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Related Experiment Videos

Active anaphylaxis in IgE-deficient mice

H C Oettgen1, T R Martin, A Wynshaw-Boris

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115.

Nature
|August 4, 1994
PubMed
Summary
This summary is machine-generated.

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Mice lacking immunoglobulin E (IgE) still experienced anaphylaxis, demonstrating that non-IgE pathways can trigger these severe allergic reactions in vivo. This finding reveals alternative mechanisms for hypersensitivity.

Area of Science:

  • Immunology
  • Allergy Research
  • Mast Cell Biology

Background:

  • Immediate hypersensitivity reactions, like anaphylaxis, are primarily attributed to IgE-mediated mast cell activation.
  • The in vivo relevance of non-IgE mediated mast cell and basophil activation remains unclear.

Purpose of the Study:

  • To investigate whether non-immunoglobulin E (IgE) stimuli can induce physiological hypersensitivity reactions in vivo.
  • To determine the role of IgE in anaphylaxis.

Main Methods:

  • Generation of mice with a homozygous null mutation in the C epsilon gene, rendering them unable to produce IgE.
  • Antigen challenge of sensitized IgE-deficient mice and comparison of anaphylactic responses with wild-type animals.
  • Assessment of physiological changes including tachycardia, pulmonary function, vascular leak, plasma histamine levels, and survival.

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Main Results:

  • IgE-deficient mice exhibited anaphylaxis upon antigen challenge, showing symptoms similar to wild-type mice.
  • These reactions involved tachycardia, pulmonary changes, vascular leak, elevated histamine, and mortality.
  • The IgE-independent anaphylaxis did not require complement activation but necessitated a functional immune system.

Conclusions:

  • Non-immunoglobulin E (IgE) pathways are capable of inducing anaphylaxis in vivo.
  • These findings demonstrate the existence of IgE-independent hypersensitivity reactions.
  • The immune system plays a crucial role in IgE-independent anaphylaxis.