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Published in: Molecular Pain 1/2009

Open Access 01-12-2009 | Research

Upregulation of casein kinase 1ε in dorsal root ganglia and spinal cord after mouse spinal nerve injury contributes to neuropathic pain

Authors: Eri Sakurai, Takashi Kurihara, Kasumi Kouchi, Hironao Saegusa, Shuqin Zong, Tsutomu Tanabe

Published in: Molecular Pain | Issue 1/2009

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Abstract

Background

Neuropathic pain is a complex chronic pain generated by damage to, or pathological changes in the somatosensory nervous system. Characteristic features of neuropathic pain are allodynia, hyperalgesia and spontaneous pain. Such abnormalities associated with neuropathic pain state remain to be a significant clinical problem. However, the neuronal mechanisms underlying the pathogenesis of neuropathic pain are complex and still poorly understood. Casein kinase 1 is a serine/threonine protein kinase and has been implicated in a wide range of signaling activities such as cell differentiation, proliferation, apoptosis, circadian rhythms and membrane transport. In mammals, the CK1 family consists of seven members (α, β, γ1, γ2, γ3, δ, and ε) with a highly conserved kinase domain and divergent amino- and carboxy-termini.

Results

Preliminary cDNA microarray analysis revealed that the expression of the casein kinase 1 epsilon (CK1ε) mRNA in the spinal cord of the neuropathic pain-resistant N- type Ca2+ channel deficient (Ca v 2.2-/-) mice was decreased by the spinal nerve injury. The same injury exerted no effects on the expression of CK1ε mRNA in the wild-type mice. Western blot analysis of the spinal cord identified the downregulation of CK1ε protein in the injured Ca v 2.2-/- mice, which is consistent with the data of microarray analysis. However, the expression of CK1ε protein was found to be up-regulated in the spinal cord of injured wild-type mice. Immunocytochemical analysis revealed that the spinal nerve injury changed the expression profiles of CK1ε protein in the dorsal root ganglion (DRG) and the spinal cord neurons. Both the percentage of CK1ε-positive neurons and the expression level of CK1ε protein were increased in DRG and the spinal cord of the neuropathic mice. These changes were reversed in the spinal cord of the injured Ca v 2.2-/- mice. Furthermore, intrathecal administration of a CK1 inhibitor IC261 produced marked anti-allodynic and anti-hyperalgesic effects on the neuropathic mice. In addition, primary afferent fiber-evoked spinal excitatory responses in the neuropathic mice were reduced by IC261.

Conclusions

These results suggest that CK1ε plays important physiological roles in neuropathic pain signaling. Therefore CK1ε is a useful target for analgesic drug development.
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Metadata
Title
Upregulation of casein kinase 1ε in dorsal root ganglia and spinal cord after mouse spinal nerve injury contributes to neuropathic pain
Authors
Eri Sakurai
Takashi Kurihara
Kasumi Kouchi
Hironao Saegusa
Shuqin Zong
Tsutomu Tanabe
Publication date
01-12-2009
Publisher
BioMed Central
Published in
Molecular Pain / Issue 1/2009
Electronic ISSN: 1744-8069
DOI
https://doi.org/10.1186/1744-8069-5-74

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