Inhibition of apomorphine-induced yawning and penile erection by neurotensin

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¹European Institute for Peptide Research, Unité de Neuropsychopharmacologie Expérimentale U.R.A. 1170 du C.N.R.S., Faculté de Médecine et Pharmacie de Rouen, Saint Etienne Du Rouvray, France.

|July 1, 1991

Abstract:

The yawns and penile erection elicited in rats by apomorphine (100 micrograms/kg SC) are dose-dependently suppressed by the enkephalinase-resistant analog of NT, [D-Trp11]NT, intracerebroventricularly (ICV) injected (10-120 ng per rat). This antagonistic effect was shared by NT (0.75-3 micrograms per rat) administered ICV. The yawns induced by pilocarpine (2 mg/kg IP) were similarly antagonized by [D-Trp11]NT (30-120 ng per rat). The enkephalinase inhibitor acetorphan (5 mg/kg IV) reduced in a naloxone (2 mg/kg, SC)-resistant manner the apomorphine-induced penile erection or yawning.

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