Cited by 83Alzheimer's disease research and treatmentsNeuroinflammation and Neurodegeneration MechanismsDementia and Cognitive Impairment Research

mTOR and neuronal cell cycle reentry: how impaired brain insulin signaling promotes Alzheimer's disease

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Norambuena, Andrés, Wallrabe, Horst, McMahon, Lloyd, Silva, Antonia, Swanson, Eric, Khan, Shahzad S., Baerthlein, Daniel, Kodis, Erin +3 more·2017·Alzheimer's & Dementia

Abstract

A major obstacle to presymptomatic diagnosis and disease‐modifying therapy for Alzheimer's disease (AD) is inadequate understanding of molecular mechanisms of AD pathogenesis. For example, impaired brain insulin signaling is an AD hallmark, but whether and how it might contribute to the synaptic dysfunction and neuron death that underlie memory and cognitive impairment has been mysterious. Neuron death in AD is often caused by cell cycle reentry (CCR) mediated by amyloid‐β oligomers (AβOs) and tau, the precursors of plaques and tangles. We now report that CCR results from AβO‐induced activation of the protein kinase complex, mTORC1, at the plasma membrane and mTORC1‐dependent tau phosphorylation, and that CCR can be prevented by insulin‐stimulated activation of lysosomal mTORC1. AβOs were also shown previously to reduce neuronal insulin signaling. Our data therefore indicate that the decreased insulin signaling provoked by AβOs unleashes their toxic potential to cause neuronal CCR, and by extension, neuron death.

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Crossref · 10.1016/j.jalz.2016.08.015

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  • Hyperactivation of the S6K proteins correlates with increased Tau pathology and dysregulation of the insulin/IGF/mTOR signaling pathway, both in individuals with DS-AD and in idiopathic AD.

    “Hyperactivation of the S6K proteins correlates with increased Tau pathology and dysregulation of the insulin/IGF/mTOR signaling pathway, both in individuals with DS‐AD 55 and in idiopathic AD. 56”

    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 [56]

    For the idiopathic AD portion to which citation 56 is attached, Results §4.5 links mTOR activity to tau phosphorylation, probably through S6K, and Results §4.6 reports tau phosphorylation in human AD tissue. The paper does not report a correlation in those individuals between S6K hyperactivation, increased tau pathology, and dysregulation of the insulin/IGF/mTOR pathway. The DS-AD portion has a separate citation and is not assessed against this source. (LLM, conf=0.84)

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Authors
Norambuena, A., Wallrabe, H., McMahon, L., Silva, A., Swanson, E., Khan, S. S., Baerthlein, D., Kodis, E., Oddo, S., Mandell, J. W., & Bloom, G. S.
Affiliations
  • University of Virginia (US)
  • Department of Biology University of Virginia Charlottesville VA USA
  • Arizona State University (US)
Corresponding author
  • Norambuena, Andrés
  • Bloom, George S.
Venue
Alzheimer's & Dementia
Publisher
Wiley
Published
2016-09-28
Volume
13
Issue
2
Pages
152-167
ISSN
  • 1552-5260 (ISSN-L)
  • 1552-5279
OpenAlex
W2524820045
Cited by
79
References
66
Citations by year
2026: 2 · 2025: 5 · 2024: 7 · 2023: 5 · 2022: 7 · 2021: 13 · 2020: 6 · 2019: 13 · 2018: 13 · 2017: 8
FWCI
9.13
Type
journal article
Language
en
Open access
Locations
  • Alzheimer s & Dementia (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (F31 NS092444)
  • Cure Alzheimer's Fund
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
Keywords
Alzheimer's disease, mTORC1
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Mechanistic Target of Rapamycin Complex 2, Aged, Aged, 80 and over, Alzheimer Disease, Animals, Cell Cycle, Cell Membrane, Cells, Cultured, Cerebral Cortex, Humans, Hydrocephalus, Normal Pressure, Insulin, Lysosomes, Middle Aged, Neurons, Amyloid beta-Peptides, tau Proteins, Mice, Knockout

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