Tachyphylaxis to inhaled histamine in asthmatic subjects

P. J. Manning, G. L. Jones, P. M. O'Byrne

Research output: Contribution to journalArticlepeer-review

Abstract

The bronchoconstriction induced by repeated histamine inhalation tests was studied in eight mild stable asthmatic subjects to determine whether histamine tachyphylaxis occurs in asthmatics. We also studied the specificity of histamine tachyphylaxis by examining for tachyphylaxis in response to inhaled acetylcholine in these subjects. We subsequently investigated whether indomethacin pretreatment inhibited histamine tachyphylaxis. Tachyphylaxis in response to inhaled histamine occurred in all subjects. The mean histamine provocative concentration causing a 20% fall in the forced expiratory volume in 1 s (PC20) increased from 3.04 ± 1.9 (%SD), to 4.88 ± 1.9, and to 6.53 ± 2.2 mg/ml (P < 0.0005) with successive inhalation tests. Tachyphylaxis was still present at 3 h (P < 0.01), but not in all subjects at 6 h (P > 0.05). Tachyphylaxis, however, did not occur in response to inhaled acetylcholine. In addition, indomethacin pretreatment prevented histamine tachyphylaxis. Thus this study demonstrates that there is a histamine-specific mechanism that can partially protect the airways against repeated bronchoconstriction caused by histamine. This effect may occur through the release of inhibitory prostaglandins in the airway after histamine stimulation. Also when histamine inhalation tests are repeated on the same day, the tests should be separated by >6 h to avoid tachyphylaxis.

Original languageEnglish
Pages (from-to)1572-1577
Number of pages6
JournalJournal of Applied Physiology
Volume63
Issue number4
Publication statusPublished - 1 Dec 1987
Externally publishedYes

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