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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,...
Autophagic Cell Death01:18

Autophagic Cell Death

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.
Autophagy and Apoptosis
Autophagy can activate apoptosis. In normal conditions, the autophagy activating protein Beclin-1 and pro-apoptotic...
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...
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...
Phagocytosis of Apoptotic Cells01:17

Phagocytosis of Apoptotic Cells

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. 
Normal cells contain receptors that prevent them from being recognized by phagocytes.
The Proteasome01:13

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...

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Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy
07:20

Exploring the Regulation of Lipid Droplet Catabolism through Lipophagy

Published on: January 31, 2025

A balancing act for autophagin.

Andreas Till1, Suresh Subramani

  • 1Section of Molecular Biology, Division of Biological Sciences, University of California, San Diego, La Jolla, California, USA.

The Journal of Clinical Investigation
|June 26, 2010
PubMed
Summary
This summary is machine-generated.

Autophagy is crucial for cellular balance. A study shows blocking autophagy impairs otoconia development, affecting mammalian balance perception.

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The Lactate Dehydrogenase Sequestration Assay — A Simple and Reliable Method to Determine Bulk Autophagic Sequestration Activity in Mammalian Cells
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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

Published on: November 22, 2017

Area of Science:

  • Cell Biology
  • Physiology
  • Otolaryngology

Background:

  • Autophagy is a fundamental cellular process for degrading and recycling cellular components.
  • Dysregulation of autophagy is implicated in various physiological and pathological conditions.
  • Inner ear pathologies can lead to balance disorders.

Discussion:

  • This study investigates the role of autophagy in the development of otoconia, essential for mammalian balance.
  • Mice deficient in autophagy-related 4B (Atg4b) display reduced autophagy and defective otoconia formation.
  • The findings suggest autophagy is vital for the secretion and assembly of otoconial proteins.

Key Insights:

  • Autophagy plays a critical role in the development of the mammalian balance system.
  • Impaired autophagy disrupts the formation and function of otoconia.
  • Autophagy's role extends beyond macromolecule degradation to protein secretion and assembly.

Outlook:

  • Further research into autophagy's non-degradative functions could reveal new therapeutic targets for balance disorders.
  • Understanding the precise mechanisms of autophagy in otoconia biogenesis is warranted.
  • This work opens new avenues for exploring the link between cellular homeostasis and sensory organ function.