Abstract:
:To determine whether coronary vasodilator reserve that persists during myocardial ischemia is present in all left ventricular regions, we measured regional blood flow in 192 left ventricular pieces (mean weight, 201 mg) in each of eight dogs by using radioactive microspheres while perfusing the left main coronary artery at 70, 50, 40, and 30 mm Hg. Flows were measured before and during adenosine infusion to determine flow reserve. Perfusion at 40 and 30 mm Hg produced ischemia in all dogs. At 70 mm Hg, 100% of left ventricular regions had significant flow reserve, compared with 92%, 55%, and 8% during perfusion at 50, 40, and 30 mm Hg, respectively. A greater amount of flow reserve and a greater number of regions responded to adenosine in the subepicardium than in the subendocardium at 50, 40, and 30 mm Hg. We conclude that coronary flow reserve persists in only a subset of left ventricular regions during ischemia and that the number of regions with persistent flow reserve decreases with perfusion pressure. These findings may best be explained by a model in which regional ischemia is a maximal coronary vasodilator and persistent pharmacological vasodilator reserve seen when global markers indicate ischemia simply reflects persistent endogenous flow reserve in myocardial regions not yet ischemic.
journal_name
Circ Resjournal_title
Circulation researchauthors
Coggins DL,Flynn AE,Austin RE Jr,Aldea GS,Muehrcke D,Goto M,Hoffman JIdoi
10.1161/01.res.67.2.253subject
Has Abstractpub_date
1990-08-01 00:00:00pages
253-64issue
2eissn
0009-7330issn
1524-4571journal_volume
67pub_type
杂志文章abstract::The consequences of endothelin receptor activation were examined in atrial tumor myocytes derived from transgenic mice (AT-1 cells). Endothelin-1 (endothelin) stimulates phosphoinositide hydrolysis in a dose-dependent manner. Endothelin also induces the rapid and transient translocation of protein kinase C (PKC)-epsil...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.78.4.724
更新日期:1996-04-01 00:00:00
abstract:RATIONALE:Thousands of mutations across >50 genes have been implicated in inherited cardiomyopathies. However, options for sequencing this rapidly evolving gene set are limited because many sequencing services and off-the-shelf kits suffer from slow turnaround, inefficient capture of genomic DNA, and high cost. Further...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.115.306723
更新日期:2015-09-11 00:00:00
abstract::The mitochondrial enzyme monoamine oxidase (MAO), its isoform MAO-A, plays a major role in reactive oxygen species-dependent cardiomyocyte apoptosis and postischemic cardiac damage. In the current study, we investigated whether sphingolipid metabolism can account for mediating MAO-A- and reactive oxygen species-depend...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000253900.66640.34
更新日期:2007-01-05 00:00:00
abstract::A selective history of the pathophysiological, structural, and metabolic changes found during an episode of severe myocardial ischemia in the canine heart is presented. The changes that cause ischemic injury to become irreversible are discussed in detail because these changes are the target of any successful therapy d...
journal_title:Circulation research
pub_type: 历史文章,杂志文章,评审
doi:10.1161/CIRCRESAHA.113.300987
更新日期:2013-08-02 00:00:00
abstract::Trimetazidine is a clinically effective antianginal agent that has no negative inotropic or vasodilator properties. Although it is thought to have direct cytoprotective actions on the myocardium, the mechanism(s) by which this occurs is as yet undefined. In this study, we determined what effects trimetazidine has on b...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.86.5.580
更新日期:2000-03-17 00:00:00
abstract::Insulin-like growth factor I (IGF-I) is a widely distributed mitogen that mediates the growth-promoting effects of platelet-derived growth factor in mesenchymal cells. We show that rat aortic IGF-I messenger RNA (mRNA) is induced 24 hours after deendothelialization, at a time when smooth muscle cell proliferation with...
