Evidence for an interaction between CB1 cannabinoid and oxytocin receptors in food and water intake

Neuropharmacology
A N A VertyP E Mallet

Abstract

Oxytocin and CB(1) cannabinoid receptors independently modulate food intake. Although an interaction between oxytocin and cannabinoid systems has been demonstrated with respect to the cannabinoid withdrawal syndrome, the interaction between these systems in modulating food intake has not yet been examined. The present study had three primary purposes: (1) to determine whether oxytocin and a CB(1) receptor antagonist block food and fluid intake in a supra-additive manner, (2) to determine the relative position of the CB(1) receptors in the chain of control of food intake in relation to the oxytocin system, and (3) to determine whether the increase in fluid intake induced by an oxytocin antagonist is mediated via cannabinoid receptors. Rats were habituated to the test environment and injection procedure, and then received intracerebroventricular (ICV) injections of various combinations of the oxytocin receptor antagonist tocinoic acid, the cannabionid receptor agonist delta(9)-tetrahydrocannabinol (THC), oxytocin, or the cannabinoid receptor antagonist SR 141716. Food and water intake and locomotor activity were then measured for 120 min. When administrated alone, SR 141716 and oxytocin dose-dependently attenuated baseline food i...Continue Reading

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