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Related Concept Videos

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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Endolysosomal dysfunction and exosome secretion: implications for neurodegenerative disorders.

André M Miranda1,2,3,4, Gilbert Di Paolo1,2,5

  • 1Department of Pathology and Cell Biology, Columbia University Medical Center, New York City, NY 10032, USA.

Cell Stress
|June 22, 2019
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Summary

Endolysosomal and autophagic defects are implicated in neurodegenerative diseases like Alzheimer's. Recent findings reveal damaged endomembranes and altered exosomes in neuronal dysfunction, impacting lipid signaling.

Keywords:
LBPAendomembrane damageextracellular vesiclesgalectinlysobisphosphatidic acidphosphatidylinositol-3-phosphatephosphoinositidephospholipidssphingolipids

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Area of Science:

  • Neurobiology
  • Cellular Biology
  • Biochemistry

Background:

  • Endolysosomal and autophagic defects are central to neurodegenerative diseases (Alzheimer's, Parkinson's, etc.).
  • Genetic studies link mutations in endolysosomal and autophagy genes to neurodegeneration.
  • Lysosomal dysfunction impairs clearance of toxic protein aggregates and affects lipid metabolism.

Purpose of the Study:

  • To summarize recent findings on neuronal endolysosomal and autophagic dysfunction.
  • To explore the role of damaged endomembranes and exosome release in neurodegeneration.
  • To discuss implications for lysosomal biology, lipid signaling, and neurodegenerative diseases.

Main Methods:

  • Investigated the role of class III phosphatidylinositol 3-kinase (PI3K) Vps34.
  • Analyzed neuronal endomembrane integrity.
  • Characterized exosome content, including Amyloid Precursor Protein COOH-terminal fragments (APP-CTFs) and bis(monoacylglycero)phosphate (BMP).

Main Results:

  • Neuronal dysfunction involves physically damaged endomembranes.
  • Exosomes are released, enriched with APP-CTFs and atypical phospholipid BMP.
  • These findings link endolysosomal/autophagic defects to specific cellular pathologies.

Conclusions:

  • Neuronal endolysosomal and autophagic dysfunction presents with damaged endomembranes and altered exosomes.
  • This dysfunction impacts lipid signaling and contributes to neurodegeneration.
  • Further research into these mechanisms is crucial for understanding and treating neurodegenerative disorders.