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Am J Physiol Lung Cell Mol Physiol 273: L1112-L1117, 1997;
1040-0605/97 $5.00
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AJP - Lung Cellular and Molecular Physiology, Vol 273, Issue 6 1112-L1117, Copyright © 1997 by American Physiological Society

ARTICLES

Anoxia-reoxygenation versus ischemia in isolated rat lungs

G. Zhao, A. B. al-Mehdi and A. B. Fisher
Institute for Environmental Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.

Oxidant generation in anoxia-reoxygenation and ischemia-reperfusion was compared in isolated rat lungs. Anoxia-reoxygenation was produced by N2 ventilation followed by O2 ventilation. After anoxia, lung ATP content was decreased by 59%. Oxygenated ischemia was produced by discontinuing perfusion while ventilation with O2 was maintained. With anoxia-reoxygenation, oxidant generation, evaluated by oxidation of dichlorodihydrofluorescein (H2DCF) to fluorescent dichlorofluorescein, increased 3.6-fold, lung thiobarbituric acid reactive substances (TBARS) increased 342%, conjugated dienes increased 285%, and protein carbonyl content increased 46%. Pretreatment of lungs with 100 microM allopurinol inhibited the reoxygenation-mediated increase in lung fluorescence by 75% and TBARS by 69%. Oxygenated ischemia resulted in an approximately eightfold increase in lung H2DCF oxidation and a fourfold increase in TBARS, but allopurinol had no effect. On the other hand, 100 microM diphenyliodonium (DPI) inhibited the ischemia-mediated increase in lung fluorescence by 69% and lung TBARS by 70%, but it had no effect on the increase with anoxia-reoxygenation. Therefore, both ischemia-reperfusion and anoxia-reoxygenation result in oxidant generation by the lung, but a comparison of results with a xanthine oxidase inhibitor (allopurinol) and a flavoprotein inhibitor (DPI) indicate that the pathways for oxidant generation are distinctly different.


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