A selective defect of cytochrome c oxidase is present in brain of Alzheimer disease patients
Abstract
To assess mitochondrial function and test the hypothesis of an underlying oxidative phosphorylation defect in Alzheimer disease (AD), we evaluated the activities of mitochondrial respiratory chain enzyme complexes I+III, complexes II+III, complex IV (cytochrome c oxidase, COX), succinate dehydrogenase, and citrate synthase in the frontal cortex, temporal cortex, hippocampus, and cerebellum of 23 AD patients and 13 normal human brains. The major finding was a significant decrease in COX activity in AD temporal cortex and hippocampus, both whether activities were expressed per noncollagen protein content (49 +/-4.6 versus 78+/-10.8 nmol/min/mg NCP, P = 0.006; 23+/-1.9 versus 48.6+/-8.1 nmol/min/mg NCP, p = 0.003) or corrected for citrate synthase activity (1.6+/-0.2 versus 3+/-0.4, P = 0.001; 0.76+/-0.1 versus 1.76+/-0.26, P = 0.0009). There were no significant differences in the activities of complexes I+III, II+III, and of succinate dehydrogenase in any of the brain regions examined. Our results suggest a specific defect of COX in the AD brain versus the normal human brain, which may contribute to impaired energy generation. Biochemically, the defect is confined to selected brain regions, suggesting anatomic specificity.
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Compelling evidence links neurodegeneration to altered brain metabolism and mitochondrial dysfunction, both of which are early hallmarks of Alzheimer's disease.
“Compelling evidence links neurodegeneration to altered brain metabolism and mitochondrial dysfunction, both of which are early hallmarks of AD [21–28].”
From Neuronal Apolipoprotein E4 Expression Results in Proteome-Wide Alterations and Compromises Bioenergetic Capacity by Disrupting Mitochondrial Function (2019) · cites this paper as [23]
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- Authors
- Maurer, I.
- Affiliations
- Friedrich Schiller University Jena (DE)
- Corresponding author
- Maurer, I
- Venue
- Neurobiology of Aging
- Publisher
- Elsevier BV
- Published
- 2000-06
- Volume
- 21
- Issue
- 3
- Pages
- 455-462
- ISSN
- 0197-4580 (ISSN-L)
- OpenAlex
- W2006909664
- Cited by
- 475
- References
- 3
- Citations by year
- 2026: 7 · 2025: 12 · 2024: 10 · 2023: 21 · 2022: 24 · 2021: 23 · 2020: 29 · 2019: 25 · 2018: 22 · 2017: 18 · 2016: 24 · 2015: 19 · 2014: 18 · 2013: 26 · 2012: 22
- FWCI
- 1.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neurobiology of Aging (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
- Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
- Keywords
- Alzheimer's disease, cytochrome c oxidase, mitochondrial dysfunction, oxidative phosphorylation, respiratory chain complexes, citrate synthase, succinate dehydrogenase, hippocampus, temporal cortex, frontal cortex, cerebellum, brain energy metabolism
- MeSH terms
- Aged, Aged, 80 and over, Alzheimer Disease, Brain, Cerebral Cortex, Electron Transport Complex IV, Female, Hippocampus, Humans, Male, Middle Aged, Mitochondria, Oxidative Phosphorylation, Succinate Dehydrogenase
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