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Research Institute for Diseases of the Chest, Faculty of Medicine, Kyushu University, Higashiku, Fukuoka 812, Japan
Received 1 February 1996; accepted in final form 22 July 1996.
Matsumoto, Koichiro, Hisamichi Aizawa, Hiromasa Inoue,
Mutsumi Shigyo, Shohei Takata, and Nobuyuki Hara. Thromboxane causes airway hyperresponsiveness after cigarette smoke-induced neurogenic inflammation. J. Appl.
Physiol. 81(6): 2358-2364, 1996.
We investigated
the role of neurogenic inflammation and the subsequent mechanisms in
cigarette smoke-induced airway hyperresponsiveness in guinea pigs.
Exposure to cigarette smoke was carried out at tidal volume for 3 min.
Airway responsiveness to histamine was determined before and after
smoke exposure followed by bronchoalveolar lavage (BAL). Plasma
extravasation was evaluated by measuring the extravasation of Evans
blue dye in the airway. Cigarette smoke produced significant airway
hyperresponsiveness and plasma extravasation, with an influx of
neutrophils in BAL fluid. FK-224 (10 mg/kg iv), a tachykinin antagonist
at NK1 and
NK2 receptors, significantly inhibited these changes. The thromboxane (Tx)
B2 concentration was increased in
BAL fluid after smoke exposure and was significantly inhibited by
FK-224. OKY-046 (10 mg/kg iv), a Tx synthase inhibitor, significantly
inhibited airway hyperresponsiveness but had no effect on neutrophil
influx or plasma extravasation. The results suggest that neurogenic
inflammation and the subsequent generation of Tx in the airway are
important in the development of the airway hyperresponsiveness induced
by cigarette smoke.
guinea pigs; plasma extravasation; neutrophils
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