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N-methyl-D-aspartate Receptor Subtypes: Multiple Roles in Excitotoxicity and Neurological Disease
Elisa A. Waxman
Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia
David R. Lynch
Departments of Neurology and Pediatrics, University of Pennsylvania School of Medicine, Philadelphia and the Division of Neurology, Children’s Hospital of Philadelphia, lynch{at}pharm.med.upenn.edu
N-methyl-D-aspartate (NMDA) receptors are the major mediator of excitotoxicity. Although physiological activation of the NMDA receptor is necessary for cell survival, overactivation is a signal for cell death. Several pathways are activated through NMDA receptor stimulation, most of which can contribute to excitotoxicity. These include events leading to mitochondrial dysfunction, activation of calcium-dependent enzymes, and activation of mitogen-activated protein kinase pathways. Understanding the role of these mechanisms is important in developing agents that block excitotoxicity without inhibiting functions necessary for survival. NMDA receptor subtypes may be responsible for mediating separate pathways, and subtype-specific inhibition has shown promising results in some neurological models. This review examines the roles of NMDA receptor subtypes in excitotoxicity and neurological disorders.
Key Words: NMDA • Excitotoxicity • NR2A • NR2B • Huntington’s disease • Parkinson’s disease • Epilepsy • MAPK • Calpain • Calmodulin
The Neuroscientist, Vol. 11, No. 1,
37-49 (2005)
DOI: 10.1177/1073858404269012
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