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. 1992 Feb;105(2):448–452. doi: 10.1111/j.1476-5381.1992.tb14273.x

Capsaicin-induced bronchoconstriction in the guinea-pig: contribution of vagal cholinergic reflexes, local axon reflexes and their modulation by BW443C81.

P Buchan 1, J J Adcock 1
PMCID: PMC1908653  PMID: 1559133

Abstract

1 The objective of the study was to investigate the central vagal and local axon reflex components of bronchoconstrictor responses evoked by inhalation of capsaicin aerosol in anaesthetized guinea-pigs. This was accomplished by comparing the effects of bilateral vagotomy, atropine and the peripherally-acting polar enkephalin analogue, BW443C81, on bronchoconstrictor responses evoked by capsaicin. The effects of codeine were also determined. 2 Aerosols of capsaicin were generated from a 0.9 microgram ml-1 solution. Inhalation of capsaicin aerosol in 5, 10 and 15 breaths evoked dose-related bronchoconstrictor responses. The responses were immediate in onset and of extended duration. 3 Capsaicin-induced bronchoconstrictor responses were significantly inhibited following bilateral vagotomy or atropine (0.3 mg kg-1, i.v.) pretreatment by 46% +/- 14% (P less than 0.05) and 59% +/- 13% (P less than 0.01), respectively. 4 Administration of BW443C81 by intravenous infusion (3, 30 and 100 micrograms kg-1 min-1) caused a significant inhibition of capsaicin-induced bronchoconstrictor responses which achieved a greater maximum than either bilateral vagotomy or atropine. Codeine (100 micrograms kg-1 min-1, i.v.) did not significantly inhibit the bronchoconstrictor responses. 5 Inhibition of capsaicin-induced bronchoconstrictor responses by BW443C81 (30 micrograms kg-1 min-1, i.v.) was significantly (P less than 0.05) reduced by the peripherally-acting opioid antagonist N-methyl nalorphine (100 micrograms kg-1 min-1, i.v.). 6 These results show that capsaicin-induced bronchoconstrictor responses are mediated by at least two mechanisms, a vagal and/or cholinergic reflex pathway and a non-cholinergic pathway.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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