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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.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...
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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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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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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Intralumenal Vesicles and Multivesicular Bodies01:38

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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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Clathrin Coated Vesicles01:12

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Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
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Related Experiment Video

Updated: Sep 28, 2025

Live Cell Imaging of Early Autophagy Events: Omegasomes and Beyond
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Organization of Presynaptic Autophagy-Related Processes.

Eckart D Gundelfinger1,2,3, Anna Karpova1,3, Rainer Pielot2,3

  • 1Research Group Neuroplasticity, Leibniz Institute for Neurobiology, Magdeburg, Germany.

Frontiers in Synaptic Neuroscience
|April 4, 2022
PubMed
Summary

Presynaptic protein quality control relies on autophagy and endolysosomal pathways. Key presynaptic structures like active zone scaffolds, endocytic machinery, and synaptic vesicles may serve as docking sites for these degradation systems.

Keywords:
Bassoonactive zone (AZ)amphisomeautophagyendocytic zoneendolysosomal systempresynaptic proteostasissynaptic vesicle (SV)

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Synapses require robust protein quality control due to distance from the soma, plasticity, and high energy demands.
  • Presynaptic terminals face unique challenges in clearing damaged proteins essential for neurotransmission and vesicle cycling.

Purpose of the Study:

  • To review the spatial organization of autophagy and endolysosomal pathways within the presynapse.
  • To identify presynaptic components involved in membrane-associated protein degradation.

Main Methods:

  • Literature review focusing on autophagy and endolysosomal systems in presynaptic terminals.
  • Inventory of degradative system components found in presynaptic boutons.
  • Identification of presynaptic structures interacting with protein degradation pathways.

Main Results:

  • Components of autophagy and endolysosomal systems are present in presynaptic boutons.
  • Three key presynaptic structures interact with protein degradation pathways: cytomatrix scaffolding proteins (e.g., Bassoon), the peri-active zone endocytic machinery, and synaptic vesicles.
  • These structures may act as docking stations for protein turnover.

Conclusions:

  • Autophagy and endolysosomal pathways are spatially organized within the presynapse.
  • Presynaptic protein turnover involves specific cellular mechanisms and cargo recruitment.
  • Understanding these pathways is crucial for synaptic function and health.