Impaired mitochondrial oxidative phosphorylation in the peroxisomal disease X-linked adrenoleukodystrophy

López Erauskin, Jone; Galino, Jorge; Ruiz, M.; Cuezva, J. M.; Fabregat, I.; Cacabelos Barral, Daniel; Boada Pallàs, Jordi; Martínez, Juan José; Ferrer, Isidre; Pamplona Gras, Reinald; Villarroya, Francesc; Portero Otín, Manuel; Fourcade, Stéphane; Pujol, A.

doi:https://doi.org/10.1093/hmg/ddt186

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Issue date

2013

Author

López Erauskin, Jone

Galino, Jorge

Ruiz, M.

Cuezva, J. M.

Fabregat, I.

Cacabelos Barral, Daniel

Boada Pallàs, Jordi

Martínez, Juan José

Ferrer, Isidre

Pamplona Gras, Reinald

Villarroya, Francesc

Portero Otín, Manuel

Fourcade, Stéphane

Pujol, A.

Suggested citation

López Erauskin, Jone; Galino, Jorge; Ruiz, M.; Cuezva, J. M.; Fabregat, I.; Cacabelos Barral, Daniel; ... Pujol, A.. (2013) . Impaired mitochondrial oxidative phosphorylation in the peroxisomal disease X-linked adrenoleukodystrophy. Human Molecular Genetics, 2013, vol. 22, núm. 16, p. 3296-3305. https://doi.org/10.1093/hmg/ddt186.

Abstract

X-linked adrenoleukodystrophy (X-ALD) is an inherited metabolic disorder of the nervous system characterized by axonopathy in spinal cords and/or cerebral demyelination, adrenal insufficiency and accumulation of very long-chain fatty acids (VLCFAs) in plasma and tissues. The disease is caused by malfunction of the ABCD1 gene, which encodes a peroxisomal transporter of VLCFAs or VLCFA-CoA. In the mouse, Abcd1 loss causes late onset axonal degeneration in the spinal cord, associated with locomotor disability resembling the most common phenotype in patients, adrenomyeloneuropathy. We have formerly shown that an excess of the VLCFA C26:0 induces oxidative damage, which underlies the axonal degeneration exhibited by the Abcd1− mice. In the present study, we sought to investigate the noxious effects of C26:0 on mitochondria function. Our data indicate that in X-ALD patients' fibroblasts, excess of C26:0 generates mtDNA oxidation and specifically impairs oxidative phosphorylation (OXPHOS) triggering mitochondrial ROS production from electron transport chain complexes. This correlates with impaired complex V phosphorylative activity, as visualized by high-resolution respirometry on spinal cord slices of Abcd1− mice. Further, we identified a marked oxidation of key OXPHOS system subunits in Abcd1− mouse spinal cords at presymptomatic stages. Altogether, our results illustrate some of the mechanistic intricacies by which the excess of a fatty acid targeted to peroxisomes activates a deleterious process of oxidative damage to mitochondria, leading to a multifaceted dysfunction of this organelle. These findings may be of relevance for patient management while unveiling novel therapeutic targets for X-ALD.

URI

http://hdl.handle.net/10459.1/58502

DOI

https://doi.org/10.1093/hmg/ddt186

Is part of

Human Molecular Genetics, 2013, vol. 22, núm. 16, p. 3296-3305