Abstract：
:The effects of variations in serum concentrations of potassium on the occurrence and severity of ischemia- and reperfusion-induced arrhythmias have been studied in conscious rats. Serum potassium concentrations were modified by maintaining rats on diets which varied in potassium concentration, by treatment with hydrochlorothiazide, amiloride, spironolactone or infusions of potassium chloride. An inverse linear relationship was demonstrated between ischemia-induced arrhythmias and log(e) serum potassium concentration such that a 50% reduction in arrhythmias occur with a 3.8-fold increase in serum potassium concentration. On the other hand, the incidence of reperfusion-induced arrhythmias after 7 min of regional ischemia prior to reperfusion in previously untreated rats were not influenced by elevation of serum potassium concentrations prior to and after reperfusion. Effects on ischemia-induced arrhythmias could not be explained by changes in blood pressure or heart rate. It is speculated that modification of potassium concentration in non-ischemic or border zone ventricular tissue may directly modify arrhythmogenesis due to ischemia but not that due to reperfusion.
journal_name
J Mol Cell Cardioljournal_title
Journal of molecular and cellular cardiologyauthors
Saint KM,Abraham S,MacLeod BA,McGough J,Yoshida N,Walker MJdoi
10.1016/0022-2828(92)93384-vkeywords:
subject
Has Abstractpub_date
1992-07-01 00:00:00pages
701-9issue
7eissn
0022-2828issn
1095-8584pii
0022-2828(92)93384-Vjournal_volume
24pub_type
杂志文章abstract：:The electrophysiological heterogeneity that exists across the ventricular wall in the mammalian heart has long been recognized, but remains an area that is incompletely understood. Experimental studies of the mechanisms of arrhythmogenesis in the whole heart often examine the epicardial surface in isolation and thereb...
journal_title：Journal of molecular and cellular cardiology
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abstract：:Cardioprotection and preconditioning mediated via G-protein-coupled receptors may be lost or impaired with advancing age, limiting ischemic tolerance and the ability to pharmacologically protect older hearts from ischemic injury. Our preliminary findings indicated a loss of delta-opioid receptor-mediated protection in...
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abstract：:Milrinone, a potent positive inotropic and vasodilating agent, has shown promise in the clinical treatment of congestive heart failure, but significant controversy about its mechanism of action exists. To approach these mechanistic problems in a non-innervated, non-diffusion-limited system, the effects of milrinone on...
journal_title：Journal of molecular and cellular cardiology
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更新日期：1987-01-01 00:00:00
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journal_title：Journal of molecular and cellular cardiology
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journal_title：Journal of molecular and cellular cardiology
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pub_type： 杂志文章,评审
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abstract：:We used three interventions to test critically the theory that ischemic preconditioning is the result of translocation of cytosolic protein kinase C (PKC) into the membranes where it can be activated. If that theory were true then kinase activity should not be necessary during the preconditioning ischemia and thus blo...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1006/jmcc.1994.1078
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abstract：:Previous studies have demonstrated that in different cardiac preparations action potential duration (APD) increases with age. As in various species, thyroid hormone levels increase developmentally, and since hyperthyroidism shortens APD while hypothyroidism prolongs it, we hypothesized that developmental changes in AP...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/0022-2828(91)90212-5
更新日期：1991-07-01 00:00:00
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journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/0022-2828(92)91870-b
更新日期：1992-09-01 00:00:00
abstract：:Recent evidence has shown that the cardioprotection afforded by the late phase of ischemic preconditioning (PC) is mediated by upregulation of inducible nitric oxide synthase (iNOS). However, the specific cardiac cell type(s) that express(es) iNOS in response to ischemic PC remains unknown. Thus, mice underwent a sequ...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1006/jmcc.2001.1482
更新日期：2002-01-01 00:00:00
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journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/0022-2828(95)90090-x
更新日期：1995-02-01 00:00:00
abstract：:In this study, we looked into possible compensatory changes of other adenosine receptors (ARs) in A(2A) genetic knockout mice (A2AKO) as well as the functional role of nitric oxide (NO) in A(2A) AR-mediated vasodilation. Gene expression of ARs from coronary arteries of A(2A) AR wild type mice (A2AWT) and A2AKO was stu...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2008.03.003
更新日期：2008-05-01 00:00:00
abstract：:Age-associated cardiovascular diseases are at least partially ascribable to vascular cell senescence. Replicative senescence (RS) and stress-induced premature senescence (SIPS) are provoked respectively by endogenous (telomere erosion) and exogenous (H2O2, UV) stimuli resulting in cell cycle arrest in G1 and G2 phases...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2015.01.012
更新日期：2015-04-01 00:00:00
abstract：:Function and various parameters of myocardial substrate and energy metabolism were measured in preload-controlled isolated working guinea-pig hearts perfused with normoxic (95% O2) and hypoxic (30 to 45% O2) Krebs-Henseleit buffers ([Ca2+] = 1.25 mM). Energy-yielding substrates were glucose, pyruvate, lactate, and fat...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
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abstract：:Although 17beta-estradiol (E2) administration following trauma-hemorrhage (T-H) improves cardiac function in male rodents, it is not known whether the salutary effects of E2 are mediated via estrogen receptor (ER)-alpha or ER-beta, and whether cardiac heat shock proteins (Hsp) are affected by E2 administration. Male S...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2005.10.001
更新日期：2006-01-01 00:00:00
abstract：:Oxidative stress can be generated at several sites within the mitochondria. Among these, monoamine oxidase (MAO) has been described as a prominent source. MAOs are mitochondrial flavoenzymes responsible for the oxidative deamination of catecholamines, serotonin and biogenic amines, and during this process they generat...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章,评审
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更新日期：2014-08-01 00:00:00
abstract：:Recent improvements in survival from AIDS have been accompanied by an increased recognition of the potential importance of other manifestations of HIV infection, including cardiomyopathy. Mechanisms responsible for HIV cardiomyopathy are unknown, but may include direct effects of HIV proteins on the heart. We previous...
