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Related Experiment Videos

Mediators of C5a-induced bronchoconstriction.

J F Regal1

  • 1Department of Pharmacology, University of Minnesota, Duluth 55812.

Agents and Actions
|August 1, 1987
PubMed
Summary

Complement component 5a (C5a) causes bronchoconstriction in guinea pigs, mediated by thromboxane. This study found that leukotrienes do not play a significant role in this C5a-induced airway narrowing.

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Area of Science:

  • Immunology
  • Pharmacology
  • Respiratory Medicine

Background:

  • Previous research implicated histamine and arachidonate metabolites in C5a-induced bronchoconstriction.
  • The specific arachidonate metabolite(s) responsible remained unclear.

Purpose of the Study:

  • To identify the specific arachidonate metabolite(s) mediating C5a-induced bronchoconstriction in guinea pigs.
  • To investigate the roles of leukotrienes and thromboxanes in this response.

Main Methods:

  • Guinea pigs were anesthetized and artificially ventilated.
  • Pulmonary resistance and dynamic lung compliance were measured to assess bronchoconstriction.
  • The effects of a leukotriene antagonist (L-649,923) and a thromboxane synthetase inhibitor (U-63557A) were evaluated.
  • Animals were also rendered tachyphylactic to leukotriene B4 (LTB4).

Main Results:

  • C5a-induced bronchoconstriction was unaffected by the leukotriene antagonist or LTB4 tachyphylaxis, indicating leukotrienes are not major mediators.
  • C5a challenge significantly increased plasma thromboxane B2 levels.
  • The thromboxane synthetase inhibitor U-63557A partially prevented this increase and significantly inhibited C5a-induced bronchoconstriction.

Conclusions:

  • Thromboxane, not leukotrienes, appears to be the primary arachidonate metabolite responsible for C5a-induced bronchoconstriction in guinea pigs.
  • These findings highlight thromboxane's role in C5a-mediated airway responses.

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