Summary
The effect of unilateral sciatic nerve transection on behavioural responses produced by intrathecal administration of substance P (SP), neurokinin A, eledoisin and physalaemin was investigated in the rat. The injection of SP (3 nmol/rat) into the subarachnoid space was followed by reciprocal scratching, biting and licking of the fore- and hind-limbs. There was no observable difference in the behavioural response to SP between rats with nerve transection and sham operated rats at 5 days after operation. Whereas at 10, 20, and 30 days after nerve transection the response to SP was significantly increased as compared with sham operated rats. This phenomenon was also observed with neurokinin A (1.5, 3.0 and 6.0 nmol/rat), eledoisin (0.05 and 0.10 nmol/rat) and physalaemin (0.05 and 0.10 nmol/ rat) at 10 days after operation. Ipsilateral depletion of SP from the lumbar (L4-L6) spinal cord was observed at 5, 10, 20, and 30 days after the unilateral transection of the sciatic nerve. These results suggest that sciatic nerve transection may produce an increased response to tachykinins through an enhanced sensitivity of tachykinin receptors in the lumbar cord.
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Kuwahara, H., Sakurada, T., Sakurada, S. et al. Behavioural effects of intrathecally injected tachykinins in rats with peripheral nerve transection. Naunyn-Schmiedeberg's Arch Pharmacol 336, 656–660 (1987). https://doi.org/10.1007/BF00165757
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DOI: https://doi.org/10.1007/BF00165757