Bradykinin causes airway hyperresponsiveness and enhances maximal airway narrowing: Role of microvascular leakage and airway edema

K. Kimura, H. Inoue, M. Ichinose, M. Miura, U. Katsumata, T. Takahashi, T. Takishima

研究成果: Article

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The relationship between bronchial edema and airway responsiveness was studied in cats in situ. Five cats were exsanguinated, and the bronchial arteries were perfused. We monitored pulmonary resistance (RL), and the provocative dose of acetylcholine (ACh) required to produce a 300% increase in RL (PD300) was determined. Bronchial vascular permeability was measured by quantifying extravasation of Evans blue (EB) dye. Bradykinin (BK) and ACh were administered via the bronchial arteries to increase leakage and bronchoconstriction, respectively. BK preperfusion (for 30 min) significantly increased bronchial vascular permeability to four times the control values (p < 0.05). BK preperfusion did not alter baseline R(L) but caused hyperresponsiveness to ACh, with log [PD300 (mole)] of -6.53 ± 0.42 (mean ± SD) and -6.90 ± 0.30, before and after BK, respectively (p < 0.01). Furthermore, the maximal airway narrowing after BK was 58% higher than before BK (p < 0.01). Histologic study showed peribronchial edema after BK. The enhancement of maximal airway narrowing was significantly correlated with the degree of EB dye extravasation. These results suggest that BK causes airway hyperresponsiveness to ACh and increases maximal airway narrowing, possibly because of airway edema.

元の言語English
ページ(範囲)1301-1305
ページ数5
ジャーナルAmerican Review of Respiratory Disease
146
発行部数5
DOI
出版物ステータスPublished - 1992 1 1

ASJC Scopus subject areas

  • Pulmonary and Respiratory Medicine

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