The Mitochondrial Impairment, Oxidative Stress and Neurodegeneration Connection: Reality or Just an Attractive Hypothesis?

Overview

Journal Trends Neurosci

Specialty Neurology

Date 2008 Apr 12

PMID 18403030

Citations 103

Authors

Hirokazu Fukui

Carlos T Moraes

Affiliations

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Abstract

Aging is the most important risk factor for common neurodegenerative disorders such as Parkinson's and Alzheimer's diseases. Aging in the central nervous system has been associated with elevated mutation load in mitochondrial DNA, defects in mitochondrial respiration and increased oxidative damage. These observations support a 'vicious cycle' theory which states that there is a feedback mechanism connecting these events in aging and age-associated neurodegeneration. Despite being an extremely attractive hypothesis, the bulk of the evidence supporting the mitochondrial vicious cycle model comes from pharmacological experiments in which the modes of mitochondrial enzyme inhibition are far from those observed in real life. Furthermore, recent in vivo evidence does not support this model. In this review, we focus on the relationship among the components of the putative vicious cycle, with particular emphasis on the role of mitochondrial defects on oxidative stress.

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