title: Effects of antioxidants on endothelial function in human saphenous vein in an ex vivo model.
abstract: This ex vivo study is aimed at determining the beneficial effects of antioxidant agents on human saphenous vein endothelial function. Vein rings harvested during infrainguinal bypass surgery were assessed in an organ bath for endothelium-dependent relaxation, initially without and then with the addition of 10 microM manganese tetrakis benzoic acid porphyrin (MnTBAP), 0.01% N-acetylcysteine (NAC), 0.02% NAC, 10 microM vitamin C, and 100 microM vitamin C. Fifty-five vein rings from 22 patients were analyzed. MnTBAP improved the endothelium-dependent relaxation when compared with control (57.0% vs 37.8%, P < .01). Addition of 0.01% or 0.02% NAC did not improve the endothelium-dependent vasorelaxation (28.2% vs 18.6%, P = ns and 37.8% vs 29.8%, P = ns, respectively). Although 10-microM vitamin C failed to improve endothelial function (50.6% vs 37.2%, P = ns), 100-microM vitamin C significantly enhanced endothelium-dependent relaxation (66.5% vs 38.3%, P < .001). These results suggest that the addition of MnTBAP and high-dose vitamin C can improve the endothelial function of harvested saphenous vein segments in an ex vivo model.
authors.affiliation: Department of Vascular and Endovascular Surgery, Belfast City Hospital, Lisburn Road, Belfast BT9 7AB, Northern Ireland, UK. aneessharif@yahoo.co.uk
authors.forename: Muhammed Anees
authors.initials: MA
authors.lastname: Sharif
authors.forename: Ulvi
authors.initials: U
authors.lastname: Bayraktutan
authors.forename: Nityanand
authors.initials: N
authors.lastname: Arya
authors.forename: Stephen A
authors.initials: SA
authors.lastname: Badger
authors.forename: Mark E
authors.initials: ME
authors.lastname: O'Donnell
authors.forename: Ian S
authors.initials: IS
authors.lastname: Young
authors.forename: Chee V
authors.initials: CV
authors.lastname: Soong
mesh_terms: D000109:Acetylcholine / Q000494:pharmacology; D000111:Acetylcysteine / Q000494:pharmacology*; D000368:Aged; D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008665:Metalloporphyrins / Q000494:pharmacology*; D008875:Middle Aged; D012501:Saphenous Vein / Q000187:drug effects* / Q000601:surgery; D014664:Vasodilation / Q000187:drug effects*; D014665:Vasodilator Agents / Q000494:pharmacology*
chemical_list: D000975:Antioxidants; D008665:Metalloporphyrins; D014665:Vasodilator Agents; C097284:manganese(III)-tetrakis(4-benzoic acid)porphyrin; D000109:Acetylcholine; D001205:Ascorbic Acid; D000111:Acetylcysteine