Abstract:
:Myocardium which has been preconditioned by one or several brief episodes of ischemia has much slower energy utilization during a subsequent sustained episode of ischemia. Since preconditioned tissue also is 'stunned', the reduced energy utilization of preconditioned tissue may be due to reduced contractile effort. This study was done to assess whether differences in energy utilization persisted or disappeared under conditions of total ischemia, in vitro, when contractile activity was abolished in both control and preconditioned regions by hyperkalemic cardiac arrest. Preconditioned myocardium was produced in open-chest anesthetized dogs by exposing the circumflex bed to four 5-min episodes of ischemia each followed by 5 min of arterial reperfusion. Non-preconditioned anterior descending bed was used as control myocardium. Hearts were arrested with hyperkalemia after the last reperfusion period in order to reduce or eliminate the effects of contractile activity. Metabolite content was measured in sequential biopsies of the tissue. Large differences in the rate of energy metabolism of the two regions were noted during the first 15 minutes of ischemia. During this time, the preconditioned tissue utilized less glycogen, and produced less lactate, glucose-6-phosphate (G6P), glucose-1-phosphate (G1P), and alpha-glycerol phosphate (alpha GP), than did control myocardium. Moreover, there was a much smaller decrease in net tissue ATP in the preconditioned than in the control tissue. Thus, the decrease in the demand of preconditioned tissue for energy, which has been observed in vivo, persisted despite the elimination of differences in contractile effort between control and preconditioned myocardium. Although the cause of this decrease in energy demand in preconditioned myocardium remains unknown, the present results suggest that it is not due to concomitant stunning.
journal_name
J Mol Cell Cardioljournal_title
Journal of molecular and cellular cardiologyauthors
Jennings RB,Murry CE,Reimer KAdoi
10.1016/0022-2828(91)90190-wsubject
Has Abstractpub_date
1991-12-01 00:00:00pages
1449-58issue
12eissn
0022-2828issn
1095-8584pii
0022-2828(91)90190-Wjournal_volume
23pub_type
杂志文章abstract::The two-pore domain potassium (K(+)) channel TWIK-1 (or K2P1.1) contributes to background K(+) conductance in diverse cell types. TWIK-1, encoded by the KCNK1 gene, is present in the human heart with robust expression in the atria, however its physiological significance is unknown. To evaluate the cardiac effects of T...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2016.04.006
更新日期:2016-08-01 00:00:00
abstract::Doxorubicin (DOX)-induced cardiotoxicity has been a well-known phenomenon to clinicians and scientists for decades; however, molecular mechanisms underlying DOX cardiotoxicity are still being uncovered. Although the majority of prior research have implicated nuclear and mitochondrial events to be an important etiologi...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.yjmcc.2017.01.007
更新日期:2017-03-01 00:00:00
abstract::We studied peripheral skeletal muscle metabolism in monocrotaline-treated rats. Two distinct groups emerged: a percentage of the animals developed ventricular hypertrophy, with no signs of heart failure (compensated group), whilst others, besides ventricular hypertrophy, developed the syndrome of congestive heart fail...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.1996.0219
更新日期:1996-11-01 00:00:00
abstract::The ability of different substrates to affect myocardial function is well established but the mechanism for this effect has yet to be determined. To explore this area further, the studies described below were designed to determine the effect of different metabolic substrates, glucose or pyruvate, on myocardial respons...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/s0022-2828(86)80943-9
更新日期:1986-07-01 00:00:00
abstract:AIMS:During embryogenesis, the onset of circulatory blood flow generates a variety of hemodynamic forces which reciprocally induce changes in cardiovascular development and performance. It has been known for some time that these forces can be detected by as yet unknown mechanosensory systems which in turn promote cardi...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2020.03.013
更新日期:2020-06-01 00:00:00
abstract::Myocytes were isolated by Langendorff perfusion of rat or rabbit hearts with low calcium solution followed by collagenase and hyaluronidase, or by incubation of chunks of rat ventricular tissue in similar media. Cells were then placed in a bath on a microscope stage, superfused and electrically stimulated. Contraction...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/s0022-2828(88)80121-4
更新日期:1988-07-01 00:00:00
