Vincenzo Panagia

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Heart dysfunction in chronic diabetes has been observed to be associated with depressed myofibrillar adenosine triphosphatase activities as well as abnormalities in the sarcoplasmic reticular and sarcolemmal calcium transport processes. The evidence has been presented to show that alterations in the expression of myosin isozymes and regulatory proteins as(More)
It is widely recognized that calcium is of singular importance in the viability of the myocardial cell, nonetheless little is known concerning the precise nature of the action of calcium in myocardium as to how it maintains the life of the cell and how it may dictate the death of the cell. However, recent advances in research involved with the study of(More)
Although phosphatidic acid (PA) is mainly formed due to the hydrolysis of phosphatidylcholine by myocardial phospholipase D, its functional significance in the heart is not fully understood. The present study was designed to determine the effects of PA on intracellular free Ca2+ level ([Ca2+]i) in freshly isolated adult rat cardiomyocytes by using fura(More)
In order to examine the mechanisms of ischemia-reperfusion induced changes in beta-adrenoceptor-linked signal transduction pathway, isolated rat hearts perfused in the absence or presence of superoxide dismutase (SOD) plus catalase (CAT) were made ischemic for 30 min and then reperfused for 60 min. The left ventricular developed pressure as well as the rare(More)
Incubation of purified cardiac sarcolemmal vesicles (SL) in the presence of S-adenosyl-L-methionine, a methyl donor for the enzymatic N-methylation of phosphatidylethanolamine (PE), increased the Ca2+-stimulated ATPase and ATP-dependent Ca2+ accumulation activities. Quantitative analysis of the methylated phospholipids revealed that maximal increase of(More)
The effect of phosphatidylethanolamine N-methylation on Na+-Ca2+ exchange was studied in sarcolemmal vesicles isolated from rat heart. Phosphatidylethanolamine N-methylation following incubation of membranes with S-adenosyl-L-methionine, a methyl donor for the enzymatic N-methylation, inhibited Nai+-dependent Ca2+ uptake by about 50%. The N-methylation(More)
The transmethylation of phosphatidylethanolamine (PE) to phosphatidylcholine (PC) was studied in rat heart sarcolemmal membrane. Kinetically, three apparent Km values for S-adenosyl-L-methionine (AdoMet) were obtained when the total [3H]methyl groups incorporation into the phospholipids was examined in the presence of 0.01-250 microM AdoMet. A first(More)
Fibroblast growth factor-2 (FGF-2), administered to the isolated rat heart by perfusion and under constant pressure, is protective against ischemia-reperfusion (I-R). Here we have investigated whether FGF-2 cardioprotection: (a) is dependent on flow modulation; (b) is linked to effects on contractility; (c) is mediated by protein kinase C (PKC); and (d) is(More)
Previous reports have demonstrated that lysophosphatidylcholine (LPC) increases the intracellular concentration of calcium ([Ca++]i) in the heart; however, the mechanisms responsible for this increase are not clear. We examined the effect of exogenous LPC on [Ca++]i in freshly isolated cardiomyocytes from adult rats. Our results showed that LPC elevated the(More)
We have examined the changes in quantity and activity of cardiac sarcolemmal (SL) phosphoinositide-phospholipase C (PLC)-beta(1), -gamma(1), and -delta(1) in a model of congestive heart failure (CHF) secondary to large transmural myocardial infarction (MI). We also instituted a late in vivo monotherapy with imidapril, an ANG-converting enzyme (ACE)(More)