Document Detail


Persistent rhinitis and epithelial remodeling induced by cyclic ozone exposure in the nasal airways of infant monkeys.
MedLine Citation:
PMID:  21131400     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Children chronically exposed to high levels of ozone (O(3)), the principal oxidant pollutant in photochemical smog, are more vulnerable to respiratory illness and infections. The specific factors underlying this differential susceptibility are unknown but may be related to air pollutant-induced nasal alterations during postnatal development that impair the normal physiological functions (e.g., filtration and mucociliary clearance) serving to protect the more distal airways from inhaled xenobiotics. In adult animal models, chronic ozone exposure is associated with adaptations leading to a decrease in airway injury. The purpose of our study was to determine whether cyclic ozone exposure induces persistent morphological and biochemical effects on the developing nasal airways of infant monkeys early in life. Infant (180-day-old) rhesus macaques were exposed to 5 consecutive days of O(3) [0.5 parts per million (ppm), 8 h/day; "1-cycle"] or filtered air (FA) or 11 biweekly cycles of O(3) (FA days 1-9; 0.5 ppm, 8 h/day on days 10-14; "11-cycle"). The left nasal passage was processed for light microscopy and morphometric analysis. Mucosal samples from the right nasal passage were processed for GSH, GSSG, ascorbate (AH(2)), and uric acid (UA) concentration. Eleven-cycle O(3) induced persistent rhinitis, squamous metaplasia, and epithelial hyperplasia in the anterior nasal airways of infant monkeys, resulting in a 39% increase in the numeric density of epithelial cells. Eleven-cycle O(3) also induced a 65% increase in GSH concentrations at this site. The persistence of epithelial hyperplasia was positively correlated with changes in GSH. These results indicate that early life ozone exposure causes persistent nasal epithelial alterations in infant monkeys and provide a potential mechanism for the increased susceptibility to respiratory illness exhibited by children in polluted environments.
Authors:
Stephan A Carey; Carol A Ballinger; Charles G Plopper; Ruth J McDonald; Alfred A Bartolucci; Edward M Postlethwait; Jack R Harkema
Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2010-12-03
Journal Detail:
Title:  American journal of physiology. Lung cellular and molecular physiology     Volume:  300     ISSN:  1522-1504     ISO Abbreviation:  Am. J. Physiol. Lung Cell Mol. Physiol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-02-02     Completed Date:  2011-03-14     Revised Date:  2013-07-03    
Medline Journal Info:
Nlm Unique ID:  100901229     Medline TA:  Am J Physiol Lung Cell Mol Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  L242-54     Citation Subset:  IM    
Affiliation:
Department of Small Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, 48824, USA. careys@msu.edu
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / toxicity*
Animals
Antioxidants / metabolism
Child
Disease Models, Animal
Gene Expression / drug effects
Glutamate-Cysteine Ligase / genetics
Glutathione / metabolism
Humans
Macaca mulatta
Male
Metaplasia / pathology
Nasal Mucosa / drug effects*,  metabolism,  pathology*
Neutrophils / pathology
Ozone / administration & dosage,  toxicity*
RNA, Messenger / genetics,  metabolism
Rhinitis / chemically induced*,  genetics,  metabolism,  pathology*
Grant Support
ID/Acronym/Agency:
P01 ES011617/ES/NIEHS NIH HHS; P01-ES-011617/ES/NIEHS NIH HHS
Chemical
Reg. No./Substance:
0/Air Pollutants; 0/Antioxidants; 0/RNA, Messenger; 10028-15-6/Ozone; 70-18-8/Glutathione; EC 6.3.2.2/Glutamate-Cysteine Ligase
Comments/Corrections

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


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