Abstract

The ( d-Pro 2, d-Trp 7,9) analogue of substance P has been tested for substance P antagonist activity in the caudal trigeminal nucleus in vivo, and in the isolated spinal cord in vitro. In neither case was the analogue found to be a specific antagonist of substance P, although the analogue did have weak antagonist actions in the isolated guinea-pig ileum preparation. It is concluded that the analogue is not a suitable tool for the identification of putative substance P systems in the spinal cord or the caudal trigeminal nucleus of the rat.

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