During intravenous administration of varying doses of angiotensin II antibody to anesthetized rats, apparently specific vascular receptors were characterized. These receptors compete with administered antibody to bind circulating angiotensin. This competitive phenomenon was used to evaluate the affinity of these receptors for angiotensin. Apparent vascular receptor affinity was defined by the a...

Angiotensinogen - a serpin family protein predominantly produced by the liver is systematically processed by proteases of the Renin Angiotensin system (RAS) generating hormone peptides. Specific cell surface receptors for at least three distinct angiotensin peptides produce distinct cellular signals that regulate system-wide physiological response to RAS. Two well characterized receptors are an...

This review article looks at the emerging concepts about the renin angiotensin system. The specific aspects it covers include angiotensin II receptors, angiotensin receptor antagonists and alternative enzymatic pathways for the conversion of angiotensin I to angiotensin II other than angiotensin converting enzyme. The review, additionally, looks at the current and future clinical applications o...

The major biological actions of the renin–angiotensin system are mediated by angiotensin (Ang) II, which binds with equal affinity to Ang type 1 (AT1) and type 2 (AT2) receptors. The majority of Ang II actions, however, are mediated by the AT1 receptor, including vasoconstriction, cellular proliferation, tissue growth, direct renal tubular sodium reabsorption, sympathetic nervous stimulation, a...

The pancreas is a relative newcomer to the stable of tissues with an intrinsic angiotensin-generating system. The involvement of this system in pancreatic activity will be dependent on the angiotensin-generating paths present in the pancreas and their precise cellular location. Thus far, renin, angiotensin-converting enzyme (ACE), angiotensin II and AT1 and AT2 receptors have been found. These ...

Experiments were performed in vivo on chronically cannulated adult rainbow trout (Oncorhynchus mykiss) to assess the involvement of serotonergic or muscarinic receptor stimulation or activation of the renin-angiotensin system in eliciting catecholamine release during acute hypoxia during periods of nicotinic receptor desensitisation. Despite nicotinic receptor desensitisation induced by intrave...

Introduction: The aim of this study was to investigate the effect of angiotensin II (Ang II) and losartan injections into paraventricular nucleus (PVN) on renal ischemia-reperfusion injury. Methods: After right nephrectomy in male rats, a cannula was inserted into the right PVN. One week later, renal ischemia-reperfusion (IR) injury was induced by clamping the left renal artery for 45 min, a...

Activation of the renin-angiotensin system by sodium deficiency is associated with reciprocal changes in the expression of angiotensin II receptors in adrenal glomerulosa and vascular smooth muscle cells. The effects of dietary sodium changes on the expression of brain angiotensin receptor subtype 1 (AT1) mRNAs were examined in rats maintained on normal, low, and high sodium intake for 3 weeks....

The classically recognized functions of the renin-angiotensin system are mediated by type 1 (AT1) angiotensin receptors. Whereas man possesses a single AT1 receptor, there are two AT1 receptor isoforms in rodents (AT1A and AT1B) that are products of separate genes (Agtr1a and Agtr1b). We have generated mice lacking AT1B (Agtr1b -/-) and both AT1A and AT1B receptors (Agtr1a -/-Agtr1b -/-). Agtr1...

Vascular injury and remodeling are common pathological sequelae of hypertension. Previous studies have suggested that the renin-angiotensin system acting through the type 1 angiotensin II (AT(1)) receptor promotes vascular pathology in hypertension. To study the role of AT(1) receptors in this process, we generated mice with cell-specific deletion of AT(1) receptors in vascular smooth muscle ce...