Abstract:
:Coronary artery reperfusion established by thrombolytic agents early in the evolution of an acute myocardial infarction is known to result in the salvage of otherwise jeopardized heart muscle. Recently, experimental evidence has suggested that reactive products of oxygen are formed as a result of reperfusion and can increase the amount of myocardial tissue that becomes irreversibly damaged. The purpose of the present study was to determine if the thrombolytic agent, streptokinase, could serve to scavenge reactive species of oxygen, thereby protecting the myocardium by a mechanism independent of its ability to lyse an occlusive thrombus. Rabbit isolated hearts were perfused at a constant rate with Krebs-Henseleit buffer (25 ml/min, 31 degrees C, pH 7.4) using a modified Langendorff method. Changes in the permeability of the coronary vascular bed were determined with 125I-labeled albumin added to the perfusion buffer. An intraventricular fluid-filled latex balloon connected to a pressure transducer maintained the left ventricle in an isovolumic state and was used to detect changes in myocardial contractility throughout the study protocol. Electrolysis of the oxygenated Krebs-Henseleit perfusion buffer with a 20 mA direct current for 2 min, delivered with a stainless-steel anode (proximal) and a platinum cathode (distal), resulted in the generation of reactive products of oxygen. Perfusion of the isolated heart with buffer containing the products of electrolysis resulted in an increase in mean coronary artery perfusion pressure, from 48 +/- 3 to 121 +/- 6 mm Hg [mean +/- SEM (n = 17)], and an increase in the left ventricular end-diastolic pressure, from 10 +/- 1 to 54 +/- 6 mm Hg. The addition of streptokinase (150 U/ml) or heparin (20 U/ml) to the perfusion medium attenuated the observed increase in coronary artery perfusion pressure from 42 +/- 3 to 73 +/- 9 mm Hg (n = 9) or from 43 +/- 2 to 98 +/- 9 mm Hg (n = 9), respectively. In addition, streptokinase prevented the increase in the left ventricular end-diastolic pressure (11 +/- 1 to 36 +/- 5 mm Hg, n = 9) and preserved left ventricular function as determined by the pressure-volume relationship. Myocardial accumulation of 125I-labeled albumin after exposure of the heart to the reactive products of oxygen was attenuated by the addition of streptokinase or heparin to the buffer solution. The data suggest that streptokinase and, to a lesser extent, heparin may preserve myocardial and coronary vascular function by scavenging reactive oxygen species.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Mickelson JK,Simpson PJ,Jackson CV,Lucchesi BRdoi
10.1097/00005344-198808000-00009subject
Has Abstractpub_date
1988-08-01 00:00:00pages
186-95issue
2eissn
0160-2446issn
1533-4023journal_volume
12pub_type
杂志文章abstract::We compared the effects of angiotensin II (AII), enalapril, and losartan given by acute intravenous (i.v.) injection, on cardiac baroreflex sensitivity in two groups of conscious normotensive rabbits bred for high gain [> 5 beats/min/mm Hg] (group I) and low gain [< 4 beats/min/mm Hg] (group II) of the mean arterial b...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199503000-00024
更新日期:1995-03-01 00:00:00
abstract::Isolated systolic hypertension (ISH) is a definite risk factor for cardiovascular complications (i.e., cardiac failure, coronary artery disease, and stroke) independent of diastolic elevation. The prevalence of ISH is estimated to be approximately 15-20% in the population above the age of 60 years, and increases with ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:
更新日期:1994-01-01 00:00:00
abstract::Our aim was to characterize and determine the function of endothelin (ET) receptor subtypes in human vascular tissue. Reverse transcriptase-polymerase chain reaction with nested oligonucleotide primers detected the presence of mRNA encoding both ETA and ETB receptors in the media from aorta and pulmonary and coronary ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199322008-00008
更新日期:1993-01-01 00:00:00
abstract::This study describes the hemodynamic dose-response characteristics of a titrated, continuous adenosine infusion before and 1 h (anesthetized), 1 week, and 1 year after coronary artery bypass graft (CABG) surgery. Average tolerated adenosine infusion rates were less 1 h and 1 week after surgery (128 +/- 23 and 118 +/- ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199703000-00005
更新日期:1997-03-01 00:00:00
abstract::Some calcium antagonists, including nitrendipine, were noted to cause a dose-dependent and reversible inhibition of insulin release in certain animal models. Therefore, it is important to know the effects of clinical treatment with calcium antagonists in nondiabetic or diabetic man. A review of the literature allows t...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:
更新日期:1984-01-01 00:00:00
abstract::This study was a multicenter, double-blind comparison of the antianginal efficacy and safety of amlodipine and placebo as adjunctive therapy with constant recommended maintenance doses of beta-blockers. Patients with stable exertional angina pectoris were randomized to placebo or amlodipine at a starting dose of 5 mg ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1097/00005344-199117001-00016
