title: Effects of 2-nicotinamidethyl nitrate (SG-75), a new antianginal drug, on the cyclic AMP phosphodiesterase activity.
abstract: The effect of a potent coronary vasodilator, SG-75, on the purified cyclic AMP phosphodiesterase of the bovine heart was compared with that of papaverine. SG-75 inhibited the phosphodiesterase activity in a competitive manner, the IC50 being 10 mM. SG-75 was approximately 300 times less potent than papaverine in inhibiting the phosphodiesterase activity. Thus, it is unlikely that the phosphodiesterase inhibition by SG-75 is involved in its vasodilator action.
mesh_terms: D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000037:antagonists & inhibitors*; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000494:pharmacology; D020108:Nicorandil; D009566:Nitrates / Q000494:pharmacology*; D010208:Papaverine / Q000494:pharmacology; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D009566:Nitrates; D014665:Vasodilator Agents; D009536:Niacinamide; D020108:Nicorandil; D010208:Papaverine; D015105:3',5'-Cyclic-AMP Phosphodiesterases