Reduced protein phosphatase 2A activity induces hyperphosphorylation and altered compartmentalization of tau in transgenic mice
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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].”
From Physiologic functions of PP2A: Lessons from genetically modified mice (2019) · cites this paper as [51]
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Liu, R., Zhou, X. ‐., Tanila, H., Bjorkdahl, C., Wang, J. ‐., Guan, Z. ‐., Cao, Y., Gustafsson, J. ‐., Winblad, B., & Pei, J. ‐. (2008) · Journal of Cellular and Molecular Medicine · doi:10.1111/j.1582-4934.2008.00249.x · Cited by 125 · see citing works
Physiologic functions of PP2A: Lessons from genetically modified mice
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Louis, J. V., Martens, E., Borghgraef, P., Lambrecht, C., Sents, W., Longin, S., Zwaenepoel, K., Pijnenborg, R., Landrieu, I., Lippens, G., et al. (2011) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.1018777108 · Cited by 112 · see citing works
Self-citationMartens, E., Stevens, I., Janssens, V., Vermeesch, J., Götz, J., Goris, J., & Van Hoof, C. (2004) · Journal of Molecular Biology · doi:10.1016/j.jmb.2003.12.047 · Cited by 57 · see citing works
Self-citationSchmidt, K., Kins, S., Schild, A., Nitsch, R. M., Hemmings, B. A., & Götz, J. (2002) · European Journal of Neuroscience · doi:10.1046/j.1460-9568.2002.02274.x · Cited by 54 · see citing works
Self-citationTau acts as a mediator for<scp>A</scp>lzheimer's disease‐related synaptic deficits
Liao, D., Miller, E. C., & Teravskis, P. J. (2014) · European Journal of Neuroscience · doi:10.1111/ejn.12504 · Cited by 53 · see citing works
Tau-directed approaches for the treatment of Alzheimer’s disease: focus on leuco-methylthioninium
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Altered phosphorylation of cytoskeletal proteins in mutant protein phosphatase 2A transgenic mice
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Self-citationImpaired development of the Harderian gland in mutant protein phosphatase 2A transgenic mice
Schild, A., Isenmann, S., Tanimoto, N., Tonagel, F., Seeliger, M. W., Ittner, L. M., Kretz, A., Ogris, E., & Götz, J. (2006) · Mechanisms of Development · doi:10.1016/j.mod.2006.03.003 · Cited by 17 · see citing works
Targeting PP2A in cancer: an underrated option
Sarais, F., Krempien, F., Koehn, C., Brewing, L., Classen, C. F., Walter, M., & Shokraie, O. (2025) · Journal of Experimental & Clinical Cancer Research · doi:10.1186/s13046-025-03560-y · Cited by 8 · see citing works
- 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
- hybrid
- doi.org
- Licence
- 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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