Abstract:
OBJECTIVES:Mechanisms involved in hypertension in homozygous mice for the defective endothelial nitric oxide synthase gene (eNOS-/-) have not been fully elucidated. As NO is a potent vasodilator agent and possibly promotes angiogenesis, we investigated whether vasoconstriction and/or microvascular rarefaction could explain hypertension in these mice. METHODS:Immunohistochemistry with mouse monoclonal smooth muscle alpha-actin antibody was used to detect arterioles, and quantification of arteriolar density was performed in the left ventricle and in the gracilis muscle of 12-week-old male eNOS+/+ and eNOS-/- mice. Haemodynamic parameters - mean arterial pressure (MAP), cardiac index (CI), total peripheral résistance (TPR), myocardial blood flow, muscular blood flow and corresponding resistances - were measured or calculated using the fluorescent microsphere method in basal conditions and after infusion of sodium nitroprusside (SNP) (5 to 150 microg/kg per min) in eNOS-/- mice, compared with eNOS+/+ mice. RESULTS:We evidenced a significant decrease in arteriolar density in the heart (-16%, P < 0.02) and in the gracilis muscle (-22%, P < 0.05) in eNOS-/- mice. In basal conditions, eNOS-/- mice developed significant hypertension (MAP = 127 +/- 14 versus 77 +/- 14 mmHg, P < 0.001) associated with decreased CI (-29%, P < 0.001) and increased TPR (+ 125%, P < 0.001). Coronary and gracilis muscular resistances were increased (by 75 and 89% respectively, P < 0.001) compared with eNOS+/+ mice, whereas myocardial and skeletal muscle tissue blood flows were not affected. After SNP administration (10 microg/kg per min), a dose that did not significantly modify haemodynamic parameters in eNOS+/+ mice, MAP, TPR and regional resistances were normalized in eNOS-/- mice, showing that vasodilation may correct hypertension in eNOS-/- mice. However, under maximal vasodilating conditions, TPR and regional resistances remained significantly higher in eNOS-/- mice than those of eNOS+/+ mice. CONCLUSION:Anatomical and functional results show that both vasoconstriction and arteriolar rarefaction are involved in hypertension of eNOS-/- mice. Indeed, under maximal vasodilation, arterial pressure and TPR remained significantly higher in eNOS-/- mice than in eNOS+/+ mice, evidencing a major role of microvascular rarefaction in this model of hypertension.
journal_name
J Hypertensjournal_title
Journal of hypertensionauthors
Kubis N,Richer C,Domergue V,Giudicelli JF,Lévy BIdoi
10.1097/00004872-200208000-00021subject
Has Abstractpub_date
2002-08-01 00:00:00pages
1581-7issue
8eissn
0263-6352issn
1473-5598journal_volume
20pub_type
杂志文章abstract::Reduced nitric oxide bioavailability contributes to endothelial dysfunction and hypertension. The endothelial isoform of nitric oxide synthase (eNOS) is responsible for the production of nitric oxide within the endothelium. Loss of eNOS cofactor tetrahydrobiopterin to initial increase in oxidative stress leads to unco...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/HJH.0000000000000587
更新日期:2015-06-01 00:00:00
abstract::Angioplasty of renal artery stenosis has been used extensively in the last two decades for treating renovascular hypertension, and, more recently, for preserving the jeopardized renal function. A large body of evidence has accumulated indicating that this approach is by far the most convenient for patients with fibrom...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/00004872-199917120-00001
更新日期:1999-12-01 00:00:00
abstract:OBJECTIVE:Endothelin is thought to be related to cardiovascular disease. The purpose of this study was to determine whether endothelin levels could be reduced by a calcium antagonist and a 'natural factor'. DESIGN:Since calcium ionophores can induce endothelin-1 messenger RNA synthesis in cultured endothelial cells, t...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199309000-00012
更新日期:1993-09-01 00:00:00
abstract::Atrial natriuretic peptide (ANP) plays a pivotal role in modulation of vascular function and it is also involved in the pathophysiology of several cardiovascular diseases. We provide an updated overview of the current appraisal of ANP vascular effects in both animal models and humans. We describe the physiological imp...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/HJH.0b013e32835ed5eb
更新日期:2013-06-01 00:00:00
abstract:OBJECTIVE:This study analyzed regional differences in blood pressure (BP) distribution and management in Germany 2008-2011 in a nationwide study. METHODS:The analyses were based on standardized BP measurements and anatomical therapeutic chemical classification-coded medication from the population-based German Health I...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000000211
更新日期:2014-07-01 00:00:00
