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Autophagy01:27

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Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
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Christian de Duve discovered “autophagy,” a process in which cellular components are engulfed by membrane-bound organelles called autophagosomes. The autophagosomes then fuse with lysosomes to digest the enclosed contents. Autophagy is generally activated in cells to prevent cell death. However, cell death is triggered when the damage is beyond repair.
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The early endosome containing internalized molecules matures through transformations in its location, morphology, intraluminal pH, and membrane protein composition. Together, these changes result in a more acidic late endosome that contains multiple intraluminal vesicles; therefore, the late endosome is also called a multivesicular body (MVB).
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Live Cell Imaging of Early Autophagy Events: Omegasomes and Beyond
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Autophagosome Biogenesis.

Yan Zhen1,2, Harald Stenmark1,2

  • 1Centre for Cancer Cell Reprogramming, Faculty of Medicine, University of Oslo, Montebello, N-0379 Oslo, Norway.

Cells
|February 25, 2023
PubMed
Summary
This summary is machine-generated.

Autophagy is a cellular process for clearing harmful substances. This review highlights ATG9 vesicles in initiating autophagosome formation and ESCRT proteins in sealing them.

Keywords:
ESCRTautophagosomeautophagyendosomelipid transportlysosome

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy maintains cellular homeostasis by degrading cytoplasmic components.
  • The process involves forming an autophagosome, which fuses with a lysosome for degradation.

Purpose of the Study:

  • To review recent advancements in understanding autophagosome biogenesis.
  • To highlight the role of ATG9 vesicles in phagophore initiation.
  • To discuss the function of ESCRT proteins in autophagosome sealing.

Main Methods:

  • Literature review of recent research on autophagy.
  • Analysis of proposed mechanisms for autophagosome membrane sourcing.
  • Discussion of the roles of specific proteins (ATG9, ESCRT) in the process.

Main Results:

  • Multiple membrane sources contribute to autophagosome formation.
  • ATG9-containing vesicles are proposed as key initiators of phagophore biogenesis.
  • ESCRT proteins are crucial for the final closure of the autophagosome.

Conclusions:

  • Autophagosome formation is a complex process involving diverse membrane sources.
  • ATG9 and ESCRT proteins represent critical regulatory points in autophagy.
  • Further research into these components will elucidate cellular quality control mechanisms.