Role of adrenergic nervous system in cigarette smoke-induced bronchoconstriction in guinea pigs

Koichiro Matsumoto, Hisamichi Aizawa, Hiromasa Inoue, Shohei Takata, Mutsumi Shigyo, Nobuyuki Hara

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The goal of this study was to clarify the role of the adrenergic nervous system in bronchoconstriction induced by exposure to cigarette smoke in guinea pigs. Artificially ventilated animals were exposed to 160 puffs of smoke for 8 min. Bronchoconstriction was assessed as a percentage of the baseline total pulmonary resistance (R(L)). The effects of pretreatment with phentolamine (0.1 mg/kg, i.v.), propranolol (1 mg/kg, i.v.), and/or atropine (1 mg/kg, i.v.) were evaluated. Exposure to cigarette smoke caused significant bronchoconstriction. Phentolamine, an α-adrenoceptor antagonist, significantly inhibited cigarette smoke-induced bronchoconstriction, while propranolol, a β-adrenoceptor antagonist, significantly enhanced it. Combined use of these compounds further enhanced the bronchoconstriction. All of modulations of the bronchoconstriction by adrenoceptor antagonists were completely abolished by pretreatment with atropine. Phentolamine and/or propranolol had no effect on the bronchoconstriction induced by inhaled acetylcholine. Pretreatment with yohimbine (0.5 mg/kg, i.v.), a selective α2-adrenoceptor antagonist, showed modulatory effects similar to those of phentolamine on cigarette smoke-induced bronchoconstriction. These results suggest that cigarette smoke-induced bronchoconstriction is regulated by the prejunctional modulation of the cholinergic system via α- and β-adrenoceptors. This mechanism may be modulated by the autoregulation of adrenergic nerves via the α2-autoreceptor. Copyright (C) 1998 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)49-54
Number of pages6
JournalEuropean Journal of Pharmacology
Volume358
Issue number1
DOIs
Publication statusPublished - Sep 25 1998

All Science Journal Classification (ASJC) codes

  • Pharmacology

Fingerprint Dive into the research topics of 'Role of adrenergic nervous system in cigarette smoke-induced bronchoconstriction in guinea pigs'. Together they form a unique fingerprint.

Cite this