5-HT3 antagonists reduce morphine self-administration in rats

Oral self-administration of morphine in rats.

Serotonin antagonists fail to alter MDMA self-administration in rats.

Acute exposure to ±3,4-methylenedioxymethamphetamine (MDMA) preferentially increases release of serotonin (5-HT), and a role of 5-HT in many of the behavioral effects of acute exposure to MDMA has been demonstrated. A role of 5-HT in MDMA self-administration in rats has not, however, been adequately determined. Therefore, the present study measured the effect of pharmacological manipulation of ...

how can 5-ht3 receptor antagonists exert analgesic properties?

no abstract

The effect of L-arginine and L-NAME on intravenous self-administration of morphine in rats

  The involvement of nitric oxide (NO) in the reinforcing properties of opiate reward was studied by examining the effect of a NO precursor (L-arginine) and a NO synthase inhibitor (L-NAME) on the rate of intravenous self-administration of morphine. This experiment was investigated in male albino Sprague Dawley rats (300 ± 50 g). At doses of 5 and 10 mg/kg (i.p.), L-arginine decreased morphine ...

5-HT3 receptor antagonists for the treatment of nausea/vomiting.

It is well appreciated that a number of things (e.g., various insults, chemotherapeutic agents, radiation) may lead to the release of serotonin from the enterochromaffin of the gastrointestinal tract. Released serotonin may then bind to certain 5-HT3 receptors and promote nausea/vomiting. 5-HT3 receptor antagonists may ameliorate nausea/vomiting in a number of circumstances and have been utiliz...