title: Vasodilator effects of peptides derived from egg white proteins.
abstract: The aim of this work was to investigate the effect of several peptides, identified before and after simulated gastrointestinal digestion of an egg white hydrolysate, on the vascular function, in rat aorta. The sequences IVF, RADHPFL and YAEERYPIL (0.1 mM) induced vasodilatation in intact aortic rings, with the maximum percentage of dilation corresponding to RADHPFL (40.5+/-7.0%). Two of the end products of the gastrointestinal digestion, RADHP and YPI, also showed vasodilator activity with degrees of relaxation higher than 50%. However, all these peptides failed to induce relaxation in endothelium-denuded aortic rings. The relaxation induced by RADHP was concentration-dependent and it was partially blocked by the nitric oxide synthase inhibitor L-NAME (100 microM) and by the B(1) bradykinin receptor antagonist Des-HOE 140 (30 nM), thus showing that it was mediated by NO production through the activation of B(1) bradykinin receptors. These findings suggest that these peptides could reduce the vascular resistance and could be used as functional food ingredients in the prevention and treatment of hypertension.
authors.affiliation: Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, Spain.
authors.forename: Marta
authors.initials: M
authors.lastname: Miguel
authors.forename: Yolanda
authors.initials: Y
authors.lastname: Alvarez
authors.forename: Rosina
authors.initials: R
authors.lastname: López-Fandiño
authors.forename: María J
authors.initials: MJ
authors.lastname: Alonso
authors.forename: Mercedes
authors.initials: M
authors.lastname: Salaices
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology; D001011:Aorta / Q000187:drug effects* / Q000502:physiology*; D004305:Dose-Response Relationship, Drug; D004527:Egg Proteins / Q000737:chemistry*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D007213:Indomethacin / Q000494:pharmacology; D008297:Male; D008969:Molecular Sequence Data; D019331:NG-Nitroarginine Methyl Ester / Q000494:pharmacology; D009924:Organ Culture Techniques; D010455:Peptides / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D000959:Antihypertensive Agents; D004527:Egg Proteins; D004791:Enzyme Inhibitors; D010455:Peptides; D014665:Vasodilator Agents; D019331:NG-Nitroarginine Methyl Ester; D007213:Indomethacin