abstract:OBJECTIVE:We have previously shown that conduit arteries of normotensive (WKY) and hypertensive (SHR) Japanese rats differ from normotensive (LN) and hypertensive (LH) Lyon rats in terms of lower aortic thickness and higher collagen III content, whereas differences in vasoactive properties are unknown. METHODS:Aortic ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-199917100-00007
更新日期:1999-10-01 00:00:00
abstract:OBJECTIVE:To investigate whether the glycoprotein (gp130)-mediated survival pathway, which protects cardiomyocytes from apoptosis, is depressed in left ventricular hypertrophy hypertensive patients with chronic heart failure. METHODS:Transvenous endomyocardial biopsies were obtained in 52 hypertensive patients with le...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32828626e2
更新日期:2007-10-01 00:00:00
abstract::Measurements of exchangeable sodium, arterial pressure and plasma concentrations of active renin, angiotensin II, aldosterone, sodium and potassium were made in 35 hypertensive patients with renal artery stenosis, 30 having unilateral renal arterial lesions. Plasma urea was below 7 mmol/l in 24 of the patients with un...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-198310000-00015
更新日期:1983-10-01 00:00:00
abstract:OBJECTIVES:Renal denervation (RDN) can reduce sympathetic activity and blood pressure (BP) in patients with hypertension. The effects on resting and ambulatory heart rate (HR), also regulated by the sympathetic nervous system, are not established. METHODS:Herein, we report 12-month outcomes from the Global SYMPLICITY ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001085
更新日期:2016-12-01 00:00:00
abstract:AIMS:Monocyte/macrophages participate in inflammatory responses that may play an important role in mineralocorticoid-induced vascular damage. We hypothesized that monocyte/macrophages modulate aldosterone effects on oxidative stress, endothelial function, and ultimately vascular stiffness. METHODS:Adult heterozygous o...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e328330a963
更新日期:2009-11-01 00:00:00
abstract:OBJECTIVES:To determine the prevalence and treatment status of hypertension in South Africa. DESIGN:National cross-sectional survey. SETTING:13 802 randomly selected South Africans, 15 years and older, were visited in their homes in 1998. METHODS:Trained fieldworkers completed questionnaires on lifestyle and chronic...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200110000-00004
更新日期:2001-10-01 00:00:00
abstract:BACKGROUND:We have previously described anatomical changes in pulmonary blood flow distribution in chronic hypoxic rats, associated with pulmonary arterial hypertension (PAH). METHOD:In this study, we utilized synchrotron radiation microangiography to compare these changes in pulmonary blood flow with a PAH-model indu...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32832af6a1
更新日期:2009-07-01 00:00:00
abstract:OBJECTIVES:High blood pressure is known to be associated with higher cardiovascular risk. The emphasis has shifted over time from diastolic pressure to systolic pressure and variability in blood pressure. This study examined the impact of transient and sustained diastolic hypertension on later mortality. METHODS:In th...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e32835a4dd8
更新日期:2013-01-01 00:00:00
abstract:OBJECTIVES:We hypothesized that the aldosterone: renin ratio (ARR) predicts the antihypertensive response to mineralocorticoid receptor antagonist, spironolactone (SPIRO), when compared with bendroflumethiazide (BFZ). METHODS:We conducted a randomized, crossover, trial on hypertensive patients with either high ARR (HA...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/HJH.0b013e328332b79b
更新日期:2010-01-01 00:00:00
abstract:OBJECTIVE:We studied the vasoconstrictor effects of the thromboxane A2 (TxA2) analogue U46619 in the perfused hind limb of rats under constant flow before and after intravenous injection of irbesartan, an angiotensin II AT1 receptor antagonist, to test whether irbesartan interacts in vivo with the thromboxane A2/prosta...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200103001-00007
更新日期:2001-03-01 00:00:00
abstract:OBJECTIVES:Immigration studies can shed light on hypertension development and reveal high-risk populations. To this end, we investigated the association between age at immigration and hypertension occurrence at adolescence among immigrants to Israel. METHODS:We analyzed cross-sectional data on 2 681 294 adolescents as...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000001957
更新日期:2019-04-01 00:00:00
abstract:BACKGROUND:In the nineteenth century, prior to the introduction of the cuff sphygmomanometer, stiffening of arteries was recognized as an indicator of vascular ageing and cardiovascular risk. Through the twentieth century, views on vascular ageing came to focus on brachial blood pressures and on occlusive atherosclerot...
