Abstract:
OBJECTIVE:We have previously reported that hearts from N-[omega]-nitro-L-arginine methyl ester (L-NAME)-induced hypertensive rats exhibited an enhanced expression of Gi proteins. Since, losartan, an AT1 receptor antagonist, has been shown to attenuate the L-NAME-induced increase in blood pressure, we undertook the present studies to evaluate whether losartan-induced decreased blood pressure in this model of hypertension is associated with attenuation of enhanced expression of Gi proteins and adenylyl cyclase signalling. METHODS:L-NAME (70 mg/kg body weight) and losartan (10 mg/kg body weight), alone or in combination, were given orally to Sprague-Dawley rats for 4 weeks. The control rats received only plain tap water. The levels of inhibitory guanine nucleotide regulatory proteins (Gi alpha-2 and Gi alpha-3) and stimulatory (Gs alpha) proteins and Gi alpha mRNA in hearts were determined by immunoblotting and Northern blotting, respectively. Adenylyl cyclase activity was determined by measuring [32P]cAMP formation from [32P]ATP. RESULTS:Systolic blood pressure was enhanced in L-NAME-treated rats compared to control rats (164 +/- 5.2 versus 105 +/- 2 mmHg; n = 30), and was significantly attenuated by losartan treatment (164 +/- 5.2 mmHg versus 120 +/- 2.5 mmHg; n = 30). The expression of Gi alpha-2 and Gi alpha-3 proteins and their mRNA, which was enhanced in L-NAME-treated rats, was reversed by losartan treatment. However, losartan alone did not alter the levels of Gs alpha or Gi alpha proteins. In addition, the stimulatory effects of guanosine 5'-gamma-thiotriphosphate (GTPgammaS), isoproterenol, 5'-N-ethylcarboxamideadenosine (NECA), glucagon, forskolin (FSK) and sodium fluoride (NaF) on adenylyl cyclase, which were diminished in L-NAME-treated rats, were reversed by losartan treatment. Furthermore, the inhibition of forskolin-stimulated enzyme activity by low concentrations of GTPgammaS (receptor-independent Gi functions), which was significantly enhanced in L-NAME-treated rats, was attenuated by losartan treatment. In addition, losartan was able to reverse the attenuated receptor-mediated inhibitions of adenylyl cyclase by oxotremorine and angiotensin II towards control. CONCLUSIONS:These results suggest the implication of AT1 receptors in enhanced expression of Gi alpha proteins and increased blood pressure in L-NAME-induced hypertension.
journal_name
J Hypertensjournal_title
Journal of hypertensionauthors
Hashim S,Anand-Srivastava MBdoi
10.1097/00004872-200401000-00028subject
Has Abstractpub_date
2004-01-01 00:00:00pages
181-90issue
1eissn
0263-6352issn
1473-5598journal_volume
22pub_type
杂志文章abstract:OBJECTIVE:To examine the changes in plasma brain natriuretic peptide (BNP), atrial natriuretic peptide (ANP) and blood pressure in patients with essential hypertension on a low, normal and high sodium intake. DESIGN AND METHODS:Twelve patients with mild-to-moderate essential hypertension were studied. Plasma, urinary ...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:
更新日期:1994-07-01 00:00:00
abstract:OBJECTIVE:To test the hypothesis that in the stroke-prone spontaneously hypertensive rat (SHRSP), the pressor effect of selective dietary chloride loading depends on a positive external sodium balance. METHODS:In 43 male SHRSP fed a Japanese style diet containing a low normal amount of NaCl (0.4%), we compared the eff...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e3283316cfc
更新日期:2010-01-01 00:00:00
abstract:BACKGROUND:Blood pressure management is a key issue among patients with coronary heart disease (CHD). The present study aimed to identify particular patient groups that may need to be specifically targeted in secondary prevention of CHD. METHODS:EUROASPIRE III is a cross-sectional study conducted in 2006-2007 among pa...
