title: Ketanserin blocks alpha 1-adrenoceptors of porcine vascular smooth muscle cells.
abstract: The effect of ketanserin on alpha-adrenoceptors was studied in membrane preparations of the porcine aorta using [3H]prazosin and [3H]yohimbine binding assays to identify alpha 1- and alpha 2-adrenoceptors. Ketanserin bound to alpha-adrenoceptors and the Ki value of ketanserin for alpha 1-adrenoceptors was 8.3 nM, a value practically equal to that of phentolamine (Ki = 7.2 nM). The Ki value of ketanserin for alpha 2-adrenoceptors was 3.3 microM. Thus, at the doses prescribed clinically, ketanserin blocks alpha 1- but not alpha 2-adrenoceptors of porcine vascular smooth muscle.
mesh_terms: D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology; D000818:Animals; D001667:Binding, Competitive; D066298:In Vitro Techniques; D007650:Ketanserin / Q000494:pharmacology*; D009131:Muscle, Smooth, Vascular / Q000187:drug effects* / Q000378:metabolism; D011869:Radioligand Assay; D013552:Swine
chemical_list: D000317:Adrenergic alpha-Antagonists; D007650:Ketanserin