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Cytochrome P-450 mediates tissue-damaging hydroxyl radical formation during reoxygenation of the kidney.

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Cytochrome P-450 mediates tissue-damaging hydroxyl radical formation during reoxygenation of the kidney.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Paller, M. S. Jacob, H. S.
Description	Author Affiliation: Paller MS ( Department of Medicine, University of Minnesota, Minneapolis 55455.);
Abstract	Renal reperfusion injury results from oxygen radical generation. During reoxygenation of hypoxic kidney cells, xanthine oxidase produces superoxide radical, which eventuates in hydroxyl radical formation by the Fenton reaction. This reaction, catalyzed by transition metals such as iron, is particularly important because hydroxyl radical is highly reactive with a wide variety of biomolecules. We tested the hypothesis that this catalytic function is fostered by iron released from the heme moiety of cytochrome P-450. Primary cultures of rat proximal tubule epithelial cells studied in a subconfluent stage were subjected to 60 min of hypoxia and 30 min of reoxygenation. When cells were pretreated with one of three cytochrome P-450 inhibitors (piperonyl butoxide, cimetidine, or ketoconazole), lethal cell injury was attenuated. There was the expected increase in O2-. production during hypoxia/reoxygenation that cytochrome P-450 inhibitors did not prevent; on the other hand, inhibitors did prevent reoxygenation-induced hydroxyl radical formation. Analogously, the increase in catalytic iron (bleomycin-detectable iron) that accompanies hypoxia/reoxygenation did not occur in the presence of cytochrome P-450 inhibitors. In vivo studies confirmed a protective effect of cytochrome P-450 inhibition because glomerular filtration rate was better preserved in rats pretreated with cimetidine and then subjected to renal artery occlusion. In summary, several chemically distinct cytochrome P-450 inhibitors reduced iron release, and thereby, hydroxyl radical formation and reoxygenation-induced lethal cell injury, without inhibiting superoxide radical formation. We conclude that highly labile P-450 may act as an Fe-donating catalyst for Fenton reaction production of HO.-mediated reperfusion injury.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	15
Volume Number	91
Language	English
Publisher	National Academy of Sciences
Publisher Date	1994-08-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Cytochrome P-450 Enzyme System Metabolism Hydroxyl Radical Kidney Tubules, Proximal Oxygen Reperfusion Injury Animals Catalysis Cells, Cultured Cytochrome P-450 Enzyme Inhibitors Free Radicals Ischemia Enzymology Pathology Rats, Sprague-Dawley Superoxides Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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