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Effects of dopamine receptor antagonists on gastrin and vomiting responses to apomorphine
Authors:Michel Goiny  Kerstin Uvnäs-Moberg
Affiliation:(1) Department of Pharmacology, Karolinska Institutet, S-10401, Box 60400, Stockholm, Sweden
Abstract:Summary Apomorphine (0.05 mg/kg intravenously) was given to conscious dogs, and gastrin levels were measured in peripheral venous blood with a radioimmunoassay. Apomorphine induced an increase of gastrin levels which peaked at 5 min. The peripheral dopamine D-2/DA2 receptor antagonist domperidone (0.2 mg/kg), but not halopemide (0.1–1 mg/kg) nor the D-1 /DA1 receptor antagonist SCH 23390 (0.1 mg/kg), blocked the gastrin response to apomorphine. Both domperidone and halopemide, but not SCH 23 390, blocked the Apomorphine-induced vomiting. These results suggest that apomorphine increases gastrin levels by an action at D-2/DA2 receptors, which are situated outside the blood brain barrier and differ from the receptor inducing the vomiting.Send offprint requests to M. Goiny at the above address
Keywords:Domperidone  Halopemide  Apomorphine  SCH 23 390  Gastrin
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