Dexamethasone inhibits the antigen-induced contractile activity and release of inflammatory mediators in isolated guinea pig lung tissue

R. P. Schleimer, B. J. Undem, S. Meeker, M. E. Bollinger, N. F. Adkinson, L. M. Lichtenstein, G. K. Adams

Research output: Contribution to journalArticle

Abstract

Treatment for 24 h in vitro with dexamethasone inhibited the antigen-induced contractile responses in guinea pig tracheal rings and parenchymal strips without inhibiting the contractile response of the tissues to either methacholine or histamine, respectively. Antigen-induced histamine release was inhibited by approximately 50% in both tissues by prior treatment with dexamethasone. Dexamethasone treatment also inhibited the release of immunoreactive sulfidopeptide leukotriene from parenchymal strips. In tracheal rings, dexamethasone treatment reduced spontaneous release of all cyclooxygenase metabolites (PGE2, PGF(2α), TxB2, PGD2, and 6-k-PGF(1α) were tested), with the exception of PGD2, and also inhibited the antigen-induced release of all cyclooxygenase metabolites studied. Dexamethasone-treatment did not inhibit the spontaneous release of cyclooxygenase metabolites in the guinea pig lung strips, and only modestly inhibited the antigen-induced release of PGE2, PGF(2α), and PGD2. The results suggest that the inhibition of contractile response of guinea pig lung strips and airway tissue to antigen by dexamethasone is the result of a reduced release of inflammatory mediators. The inhibition by dexamethasone of antigen-induced release of mast cell mediators from guinea pig lung parenchyma contrasts with results previously obtained with human parenchymal lung tissue.

Original languageEnglish (US)
Pages (from-to)562-566
Number of pages5
JournalAmerican Review of Respiratory Disease
Volume135
Issue number3
Publication statusPublished - 1987

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ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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