title: Divergence of ANF analogs in smooth muscle cell cGMP response and aorta vasorelaxation: evidence for receptor subtypes.
abstract: ANF analog potencies in stimulating smooth muscle cell cGMP were compared with the ability to relax histamine-constricted rabbit aorta in vitro. ANF[1-28], [5-28], [5-27] and Lys-11[5-28] elevated cGMP and were potent vasorelaxants. ANF[7-23] and Lys-11[7-23] were potent cGMP stimulators but 1000-fold weaker relaxants. Tyr-8[5-27] did not stimulate cGMP synthesis or antagonize the response of the other peptides, yet was a potent vasorelaxant. Crosslinking with 125I-ANF identified bands at 150 and 65 KD by SDS-PAGE. ANF[1-28], Lys-11[7-23] and Tyr-8[5-27] blocked crosslinking at low concentration despite disparate activities. These data support the existence of ANF receptor subtypes and suggest that cGMP elevation alone is not sufficient to promote atrial peptide-induced vasorelaxation.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects / Q000502:physiology; D009320:Atrial Natriuretic Factor / Q000494:pharmacology*; D002478:Cells, Cultured; D006152:Cyclic GMP / Q000378:metabolism*; D066298:In Vitro Techniques; D009131:Muscle, Smooth, Vascular / Q000187:drug effects* / Q000502:physiology; D011817:Rabbits; D017461:Receptors, Atrial Natriuretic Factor; D011956:Receptors, Cell Surface / Q000187:drug effects / Q000378:metabolism; D013329:Structure-Activity Relationship; D014664:Vasodilation / Q000187:drug effects*
chemical_list: D011956:Receptors, Cell Surface; D009320:Atrial Natriuretic Factor; D017461:Receptors, Atrial Natriuretic Factor; D006152:Cyclic GMP