Role of endogenous nitric oxide in asthma

被引:24
作者
Di Maria, GU
Spicuzza, L
Mistretta, A
Mazzarella, G
机构
[1] Univ Catania, Inst Malattie Resp, I-95125 Catania, Italy
[2] Univ Naples 2, Inst Resp Dis S Marcatili, Naples, Italy
关键词
asthma; nitric oxide; smooth muscle;
D O I
10.1034/j.1398-9995.2000.00512.x
中图分类号
R392 [医学免疫学];
学科分类号
100102 ;
摘要
Endogenous nitric oxide (NO) is an ubiquitous signaling molecule with important regulatory functions such as regulation of blood pressure, neurotransmission, and host and immune defense. In the respiratory tract, NO is formed and released by various sources including endothelial and epithelial cells, nerves, airway smooth muscle, and inflammatory cells. Recent evidence suggests that endogenous NO is the neurotransmitter of the nonadrenergic noncholinergic inhibitory (iNANC) system, the only bronchorelaxant neural pathway of human airways. A number of studies also suggest that in some species epithelium-derived NO accounts for the functional bronchoprotective sole of the so-called epithelium-derived relaxing factor. In human airways, endogenous NO counteracts the bronchoconstriction induced by pharmacologic stimuli such as bradykinin, histamine, and methacholine. On the basis of these and other observations, it is suggested that a reduced synthesis and/or activity of endogenous NO may contribute to the pathogenesis of airway hyperresponsiveness that characterizes asthma and other respiratory disorders. This short paper summarizes the activities of endogenous NO in the airways of experimental animals and man, and discusses the evidence supporting the view that NO confers bronchoprotection.
引用
收藏
页码:31 / 35
页数:5
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