Abstract:
:We studied the effects of maprotiline, a tetracyclic antidepressant agent, on transmembrane potentials recorded from papillary muscles of guinea pigs and sinoatrial nodes of rabbits, using standard microelectrode techniques. Maprotiline (10-100 microM) produced dose-dependent decreases in the maximum rate of rise (Vmax) and action potential duration in papillary muscles, while the resting potential (Em) was not significantly affected. Maprotiline also shifted the Vmax-Em relation to more negative potentials. The slow action potentials of papillary muscles elicited by high [K+]o were also depressed by the drug application. In sinoatrial node cells, maprotiline (above 10 microM) reduced heart rate, Vmax, and action potential amplitude, and increased the action potential duration at half-amplitude. The slope of the phase 4 depolarization was decelerated by the drug. These results suggest that maprotiline depresses not only the fast inward sodium current but also the slow inward calcium current, and that relatively high concentrations of maprotiline exert an inhibitory effect on the electrical activity of the fast- and slow-response fibers of the hearts.
journal_name
J Cardiovasc Pharmacoljournal_title
Journal of cardiovascular pharmacologyauthors
Igawa O,Kotake H,Kurata Y,Saitoh M,Fujimoto Y,Hasegawa J,Mashiba Hsubject
Has Abstractpub_date
1988-02-01 00:00:00pages
167-73issue
2eissn
0160-2446issn
1533-4023journal_volume
11pub_type
杂志文章abstract::Endothelin-1 (ET-1) is a 21-amino-acid local and circulating factor whose plasma concentrations are increased in advanced atherosclerosis. ET-1 is cleaved from a prohormone (big ET-1) by endothelin-converting enzymes (ECEs) into the biologically active mature form which mediates vasoconstriction and cell proliferation...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199800001-00009
更新日期:1998-01-01 00:00:00
abstract:OBJECTIVE:Genetic loci predict <5% of variation in low-density lipoprotein cholesterol (LDL-C) response to statins. Cholestanol and desmosterol are plasma markers of cholesterol absorption and synthesis, respectively. Because statins lower LDL-C by inhibiting cholesterol synthesis, we studied the relationship between c...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
doi:10.1097/FJC.0b013e3181f09bcb
更新日期:2010-10-01 00:00:00
abstract::Glycogen synthase kinase (GSK)-3beta inhibitors play an anti-inflammatory role in several inflammatory diseases. Recent studies have demonstrated that GSK-3beta inhibitors protect against myocardial ischemia-reperfusion injury. However, the precise mechanisms remain unclear. We aimed to investigate the roles of inflam...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e318186a84d
更新日期:2008-09-01 00:00:00
abstract::We examined the involvement of the oxidative stress in high glucose-induced suppression of human aortic endothelial cell proliferation. Chronic glucose treatment for 72 h concentration-dependently (5.6-22.2 mol/l) inhibited human coronary endothelial cell proliferation. Temocaprilat, an angiotensin-converting enzyme i...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200312001-00013
更新日期:2003-12-01 00:00:00
abstract::To determine whether the vasoconstrictor response to endothelin-1 (ET-1) is altered in coronary vessels of hypertensive hearts and the role of ETA and ETB receptors in these responses to ET-1, the vasoconstrictor response to ET-1 in coronary vessels was measured with or without ETA and ETB receptor antagonists. In iso...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199800001-00029
更新日期:1998-01-01 00:00:00
abstract::Measurements of cerebrospinal fluid (CSF) catecholamines (CA) were made in an attempt to estimate the activity of central CA neurons in essential hypertension (EHT). CSF norepinephrine (NE), epinephrine (EPI), and dopamine (DA) levels were measured in 12 normotensive (age 36 +/- 3 years; SBP = 116 +/- 4 and DBP = 79 +...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章,评审
doi:
更新日期:1987-01-01 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::We examined the actions of the isopropyl ester of palmitoyl carnitine (P1Pi), a novel vasodilator compound, on coronary constriction mediated by the calcium channel activator BAY K 8644 and positive inotropic responses mediated by norepinephrine (NE) and low sodium perfusion in perfused rat hearts. Langendorff-perfuse...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199506000-00003
