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Related Experiment Videos

Mast cell mediators regulate vascular permeability changes in Arthus reaction.

B F Ramos1, Y Zhang, V Angkachatchai

  • 1Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St. Louis, Missouri.

The Journal of Pharmacology and Experimental Therapeutics
|August 1, 1992
PubMed
Summary

Mast cells and their mediators, histamine and serotonin, are crucial for regulating plasma exudation during early inflammation. These cells are vital for synthesizing leukotrienes involved in immune complex-induced vascular permeability.

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Area of Science:

  • Immunology
  • Inflammation research
  • Vascular biology

Background:

  • Plasma exudation is a hallmark of acute inflammation.
  • Mast cells and their mediators play a potential role in immune complex-induced injury and vascular permeability.

Purpose of the Study:

  • To investigate the role of mast cells and their mediators in plasma exudation during immune complex-induced inflammation.
  • To assess the contribution of mast cell-derived mediators like histamine, serotonin, and leukotrienes to vascular permeability.

Main Methods:

  • Utilized mast cell-deficient mice (WBB6F1-W/Wv) and their congenic controls (WBB6F1-+/+).
  • Induced immune complex injury via reverse passive Arthus reaction with varying antibody doses.
  • Quantified dye exudation to measure plasma leakage over time.

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  • Administered mast cell reconstitution, histamine/serotonin receptor antagonists (pyrilamine, methysergide), and a 5-lipoxygenase inhibitor (A-63162).

    • Main Results:

    • Mast cell-deficient mice exhibited significantly reduced plasma exudation compared to controls, particularly at lower antibody doses.
    • This deficit in vascular permeability was reversed by mast cell reconstitution.
    • In normal mice, histamine/serotonin antagonists and a 5-lipoxygenase inhibitor significantly reduced plasma exudation.
    • None of the tested inhibitors affected plasma permeation in mast cell-deficient mice.

    Conclusions:

    • Mast cell mediators, specifically histamine and serotonin, are key regulators of vascular permeability in the early stages of immune complex-mediated inflammation.
    • Mast cells are important for the synthesis of leukotrienes, which also contribute to increased vascular permeability.
    • The findings highlight the central role of mast cells in modulating inflammatory responses and vascular leakage.