Improvement of endothelial function by Gunnera tinctoria extract with antioxidant properties: Mejoramiento de la función endotelial mediante un extracto de Gunnera tinctoria con actividad antioxidante

Constanza Sabando, Maité Rodríguez-Díaz, Walther Ide, Edgar Pastene, Marcia Avello, Mario Simirgiotis, Susana Rojas, Enrique Villarroel, Tiare Silva-Grecchi, Cristian Gutiérrez, Rebeca Bouza, Bárbara Cicchelli, Marcelo González, Saddys Rodríguez-Llamazares

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

2 Citas (Scopus)

Resumen

Background: Gunnera tinctoria has been collected by Mapuche-Pewenche people for food and medicinal purposes. The high polyphenol content of methanolic extract from G. tinctoria leaves with chemical constituents such as ellagic acid and quercetin derivatives suggests its application to prevent endothelial dysfunction and oxidative stress. The aim of this study was to provide evidence of the protective effect of this extract on endothelial function by reducing oxidative stress induced by high d-glucose and H2O2, as well as by stimulating nitric oxide (NO) levels in human umbilical vein endothelial cells (HUVECs). Results: A methanolic extract with a high content of polyphenols (520 ± 30 mg gallic acid equivalents/g dry extract) was obtained from G. tinctoria leaves. Its main constituent was ellagic acid. The results of Ferric reducing antioxidant power and 2,2-diphenyl-1-picrylhydrazyl radical scavenging assays of the extract confirmed its antioxidant activity by inhibition pathway of radical species. The incubation of HUVECs with the extract decreased the apoptosis and reactive oxygen species (ROS) synthesis induced by high extracellular concentration of d-glucose or hydrogen peroxide. The extract increased endothelial NO levels and reduced vasoconstriction in human placental vessels. Conclusions: This study provides evidence about the antioxidant and endothelial protective properties of methanolic G. tinctoria leaf extract. The extract improves the availability of NO in HUVECs, inhibiting the production of ROS and vasoconstriction.

Idioma originalInglés
Número de artículo55
Páginas (desde-hasta)1-14
Número de páginas14
PublicaciónBiological Research
Volumen53
N.º1
DOI
EstadoPublicada - dic 2020

Áreas temáticas de ASJC Scopus

  • Bioquímica, genética y biología molecular (todo)
  • Agricultura y biología (todo)

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