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Related Experiment Videos

Anaphylaxis mediated through a humanized high affinity IgE receptor

D Dombrowicz1, A T Brini, V Flamand

  • 1Molecular Allergy and Immunology Section, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|August 15, 1996
PubMed
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Researchers created a "humanized" mouse model to study IgE-mediated anaphylaxis. This model successfully mimics human immune responses, enabling the testing of new therapies targeting the high-affinity IgE receptor.

Area of Science:

  • Immunology
  • Allergy Research
  • Transgenic Models

Background:

  • Mast cells and basophils mediate anaphylaxis via the high-affinity IgE receptor (Fc epsilon RI).
  • Mice lacking Fc epsilon RI are resistant to passive anaphylaxis, limiting in vivo study of human IgE responses.

Purpose of the Study:

  • To develop a novel in vivo mouse model that accurately mimics human IgE-mediated anaphylaxis.
  • To create a platform for evaluating therapeutic agents targeting the human Fc epsilon RI receptor.

Main Methods:

  • Utilized transgenic and embryonic stem cell technology to replace the murine Fc epsilon RI alpha-chain with its human counterpart.
  • Generated a "humanized" mouse line expressing a chimeric human-murine high-affinity IgE receptor.

Main Results:

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  • The humanized receptor, composed of the human alpha-chain and murine beta/gamma-chains, initiates intracellular signaling upon allergen challenge.
  • The human Fc epsilon RI alpha-chain restored anaphylactic responses in alpha-deficient mice, validating the model's efficacy.

Conclusions:

  • The developed humanized mouse model effectively replicates IgE-mediated anaphylaxis, serving as a valuable tool for immunological research.
  • This model offers a promising system for preclinical testing of therapeutics designed to modulate human Fc epsilon RI-dependent allergic reactions.