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Related Concept Videos

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Overview of Secretory Vesicles

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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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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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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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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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The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
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Exocytosis00:51

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Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy.
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Related Experiment Video

Updated: Dec 25, 2025

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Extracellular vesicles in the oligodendrocyte microenvironment.

Eva-Maria Krämer-Albers1

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Neuroscience Letters
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Summary

Oligodendrocyte-derived extracellular vesicles (EVs) mediate neural cell communication, influencing neuronal homeostasis, plasticity, and neurodegeneration. These EVs play key roles in the oligodendrocyte niche, impacting development, maintenance, and regeneration.

Keywords:
ExosomesExtracellular vesiclesMicroenvironmentMyelinationNeuron-glia interactionOligodendrocytesTissue homeostasis

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Extracellular vesicles (EVs) are crucial mediators of intercellular communication, modulating the tissue microenvironment.
  • Neural cells release EVs that influence neuronal homeostasis, plasticity, and neurodegenerative processes.
  • Oligodendrocytes and neurons form a specialized niche with critical interactions.

Purpose of the Study:

  • To discuss the multifaceted roles of oligodendrocyte-derived EVs.
  • To highlight their impact on neuronal signaling and the broader microenvironment.
  • To explore their functions in neural development, homeostasis, and regeneration.

Main Methods:

  • Literature review and synthesis of current research on oligodendrocyte-derived EVs.
  • Analysis of EV biogenesis, release, and uptake mechanisms.
  • Examination of EV cargo and functional consequences in the neural niche.

Main Results:

  • Oligodendrocyte EVs are internalized by neurons, exerting neuroprotective effects.
  • These EVs modulate neuronal plasticity and homeostasis.
  • They also influence other cells within the oligodendrocyte-neuron niche.

Conclusions:

  • Oligodendrocyte-derived EVs are key regulators within their niche.
  • They are involved in neural development, homeostasis, and regeneration.
  • Understanding these EVs is vital for addressing neurological disorders.