Document Detail

Differential depletion of human respiratory tract antioxidants in response to ozone challenge.
MedLine Citation:
PMID:  8951423     Owner:  NLM     Status:  MEDLINE    
The toxicity of ozone, the major component of photochemical smog, is related to its powerful oxidising ability, and many of its deleterious effects are mediated through free radical reactions. As the majority of ozone oxidation events are thought to be confined to the pulmonary epithelial lining fluid, we studied the interaction of ozone with a range of small molecular weight antioxidants found within this compartment: ascorbic acid (AH2), uric acid (UA), and reduced glutathione (GSH). Epithelial lining fluid obtained as bronchoalveolar lavage (BAL) fluid, was taken from 16 male subjects and the antioxidant concentrations determined for each subject. BAL fluid samples from nine of these subjects were then exposed, using an interfacial exposure system, to a range (50-1000 ppb) of ozone concentrations. Both AH2 and UA were consumed by ozone in a time and ozone concentration dependent manner, with mean consumption rates of 1.7 +/- 0.8 and 1.0 +/- 0.5 pmol L-1 s-1 ppb-1, respectively. Considerable intersubject variation was however observed. The individual rates of consumption for each antioxidant were significantly correlated with the respective initial antioxidant concentration. In contrast, although GSH was consumed at 50 ppb ozone, the rate of consumption did not change with increasing ozone concentration. We conclude that there is differential depletion of BAL fluid antioxidants, suggesting a reactivity hierarchy toward ozone in human ELF of AH2 > UA > > GSH.
I S Mudway; D Housley; R Eccles; R J Richards; A K Datta; T D Tetley; F J Kelly
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Free radical research     Volume:  25     ISSN:  1071-5762     ISO Abbreviation:  Free Radic. Res.     Publication Date:  1996 Dec 
Date Detail:
Created Date:  1997-02-28     Completed Date:  1997-02-28     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9423872     Medline TA:  Free Radic Res     Country:  SWITZERLAND    
Other Details:
Languages:  eng     Pagination:  499-513     Citation Subset:  IM    
Rayne Institute, St Thomas' Hospital, London.
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MeSH Terms
Antioxidants / metabolism*
Ascorbic Acid / metabolism
Bronchoalveolar Lavage Fluid / chemistry*,  cytology
Epithelium / drug effects,  metabolism
Glutathione / metabolism
Oxidants, Photochemical / toxicity*
Ozone / toxicity*
Uric Acid / metabolism
Reg. No./Substance:
0/Antioxidants; 0/Oxidants, Photochemical; 10028-15-6/Ozone; 50-81-7/Ascorbic Acid; 69-93-2/Uric Acid; 70-18-8/Glutathione

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

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