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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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Overview of Exosomes01:36

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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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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.
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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.
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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.
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COP Coated Vesicles00:59

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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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Updated: Apr 12, 2026

Isolation, Characterization, and Therapeutic Application of Extracellular Vesicles from Cultured Human Mesenchymal Stem Cells
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Matrix vesicles: Are they anchored exosomes?

Irving M Shapiro1, William J Landis2, Makarand V Risbud1

  • 1Department of Orthopedic Surgery, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA, USA.

Bone
|May 19, 2015
PubMed
Summary
This summary is machine-generated.

Matrix vesicles and exosomes are homologous extracellular microparticles involved in mineral formation. This finding impacts understanding of biogenesis and cell communication in vertebrate bone development.

Keywords:
ChondrocyteExosomeGrowth plateMatrix vesicleMineralizationOsteoblast

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Area of Science:

  • Biomineralization
  • Cell Biology
  • Extracellular Vesicles

Background:

  • Matrix vesicles are key sites for initial mineral formation in vertebrate tissues.
  • Similar extracellular particles, exosomes, are produced via the endosomal pathway.
  • Exosomes are known to mediate cell-cell communication.

Purpose of the Study:

  • To investigate the relationship between matrix vesicles and exosomes.
  • To understand the implications of this relationship for biogenesis and function.
  • To explore the role of these microparticles in regulating mineral deposition and bone development.

Main Methods:

  • Comparative analysis of size, morphology, lipid, and protein content of matrix vesicles and exosomes.
  • Literature review on extracellular vesicle biogenesis and function.

Main Results:

  • Matrix vesicles and exosomes share significant similarities in size, morphology, and molecular composition, suggesting homology.
  • This homology provides a framework for understanding matrix vesicle biogenesis and function.

Conclusions:

  • Matrix vesicles are likely homologous to exosomes, impacting our understanding of mineral deposition control.
  • These microparticles may facilitate intercellular signaling within the growth plate, regulating endochondral bone development.