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Title: Effect of 2 ppm ozone exposure on rat lung lipid fatty acids

Abstract

Based on in vitro studies, the initial damage to lung cells by ozone exposure is believed to result in part from the breakdown of lipid polyunsaturated fatty acids to aldehydes, ozonides, and peroxides. The present study measured lipid breakdown products in lungs isolated from rats pretreated with (1-/sup 14/C)acetate 12 h before exposure for 4 h to either air or 2 ppm ozone. Lipid fatty acid breakdown was indicated by a 112% increase in thiobarbituric acid-reactive substances on ozone exposure and by changes in chemical and radioactive measurements of mono- and dicarboxylic acids formed by treatment of lipid fractions with hydrogen peroxide. Ozone exposure resulted in a 63% increase in recovery of short-chain fatty acids accounted for by increased recoveries of malonic acid by 37%, hexanoic acid by 47%, nonanoic acid by 118%, and azelaic acid by 107%. Recovery of glutaric acid was enhanced 15-fold by ozone exposure. Although decreases in tissue arachidonic acid could not be detected, oleic acid was significantly decreased by 36%. Recovery of radiolabel as short-chain fatty acids was increased by 65% on ozone exposure and was mainly accounted for by enhanced labeling of nonanoic and glutaric acid fractions. The failure to observe significant increases inmore » /sup 14/C recovery in the other fractions suggested ozone-induced breakdown of unlabeled fatty acids. These results demonstrate the cleavage of unsaturated fatty acid double bonds following in vivo exposure of lungs to ozone. Breakdown of arachidonic and oleic acids was specifically identified by increased recoveries of glutaric and nonanoic acids, respectively.« less

Authors:
;
Publication Date:
Research Org.:
Univ. of Pennsylvania, Philadelphia (USA)
OSTI Identifier:
6495789
Resource Type:
Journal Article
Resource Relation:
Journal Name: Exp. Lung Res.; (United States); Journal Volume: 14:4
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 59 BASIC BIOLOGICAL SCIENCES; CARBOXYLIC ACIDS; METABOLISM; OZONE; TOXICITY; ACETATES; CARBON 14 COMPOUNDS; HYDROGEN PEROXIDE; LUNGS; RATS; TRACER TECHNIQUES; ANIMALS; BODY; CARBOXYLIC ACID SALTS; HYDROGEN COMPOUNDS; ISOTOPE APPLICATIONS; LABELLED COMPOUNDS; MAMMALS; ORGANIC ACIDS; ORGANIC COMPOUNDS; ORGANS; OXYGEN COMPOUNDS; PEROXIDES; RESPIRATORY SYSTEM; RODENTS; VERTEBRATES; 560300* - Chemicals Metabolism & Toxicology; 550501 - Metabolism- Tracer Techniques

Citation Formats

Rabinowitz, J.L., and Bassett, D.J.. Effect of 2 ppm ozone exposure on rat lung lipid fatty acids. United States: N. p., 1988. Web. doi:10.3109/01902148809087822.
Rabinowitz, J.L., & Bassett, D.J.. Effect of 2 ppm ozone exposure on rat lung lipid fatty acids. United States. doi:10.3109/01902148809087822.
Rabinowitz, J.L., and Bassett, D.J.. Fri . "Effect of 2 ppm ozone exposure on rat lung lipid fatty acids". United States. doi:10.3109/01902148809087822.
@article{osti_6495789,
title = {Effect of 2 ppm ozone exposure on rat lung lipid fatty acids},
author = {Rabinowitz, J.L. and Bassett, D.J.},
abstractNote = {Based on in vitro studies, the initial damage to lung cells by ozone exposure is believed to result in part from the breakdown of lipid polyunsaturated fatty acids to aldehydes, ozonides, and peroxides. The present study measured lipid breakdown products in lungs isolated from rats pretreated with (1-/sup 14/C)acetate 12 h before exposure for 4 h to either air or 2 ppm ozone. Lipid fatty acid breakdown was indicated by a 112% increase in thiobarbituric acid-reactive substances on ozone exposure and by changes in chemical and radioactive measurements of mono- and dicarboxylic acids formed by treatment of lipid fractions with hydrogen peroxide. Ozone exposure resulted in a 63% increase in recovery of short-chain fatty acids accounted for by increased recoveries of malonic acid by 37%, hexanoic acid by 47%, nonanoic acid by 118%, and azelaic acid by 107%. Recovery of glutaric acid was enhanced 15-fold by ozone exposure. Although decreases in tissue arachidonic acid could not be detected, oleic acid was significantly decreased by 36%. Recovery of radiolabel as short-chain fatty acids was increased by 65% on ozone exposure and was mainly accounted for by enhanced labeling of nonanoic and glutaric acid fractions. The failure to observe significant increases in /sup 14/C recovery in the other fractions suggested ozone-induced breakdown of unlabeled fatty acids. These results demonstrate the cleavage of unsaturated fatty acid double bonds following in vivo exposure of lungs to ozone. Breakdown of arachidonic and oleic acids was specifically identified by increased recoveries of glutaric and nonanoic acids, respectively.},
doi = {10.3109/01902148809087822},
journal = {Exp. Lung Res.; (United States)},
number = ,
volume = 14:4,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 1988},
month = {Fri Jan 01 00:00:00 EST 1988}
}