Importance of airway inflammation for hyperresponsiveness induced by ozone.

Importance of airway inflammation for hyperresponsiveness induced by ozone.
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气道炎症对于臭氧引起的高反应性的重要性。

DOI:
10.1164/arrd.1983.127.6.686
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发表时间:
1983
期刊:
The American review of respiratory disease
影响因子:
--
通讯作者:
Nadel,JA
Nadel,JA
中科院分区:
--
文献类型:
--
作者:
Holtzman,MJ;Fabbri,LM;O'Byrne,PM;Gold,BD;Aizawa,H;Walters,EH;Alpert,SE;Nadel,JA

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我们研究了臭氧诱导的气道高反应性是否与狗气道炎症的发展相关。为了评估气道反应性,我们测定了向气道输送乙酰胆碱气溶胶所产生的肺阻力的增加。为了评估气道炎症,我们对气道黏膜进行了活检,并计算了上皮中存在的中性粒细胞的数量。在暴露于臭氧(2.1 ppm, 2 h)前、暴露后1 h和1周分别评估麻醉犬的气道反应性和炎症。6只狗的气道反应性在臭氧后1小时显著增加,并在1周后恢复到对照水平,但另外4只狗的气道反应性在臭氧后没有变化。此外,出现高反应的狗在上皮中也出现了显著的、可逆的中性粒细胞数量增加,而没有出现高反应的狗在中性粒细胞数量上没有变化。对于这组狗,臭氧暴露前后的气道反应水平与上皮中性粒细胞的数量密切相关。结果表明,臭氧诱导的气道高反应性可能取决于气道急性炎症反应的发展。
We studied whether ozone-induced airway hyperresponsiveness correlates with the development of airway inflammation in dogs. To assess airway responsiveness, we determined increases in pulmonary resistance produced by delivering acetylcholine aerosol to the airways. To assess airway inflammation, we biopsied the airway mucosa and counted the number of neutrophils present in the epithelium. Airway responsiveness and inflammation were assessed in anesthetized dogs before ozone exposure and then 1 h and 1 wk after ozone (2.1 ppm, 2 h). Airway responsiveness increased markedly at 1 h after ozone and returned to control levels 1 wk later in each of 6 dogs, but it did not change after ozone in another 4 dogs. Furthermore, dogs that became hyperresponsive also developed a marked and reversible increase in the number of neutrophils in the epithelium, whereas dogs that did not become hyperresponsive had no change in the number of neutrophils. For the group of dogs, the level of airway responsiveness before and after ozone exposure correlated closely with the number of epithelial neutrophils. The results suggest that ozone-induced airway hyperresponsiveness may depend on the development of an acute inflammatory response in the airways.
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