NDLI: Striatal Damage and Oxidative Stress Induced by the Mitochondrial Toxin Malonate Are Reduced in Clorgyline-Treated Rats and MAO-A Deficient Mice

Content Provider	Springer Nature Link
Author	Maragos, William F. Young, Kristie L. Altman, Chris S. Pocernich, Chava B. Drake, Jennifer Butterfield, D. Allan Seif, Isabelle Holschneider, Daniel P. Chen, Kevin Shih, Jean C.
Copyright Year	2004
Abstract	Intrastriatal administration of the succinate dehydrogenase (SDH) inhibitor malonate produces neuronal injury by a “secondary excitotoxic” mechanism involving the generation of reactive oxygen species (ROS). Recent evidence indicates dopamine may contribute to malonate-induced striatal neurodegeneration; infusion of malonate causes a pronounced increase in extracellular dopamine and dopamine deafferentation attenuates malonate toxicity. Inhibition of the catabolic enzyme monoamine oxidase (MAO) also attenuates striatal lesions induced by malonate. In addition to forming 3,4-dihydroxyphenylacetic acid, metabolism of dopamine by MAO generates H$_{2}$O$_{2}$, suggesting that dopamine metabolism may be a source of ROS in malonate toxicity. There are two isoforms of MAO, MAO-A and MAO-B. In this study, we have investigated the role of each isozyme in malonate-induced striatal injury using both pharmacological and genetic approaches. In rats treated with either of the specific MAO-A or -B inhibitors, clorgyline or deprenyl, respectively, malonate lesion volumes were reduced by 30% compared to controls. In knock-out mice lacking the MAO-A isoform, malonate-induced lesions were reduced by 50% and protein carbonyls, an index ROS formation, were reduced by 11%, compared to wild-type animals. In contrast, mice deficient in MAO-B showed highly variable susceptibility to malonate toxicity precluding us from determining the precise role of MAO-B in this form of brain damage. These findings indicate that normal levels of MAO-A participate in expression of malonate toxicity by a mechanism involving oxidative stress.
Starting Page	741
Ending Page	746
Page Count	6
File Format	PDF
ISSN	03643190
Journal	Neurochemical Research
Volume Number	29
Issue Number	4
e-ISSN	15736903
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2004-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Neurosciences Neurology Biochemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Biochemistry Cellular and Molecular Neuroscience

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