Activation of glutathione peroxidase via Nrf1 mediates genistein's protection against oxidative endothelial cell injury.

Abstract:

:Cellular actions of isoflavones may mediate the beneficial health effects associated with high soy consumption. We have investigated protection by genistein and daidzein against oxidative stress-induced endothelial injury. Genistein but not daidzein protected endothelial cells from damage induced by oxidative stress. This protection was accompanied by decreases in intracellular glutathione levels that could be explained by the generation of glutathionyl conjugates of the oxidised genistein metabolite, 5,7,3',4'-tetrahydroxyisoflavone. Both isoflavones evoked increased protein expression of gamma-glutamylcysteine synthetase-heavy subunit (gamma-GCS-HS) and increased cytosolic accumulation and nuclear translocation of Nrf2. However, only genistein led to increases in the cytosolic accumulation and nuclear translocation of Nrf1 and the increased expression of and activity of glutathione peroxidase. These results suggest that genistein-induced protective effects depend primarily on the activation of glutathione peroxidase mediated by Nrf1 activation, and not on Nrf2 activation or increases in glutathione synthesis.

authors

Hernandez-Montes E,Pollard SE,Vauzour D,Jofre-Montseny L,Rota C,Rimbach G,Weinberg PD,Spencer JP

doi

10.1016/j.bbrc.2006.05.197

subject

Has Abstract

pub_date

2006-08-04 00:00:00

pages

851-9

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(06)01261-7

journal_volume

346

pub_type

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