title: Dietary salt-loading attenuates endothelium-dependent relaxation in response to histamine but not to acetylcholine in rat aortic rings.
abstract: Endothelium-dependent relaxation in response to histamine and ACh has been studied on precontracted aortic rings from control and salt-loaded Sprague-Dawley rats. Both ACh and histamine caused relaxation of the noradrenaline-induced precontraction only in the presence of the endothelium. The relaxation response to ACh in rings from control and salt-loaded rats did not differ significantly whereas histamine-induced relaxation was significantly attenuated in aortae from salt-loaded rats. The results suggest that salt-induced hypertension is associated with impairment of endothelium-dependent relaxation to histamine but not to ACh.
authors.affiliation: Department of Physiology, College of Medicine, University of Lagos, Nigeria.
authors.forename: P C
authors.initials: PC
authors.lastname: Obiefuna
authors.forename: O A
authors.initials: OA
authors.lastname: Sofola
authors.forename: A B
authors.initials: AB
authors.lastname: Ebeigbe
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology*; D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects / Q000502:physiology; D004730:Endothelium, Vascular / Q000187:drug effects / Q000502:physiology; D006632:Histamine / Q000494:pharmacology*; D066298:In Vitro Techniques; D009569:Nitric Oxide / Q000502:physiology; D009638:Norepinephrine / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012965:Sodium Chloride / Q000008:administration & dosage*; D012982:Sodium, Dietary / Q000008:administration & dosage; D014664:Vasodilation / Q000187:drug effects* / Q000502:physiology
chemical_list: D012982:Sodium, Dietary; D009569:Nitric Oxide; D012965:Sodium Chloride; D006632:Histamine; D000109:Acetylcholine; D009638:Norepinephrine