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Aβ-Mediated NMDA Receptor Endocytosis in Alzheimer's Disease Involves Ubiquitination of the Tyrosine Phosphatase STEP61

Open access
Kurup, Pradeep, Zhang, Yongfang, Xu, Jian, Venkitaramani, Deepa V., Haroutunian, Vahram, Greengard, Paul, Nairn, Angus C., Lombroso, Paul J.·2010·The Journal of Neuroscience

Abstract

Amyloid β (Aβ) is involved in the etiology of Alzheimer's disease (AD) and may contribute to cognitive deficits by increasing internalization of ionotropic glutamate receptors. Striatal-enriched protein tyrosine phosphatase 61 (STEP 61), which is targeted in part to the postsynaptic terminal, has been implicated in this process. Here we show that STEP 61 levels are progressively increased in the cortex of Tg2576 mice over the first year, as well as in prefrontal cortex of human AD brains. The increased STEP 61 was associated with greater STEP activity, dephosphorylation of phospho-tyr 1472 of the NR2B subunit, and decreased NR1 and NR2B subunits on neuronal membranes. Treatment with Aβ-enriched medium also increased STEP 61 levels and decreased NR1/NR2B abundance in mouse cortical cultures as determined by biotinylation experiments. In STEP knock-out cultures, Aβ treatment failed to induce NMDA receptor internalization. The mechanism for the increase in STEP 61 levels appears to involve the ubiquitin proteasome system. Blocking the proteasome resulted in elevated levels of STEP 61. Moreover, STEP 61–ubiquitin conjugates were increased in wild-type cortical slices upon Aβ treatment as well as in 12 month Tg2576 cortex. These findings reveal a novel mechanism by which Aβ-mediated accumulation of STEP 61 results in increased internalization of NR1/NR2B receptor that may contribute to the cognitive deficits in AD.

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Metadata

Authors
Kurup, P., Zhang, Y., Xu, J., Venkitaramani, D. V., Haroutunian, V., Greengard, P., Nairn, A. C., & Lombroso, P. J.
Venue
The Journal of Neuroscience
Published
2010-04-28
Volume
30
Issue
17
Pages
5948-5957
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2016323146
Cited by
224
References
16
FWCI
13.13
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Aβ-Mediated NMDA Receptor Endocytosis in Alzheimer's Disease Involves Ubiquitination of the Tyrosine Phosphatase STEP61. https://app.cochat.ai/papers/10.1523/jneurosci.0157-10.2010
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Kurup, P., Zhang, Y., Xu, J., Venkitaramani, D. V., Haroutunian, V., Greengard, P., Nairn, A. C., & Lombroso, P. J. (2010). Aβ-Mediated NMDA Receptor Endocytosis in Alzheimer's Disease Involves Ubiquitination of the Tyrosine Phosphatase STEP61. The Journal of Neuroscience. https://doi.org/10.1523/jneurosci.0157-10.2010

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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