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Published in: Journal of Neuroinflammation 1/2011

Open Access 01-12-2011 | Research

Inhibition of spinal astrocytic c-Jun N-terminal kinase (JNK) activation correlates with the analgesic effects of ketamine in neuropathic pain

Authors: Xiao-Peng Mei, Hui Zhang, Wei Wang, Yan-Yan Wei, Ming-Zhu Zhai, Wen Wang, Li-Xian Xu, Yun-Qing Li

Published in: Journal of Neuroinflammation | Issue 1/2011

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Abstract

Background

We have previously reported that inhibition of astrocytic activation contributes to the analgesic effects of intrathecal ketamine on spinal nerve ligation (SNL)-induced neuropathic pain. However, the underlying mechanisms are still unclear. c-Jun N-terminal kinase (JNK), a member of mitogen-activated protein kinase (MAPK) family, has been reported to be critical for spinal astrocytic activation and neuropathic pain development after SNL. Ketamine can decrease lipopolysaccharide (LPS)-induced phosphorylated JNK (pJNK) expression and could thus exert its anti-inflammatory effect. We hypothesized that inhibition of astrocytic JNK activation might be involved in the suppressive effect of ketamine on SNL-induced spinal astrocytic activation.

Methods

Immunofluorescence histochemical staining was used to detect SNL-induced spinal pJNK expression and localization. The effects of ketamine on SNL-induced mechanical allodynia were confirmed by behavioral testing. Immunofluorescence histochemistry and Western blot were used to quantify the SNL-induced spinal pJNK expression after ketamine administration.

Results

The present study showed that SNL induced ipsilateral pJNK up-regulation in astrocytes but not microglia or neurons within the spinal dorsal horn. Intrathecal ketamine relieved SNL-induced mechanical allodynia without interfering with motor performance. Additionally, intrathecal administration of ketamine attenuated SNL-induced spinal astrocytic JNK activation in a dose-dependent manner, but not JNK protein expression.

Conclusions

The present results suggest that inhibition of JNK activation may be involved in the suppressive effects of ketamine on SNL-induced spinal astrocyte activation. Therefore, inhibition of spinal JNK activation may be involved in the analgesic effects of ketamine on SNL-induced neuropathic pain.
Appendix
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Metadata
Title
Inhibition of spinal astrocytic c-Jun N-terminal kinase (JNK) activation correlates with the analgesic effects of ketamine in neuropathic pain
Authors
Xiao-Peng Mei
Hui Zhang
Wei Wang
Yan-Yan Wei
Ming-Zhu Zhai
Wen Wang
Li-Xian Xu
Yun-Qing Li
Publication date
01-12-2011
Publisher
BioMed Central
Published in
Journal of Neuroinflammation / Issue 1/2011
Electronic ISSN: 1742-2094
DOI
https://doi.org/10.1186/1742-2094-8-6

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