Cited by 126Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Phosphorylated PP2A (tyrosine 307) is associated with Alzheimer neurofibrillary pathology

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Liu, R., Zhou, X.‐W., Tanila, H., Bjorkdahl, C., Wang, J.‐Z., Guan, Z.‐Z., Cao, Y., Gustafsson, J.‐Å. +2 more·2008·Journal of Cellular and Molecular Medicine

Abstract

Down-regulation of protein phosphatase 2A (PP2A) is thought to play a critical role in tau hyperphosphorylation in Alzheimer's disease (AD). In vitro phosphorylation of PP2A catalytic subunit at Y307 efficiently inactivates PP2A. A specific antibody against phosphorylated (p) PP2A (Y307) (PP2Ac-Yp307) was used to investigate possible PP2A down-regulation by known pathophysiological changes associated with AD, such as Abeta accumulation and oestrogen deficiency. Immunohistochemistry and immunofluorescence confocal microscopy showed an aberrant accumulation of PP2Ac-Yp307 in neurons that bear pretangles or tangles in the susceptible brain regions, such as the entorhinal cortical cortex and the hippocampus. Experimentally, increased PP2Ac-Yp307 was observed in mouse N2a neuroblastoma cells that stably express the human amyloid precursor protein with Swedish mutation (APPswe) compared with wild-type, and in the brains of transgenic APPswe/ presenilin (PS1, A246E) mice, which corresponded to the increased tau phosphorylation. Treating N2a cells with Abeta25-35 mimicked the changes of PP2Ac-Yp307 and tau phosphorylation in N2a APPswe cells. Knockout of oestrogen receptor (ER) alpha or ERbeta gave similar changes of PP2Ac-Yp307 level and tau phosphorylation in the mouse brain. Taken together, these findings suggest that increased PP2A phosphorylation (Y307) can be mediated by Abeta deposition or oestrogen deficiency in the AD brain, and consequently compromise dephosphorylation of abnormally hyperphosphorylated tau, and lead to neurofibrillary tangle formation.

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Crossref · 10.1111/j.1582-4934.2008.00249.x

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Authors
Liu, R., Zhou, X. ‐., Tanila, H., Bjorkdahl, C., Wang, J. ‐., Guan, Z. ‐., Cao, Y., Gustafsson, J. ‐., Winblad, B., & Pei, J. ‐.
Affiliations
  • Karolinska Institutet (SE)
  • University of Eastern Finland (FI)
  • Huazhong University of Science and Technology (CN)
  • Guiyang Medical University (CN)
Corresponding author
Liu, R.
Venue
Journal of Cellular and Molecular Medicine
Publisher
Wiley
Published
2008-01
Volume
12
Issue
1
Pages
241-257
ISSN
  • 1582-1838 (ISSN-L)
  • 1582-4934
OpenAlex
W1995042713
Cited by
125
References
41
Citations by year
2026: 1 · 2024: 2 · 2023: 5 · 2022: 8 · 2021: 5 · 2020: 8 · 2019: 8 · 2018: 8 · 2017: 4 · 2016: 3 · 2015: 3 · 2014: 11 · 2013: 10 · 2012: 12
FWCI
8.35
Type
journal article
Language
en
Open access
Locations
  • Journal of Cellular and Molecular Medicine (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
protein phosphatase 2A, Alzheimer's disease, neurofibrillary tangles, tau hyperphosphorylation, amyloid-beta, estrogen deficiency, estrogen receptor alpha, estrogen receptor beta, APPswe, presenilin 1, entorhinal cortex, hippocampus, N2a cells
MeSH terms
Aged, Aged, 80 and over, Alzheimer Disease, Animals, Antibodies, Monoclonal, Estrogens, Female, Humans, Male, Mice, Transgenic, Mutation, Neuroblastoma, Neurons, Phosphorylation, Transfection, Tyrosine, Amyloid beta-Protein Precursor, Neurofibrillary Tangles, tau Proteins, Microscopy, Confocal, Fluorescent Antibody Technique, Indirect, Estrogen Receptor alpha, Estrogen Receptor beta, Mice, Protein Phosphatase 2

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