The astrocyte-targeted therapy by Bushi for the neuropathic pain in mice
PLoS ONE, ISSN: 1932-6203, Vol: 6, Issue: 8, Page: e23510
2011
- 62Citations
- 69Captures
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Metrics Details
- Citations62
- Citation Indexes62
- 62
- CrossRef34
- Captures69
- Readers69
- 69
Article Description
Background: There is accumulating evidence that the activation of spinal glial cells, especially microglia, is a key event in the pathogenesis of neuropathic pain. However, the inhibition of microglial activation is often ineffective, especially for long-lasting persistent neuropathic pain. So far, neuropathic pain remains largely intractable and a new therapeutic strategy for the pain is still required. Methods/Principal Findings: Using Seltzer model mice, we investigated the temporal aspect of two types of neuropathic pain behaviors, i.e., thermal hyperalgesia and mechanical allodynia, as well as that of morphological changes in spinal microglia and astrocytes by immunohistochemical studies. Firstly, we analyzed the pattern of progression in the pain behaviors, and found that the pain consisted of an "early induction phase" and subsequent "late maintenance phase". We next analyzed the temporal changes in spinal glial cells, and found that the induction and the maintenance phase of pain were associated with the activation of microglia and astrocytes, respectively. When Bushi, a Japanese herbal medicine often used for several types of persistent pain, was administered chronically, it inhibited the maintenance phase of pain without affecting the induction phase, which was in accordance with the inhibition of astrocytic activation in the spinal cord. These analgesic effects and the inhibition of astrocytic activation by Bushi were mimicked by the intrathecal injection of fluorocitrate, an inhibitor of astrocytic activation. Finally, we tested the direct effect of Bushi on astrocytic activation, and found that Bushi suppressed the IL-1β- or IL-18-evoked ERK1/2-phosphorylation in cultured astrocytes but not the ATP-evoked p38- and ERK1/2-phosphorylation in microglia in vitro. Conclusions: Our results indicated that the activation of spinal astrocytes was responsible for the late maintenance phase of neuropathic pain in the Seltzer model mice and, therefore, the inhibition of astrocytic activation by Bushi could be a useful therapeutic strategy for treating neuropathic pain. © 2011 Shibata et al.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=80051843478&origin=inward; http://dx.doi.org/10.1371/journal.pone.0023510; http://www.ncbi.nlm.nih.gov/pubmed/21876755; https://dx.plos.org/10.1371/journal.pone.0023510; https://dx.doi.org/10.1371/journal.pone.0023510; https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0023510
Public Library of Science (PLoS)
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