Enhanced activation of NAD(P)H: Quinone oxidoreductase 1 attenuates spontaneous hypertension by improvement of endothelial nitric oxide synthase coupling via tumor suppressor kinase liver kinase B1/adenosine 5′-monophosphate-activated protein kinase-medi

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Title
Enhanced activation of NAD(P)H: Quinone oxidoreductase 1 attenuates spontaneous hypertension by improvement of endothelial nitric oxide synthase coupling via tumor suppressor kinase liver kinase B1/adenosine 5′-monophosphate-activated protein kinase-medi
Author(s)
Yong-Hoon KimJung Hwan HwangKyoung Shim KimJung Ran Noh; Gil Tae Gang; W K Oh; K H Jeong; T H Kwak; H S Choi; I K Lee; Chul Ho Lee
Bibliographic Citation
Journal of Hypertension, vol. 32, no. 2, pp. 306-317
Publication Year
2014
Abstract
Aims: Guanosine 5′-triphosphate cyclohydrolase-1 (GTPCH-1) is a rate-limiting enzyme in de-novo synthesis of tetrahydrobiopterin (BH 4), an essential cofactor for endothelial nitric oxide synthase (eNOS) coupling. Adenosine 5′-monophosphate-activated protein kinase (AMPK) is crucial for GTPCH-1 preservation, and tumor suppressor kinase liver kinase B1 (LKB1), an upstream kinase of AMPK, is activated by NAD +-dependent class III histone deacetylase sirtuin 1 (SIRT1)-mediated deacetylation. β-Lapachone has been shown to increase cellular NAD +/NADH ratio via NAD(P)H:quinone oxidoreductase 1 (NQO1) activation. In this study, we have evaluated whether β-lapachone-induced NQO1 activation modulates blood pressure (BP) through preservation of GTPCH-1 in a hypertensive animal model. Methods and results: Spontaneously hypertensive rats (SHRs), primary aortic endothelial cells, and endothelial cell line were used to investigate the hypotensive effect of β-lapachone and its action mechanism. β-Lapachone treatment dramatically lowered BP and vascular tension in SHRs and induced eNOS activation in endothelial cells. Consistent with these effects, β-lapachone treatment also elevated levels of both aortic cGMP and plasma nitric oxide in SHRs. Meanwhile, β-lapachone-treated SHRs showed significantly increased levels of aortic NAD+, LKB1 deacetylation, and AMPK Thr172 phosphorylation followed by increased GTPCH-1 and tetrahydrobiopterin/dihydrobiopterin ratio. In-vitro study revealed that AMPK inhibition by overexpression of dominant-negative AMPK nearly abolished GTPCH-1 protein conservation. Enhanced LKB1 deacetylation and AMPK activation were also elicited by β-lapachone in endothelial cells. However, inhibition of LKB1 deacetylation by blocking of NQO1 or SIRT1 blunted AMPK activation by β-lapachone. Conclusion: This is the first study demonstrating that eNOS coupling can be regulated by NQO1 activation via LKB1/AMPK/GTPCH-1 modulation, which is possibly correlated with relieving hypertension. These findings provide strong evidence to suggest that NQO1 might be a new therapeutic target for hypertension.
Keyword
endothelial nitric oxide synthaseguanosine 5′-triphosphate cyclohydrolase-1hypertensionNAD(P)H:quinone oxidoreductase 1tumor suppressor kinase liver kinase B1/adenosine 5′-monophosphateactivated protein kinase
ISSN
0263-6352
Publisher
Kluwer
DOI
http://dx.doi.org/10.1097/HJH.0000000000000018
Type
Article
Appears in Collections:
Ochang Branch Institute > Division of National Bio-Infrastructure > Laboratory Animal Resource & Research Center > 1. Journal Articles
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