Differential Changes in Neuronal Excitability in the Spinal Dorsal Horn After Spinal Nerve Ligation in Rats

Ryuji Terayama, Yuya Yamamoto, Noriko Kishimoto, Mitsuyasu Tabata, Kotaro Maruhama, Seiji Iida, Tomosada Sugimoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Previous studies demonstrated that peripheral nerve injury induced excessive neuronal response and glial activation in the spinal cord dorsal horn, and such change has been proposed to reflect the development and maintenance of neuropathic pain states. The aim of this study was to examine neuronal excitability and glial activation in the spinal dorsal horn after peripheral nerve injury. We examined noxious heat stimulation-induced c-Fos protein-like immunoreactivity (Fos-LI) neuron profiles in fourth-to-sixth lumbar (L4–L6) level spinal dorsal horn neurons after fifth lumbar spinal nerve ligation (L5 SNL). Immunofluorescence labeling of OX-42 and GFAP was also performed in histological sections of the spinal cord. A significant increase in the number of Fos-LI neuron profiles in the spinal dorsal horn at the L4 level was found at 3 days after SNL, but returned to a level similar to that in sham-operated controls by 14 days after injury. As expected, a decrease in the number of Fos-LI neuron profiles in the spinal dorsal horn at the L5 level was found at 3 days after SNL. However, these profiles had reappeared in large numbers by 14 and 21 days after injury. Immunofluorescence labeling of OX-42 and GFAP indicated sequential activation of microglia and astrocytes in the spinal dorsal horn. We conclude that nerve injury causes differential changes in neuronal excitability in the spinal dorsal horn, which may coincide with glial activation. These changes may play a substantial role in the pathogenesis of neuropathic pain after peripheral nerve injury.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalNeurochemical Research
DOIs
Publication statusAccepted/In press - Jul 14 2016

Fingerprint

Spinal Nerves
Proto-Oncogene Proteins c-fos
Neurons
Ligation
Rats
Chemical activation
Peripheral Nerve Injuries
Neuroglia
Labeling
Neuralgia
Fluorescent Antibody Technique
Wounds and Injuries
Posterior Horn Cells
Microglia
Astrocytes
Spinal Cord Dorsal Horn
Spinal Cord
Hot Temperature
Maintenance

Keywords

  • Astrocyte
  • C-Fos
  • Microglia
  • Nerve injury
  • Spinal dorsal horn

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Biochemistry

Cite this

Differential Changes in Neuronal Excitability in the Spinal Dorsal Horn After Spinal Nerve Ligation in Rats. / Terayama, Ryuji; Yamamoto, Yuya; Kishimoto, Noriko; Tabata, Mitsuyasu; Maruhama, Kotaro; Iida, Seiji; Sugimoto, Tomosada.

In: Neurochemical Research, 14.07.2016, p. 1-10.

Research output: Contribution to journalArticle

Terayama, Ryuji ; Yamamoto, Yuya ; Kishimoto, Noriko ; Tabata, Mitsuyasu ; Maruhama, Kotaro ; Iida, Seiji ; Sugimoto, Tomosada. / Differential Changes in Neuronal Excitability in the Spinal Dorsal Horn After Spinal Nerve Ligation in Rats. In: Neurochemical Research. 2016 ; pp. 1-10.
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