title: Viscum album aqueous extract induces NOS-2 and NOS-3 overexpression in Guinea pig hearts.
abstract: Viscum album L. aqueous extract, on the Langendorff isolated and perfused heart model, decreases coronary vascular resistance, when compared to control group (36.00 +/- 2.00 vs. 15.80 +/- 1.96 dyn s cm-5). Our data support the fact that this mechanism involves NOS-2 and NOS-3 overexpression (4.65 and 7.89 times over control, respectively), which is correlated with increases in NO (6.24 +/- 2.49 vs. 147.95 +/- 2.79 pmol) and cGMP production (43.94 +/- 2.00 vs. 74.81 +/- 1.96 pmol mg-1 of tissue), compared to control values. Such an effect is antagonized by gadolinium(III) chloride, L-NAME and ODQ. Therefore, coronary vasodilator effect elicited by V. album L. aqueous extract is mediated by the NO/sGC pathway.
authors.affiliation: Departamento de Farmacología, Instituto Nacional de Cardiología Ignacio Chávez, Juan Badiano No. 1, Sección XVI, 14080 México D.F., México. fatl@att.net.mx
authors.forename: Fermin Alejandro
authors.initials: FA
authors.lastname: Tenorio-Lopez
authors.forename: Leonardo Del
authors.initials: LD
authors.lastname: Valle Mondragon
authors.forename: Gabriela Zarco
authors.initials: GZ
authors.lastname: Olvera
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Torres Narvaez
authors.forename: Gustavo
authors.initials: G
authors.lastname: Pastelin
mesh_terms: D000818:Animals; D003331:Coronary Vessels / Q000187:drug effects; D004790:Enzyme Induction / Q000187:drug effects; D004791:Enzyme Inhibitors / Q000494:pharmacology; D006162:Guanylate Cyclase / Q000378:metabolism; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D009206:Myocardium / Q000201:enzymology* / Q000378:metabolism; D009569:Nitric Oxide / Q000096:biosynthesis; D052248:Nitric Oxide Synthase Type I / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D052250:Nitric Oxide Synthase Type III / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D010936:Plant Extracts / Q000494:pharmacology*; D018515:Plant Leaves / Q000378:metabolism; D014655:Vascular Resistance / Q000187:drug effects; D028182:Viscum album / Q000737:chemistry*
chemical_list: D004791:Enzyme Inhibitors; D010936:Plant Extracts; D009569:Nitric Oxide; D052248:Nitric Oxide Synthase Type I; D052250:Nitric Oxide Synthase Type III; D006162:Guanylate Cyclase