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Tachykinins in propranolol-augmented, hyperpnoea-induced bronchoconstriction in Taida guinea-pigs: effects of dimethylthiourea.

作者信息

Lin C W, Lai Y L

机构信息

Department of Physiology, National Taiwan University College of Medicine, Taipei.

出版信息

J Auton Pharmacol. 1998 Jun;18(3):139-47. doi: 10.1046/j.1365-2680.1998.1830139.x.

DOI:10.1046/j.1365-2680.1998.1830139.x
PMID:9754634
Abstract
  1. The present authors recently found that a marked hyperpnoea-induced bronchoconstriction (HIB) only occurred in guinea-pigs after treatment with propranolol, a non-selective beta-adrenoceptor antagonist. This study investigated tachykinin-dependent and antioxidant-modulated mechanisms for this propranolol-augmented HIB. 2. Guinea-pigs were pre-treated with an antioxidant, dimethylthiourea (DMTU), or saline for 3 days. On the day of study, each animal was given a dose of propranolol (0.5 mg kg(-1)), then the airway function was examined in the anaesthetized-paralysed animal before, during and after hyperpnoea with a dry 95% O2:5% CO2 gas mixture. Tracheal neutral endopeptidase (NEP) activity and plasma substance P (SP) level were measured after functional study. 3. In the presence of propranolol, HIB was augmented, and was found to be associated with decreased NEP activity and an increased plasma SP level. The augmented HIB was attenuated by DMTU. 4. Therefore, the present results suggest that propranolol-augmented HIB is tachykinin-dependent and is modulated by DMTU.
摘要

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