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
abstract::The release of acetylcholine from autonomic nerves in those tissues that receive a cholinergic innervation is widely believed to dilate blood vessels. Exogenously administered acetylcholine in vivo does dilate vascular beds and produce hypotension; however, this latter effect is indirect and probably the result of lib...
journal_title:Circulation research
pub_type: 杂志文章,评审
doi:10.1161/01.res.65.2.237
更新日期:1989-08-01 00:00:00
abstract::We studied a Syrian family with 3 children who had low-density lipoprotein cholesterol (LDL) concentrations of 13.3, 12.2, and 8.6 mmol/L, respectively. Three other siblings and the parents all had LDL values <4.52 mmol/L, suggesting an autosomal-recessive mode of inheritance. The extended pedigree had 66 additional p...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.0000018002.43041.08
更新日期:2002-05-17 00:00:00
abstract::Although enhanced growth of the vascular myocyte is believed to play a role in hypertensive cardiovascular disease, the cellular basis of altered growth regulation is not completely understood. The present study demonstrates that in the presence of 10% fetal calf serum, the logarithmic growth rate of cultured mesenter...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.69.3.757
更新日期:1991-09-01 00:00:00
abstract::Pinocytotic vesicles are one of several anatomic factors relevant to the permeability for macromolecules of capillary endothelia. We quantitified the number and distribution of pinocytotic vesicles present in the endothelium of pulmonary capillaries. Several similar studies have been reported in the past for endotheli...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.47.3.384
更新日期:1980-09-01 00:00:00
abstract:RATIONALE:T-type (CaV3.1/CaV3.2) Ca(2+) channels are expressed in rat cerebral arterial smooth muscle. Although present, their functional significance remains uncertain with findings pointing to a variety of roles. OBJECTIVE:This study tested whether CaV3.2 channels mediate a negative feedback response by triggering C...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.114.304056
更新日期:2014-09-12 00:00:00
abstract::In urethane-anesthetized rats, electrophysiological recordings of spontaneously active neurons in the vasopressor area of the rostral ventrolateral medulla were analyzed for participation in cardiovascular regulation. A total of 138 units were found which were inhibited by transient increases in mean arterial pressure...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.56.3.359
更新日期:1985-03-01 00:00:00
abstract::Angiotensin II (Ang II) plays an important role in post-myocardial infarction (MI) remodeling. Most Ang II effects related to remodeling involve activation of the type 1 receptor (AT(1)). Although the AT(1) receptor is upregulated on cardiac fibroblasts post-MI, little is known about the mechanisms involved in the pro...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.85.3.272
更新日期:1999-08-06 00:00:00
abstract::We examined the mechanism(s) of hypotensive action of platelet-activating factor (PAF) in anesthetized dogs. PAF (0.5 micrograms/kg i.v.) caused a biphasic hypotension; the first phase was transient and was accompanied by a decrease in systemic vascular resistance and an increase in cardiac output. Aspirin-DL-lysine, ...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.70.5.893
更新日期:1992-05-01 00:00:00
abstract::Calcium channel blockers (CCBs), which are used clinically for treatment of angina and hypertension, are known to inhibit calcium influx into arterial smooth muscle cells and thereby decrease smooth muscle cell contraction. In addition, they prevent cholesteryl ester (CE) accumulation, the hallmark of human atheroscle...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.66.1.185
更新日期:1990-01-01 00:00:00
abstract::The predominant cardiac Ca2+/calmodulin-dependent protein kinase (CaMK) is CaMKIIdelta. Here we acutely overexpress CaMKIIdeltaC using adenovirus-mediated gene transfer in adult rabbit ventricular myocytes. This circumvents confounding adaptive effects in CaMKIIdeltaC transgenic mice. CaMKIIdeltaC protein expression a...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000200739.90811.9f
更新日期:2006-02-03 00:00:00
abstract::Experimental and clinical studies have suggested an increased production of reactive oxygen species (ROS) in the failing myocardium. The present study aimed to obtain direct evidence for increased ROS and to determine the contribution of superoxide anion (*O(2)(-)), H(2)O(2), and hydroxy radical (*OH) in failing myoca...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.86.2.152
更新日期:2000-02-04 00:00:00
abstract:RATIONALE:Significant progress has revealed transcriptional inputs that underlie regulation of artery and vein endothelial cell fates. However, little is known concerning genome-wide regulation of this process. Therefore, such studies are warranted to address this gap. OBJECTIVE:To identify and characterize artery- an...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.119.316075
