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Neutrophil Extracellular Traps: How to Generate and Visualize Them
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Neutrophil Extracellular Traps: How to Generate and Visualize Them

Published on: February 25, 2010

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Neutrophils give us a shock.

Clifford A Lowell1

  • 1Department of Laboratory Medicine, UCSF, San Francisco, California 94143-0451, USA. clifford.lowell@ucsf.edu

The Journal of Clinical Investigation
|March 26, 2011
PubMed
Summary

Anaphylaxis is not solely IgE-mediated. IgG antibodies binding to neutrophil receptors (FcγRIII/IV) can also trigger this severe allergic reaction, requiring a reevaluation of current models and treatments.

Area of Science:

  • Immunology
  • Allergy Research
  • Cellular Signaling

Background:

  • Systemic anaphylaxis is traditionally attributed to IgE-mediated mast cell activation and subsequent mediator release, causing hypotension and shock.
  • Existing models may oversimplify the complex mechanisms underlying anaphylaxis.

Discussion:

  • Jönsson et al. demonstrate that IgG1 and IgG2 antibodies binding to FcγRIII and FcγRIV receptors on neutrophils represent a significant pathway for inducing anaphylaxis in mice.
  • This finding challenges the exclusive focus on IgE in anaphylaxis pathogenesis.

Key Insights:

  • Neutrophil Fcγ receptors (FcγRIII/IV) play a critical role in IgG-antibody-induced anaphylaxis.
  • IgG antibodies can act as potent anaphylaxis inducers, independent of IgE.
  • This study reveals a novel mechanism for anaphylaxis initiation.

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Outlook:

  • Reevaluation of human anaphylaxis models is necessary to incorporate IgG-mediated pathways.
  • Therapeutic strategies for anaphylaxis prevention may need to target IgG-Fcγ receptor interactions.
  • Further research is warranted to fully elucidate the role of IgG in human anaphylaxis.