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Autophagic Cell Death

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...

Cellular Injury V: Apoptosis and Autophagy

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...

Overview of Cell Death

Overview of Cell Death

Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...

Autophagy

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 Lysosome

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...

Phagocytosis of Apoptotic Cells

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.

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Related Experiment Video

Updated: May 7, 2026

LPS and ATP-induced Death of PMA-differentiated THP-1 Macrophages and its Validation

LPS and ATP-induced Death of PMA-differentiated THP-1 Macrophages and its Validation

Published on: May 3, 2024

Autophagy and cell death.

Tohru Yonekawa¹, Andrew Thorburn

¹Department of Pharmacology, University of Colorado Anschutz Medical Campus, Aurora, CO 80045, U.S.A.

Essays in Biochemistry

|September 28, 2013

Summary

This summary is machine-generated.

Autophagy, a cellular degradation process, is closely linked to programmed cell death (apoptosis). Understanding how autophagy influences cell death mechanisms is crucial for developing new disease treatments.

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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Autophagy and apoptosis are fundamental cellular processes involving distinct but interconnected molecular pathways.
Shared proteins can regulate both autophagy and apoptosis, highlighting a complex interplay.
The precise molecular mechanisms by which autophagy influences cell death remain incompletely understood.

Purpose of the Study:

To review the current understanding of the molecular connections between autophagy and cell death.
To elucidate how autophagy signaling regulates apoptosis and other cell death pathways.
To identify the substrates degraded by autophagy that mediate its pro- or anti-death effects.

Main Methods:

Literature review of studies investigating autophagy and cell death.
Analysis of molecular signaling pathways common to both processes.
Discussion of experimental evidence linking autophagy substrates to cell death outcomes.

Main Results:

Autophagy can either promote or inhibit cell death depending on the cellular context.
Specific proteins are involved in regulating both autophagy and apoptosis.
The degradation targets of autophagy that mediate its role in cell death are often unknown.

Conclusions:

The relationship between autophagy and cell death is complex and context-dependent.
Further research is needed to identify the specific molecular players and substrates involved in autophagy-mediated cell death.
A deeper understanding of these interactions may reveal novel therapeutic strategies for diseases involving dysregulated cell death.