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The Journal of Neuroscience, April 15, 2003, 23(8):3394
Coordinate Regulation of Glutathione Biosynthesis and
Release by Nrf2-Expressing Glia Potently Protects Neurons from
Oxidative Stress
Andy Y.
Shih1,
Delinda A.
Johnson3,
Gloria
Wong1,
Andrew D.
Kraft3,
Lei
Jiang1,
Heidi
Erb1,
Jeffrey A.
Johnson3, 4, 5, 6, and
Timothy H.
Murphy1, 2
Kinsmen Laboratory of Neurological Research and Departments of
1 Psychiatry and2 Physiology, University of
British Columbia, Vancouver, British Columbia, V6T 1Z3, Canada, and
3 School of Pharmacy, 4 Molecular and
Environmental Toxicology Center, 5 Waisman Center, and
6 Center for Neuroscience, University of Wisconsin,
Madison, Wisconsin 53705-2222
Astrocytes have a higher antioxidant potential in
comparison to neurons. Pathways associated with this selective
advantage include the transcriptional regulation of antioxidant enzymes via the action of the Cap`n'Collar transcription factor Nrf2 at the
antioxidant response element (ARE). Here we show that Nrf2 overexpression can reengineer neurons to express this glial pathway and
enhance antioxidant gene expression. However, Nrf2-mediated protection
from oxidative stress is conferred primarily by glia in mixed
cultures. The antioxidant properties of Nrf2-overexpressing glia
are more pronounced than those of neurons, and a relatively small
number of these glia (< 1% of total cell number added) could protect fully cocultured naive neurons from oxidative glutamate toxicity associated with glutathione (GSH) depletion. Microarray and
biochemical analyses indicate a coordinated upregulation of enzymes
involved in GSH biosynthesis (xCT cystine antiporter, -glutamylcysteine synthetase, and GSH synthase), use (glutathione S-transferase and glutathione reductase), and export
(multidrug resistance protein 1) with Nrf2 overexpression, leading to
an increase in both media and intracellular GSH. Selective inhibition of glial GSH synthesis and the supplementation of media GSH indicated that an Nrf2-dependent increase in glial GSH synthesis was both necessary and sufficient for the protection of neurons, respectively. Neuroprotection was not limited to overexpression of Nrf2, because activation of endogenous glial Nrf2 by the small molecule ARE inducer,
tert-butylhydroquinone, also protected against oxidative glutamate toxicity.
Key words:
Nrf2; xCT; system
xc-; phase II detoxification enzymes; astrocyte; oxidative glutamate toxicity; glutathione; cystine
deprivation; tert-butylhydroquinone; antioxidant
response element; quinone reductase; oxidative stress; neuroprotection
Copyright © 2003 Society for Neuroscience 0270-6474/03/2383394-13$05.00/0
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