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A neurokinin 1-receptor antagonist improves exercise-induced airway narrowing in asthmatic patients.

Authors: Ichinose, M  Miura, M  Yamauchi, H  Kageyama, N  Tomaki, M  Oyake, T  Ohuchi, Y  Hida, W  Miki, H  Tamura, G  Shirato, K 
Citation: Ichinose M, etal., Am J Respir Crit Care Med. 1996 Mar;153(3):936-41.
Pubmed: (View Article at PubMed) PMID:8630576
DOI: Full-text: DOI:10.1164/ajrccm.153.3.8630576

Recent reports suggest the involvement of vascular phenomena in exercise-induced asthma. Sensory neuropeptides, such as substance P (SP), which causes airway vascular dilatation and plasma leakage, have been demonstrated to play a role in hyperpnea-induced airway narrowing in animal studies. The purpose of this study was to investigate the importance of tachykinins in exercise-induced airway narrowing in patients with asthma using a selective neurokinin 1-receptor (NK1-receptor) antagonist, FK-888. In a double-blind, placebo-controlled, crossover trial, nine subjects with stable asthma were given FK-888 (2.5 mg) or placebo by inhalation 20 min before each exercise at a level previously demonstrated to cause a fall of at least 40% in specific airway conduction (SGaw). Inhalation of FK-888 had no significant effect on baseline SGaw. While the recovery from exercise-induced airway narrowing was significantly faster after treatment with FK-888 the area under the curve for SGaw during the 50 min after exercise was significantly reduced (p<0.05) and the time taken for the SGaw to recover to within 65% of baseline after exercise was also significantly shorter with FK-888 than the placebo (p<0.05). However, treatment with FK-888 did not significantly attenuate the maximal fall in SGaw. These results suggest that NK1-receptor-mediated mechanisms are involved in the recovery phase of exercise-induced airway narrowing. The possible mechanisms of these phenomena are discussed.

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CRRD Object Information
CRRD ID: 5147837
Created: 2011-08-23
Species: All species
Last Modified: 2011-08-23
Status: ACTIVE



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