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Abstract

The present study was conducted to investigate the effects of nicorandil on arterial blood pressure and vascular contractile responses in the normotensive anesthetized rats and to establish the mechanism of action. Nicorandil (30~300 ${\mu}g/kg$) given into a femoral vein of the normotensive anesthetized rat produced a dose-dependent depressor response. These nicorandil-induced hypotensive responses were not affected by pretreatment with atropine (3.0 mg/kg, i.v.) or propranolol (2.0 mg/kg, i.v.), while markedly inhibited in the presence of chlorisondamine (1.0 mg/kg, i.v.) or phentolamine (2.0 mg/kg, i.v.). Futhermore, after the pretreatment with 4-aminopyridine (1.0 mg/kg/30 min, i.v.) or glibenclamide (50.0 ${\mu}g/kg$/30min) into a femoral vein made a significant reproduction in pressor responses induced by intravenous norepinephrine. In he isolated rat aortic strips, both phenylephrine (10$^{-5}$ M)- and high potassium (5.6 ${\times}\;10^{-2}$ M)-inducedcontractile responses were dose-dependently depressed in the presence of nicorandil (25~100 ${\mu}M$). Collectively, these experimental results demonstrate that intravenous nicorandil causes a dose-dependent depressor action in the anesthetized rat at least partly through the blockade of vascular adrenergic ${\alpha}_1$-receptors, in addition to the well-known mechanism of potassium channel opening-induced vasorelaxation.

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