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COX-2 inhibition attenuates cough reflex sensitivity to inhaled capsaicin in patients with asthma.

Authors: Ishiura, Y  Fujimura, M  Yamamoto, H  Ishiguro, T  Ohkura, N  Myou, S 
Citation: Ishiura Y, etal., J Investig Allergol Clin Immunol. 2009;19(5):370-4.
Pubmed: (View Article at PubMed) PMID:19862936

BACKGROUND AND OBJECTIVE: Cyclooxygenase (COX) is an enzyme that converts arachidonic acid to prostanoids. There are two isoforms of COX, namely COX-1 and COX-2. COX-2 is highly inducible by several stimuli and is associated with inflammation. Recent studies have shown that COX-2 is upregulated in the airway epithelium of patients with asthma but little is known about the role it plays in cough, a common symptom of bronchial asthma. This study was designed to investigate the role of COX-2 in cough reflex sensitivity in patients with asthma. PATIENTS AND METHODS: The effect of etodolac, a potent COX-2 inhibitor, on cough response to inhaled capsaicin was examined in 17 patients with stable asthma in a randomized, placebo-controlled crossover study. Capsaicin cough threshold, defined as the lowest concentration of capsaicin eliciting 5 or more coughs, was measured as an index of airway cough reflex sensitivity. RESULTS: The geometric mean (geometric SEM) cough threshold was significantly increased after a 2-week treatment program with oral etodolac (200 mg twice a day) compared with placebo (36.7 [1.2] vs 21.6 [1.2] gM, P<.02). CONCLUSIONS: These findings indicate that COX-2 may be a possible modulator augmenting airway cough reflex sensitivity in asthmatic airways.


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CRRD Object Information
CRRD ID: 5135515
Created: 2011-07-26
Species: All species
Last Modified: 2011-07-26
Status: ACTIVE


RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.