title: Relaxation of human coronary artery and arteria mammaria by K(+)-channel openers.
abstract: Three agents with K(+)-channel-opening activity--nicorandil, bimakalim (EMD 52692), and EMD 56431--were tested for vasorelaxation abilities in human coronary artery and human arteria mammaria. The potency orders were bimakalim = EMD 56431 >> nicorandil for relaxation in human coronary artery and bimakalim = EMD 56431 >> nicorandil in human arteria mammaria. These data demonstrate that K(+)-channel openers are effective vasorelaxant agents in human coronary artery and human arteria mammaria. Bimakalim and EMD 56431 were more potent than nicorandil, a drug that also activates guanylate cyclase.
mesh_terms: D001578:Benzopyrans / Q000494:pharmacology*; D003331:Coronary Vessels / Q000187:drug effects*; D004095:Dihydropyridines / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D008323:Mammary Arteries / Q000187:drug effects*; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000494:pharmacology; D020108:Nicorandil; D015221:Potassium Channels / Q000187:drug effects*; D014664:Vasodilation / Q000187:drug effects; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D001578:Benzopyrans; D004095:Dihydropyridines; D015221:Potassium Channels; D014665:Vasodilator Agents; D009536:Niacinamide; D020108:Nicorandil; C061050:bimakalim