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Spirometry Nitric Oxide Exchange in a Pattern Distinct Exercise-induced bronchoconstriction alters airway nitric oxide exchange in a pattern distinct from spirometry Hye-Won Shin, Christina D. Schwindt, Anna S. Aledia, Christine M. Rose-Gottron, Jennifer K. Larson, Robert L. Newcomb, Dan M. Cooper and Steven C. George Am J Physiol Regulatory Integrative Comp Physiol 291:1741-1748, 2006. First published Jul 13, 2006; doi:10.1152/ajpregu.00178.2006 You might find this additional information useful... This article cites 57 articles, 35 of which you can access free at: http://ajpregu.physiology.org/cgi/content/full/291/6/R1741#BIBL Updated information and services including high-resolution figures, can be found at: http://ajpregu.physiology.org/cgi/content/full/291/6/R1741 Additional material and information about American Journal of Physiology - Regulatory, Integrative Downloaded from and Comparative Physiology can be found at: http://www.the-aps.org/publications/ajpregu This information is current as of November 29, 2006 . ajpregu.physiology.org on November 29, 2006 The American Journal of Physiology - Regulatory, Integrative and Comparative Physiology publishes original investigations that illuminate normal or abnormal regulation and integration of physiological mechanisms at all levels of biological organization, ranging from molecules to humans, including clinical investigations. It is published 12 times a year (monthly) by the American Physiological Society, 9650 Rockville Pike, Bethesda MD 20814-3991. Copyright © 2005 by the American Physiological Society. ISSN: 0363-6119, ESSN: 1522-1490. Visit our website at http://www.the-aps.org/. Am J Physiol Regul Integr Comp Physiol 291: R1741–R1748, 2006. First published July 13, 2006; doi:10.1152/ajpregu.00178.2006. Exercise-induced bronchoconstriction alters airway nitric oxide exchange in a pattern distinct from spirometry Hye-Won Shin,1 Christina D. Schwindt,3,4 Anna S. Aledia,1,6 Christine M. Rose-Gottron,4 Jennifer K. Larson,3,4 Robert L. Newcomb,4,5 Dan M. Cooper,1,3,4 and Steven C. George1,2 1Department of Biomedical Engineering, 2Department of Chemical Engineering and Materials Science, 3Department of Pediatrics, 4General Clinical Research Center, 5Center for Statistical Consulting, and 6Department of Medicine, Division of Pulmonary and Critical Care, University of California, Irvine, California Submitted 14 March 2006; accepted in final form 6 July 2006 Shin, Hye-Won, Christina D. Schwindt, Anna S. Aledia, pathogenesis of both exercise-induced (EIB) and thermally-in- Christine M. Rose-Gottron, Jennifer K. Larson, Robert L. duced bronchoconstriction (9, 21–23, 27, 38, 50). Newcomb, Dan M. Cooper, and Steven C. George. Exercise- EIB is thought to be triggered by increased heat and water induced bronchoconstriction alters airway nitric oxide exchange in losses from the airways during exercise (31), leading to airway a pattern distinct from spirometry. Am J Physiol Regul Integr inflammation and bronchoconstriction. However, even well- Downloaded from Comp Physiol 291: R1741–R1748, 2006. First published July 13, controlled steroid-treated asthmatics can experience EIB (4). 2006; doi:10.1152/ajpregu.00178.2006.—Exhaled nitric oxide Furthermore, baseline spirometry (forced expiratory volume in (NO) is altered in asthmatic subjects with exercise-induced bron- choconstriction (EIB). However, the physiological interpretation 1s,FEV1) cannot predict the presence of EIB (19), and CENO of exhaled NO is limited because of its dependence on exhalation is elevated at baseline in asthmatics independent of the pres- flow and the inability to distinguish completely proximal (large ence of EIB (7). Thus a complete physiological understanding airway) from peripheral (small airway and alveolar) contributions. of alterations in spirometry and CENO observed in EIB remains We estimated flow-independent NO exchange parameters that unknown. ajpregu.physiology.org partition exhaled NO into proximal and peripheral contributions at There is a growing body of evidence that suggests CENO has baseline, postexercise challenge, and postbronchodilator adminis- both a proximal (i.e., large airway) and peripheral (i.e., small tration in steroid-naive mild-intermittent asthmatic subjects with airway and alveolar) contribution (18, 28, 35, 44, 52). This EIB (24–43 yr old, n ϭ 9) and healthy controls (20–31 yr old, n ϭ contrasts sharply with other endogenously produced gases, 9). The mean Ϯ SD maximum airway wall flux and airway such as carbon dioxide, which are excreted mainly in the diffusing capacity were elevated and forced expiratory flow, mi- alveolar region of the lungs. In healthy adults, Ͼ50% of CENO dexpiratory phase (FEF25–75), forced expiratory volume in 1 s arises from the large airways (lobar bronchi and larger) (10, (FEV1), and