Cited by 362Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

mTOR regulates tau phosphorylation and degradation: implications for Alzheimer's disease and other tauopathies

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Caccamo, Antonella, Magrì, Andrea, Medina, David X., Wisely, Elena V., López‐Aranda, Manuel F., Silva, Alcino J., Oddo, Salvatore·2013·Aging Cell

Abstract

Summary: Accumulation of tau is a critical event in several neurodegenerative disorders, collectively known as tauopathies, which include Alzheimer's disease and frontotemporal dementia. Pathological tau is hyperphosphorylated and aggregates to form neurofibrillary tangles. The molecular mechanisms leading to tau accumulation remain unclear and more needs to be done to elucidate them. Age is a major risk factor for all tauopathies, suggesting that molecular changes contributing to the aging process may facilitate tau accumulation and represent common mechanisms across different tauopathies. Here, we use multiple animal models and complementary genetic and pharmacological approaches to show that the mammalian target of rapamycin (mTOR) regulates tau phosphorylation and degradation. Specifically, we show that genetically increasing mTOR activity elevates endogenous mouse tau levels and phosphorylation. Complementary to it, we further demonstrate that pharmacologically reducing mTOR signaling with rapamycin ameliorates tau pathology and the associated behavioral deficits in a mouse model overexpressing mutant human tau. Mechanistically, we provide compelling evidence that the association between mTOR and tau is linked to GSK3β and autophagy function. In summary, we show that increasing mTOR signaling facilitates tau pathology, while reducing mTOR signaling ameliorates tau pathology. Given the overwhelming evidence that reducing mTOR signaling increases lifespan and healthspan, the data presented here have profound clinical implications for aging and tauopathies and provide the molecular basis for how aging may contribute to tau pathology. Additionally, these results provide preclinical data indicating that reducing mTOR signaling may be a valid therapeutic approach for tauopathies.

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  • Tau hyperphosphorylation resulting from seizure-associated GSK-3β upregulation may be further exacerbated by GSK-3β-mediated mTOR activation.

    “tau hyperphosphorylation resulting from seizure-associated GSK-3β upregulation may be further exacerbated by GSK-3β-mediated mTOR activation (Caccamo et al., 2013; Figure 2).”

    From Tauopathy and Epilepsy Comorbidities and Underlying Mechanisms (2022) · cites this paper as Caccamo et al., 2013

    The Results (page unavailable) report that increasing mTOR signaling increases tau phosphorylation through a GSK-3β-mediated mechanism. They do not show that GSK-3β activates mTOR; the proposed direction of that link is reversed. The paper also does not establish seizure-associated GSK-3β upregulation, although the Discussion mentions epilepsy as a feature of tuberous sclerosis. (LLM, conf=0.88)

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  • In seizure disorders such as tuberous sclerosis complex and Niemann-Pick type C disease characterized by autophagy dysregulation, an increase in normal tau levels may in turn contribute to both seizure activity and PTEN inhibition, creating a feedback loop of mTOR overactivation that results in further hyperphosphorylation of tau.

    “In seizure disorders such as TSC and NPC that are characterized by autophagy dysregulation (Pacheco et al., 2009; Caccamo et al., 2013), increase in normal tau levels may in turn contribute to both seizure activity and PTEN inhibition, creating a feedback loop of mTOR overactivation that results in further hyperphosphorylation of tau (Figure 3).”

    From Tauopathy and Epilepsy Comorbidities and Underlying Mechanisms (2022) · cites this paper as Caccamo et al., 2013

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  • Reduced autophagy resulting from mTOR overactivation is implicated in elevated endogenous tau levels in the TSC2 mouse model of tuberous sclerosis complex.

    “Furthermore, reduced autophagy resulting from mTOR overactivation is implicated in elevated endogenous tau levels in the TSC2 mouse model of TSC (Caccamo et al., 2013).”

    From Tauopathy and Epilepsy Comorbidities and Underlying Mechanisms (2022) · cites this paper as Caccamo et al., 2013

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Research works printed but not linked: 31

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Authors
Caccamo, A., Magrì, A., Medina, D. X., Wisely, E. V., López‐Aranda, M. F., Silva, A. J., & Oddo, S.
Affiliations
  • The University of Texas at San Antonio Health Science Center (US)
  • University of California, Los Angeles (US)
Corresponding author
Oddo, Salvatore
Venue
Aging Cell
Publisher
Wiley
Published
2013-03-24
Volume
12
Issue
3
Pages
370-380
ISSN
  • 1474-9718 (ISSN-L)
  • 1474-9726
OpenAlex
W2011134915
Cited by
362
References
11
Citations by year
2026: 21 · 2025: 23 · 2024: 19 · 2023: 22 · 2022: 24 · 2021: 31 · 2020: 35 · 2019: 35 · 2018: 33 · 2017: 27 · 2016: 22 · 2015: 33 · 2014: 26 · 2013: 11
FWCI
21.35
Type
journal article
Language
en
Open access
Locations
  • Aging Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • Repositorio Institucional de la Universidad de Málaga (University of Málaga) (submittedVersion, other-oa)
Funders
  • Glenn Foundation for Medical Research
  • National Institute on Aging (F30AG043248, R01AG037637)
  • National Institute of Mental Health (R01MH084315)
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
mTOR signaling, tau phosphorylation, tau degradation, tauopathy, Alzheimer's disease, frontotemporal dementia, GSK3β, autophagy, rapamycin, neurofibrillary tangles, aging, healthspan, therapeutic target
MeSH terms
Glycogen Synthase Kinase 3 beta, Tuberous Sclerosis Complex 1 Protein, Tuberous Sclerosis Complex 2 Protein, Alzheimer Disease, Animals, Autophagy, Disease Models, Animal, Humans, Immunosuppressive Agents, Mice, Transgenic, Microtubules, Phosphorylation, Up-Regulation, Amyloid beta-Peptides, Neurofibrillary Tangles, tau Proteins, Sirolimus, Tauopathies, Tumor Suppressor Proteins, Glycogen Synthase Kinase 3, Mice, Frontotemporal Dementia, TOR Serine-Threonine Kinases

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