Pharmacotherapy for Friedreich Ataxia
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CNS Drugs 2009; 23 (3): 213-223 1172-7047/09/0003-0213/$49.95/0
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Pharmacotherapy for Friedreich Ataxia Amy Y. Tsou,1 Lisa S. Friedman,1,2,3 Robert B. Wilson4 and David R. Lynch1,2,3 1 Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA 2 Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA 3 Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA 4 Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA
Contents Abstract. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. Background . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. Idebenone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. Mitoquinone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. Deferiprone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5. Erythropoietin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6. Histone Deacetylase Inhibitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7. Symptomatic Treatments in Friedreich Ataxia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abstract
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Friedreich ataxia (FA) is a progressive genetic neurological disorder associated with degeneration of the dorsal columns, spinocerebellar tracts and other regions of the nervous system. The disorder results from mutations in the gene referred to as FXN. Almost all mutations are expansions of an intronic GAA repeat in this gene, which gives rise to decreased transcription of the gene product (called frataxin). Following these discoveries, drug discovery has moved at a rapid pace. Therapeutic trials in the next 5 years are expected to address amelioration of the effects of frataxin deficiency and methods for increasing frataxin expression. These therapies are directed at all levels of biochemical dysfunction in FA. Agents such as idebenone potentially improve mitochondrial function and decrease production of reactive oxygen species. Idebenone is presently in a phase III trial in the US and in Europe, with th
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