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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...

Cellular Injury I: Introduction

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...

Apoptosis

Apoptosis

Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.

The Intrinsic Apoptotic Pathway

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Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...

Cellular Injury IlI: Cellular Death

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Cell death is the irreversible loss of cellular structure and function, representing the final stage of severe injury. It plays a key role in both normal physiology and disease.Types of Cell DeathThe two main types are necrosis and apoptosis, though others like necroptosis and pyroptosis also exist.Necrosis:Necrosis is an unregulated form of cell death caused by severe injury such as trauma, toxins, or ischemia. It is characterized by cell swelling, membrane loss, rupture, and leakage of...

Regulation of the Unfolded Protein Response

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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...

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Updated: Jun 10, 2026

Strategies for Tracking Anastasis, A Cell Survival Phenomenon that Reverses Apoptosis

Strategies for Tracking Anastasis, A Cell Survival Phenomenon that Reverses Apoptosis

Published on: February 16, 2015

Cellular stress and apoptosis.

M Pallardy¹, M Perrin-Wolff, A Biola

¹Immunotoxicology, CJF INSERM 93-01, Faculté de Pharmacie Paris-Sud, rue J.B. Clément, 92296 Chatenay-Malabry, France.

Toxicology in Vitro : an International Journal Published in Association with BIBRA

|July 27, 2010

Summary

This summary is machine-generated.

This study details apoptosis, a programmed cell death process involving distinct morphological changes and three phases. While free radicals can trigger apoptosis, they are not essential, and DNA damage pathways involving P53 are key.

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

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Detecting Anastasis In Vivo by CaspaseTracker Biosensor

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Published on: February 1, 2018

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Apoptosis, or programmed cell death, is characterized by specific morphological changes like cell shrinkage and nuclear condensation.
The process occurs in three distinct phases: induction, effector, and degradation.
Various stimuli, including hydrogen peroxide (H2O2), can induce apoptosis, with high doses leading to necrosis.

Purpose of the Study:

To elucidate the multifaceted mechanisms and pathways involved in apoptosis.
To differentiate the roles of free radicals and DNA damage in initiating programmed cell death.
To identify key molecular events and signaling cascades crucial for apoptosis execution.

Main Methods:

Review and synthesis of existing literature on apoptosis induction and execution.
Analysis of cellular responses to oxidative stress (H2O2) and DNA-damaging agents.
Examination of signaling pathways including P53, ceramide production, and stress-activated protein kinases.

Main Results:

Low doses of H2O2 induce apoptosis, while high doses cause necrosis.
Free radicals can activate apoptosis but are not strictly required.
DNA-damaging agents trigger apoptosis via P53-mediated protease activation and other pathways like ceramide signaling.

Conclusions:

Apoptosis is a complex, multi-phase process regulated by various internal and external signals.
While oxidative stress and DNA damage are potent inducers, the precise molecular triggers and execution pathways are diverse.
Key events include P53 activation, ceramide production, and stress-activated protein kinase pathways, highlighting the intricate nature of programmed cell death.