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Measuring Local Anaphylaxis in Mice
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The decrease in peripheral blood basophils in a mouse model of IgE-induced inflammation involves their migration to

Ni Ma1, Izumi Kishimoto2, Aki Tajima1

  • 1Department of Dermatology, Kansai Medical University, Hirakata, Japan.

Journal of Dermatological Science
|October 4, 2024
PubMed
Summary

Urticaria involves basopenia, a decrease in blood basophils. This IgE-mediated mouse model shows basophils migrate to lymph nodes, not skin lesions, during inflammation.

Keywords:
BasopeniaBasophilIgEMouse modelUrticaria

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Area of Science:

  • Immunology
  • Allergy research
  • Dermatology

Background:

  • Urticaria (hives) is associated with a decrease in peripheral blood basophils (basopenia) during active phases.
  • Previous research linked basopenia to basophil skin migration in a Th2-driven contact dermatitis model.

Purpose of the Study:

  • To establish and evaluate an IgE-mediated mouse model for urticaria.
  • To determine if this model reproduces basopenia observed in human urticaria.
  • To investigate basophil dynamics and migration patterns in an IgE-mediated allergic response.

Main Methods:

  • Mice were sensitized with 2,4,6-trinitrophenylhaptene (TNP)-specific IgE.
  • Basophil changes were monitored after challenge with TNP-ovalbumin.
  • Mast cell-deficient mice were used to assess mast cell involvement.

Main Results:

  • The IgE-mediated model induced immediate ear swelling and basopenia within 0.5 hours.
  • Basophils were found in higher numbers in antigen-draining lymph nodes (LN) compared to skin lesions.
  • In mast cell-deficient mice, reduced LN basophil increase suggested impaired antigen transport, while skin basophils persisted.

Conclusions:

  • An IgE-mediated mouse model successfully replicated urticaria-associated basopenia and skin inflammation.
  • Basophil migration to lymph nodes, rather than skin, was observed in this model.
  • Findings highlight the importance of considering systemic immune compartments, like lymph nodes, in urticaria pathogenesis.