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Volume 272, Number 26, Issue of June 27, 1997 pp. 16644-16651
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.

Mice Deficient in Cellular Glutathione Peroxidase Develop Normally and Show No Increased Sensitivity to Hyperoxia

(Received for publication, April 7, 1997, and in revised form, April 30, 1997)

Ye-Shih Ho Dagger , Jean-Luc Magnenat Dagger , Roderick T. Bronson par , Jin Cao Dagger , Mary Gargano Dagger , Masayoshi Sugawara Dagger and Colin D. Funk Dagger Dagger

From the Dagger  Institute of Chemical Toxicology and Department of Biochemistry, Wayne State University, Detroit, Michigan 48201, the par  Department of Pathology, School of Medicine, Tufts University, Boston, Massachusetts 02111, and the Dagger Dagger  Center for Experimental Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104

Glutathione peroxidase, a selenium-containing enzyme, is believed to protect cells from the toxicity of hydroperoxides. The physiological role of this enzyme has previously been implicated mainly using animals fed with a selenium-deficient diet. Although selenium deficiency also affects the activity of several other cellular selenium-containing enzymes, a dramatic decrease of glutathione peroxidase activity has been postulated to play a role in the pathogenesis of a number of diseases, particularly those whose progression is associated with an overproduction of reactive oxygen species, found in selenium-deficient animals. To further clarify the physiological relevance of this enzyme, a model of mice deficient in cellular glutathione peroxidase (GSHPx-1), the major isoform of glutathione peroxidase ubiquitously expressed in all types of cells, was generated by gene-targeting technology. Mice deficient in this enzyme were apparently healthy and fertile and showed no increased sensitivity to hyperoxia. Their tissues exhibited neither a retarded rate in consuming extracellular hydrogen peroxide nor an increased content of protein carbonyl groups and lipid peroxidation compared with those of wild-type mice. However, platelets from GSHPx-1-deficient mice incubated with arachidonic acid generated less 12-hydroxyeicosatetraenoic acid and more polar products relative to control platelets at a higher concentration of arachidonic acid, presumably reflecting a decreased ability to reduce the 12-hydroperoxyeicosatetraenoic acid intermediate. These results suggest that the contribution of GSHPx-1 to the cellular antioxidant mechanism under normal animal development and physiological conditions and to the pulmonary defense against hyperoxic insult is very limited. Nevertheless, the potential antioxidant role of this enzyme in protecting cells and animals against the pathogenic effect of reactive oxygen species in other disorders remains to be defined. The knockout mouse model described in this report will also provide a new tool for future study to distinguish the physiological role of this enzyme from other selenium-containing proteins in mammals under normal and disease states.


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Physiol. Rev.Home page
K. B. BECKMAN and B. N. AMES
The Free Radical Theory of Aging Matures
Physiol Rev, April 1, 1998; 78(2): 547 - 581.
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Proc. Natl. Acad. Sci. USAHome page
E. N. Johnson, L. F. Brass, and C. D. Funk
Increased platelet sensitivity to ADP in mice lacking platelet-type 12-lipoxygenase
PNAS, March 17, 1998; 95(6): 3100 - 3105.
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Proc. Natl. Acad. Sci. USAHome page
J. H. Beattie, A. M. Wood, A. M. Newman, I. Bremner, K. H. A. Choo, A. E. Michalska, J. S. Duncan, and P. Trayhurn
Obesity and hyperleptinemia in metallothionein (-I and -II) null mice
PNAS, January 6, 1998; 95(1): 358 - 363.
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Am. J. Physiol. Heart Circ. Physiol.Home page
M. A. Forgione, N. Weiss, S. Heydrick, A. Cap, E. S. Klings, C. Bierl, R. T. Eberhardt, H. W. Farber, and J. Loscalzo
Cellular glutathione peroxidase deficiency and endothelial dysfunction
Am J Physiol Heart Circ Physiol, April 1, 2002; 282(4): H1255 - H1261.
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