journal_title:Journal of hypertension
pub_type: 杂志文章,评审
doi:10.1097/HJH.0b013e32835ed5b9
更新日期:2013-05-01 00:00:00
abstract:BACKGROUND:Comprehensive studies have confirmed that particulate matter air pollution could trigger myocardial infarction, heart failure and reduce heart rate variability; however, its effect on blood pressure (BP) remains controversial. Therefore, we did a systematic review and meta-analysis to investigate the associa...
journal_title:Journal of hypertension
pub_type: 杂志文章,meta分析,评审
doi:10.1097/HJH.0000000000000342
更新日期:2014-11-01 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:To assess the prevalence and risk markers of arterial hypertension in the context of a rapidly growing urbanization in Africa. DESIGN:A cross-sectional study was performed on a representative sample of inhabitants of Pikine, an urban suburb of Dakar, Senegal. METHODS:Blood pressure was measured by properly ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:
更新日期:1992-09-01 00:00:00
abstract:OBJECTIVE:To investigate the effect of cyclosporine A (CsA; Sandimmun Neoral) on systemic and renal hemodynamics, tubular function, and sodium excretion in healthy volunteers. Furthermore, we studied whether CsA enhances the systemic and renal hemodynamic sensitivity to norepinephrine. METHODS:Eighteen healthy volunte...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-199715030-00014
更新日期:1997-03-01 00:00:00
abstract:BACKGROUND:Cross-sectional studies of the association between hypertension (HTN) and brain atrophy have shown reductions in prefrontal, temporal, and hippocampal volumes, and have identified thinner cortices across the cortical mantle. METHOD:In the current study, we followed 96 participants enrolled in the Baltimore ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000000531
更新日期:2015-06-01 00:00:00
abstract:OBJECTIVE:Nephrin, a cytoskeletal protein which localizes to the slit pore of podocytes, may play a role in proteinuria. This study examines the possible relationship between nephrin expression and albuminuria in normotensive and hypertensive diabetic rats. METHODS:Streptozotocin diabetes was induced in both Wistar-Ky...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/00004872-200205000-00034
更新日期:2002-05-01 00:00:00
abstract::Fish and fish oils have been reported to reduce blood pressure in normotensives and untreated hypertensives. The present study examined the effect of dietary supplementation with fish oil on blood pressure in 20 treated hypertensives with controlled blood pressures who continued their usual antihypertensive drug treat...
journal_title:Journal of hypertension
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00004872-199004000-00007
更新日期:1990-04-01 00:00:00
abstract:OBJECTIVES:Local atrial tissue angiotensin II (AngII) level is elevated in atrial fibrillation (AF), but the mechanism is unknown. We hypothesized that atrial myocytes express all components of the renin-angiotensin system (RAS) and investigated whether rapid depolarization alone is sufficient to increase paracrine Ang...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e3282f34a4a
更新日期:2008-03-01 00:00:00
abstract:OBJECTIVES:Strong evidence has secured aging as a powerful predictor of both cardiovascular risk and endothelial dysfunction, yet specific treatment is not available. We tested the hypothesis that vascular responsiveness to flavanol-rich cocoa increases with advancing age. We have previously shown that flavanol-rich co...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/01.hjh.0000239293.40507.2a
更新日期:2006-08-01 00:00:00
abstract:BACKGROUND:Activated coagulation Factor XII (FXIIa) infusion increases peripheral resistance (TPR) and mean arterial pressure (MAP) of Brown Norway but not plasma kininogen deficient Brown Norway Katholiek (BNK) rats. FXIIa concentrations are elevated in hypertensive end-stage renal disease patients receiving conventio...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000000192
更新日期:2014-07-01 00:00:00
abstract::: The 2008 European Society of Cardiology/European Society of Hypertension guidelines recommend the first-line prescription of two antihypertensive drugs in single-pill combinations (SPCs), also known as fixed-dose combinations, for the treatment of most patients with hypertension. This recommendation is based on a la...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000002598
更新日期:2020-12-01 00:00:00
abstract:OBJECTIVES:The global morbidity and mortality related to hypertension and associated disorders increases continuously and novel therapeutic strategies are still in high demand. Increasing evidence suggests the important role in blood pressure regulation of cytochrome P-450-dependent metabolites of arachidonic acid. Epo...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0000000000002462
更新日期:2020-09-01 00:00:00
abstract:AIMS:The addition of an aldosterone receptor antagonist on top of current optimal therapy (based on angiotensin II inhibition) has demonstrated an important clinical benefit in heart failure patients with systolic dysfunction. Whether this finding also applies to heart failure patients with preserved systolic function ...
journal_title:Journal of hypertension
pub_type: 杂志文章
doi:10.1097/HJH.0b013e328364abd6
更新日期:2013-11-01 00:00:00