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Iron-dependent functions of mitochondria—relation to neurodegeneration

Journal of Neural Transmission volume 118, pages 349–359 (2011)Cite this article

Abstract

A number of neurodegenerative diseases are associated with iron dyshomeostasis and mitochondrial dysfunction. However, the pathomechanistic interplay between iron and mitochondria varies. This review summarises the physiological role of iron in mitochondria and subsequently exemplifies two neurodegenerative diseases with disturbed iron function in mitochondria: inherited Friedreich ataxia (FRDA) and idiopathic Parkinson disease (PD). In eukaryotes, mitochondria are main consumers of iron. The respiratory chain relies on iron-containing redox systems in the form of complexes I–III with iron–sulphur clusters and cytochromes with haem as prosthetic groups. The bifunctional enzyme aconitase is not only important in the citric acid cycle, but also functions as a key regulator of cell iron metabolism. Haem biosynthesis occurs partially in mitochondria as well as the biogenesis of iron–sulphur clusters that are co-factors in numerous iron–sulphur proteins. FRDA is characterised by a mutation of the frataxin gene, the protein of which serves as an iron chaperone in iron–sulphur cluster assembly. The lack of frataxin expression leads to defective iron–sulphur cluster biogenesis with decreased respiratory and aconitase activity. The resulting mitochondrial iron overload might fuel reactive oxygen species formation and contribute to clinical signs of oxidative stress. PD is typically associated with an increased iron content of the substantia nigra, the causes of which are largely unknown. Recent research demonstrated raised iron levels in individual dopaminergic neurons of the substantia nigra. Moreover, transferrin/transferrin receptor 2 mediated transport of iron into the mitochondria of these neurons was identified together with increased transferrin immunoreactivity. Resulting accumulation of iron into mitochondria might lead to oxidative stress damaging iron–sulphur cluster-containing proteins.

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    Gabriele Gille & Heinz Reichmann

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Gille, G., Reichmann, H. Iron-dependent functions of mitochondria—relation to neurodegeneration. J Neural Transm 118, 349–359 (2011). https://doi.org/10.1007/s00702-010-0503-7

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Keywords

  • Iron
  • Mitochondria
  • Iron-sulphur cluster biogenesis
  • Friedreich ataxia
  • Parkinson disease