Cited by 138Genetic Neurodegenerative DiseasesMitochondrial Function and PathologyNeurological diseases and metabolism

Idebenone delays the onset of cardiac functional alteration without correction of Fe-S enzymes deficit in a mouse model for Friedreich ataxia

Seznec, H.·2004·Human Molecular Genetics

Abstract

Friedreich ataxia (FRDA), a progressive neurodegenerative disorder associated with cardiomyopathy, is caused by severely reduced frataxin, a mitochondrial protein involved in Fe-S cluster assembly. We have recently generated mouse models that reproduce important progressive pathological and biochemical features of the human disease. Our frataxin-deficient mouse models initially demonstrate time-dependent intramitochondrial iron accumulation, which occurs after onset of the pathology and after inactivation of the Fe-S dependent enzymes. Here, we report a more detailed pathophysiological characterization of our mouse model with isolated cardiac disease by echocardiographic, biochemical and histological studies and its use for placebo-controlled therapeutic trial with Idebenone. The Fe-S enzyme deficiency occurs at 4 weeks of age, prior to cardiac dilatation and concomitant development of left ventricular hypertrophy, while the mitochondrial iron accumulation occurs at a terminal stage. From 7 weeks onward, Fe-S enzyme activities are strongly decreased and are associated with lower levels of oxidative stress markers, as a consequence of reduced respiratory chain activity. Furthermore, we demonstrate that the antioxidant Idebenone delays the cardiac disease onset, progression and death of frataxin deficient animals by 1 week, but does not correct the Fe-S enzyme deficiency. Our results support the view that frataxin is a necessary, albeit non-essential, component of the Fe-S cluster biogenesis, and indicate that Idebenone acts downstream of the primary Fe-S enzyme deficit. Furthermore, our results demonstrate that Idebenone is cardioprotective even in the context of a complete lack of frataxin, which further supports its utilization for the treatment of FRDA.

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Crossref · 10.1093/hmg/ddh114

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Authors
Seznec, H.
Affiliations
Centre National de la Recherche Scientifique (FR)
Corresponding author
Seznec, H.
Venue
Human Molecular Genetics
Published
2004-03-17
Volume
13
Issue
10
Pages
1017-1024
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2124756854
Cited by
138
References
34
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 4 · 2022: 2 · 2021: 3 · 2020: 4 · 2019: 5 · 2018: 6 · 2017: 2 · 2016: 2 · 2015: 5 · 2014: 7 · 2013: 9 · 2012: 7
FWCI
5.03
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
  • HighWire Press Open Archive (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Neuroscience › Neurology › Neurological diseases and metabolism
Keywords
Friedreich's ataxia, idebenone, frataxin deficiency, iron-sulfur cluster assembly, mitochondrial iron accumulation, cardiomyopathy, left ventricular hypertrophy, oxidative stress, respiratory chain activity, cardioprotection
MeSH terms
Frataxin, Animals, Cardiomyopathy, Dilated, Disease Models, Animal, Electrocardiography, Friedreich Ataxia, Iron-Sulfur Proteins, Mitochondria, Myocardium, Ubiquinone, Benzoquinones, Oxidative Stress, Iron-Binding Proteins, Mice

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