Abstract:
:Cardiovascular disease is a major killer in postmenopausal women in the industrialized societies. To investigate the effect of progestogen and 17 beta-estradiol replacement therapy on atherogenesis, we studied 60 cholesterol-fed ovariectomized rabbits for 13 weeks. They were randomly assigned to four groups of 15 rabbits each and received oral treatment with norethisterone acetate, levonorgestrel, 17 beta-estradiol, or placebo. The active treatment groups achieved serum hormone concentrations, which produced physiological effects on the uterus. No significant differences in serum total cholesterol or ultracentrifuged lipoproteins (very low density, intermediate density, low density, or high density lipoproteins) were found between the four groups during the experimental period. There were no significant differences between the progestogen and placebo groups in the aortic accumulation of cholesterol. The estradiol group had only accumulated about half the aortic cholesterol as compared with the placebo group and the progestogen groups (p less than 0.05). The antiatherogenic effect of 17 beta-estradiol was estimated to be equal to a 40-50% reduction in serum total cholesterol. These findings suggest that two commonly prescribed 19-nortestosterone-derived progestogens, which are considered to be "atherogenic," do not affect atherogenesis in cholesterol-fed ovariectomized rabbits, whereas 17 beta-estradiol produces a significant antiatherogenic effect that is independent of lipid metabolism in plasma, possibly the result of a direct action on the arterial wall.
journal_name
Circ Resjournal_title
Circulation researchauthors
Haarbo J,Svendsen OL,Christiansen Cdoi
10.1161/01.res.70.6.1198subject
Has Abstractpub_date
1992-06-01 00:00:00pages
1198-202issue
6eissn
0009-7330issn
1524-4571journal_volume
70pub_type
杂志文章abstract::Transmural heterogeneity of myocardial metabolism and function are present in the left ventricle under normal and ischemic conditions. To determine if endocardial versus epicardial differences of [Ca2+]i are also present, perfused rat heart studies using indo-1 fluorescence as an index of [Ca2+]i were performed in the...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.72.5.1082
更新日期:1993-05-01 00:00:00
abstract::Canine cardiac Purkinje cells contain both L- and T-type calcium currents, yet the single Ca2+ channels have not been characterized from these cells. Additionally, previous studies have shown an overlap between the steady-state inactivation and activations curves for L-type Ca2+ currents, suggesting the presence of L-...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.70.3.456
更新日期:1992-03-01 00:00:00
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pub_type: 杂志文章
doi:10.1161/01.res.43.2.293
更新日期:1978-08-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.111.300285
更新日期:2013-03-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.115.306996
更新日期:2015-12-04 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.55.5.580
更新日期:1984-11-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.118.312821
更新日期:2018-05-25 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.66.6.1755
更新日期:1990-06-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.116.309301
更新日期:2016-12-09 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.110.236596
更新日期:2011-02-18 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章,评审
doi:10.1161/CIRCRESAHA.118.311378
更新日期:2018-09-14 00:00:00
abstract::The epicardium, the tissue layer covering the cardiac muscle (myocardium), develops from the proepicardium, a mass of coelomic progenitors located at the venous pole of the embryonic heart. Proepicardium cells attach to and spread over the myocardium to form the primitive epicardial epithelium. The epicardium subseque...
journal_title:Circulation research
pub_type: 杂志文章,评审
doi:10.1161/CIRCRESAHA.111.245589
更新日期:2011-12-09 00:00:00
abstract::The aim of this study was to determine the mechanism of action of norepinephrine (NE) on arterial baroreceptors (BRs), with the focus on regularly discharging, presumably myelinated fibers. With the use of an in vitro aortic arch/aortic nerve preparation from rats, BR single-fiber discharge was recorded simultaneously...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.61.3.409
更新日期:1987-09-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.57.1.55
更新日期:1985-07-01 00:00:00
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journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000253533.65446.33
更新日期:2006-12-08 00:00:00
abstract::High affinity binding sites of angiotensin II (A II) have been characterized in rabbit renomedullary interstitial cells in tissue culture. Binding was rapid, specific, and saturable. Scatchard analysis of steady state saturation binding data at 22 degrees C indicated a single binding site with an equilibrium dissociat...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.46.6.802
更新日期:1980-06-01 00:00:00
abstract::Controversy exists regarding the mechanism by which catecholamines stimulate renin secretion in vivo. A sensitive rat kidney slice system was utilized to study the direct effects of adrenergic agonists and antagonists on renin release in vitro. Catecholamines were protected from degradation by the addition of ascorbic...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.37.3.318
更新日期:1975-09-01 00:00:00
