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- W2137862893 abstract "In patients with chronic heart failure (CHF) concentration of TNF-alpha is elevated. Enhanced synthesis of TNF-alpha was also found in the hypothalamus of rats shortly after induction of the myocardial infarct. Available evidence indicates that TNF-alpha increases sympathetic activity and enhances function of the renin-angiotensin-aldosterone system in peripheral tissues. The role of TNF-alpha in regulation of the cardiovascular system and its interactions with brain angiotensin II (ANGII) in CHF was evaluated in the following study. Fourteen Sprague-Dawley rats underwent left coronary artery ligation, implantation of lateral cerebral ventricle cannula and insertion of femoral artery catheter. Post-infarct CHF was confirmed by increased left ventricle end-diastolic pressure. Mean arterial blood pressure (MABP) and heart rate (HR) were recorded during 60 min of intracerebroventricular (i.c.v.) infusion of 0.9% NaCl (5 microl/hr) (control group, n = 7) or TNF-alpha (100 ng/5 microl/hr) (experimental group, n = 7). This was followed by i.c.v. injection of subpressor dose of ANGII (5 ng/2 microl/30 sec) and measurements were continued for 20 min. Infusion of TNF-alpha resulted in the increase of MABP without changes in HR. Administration of ANGII elicited significantly greater increase of MABP in rats pretreated with TNF-alpha. Present results indicate that TNF-alpha increases MABP in CHF and sensitizes to pressor effect of centrally administered ANGII." @default.
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- W2137862893 date "2008-12-01" @default.
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- W2137862893 title "Central TNF-alpha elevates blood pressure and sensitizes to central pressor action of angiotensin II in the infarcted rats." @default.
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