Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/16210
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Title

Conjugation of catechins with cysteine generates antioxidant compounds with enhanced neuroprotective activity

AuthorsTorres, Josep Lluís CSIC ORCID; Lozano, Carles; Maher, P.
KeywordsPolyphenols
Cysteine
Antioxidants
Glutamate
Neuroprotection
Issue Date22-Jan-2005
PublisherElsevier
CitationPhytochemistry 66(17): 2032-2037 (2005)
AbstractAntioxidant compounds derived from the conjugation of (−)-epicatechin and (−)-epicatechin 3-O-gallate with cysteine and cysteine derivatives protected HT-22 nerve cells (EC50 between 36 and 65 μM) from death triggered by glutamate while underivatized (−)-epicatechin was almost inactive (EC50 = 610 μM). Differences in free radical scavenging capacity (DPPH assay) could not account for the improvement in neuroprotective activity upon derivatization of (−)-epicatechin with thiols. Moreover, while the gallate-containing compounds are more efficient radical scavengers than their non-galloylated counterparts, they are only equally or less potent as neuroprotective agents. Although all of the conjugates were able to scavenge mitochondrially generated reactive oxygen species (ROS) inside the cells, the majority of their neuroprotective activity appeared to be dependent upon their ability to maintain glutathione levels. These results suggest that a mechanism other than ROS scavenging is involved in the neuroprotective action exerted by the epicatechin conjugates.
Description6 pages, 2 figures, 1 table.-- PMID: 16153406 [PubMed].-- Printed version published Sep 2005.-- Issue title: "Tannins and Related Polyphenols (Part 1)".
Publisher version (URL)http://dx.doi.org/10.1016/j.phytochem.2004.12.003
URIhttp://hdl.handle.net/10261/16210
DOI10.1016/j.phytochem.2004.12.003
ISSN0031-9422
E-ISSN1873-3700
Appears in Collections:(IQAC) Artículos

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