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Erschienen in: European Journal of Nutrition 1/2014

01.02.2014 | Original Contribution

The flavonoid luteolin induces nitric oxide production and arterial relaxation

verfasst von: Hongwei Si, Richard P. Wyeth, Dongmin Liu

Erschienen in: European Journal of Nutrition | Ausgabe 1/2014

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Abstract

Purpose

Luteolin, a flavone present in many foods and medicinal plants, may have beneficial effects on various human chronic diseases. In the present study, we investigated the hypothesis that luteolin can directly act on vascular endothelial cells (ECs), leading to nitric oxide (NO) production and subsequent vascular relaxation.

Methods

Rat aortic rings were mounted in organ bath. Luteolin was added cumulatively, and vessel relaxation of rat aortic rings precontracted with phenylephrine (PE) or potassium was recorded. Endothelial nitric oxide synthase (eNOS) phosphorylation at Ser1177 and NO production from aortic rings and primary human aortic endothelial cells (HAECs) exposed to luteolin were measured by using Western blot and fluorometric assay, respectively.

Results

Luteolin dose-dependently (10–100 μmol/L) elicited relaxation of PE- or potassium-contracted aortic rings. The vasorelaxation effect of luteolin was attenuated by the eNOS inhibitor, N-nitro-l-arginine methyl ester, suggesting that this luteolin action is at least partially mediated by activating eNOS activity. We further found that luteolin dose-dependently (10–100 μmol/L) increased eNOS phosphorylation at Ser1177 (up to 1.9-fold) in isolated rat rings. Consistently, exposure of HAECs to luteolin also increased eNOS phosphorylation and NO production.

Conclusions

Luteolin may be a vascular protective agent by directly acting on vascular ECs to stimulate NO-dependent vascular dilatation.
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Metadaten
Titel
The flavonoid luteolin induces nitric oxide production and arterial relaxation
verfasst von
Hongwei Si
Richard P. Wyeth
Dongmin Liu
Publikationsdatum
01.02.2014
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Nutrition / Ausgabe 1/2014
Print ISSN: 1436-6207
Elektronische ISSN: 1436-6215
DOI
https://doi.org/10.1007/s00394-013-0525-7

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