Pharmacological characterization and gene expression profiling of an L5/L6 spinal nerve ligation model for neuropathic pain in mice

Neuroscience
T KisoN Matsuoka

Abstract

L5/L6 spinal nerve ligation (SNL) in rodents induces behavioral signs similar to the symptoms of neuropathic pain in humans. L5/L6 SNL in rats has been well characterized so far, but there have been few studies using mice. In this study, we established an L5/L6 SNL model in mice and examined the effects of known antinociceptive drugs in the model. We also analyzed the changes in gene expression in dorsal root ganglions with special reference to those which are known to change in a neuropathic pain state to validate the model. Mechanical allodynia in the ipsilateral side paw was observed beginning on day 1 and lasted for at least 2 months following surgery. Diclofenac showed no significant effect on the mechanical allodynia. Gabapentin and pregabalin completely reversed allodynia, but they also caused a decrease in locomotor activity. Duloxetine caused a partial recovery of the threshold. Mexiletine completely reversed allodynia, but it also caused sedation or motor impairment. Morphine caused a partial recovery of the threshold and hyper-locomotion. This mouse L5/L6 SNL model represents a robust mechanical allodynia, which shows a similar pharmacological response to that reported in rats and human patients with neuropathic pain...Continue Reading

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Citations

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