Regulatory control of glutamate - induced neuronal superoxide production Project Summary/Abstract Glutamate excitotoxicity is a primary cause of cell death in stroke, brain trauma. Neuronal production of superoxide is necessary for excitotoxic cell death to occur. Glutamate-induced superoxide production has long been considered an inevitable, physical consequence of calcium influx and resulting mitochondrial dysfunction, but recent studies show that the superoxide is instead produced by the signaling enzyme, NADPH oxidase. Here we aim to delineate key regulatory steps in the signal transduction pathway linking neuronal glutamate receptor activation to NADPH oxidase activation, and the role of this process in local cell-to-cell propagation of excitotoxic injury. Preliminary studies suggest that key components of this pathway include the NR2B subunit of NMDA-type glutamate receptors, phosphoinositol-3-kinase (PI3K), PTEN, and phospholipase A2. The studies proposed here will evaluate the importance of each of these components using pharmacological, dominant negative, and genetic approaches. We also aim to identify mechanisms by which NADPH oxidase and mitochondria may interact in superoxide production. These studies will be performed using dissociated neuronal cultures, brain slices, and whole-animal experimental models. Successful completion of these studies will reconcile long-standing contradictions in this field, and will identify novel targets and mechanisms contributing to both acute and chronic neurological disorders. These studies will also further our understanding of the molecular framework for normal superoxide signaling between neurons, a process thought to modulate synaptic plasticity in brain. 1

Public Health Relevance

Glutamate - induced neuronal death is an important cause of neural injury in both acute-onset disorders such as stroke and trauma, and more chronic disorders such as amyotrophic lateral sclerosis and Alzheimer's disease. The reactive oxygen species, superoxide, is known to mediate glutamate-induced neuronal death. Studies proposed here will identify key steps leading from glutamate receptor activation to the production of superoxide, and thereby identify ways of blocking or modulating this important cell injury pathway.

National Institute of Health (NIH)
National Institute of Neurological Disorders and Stroke (NINDS)
Research Project (R01)
Project #
Application #
Study Section
Neural Oxidative Metabolism and Death Study Section (NOMD)
Program Officer
Bosetti, Francesca
Project Start
Project End
Budget Start
Budget End
Support Year
Fiscal Year
Total Cost
Indirect Cost
Northern California Institute Research & Education
San Francisco
United States
Zip Code
Xu, Jianguo; Wang, Handong; Won, Seok Joon et al. (2016) Microglial activation induced by the alarmin S100B is regulated by poly(ADP-ribose) polymerase-1. Glia 64:1869-78
Swanson, Raymond A (2015) Brain glycogen--vestigial no more. Foreword. Metab Brain Dis 30:251-3
Gulati, Tanuj; Won, Seok Joon; Ramanathan, Dhakshin S et al. (2015) Robust neuroprosthetic control from the stroke perilesional cortex. J Neurosci 35:8653-61
Brennan-Minnella, Angela M; Won, Seok Joon; Swanson, Raymond A (2015) NADPH oxidase-2: linking glucose, acidosis, and excitotoxicity in stroke. Antioxid Redox Signal 22:161-74
Won, Seok Joon; Kim, Ji-Eun; Cittolin-Santos, Giordano Fabricio et al. (2015) Assessment at the single-cell level identifies neuronal glutathione depletion as both a cause and effect of ischemia-reperfusion oxidative stress. J Neurosci 35:7143-52
Katz, Maya; Won, Seok Joon; Park, Youngja et al. (2015) Cerebrospinal fluid concentrations of N-acetylcysteine after oral administration in Parkinson's disease. Parkinsonism Relat Disord 21:500-3
Chen, Yanting; Brennan-Minnella, Angela M; Sheth, Sunil et al. (2015) Tat-NR2B9c prevents excitotoxic neuronal superoxide production. J Cereb Blood Flow Metab 35:739-42
Sheth, Sunil A; Iavarone, Anthony T; Liebeskind, David S et al. (2015) Targeted Lipid Profiling Discovers Plasma Biomarkers of Acute Brain Injury. PLoS One 10:e0129735
Swanson, Raymond A (2014) Glucose, acid, and aspartate: Friends and foes of the axon. Ann Neurol 75:490-1
Robbins, Nathaniel M; Swanson, Raymond A (2014) Opposing effects of glucose on stroke and reperfusion injury: acidosis, oxidative stress, and energy metabolism. Stroke 45:1881-6

Showing the most recent 10 out of 15 publications