FEV1/forced vital capacity (FVC) were reduced at 43). It has been postulated that the elevated CENO observed in on November 29, 2006 baseline in subjects with EIB compared with healthy controls, asthma is due to an upregulation of one or more of the nitric whereas the steady-state alveolar concentration of NO and FVC were not different. Compared with the response of healthy con- oxide (NO) synthase (NOS) isoforms [inducible NOS, endo- trols, exercise challenge significantly reduced FEV (Ϫ23 Ϯ 15%), thelial NOS, or neuronal NOS (1, 15, 17, 47, 55, 57)] and a 1 peripheral extension of NO-producing cells in the airways (44). FEF25–75 (Ϫ37 Ϯ 18%), FVC (Ϫ12 Ϯ 12%), FEV1/FVC (Ϫ13 Ϯ 8%), and maximum airway wall flux (Ϫ35 Ϯ 11%) relative to Thus our limited understanding of the role of NO in EIB is due, baseline in subjects with EIB, whereas bronchodilator administra- in part, to the fact that CENO cannot distinguish proximal and tion only increased FEV1 (ϩ20 Ϯ 21%), FEF25–75 (ϩ56 Ϯ 41%), more peripheral contributions. and FEV1/FVC (ϩ13 Ϯ 9%). We conclude that mild-intermittent Our group has previously described a two-compartment (air- steroid-naive asthmatic subjects with EIB have altered airway NO way and alveolar regions) model of NO exchange (52) and a exchange dynamics at baseline and after exercise challenge but that single-breath technique (53) to estimate flow-independent NO these changes occur by distinct mechanisms and are not correlated exchange parameters: global maximum airway flux of NO with alterations in spirometry. (JЈawNO), global airway diffusing capacity (DawNO), airway wall asthma; model; inflammation concentration of NO (CawNO), and steady-state alveolar concen- tration of NO (CANO) (14). The flow-independent NO exchange parameters can partition CENO into proximal (JЈawNO, DawNO, NITRIC OXIDE (NO) appears in the exhaled breath and performs and CawNO) and peripheral (CANO) contributions and thus poten- many functions in the lungs such as smooth muscle relaxation, tially provide insight into the mechanisms of NO exchange in host defense, inhibition of platelet aggregation, and neurotrans- EIB. The goal of the present study was to 1) characterize regional mission. Much research effort has focused on utilizing the con- (proximal and peripheral) NO exchange dynamics in steroid-naive centration of NO in the exhaled breath at a constant exhalation mild asthmatic subjects with EIB at baseline, after exercise chal- flow (CENO) as a noninvasive marker of inflammation in diseases lenge, and after bronchodilator administration, and 2) determine such as asthma (2, 5). Changes in CENO during and after exercise whether dynamic changes in NO exchange are correlated with have been reported (6, 8, 20, 29, 30, 33, 51), and more recently, standard indexes of spirometry. alterations in CENO have been reported to play a role in the The costs of publication of this article were defrayed in part by the Address for reprint requests and other correspondence: S. C. George, Dept. payment of page charges. The article must therefore be hereby marked of Biomedical Engineering, 3120 Natural Sciences II, Univ. of California, “advertisement” in accordance with 18 U.S.C. Section 1734 solely to Irvine, CA 92697-2715 (e-mail: [email protected]). indicate this fact. http://www.ajpregu.org 0363-6119/06 $8.00 Copyright © 2006 the American Physiological Society R1741 R1742 EXERCISE-INDUCED BRONCHOCONSTRICTION AND EXHALED NO METHODS albuterol sulfate. Five of the nine subjects with EIB participated in a second control visit in which the exercise period was replaced with a Glossary rest period to determine whether spirometry impacted the NO ex- change dynamics (24, 45, 49). AI,II Area under the curve in phases I and II of exhaled NO profile (ppb⅐ml) Exhaled NO Measurement CANO Mixed or average fractional concentration of NO in gas A chemiluminescence NO analyzer (Sievers, Boulder, CO) and phase of alveolar region (ppb; a steady-state concen- pneumotachometer (Hans Rudolph, Kansas City, MO) were used to tration is achieved for breathhold or exhalation times Ͼ record NO, pressure, and flow for five repetitions in each subject of a 10 s) 20-s preexpiratory breathhold followed by a decreasing exhalation CawNO Airway wall concentration of NO (ppb) flow maneuver (41, 53). The profiles were characterized by the peak CENO,i Exhaled NO concentration at the mouth at constant concentration in phases I and II, CpeakNO, the volume (or width) of exhalation flow i (ppb) phases I and II, W50, and the total mass of NO, AI,II (Fig. 1). In CobsNO Exhaled NO concentration (ppb) observed by analytical addition, with a two-compartment model (14, 52), the profiles were instrument used to determine the flow-independent NO exchange parameters CpeakNO Maximum or peak exhaled NO concentration (ppb)
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