Abstract
The vascular effects of 2-methyl-3-propynylquinazolin-4-(3H)-one (QUIN) have been studied on isolated porcine tail arteries. QUlN had no effect on resting tension but relaxed, dose-dependently, arteries precontracted with noradrenaline or high-K+ in the order: NA > high-K+. Also, QUlN inhibited both intracellular (ICD) and extracellular (ECD) Ca2+-dependent contractions in the order: ICD > ECD The results suggest that QUlN interferes with vascular Ca2+ mobilization.