abstract::Since the recognition of the importance of calcium ions to cardiac contractility, the effects of alterations in calcium homeostasis on cardiac myocyte function have attracted immense attention. However, the possibility that changes in extracellular calcium concentration or the administration of calcium channel blocker...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.2000.1309
更新日期:2001-02-01 00:00:00
abstract::Disturbances of cellular calcium homeostasis due to oxidative stress are involved in reperfusion associated phenomena like myocardial stunning and reperfusion induced arrhythmias. This study investigates the effect of the major neutrophil-derived oxidant hypochlorous acid (HOCl) on the l-type calcium current (ICa,L) o...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.1998.0749
更新日期:1998-09-01 00:00:00
abstract::Genome-wide association studies (GWAS) have identified genetic variants in a number of chromosomal regions that are associated with atrial fibrillation (AF). The mechanisms underlying these associations are unknown, but are likely to involve effects of the risk haplotypes on expression of neighbouring genes. To invest...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2015.06.005
更新日期:2015-08-01 00:00:00
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journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2018.04.004
更新日期:2018-06-01 00:00:00
abstract::The opening of mitochondrial permeability transition pore (PTP) during reperfusion injury of heart has been well demonstrated and thus controlling PTP would attenuate the myocardial damage and cell death. Ursodeoxycholic acid (UDCA) is a hydrophilic bile salt and has been shown to prevent apoptosis in hepatocytes by i...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2005.07.014
更新日期:2005-11-01 00:00:00
abstract::To explore whether CaMKII-dependent phosphorylation events mediate reperfusion arrhythmias, Langendorff perfused hearts were submitted to global ischemia/reperfusion. Epicardial monophasic or transmembrane action potentials and contractility were recorded. In rat hearts, reperfusion significantly increased the number ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2011.08.010
更新日期:2011-12-01 00:00:00
abstract::An increase in circulating brain natriuretic peptide (BNP) but not atrial natriuretic factor (ANF) is observed coincident with cardiac allograft rejection that is reversed upon treatment with anti-lymphocyte therapy suggesting that pro-inflammatory cytokines may uniquely modulate BNP gene expression and secretion. Thi...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2004.01.001
更新日期:2004-04-01 00:00:00
abstract::In mammalian myocardium, muscle contraction is regulated by the rapid release of Ca2+ ions through ryanodine-sensitive Ca2+ release channels present in the intracellular membrane compartment, sarcoplasmic reticulum (SR). In this study, the effects of regional ischemia on intrinsic SR Ca2+ release channel function were...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/0022-2828(92)93181-i
更新日期:1992-10-01 00:00:00
abstract::Fibrosis, which is defined as excessive accumulation of fibrous connective tissue, contributes to the pathogenesis of numerous diseases involving diverse organ systems. Cardiac fibrosis predisposes individuals to myocardial ischemia, arrhythmias and sudden death, and is commonly associated with diastolic dysfunction. ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2013.12.013
更新日期:2014-02-01 00:00:00
abstract::In the mouse, genetic reduction in the Na(+), K(+)-ATPase alpha1 or alpha2 isoforms results in different functional phenotypes: heterozygous alpha2 isolated hearts are hypercontractile, whereas heterozygous alpha1 hearts are hypocontractile. We examined Na(+)/Ca(2+) exchange (NCX) currents in voltage clamped myocytes ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2005.03.023
更新日期:2005-07-01 00:00:00
abstract::Elevation of intracellular cAMP concentration has numerous vascular protective effects that are in part mediated via actin cytoskeleton-remodelling and subsequent regulation of gene expression. However, the mechanisms are incompletely understood. Here we investigated whether cAMP-induced actin-cytoskeleton remodelling...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2014.11.012
更新日期:2015-02-01 00:00:00
abstract::Mitochondria are central players in the pathophysiology of ischemia-reperfusion. Activation of plasma membrane G-coupled receptors or the Na,K-ATPase triggers cytosolic signaling pathways that result in cardioprotection. Our working hypothesis is that the occupied receptors migrate to caveolae, where signaling enzymes...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.yjmcc.2008.11.019
更新日期:2009-06-01 00:00:00
