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Dementia in Parkinson's disease is associated with enhanced mitochondrial complex I deficiency

Lookup NU author(s): Professor Johannes Attems


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© 2016 International Parkinson and Movement Disorder Society. Background: Dementia is a common feature of Parkinson's disease (PD), but the neuropathological changes associated with the development of Parkinson's disease dementia (PDD) are only partially understood. Mitochondrial dysfunction is a hallmark of PD but has not been studied in PDD. Methods: Molecular and biochemical approaches were used to study mitochondrial activity and quantity in postmortem prefrontal cortex tissue. Tissues from pathologically confirmed PD and PDD patients and from age-matched controls were used to analyze the activity of mitochondrial enzyme complex nicotinamide adenine dinucleotide:ubiquinone oxidoreductase, or complex I (the first enzyme in the mitochondrial respiratory chain), mitochondrial DNA levels, and the expression of mitochondrial proteins. Results: Complex I activity was significantly decreased (27% reduction; analysis of variance with Tukey's post hoc test; P<0.05) in PDD patients, and mitochondrial DNA levels were also significantly decreased (18% reduction; Kruskal-Wallis analysis of variance with Dunn's multiple comparison test; P<0.05) in PDD patients compared with controls, but neither was significantly reduced in PD patients. Overall, mitochondrial biogenesis was unaffected in PD or PDD, because the expression of mitochondrial proteins in patients was similar to that in controls. Conclusions: Patients with PDD have a deficiency in mitochondrial complex I activity and reduced mitochondrial DNA levels in the prefrontal cortex without a change in mitochondrial protein quantity. Therefore, mitochondrial complex I deficiency and reduced mitochondrial DNA in the prefrontal cortex may be a hallmark of dementia in patients with PD.

Publication metadata

Author(s): Gatt AP, Duncan OF, Attems J, Francis PT, Ballard CG, Bateman JM

Publication type: Article

Publication status: Published

Journal: Movement Disorders

Year: 2016

Volume: 31

Issue: 3

Pages: 352-359

Print publication date: 01/03/2016

Online publication date: 08/02/2016

Acceptance date: 16/11/2015

ISSN (print): 0885-3185

ISSN (electronic): 1531-8257

Publisher: John Wiley and Sons Inc.


DOI: 10.1002/mds.26513


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