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In this study we investigated the involvement of opioid receptors in the contractile response to trimebutine using with the proximal colon of anesthetized rats. Trimebutine (3 mg/kg i.v.) enhanced spontaneous contractions of the proximal colon in anesthetized rats. The contractile response was partially inhibited by intravenous administration of an opioid antagonist, naloxone at 1 approximately 30 micrograms/kg, but was hardly depressed by intracisternal administration of naloxone (30 micrograms/kg). Morphine (30 micrograms/kg i.v.) evoked colonic contractions which were abolished by intravenous naloxone (30 micrograms/kg). These results suggest that the colonic contractions evoked by trimebutine in anesthetized rats are, in part, mediated by peripheral opioid receptors.

Contribution of peripheral opioid receptors to the trimebutine-induced contractions of the proximal colon in anesthetized rats.