更新日期:1991-01-01 00:00:00
abstract::The purpose of this study was to determine the receptor subtype mediating enhanced contractile responses of aortae and mesenteric arteries from diabetic rats to the alpha-adrenoceptor agonists, norepinephrine, clonidine, and methoxamine and to establish whether the enhanced responses are associated with increased rele...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199008000-00010
更新日期:1990-08-01 00:00:00
abstract::The functional and anatomical abnormalities of the right ventricle may occur in hypertensive patients with left ventricular hypertrophy (LVH). The present study was designed to assess the functional and structural changes in both left and right ventricles induced by chronic antihypertensive therapy. Doppler and standa...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199117002-00039
更新日期:1991-01-01 00:00:00
abstract::Recently, we have reported two cases with endothelin (ET)-secreting tumor presenting with hypertension and elevated plasma endothelin-1 (ET-1) levels. The present study examines the histopathology of the ET-secreting tumor in one of these cases. The neoplasm was located in the skin and microscopically characterized as...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199100177-00111
更新日期:1991-01-01 00:00:00
abstract::Since the end of 1976 ten orally active converting enzyme inhibitors [SQ 14,225 (captopril), MK 421 (enalapril), MK 422, MK 521 (lysinopril), RHC 3659, CGS 13945, CGS 13928C, CGS 14824A, Hoe 498, S 9490-3, and Ro 31-2848] have been evaluated by our group in normal volunteers. Their ability to blunt the pressor respons...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/00005344-198507001-00002
更新日期:1985-01-01 00:00:00
abstract::Chronic stimulation of beta-adrenoceptors with isoproterenol induces alteration of vascular reactivity and increases local pro-inflammatory cytokines. We investigated whether fenofibrate and pioglitazone, PPAR-alpha and -gamma agonists, respectively, improve the changes in vascular reactivity induced by isoproterenol....
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e31818a8927
更新日期:2008-11-01 00:00:00
abstract::Forskolin exerts concentration-dependent positive inotropic effects in guinea pig isolated papillary muscles; resting potential, overshoot, and upstroke velocity remain unchanged. It markedly potentiates Ca2+-mediated action potentials elicited in partially depolarized myocardial fibers (increases in upstroke velocity...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
abstract::Angiotensin II receptor blockers (ARBs) are used for the treatment of patients with heart failure and hypertension. Yet their safety has been questioned by some who observed delayed cardiac healing and scar thinning after myocardial infarction (MI). To clarify potential efficacy and safety of ARBs, we administered Azi...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e318288a6d7
更新日期:2013-05-01 00:00:00
abstract::The selectivity of single oral doses of xamoterol, 200 mg, prenalterol, 50 mg, and salbutamol, 8 mg, was compared in eight healthy male volunteers by measuring their effects on sleeping heart rate, supine heart rate, blood pressure, forearm blood flow, finger tremor, and exercise heart rate in the presence and absence...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1097/00005344-198805000-00006
更新日期:1988-05-01 00:00:00
abstract:ABSTRACT:Lipid metabolism disorder and inflammatory response are considered to be the major causes of atherosclerogenesis. Astragalin, the most important functional component of flavonoid obtained from persimmon leaves, has the hypolipidemic effects. However, it is unknown, how astragalin protects against atheroscleros...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0000000000000944
更新日期:2020-10-30 00:00:00
abstract::Several 3,5-pyridinedicarboxylic acid [4-(2,3-dichlorophenyl)-1,4-dihydro-2,6-dimethyl-] esters, which are analogs to felodipine, were synthesized and tested for peroral activity and vascular selectivity. Structure-activity relationships demonstrate that felodipine has biological properties (selectivity and oral activ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198710001-00011
更新日期:1987-01-01 00:00:00
abstract::In fetal human left ventricular endocardial endothelial cells (EECLs), both plasma membrane (PM) ET(A)R and ET(B)R were reported to mediate ET-1-induced increase of intracellular calcium [Ca](i); however, this effect was mediated by ET(A)R in right EECs (EECRs). In this study, we verified whether, as for the PM, nucle...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0000000000000242
更新日期:2015-07-01 00:00:00
abstract::Calcium sensitizers increase myocardial contractile function without affecting Ca2+ homeostasis, which might be beneficial in the treatment of patients with heart failure. However, it remains uncertain whether Ca sensitizers induce quantitatively similar inotropic responses in control and failing hearts. To compare th...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200101000-00003