更新日期:2020-03-27 00:00:00
abstract::As early as the 4th embryonic day, the ventricle of the chick embryo responded to isoproterenol (Iso) with an increase in the force of contraction; at all ages studied, this positive inotropic effect was accompanied by an increased rate of tension development. There was a transient, 10-fold decrease in the sensitivity...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.48.2.245
更新日期:1981-02-01 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:RATIONALE:Endothelial colony forming cells (ECFCs) or late blood outgrowth endothelial cells can be isolated from human cord or peripheral blood, display properties of endothelial progenitors, home into ischemic tissues and support neovascularization in ischemic disease models. OBJECTIVE:To assess the functions of CYT...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.118.313645
更新日期:2019-01-18 00:00:00
abstract::Glibenclamide, one of the antidiabetic sulfonylureas, is known to block ATP-dependent K+ channels. We used this drug to determine to what extent K+ loss from acutely ischemic myocardium is mediated via these channels. We also investigated whether glibenclamide would influence ischemic arrhythmias. Isolated rat hearts ...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.66.2.478
更新日期:1990-02-01 00:00:00
abstract:RATIONALE:Remote ischemic preconditioning (rIPC) with short episodes of ischemia/reperfusion (I/R) of an organ remote from the heart is a powerful approach to protect against myocardial I/R injury. The signal transduction pathways for the cross talk between the remote site and the heart remain unclear in detail. OBJEC...
journal_title:Circulation research
pub_type: 临床试验,杂志文章
doi:10.1161/CIRCRESAHA.114.303822
更新日期:2014-05-09 00:00:00
abstract::Endocardial endothelium and endothelium of coronary vessels produce NO. Histochemical methods have suggested that coronary arterial endothelial cells contain more endothelial constitutive NO synthase (ecNOS) than does coronary venous endothelium. We have further investigated the distribution of ecNOS in cardiac endoth...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.res.82.2.195
更新日期:1998-02-09 00:00:00
abstract::We tested the hypothesis that TNF-alpha induces early-onset endothelial adhesivity toward PMN by activating the constitutive endothelial cell surface ICAM-1, the beta2-integrin (CD11/CD18) counter-receptor. Stimulation of human pulmonary artery endothelial cells with TNF-alpha resulted in phosphorylation of ICAM-1 wit...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000072971.88704.CB
更新日期:2003-05-30 00:00:00
abstract::Mitochondria are an important source of reactive oxygen species (ROS), implicated in ischemia/reperfusion injury. When isolated from ischemic myocardium, mitochondria demonstrate increased ROS production as a result of damage to electron transport complexes. To investigate the mechanisms, we studied effects of hypoxia...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.108.180869
更新日期:2008-10-10 00:00:00
abstract::Confocal imaging was used to study the influence of cytosolic ATP on the properties of spontaneous Ca(2+) sparks in permeabilized ventricular myocytes. Cells were perfused with mock intracellular solutions containing fluo 3. Reducing [ATP] to <0.5 mmol/L decreased the frequency but increased the amplitude of spontaneo...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/hh1801.096264
更新日期:2001-09-14 00:00:00
abstract::In myocardial infarction (MI), granulation tissue cells disappear via apoptosis to complete a final scarring with scanty cells. Blockade of this apoptosis was reported to improve post-MI ventricular remodeling and heart failure. However, the molecular biological mechanisms for the apoptosis are unknown. Fas and Fas li...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000141528.54850.bd
更新日期:2004-09-17 00:00:00
abstract::MicroRNAs (miRNAs) are a recently discovered class of endogenous, small, noncoding RNAs that regulate about 30% of the encoding genes of the human genome. However, the role of miRNAs in vascular disease is currently completely unknown. Using microarray analysis, we demonstrated for the first time that miRNAs are aberr...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/CIRCRESAHA.106.141986
更新日期:2007-06-08 00:00:00
abstract::The aim of this study was to determine whether prolonged loss of NO activity, in endothelial NO synthase knockout (eNOS(-/-)) mice, influences endothelin (ET) ETA receptor-mediated smooth muscle contraction and, if so, to define the underlying mechanism(s). In isolated endothelium-denuded abdominal aortas, contraction...
journal_title:Circulation research
pub_type: 杂志文章
doi:10.1161/01.RES.0000224120.52792.10
更新日期:2006-06-09 00:00:00