Abstract
We performed a study on the antinociceptive effects of A1 and A2 type (A1LL and A2NTX, respectively) botulinum toxin on carrageenan-induced hyperalgesia in the rat. Both A1LL and A2NTX had antinociceptive effects in the carrageenan-induced inflammatory pain model, reducing the mechanical and thermal hyperalgesia. A2NTX also reduced the increase in c-fos immunoreactivity in L4–L5 spinal segments induced by carrageenan, suggesting that A2NTX inhibits the activation of spinal nociceptive afferent fibers that project to the CNS. Our results indicate that A2NTX may offer a new therapeutic tool to treat inflammatory pain.
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