Major cell death pathways at a glance

Linde Duprez1, Ellen Wirawan, Tom Vanden Berghe

  • 1VIB, Department for Molecular Biomedical Research, Unit for Molecular Signaling and Cell Death, Technologiepark 927, B-9052 Ghent (Zwijnaarde), Belgium.

Microbes and Infection
|September 8, 2009
PubMed

Insights

This review explores programmed cell death (PCD) mechanisms, including apoptosis, necrosis, autophagic cell death, and pyroptosis. Understanding these processes is vital for development, immunity, and disease research.

Area of Science:

  • Cellular Biology
  • Immunology
  • Pathology

Background:

  • Cell death is essential for multicellular organism development, homeostasis, and immune regulation.
  • Dysregulation of cell death pathways is linked to various pathologies.
  • Pathogens can manipulate host cell death as a survival strategy.

Purpose of the Study:

  • To review the molecular mechanisms of four major programmed cell death types.
  • To discuss the physiological relevance of these cell death pathways.
  • To highlight the interplay between pathogens and host cell death.

Main Methods:

  • Literature review of programmed cell death.
  • Analysis of molecular mechanisms.
  • Discussion of physiological roles and pathological implications.

Main Results:

  • Detailed overview of apoptosis, necrosis, autophagic cell death, and pyroptosis.
  • Explanation of how pathogens modulate host cell death.
  • Elucidation of the significance of cell death in health and disease.

Conclusions:

  • Programmed cell death encompasses diverse pathways with critical functions.
  • Pathogen interactions with cell death mechanisms are complex.
  • Further research into cell death is crucial for understanding and treating diseases.

Related Concept Videos

Overview of Cell Death01:30

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...
Necrosis01:16

Necrosis

Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
Apoptosis01:30

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.
Cellular Injury IlI: Cellular Death01:11

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...
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...
The Extrinsic Apoptotic Pathway01:17

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...