Cited by 155Genetics and Neurodevelopmental DisordersNeuroscience and Neuropharmacology ResearchAutism Spectrum Disorder Research

Genetic removal of matrix metalloproteinase 9 rescues the symptoms of fragile X syndrome in a mouse model

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Sidhu, H., Dansie, L. E., Hickmott, P. W., Ethell, D. W., Ethell, I. M.·2014·Journal of Neuroscience

Abstract

Fmr1 knock-out (ko) mice display key features of fragile X syndrome (FXS), including delayed dendritic spine maturation and FXS-associated behaviors, such as poor socialization, obsessive-compulsive behavior, and hyperactivity. Here we provide conclusive evidence that matrix metalloproteinase-9 (MMP-9) is necessary to the development of FXS-associated defects in Fmr1 ko mice. Genetic disruption of Mmp-9 rescued key aspects of Fmr1 deficiency, including dendritic spine abnormalities, abnormal mGluR5-dependent LTD, as well as aberrant behaviors in open field and social novelty tests. Remarkably, MMP-9 deficiency also corrected non-neural features of Fmr1 deficiency-specifically macroorchidism-indicating that MMP-9 dysregulation contributes to FXS-associated abnormalities outside the CNS. Further, MMP-9 deficiency suppressed elevations of Akt, mammalian target of rapamycin, and eukaryotic translation initiation factor 4E phosphorylation seen in Fmr1 ko mice, which are also associated with other autistic spectrum disorders. These findings establish that MMP-9 is critical to the mechanisms responsible for neural and non-neural aspects of the FXS phenotype.

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Authors
Sidhu, H., Dansie, L. E., Hickmott, P. W., Ethell, D. W., & Ethell, I. M.
Affiliations
  • University of California, Riverside (US)
  • Western University of Health Sciences (US)
Venue
Journal of Neuroscience
Published
2014-07-23
Volume
34
Issue
30
Pages
9867-9879
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2083945553
Cited by
155
References
90
Citations by year
2026: 2 · 2025: 5 · 2024: 6 · 2023: 13 · 2022: 13 · 2021: 15 · 2020: 6 · 2019: 14 · 2018: 15 · 2017: 22 · 2016: 18 · 2015: 23 · 2014: 3
FWCI
14.41
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • FRAXA Research Foundation
  • California Institute for Regenerative Medicine
  • National Institutes of Health
  • National Institute of Mental Health (R01MH067121, MH 67121)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Autism Spectrum Disorder Research
Keywords
fragile X syndrome, MMP-9, Fmr1 knockout mice, dendritic spine maturation, social behavior, macroorchidism, Akt signaling, mTOR signaling, eIF4E phosphorylation, autism spectrum disorder, genetic rescue
MeSH terms
Animals, Animals, Newborn, Cells, Cultured, Disease Models, Animal, Fragile X Syndrome, Male, Phenotype, Mice, Knockout, Matrix Metalloproteinase 9, Mice, Mice, 129 Strain

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