journal_title:Journal of hypertension
pub_type: 杂志文章,多中心研究
doi:10.1097/HJH.0b013e328348efa7
更新日期:2011-08-01 00:00:00
abstract::: Phaeochromocytoma and paraganglioma (PPGL) are chromaffin cell tumours that require timely diagnosis because of their potentially serious cardiovascular and sometimes life- threatening sequelae. Tremendous progress in biochemical testing, imaging, genetics and pathophysiological understanding of the tumours has far-...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000002438
更新日期:2020-08-01 00:00:00
abstract:OBJECTIVE:During the Candesartan Antihypertensive Survival Evaluation in Japan (CASE-J) trial, patients with hypertension who received amlodipine had similar cardiovascular risks as those who received candesartan. We conducted a post-trial study, the Candesartan Antihypertensive Survival Evaluation in Japan 10-year fol...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001780
更新日期:2018-09-01 00:00:00
abstract:OBJECTIVES:To investigate whether glucose or insulin is the cause of increases in oxidative stress and blood pressure in insulin-resistant animals, and to evaluate the effects of alpha-lipoic acid (LA) on the production of the superoxide anion (O2-) in the aorta and blood pressure elevations in various models of diabet...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/01.hjh.0000160215.78973.ba
更新日期:2005-03-01 00:00:00
abstract:OBJECTIVES:To determine whether vigorous exercise and alcohol restriction have additive and independent effects in reducing blood pressure in sedentary male alcohol drinkers. Also to assess whether 4 weeks of vigorous exercise could offset the fall in high-density lipoprotein cholesterol (HDL-cholesterol) usually obser...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-199302000-00012
更新日期:1993-02-01 00:00:00
abstract:OBJECTIVE:To determine whether obese hypertensive patients manifest a diminished regional vasodilator response to an oral glucose challenge. METHODS:Nineteen obese hypertensives (body mass index 34.1 +/- 1.3 kg/m2, blood pressure 144 +/- 3/96 +/- 2 mmHg) and 13 lean controls (23.6 +/- 0.3 kg/m2, 127 +/- 4/83 +/- 3 mmH...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1994-09-01 00:00:00
abstract:OBJECTIVE:To determine whether the decision to treat uncomplicated mild hypertension with drugs, in accordance with the World Health Organization - International Society of Hypertension (WHO/ISH) guidelines based on a series of blood pressure (BP) measurements over 6 months, resulted in the treatment of patients at hig...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199917060-00014
更新日期:1999-06-01 00:00:00
abstract:BACKGROUND:Constitutional hypotension (CHT) is defined as a SBP below 105 mmHg. As autonomic-related symptoms are frequently reported in CHT, these symptoms suggest that the cardiovascular autonomic control is perturbed in individuals with CHT. METHODS:We investigated the autonomic cardiovascular control of 15 women w...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001790
更新日期:2018-10-01 00:00:00
abstract::The effects of i.v. injection of intact digoxin antibody (0.3 mg/rat) and of its Fab fragment (40 mg/rat) on blood pressure, cardiac output and total peripheral resistance were measured in conscious spontaneously hypertensive and deoxycorticosterone hypertensive rats. In vitro findings showed that Fab fragment bound r...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-198710000-00006
更新日期:1987-10-01 00:00:00
abstract:DESIGN:Because of uncertainties regarding the complete antihypertensive mechanism of action of beta-adrenoceptor antagonists, the present study determined whether vagal afferent neurons of humans and rats possess beta-adrenoceptors. Such a location would provide an appropriate target for beta-blockers to modulate neuro...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199506000-00009
更新日期:1995-06-01 00:00:00
abstract:OBJECTIVE:To study the association between polymorphisms in the angiotensin converting enzyme (ACE) gene and angiotensinogen (AGT) gene and hypertension and/or type 2 diabetes in a community population. PATIENTS AND METHODS:The insertion (I)/deletion (D) polymorphism of the ACE gene and the M235T polymorphism of the A...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199917110-00010
更新日期:1999-11-01 00:00:00
abstract:CLINICAL STUDIES:In clinical renal transplantation studies, recipients of a renal graft from a donor with a genetic predisposition to hypertension had higher blood pressures and required more antihypertensive treatment than recipients of a renal graft from a normotensive donor. In addition, blood pressure normalization...
journal_title:Journal of hypertension
pub_type: 社论
doi:10.1097/00004872-199309000-00001
更新日期:1993-09-01 00:00:00
abstract:OBJECTIVE:To determine if the contribution of the sympathetic nervous system to blood pressure could be evidenced by low-frequency oscillations of systolic blood pressure (LF(SBP)), reflecting vascular sympathetic modulation, or by the decrease in blood pressure after autonomic blockade. DESIGN:We studied multiple sys...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章
doi:10.1097/00004872-200309000-00017
更新日期:2003-09-01 00:00:00
abstract::This study focuses on the relationship between some aspects of intra-erythrocytic sodium metabolism (intra-erythrocytic Na content, Na,Li-countertransport), blood pressure, and family history of hypertension, in a group of 84 randomly selected school children (45 males, 39 females). Na,Li-countertransport was signific...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-198803000-00007
更新日期:1988-03-01 00:00:00
abstract:OBJECTIVE:Studies directly comparing the associations of intima-media thickness with blood pressure (BP) on manual sphygmomanometric blood pressure measurement (SBPM) and 24-h ambulatory blood pressure measurement (ABPM) are scarce and have a cross-sectional design. METHODS:At baseline, we measured systolic and diasto...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e328324ed6c
更新日期:2009-04-01 00:00:00
abstract:OBJECTIVE:To verify the benefit of renin-angiotensin system blockade in hypertension, the effects of 24 weeks' losartan and ramipril treatment, both alone and in combination, on urinary albumin excretion (UAE) and circulating transforming growth factor beta1 (TGF beta1) have been evaluated in hypertensive subjects with...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/01.hjh.0000160225.01845.26
更新日期:2005-03-01 00:00:00
abstract:OBJECTIVE:In short-term feeding trials, replacement of other macronutrients with monounsaturated fatty acid reduces blood pressure. However, observational studies have not clearly demonstrated a relationship between monounsaturated fatty acid intake and blood pressure. We report associations of monounsaturated fatty ac...
