Abstract:
BACKGROUND:Hypertension is associated with endothelial dysfunction characterized by decreased endothelium-dependent relaxations and increased endothelium-dependent contractions. Angiotensin converting enzyme inhibitors and thromboxane A2 receptor antagonists decreased the endothelium dysfunction in hypertensive animals. OBJECTIVE:To investigate the effects of prolonged treatment with losartan on endothelium-dependent and -independent relaxations and contractions in aortic rings from spontaneously hypertensive rats (SHR). MATERIAL AND METHODS:Male SHR aged 16 weeks were treated for 12 consecutive weeks either with 10 mg/kg losartan per day or with 60 mg/kg captopril per day administered via their drinking water. The systolic blood pressure was evaluated basally and during week 12. At the end of the treatment period, the vascular reactivity in aortic rings was studies. A group of rats treated with captopril was studies as a reference group. RESULTS:Losartan and captopril reduced the blood pressure significantly and comparably. Both drugs enhanced acetylcholine-induced relaxations and reduced the maximal contractile response to acetylcholine in the presence of NG-nitro-L arginine methyl ester (L-NAME). Contractile responses to phenylephrine, endothelin-l and U46619 were not affected by these treatments. Increased relaxing responses to superoxide dismutase were observed only in captopril-treated rats. Losartan reduced the contractile response to angiotensin II. By contrast this contractile response was elevated in rats treated with captopril. CONCLUSIONS:Prolonged antihypertensive treatments with losartan and captopril decreased the endothelial dysfunction in aortic rings from SHR not only by enhancing NO-dependent relaxations but also by reducing the contractions in response to an endothelium-derived contracting factor. The results further confirm that an endothelium-derived contracting factor plays a role in vascular dysfunction in SHR and the relationships between this factor and angiotensin II.
journal_name
J Hypertensjournal_title
Journal of hypertensionauthors
Rodrigo E,Maeso R,Muñoz-García R,Navarro-Cid J,Ruilope LM,Cachofeiro V,Lahera Vdoi
10.1097/00004872-199715060-00007subject
Has Abstractpub_date
1997-06-01 00:00:00pages
613-8issue
6eissn
0263-6352issn
1473-5598journal_volume
15pub_type
杂志文章abstract:BACKGROUND:Epidemiological investigations have demonstrated a close association between heavy alcohol consumption and hypertension. The mechanisms of this association, however, remain elusive. We studied the effects of alcohol withdrawal on blood pressure, hormonal parameters, and circulating markers of endothelial act...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/01.hjh.0000239283.35562.15
更新日期:2006-08-01 00:00:00
abstract:OBJECTIVES:To investigate whether the combination of exercise training with the angiotensin-converting enzyme inhibitor lisinopril will have an additional beneficial effect on left ventricular function in spontaneously hypertensive rats. DESIGN:Twelve-week-old male rats were assigned to treadmill running (Ht-Ex; 20 m/...
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abstract:OBJECTIVE:The aim of this study was to determine whether antioxidant therapy could relieve hypertension and retard the progression of renal damage in advanced-stage hypertensive rats. METHODS:Twenty-four-week-old spontaneously hypertensive stroke-prone rats were treated for 8 weeks with the superoxide dismutase mimeti...
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更新日期:2020-08-01 00:00:00
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journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199107000-00009
更新日期:1991-07-01 00:00:00
abstract:OBJECTIVES:In experimental animal models, exogenous aldosterone excess has been linked to the progression of renal disease. However, the evidence of an increased risk of renal damage in patients affected by primary aldosteronism remains controversial. We aimed at evaluating the association between primary aldosteronism...
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pub_type: 杂志文章,meta分析
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journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199715110-00015
更新日期:1997-11-01 00:00:00
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journal_title:Journal of hypertension
pub_type: 杂志文章
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journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章
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更新日期:2004-10-01 00:00:00
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更新日期:2003-11-01 00:00:00
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更新日期:2005-12-01 00:00:00
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更新日期:2016-08-01 00:00:00
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更新日期:2013-03-01 00:00:00
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更新日期:2009-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:1985-10-01 00:00:00
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更新日期:2012-02-01 00:00:00
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pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1989-04-01 00:00:00
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