Dataset Information
Impaired nuclear Nrf2 translocation undermines the oxidative stress response in Friedreich ataxia.
Ontology highlight
ABSTRACT: Background
Friedreich ataxia originates from a decrease in mitochondrial frataxin, which causes the death of a subset of neurons. The biochemical hallmarks of the disease include low activity of the iron sulfur cluster-containing proteins (ISP) and impairment of antioxidant defense mechanisms that may play a major role in disease progression.Methodology/principal findings
We thus investigated signaling pathways involved in antioxidant defense mechanisms. We showed that cultured fibroblasts from patients with Friedreich ataxia exhibited hypersensitivity to oxidative insults because of an impairment in the Nrf2 signaling pathway, which led to faulty induction of antioxidant enzymes. This impairment originated from previously reported actin remodeling by hydrogen peroxide.Conclusions/significance
Thus, the defective machinery for ISP synthesis by causing mitochondrial iron dysmetabolism increases hydrogen peroxide production that accounts for the increased susceptibility to oxidative stress.
SUBMITTER: Paupe V
PROVIDER: S-EPMC2617762 | biostudies-literature | 2009
REPOSITORIES: biostudies-literature
Publications
Impaired nuclear Nrf2 translocation undermines the oxidative stress response in Friedreich ataxia.
PloS one 20090122 1
<h4>Background</h4>Friedreich ataxia originates from a decrease in mitochondrial frataxin, which causes the death of a subset of neurons. The biochemical hallmarks of the disease include low activity of the iron sulfur cluster-containing proteins (ISP) and impairment of antioxidant defense mechanisms that may play a major role in disease progression.<h4>Methodology/principal findings</h4>We thus investigated signaling pathways involved in antioxidant defense mechanisms. We showed that cultured f ...[more]
