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Increasing evidence suggests that enhanced stimulation of the heart and kidney by mineralocorticoids plays significant role in development of the post-infarct cardiac failure. Because increased synthesis of mineralocorticoid receptors (MR) is one of the putative factors determining pathogenic effects of mineralocorticoids we decided to determine whether the myocardial infarct results in an enhanced...
The myocardial infarct causes prolonged activation of the renin-angiotensin system and profoundly influences cardiac performance and renal excretory capabilities. The aim of the present study was to determine whether the myocardial infarct is also associated with an altered expression of AT1a receptors (AT1aR) mRNA in the heart and the kidney. To this end male Sprague-Dawley rats were subjected either...
Growing number of studies reveal that the brain neural network plays significant role in the short-term and long-term regulation of the cardiovascular functions. The neurons involved in the complex neurogenic control of the cardiovascular system use classical neurotransmitters and nonconventional mediators such as peptides (angiotensin II, vasopressin, natriuretic peptides, endothelins, opioids, cytokines),...
The purpose of the study was to determine effect of high sodium intake on fluid and electrolyte turnover and heart remodeling in the cardiac failure elicited by myocardial infarction (MI). The experiments were performed on four groups of Sprague Dawley rats maintained on food containing 0.45% NaCl and drinking either water (groups 1, 2) or 1% NaCl (groups 3, 4). Groups 1 and 3 were sham-operated while...
Previous studies revealed that the brain angiotensinergic, vasopressinergic and nitrergic systems are involved in regulation of blood pressure and that their function is altered in various forms of hypertension. The purpose of our investigation was to determine whether expression of AT1a angiotensin receptors (AT1aR) mRNA, V1a vasopressin receptors (V1aR) mRNA and neuronal nitric oxide synthase (NOS1)...
Angiotensin-(1-7) (Ang-[1-7]) is present in the brain of normotensive Sprague Dawley (SD) rats, and its hypothalamic content is elevated in TGRmRen2(27) rats (TGR) with renin dependent transgenic hypertension. The purpose of the present study was to determine the role of intrabrain Ang-(1-7) in the regulation of cardiovascular functions in SD and TGR rats under resting conditions and during haemodynamic...
In short term experiments angiotensin II (Ang II) is a potent stimulant of thirst, however it is not known whether prolonged activation of the renin-angiotensin system is associated with chronic alteration of water or food intake. Renin transgenic rats TGRmRen(2)27 (TGR) exhibit significant elevation of AngII in the brain regions involved in regulation of body fluid balance. The purpose of the present...
Spontaneuosly hypertensive rats (SHR) have been shown to exhibit several alterations in function of the intrabrain vasopressinergic system. The present study was designed to find out whether centrally administered vasopressin (AVP) may influence the cardiovascular adaptation to hypotensive hypovolemia in SHR rats. Two series of experiments were performed on conscious 17 SHR rats chronically implanted...
Vasopressin plays significant role in regulation of blood pressure by means of V1 and V2 receptors, however regulation of synthesis of these receptors in hypertension is only poorly recognized. The puropose of the present study was to compare expression of V1a, V1b and V2 vasopressin (R) mRNA in the renal cortex, renal medulla and the heart of hypertensive renin transgenic TGR(mRen2)27 rats (TGR)...
The aim of the study was to find out whether vasopressin (AVP) modifies hypotensive and heart rate accelerating effects of atrial natriuretic peptide (ANP) in normotensive (WKY) and spontaneously hypertensive (SHR) conscious rats. The effect of i. v. administration of 1; 2 and 4 µg of ANP on blood pressure (MP) and heart rate (HR) was compared during i. v. infusion of 0.9% NaCl (NaCl), NaCl + AVP...
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