abstract::The contribution of endogenous NO to ischemia-reperfusion injury was studied in isolated perfused hearts of wild-type (WT) and endothelial NO synthase knockout (eNOS-) mice. The hearts were subjected to a 16-min period of global no-flow ischemia and were subsequently reperfused for 1 h. Cardiac contractile function wa...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.1998.0921
更新日期:1999-04-01 00:00:00
abstract::Human hearts with idiopathic dilated cardiomyopathy have diminished adenylate cyclase activity and increased amounts of the alpha-subunit of the inhibitory guanine nucleotide-binding regulatory protein (alpha Gi) as measured by pertussis toxin catalyzed ADP-ribosylation. We utilized specific antisera against synthetic...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/0022-2828(91)90168-l
更新日期:1991-04-01 00:00:00
abstract::Vascular cells are very sensitive to their hemodynamic environment. Any change in blood pressure or blood flow can be sensed by endothelial and vascular smooth muscle cells and ultimately results in structural modifications within the vascular wall that accommodate the new conditions. In the case of hypertension, the ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章,评审
doi:10.1016/j.yjmcc.2009.09.018
更新日期:2010-03-01 00:00:00
abstract::The specific activity of cardiac cathepsin B is significantly decreased by starvation and corticosteroid treatment in vivo, and by exposure of the heart in vitro to insulin, hydrocortisone and cycloheximide. Increases in cathepsin B activity occur following isoproterenol-induced cardiac damage in vivo and exposure in ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/0022-2828(83)90324-3
更新日期:1983-08-01 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::Mammalian cardiomyocytes withdraw from the cell cycle shortly after birth, although it remains unclear how cardiomyocyte cell cycles behave during development. Compared to conventional immunohistochemistry in static observation, time-lapse imaging can reveal comprehensive data in hard-to-understand biological phenomen...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2014.03.020
更新日期:2014-07-01 00:00:00
abstract::Reperfusion or reoxygenation of ischaemic or hypoxic cardiac tissue results in increases in total cell calcium and cell lysis both of which are dependent on mitochondrial function. Although changes which occur during this period of exposure of the tissue to hypoxia predispose the heart to take up calcium on reoxygenat...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1006/jmcc.1993.1107
更新日期:1993-08-01 00:00:00
abstract::Quin2 is a fluorescent Ca2+-sensitive indicator which in its acetoxymethyl ester form can be loaded into the cytosolic compartment of cells without any disruption of the plasma membrane. Quin2 has been used with many cell types to measure changes of [Ca2+]i in response to hormones and other stimuli. In this report we ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/s0022-2828(86)80919-1
更新日期:1986-05-01 00:00:00
abstract::Although it is generally accepted that actin and myosin isoforms adapt to their functional requirements, the sequence of expression of these proteins in hearts developing abnormally is unknown. In the chick embryo it is possible to change various aspects of heart development without direct manipulation of the cardiova...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/0022-2828(90)91035-6
更新日期:1990-09-01 00:00:00
abstract::We recently showed that angiotensin (ANG) II as well as mechanical stretch stimulated production of tumor necrosis factor (TNF) in cardiac fibroblasts. Presently, we examined the molecular mechanisms by which ANGII and lipopolysaccharide (LPS) upregulate TNF-alpha gene expression. In neonatal rat cardiac fibroblasts, ...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/s0022-2828(03)00210-4
更新日期:2003-10-01 00:00:00
abstract::Sphingomyelin breakdown product ceramide has recently been found to induce an adaptive response and reduce myocardial ischemia/reperfusion injury. Since activation of MAP kinases plays an essential role in myocardial adaptation to ischemic stress and since ceramide is involved in lipid raft formation where MAP kinases...
journal_title:Journal of molecular and cellular cardiology
pub_type: 杂志文章
doi:10.1016/j.yjmcc.2006.08.118
更新日期:2007-01-01 00:00:00
abstract::Somatic mutations and dysregulation by microRNAs (miRNAs) may have a pivotal role in the Congenital Heart Defects (CHDs). The purpose of the study was to assess both somatic and germline mutations in the GATA4 and NKX2.5 genes as well as to identify 3'UTR single nucleotide polymorphisms (SNPs) in the miRNA target site...
journal_title:Journal of molecular and cellular cardiology
pub_type: 临床试验,杂志文章
doi:10.1016/j.yjmcc.2013.04.002
更新日期:2013-07-01 00:00:00