Cited by 439Alzheimer's disease research and treatmentsGlycosylation and Glycoproteins ResearchDementia and Cognitive Impairment Research

Reduced O-GlcNAcylation links lower brain glucose metabolism and tau pathology in Alzheimer's disease

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Liu, F., Shi, J., Tanimukai, H., Gu, J., Gu, J., Grundke-Iqbal, I., Iqbal, K., Gong, C.-X.·2009·Brain

Abstract

It has been established for a long time that brain glucose metabolism is impaired in Alzheimer's disease. Recent studies have demonstrated that impaired brain glucose metabolism precedes the appearance of clinical symptoms, implying its active role in the development of Alzheimer's disease. However, the molecular mechanism by which this impairment contributes to the disease is not known. In this study, we demonstrated that protein O-GlcNAcylation, a common post-translational modification of nucleocytoplasmic proteins with beta-N-acetyl-glucosamine and a process regulated by glucose metabolism, was markedly decreased in Alzheimer's disease cerebrum. More importantly, the decrease in O-GlcNAc correlated negatively with phosphorylation at most phosphorylation sites of tau protein, which is known to play a crucial role in the neurofibrillary degeneration of Alzheimer's disease. We also found that hyperphosphorylated tau contained 4-fold less O-GlcNAc than non-hyperphosphorylated tau, demonstrating for the first time an inverse relationship between O-GlcNAcylation and phosphorylation of tau in the human brain. Downregulation of O-GlcNAcylation by knockdown of O-GlcNAc transferase with small hairpin RNA led to increased phosphorylation of tau in HEK-293 cells. Inhibition of the hexosamine biosynthesis pathway in rat brain resulted in decreased O-GlcNAcylation and increased phosphorylation of tau, which resembled changes of O-GlcNAcylation and phosphorylation of tau in rodent brains with decreased glucose metabolism induced by fasting, but not those in rat brains when protein phosphatase 2A was inhibited. Comparison of tau phosphorylation patterns under various conditions suggests that abnormal tau hyperphosphorylation in Alzheimer's disease brain may result from downregulation of both O-GlcNAcylation and protein phosphatase 2A. These findings suggest that impaired brain glucose metabolism leads to abnormal hyperphosphorylation of tau and neurofibrillary degeneration via downregulation of tau O-GlcNAcylation in Alzheimer's disease. Thus, restoration of brain tau O-GlcNAcylation and protein phosphatase 2A activity may offer promising therapeutic targets for treating Alzheimer's disease.

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Authors
Liu, F., Shi, J., Tanimukai, H., Gu, J., Gu, J., Grundke-Iqbal, I., Iqbal, K., & Gong, C.-X.
Affiliations
Nantong University (CN)
Venue
Brain
Published
2009-05-18
Volume
132
Issue
7
Pages
1820-1832
ISSN
  • 0006-8950 (ISSN-L)
  • 1460-2156
OpenAlex
W2171758504
Cited by
439
References
69
Citations by year
2026: 21 · 2025: 27 · 2024: 41 · 2023: 31 · 2022: 30 · 2021: 33 · 2020: 36 · 2019: 23 · 2018: 29 · 2017: 29 · 2016: 21 · 2015: 15 · 2014: 33 · 2013: 15 · 2012: 14
FWCI
11.93
Type
journal article
Language
en
Open access
Locations
  • Brain (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Institute on Aging (P30-AG-19610, R01AG019158, R01AG027429, P30AG019610)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glycosylation and Glycoproteins Research
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, O-GlcNAcylation, tau hyperphosphorylation, brain glucose metabolism, protein phosphatase 2A, hexosamine biosynthetic pathway, neurofibrillary degeneration, O-GlcNAc transferase, post-translational modification, fasting
MeSH terms
Aged, 80 and over, Alzheimer Disease, Brain, Cells, Cultured, Female, Glucose, Hexosamines, Humans, Male, Phosphorylation, Down-Regulation, tau Proteins, N-Acetylglucosaminyltransferases, Protein Phosphatase 2

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