes.
  • Standardization of EV separation techniques is needed for reproducible results.