abstract::Rationale: The overuse of antibiotics has been an important clinical issue, and antibiotic exposure is linked to alterations in gut microbiota, which has been related to risks of various chronic diseases such as cardiovascular disease and cancer. Also, duration of antibiotic exposure may be a risk factor of premature ...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.119.315279
更新日期:2020-01-31 00:00:00
abstract::We have identified immunologically the protein kinase C (PKC) isoforms present in rat mesenteric small arteries, defined their distribution between particulate and soluble fractions, and studied their involvement in phorbol ester-induced contraction. Our analysis revealed the presence of the CA(2+)-dependent PKCs (alp...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.78.5.806
更新日期:1996-05-01 00:00:00
abstract:RATIONALE:Atherosclerosis proceeds through a multistep reaction that begins with endothelial injury caused by a host of stress signals, among which oxidized low-density lipoprotein (oxLDL) plays a critical role. OxLDL disrupts normal functionality of the endothelium by upregulating adhesion molecules (eg, ICAM-1) and c...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.111.240655
更新日期:2011-04-01 00:00:00
abstract::Pulsatile pulmonary hemodynamics were analyzed in a chronic awake canine high flow model. Standard mean flow and pulsatile flow hemodynamics were measured and alterations in the proximal pulmonary vascular physical properties were quantified by the characteristic impedance (Zo). Pulmonary vascular resistance (PVR), wh...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.45.2.267
更新日期:1979-08-01 00:00:00
abstract:RATIONALE:Carriers of the most common prothrombotic mutations FVL (factor V Leiden) and FII (prothrombin) 20210G>A show a highly variable clinical phenotype. Using standardized in vivo coagulation activation followed by activity pattern analysis we have recently shown, that the FVL mutation accelerates thrombin and APC...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.119.315037
更新日期:2019-08-16 00:00:00
abstract::Previous studies have demonstrated a role for voltage-gated K+ (Kv) channel alpha subunits of the Kv4 subfamily in the generation of rapidly inactivating/recovering cardiac transient outward K+ current, I(to,f), channels. Biochemical studies suggest that mouse ventricular I(to,f) channels reflect the heteromeric assem...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000196559.63223.aa
更新日期:2005-12-09 00:00:00
abstract::Angiotensin II and its metabolites, [des-Asp-1]-angiotensin II (angiotensin III), [des-(Asp-1,Arg-2)]angiotensin II, and [des-(Asp-1,Arg-2,val-3)]angiotensin II, were measured in arterial and venous plasma from normal rats. Paper chromatography was used to separate the peptides which were measured with a radioimmunoas...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.38.6.122
更新日期:1976-06-01 00:00:00
abstract:RATIONALE:Wnt signaling regulates key aspects of diabetic vascular disease. OBJECTIVE:We generated SM22-Cre;LRP6(fl/fl);LDLR(-/-) mice to determine contributions of Wnt coreceptor low-density lipoprotein receptor-related protein 6 (LRP6) in the vascular smooth muscle lineage of male low-density lipoprotein receptor-nu...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.117.306712
更新日期:2015-07-03 00:00:00
abstract::Congenital heart disease (CHD) is the most common congenital anomaly in newborn babies. Cardiac malformations have been produced in multiple experimental animal models, by perturbing selected molecules that function in the developmental pathways involved in myocyte specification, differentiation, or cardiac morphogene...
journal_title:Circulation research
pub_type: 杂志文章,评审
doi:10.1161/CIRCRESAHA.112.300853
更新日期:2013-02-15 00:00:00
abstract::Leukocyte rolling along the endothelium in inflammation is caused by continuous formation and breakage of bonds between selectin adhesion molecules and their ligands. We investigated trauma-induced leukocyte rolling in venules (diameter, 23 to 58 microns; wall shear stress, 1.2 to 35 dyne/cm2) of the exteriorized rat ...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.79.6.1122
更新日期:1996-12-01 00:00:00
abstract::The purpose of this study was to determine whether a cyclic adenosine 3',5'-monophosphate-dependent process can be involved in the regulation of vascular smooth muscle alpha 1-adrenergic receptor responsiveness. Experiments were performed in cultured rabbit aortic smooth muscle cells which were characterized previousl...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.58.2.292
更新日期:1986-02-01 00:00:00
abstract::Pharmacological evidence indicates that angiotensin (Ang II) converting enzyme inhibitors attenuate cardiovascular responses to sympathetic stimulation. To investigate the physiological significance of this attenuation, the pressor and heart rate responses to bilateral carotid occlusion (BCO) were studied before and a...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.66.3.662
更新日期:1990-03-01 00:00:00
abstract::Platelet-activating factor (acetyl-glyceryl-ether-phosphorylcholine; 1-O-alkyl-2-O-acetyl-sn-glycero-3-phosphorylcholine), which is released by stimulated neutrophils and platelets, possesses the ability to alter vascular tone and permeability and to activate various formed blood elements. We have characterized the he...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.58.2.218
更新日期:1986-02-01 00:00:00