from Part II - Cell Death in Tissues and Organs
Published online by Cambridge University Press: 07 September 2011
Summary
Several chronic neurodegenerative disorders manifest deposits of misfolded or aggregated proteins. Genetic mutations are the root cause for protein misfolding in rare families, but the majority of patients have sporadic forms possibly related to environmental factors. In some cases, the ubiquitin-proteasome system or molecular chaperones can prevent accumulation of aberrantly folded proteins. Recent studies suggest that generation of excessive nitric oxide (NO) and reactive oxygen species, in part due to overactivity of the N-methyl-D-aspartate (NMDA) subtype of glutamate receptor, can mediate protein misfolding in the absence of genetic mutation. S-Nitrosylation, or covalent reaction of NO with specific protein thiol groups, represents one mechanism contributing to NO-induced protein misfolding and neurotoxicity. Here, we present evidence suggesting that NO contributes to protein misfolding via S-nitrosylating protein-disulfide isomerase or the E3 ubiquitin ligase parkin. We discuss how the drugs memantine or NitroMemantine can inhibit excessive NMDA receptor activity to ameliorate NO production, protein misfolding, and neurodegeneration.
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