更新日期:1995-06-01 00:00:00
abstract::We examined mechanisms of the central sympathoinhibitory actions of systemically administered clonidine in anesthetized cats. To avoid influences of sympathetic chemo- and baroreflexes, the animals were deafferentated by cutting the carotid sinus and vagal nerves bilaterally. Intravenous (i.v.) injections of clonidine...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199904000-00002
更新日期:1999-04-01 00:00:00
abstract::Statins are known to have cholesterol-independent pleiotropic effects, such as upregulation of the enzyme ecto-5'-nucleotidase. These effects may contribute to the protective effect of statins against ischemia and reperfusion (IR). Interestingly, pleiotropic effects have been shown to differ between hydrophilic and li...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,随机对照试验
doi:10.1097/FJC.0b013e318232b1a4
更新日期:2012-01-01 00:00:00
abstract::Baroreflex control of renin release following acute and prolonged blood pressure reduction by felodipine administration was investigated in conscious spontaneously hypertensive rats (SHR) fitted with arterial and venous catheters. Basal values of mean arterial pressure (MAP), heart rate (HR), and plasma renin activity...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1987-01-01 00:00:00
abstract::We previously reported that i.v. DAMGO (Tyr-D-Ala-Gly-NMePhe-Gly-ol), a selective mu-opioid agonist, causes an increase in blood pressure with no change in heart rate in unanesthetized sheep and subsequently demonstrated that DAMGO attenuates baroreflex-mediated bradycardia. To determine the site and mechanism by whic...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200002000-00014
更新日期:2000-02-01 00:00:00
abstract::The cardiovascular profile of SC-36602, a new class 1A/1B antiarrhythmic agent, was compared to those of disopyramide, lidocaine, mexiletine, flecainide, encainide, lorcainide, and quinidine. These drugs were compared at their respective canine antiarrhythmic doses in a hemodynamic evaluation using anesthetized dogs. ...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1988-06-01 00:00:00
abstract::Cultured vascular smooth muscle cells derived by enzymatic dissociation of rabbit aortic media were used for study of alpha 1-adrenergic receptors (AAR) and receptor-coupled calcium flux. AAR were characterized by binding of the alpha 1-selective radioligand [3H]prazosin, and norepinephrine-stimulated 45calcium efflux...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:
更新日期:1985-01-01 00:00:00
abstract::Few studies have addressed the possibility that brain natriuretic peptide (BNP) possesses a profile of bioactivity that is distinct from that of atrial natriuretic peptide (ANP). Accordingly, we assessed the biologic actions of BNP in the setting of maximal or near-maximal ANP-induced biologic activity. Background ANP...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199902000-00008
更新日期:1999-02-01 00:00:00
abstract::The pharmacologic properties of a novel nonpeptide endothelin (ET) receptor antagonist, S-1255 ([R]-[+]-2-[benzo(1,3)dioxol-5-yl]-6-isopropyl-4-[4-methoxyphenyl]-2H-chromene-3-carboxylic acid), was studied. [3H]S-1255 specifically bound to porcine aortic smooth muscle membranes expressing only ET(A) receptors with a K...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200104000-00014
更新日期:2001-04-01 00:00:00
abstract::We isolated two candidates for endogenous digitalis-like factors from human urine based on the inhibition of [3H]ouabain binding to intact human erythrocytes. The more-polar ouabain-displacing compound-1 (ODC-1) closely resembled ouabain in biological, physicochemical, and chromatographic properties. Moreover, anti-ou...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199322002-00019
更新日期:1993-01-01 00:00:00
abstract::To evaluate the role of angiotensin II (AII) on diastolic function during post-myocardial infarction (MI) ventricular remodeling, coronary ligation or sham operation was performed in male Sprague-Dawley rats. Experimental animals were maintained on either irbesartan, a selective AT1-receptor antagonist, or no treatmen...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199903000-00014
更新日期:1999-03-01 00:00:00
