Cited by 64Genetics and Neurodevelopmental DisordersNeuroscience and Neuropharmacology ResearchAutism Spectrum Disorder Research

Delayed maturation of fast-spiking interneurons is rectified by activation of the TrkB receptor in the mouse model of fragile X syndrome.

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Nomura, Toshihiro, Musial, Timothy F., Marshall, John J., Zhu, Yiwen, Remmers, Christine L., Xu, Jian, Nicholson, Daniel A., Contractor, Anis·2017·The Journal of Neuroscience

Abstract

Fragile X syndrome (FXS) is a neurodevelopmental disorder that is a leading cause of inherited intellectual disability, and the most common known cause of autism spectrum disorder. FXS is broadly characterized by sensory hypersensitivity and several developmental alterations in synaptic and circuit function have been uncovered in the sensory cortex of the mouse model of FXS (Fmr1 KO). GABA-mediated neurotransmission and fast-spiking (FS) GABAergic interneurons are central to cortical circuit development in the neonate. Here we demonstrate that there is a delay in the maturation of the intrinsic properties of FS interneurons in the sensory cortex, and a deficit in the formation of excitatory synaptic inputs on to these neurons in neonatal Fmr1 KO mice. Both these delays in neuronal and synaptic maturation were rectified by chronic administration of a TrkB receptor agonist. These results demonstrate that the maturation of the GABAergic circuit in the sensory cortex is altered during a critical developmental period due in part to a perturbation in BDNF-TrkB signaling, and could contribute to the alterations in cortical development underlying the sensory pathophysiology of FXS. SIGNIFICANCE STATEMENT Fragile X (FXS) individuals have a range of sensory related phenotypes, and there is growing evidence of alterations in neuronal circuits in the sensory cortex of the mouse model of FXS (Fmr1 KO). GABAergic interneurons are central to the correct formation of circuits during cortical critical periods. Here we demonstrate a delay in the maturation of the properties and synaptic connectivity of interneurons in Fmr1 KO mice during a critical period of cortical development. The delays both in cellular and synaptic maturation were rectified by administration of a TrkB receptor agonist, suggesting reduced BDNF-TrkB signaling as a contributing factor. These results provide evidence that the function of fast-spiking interneurons is disrupted due to a deficiency in neurotrophin signaling during early development in FXS.

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Authors
Nomura, T., Musial, T. F., Marshall, J. J., Zhu, Y., Remmers, C. L., Xu, J., Nicholson, D. A., & Contractor, A.
Affiliations
  • Northwestern University (US)
  • Rush University Medical Center (US)
Venue
The Journal of Neuroscience
Published
2017-10-16
Volume
37
Issue
47
Pages
11298-11310
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2766135107
Cited by
64
References
58
Citations by year
2026: 2 · 2025: 5 · 2024: 12 · 2023: 5 · 2022: 7 · 2021: 8 · 2020: 11 · 2019: 5 · 2018: 9
FWCI
4.53
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Defense (W81XWH, W81XWH-13-ARP-IDA, W81XWH-13)
  • Northwestern University
  • National Institutes of Health (W81XWH)
  • National Institute on Aging (R01AG047073, K02AG050767)
  • National Institute of Mental Health (MH099114, R01MH099114, R21MH104808)
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, Fmr1 knockout mice, fast-spiking interneurons, BDNF/TrkB signaling, sensory cortex, cortical development, critical period, GABAergic circuits, synapse maturation, excitatory synaptic input, neurotrophin signaling, sensory hypersensitivity
MeSH terms
Animals, Female, Fragile X Syndrome, Interneurons, Mice, Inbred C57BL, Somatosensory Cortex, Excitatory Postsynaptic Potentials, Receptor, trkB, Mice, Fragile X Messenger Ribonucleoprotein 1, GABAergic Neurons

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