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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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Cellular Injury V: Apoptosis and Autophagy01:22

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Cells respond to damage and stress through highly coordinated processes that decide whether they survive or undergo controlled self-destruction. Two major pathways involved in this regulation are apoptosis, a type of programmed cell death, and autophagy, a survival mechanism that helps cells adapt to adverse conditions.ApoptosisApoptosis removes aged or injured cells to maintain tissue balance. During this process, the cell shrinks, chromatin condenses and fragments, and membrane-bound...
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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Related Experiment Video

Updated: May 2, 2026

In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice

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Alternative macroautophagy and mitophagy.

Shigeomi Shimizu1, Shinya Honda1, Satoko Arakawa1

  • 1Department of Pathological Cell Biology, Medical Research Institute, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8510, Japan.

The International Journal of Biochemistry & Cell Biology
|February 27, 2014
PubMed
Summary
This summary is machine-generated.

Mitophagy removes damaged mitochondria via macroautophagy, a process crucial for cell health. An Atg5-independent pathway specifically handles mitophagy in red blood cells.

Keywords:
Atg5-independent macroautophagyErythrocyte maturationMitophagyParkinSelective autophagy

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Physiology

Background:

  • Mitophagy is a vital mitochondrial quality control process.
  • It involves the removal of damaged or surplus mitochondria through macroautophagy.
  • This mechanism plays a role in physiological events like reticulocyte differentiation.

Purpose of the Study:

  • To elucidate the specific pathways involved in mitophagy.
  • To understand the role of different macroautophagy pathways in mitochondrial clearance.
  • To investigate the mechanism of mitophagy in erythrocytes.

Main Methods:

  • Investigated macroautophagy pathways.
  • Analyzed mitochondrial clearance mechanisms.
  • Focused on Atg5-dependent and Atg5-independent pathways.

Main Results:

  • Identified two distinct mammalian macroautophagy pathways.
  • Confirmed the Atg5-dependent conventional pathway.
  • Demonstrated the involvement of an Atg5-independent alternative pathway in erythrocyte mitophagy.

Conclusions:

  • Mitophagy is essential for maintaining mitochondrial health.
  • Mammalian cells utilize distinct macroautophagy pathways for mitophagy.
  • The Atg5-independent pathway is specifically implicated in erythrocyte mitophagy.