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Related Concept Videos

Overview of Cell Death01:30

Overview of Cell Death

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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...
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The Extrinsic Apoptotic Pathway01:17

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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...
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The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
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Autophagic Cell Death01:18

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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.
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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. 
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Related Experiment Video

Updated: Nov 21, 2025

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
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The Antisocial Network: Cross Talk Between Cell Death Programs in Host Defense.

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|January 14, 2021
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Summary

Programmed cell death (PCD) pathways like apoptosis, pyroptosis, and necroptosis are interconnected. Emerging research reveals cell death as a complex signaling network, not linear pathways, with significant immunological implications.

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Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Biology

Background:

  • Animal cells possess proteins that initiate programmed cell death (PCD).
  • Apoptosis, pyroptosis, and necroptosis are distinct PCD forms with varying immunological outcomes.
  • Traditional views considered these pathways linear and immunologically defined.

Purpose of the Study:

  • To discuss cell death as an integrated signaling network.
  • To explore the cross-talk and evolutionary origins of cell death pathways.
  • To examine pathogen interactions with cell death mechanisms and their immunological consequences.

Main Methods:

  • Review and synthesis of recent studies on programmed cell death.
  • Analysis of molecular mechanisms underlying apoptosis, pyroptosis, and necroptosis.
  • Investigation of evolutionary connections and pathogen subversion of cell death pathways.

Main Results:

  • Recent findings challenge the linear model of PCD pathways.
  • Significant cross-talk exists between apoptosis, pyroptosis, and necroptosis.
  • Cell death pathways are increasingly viewed as a complex signaling network.

Conclusions:

  • Programmed cell death operates as a dynamic signaling network rather than discrete pathways.
  • Understanding these interconnected pathways is crucial for comprehending development, homeostasis, and immune responses.
  • Pathogen manipulation of cell death pathways highlights their central role in host-pathogen interactions and inflammation.