Cited by 58Alzheimer's disease research and treatmentsPI3K/AKT/mTOR signaling in cancerAutophagy in Disease and Therapy

mTORC2 (Rictor) in Alzheimer’s Disease and Reversal of Amyloid-β Expression-Induced Insulin Resistance and Toxicity in Rat Primary Cortical Neurons

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Lee, Han-Kyu, Kwon, Bumsup, Lemere, Cynthia A., de la Monte, Suzanne, Itamura, Kyohei, Ha, Austin Y., Querfurth, Henry W.·2017·Journal of Alzheimer's Disease

Abstract

Mammalian target of rapamycin complex 1 (mTORC1), a nutrient sensor and central controller of cell growth and proliferation, is altered in various models of Alzheimer's disease (AD). Even less studied or understood in AD is mammalian target of rapamycin complex 2 (mTORC2) that influences cellular metabolism, in part through the regulations of Akt/PKB and SGK. Dysregulation of insulin/PI3K/Akt signaling is another important feature of AD pathogenesis. We found that both total mTORC1 and C2 protein levels and individual C1 and C2 enzymatic activities were decreased in human AD brain samples. In two rodent AD models, mTORC1 and C2 activities were also decreased. In a neuronal culture model of AD characterized by accumulation of cellular amyloid-β (Aβ)42, mTORC1 activity was reduced. Autophagic vesicles and markers were correspondingly increased and new protein synthesis was inhibited, consistent with mTORC1 hypofunction. Interestingly, mTORC2 activity in neural culture seemed resistant to the effects of intracellular amyloid. In various cell lines, Aβ expression provoked insulin resistance, characterized by inhibition of stimulated Akt phosphorylation, and an increase in negative mTORC1 regular, p-AMPK, itself a nutrient sensor. Rapamycin decreased phospho-mTOR and to lesser degree p-Rictor. This further suppression of mTORC1 activity protected cells from Aβ-induced toxicity and insulin resistance. More striking, Rictor over-expression fully reversed the Aβ-effects on primary neuronal cultures. Finally, using in vitro assay, Rictor protein addition completely overcame oligomeric Aβ-induced inhibition of the PDK-Akt activation step. We conclude that striking a new balance by restoring mTORC2 abundance and/or inhibition of mTORC1 has therapeutic potential in AD.

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Authors
Lee, H.-K., Kwon, B., Lemere, C. A., de la Monte, S., Itamura, K., Ha, A. Y., & Querfurth, H. W.
Affiliations
  • Department of Neurology, Rhode Island Hospital and Brown University Warren Alpert Medical School, Providence, RI, USA
  • Brown University (US)
  • Brigham and Women's Hospital (US)
  • Department of Pathology, Rhode Island Hospital and Brown University Warren Alpert Medical School, Providence, RI, USA
Corresponding author
Querfurth, Henry W.
Venue
Journal of Alzheimer's Disease
Published
2017-02-03
Volume
56
Issue
3
Pages
1015-1036
ISSN
  • 1387-2877 (ISSN-L)
  • 1875-8908
OpenAlex
W2567266077
Cited by
57
References
111
Citations by year
2026: 7 · 2025: 8 · 2024: 9 · 2023: 7 · 2022: 7 · 2021: 4 · 2020: 6 · 2019: 6 · 2018: 2 · 2017: 1
FWCI
2.42
Type
journal article
Language
en
Open access
Locations
  • Journal of Alzheimer s Disease (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • McLean Hospital
  • Bennett Foundation
  • National Institutes of Health
  • National Institute on Alcohol Abuse and Alcoholism (R37AA011431)
  • National Institute on Aging (R44AG049510, R41AG044871)
  • National Institute of Neurological Disorders and Stroke (R01NS136122)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
mTORC2, Rictor
MeSH terms
Mechanistic Target of Rapamycin Complex 1, Mechanistic Target of Rapamycin Complex 2, Aged, Aged, 80 and over, Alzheimer Disease, Animals, Autophagy, Cell Survival, Cells, Cultured, Cerebral Cortex, Female, Humans, Insulin Resistance, Male, Mice, Transgenic, Middle Aged, Neurons, Peptide Fragments, Amyloid beta-Peptides, Rats, Sprague-Dawley, Proto-Oncogene Proteins c-akt

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