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Related Concept Videos

Autophagy01:27

Autophagy

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,...
Delivery Pathways to the Lysosome01:36

Delivery Pathways to the Lysosome

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.
Endocytosis
In endocytosis, the cell membrane takes up macromolecules and particles from the surrounding medium. Clathrin-mediated...
Autophagic Cell Death01:18

Autophagic Cell Death

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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Cellular Injury V: Apoptosis and Autophagy01:22

Cellular Injury V: Apoptosis and Autophagy

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...
Erythropoiesis01:14

Erythropoiesis

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In Vitro and In Vivo Detection of Mitophagy in Human Cells, C. Elegans, and Mice
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Selective mitochondrial autophagy during erythroid maturation.

Min Chen1, Hector Sandoval, Jin Wang

  • 1Department of Immunology, Baylor College of Medicine, Houston, Texas 77030, USA. minc@bcm.tmc.edu

Autophagy
|August 22, 2008
PubMed
Summary

Mitochondrial clearance during red blood cell maturation requires Nix protein. Loss of mitochondrial membrane potential (DeltaPsim) triggers selective autophagy, enabling mitochondrial removal in Nix-deficient cells.

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Published on: May 4, 2016

Area of Science:

  • Cell Biology
  • Autophagy Research
  • Erythropoiesis

Background:

  • Autophagy demonstrates selectivity in clearing cellular organelles in various cell types.
  • Nix protein plays a crucial role in the maturation of red blood cells (erythroid maturation).
  • Mitochondrial membrane potential (DeltaPsim) dissipation is a key event during erythroid maturation.

Purpose of the Study:

  • To investigate the role of Nix in selective mitochondrial autophagy during erythroid maturation.
  • To determine if mitochondrial depolarization influences the recognition and sequestration of mitochondria by autophagosomes.
  • To explore the implications of mitochondrial autophagy mechanisms for aging and neurodegenerative diseases.

Main Methods:

  • Observation of mitochondrial sequestration by autophagosomes in Nix-deficient reticulocytes.
  • Assessment of mitochondrial membrane potential (DeltaPsim) during erythroid maturation.
  • Utilizing pharmacological agents to induce loss of DeltaPsim and evaluate mitochondrial clearance.

Main Results:

  • Mitochondrial sequestration by autophagosomes is impaired in the absence of Nix.
  • Nix is essential for the dissipation of mitochondrial membrane potential (DeltaPsim) in maturing red blood cells.
  • Pharmacological induction of mitochondrial depolarization restores mitochondrial sequestration and clearance in Nix(-/-) cells.

Conclusions:

  • Mitochondrial depolarization is a trigger for the recognition and engulfment of mitochondria by autophagosomes.
  • Understanding selective mitochondrial autophagy is vital for comprehending erythroid maturation processes.
  • Insights into mitochondrial quality control via autophagy may offer protective strategies against aging and neurodegenerative conditions.