Cited by 1,104Alzheimer's disease research and treatmentsMitochondrial Function and PathologyDementia and Cognitive Impairment Research

Mitochondria are a direct site of Aβ accumulation in Alzheimer's disease neurons: implications for free radical generation and oxidative damage in disease progression

Manczak, Maria, Anekonda, Thimmappa S., Henson, Edward, Park, Byung S., Quinn, Joseph, Reddy, P. Hemachandra·2006·Human Molecular Genetics

Abstract

Alzheimer's disease (AD) is a complex, neurodegenerative disease characterized by the impairment of cognitive function in elderly individuals. In a recent global gene expression study of APP transgenic mice, we found elevated expression of mitochondrial genes, which we hypothesize represents a compensatory response because of mitochondrial oxidative damage caused by the over-expression of mutant APP and/or amyloid beta (Abeta). We investigated this hypothesis in a series of experiments examining what forms of APP and Abeta localize to the mitochondria, and whether the presence of these species is associated with mitochondrial dysfunction and oxidative damage. Using immunoblotting, digitonin fractionation, immunofluorescence, and electron microscopy techniques, we found a relationship between mutant APP derivatives and mitochondria in brain slices from Tg2576 mice and in mouse neuroblastoma cells expressing mutant human APP. Further, to determine the functional relationship between mutant APP/Abeta and oxidative damage, we quantified Abeta levels, hydrogen peroxide production, cytochrome oxidase activity and carbonyl proteins in Tg2576 mice and age-matched wild-type (WT) littermates. Hydrogen peroxide levels were found to be significantly increased in Tg2576 mice when compared with age-matched WT littermates and directly correlated with levels of soluble Abeta in Tg2576 mice, suggesting that soluble Abeta may be responsible for the production of hydrogen peroxide in AD progression in Tg2576 mice. Cytochrome c oxidase activity was found to be decreased in Tg2576 mice when compared with age-matched WT littermates, suggesting that mutant APP and soluble Abeta impair mitochondrial metabolism in AD development and progression. An increase in hydrogen peroxide and a decrease in cytochrome oxidase activity were found in young Tg2576 mice, prior to the appearance of Abeta plaques. These findings suggest that early mitochondrially targeted therapeutic interventions may be effective in delaying AD progression in elderly individuals and in treating AD patients.

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Authors
Manczak, M., Anekonda, T. S., Henson, E., Park, B. S., Quinn, J., & Reddy, P. H.
Affiliations
Oregon Health & Science University (US)
Venue
Human Molecular Genetics
Published
2006-03-21
Volume
15
Issue
9
Pages
1437-1449
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2124955411
Cited by
1,104
References
61
Citations by year
2026: 34 · 2025: 41 · 2024: 40 · 2023: 49 · 2022: 44 · 2021: 60 · 2020: 60 · 2019: 51 · 2018: 66 · 2017: 65 · 2016: 67 · 2015: 53 · 2014: 55 · 2013: 63 · 2012: 89
FWCI
30.22
Type
journal article
Language
en
Open access
closed
Locations
  • Human Molecular Genetics (publishedVersion)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • American Federation for Aging Research
  • Oregon Health and Science University
  • National Institutes of Health
  • National Center for Research Resources (S10RR016858, RR-016858)
  • National Center for Complementary and Integrative Health (NIH-AT0006)
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, amyloid-beta, mitochondria, mitochondrial dysfunction, oxidative damage, hydrogen peroxide, cytochrome c oxidase, protein carbonyls, Tg2576 mice, APP transgenic mice, mitochondrial gene expression, neurodegeneration
MeSH terms
Alzheimer Disease, Animals, Free Radicals, Humans, Intracellular Membranes, Membrane Potentials, Mice, Transgenic, Mitochondria, Neurons, Peptide Fragments, Amyloid beta-Peptides, Oxidative Stress, Disease Progression, Cell Line, Tumor, Mice

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