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Published in: Molecular Pain 1/2011

Open Access 01-12-2011 | Research

PKMζ is essential for spinal plasticity underlying the maintenance of persistent pain

Authors: Andre Laferrière, Mark H Pitcher, Anne Haldane, Yue Huang, Virginia Cornea, Naresh Kumar, Todd C Sacktor, Fernando Cervero, Terence J Coderre

Published in: Molecular Pain | Issue 1/2011

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Abstract

Background

Chronic pain occurs when normally protective acute pain becomes pathologically persistent. We examined here whether an isoform of protein kinase C (PKC), PKMζ, that underlies long-term memory storage in various brain regions, also sustains nociceptive plasticity in spinal cord dorsal horn (SCDH) mediating persistent pain.

Results

Cutaneous injury or spinal stimulation produced persistent increases of PKMζ, but not other atypical PKCs in SCDH. Inhibiting spinal PKMζ, but not full-length PKCs, reversed plasticity-dependent persistent painful responses to hind paw formalin and secondary mechanical hypersensitivity and SCDH neuron sensitization after hind paw capsaicin, without affecting peripheral sensitization-dependent primary heat hypersensitivity after hind paw capsaicin. Inhibiting spinal PKMζ, but not full-length PKCs, also reversed mechanical hypersensitivity in the rat hind paw induced by spinal stimulation with intrathecal dihydroxyphenylglycine. Spinal PKMζ inhibition also alleviated allodynia 3 weeks after ischemic injury in rats with chronic post-ischemia pain (CPIP), at a point when allodynia depends on spinal changes. In contrast, spinal PKMζ inhibition did not affect allodynia in rats with chronic contriction injury (CCI) of the sciatic nerve, or CPIP rats early after ischemic injury, when allodynia depends on ongoing peripheral inputs.

Conclusions

These results suggest spinal PKMζ is essential for the maintenance of persistent pain by sustaining spinal nociceptive plasticity.
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Metadata
Title
PKMζ is essential for spinal plasticity underlying the maintenance of persistent pain
Authors
Andre Laferrière
Mark H Pitcher
Anne Haldane
Yue Huang
Virginia Cornea
Naresh Kumar
Todd C Sacktor
Fernando Cervero
Terence J Coderre
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Molecular Pain / Issue 1/2011
Electronic ISSN: 1744-8069
DOI
https://doi.org/10.1186/1744-8069-7-99

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