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Eur J Pharmacol. 1987 May 7;137(1):85-9.

Diprenorphine has agonist activity at opioid kappa-receptors in the myenteric plexus of the guinea-pig ileum.


The opioid agonist and antagonist activities of diprenorphine have been tested in four in vitro bioassay preparations. Diprenorphine is an antagonist at delta-receptors in the hamster vas deferens, at mu-receptors in the rat vas deferens and at kappa-receptors in the rabbit vas deferens. In the guinea-pig ileum it is an antagonist at mu-receptors and an agonist at kappa-receptors.

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