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Effect of nitric oxide inhibition on nasal airway resistance after nasal allergen challenge in allergic rhinitis

Effect of nitric oxide inhibition on nasal airway resistance after nasal allergen challenge in... Background Nitric oxide has been detected by chemiluminescence in the lumen of nasal airway, which is increased in nasal breathing in patients with seasonal rhinitis during a chronic exposure. The purpose of this study was to determinate the effect of a NO‐synthase inhibitor NGL‐arginine methyl ester (L‐NAME) on nasal airway resistance (NAR) in patients with seasonal allergic rhinitis after an acute challenge to the allergen. Methods Nitric oxide levels in the nose were measured by the chemiluminescence method in nine non‐atopic volunteers and in seven patients with seasonal rhinitis at rest and after an acute challenge with the allergen. NAR were measured by active anterior rhinomanometry. Results Basal nasal NO concentration in allergic rhinitis was 496·5 ± 151·4 parts per billion (ppb). (n = 7) and it was not significantly different from levels found in the control group: 458·4 ± 105·9 ppb (n = 9). The topical administration of L‐NAME in allergic rhinitis reduced the NO concentration (338·6 ± 99·3 ppb, P < 0·001; n = 7). In the rhinitic patients the challenge with the allergen did not modify the nasal NO levels (504·5 ± 138·5 ppb). The application of the allergen after the pretreatment with placebo caused a significant increase in NAR (from 0·32 ± 0·11 Pa s cm−3 to 1·01 ± 0·12 Pa s cm−3, P < 0·001; n = 7). Pre‐treatment with L‐NAME did not prevent the increase in NAR induced by allergen challenge (from 0·36 ± 0·15 Pa s cm−3 to 1·06 ± 0·26 Pa s cm−3). Conclusions The results indicate that nasal administration of a NOS inhibitor L‐NAME, at doses capable of decreasing nasal NO levels, has no effect on NAR and it does not prevent the NAR increase induced by an acute challenge with allergen in subjects with seasonal rhinitis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png European Journal of Clinical Investigation Wiley

Effect of nitric oxide inhibition on nasal airway resistance after nasal allergen challenge in allergic rhinitis

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References (21)

Publisher
Wiley
Copyright
Copyright © 2001 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0014-2972
eISSN
1365-2362
DOI
10.1046/j.1365-2362.2001.00825.x
Publisher site
See Article on Publisher Site

Abstract

Background Nitric oxide has been detected by chemiluminescence in the lumen of nasal airway, which is increased in nasal breathing in patients with seasonal rhinitis during a chronic exposure. The purpose of this study was to determinate the effect of a NO‐synthase inhibitor NGL‐arginine methyl ester (L‐NAME) on nasal airway resistance (NAR) in patients with seasonal allergic rhinitis after an acute challenge to the allergen. Methods Nitric oxide levels in the nose were measured by the chemiluminescence method in nine non‐atopic volunteers and in seven patients with seasonal rhinitis at rest and after an acute challenge with the allergen. NAR were measured by active anterior rhinomanometry. Results Basal nasal NO concentration in allergic rhinitis was 496·5 ± 151·4 parts per billion (ppb). (n = 7) and it was not significantly different from levels found in the control group: 458·4 ± 105·9 ppb (n = 9). The topical administration of L‐NAME in allergic rhinitis reduced the NO concentration (338·6 ± 99·3 ppb, P < 0·001; n = 7). In the rhinitic patients the challenge with the allergen did not modify the nasal NO levels (504·5 ± 138·5 ppb). The application of the allergen after the pretreatment with placebo caused a significant increase in NAR (from 0·32 ± 0·11 Pa s cm−3 to 1·01 ± 0·12 Pa s cm−3, P < 0·001; n = 7). Pre‐treatment with L‐NAME did not prevent the increase in NAR induced by allergen challenge (from 0·36 ± 0·15 Pa s cm−3 to 1·06 ± 0·26 Pa s cm−3). Conclusions The results indicate that nasal administration of a NOS inhibitor L‐NAME, at doses capable of decreasing nasal NO levels, has no effect on NAR and it does not prevent the NAR increase induced by an acute challenge with allergen in subjects with seasonal rhinitis.

Journal

European Journal of Clinical InvestigationWiley

Published: May 1, 2001

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