期刊
HYPERTENSION
卷 47, 期 1, 页码 81-86出版社
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/01.HYP.0000197182.65554.c7
关键词
endothelium; sodium; hypertension; free radicals; atherosclerosis
资金
- NHLBI NIH HHS [HL28982, HL55425] Funding Source: Medline
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R29HL055425, R01HL055425, P01HL028982] Funding Source: NIH RePORTER
Endothelial dysfunction (ED) complicates hypertension and is a precursor of atherosclerosis. Reduced NO bioactivity, because of increased reduced NAD(P) H oxidase-derived reactive oxygen species (ROS), plays a critical role in ED. gp91(phox), predominantly expressed in the endothelium and adventitia, is a subunit of NAD(P) H oxidase important for its activation in response to angiotensin (Ang) II. Human atherosclerotic plaques are heavy laden with gp91(phox). We have shown that in Dahl salt-sensitive (DS) rats, a paradigm of low renin salt-sensitive (SS) hypertension in humans, Ang II receptor blockade normalizes ROS production and endothelium-dependent relaxation (EDR) without significantly affecting systolic blood pressure (SBP). To additionally elucidate the mechanisms involved in the functional association of Ang II in SS hypertension, we administered a cell-permeable inhibitor of the assembly of p47(phox) with gp91(phox) in NAD(P) H oxidase, gp91ds-tat (10 mg/kg body weight, 3 weeks by minipump), to DS rats fed a 4% salt diet. Control rats received either vehicle or an inactive scramb-tat peptide. Vehicle-treated DS developed hypertension (SBP 168 +/- 5 mm Hg), left ventricular hypertrophy (LVH), proteinuria, impaired EDR, and increased aortic ROS production (superoxide 115% and peroxynitrite 157%) and expression of the proatherogenic molecules LOX-1 (130%) and MCP-1 (166%). gp91ds-tat, but not scramb-tat, normalized ROS and EDR, as well as LOX-1 and MCP-1, despite nonsignificant effects on SBP (159 +/- 5 mm Hg; P>0.05), left ventricular hypertrophy, and proteinuria. Our findings support the notion that in SS hypertension, activation of NAD(P) H oxidase promotes ED and atherogenesis via decreased nitric oxide bioactivity and increased LOX-1 and MCP-1, independent of blood pressure.
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