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Nicotine-induced hypothermia through an indirect dopaminergic mechanismDepartment of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
The effect of nicotine on core body temperature was studied in mice. Intraperitoneal (i.p.) injection of nicotine (0.5, 1 and 2 mg/kg) induced a dose-dependent hypothermia. The response was inhibited by reserpine (5 mg/kg), the centrally active nicotinic receptor antagonist mecamylamine (0.1-1 mg/kg) and the D-2 dopamine receptor antagonist sulpiride (25-100 mg/kg). The ß-adrenoceptor antagonist propranolol (5 and 10 mg/kg) and the serotonergic blocker methysergide (5 and 10 mg/kg) did not inhibit but increased the nicotine response. The
Key Words: nicotine • dopamine antagonists • nicotinic receptor antagonists • hypothermia • mice
Journal of Psychopharmacology, Vol. 9, No. 1,
20-24 (1995) |
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-adrenoceptor antagonist phenoxybenzamine, the antimuscarinic agent atropine, the D-1 dopamine receptor antagonist SCH 23390, the peripheral dopamine antagonist domperidone and the peripheral nicotinic antagonist hexamethonium did not alter the nicotine-induced hypothermia. It is concluded that nicotine may cause a fall in core body temperature through a central dopaminergic mechanism.