Cited by 85Alzheimer's disease research and treatmentsMitochondrial Function and PathologyDementia and Cognitive Impairment Research

Mitochondrial enzyme expression in the hippocampus in relation to Alzheimer-type pathology

Nagy, Zs., Esiri, M. M., LeGris, M., Matthews, P. M.·1999·Acta Neuropathologica

Abstract

Recent reports have suggested that mitochondrial dysfunction may contribute to the progression of the pathology of Alzheimer's disease (AD). However, both increases and decreases in the activity of cytochrome oxidase have been described in the hippocampi of AD patients. In this study we used immunohistochemistry and quantitative autoradiographic methods to study the expression pattern of two cytochrome oxidase subunit proteins (nuclear-encoded COX IV and mitochondrial-encoded COX I) in the hippocampus in relation to the development of AD-type pathology. We found heterogeneous expression of both COX subunits in AD with an increased expression of both subunit proteins in healthy, non-tangle-bearing, neurones but absence of both subunit proteins in tangle-bearing neurones. Levels of COX IV but not of COX I were related to the amount of hyperphosphorylated tau accumulated in the same hippocampal region but not to the amount of amyloid deposited in sporadic AD. In Down's syndrome COX I and COX IV were similarly increased in the presence of AD pathology in non-tangle-bearing neurones. However, in these cases levels of enzyme expression were correlated to the amount of amyloid accumulation but not the amount of hyperphosphorylated tau in the hippocampus. We believe that heterogeneity of expression of mitochondrial enzyme proteins between neurones may contribute to the conflicting conclusions in previous reports regarding relative levels of cytochrome oxidase activity in the hippocampus in AD. We hypothesise that the increased mitochondrial enzyme expression in healthy-appearing neurones of AD brains may represent a physiological response to increased functional demand on surviving neurones as a consequence of AD-related neuronal pathology.

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Crossref · 10.1007/s004010050997

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  • In at least some hippocampal neurons COX subunit protein levels increase.

    “In at least some hippocampal neurons COX subunit protein levels also increase [140].”

    From Brain aging, Alzheimer's disease, and mitochondria (2011) · cites this paper as [140]

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Authors
Nagy, Z., Esiri, M. M., LeGris, M., & Matthews, P. M.
Affiliations
University of Oxford (GB)
Venue
Acta Neuropathologica
Published
1999-04-04
Volume
97
Issue
4
Pages
346-354
ISSN
  • 0001-6322 (ISSN-L)
  • 1432-0533
OpenAlex
W2040258716
Cited by
85
References
27
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 4 · 2019: 2 · 2018: 1 · 2017: 1 · 2016: 3 · 2015: 5 · 2014: 3 · 2013: 4 · 2012: 3
FWCI
1.89
Type
journal article
Language
en
Open access
closed
Locations
  • Acta Neuropathologica (publishedVersion)
  • PubMed (publishedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Funders
  • Bristol-Myers Squibb
  • Buddhist Tzu Chi Medical Foundation
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, mitochondrial dysfunction, cytochrome c oxidase, cytochrome c oxidase subunit IV, coxI, hippocampus, hyperphosphorylated tau, amyloid deposition, Down syndrome, neuronal heterogeneity
MeSH terms
Adolescent, Adult, Aged, Aged, 80 and over, Alzheimer Disease, Autoradiography, Cell Nucleus, Child, Child, Preschool, Electron Transport Complex IV, Down Syndrome, Hippocampus, Humans, Infant, Infant, Newborn, Isoenzymes, Middle Aged, Mitochondria, Neurons, Neurofibrillary Tangles, Fluorescent Antibody Technique, Indirect, Plaque, Amyloid

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