更新日期:2001-01-01 00:00:00
abstract::The genes for endothelin (ET) and their receptors are candidates for essential hypertension. Those for ET-1, ET-2 and the ET(A) receptor were selected for mutation scanning, and associated studies comparing untreated hypertensive patients and matched controls. A number of silent polymorphisms were found, resulting fro...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200000002-00010
更新日期:2000-01-01 00:00:00
abstract::Using the radioactive microsphere technique, we studied the acute systemic and regional hemodynamic effects of felodipine (10, 30, and 100 nmol/kg, i.v.) in conscious renal hypertensive rabbits. A dose-dependent decrease in arterial blood pressure was observed after felodipine administration, accompanied by tachycardi...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198407000-00025
更新日期:1984-07-01 00:00:00
abstract::Our previous study found that angiotensin-converting enzyme (ACE) inhibitors and amlodipine induce NO release from coronary microvessels through a kinin-dependent mechanism. The goal of this study was to determine whether amlodipine could potentiate NO formation during ACE inhibition. Coronary microvessels were isolat...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200002000-00004
更新日期:2000-02-01 00:00:00
abstract::The angiotensin II receptor-1 blockers have generally been shown to have antiatherogenic effects, and dendritic cells (DCs) are the most efficient antigen presenting cells that play an active role in the development of atherosclerosis through inflammatory-immune responses. Here, we tested the hypothesis that the antia...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e318258f336
更新日期:2012-08-01 00:00:00
abstract::The human cutaneous microcirculation has so far been studied by rather crude methods, such as plethysmography and 133Xn clearance. New sophisticated and noninvasive techniques are now available, with which the microcirculation of the skin can be continuously studied and measured for hours. With two such methods, i.e.,...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198500073-00007
更新日期:1985-01-01 00:00:00
abstract::We investigated the effects of a newly synthesized cardiotonic agent, TA-064, on helical strips of isolated canine cerebral, coronary, femoral, mesenteric, and renal arteries. TA-064 had no effect on isolated arterial strips under resting tension. When the arterial strips were partially contracted with prostaglandin F...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198309000-00017
更新日期:1983-09-01 00:00:00
abstract::The mechanisms of sustained ventricular tachycardia (VT) induced by large cumulative dose of cesium chloride (Cs) remains unclear. Seven anesthetized rabbits were intravenously injected with Cs (1 mmol/kg) 3 times at 20-min intervals. The surface ECG and monophasic action potential of the left ventricular endocardium ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199805000-00009
更新日期:1998-05-01 00:00:00
abstract::Cardiac hypertrophy occurs in response to increased workload, such as hypertension or valvular heart disease. Oxidative stress has been implicated in cardiac hypertrophy and in its transition to heart failure. This study was taken up with the objective to evaluate the role of oxidative stress in cardiomyoblast hypertr...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e3182756ad3
更新日期:2013-01-01 00:00:00
abstract::To investigate the antianginal action of nitroglycerin and nifedipine, systemic and right heart pressures, cardiac output, oxygen consumption, and radionuclide left ventricular ejection fraction and volume were measured in 14 men with stable effort angina and a positive exercise electrocardiogram. Exercise tests were ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198903000-00002
更新日期:1989-03-01 00:00:00
abstract::Atherosclerosis (AS), known as the chronic inflammatory disease, results from the dysfunction of vascular endothelial cells (VECs). Transforming growth factor-β1 (TGF-β1) has been reported to be induced by oxidized low-density lipoprotein (ox-LDL) and contribute to AS-related vascular endothelial cell damage. This wor...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0000000000000813
更新日期:2020-05-01 00:00:00
abstract::(+/-)-Dobutamine at concentrations < or =10(-5) M did not evoke contractions of rat gastric artery segments. However, when the tissues were contracted with methoxamine, (+/-)-dobutamine evoked concentration-dependent relaxation. The relaxant responses were not significantly affected by propranolol. In the same prepara...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199911000-00015
更新日期:1999-11-01 00:00:00
abstract::This study determined whether flavin adenine dinucleotide (FAD) may elicit vasodilation in conscious rats via release of preformed endothelium-derived nitrosyl factors. Injections 1-6 (inj(1-6)) of FAD (2.5 micromol/kg, IV) elicited pronounced and equivalent vasodilator responses in saline-treated rats. Inj(1) of FAD ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e31805c1646
更新日期:2007-08-01 00:00:00