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Endothelial nitric oxide synthase activation through obacunone-dependent arginase inhibition restored impaired endothelial function in ApoE-null mice.

Authors :
Yoon J
Park M
Lee Jh
Min BS
Ryoo S
Source :
Vascular pharmacology [Vascul Pharmacol] 2014 Mar; Vol. 60 (3), pp. 102-9. Date of Electronic Publication: 2014 Feb 06.
Publication Year :
2014

Abstract

Endothelial arginase constrains the activity of endothelial nitric oxide synthase (eNOS) by substrate depletion and reduces nitric oxide bioavailability. During the screening course of arginase inhibitor, we found obacunone as an arginase inhibitor. We tested the hypothesis that obacunone regulates vascular endothelial NO production. Obacunone incubation inhibited arginase I and II activities in liver and kidney lysates, respectively, in dose-dependent manner. Obacunone reciprocally increased nitrite/nitrate (NOx) production in HUVECs. In isolated aortic rings, obacunone increased intracellular l-arginine concentration and enhanced eNOS coupling, leading to increased NO and decreased superoxide production, with no changes in protein expression. Vasoconstriction response to U46619 was attenuated in obacunone-treated aortic vessels compared to that in untreated vessels. Endothelium-dependent vasorelaxant response to acetylcholine was significantly increased in obacunone-treated vessels and was modulated by the NO-dependent signaling cascade. The dose-dependent vasorelaxant response to Ach was reduced in the aortic vessels of ApoE-/- mice fed a high-cholesterol diet. Obacunone incubation increased vasorelaxation to the level of a WT mouse, although the endothelium-independent response to sodium nitroprusside was identical among the groups. Therefore, obacunone may help treat cardiovascular diseases derived from endothelial dysfunction and may be useful for designing pharmaceutical compounds.<br /> (Copyright © 2014 Elsevier Inc. All rights reserved.)

Details

Language :
English
ISSN :
1879-3649
Volume :
60
Issue :
3
Database :
MEDLINE
Journal :
Vascular pharmacology
Publication Type :
Academic Journal
Accession number :
24509132
Full Text :
https://doi.org/10.1016/j.vph.2014.01.006