Effects of salmeterol on muscarinic inhibition of adenylyl cyclase in bovine trachealis cells

被引:5
作者
Ethier, MF [1 ]
Dextradeur, T [1 ]
Schaefer, OP [1 ]
Madison, JM [1 ]
机构
[1] Univ Massachusetts, Sch Med, Worcester, MA 01655 USA
关键词
salmeterol; beta-adrenergic agonist; muscarinic receptor; cyclic AMP; airway smooth muscle;
D O I
10.1016/S0024-3205(00)00854-7
中图分类号
R-3 [医学研究方法]; R3 [基础医学];
学科分类号
1001 ;
摘要
The goal was to assess whether salmeterol, a potent and long-acting beta-2-adrenergic agonist used in the treatment of asthma, also has non-beta-2-adrenergic effects on the stimulation or inhibition of adenylyl cyclase activity. Salmeterol (100 nM) maximally stimulated cAMP accumulation in enzyme dispersed bovine trachealis cells and this was entirely inhibited by propranolol, as expected for beta-adrenergic stimulation. However, the same concentration of salmeterol also antagonized carbachol inhibition of cAMP accumulation and altered binding of carbachol to muscarinic receptors. These effects of salmeterol were sensitive to washing of the cells and this was not consistent with a beta-2-adrenergic mechanism. The findings suggested that the maximal, beta-2-adrenergic stimulation of cAMP accumulation by salmeterol was accompanied by a non-beta-2-adrenergic interaction of salmeterol with muscarinic receptors that attenuated muscarinic inhibition of adenylyl cyclase. (C) 2000 Elsevier Science Inc. All rights reserved.
引用
收藏
页码:2753 / 2758
页数:6
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