journal_title：Journal of molecular and cellular cardiology
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doi：10.1016/j.yjmcc.2005.10.006
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abstract：:Gain- and loss-of-function strategies using transgenic over-expression and targeted ablation of candidate genes in in the mouse have provided important mechanistic insights into cardiovascular development, physiology and disease. An essential, but challenging step is the functional analysis of the resultant phenotype....
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章,评审
doi：10.1006/jmcc.2000.1294
更新日期：2001-01-01 00:00:00
abstract：:The binding properties of [3H]U69593, a selective k-ligand, in rat heart homogenates were characterized by direct and displacement receptor binding assays. It was found that there are substantial specific [3H]U69593 binding sites in the rat heart. They were saturable, reversible and stereospecific. Both association an...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/0022-2828(91)90086-2
更新日期：1991-11-01 00:00:00
abstract：:The Raf/MAPK/ERK kinase (Mek)/extracellular signal-regulated kinases (Erk) pathway is activated in cardiac hypertrophy after a myocardial infarction. Although heat-shock protein 90 (Hsp90) may regulate the Raf/Mek/Erk signal pathway, the role of Hsp90 in pathophysiological cardiac hypertrophy remains unclear. In this ...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2018.12.010
更新日期：2019-02-01 00:00:00
abstract：:During systole, Ca2+ is released from the sarcoplasmic reticulum (SR) through ryanodine receptors (RyRs) while, simultaneously, other ions (specifically K+, Mg2+, and Cl-) provide counter-ion flux. These ions move back into the SR during diastole through the SERCA pump and SR K+ and Cl- channels. In homeostasis, all i...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2016.10.018
更新日期：2017-02-01 00:00:00
abstract：:Transgenic mice with cardiac-specific overexpression of G alpha q exhibit a biochemical and physiological phenotype of load-independent cardiac hypertrophy with contractile dysfunction. To elucidate the cellular basis for altered contractility, we measured cellular contraction, Ca(2+)transients, and l -type Ca(2+)chan...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1006/jmcc.1999.0966
更新日期：1999-07-01 00:00:00
abstract：:To test a prediction that trans-sarcolemmal lactate movement is carrier mediated, 14C-labelled lactate or pyruvate and 3H-mannitol were transiently infused (2 min) into aerobically perfused rat hearts that had been depleted of intracellular monocarboxylates by a 30 min pre-perfusion in the absence of substrates. Uptak...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/s0022-2828(85)80079-1
更新日期：1985-10-01 00:00:00
abstract：:Serine 727 (Ser727) phosphorylation of STAT3 plays a role in the regulation of mitochondrial respiration. This study aimed to test if zinc could regulate mitochondrial respiration through phosphorylation of STAT3 at Ser727 in the setting of ischemia/reperfusion in the heart. Under normoxic conditions, treatment of iso...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1016/j.yjmcc.2018.03.019
更新日期：2018-05-01 00:00:00
abstract：:Ventricular hypertrophy is associated with an increase in action potential (AP) duration which is potentially arrhythmogenic. The implication of the Na-Ca exchange current (I(Na-Ca)) in the lengthening of the AP is controversial. The role of this current in the increased duration of the low plateau of the AP in hypert...
journal_title：Journal of molecular and cellular cardiology
pub_type： 杂志文章
doi：10.1006/jmcc.2000.1106
更新日期：2000-04-01 00:00:00
abstract：:Platelet-derived growth factor (PDGF) has protean manifestations, including the regulation of growth and migration, in many cell types. We have previously reported that PDGF-BB induces the accumulation of monocyte chemoattractant protein (MCP)-1 mRNA in smooth muscle cells (SMC), in large part due to an increase in mR...
journal_title：Journal of molecular and cellular cardiology
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