Neurochemical Research

, Volume 28, Issue 10, pp 1563–1574 | Cite as

Mitochondrial Dysfunction and Reactive Oxygen Species in Excitotoxicity and Apoptosis: Implications for the Pathogenesis of Neurodegenerative Diseases

Article

Abstract

In recent years we have witnessed a major interest in the study of the role of mitochondria, not only as ATP producers through oxidative phosphorylation but also as regulators of intracellular Ca2+ homeostasis and endogenous producers of reactive oxygen species (ROS). Interestingly, the mitochondria have been also implicated as central executioners of cell death. Increased mitochondrial Ca2+ overload as a result of excitotoxicity has been associated with the generation of superoxide and may induce the release of proapoptotic mitochondrial proteins, proceeding through DNA fragmentation/condensation and culminating in cell demise by apoptosis and/or necrosis. In addition, these processes have been implicated in the pathogenesis of many neurodegenerative diseases, which share several features of cell death: selective brain areas undergo neurodegeneration, involving mitochondrial dysfunction (mitochondrial complexes are affected), loss of intracellular Ca2+ homeostasis, excitotoxicity, and the extracellular or intracellular accumulation of insoluble protein aggregates in the brain.

Apoptosis calcium homeostasis excitotoxicity mitochondrial depolarization neurodegenerative diseases oxidative stress 

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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  1. 1.Institute of Biochemistry, Faculty of Medicine and Center for Neuroscience and Cell BiologyUniversity of CoimbraCoimbraPortugal

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