Cited by 71Genetics and Neurodevelopmental DisordersPI3K/AKT/mTOR signaling in cancerNeuroscience and Neuropharmacology Research

Selective Role of the Catalytic PI3K Subunit p110β in Impaired Higher Order Cognition in Fragile X Syndrome

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Gross, Christina, Raj, Nisha, Molinaro, Gemma, Allen, Amanda G., Whyte, Alonzo J., Gibson, Jay R., Huber, Kimberly M., Gourley, Shannon L. +1 more·2015·Cell Reports

Abstract

Distinct isoforms of the PI3K catalytic subunit have specialized functions in the brain, but their role in cognition is unknown. Here, we show that the catalytic subunit p110β plays an important role in prefrontal cortex (PFC)-dependent cognitive defects in mouse models of Fragile X syndrome (FXS), an inherited intellectual disability. FXS is caused by loss of function of the fragile X mental retardation protein (FMRP), which binds and translationally represses mRNAs. PFC-selective knockdown of p110β, an FMRP target that is translationally upregulated in FXS, reverses deficits in higher cognition in Fmr1 knockout mice. Genetic full-body reduction of p110β in Fmr1 knockout mice normalizes excessive PI3K activity, restores stimulus-induced protein synthesis, and corrects increased dendritic spine density and behavior. Notably, adult-onset PFC-selective Fmr1 knockdown mice show impaired cognition, which is rescued by simultaneous p110β knockdown. Our results suggest that FMRP-mediated control of p110β is crucial for neuronal protein synthesis and cognition.

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  • Downregulation of the PI3K/AKT pathway in Fmr1 null mice ameliorated aberrations in protein synthesis, dendritic spine density and cortical network connectivity.

    “while downregulation of the pathway in Fmr1 null mice ameliorated aberrations in protein synthesis, dendritic spine density and cortical network connectivity [108, 109].”
  • Mutations in Fmr1 and Pten lead to over-activity of the PI3K/AKT pathway with increased synaptogenesis and hyperconnectivity of neurons.

    “while mutations in Fmr1 and Pten lead to the over-activity of PI3K/AKT pathway with increased synaptogenesis and hyperconnectivity of the neurons [107–109]”

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Authors
Gross, C., Raj, N., Molinaro, G., Allen, A. G., Whyte, A. J., Gibson, J. R., Huber, K. M., Gourley, S. L., & Bassell, G. J.
Affiliations
  • Emory University (US)
  • The University of Texas Southwestern Medical Center (US)
Corresponding author
  • Gross, Christina
  • Bassell, Gary J.
Venue
Cell Reports
Publisher
Elsevier BV
Published
2015-05
Volume
11
Issue
5
Pages
681-688
ISSN
2211-1247 (ISSN-L)
OpenAlex
W2096444933
Cited by
71
References
50
Citations by year
2024: 2 · 2023: 2 · 2022: 4 · 2021: 8 · 2020: 10 · 2019: 11 · 2018: 6 · 2017: 7 · 2016: 14 · 2015: 7
FWCI
7.76
Type
journal article
Language
en
Open access
Locations
  • Cell Reports (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health (P51OD011132)
  • National Institute of Mental Health (R21MH103748, MH103748)
  • National Institute of Neurological Disorders and Stroke (R01NS045711, P30NS055077, NS045711)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD056370, R01HD056370)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
fragile X syndrome, p110β, FMRP, prefrontal cortex, higher-order cognition, intellectual disability, Fmr1 knockout mice, dendritic spine density, protein synthesis inhibition, PI3K signaling
MeSH terms
Animals, Behavior, Animal, Cognition, Fragile X Syndrome, Male, Protein Biosynthesis, Prefrontal Cortex, Protein Structure, Tertiary, Mice, Knockout, Dendritic Spines, Mice, Fragile X Messenger Ribonucleoprotein 1, Class Ia Phosphatidylinositol 3-Kinase, Receptor, Metabotropic Glutamate 5

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