期刊
BRAIN RESEARCH
卷 1465, 期 -, 页码 1-9出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2012.05.020
关键词
Bone cancer pain; CX3CR1; Microglia; p38 MAP kinase; Spinal cord
资金
- National Natural Science Fund of China (NSFC) [81000479, 81171057]
- NSFC for Distinguished Young Scholars [30872442]
- Natural Science Fund of Jiangsu Province [BK2011305]
- Department of Health Fund of Jiangsu Province [H200917]
- Science and Technology Fund of Suzhou City [ZS0901]
Previous studies have demonstrated that fractalkine, a newly discovered chemokine, is implicated in spinal cord neuron-to-microglia activation signaling as well as mediation of neuropathic and inflammatory pain via its sole receptor CX3CR1, which is specifically expressed on microglia. However, whether it is involved in bone cancer pain (BCP) and the underlying mechanisms have not been elucidated. In this study we utilized a Sprague-Dawley rat animal model, and our findings indicated that on day 6, 12, and 18 following bone cancer pain induced by Walker 256 cell inoculation, the expression level of CX3CR1 in the spinal cord gradually increased. Intrathecal injection of a neutralizing antibody against CX3CR1 not only delayed the initiation of mechanical allodynia, but also attenuated established pain sensitization of BCP rats. Furthermore, we demonstrated that blockade of CX3CR1 suppressed the activation of microglia and the expression of p38 mitogen-activated protein kinase (MAPK) in the spinal cord in BCP rats. These results suggest a new mechanism of BCP, in which the microglia CX3CR1/p38 signaling cascade potentially plays an important role in facilitating pain processing in BCP rats. (C) 2012 Elsevier B.V. All rights reserved.
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