abstract::Both in the periphery and in the central nervous system, alpha-adrenoceptors can be subdivided into alpha 1-types. alpha 1-Receptors are sensitive to low concentrations of the agonists phenylephrine and methoxamine, and of the antagonists corynanthine and prazosin. alpha 1-Receptors are sensitive to low concentrations...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198200041-00002
更新日期:1982-01-01 00:00:00
abstract::Epoxyeicosatrienoic acids, substrates for soluble epoxide hydrolase (sEH), exhibit vasodilatory and antihypertrophic activities. Inhibitors of sEH might therefore hold promise as heart failure therapeutics. We examined the ability of sEH inhibitors GSK2188931 and GSK2256294 to modulate cardiac hypertrophy, fibrosis, a...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/FJC.0b013e31827fe59c
更新日期:2013-04-01 00:00:00
abstract::We studied the acute hemodynamic effects of PN 200-110, a newly available calcium antagonist, in 12 patients with severe congestive heart failure. Measurements of cardiac performance were obtained by a right heart catheter before and after administration of 5 and 15 mg of PN. Peak drug effects occurred 1-2 h following...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198708000-00009
更新日期:1987-08-01 00:00:00
abstract::We studied 11 previously refractory hypertensive subjects who were treated with minoxidil, propranolol, and diuretics for 2--7 years. During this time 70 random blood samples were collected in the supine position and analyzed for plasma norepinephrine (PNE) and plasma renin activity (PRA). The mean PNE was 546 pg/ml (...
journal_title:Journal of cardiovascular pharmacology
pub_type: 临床试验,杂志文章
doi:10.1097/00005344-198001000-00001
更新日期:1980-01-01 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::We compared the tolerance-inducing effects of nitroglycerin (NTG) and nicorandil (NIC) in porcine isolated coronary arteries and assessed the role of KATP channels in the response to NIC in nitrate-tolerant and nontolerant preparations. In coronary arteries contracted with U46619 (1-3 x 10(-9) M), NTG, NIC, sodium nit...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199606000-00010
更新日期:1996-06-01 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::To evaluate the interaction between renal nerves, the atrial natriuretic peptide (ANP), and the renin-angiotensin system (RAS), electrical stimulation of renal nerves was performed in spontaneously hypertensive rats (SHR) and in their normotensive controls, Wistar Kyoto rats (WKY), before and after pharmacologic treat...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199611000-00009
更新日期:1996-11-01 00:00:00
abstract::The cardiac and renal hemodynamic effects of SE2395, a beta-blocking agent, were examined after intravenous administration (50 micrograms/kg) in normotensive conscious dogs. Beta-blocking action of SE2395 was evidenced by a reduction in heart rate and cardiac output without change in the mean arterial pressure. An inc...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-198511000-00029
更新日期:1985-11-01 00:00:00
abstract::We investigated the endothelin (ET) receptors involved in the vasoconstrictor responses to ET-1 in rat pulmonary arteries and arterioles and the effect of endothelium removal, nitric oxide (NO) synthase inhibition, and hypoxia on ET-1-induced responses in the arteries. In isolated rat pulmonary artery rings (2-3 mm ID...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-199405000-00022
更新日期:1994-05-01 00:00:00
abstract::Metabolic and immune systems are among the most fundamental requirements for survival. Many metabolic and immune response pathways or nutrient- and pathogen-sensing systems are evolutionarily conserved throughout species. As a result, the immune response and metabolic regulation are highly integrated and the proper fu...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章,评审
doi:10.1097/FJC.0000000000000704
更新日期:2019-10-01 00:00:00
abstract::The effects of streptozotocin (STZ)-induced diabetes (DM) and insulin on cardiac performance were investigated during reperfusion after low-flow ischemia in rats. Hearts were isolated 4 weeks after intravenous injection of STZ (65 mg/kg) or vehicle and retrogradely perfused in the presence (throughout the perfusion pe...
journal_title:Journal of cardiovascular pharmacology
pub_type: 杂志文章
doi:10.1097/00005344-200210000-00001
更新日期:2002-10-01 00:00:00