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Título: | Cocoa flavonoids improve insulin signalling and modulate glucose production via AKT and AMPK in HepG2 cells |
Autor: | Cordero Herrera, Isabel CSIC; Martín, M. Ángeles CSIC ORCID ; Bravo, Laura CSIC ORCID; Goya, Luis CSIC ORCID; Ramos, Sonia CSIC ORCID | Fecha de publicación: | 2013 | Editor: | John Wiley & Sons | Citación: | Molecular Nutrition and Food Research 57(6): 974-985 (2013) | Resumen: | [Scope] Cocoa and (-)-epicatechin (EC), a main cocoa flavanol, have been suggested to exert beneficial effects in diabetes, but the mechanism for their insulin-like effects remains unknown. In this study, the modulation of insulin signalling by EC and a cocoa phenolic extract (CPE) on hepatic HepG2 cells was investigated by analysing key proteins of the insulin pathways, namely insulin receptor, insulin receptor substrate (IRS) 1 and 2, PI3K/AKT and 5′-AMP-activated protein kinase (AMPK), as well as the levels of the glucose transporter GLUT-2 and the hepatic glucose production. [Methods and results] EC and CPE enhanced the tyrosine phosphorylation and total insulin receptor, IRS-1 and IRS-2 levels and activated the PI3K/AKT pathway and AMPK in HepG2 cells. CPE also enhanced the levels of GLUT-2. Interestingly, EC and CPE modulated the expression of phosphoenolpyruvate carboxykinase, a key protein involved in the gluconeogenesis, leading to a diminished glucose production. In addition, EC- and CPE-regulated hepatic gluconeogenesis was prevented by the blockage of AKT and AMPK. [Conclusion] Our data suggest that EC and CPE strengthen the insulin signalling by activating key proteins of that pathway and regulating glucose production through AKT and AMPK modulation in HepG2 cells. | Versión del editor: | https://doi.org/10.1002/mnfr.201200500 | URI: | http://hdl.handle.net/10261/81563 | DOI: | 10.1002/mnfr.201200500 | Identificadores: | doi: 10.1002/mnfr.201200500 issn: 1613-4125 |
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