journal_title:Journal of hypertension
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/HJH.0b013e3283604016
更新日期:2013-06-01 00:00:00
abstract:OBJECTIVE:We investigated the responses of mean arterial pressure and renal blood flow to intravenous and intrarenal angiotensin II, plasma and kidney angiotensin II concentrations and renal angiotensin receptor subtype 1 protein expression, and renal functional responses to intravenous and intrarenal angiotensin recep...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/01.hjh.0000174972.46663.5e
更新日期:2005-08-01 00:00:00
abstract:OBJECTIVE:To investigate methods to diagnose renal artery stenosis (RAS) among the general hypertensive population. METHODS:We studied the value of clinical and biochemical characteristics at the outpatient clinic to identify subjects with a renal artery narrowing of more than 50% of the luminal surface among 1047 hyp...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1996-08-01 00:00:00
abstract::Vascular Na-K pump activity (ouabain-sensitive 86Rb uptake) and cardiac Na,K-ATPase activity are decreased in rats with one-kidney, one clip and reduced renal mass-saline hypertension. In the present study we measured left ventricular, microsomal Na,K-ATPase activity in rats with two steroid forms of hypertension; one...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-198404000-00004
更新日期:1984-04-01 00:00:00
abstract:BACKGROUND:Cross-sectional evidence indicates that eating frequency correlates with blood pressure, hypertension, and related target organ damage. The aim of the present study was to prospectively assess eating frequency as a predictor of arteriosclerosis progression and new onset hypertension over a follow-up period o...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000000822
更新日期:2016-03-01 00:00:00
abstract:OBJECTIVES:Activation of the nuclear factor kappa B (NF kappaB) inflammatory pathway by angiotensin II and reactive oxygen species may play an important role in the development of insulin resistance and cardiovascular injury in hypertensive and metabolic diseases. We have shown that in hypertensive Dahl salt-sensitive ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e3283340da8
更新日期:2010-03-01 00:00:00
abstract:OBJECTIVE:To determine whether automated blood pressure measuring devices can measure blood pressure accurately in patients with atrial fibrillation. DESIGN:Comparison of the accuracy of two electronic sphygmomanometers [Takeda UA-751 (Takeda) and Copal UA-251 (Copal)] and two ambulatory blood pressure monitors [Accut...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章
doi:
更新日期:1995-03-01 00:00:00
abstract:OBJECTIVE:Increased wall-to-lumen ratio of small arteries is a predictor of adverse cardiovascular prognosis. We aimed to analyze retinal arteriolar structure in never-treated patients with essential hypertension and to test whether elevated blood pressure is associated with an increased wall-to-lumen ratio of retinal ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e3282ffdc66
更新日期:2008-07-01 00:00:00
abstract:OBJECTIVES:We examined whether the early initiation of sexual activity is associated with hypertension in US adults, and whether the timing of first menstruation is meaningful in regard of this association. We also assessed the effect modification by ethnicity. METHODS:Using data from 2001 to 2016 National Health and ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001821
更新日期:2018-12-01 00:00:00
abstract::Former guidelines on hypertension never made a commitment to the detection of microalbuminuria for screening or follow-up of hypertensive patients. On the other hand, growing evidence support the contributory role of microalbuminuria in the prediction of absolute cardiovascular risk in hypertension and document the po...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/00004872-200307000-00001
更新日期:2003-07-01 00:00:00
abstract:OBJECTIVE:The acute effects of estrogen on hemodynamic responses were studied with emphasis on the sympathoadrenal system and peripheral circulation. DESIGN:Eleven healthy postmenopausal women recruited from the population-based study BEDA were included in this randomized, double-blind, cross-over, placebo-controlled ...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-200302000-00031
更新日期:2003-02-01 00:00:00
abstract:BACKGROUND:The Fas-Fas ligand (FasL) system is involved in apoptosis in many types of cells. Recently, the expression of FasL on endothelial cells was reported. FasL is cleaved by a metalloproteinase and released in serum as soluble FasL (sFasL). Vasoactive substances, including metalloproteinase, are modulated by endo...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200205000-00024
更新日期:2002-05-01 00:00:00