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Related Concept Videos

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...
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,...
Other Stress Responses in Bacteria01:30

Other Stress Responses in Bacteria

Bacteria have global regulatory systems that control several types of stress mechanisms. These include Pho regulon and the heat shock response, which are essential systems for environmental adaptation, such as nutrient limitation and proteotoxic stress. The Pho regulon and the heat shock response exemplify bacterial resilience, enabling rapid adaptation to fluctuating environmental conditions.Pho RegulonBacteria require phosphorus for essential cellular processes, including nucleic acid...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
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...
The Unfolded Protein Response01:37

The Unfolded Protein Response

The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...

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Related Experiment Video

Updated: Jun 7, 2026

Measurements of Physiological Stress Responses in C. Elegans
10:36

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Autophagy and the integrated stress response.

Guido Kroemer1, Guillermo Mariño, Beth Levine

  • 1INSERM, U848, 39 rue Calmette Desmoulins, 94805 Villejuif, France. kroemer@orange.fr

Molecular Cell
|October 23, 2010
PubMed
Summary

Autophagy is a cellular process for degrading damaged components, activated by various stresses. It integrates with other cellular stress responses, acting as a key part of the cell

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Autophagy is a fundamental cellular process involving lysosomal degradation.
  • It clears damaged organelles and cytosolic components.
  • Autophagy is crucial for maintaining cellular homeostasis.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of autophagy.
  • To understand how autophagy integrates with other cellular stress responses.
  • To highlight autophagy's role in the integrated stress response.

Main Methods:

  • Review of signaling pathways governing autophagy.
  • Analysis of stimulus-dependent and independent regulation.
  • Examination of cross-talk between autophagy and other stress responses.

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Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication
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Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Published on: June 14, 2024

Related Experiment Videos

Last Updated: Jun 7, 2026

Measurements of Physiological Stress Responses in C. Elegans
10:36

Measurements of Physiological Stress Responses in C. Elegans

Published on: May 21, 2020

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication
10:12

Measuring Endoplasmic Reticulum Stress and Unfolded Protein Response in HIV-1 Infected T-Cells and Analyzing its Role in HIV-1 Replication

Published on: June 14, 2024

Main Results:

  • Autophagy is triggered by diverse cellular stresses like nutrient deprivation and hypoxia.
  • Specific and general signaling pathways coordinate autophagy.
  • Autophagy integrates with other stress responses via parallel or mutual control.

Conclusions:

  • Autophagy is a central component of the integrated cellular stress response.
  • Its regulation is complex and involves multiple signaling networks.
  • Understanding autophagy is key to comprehending cellular adaptation to stress.