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Obtaining from Grape Pomace an Enzymatic Extract with Anti-inflammatory Properties

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Abstract

Grape pomace, a winemaking industry by-product, is a rich source of bioactive dietary compounds. Using proteases we have developed an enzymatic process for obtaining a water-soluble extract (GP-EE) that contains biomolecules such as peptides, carbohydrates, lipids and polyphenols in soluble form. Of especial interest is its high polyphenol content (12 %), of which 77 % are flavonoids and 33 % are phenolic acids. The present study evaluates in vitro the potential anti-inflammatory effect of GP-EE by monitoring the expression of inflammatory molecules on N13 microglia cells stimulated with lipopolysaccharide (LPS). GP-EE decreases the mRNA levels of the inflammatory molecules studied. The molecules under study were as follows: inducible nitric oxide synthase (iNOS), tumor necrosis factor- α (TNF-α), interleukin-1β (IL-1β), the ionized calcium binding adaptor molecule-1(Iba-1) and the Toll like receptor-4 (TLR-4), as well as the iNOS protein level in LPS-stimulated microglia. Our findings suggest that, as a result of its ability to regulate excessive microglial activation, GP-EE possesses anti-inflammatory properties. Therefore, acting as a chemopreventive agent, it may be of therapeutic interest in neurodegenerative diseases involving neuroinflammation. We can, therefore, propose GP-EE as a useful natural extract and one that would be beneficial to apply in the field of functional foods.

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Abbreviations

GP:

Grape pomace

GP-EE:

Grape pomace enzymatic extract

LPS:

Lipopolysaccharide

iNOS:

Inducible nitric oxide synthase

TNF-α:

Tumor necrosis factor- alpha

IL-1β:

Interleukin-1β

TLR-4:

Toll like receptor-4

Iba-1:

Ionized calcium binding adaptor molecule-1

UPLC:

Ultra-high performance liquid chromatography

RT:

Reverse transcription

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Acknowledgments

This research was supported by a grant of the Ministerio de Innovación y Ciencia, Spain (TRACE 2009-0263-01).

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The authors declare no conflicting interests or financial disclosures.

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Correspondence to A. Castaño.

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Rodríguez-Morgado, B., Candiracci, M., Santa-María, C. et al. Obtaining from Grape Pomace an Enzymatic Extract with Anti-inflammatory Properties. Plant Foods Hum Nutr 70, 42–49 (2015). https://doi.org/10.1007/s11130-014-0459-0

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  • DOI: https://doi.org/10.1007/s11130-014-0459-0

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