Cited by 203Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Reduced protein phosphatase 2A activity induces hyperphosphorylation and altered compartmentalization of tau in transgenic mice

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Kins, Stefan, Crameri, Arames, Evans, David R.H., Hemmings, Brian A., Nitsch, Roger M., Götz, Jürgen·2001·Journal of Biological Chemistry

Abstract

Hyperphosphorylated isoforms of the microtubule-associated protein tau are the major components of neurofibrillary lesions in Alzheimer's disease (AD). Protein phosphatase (PP) 2A is a major phosphatase implicated in tau dephosphorylation in vitro. Dephosphorylation of tau can be blocked in vivo by okadaic acid, a potent inhibitor of PP2A. Moreover, activity of PP2A is reduced in AD brains. To elucidate the role of PP2A in tau phosphorylation and pathogenesis, we expressed a dominant negative mutant form of the catalytic subunit Calpha of PP2A, L199P, in mice by using a neuron-specific promoter. We obtained mice with high expression levels of Calpha L199P in cortical, hippocampal, and cerebellar neurons. PP2A activity in brain homogenates of transgenic mice was reduced to 66%. Endogenous tau protein was hyperphosphorylated at distinct sites including the AT8 epitope Ser-202/Thr-205, a major AD-associated tau phosphoepitope. AT8-positive tau aggregates accumulated in the soma and dendrites of cortical pyramidal cells and cerebellar Purkinje cells and co-localized with ubiquitin. Our data establish that PP2A plays a crucial role in tau phosphorylation. Our results also show that reduced PP2A activity is associated with altered compartmentalization and ubiquitination of tau, resembling a key pathological finding in AD.

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  • Neuron-specific expression of the dominant negative L199P Cα mutant induced tau hyperphosphorylation at the physiological AT8 (Ser202/205) and pathological pS422 (Ser422) epitopes, accompanied by formation of ubiquitin-containing tau aggregates in somatodendritic neuronal compartments.

    “Neuron-specific expression of the dominant negative L199P Cα mutant also induced tau hyperphosphorylation at the physiological AT8 (Ser202/205) and pathological pS 422 (Ser422) epitopes, accompanied by the formation of ubiquitin-containing tau aggregates in the somatodendritic neuronal compartments [51].”

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  1. Grundke-Iqbal, I., Iqbal, K., Tung, Y. C., Quinlan, M., Wisniewski, H. M., and Binder, L. I. (1986) Proc. Natl. Acad. Sci. U. S. A. 83, 4913-4917
  2. Alonso, A. C., Zaidi, T., Grundke-Iqbal, I., and Iqbal, K. (1994) Proc. Natl. Acad. Sci. U. S. A. 91, 5562-5566
  3. Gotz, J., Probst, A., Ehler, E., Hemmings, B., and Kues, W. (1998) Proc. Natl. Acad. Sci. U. S. A. 95, 12370 -12375
  4. Kollias, G., Spanopoulou, E., Grosveld, F., Ritter, M., Beech, J., and Morris, R. (1987) Proc. Natl. Acad. Sci. U. S. A. 84, 1492-1496

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Authors
Kins, S., Crameri, A., Evans, D. R. H., Hemmings, B. A., Nitsch, R. M., & Götz, J.
Affiliations
  • University of Zurich (CH)
  • Friedrich Miescher Institute (CH)
Corresponding author
Götz, Jürgen
Venue
Journal of Biological Chemistry
Published
2001-10
Volume
276
Issue
41
Pages
38193-38200
ISSN
0021-9258 (ISSN-L)
OpenAlex
W1564414547
Cited by
203
References
78
Citations by year
2025: 3 · 2024: 4 · 2023: 2 · 2022: 2 · 2021: 7 · 2020: 9 · 2019: 4 · 2018: 6 · 2017: 5 · 2016: 10 · 2014: 9 · 2013: 9 · 2012: 11
FWCI
7.77
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • 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, tau hyperphosphorylation, tau dephosphorylation, Alzheimer's disease, dominant-negative mutant, ubiquitination, neurofibrillary tangles, transgenic mice, Purkinje cells, cortical pyramidal neurons
MeSH terms
Animals, Base Sequence, Cell Compartmentation, Humans, Immunohistochemistry, Mice, Transgenic, Neurons, Phosphoprotein Phosphatases, Phosphorylation, tau Proteins, DNA Primers, Mice, Protein Phosphatase 2

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