Mitochondrial impairments contribute to Spinocerebellar ataxia type 1 progression and can be ameliorated by the mitochondria-targeted antioxidant MitoQ

Stucki, David; Ruegsegger, Céline; Steiner, Silvio; Radecke, Julika; Murphy, MP; Zuber, Benoît; Saxena, Smita (2016). Mitochondrial impairments contribute to Spinocerebellar ataxia type 1 progression and can be ameliorated by the mitochondria-targeted antioxidant MitoQ. Free radical biology & medicine, 97, pp. 427-440. Elsevier 0.1016/j.freeradbiomed.2016.07.005

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Spinocerebellar ataxia type 1 (SCA1), due to an unstable polyglutamine expansion within the ubiquitously expressed Ataxin-1 protein, leads to the premature degeneration of Purkinje cells (PCs), decreasing motor coordination and causing death within 10-15 years of diagnosis. Currently, there are no therapies available to slow down disease progression. As secondary cellular impairments contributing to SCA1 progression are poorly understood, here, we focused on identifying those processes by performing a PC specific proteome profiling of Sca1154Q/2Q mice at a symptomatic stage. Mass spectrometry analysis revealed prominent alterations in mitochondrial proteins. Immunohistochemical and serial block-face scanning electron microscopy analyses confirmed that PCs underwent age-dependent alterations in mitochondrial morphology. Moreover, colorimetric assays demonstrated impairment of the electron transport chain complexes (ETC) and decrease in ATPase activity. Subsequently, we examined whether the mitochondria-targeted antioxidant MitoQ could restore mitochondrial dysfunction and prevent SCA1-associated pathology in Sca1154Q/2Q mice. MitoQ treatment both presymptomatically and when symptoms were evident ameliorated mitochondrial morphology and restored the activities of the ETC complexes. Notably, MitoQ slowed down the appearance of SCA1-linked neuropathology such as lack of motor coordination as well as preventing oxidative stress-induced DNA / RNA damage and PC loss. Our work identifies a central role for mitochondria in PC degeneration in SCA1 and provides evidence for the supportive use of mitochondria-targeted therapeutics in slowing down disease progression.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Pre-clinic Human Medicine > Institute of Anatomy
08 Faculty of Science > Department of Biology > Institute of Cell Biology
09 Interdisciplinary Units > Microscopy Imaging Center (MIC)

Graduate School:

Graduate School for Cellular and Biomedical Sciences (GCB)

UniBE Contributor:

Stucki, David; Ruegsegger, Céline; Radecke, Julika; Zuber, Benoît and Saxena, Smita

Subjects:

600 Technology > 610 Medicine & health
500 Science > 570 Life sciences; biology

ISSN:

0891-5849

Publisher:

Elsevier

Language:

English

Submitter:

Prof. Smita Saxena

Date Deposited:

12 Jul 2016 08:40

Last Modified:

14 Feb 2019 18:04

Publisher DOI:

0.1016/j.freeradbiomed.2016.07.005

PubMed ID:

27394174

BORIS DOI:

10.7892/boris.84445

URI:

https://boris.unibe.ch/id/eprint/84445

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