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The Journal of Neuroscience, January 1, 2000, 20(1):1-7
Mice Deficient in Cellular Glutathione Peroxidase Show Increased
Vulnerability to Malonate, 3-Nitropropionic Acid, and
1-Methyl-4-Phenyl-1,2,5,6-Tetrahydropyridine
Peter
Klivenyi1,
Ole A.
Andreassen1,
Robert J.
Ferrante2,
Alpaslan
Dedeoglu2,
Gerald
Mueller1,
Eric
Lancelot1,
Mikhail
Bogdanov1,
Julie K.
Andersen3,
Dongmei
Jiang3, and
M. Flint
Beal1, 4
1 Neurology Service, Massachusetts General Hospital and
Harvard Medical School, Boston, Massachusetts,
2 Departments of Neurology, Pathology, and Psychiatry,
Boston University School of Medicine, Boston, Massachusetts, and the
Department of Veterans Affairs, Bedford, Massachusetts,
3 Department of Gerontology, University of Southern
California, Los Angeles, California, and 4 Department of
Neurology and Neuroscience, Weill Medical College of Cornell
University, New York, New York 10021
Glutathione peroxidase (GSHPx) is a critical intracellular enzyme
involved in detoxification of hydrogen peroxide
(H2O2) to water. In the present study we
examined the susceptibility of mice with a disruption of the
glutathione peroxidase gene to the neurotoxic effects of malonate,
3-nitropropionic acid (3-NP), and
1-methyl-4-phenyl-1,2,5,6-tetrahydropyridine (MPTP). Glutathione peroxidase knock-out mice showed no evidence of neuropathological or
behavioral abnormalities at 2-3 months of age. Intrastriatal injections of malonate resulted in a significant twofold increase in
lesion volume in homozygote GSHPx knock-out mice as compared to both
heterozygote GSHPx knock-out and wild-type control mice. Malonate-induced increases in conversion of salicylate to 2,3- and
2,5-dihydroxybenzoic acid, an index of hydroxyl radical generation, were greater in homozygote GSHPx knock-out mice as compared with both
heterozygote GSHPx knock-out and wild-type control mice. Administration
of MPTP resulted in significantly greater depletions of dopamine,
3,4-dihydroxybenzoic acid, and homovanillic acid in GSHPx
knock-out mice than those seen in wild-type control mice. Striatal
3-nitrotyrosine (3-NT) concentrations after MPTP were significantly
increased in GSHPx knock-out mice as compared with wild-type control
mice. Systemic 3-NP administration resulted in significantly greater
striatal damage and increases in 3-NT in GSHPx knock-out mice as
compared to wild-type control mice. The present results indicate that a
knock-out of GSHPx may be adequately compensated under nonstressed
conditions, but that after administration of mitochondrial toxins GSHPx
plays an important role in detoxifying increases in oxygen radicals.
Key words:
MPTP; 3-nitropropionic acid; malonate; oxidative damage; free radicals; glutathione; Parkinson's; Huntington's
Copyright © 2000 Society for Neuroscience 0270-6474/0/2011-07$05.00/0
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