Cited by 177Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsNeurogenesis and neuroplasticity mechanisms

The PI3K-Akt-mTOR pathway regulates Aβ oligomer induced neuronal cell cycle events

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Bhaskar, Kiran, Miller, Megan, Chludzinski, Alexandra, Herrup, Karl, Zagorski, Michael, Lamb, Bruce T·2009·Molecular Neurodegeneration

Abstract

Accumulating evidence suggests that neurons prone to degeneration in Alzheimer's Disease (AD) exhibit evidence of re-entry into an aberrant mitotic cell cycle. Our laboratory recently demonstrated that, in a genomic amyloid precursor protein ( APP ) mouse model of AD (R1.40), neuronal cell cycle events (CCEs) occur in the absence of beta-amyloid (Aβ) deposition and are still dependent upon the amyloidogenic processing of the amyloid precursor protein (APP). These data suggested that soluble Aβ species might play a direct role in the induction of neuronal CCEs. Here, we show that exposure of non-transgenic primary cortical neurons to Aβ oligomers, but not monomers or fibrils, results in the retraction of neuronal processes, and induction of CCEs in a concentration dependent manner. Retraction of neuronal processes correlated with the induction of CCEs and the Aβ monomer or Aβ fibrils showed only minimal effects. In addition, we provide evidence that induction of neuronal CCEs are autonomous to primary neurons cultured from the R1.40 mice. Finally, our results also demonstrate that Aβ oligomer treated neurons exhibit elevated levels of activated Akt and mTOR (mammalian T arget O f R apamycin) and that PI3K, Akt or mTOR inhibitors blocked Aβ oligomer-induced neuronal CCEs. Taken together, these results demonstrate that Aβ oligomer-based induction of neuronal CCEs involve the PI3K-Akt-mTOR pathway.

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  • In AD and DS-AD, increased Aβ accumulation activates the PI3K/Akt signaling pathway, contributing to hyperactivation of mTORC1.

    “In AD and DS‐AD, increased Aβ accumulation activates the PI3K/Akt signaling pathway, contributing to hyperactivation of mTORC1. 11”

    From Disruption of hippocampal upstream regulators of mTOR and insulin pathways in Down syndrome with Alzheimer's disease neuropathology: Preliminary observations (2026) · cites this paper as [11]

    The Results section (page not specified) says Aβ oligomers activate PI3K–Akt–mTOR signaling, and the Discussion reports increased Akt and mTOR phosphorylation after oligomer exposure in cultured neurons. The paper also describes altered signaling in AD brains, but it does not establish this mechanism in DS-AD or specifically identify hyperactivation of mTORC1. Its experimental finding concerns Aβ oligomer exposure, not increased Aβ accumulation generally. (LLM, conf=0.87)

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Authors
Bhaskar, K., Miller, M., Chludzinski, A., Herrup, K., Zagorski, M., & Lamb, B. T.
Affiliations
  • Cleveland Clinic (US)
  • Case Western Reserve University (US)
  • Cleveland Clinic Lerner College of Medicine (US)
  • Rutgers, The State University of New Jersey (US)
Corresponding author
Lamb, Bruce T
Venue
Molecular Neurodegeneration
Published
2009-03-16
Volume
4
Issue
1
Pages
14-14
ISSN
1750-1326 (ISSN-L)
OpenAlex
W1989723191
Cited by
177
References
11
Citations by year
2026: 5 · 2025: 9 · 2024: 7 · 2023: 8 · 2022: 5 · 2021: 18 · 2020: 14 · 2019: 12 · 2018: 6 · 2017: 10 · 2016: 12 · 2015: 14 · 2014: 13 · 2013: 11 · 2012: 11
FWCI
7.31
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Molecular Neurodegeneration (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
  • Rare & Special e-Zone (The Hong Kong University of Science and Technology) (submittedVersion)
Funders
  • Alzheimer's Association
  • Northwestern University
  • National Institutes of Health (AG023012)
  • National Institute on Aging (R01AG023012, R01AG027853, R01AG024494)
  • National Institute of Neurological Disorders and Stroke (R01NS020591)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
PI3K/AKT/mTOR pathway, amyloid-beta oligomers, neuronal cell cycle re-entry, Alzheimer's disease, amyloid precursor protein, cortical neurons, Akt activation, mTOR activation, PI3K inhibitors, APP processing

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