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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Induction of CX3CL1 expression in astrocytes and CX3CR1 in microglia in the spinal cord of a rat model of neuropathic pain.

Previous studies have shown that chemokines might play a role in the pathology of chronic pain. The purpose of this study was to provide an immunohistochemical description of the distribution of CX3CL1 (fractalkine) and its receptor CX3CR1 in the rat spinal cord in a model of inflammatory pain induced by unilateral intraplantar complete Freund's adjuvant (CFA) and in a model of neuropathic pain induced by L5 spinal nerve ligation (modified Chung model or mSNL). In naïve rats, CX3CL1 is found in the cytoplasm of neurons as shown by colocalization of CX3XL1 and NeuN. Similar distribution of CX3CL1 was observed after CFA, whereas after mSNL, CX3CL1 was not only observed in neurons but also found in astrocytes, as shown by colocalization of CX3CL1 and GFAP. Weak immunoreactivity for the CX3CL1 receptor, CX3CR1, was found in microglia in the spinal cord of either naïve rats or rats with inflammation. However, after spinal nerve injury, CX3CR1-LI was upregulated in microglia throughout the dorsal horn. PERSPECTIVE: This study shows that spinal nerve injury, but not peripheral inflammation, induces the expression of a chemokine, CX3CL1 (fractalkine), in astrocytes and upregulates CX3CR1 in microglia in the spinal cord. This selective regulation of CX3CL1 and its receptor, CX3CR1, suggests that these chemokines may represent new targets for the treatment of neuropathic pain.[1]

References

  1. Induction of CX3CL1 expression in astrocytes and CX3CR1 in microglia in the spinal cord of a rat model of neuropathic pain. Lindia, J.A., McGowan, E., Jochnowitz, N., Abbadie, C. The journal of pain : official journal of the American Pain Society. (2005) [Pubmed]
 
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