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Related Concept Videos

Necrosis01:16

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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”.
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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.
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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Microbial predation refers to the process by which one microorganism kills and consumes another to obtain nutrients and energy. It encompasses both bacterial and protozoan predators. This interaction plays a crucial role in shaping microbial communities and regulating nutrient cycling.Bacterial Predators: Epibiotic vs. EndobioticBacterial predators are classified based on their mode of attack as either epibiotic or endobiotic. Epibiotic predators, such as Vampirococcus, attach to the surface of...
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Updated: Mar 22, 2026

Characterization of MLKL-mediated Plasma Membrane Rupture in Necroptosis
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How are necrotic cells recognized by their predators?

Zao Li1, Zheng Zhou1

  • 1Verna and Marrs McLean Department of Biochemistry and Molecular Biology, Baylor College of Medicine , Houston, TX, USA.

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|April 14, 2016
PubMed
Summary
This summary is machine-generated.

Necrotic cells are recognized by engulfing cells via phosphatidylserine (PS) exposure, a process crucial for clearing dead cells. This study reveals novel molecular mechanisms for this recognition, conserved across species.

Keywords:
ABC transporterCa2+ influxapoptosisdying-cell clearanceengulfmentexcitotoxicitynecrosisphagocytic receptorphosphatidylserinephospholipid scramblase“eat me” signal

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Developmental Biology

Background:

  • Necrosis, a cell death mode from injury, is implicated in diseases like cancer and neurodegeneration.
  • Efficient removal of necrotic cells by engulfing cells is vital, but recognition mechanisms are unclear.
  • Understanding necrotic cell clearance is crucial for developing therapies for related human diseases.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which engulfing cells recognize and clear necrotic cells.
  • To identify the specific receptor-ligand interactions involved in necrotic cell recognition.
  • To investigate the mechanisms of phosphatidylserine exposure in necrotic cells.

Main Methods:

  • Utilized C. elegans touch neurons undergoing excitotoxic necrosis as a model system.
  • Investigated the role of the phagocytic receptor CED-1 and its ligand phosphatidylserine (PS).
  • Analyzed plasma membrane integrity and phosphatidylserine exposure during necrosis.

Main Results:

  • Identified the CED-1/phosphatidylserine (PS) pair as key for necrotic neuron recognition.
  • Demonstrated that necrotic neurons expose PS while maintaining plasma membrane integrity.
  • Discovered two distinct mechanisms for PS exposure in necrosis, one shared with apoptosis and one unique.

Conclusions:

  • The CED-1/phosphatidylserine interaction is a conserved mechanism for necrotic cell recognition.
  • Necrotic cells actively regulate PS exposure, challenging previous assumptions about membrane rupture.
  • Calcium influx plays a role in activating PS scramblase for PS exposure during necrosis.