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Related Concept Videos

Autophagy01:27

Autophagy

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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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Maturation of Endosomes01:28

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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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Delivery Pathways to the Lysosome01:36

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Eukaryotic cells use different mechanisms to eliminate toxic waste obsolete and worn-out substances. Lysosomes play a pivotal role in this, and hence, these substances are carried to the lysosome from other parts of the cell and extracellular space through different pathways. The most elaborately studied pathways to the lysosome are the endocytic pathways.
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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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Autophagic Cell Death01:18

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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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Related Experiment Video

Updated: Nov 2, 2025

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
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Maturing Autophagosomes are Transported Towards the Cell Periphery.

Anna Hilverling1, Eva M Szegö2, Elisabeth Dinter2

  • 1Department of Neurology, RWTH Aachen University, Aachen, Germany.

Cellular and Molecular Neurobiology
|June 9, 2021
PubMed
Summary

Autophagosome maturation involves pH changes and transport, crucial for clearing protein aggregates in neurodegenerative diseases like Parkinson's. Acidification precedes peripheral transport, with distinct movements of lysosomes and autolysosomes.

Keywords:
AmphisomesAutolysosomesAutophagyLysosomesMTOCTime-lapse microscopyα-Synuclein

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Molecular Biology

Background:

  • Autophagosome maturation, including lysosomal fusion and acidification, is vital for degrading protein aggregates in neurodegenerative diseases.
  • α-synuclein aggregates are hallmarks of Parkinson's disease and other synucleinopathies.

Purpose of the Study:

  • To investigate the intracellular trafficking of autophagosomes and α-synuclein aggregates during maturation.
  • To understand the role of luminal pH and lysosomal fusion in autophagosome transport and aggregate clearance.

Main Methods:

  • Utilized fluorescently tagged LC3 (autophagosome marker) and A53T mutant α-synuclein in HEK293T cells and primary astrocytes.
  • Employed time-lapse microscopy to analyze subcellular distribution and movement of vesicles.
  • Assessed lysosomal fusion using LAMP1 and discriminated vesicle pH using RFP-GFP tandem-fluorescence.

Main Results:

  • Neutral autophagosomes were found centrally, while acidic autophagosomes were peripheral, with acidification preceding peripheral transport.
  • Lysosomes moved centrally, and autolysosomes peripherally, suggesting spatial segregation of processes.
  • Acidification occurred independently of lysosomal fusion in some cases, and LAMP1-positive vesicles showed delayed acidification.

Conclusions:

  • Autophagosome and autolysosome transport is directed towards the cell periphery during maturation and aggregate clearance.
  • Luminal pH influences autophagosome transport direction, with acidic vesicles moving peripherally.
  • Distinct cellular regions facilitate specific steps of aggregate clearance, with synuclein aggregates potentially transported to the MTOC for autophagy.