The role of 11[beta]-hydroxysteroid dehydrogenase type 2 in the central regulation of blood pressure and salt appetite

2015 ◽  
Author(s):  
Julie McNairn ◽  
Matthew Bailey ◽  
Carmel Moran ◽  
Lorraine Work ◽  
Megan Holmes
Keyword(s):  
Blood Pressure ◽  
Hydroxysteroid Dehydrogenase ◽  
Salt Appetite ◽  
Central Regulation ◽  
Regulation Of Blood Pressure

Role of AT2 receptor in the brain in regulation of blood pressure and water intake

2003 ◽  
Vol 284 (1) ◽  
pp. H116-H121 ◽  
Author(s):  
Zhen Li ◽  
Masaru Iwai ◽  
Lan Wu ◽  
Tetsuya Shiuchi ◽  
Toyohisa Jinno ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Water Intake ◽  
Pressor Response ◽  
Receptor Blocker ◽  
Dependent Manner ◽  
Ang Ii ◽  
Dose Dependent ◽  
Regulation Of Blood Pressure

The effects of intracerebroventricular (ICV) injection of angiotensin II (ANG II) on blood pressure and water intake were examined with the use of ANG II receptor-deficient mice. ICV injection of ANG II increased systolic blood pressure in a dose-dependent manner in wild-type (WT) mice and ANG type 2 AT2 receptor null (knockout) (AT2KO) mice; however, this increase was significantly greater in AT2KO mice than in WT mice. The pressor response to a central injection of ANG II in WT mice was inhibited by ICV preinjection of the selective AT1 receptor blocker valsartan but exaggerated by the AT2 receptor blocker PD-123319. ICV injection of ANG II also increased water intake. It was partly but significantly suppressed both in AT2KO and AT1aKO mice. Water intake in AT2/AT1aKO mice did not respond to ICV injection of ANG II. Both valsartan and PD-123319 partly inhibited water intake in WT mice. These results indicate an antagonistic action between central AT1a and AT2 receptors in the regulation of blood pressure, but they act synergistically in the regulation of water intake induced by ANG II.

Role of the At 2 Receptor in the Cardioprotective Effect of At 1 Antagonist in Mice with Chronic Heart Failure Induced by Coronary Ligation

Hypertension ◽  
2000 ◽  
Vol 36 (suppl_1) ◽  
pp. 704-704
Author(s):  
Jiang Xu ◽  
Oscar A Carretero ◽  
Yun-He Liu ◽  
Edward G Shesely ◽  
Fang Yang ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Cardiac Function ◽  
Cardioprotective Effect ◽  
Receptor Subtypes ◽  
Ang Ii ◽  
Coronary Ligation ◽  
Regulation Of Blood Pressure

P63 Angiotensin II (Ang II) acts mainly on two receptor subtypes: type 1 (AT 1 ) and type 2 (AT 2 ). Most of the known biological actions of Ang II are mediated via AT 1 receptors; however, the role of the AT 2 receptor is less well defined. We hypothesized that blockade of AT 1 receptors increases circulating Ang II levels, which in turn activates the AT 2 receptor and induces cardioprotection. In mice which lack AT 2 receptors, the effect of an AT 1 antagonist (AT 1 -ant) would be diminished or absent. AT 2 receptor knockout mice (-/-) and their wild-type littermates (+/+) were subjected to myocardial infarction (MI) by ligating the left anterior descending coronary artery. One month after MI, each strain of mice received either vehicle or AT 1 -ant (valsartan, 50 mg/kg/day in drinking water) for 3 months. Systolic blood pressure (SBP) was measured weekly and echocardiography performed once a month. Basal SBP and cardiac function did not differ between +/+ and -/-. Three months after MI, SBP and cardiac function changed similarly in both strains receiving vehicle. Valsartan significantly increased EF and decreased LVDd and mass and these effects were diminished in -/- (table). Our results suggest that under basal conditions, the AT 2 receptor may not play an important role in regulation of blood pressure and cardiac function; however, it does appear to be an important component in the cardioprotective effect of AT 1 -ant.

Anti-Hypertensive Potential and Epigenetics of Angiotensin II type 2 Receptor (AT2R)

2020 ◽  
Vol 16 ◽  
Author(s):  
Mayank Chaudhary
Keyword(s):  
Blood Pressure ◽  
Angiotensin Ii ◽  
Renin Angiotensin System ◽  
Blood Pressure Regulation ◽  
Biologically Active ◽  
Pressure Regulation ◽  
Tissue Remodelling ◽  
Critical Pathway

Background:: Renin angiotensin system (RAS) is a critical pathway involved in blood pressure regulation. Octapeptide, angiotensin II (Ang aII), is biologically active compound of RAS pathway which mediates its action by binding to either angiotensin II type 1 receptor (AT1R) or angiotensin II type 2 receptor (AT2R). Binding of Ang II to AT1R facilitates blood pressure regulation whereas AT2R is primarily involved in wound healing and tissue remodelling. Objective:: Recent studies have highlighted additional role of AT2R to counter balance detrimental effects of AT1R. Activation of angiotensin II type 2 receptor using AT2R agonist has shown effect on natriuresis and release of nitric oxide. Additionally, AT2R activation has been found to inhibit angiotensin converting enzyme (ACE) and enhance angiotensin receptor blocker (ARB) activity. These findings highlight the potential of AT2R as novel therapeutic target against hypertension. Conclusion:: The potential role of AT2R highlights the importance of exploring additional mechanisms that might be crucial for AT2R expression. Epigenetic mechanisms including DNA methylation and histone modification have been explored vastly with relation to cancer but role of such mechanisms on expression of AT2R has recently gained interest.

scholarly journals An Obesity-RelatedFTOVariant and the Risk of Preeclampsia in a Finnish Study Population

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Miira Klemetti ◽  
Leena M. Hiltunen ◽  
Sanna Heino ◽  
Seppo Heinonen ◽  
Eero Kajantie ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Type 2 Diabetes ◽  
Early Onset ◽  
Elevated Blood ◽  
Study Population ◽  
Normotensive Pregnancy ◽  
Finnish Study ◽  
Risk Of Preeclampsia

Previous studies have demonstrated a common variant of the obesity and fat mass-relatedFTOgene, rs9939609, to be associated with obesity, type 2 diabetes, and elevated blood pressure. We investigated whether theFTOSNP rs9939609 is associated with the risk of preeclampsia (PE) in a Finnish study population. 485 women with prior PE and 449 women who had given birth after a normotensive pregnancy were genotyped (TaqMan) for the SNP rs9939609. The prevalences of genotypes AA, AT, and TT were 15%, 53%, and 32%, respectively, among the PE cases, and 16%, 47%, and 37%, respectively, among the controls (P=0.199). We found no evidence of an association between theFTOSNP rs9939609 and PE. However, our cases were dominated by severe, early-onset PE. Thus, we are unable to exclude an association with the milder, later-onset form of the disease in which the role of maternal metabolic predisposition could be more significant.Erratum to “An Obesity-RelatedFTOVariant and the Risk of Preeclampsia in a Finnish Study Population”

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