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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...

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.

Caspases

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.

The Extrinsic Apoptotic Pathway

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...

Cellular Injury IlI: Cellular Death

Cellular Injury IlI: Cellular Death

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...

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...

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Related Experiment Video

Updated: May 26, 2026

Use of LysoTracker to Detect Programmed Cell Death in Embryos and Differentiating Embryonic Stem Cells

Use of LysoTracker to Detect Programmed Cell Death in Embryos and Differentiating Embryonic Stem Cells

Published on: October 11, 2012

Role of programmed cell death in development.

R M Ranganath¹, N R Nagashree

¹Department of Botany, Bangalore University, Jnanabharathi, India.

International Review of Cytology

|November 4, 2000

Summary

This summary is machine-generated.

Programmed cell death (PCD) research reveals distinct mechanisms in animals and plants. While animal PCD involves caspases and phagocytosis, plants exhibit unique cell elimination strategies due to their cell walls.

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Area of Science:

Comparative biology
Cellular biology
Developmental biology

Background:

Programmed cell death (PCD) is crucial for development in both animals and plants.
Animal PCD research has identified key pathways involving caspases, mitochondria, and phagocytosis.
Plant cell death mechanisms remain less understood and differ significantly from animal models.

Purpose of the Study:

To compare and contrast programmed cell death (PCD) mechanisms in animals and plants.
To highlight the unique features of plant cell death in the context of eukaryotic cell elimination.
To provide a holistic view of cell death across different eukaryotic systems.

Main Methods:

Review and synthesis of existing literature on animal and plant programmed cell death.
Comparative analysis of molecular and cellular events in PCD across species.
Identification of conserved and divergent pathways in eukaryotic cell death.

Main Results:

Animal PCD is characterized by induction, caspase mediation, DNA degradation, and phagocytosis.
Plant PCD lacks typical animal apoptotic hallmarks like DNA laddering and apoptotic bodies due to the cell wall.
Viral strategies to inactivate caspases offer insights into host-pathogen interactions and cell death modulation.

Conclusions:

Significant differences exist in the execution of programmed cell death between animals and plants.
Plant cell death involves novel mechanisms distinct from the well-characterized animal pathways.
Further research is needed to fully elucidate plant cell death pathways for a comprehensive understanding of eukaryotic PCD.