Cited by 48Neuroscience and Neuropharmacology ResearchNeurogenesis and neuroplasticity mechanismsProtease and Inhibitor Mechanisms

Proteolytic regulation of synaptic plasticity in the mouse primary visual cortex: analysis of matrix metalloproteinase 9 deficient mice

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Kelly, Emily A., Russo, Amanda S., Jackson, Cory D., Lamantia, Cassandra E., Majewska, Ania K.·2015·Frontiers in Cellular Neuroscience

Abstract

The extracellular matrix (ECM) is known to play important roles in regulating neuronal recovery from injury. The ECM can also impact physiological synaptic plasticity, although this process is less well understood. To understand the impact of the ECM on synaptic function and remodeling in vivo, we examined ECM composition and proteolysis in a well-established model of experience-dependent plasticity in the visual cortex. We describe a rapid change in ECM protein composition during Ocular Dominance Plasticity (ODP) in adolescent mice, and a loss of ECM remodeling in mice that lack the extracellular protease, matrix metalloproteinase-9 (MMP9). Loss of MMP9 also attenuated functional ODP following monocular deprivation (MD) and reduced excitatory synapse density and spine density in sensory cortex. While we observed no change in the morphology of existing dendritic spines, spine dynamics were altered, and MMP9 knock-out (KO) mice showed increased turnover of dendritic spines over a period of 2 days. We also analyzed the effects of MMP9 loss on microglia, as these cells are involved in extracellular remodeling and have been recently shown to be important for synaptic plasticity. MMP9 KO mice exhibited very limited changes in microglial morphology. Ultrastructural analysis, however, showed that the extracellular space surrounding microglia was increased, with concomitant increases in microglial inclusions, suggesting possible changes in microglial function in the absence of MMP9. Taken together, our results show that MMP9 contributes to ECM degradation, synaptic dynamics and sensory-evoked plasticity in the mouse visual cortex.

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Authors
Kelly, E. A., Russo, A. S., Jackson, C. D., Lamantia, C. E., & Majewska, A. K.
Affiliations
University of Rochester Medicine (US)
Corresponding author
Majewska, Ania K.
Venue
Frontiers in Cellular Neuroscience
Published
2015-09-22
Volume
9
Pages
369-369
ISSN
1662-5102 (ISSN-L)
OpenAlex
W1918225643
Cited by
48
References
110
Citations by year
2026: 1 · 2025: 4 · 2024: 6 · 2023: 2 · 2022: 5 · 2021: 10 · 2020: 6 · 2019: 3 · 2018: 3 · 2017: 6 · 2016: 2
FWCI
1.71
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Frontiers in Cellular Neuroscience (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Eye Institute (EY019277, P30EY001319)
  • National Institute of Environmental Health Sciences (T32 ES 7026-34)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
Keywords
MMP-9, extracellular matrix, synaptic plasticity, ocular dominance plasticity, monocular deprivation, primary visual cortex, dendritic spines, microglia, experience-dependent plasticity, proteolysis, excitatory synapses

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