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Related Experiment Videos

Anaphylaxis: lessons from mouse models.

Fred D Finkelman1

  • 1Department of Medicine, Cincinnati Veterans Affairs Medical Center, Ohio, USA. ffinkelman@pol.net

The Journal of Allergy and Clinical Immunology
|September 4, 2007
PubMed
Summary
This summary is machine-generated.

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Two pathways of anaphylaxis exist: IgE-mediated and IgG-mediated. While IgE requires less antigen, IgG can block or mediate anaphylaxis depending on antigen quantity, offering new targets for allergy treatments.

Area of Science:

  • Immunology
  • Allergy Research

Background:

  • Systemic anaphylaxis involves distinct IgE and IgG pathways.
  • The classic pathway uses IgE, mast cells, and histamine, while an alternative pathway involves IgG and macrophages.
  • IgG antibodies can modulate IgE-mediated anaphylaxis, blocking it at low antigen levels but mediating it at high levels.

Purpose of the Study:

  • To elucidate the mechanisms of systemic and intestinal anaphylaxis.
  • To investigate the role of different immune components and pathways in anaphylaxis.
  • To identify potential targets for novel prophylactic agents against anaphylaxis.

Main Methods:

  • Studies utilized mouse models to demonstrate anaphylaxis pathways.
  • Analysis of immune cell interactions, mediators (histamine, PAF, serotonin), and signaling pathways (cytokines, nitric oxide).

Related Experiment Videos

  • Investigation of inhibitory receptors and ion channels influencing anaphylaxis severity.

    • Main Results:

    • Demonstrated two distinct pathways for systemic anaphylaxis: IgE-dependent and IgG-dependent.
    • Showed that IgG antibodies can both inhibit and mediate anaphylaxis based on antigen concentration.
    • Identified factors increasing (nitric oxide, IL-4, IL-13) and decreasing (beta-adrenergic stimulation) anaphylaxis severity.
    • Found intestinal anaphylaxis to be primarily IgE and mast cell dependent.
    • Highlighted the potential for innate immune system activation by food allergens.

    Conclusions:

    • Mouse models reveal complex IgE and IgG roles in systemic anaphylaxis.
    • The alternative IgG pathway's relevance in humans requires further study.
    • Novel prophylactic strategies targeting specific pathways and mediators are proposed, including anti-IgE, cytokine antagonists, and receptor modulators.