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Understanding amphisomes.

Dhasarathan Ganesan1, Qian Cai1

  • 1Department of Cell Biology and Neuroscience, Division of Life Science, School of Arts and Sciences, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, U.S.A.

The Biochemical Journal
|May 28, 2021
PubMed
Summary
This summary is machine-generated.

Amphisomes, hybrid organelles formed by endosome-autophagosome fusion, are crucial for cellular waste removal and neuronal transport. This review details amphisome biogenesis, function, and roles in neurodegenerative diseases like Alzheimer's and Parkinson's.

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amphisomeautophagylate endosomeneurodegenerationneurotrophic signalingretrograde axonal transport

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Amphisomes are hybrid organelles formed by the fusion of endosomes and autophagosomes.
  • Their formation is a critical step in the autophagic pathway, preceding lysosomal degradation.
  • In neurons, amphisomes facilitate the transport of autophagosomes from axonal terminals to the soma.

Purpose of the Study:

  • To provide an updated overview of amphisome biogenesis and function.
  • To discuss the molecular and cellular mechanisms regulating amphisome formation and roles.
  • To explore the implications of amphisome dysregulation in neurodegenerative diseases, focusing on Alzheimer's and Parkinson's disease.

Main Methods:

  • Literature review of recent discoveries and advancements in amphisome research.
  • Analysis of molecular and cellular mechanisms involved in amphisome biogenesis.
  • Comparative discussion of amphisome roles in Alzheimer's and Parkinson's disease.

Main Results:

  • Amphisome formation involves complex protein machineries (SNAREs, Rabs, ESCRTs) regulating autophagic flux.
  • Amphisomes serve as a nexus between autophagy and the endo-lysosomal pathway.
  • Emerging evidence highlights amphisomes' roles in non-canonical functions like retrograde signaling and unconventional secretion.

Conclusions:

  • Amphisomes are key intermediates in cellular degradation and transport pathways.
  • Understanding amphisome regulation is crucial for deciphering their involvement in neurodegenerative conditions.
  • Further research into amphisomes may reveal novel therapeutic targets for Alzheimer's and Parkinson's disease.