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. 1985 May;19(5):685–692. doi: 10.1111/j.1365-2125.1985.tb02696.x

Specific antagonism of adenosine-induced bronchoconstriction in asthma by oral theophylline.

J S Mann, S T Holgate
PMCID: PMC1463831  PMID: 4005106

Abstract

The airway response to increasing concentrations of inhaled-adenosine and histamine after oral theophylline or matched placebo was studied in nine asthmatic subjects. Changes in airway calibre were followed as sGaw and FEV1 and concentration-response curves constructed. Inhaled adenosine caused concentration-related bronchoconstriction and was four-five times less potent than inhaled histamine. Theophylline, which achieved a mean plasma level of 15.9 and 16.6 micrograms/ml on the histamine and adenosine study days respectively, caused significant increases in FEV1 (17%) and sGaw (41-53%) whereas placebo had no effect. Theophylline also protected the airways against histamine-and adenosine-induced bronchoconstriction. However theophylline had a greater protective effect against adenosine (concentration-ratio 17.4 for FEV1 and 12.8 for sGaw) than against histamine (concentration ratio 5.6 for FEV1 and 5.4 for sGaw (P less than 0.05]. At therapeutic concentrations theophylline is a specific antagonist of the airway effects of adenosine in addition to being a bronchodilator and a functional antagonist.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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