Vasorelaxant effects in aortic rings of eight diterpenoids isolated from three Venezuelan plants

• Autor(a) principal: Mondolis,Eily
• Data de Publicação: 2013
• Outros Autores: Morán-Pinzón,Juan Antonio, Rojas-Marquéz,Foción Alberto, López-Pérez,José Luis, Abad,Andrés, Amaro-Luis,Juan Manuel, León,Estela Guerrero De
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Revista Brasileira de Farmacognosia (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0102-695X2013000500769
• topic: Diterpenoids; Pinus caribaea; Lourteigia stoechadifolia; Espeletia schultzii; Vasorelaxant activity

Vasorelaxant activity Vasorelaxant effects of eight diterpenoids isolated from three Venezuelan plants [(+)-manool [(+)-labda-8(17),14-dien-13-ol], (+)-manoyl oxide, (+)-2-oxomanoyl oxide, sandaracopimara-8(14), 15-dien-3β, 19-diol, jhanidiol acetate (18-acetoxy-1βhydroxymanoyl oxide), jhanidiol (1β,18-dihydroxymanoyl oxide),ent-kaur-16-en-19ol and grandiflorenic acid (ent-kaur-9(11),16-dien-19-oic acid)] aortic rings were assessed in intact endothelium and endothelium-denuded isolated rat. Thw cumulative addition (10-6 to 10-4 M) of each product were carried out after contraction with phenylephrine (10-6 M). Jhanidiol acetate and ent-kaur-9,16-en-19-oic acid at 10-4 M dose concentration, exhibit the maximal vasorelaxant effect in endothelium-intact rings (51.61 ± 7.62% and 79.27 ± 7.41%, respectively). In endothelium-denuded aortic rings, the maximum vascular response exerted by both compounds was not abolished (64.14 ± 5.64% and 84.84 ± 3.62%, respectively). In denuded aortic rings, the half-maximal inhibitory concentration (IC50) Jhanidiol was obtained by the ethyl less than those obtained in rings endothelium (1.09 × 10-4 vs 7.29 × 10-5 M, respectively), although this difference was not significant. These results suggested that the mechanism behind the vasorelaxant effect of the two diterpene is mediated by endothelium-independent pathways.