The Mechanisms Behind the Biological Activity of Flavonoids

Author(s): Ana María González-Paramás, Begoña Ayuda-Durán, Sofía Martínez, Susana González-Manzano, Celestino Santos-Buelga*

Journal Name: Current Medicinal Chemistry

Volume 26 , Issue 39 , 2019

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Abstract:

Flavonoids are phenolic compounds widely distributed in the human diet. Their intake has been associated with a decreased risk of different diseases such as cancer, immune dysfunction or coronary heart disease. However, the knowledge about the mechanisms behind their in vivo activity is limited and still under discussion. For years, their bioactivity was associated with the direct antioxidant and radical scavenging properties of phenolic compounds, but nowadays this assumption is unlikely to explain their putative health effects, or at least to be the only explanation for them. New hypotheses about possible mechanisms have been postulated, including the influence of the interaction of polyphenols and gut microbiota and also the possibility that flavonoids or their metabolites could modify gene expression or act as potential modulators of intracellular signaling cascades. This paper reviews all these topics, from the classical view as antioxidants in the context of the Oxidative Stress theory to the most recent tendencies related with the modulation of redox signaling pathways, modification of gene expression or interactions with the intestinal microbiota. The use of C. elegans as a model organism for the study of the molecular mechanisms involved in biological activity of flavonoids is also discussed.

Keywords: Flavonoids, health implications, bioavailability, metabolites, gut microbiota, antioxidant, gene expression, C. elegans.

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VOLUME: 26
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