Effect of eotaxin and platelet-activating factor on airway inflammation and hyperresponsiveness in guinea pigs in vivo

Satoru Fukuyama, Hiromasa Inoue, Hisamichi Aizawa, Masahiro Oike, Motoji Kitaura, Osamu Yoshie, Nobuyuki Hara

研究成果: Contribution to journalArticle査読

16 被引用数 (Scopus)

抄録

Although eotaxin causes selective infiltration of eosinophils into the lung, its role in airway hyperresponsiveness remains unclear. We studied the effects of local administration of eotaxin on airway inflammation and hyperresponsiveness in guinea pigs in vivo. Airway responsiveness to inhaled histamine and differential cell counts in bronchoalveolar lavage fluid (BALF) were evaluated 12 h, 24 h, 3 d, and 7 d after intratracheal instillation of eotaxin. Significant eosinophilia in BALF was observed between 6 h and 7 d after eotaxin administration. Histologically, eosinophil accumulation was observed in the airways but not in the alveoli. In contrast, eotaxin did not affect airway responsiveness between 12 h and 7 d after its administration. We then studied the effects on airway responsiveness of subthreshold doses of interleukin 5, leukotriene D4 (LTD4), and platelet-activating factor (PAF) combined with eotaxin. Neither interleukin 5 nor LTD4 affected airway responsiveness. After eotaxin treatment, PAF significantly enhanced airway responsiveness without further increases in eosinophil counts. Eotaxin plus PAF significantly increased in eosinophil peroxidase activity in BALF compared with control and with eotaxin alone. These data indicate that eotaxin alone causes eosinophil accumulation in the airways but not hyperresponsiveness, and that additional factors such as PAF are needed to activate eosinophils for the development of airway hyperresponsiveness.

本文言語英語
ページ(範囲)1844-1849
ページ数6
ジャーナルAmerican Journal of Respiratory and Critical Care Medicine
161
6
DOI
出版ステータス出版済み - 2000
外部発表はい

All Science Journal Classification (ASJC) codes

  • 呼吸器内科
  • 集中医療医学

フィンガープリント

「Effect of eotaxin and platelet-activating factor on airway inflammation and hyperresponsiveness in guinea pigs in vivo」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル