Document Detail


Antioxidant consumption and repletion kinetics in nasal lavage fluid following exposure of healthy human volunteers to ozone.
MedLine Citation:
PMID:  10445623     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To obtain information on the real-time events occurring within human respiratory tract lining fluids (RTLFs) during ozone exposure, sequential nasal lavage was performed on 13 human volunteers exposed on separate occasions to 0.2 parts per million O3 and filtered air (2-h exposures, with intermittent exercise). Nasal lavage was performed and blood samples obtained at four time points throughout each exposure: pre-exposure (Pre-E), 1 h into exposure (1h-E), immediately post-exposure (0h-PE) and 1 h post-exposure (1h-PE). Endobronchial mucosal biopsies were obtained at 1.5 h-post exposure (1.5h-PE). Nasal RTLF neutrophilia was not apparent during, or 1.5 h after, 03 exposure. Furthermore, activation of the pre-existing neutrophil population did not occur. Airway permeability was not altered by this 03 exposure regimen. Sequential lavage resulted in significant washout of RTLF ascorbic acid, reduced glutathione, extracellular superoxide dismutase and myeloperoxidase at 1h-E, 0h-PE and 1.5h-PE relative to baseline Pre-E values. In contrast, RTLF uric acid (UA), total protein and albumin concentrations did not display washout kinetics. Of the antioxidants examined, only UA was clearly depleted by 03, concentrations, falling by 6.22 micromol x L(-1) at 1h-E, compared with 1.61 micromol x L(-1) (p<0.01) during control air exposure. The establishment of a new pseudo-steady-state concentration of RTLF UA (70% of Pre-E values) during the second hour of O3 exposure was coincident with a small but significant increase in plasma UA concentration (19.27 (O3) versus 1.95 micromol x L(-1) (air), p<0.05). These data demonstrate that inhalation of 0.2 parts per million 03 results in the depletion of nasal respiratory tract lining fluid uric acid and that this regional loss of uric acid leads to a small increase in plasma uric acid concentration. Whilst the reaction of uric acid with inspired 03 may confer protection locally, the role of upper airway uric acid as a sink for inhaled O3 is not supported by these findings.
Authors:
I S Mudway; A Blomberg; A J Frew; S T Holgate; T Sandström; F J Kelly
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Publication Detail:
Type:  Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The European respiratory journal     Volume:  13     ISSN:  0903-1936     ISO Abbreviation:  Eur. Respir. J.     Publication Date:  1999 Jun 
Date Detail:
Created Date:  1999-09-17     Completed Date:  1999-09-17     Revised Date:  2013-05-23    
Medline Journal Info:
Nlm Unique ID:  8803460     Medline TA:  Eur Respir J     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  1429-38     Citation Subset:  IM    
Affiliation:
Lung Biology, Cardiovascular Research, The Rayne Institute, St Thomas' Hospital, London, UK.
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MeSH Terms
Descriptor/Qualifier:
Adult
Albumins / analysis
Antioxidants / metabolism*
Ascorbic Acid / analysis
Biopsy
Bronchi / metabolism,  pathology
Cross-Over Studies
Female
Glutathione / analysis
Humans
Male
Mucous Membrane / pathology
Nasal Lavage Fluid / chemistry*,  cytology
Oxidants, Photochemical / pharmacology*
Oxidative Stress
Ozone / pharmacology*
Peroxidase / analysis
Proteins / analysis
Single-Blind Method
Superoxide Dismutase / analysis
Uric Acid / metabolism
Chemical
Reg. No./Substance:
0/Albumins; 0/Antioxidants; 0/Oxidants, Photochemical; 0/Proteins; 10028-15-6/Ozone; 50-81-7/Ascorbic Acid; 69-93-2/Uric Acid; 70-18-8/Glutathione; EC 1.11.1.7/Peroxidase; EC 1.15.1.1/Superoxide Dismutase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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