Morphine Induced Changes in Ethanol-and Water-intake Are Attenuated by the 5-HT3/4 Antagonist Tropisetron (ICS 205-930)

Overview

Journal Psychopharmacology (Berl)

Specialty Pharmacology

Date 1995 May 1

PMID 7659766

Citations 5

Authors

C W Hodge

J S Niehus

H H SAMSON

Affiliations

Soon will be listed here.

Abstract

The opiate agonist morphine has been shown to increase ethanol intake and mesolimbic dopamine (DA) levels. Conversely, the 5-HT3/4 antagonist tropisetron has been shown to decrease ethanol intake and morphine-induced increases in mesolimbic DA levels. This study was designed to test the effects of acutely administered tropisetron on morphine-induced changes in ethanol (6% v/v) and water intake in a two-bottle test procedure. Ten water restricted male rats were injected with combinations of morphine (0.0, 0.56, 1.0, 1.5, 10.0, and 17.0 mg/kg, SC) and tropisetron (0.0, 1.0, 10.0, and 17.0 mg/kg, SC) prior to test sessions. Morphine (1.0 and 1.5 mg/kg) significantly increased absolute (g/kg) and relative ethanol intake (ethanol/total fluid). Tropisetron alone did not affect ethanol or water intake. When tropisetron (10.0 and 17.0 mg/kg) was administered in combination with morphine (1.5 mg/kg), the increase in ethanol intake induced by morphine was attenuated. Tropisetron (1.0 mg/kg) reversed a decrease in ethanol intake induced by morphine (17.0 mg/kg). The two highest doses of tropisetron partially attenuated a significant decrease in water intake produced by morphine (17.0 mg/kg). These data suggest that opiate and 5-HT3 mechanisms could interact in the regulation of ethanol intake. However, the doses of tropisetron tested were high and, therefore, the potential involvement of 5-HT4 receptors or other neurotransmitter systems in regulating ethanol intake is discussed.

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