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Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch.

Publication ,  Journal Article
Xu, Y; Koch, SC; Chamessian, A; He, Q; Sundukova, M; Heppenstall, P; Ji, R; Fitzgerald, M; Beggs, S
Published in: J Neurosci
January 10, 2024

Sensory systems are shaped in postnatal life by the refinement of synaptic connectivity. In the dorsal horn of the spinal cord, somatosensory circuits undergo postnatal activity-dependent reorganization, including the refinement of primary afferent A-fiber terminals from superficial to deeper spinal dorsal horn laminae which is accompanied by decreases in cutaneous sensitivity. Here, we show in the mouse that microglia, the resident immune cells in the CNS, phagocytose A-fiber terminals in superficial laminae in the first weeks of life. Genetic perturbation of microglial engulfment during the initial postnatal period in either sex prevents the normal process of A-fiber refinement and elimination, resulting in an altered sensitivity of dorsal horn cells to dynamic tactile cutaneous stimulation, and behavioral hypersensitivity to dynamic touch. Thus, functional microglia are necessary for the normal postnatal development of dorsal horn sensory circuits. In the absence of microglial engulfment, superfluous A-fiber projections remain in the dorsal horn, and the balance of sensory connectivity is disrupted, leading to lifelong hypersensitivity to dynamic touch.

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Published In

J Neurosci

DOI

EISSN

1529-2401

Publication Date

January 10, 2024

Volume

44

Issue

2

Location

United States

Related Subject Headings

  • Touch Perception
  • Touch
  • Spinal Cord Dorsal Horn
  • Spinal Cord
  • Posterior Horn Cells
  • Neurology & Neurosurgery
  • Nerve Fibers, Myelinated
  • Microglia
  • Mice
  • Animals
 

Citation

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Xu, Y., Koch, S. C., Chamessian, A., He, Q., Sundukova, M., Heppenstall, P., … Beggs, S. (2024). Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch. J Neurosci, 44(2). https://doi.org/10.1523/JNEUROSCI.1354-23.2023
Xu, Yajing, Stephanie C. Koch, Alexander Chamessian, Qianru He, Mayya Sundukova, Paul Heppenstall, RuRong Ji, Maria Fitzgerald, and Simon Beggs. “Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch.J Neurosci 44, no. 2 (January 10, 2024). https://doi.org/10.1523/JNEUROSCI.1354-23.2023.
Xu Y, Koch SC, Chamessian A, He Q, Sundukova M, Heppenstall P, et al. Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch. J Neurosci. 2024 Jan 10;44(2).
Xu, Yajing, et al. “Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch.J Neurosci, vol. 44, no. 2, Jan. 2024. Pubmed, doi:10.1523/JNEUROSCI.1354-23.2023.
Xu Y, Koch SC, Chamessian A, He Q, Sundukova M, Heppenstall P, Ji R, Fitzgerald M, Beggs S. Microglial Refinement of A-Fiber Projections in the Postnatal Spinal Cord Dorsal Horn Is Required for Normal Maturation of Dynamic Touch. J Neurosci. 2024 Jan 10;44(2).

Published In

J Neurosci

DOI

EISSN

1529-2401

Publication Date

January 10, 2024

Volume

44

Issue

2

Location

United States

Related Subject Headings

  • Touch Perception
  • Touch
  • Spinal Cord Dorsal Horn
  • Spinal Cord
  • Posterior Horn Cells
  • Neurology & Neurosurgery
  • Nerve Fibers, Myelinated
  • Microglia
  • Mice
  • Animals