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Allergen-induced biphasic bronchoconstriction in rats.

A Watanabe1, H Hayashi

  • 1Department of Pharmacology, Toyobo Co., Ohtsu, Japan.

International Archives of Allergy and Applied Immunology
|January 1, 1990
PubMed
Summary

A new rat model for allergic bronchoconstriction was developed, showing a biphasic increase in airway resistance. This model is useful for screening antiasthma drugs, identifying serotonin as a key mediator.

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Area of Science:

  • Pharmacology
  • Immunology
  • Respiratory Medicine

Background:

  • Asthma is a chronic respiratory disease characterized by airway inflammation and bronchoconstriction.
  • Existing animal models may not fully recapitulate the complexity of allergic asthma.
  • There is a need for reliable models to screen potential antiasthma therapeutics.

Purpose of the Study:

  • To develop and characterize a novel rat model of allergic bronchoconstriction.
  • To investigate the mediators involved in the allergic bronchoconstriction response.
  • To evaluate the utility of this model for antiasthma drug screening.

Main Methods:

  • Actively sensitized Donryu strain rats were challenged with antigen.
  • Airway resistance was measured, and plasma levels of mediators were analyzed.
  • The effects of various drugs, including disodium cromoglycate, aminophylline, methysergide, pyrilamine, FPL-55712, and OKY-046, were assessed.

Main Results:

  • A biphasic increase in airway resistance was observed post-antigen challenge, correlating with IgE titer and antigen dose.
  • Serotonin, but not histamine, induced bronchoconstriction.
  • Plasma thromboxane B2 (TxB2) levels increased, while peptide-leukotrienes (p-LTs) did not significantly increase.
  • OKY-046 inhibited bronchoconstriction and TxB2 increase, particularly in the late phase.

Conclusions:

  • The developed rat model effectively mimics allergic bronchoconstriction and is suitable for antiasthma drug screening.
  • Serotonin is a major mediator of allergic bronchoconstriction in this model.
  • Thromboxane A2 appears to play a significant role in the late phase of the response.

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