Format

Send to

Choose Destination
See comment in PubMed Commons below
Arch Biochem Biophys. 2008 Jan 15;469(2):209-19. Epub 2007 Nov 8.

Mono-O-methylated flavanols and other flavonoids as inhibitors of endothelial NADPH oxidase.

Author information

1
Institute for Biochemistry and Molecular Biology I, Heinrich Heine University Duesseldorf, D-4000-Duesseldorf, Germany.

Abstract

The dietary flavan-3-ol (-)-epicatechin improves the bioactivity of nitric oxide in arterial vessels in vivo. Moreover, it effectively protects cultured vascular endothelial cells from signs of oxidative stress and elevates intracellular nitric oxide in vitro. We addressed the effects of (-)-epicatechin, its metabolic conversion products and structurally related compounds on NADPH oxidase activity in intact human umbilical vein endothelial cells (HUVEC) and in cell lysates. (-)-Epicatechin proved to be an O2*(-)-scavenger but did not inhibit NADPH oxidase activity, whereas the converse pattern was observed for the metabolites 3'- and 4'-O-methyl epicatechin. The dimer procyanidin B2 and (-)-epicatechin glucuronide were O2*(-)-scavengers and inhibited NADPH oxidase. Analysis of structure-activity relations with 45 compounds suggests an apocynin-like mode of NADPH oxidase inhibition. Notably, HUVEC converted (-)-epicatechin to NADPH oxidase-inhibitory methyl ethers. These data identify endothelial NADPH oxidase as candidate target of dietary flavonoids and particularly of their metabolites.

PMID:
17996190
DOI:
10.1016/j.abb.2007.10.012
[Indexed for MEDLINE]
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Support Center