scholarly journals Targeting of the Renin-Angiotensin System as an Adjunct to Estrogen Replacement Therapy

Hypertension ◽  
2004 ◽  
Vol 44 (4) ◽  
pp. 390-391 ◽  
Author(s):  
Lisa M. Harrison-Bernard
Keyword(s):  
Replacement Therapy ◽  
Estrogen Replacement Therapy ◽  
Renin Angiotensin System ◽  
Estrogen Replacement ◽  
Angiotensin System ◽  
Renin Angiotensin

Effects of Estrogen Replacement Therapy on the Renin-Angiotensin System in Postmenopausal Women

Circulation ◽  
1997 ◽  
Vol 95 (1) ◽  
pp. 39-45 ◽  
Author(s):  
Heribert Schunkert ◽  
A.H. Jan Danser ◽  
Hans-Werner Hense ◽  
Frans H.M. Derkx ◽  
Susanne Ku¨rzinger ◽  
...  
Keyword(s):  
Replacement Therapy ◽  
Postmenopausal Women ◽  
Estrogen Replacement Therapy ◽  
Renin Angiotensin System ◽  
Estrogen Replacement ◽  
Angiotensin System ◽  
Renin Angiotensin

Downregulation of the renin-angiotensin system in streptozotocin-diabetic rats

1992 ◽  
Vol 262 (1) ◽  
pp. E105-E109 ◽  
Author(s):  
L. A. Cassis
Keyword(s):  
Adipose Tissue ◽  
Replacement Therapy ◽  
White Adipose Tissue ◽  
Plasma Concentrations ◽  
Renin Angiotensin System ◽  
Diabetic Rats ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
Brown Adipose ◽  
Insulin Replacement

To determine if insulin has the ability to regulate components of the renin-angiotensin system, renin and angiotensinogen mRNA and plasma concentrations were determined in 4-wk streptozotocin (STZ)-diabetic rats. In another group of STZ-diabetic rats, replacement insulin therapy was given over the 4-wk period, and the above parameters were examined. In STZ-diabetic rats, there was a significant regression of white adipose tissue that was accompanied by an increase in the yield of RNA obtained. Changes in white adipose tissue were reversed by insulin replacement therapy in STZ-diabetic rats. There were no changes in brown adipose tissue weight or RNA yield in STZ-diabetic rats. Plasma renin activity (PRA) was significantly decreased in STZ-diabetic rats; however, plasma angiotensinogen concentration was not significantly affected by diabetes. PRA was restored to control levels in STZ-diabetic rats with insulin replacement. Kidney renin mRNA as well as liver, epididymal, and interscapular fat angiotensinogen mRNA were significantly decreased in STZ-diabetic rats. Renin and angiotensinogen mRNA were not significantly different from control in all tissues examined in STZ-diabetic rats with insulin replacement therapy. Results from this study suggest a downregulation of the renin-angiotensin system in 4-wk STZ-diabetic rats at the level of mRNA expression that is restored by replacement therapy with insulin; therefore, insulin may directly or indirectly regulate the renin-angiotensin system.

scholarly journals Effects of estrogen replacement on stress-induced cardiovascular responses via renin-angiotensin system in ovariectomized rats

2016 ◽  
Vol 311 (5) ◽  
pp. R898-R905 ◽  
Author(s):  
Shoko Tazumi ◽  
Naoko Yokota ◽  
Mizuho Kawakami ◽  
Sayo Omoto ◽  
Akira Takamata ◽  
...  
Keyword(s):  
Angiotensin Ii ◽  
Psychological Stress ◽  
Pressor Response ◽  
Renin Angiotensin System ◽  
Cardiovascular Responses ◽  
Ovariectomized Rats ◽  
Separate Experiment ◽  
Estrogen Replacement ◽  
Angiotensin System ◽  
Renin Angiotensin

The purpose of this study was to determine whether chronic estrogen replacement in ovariectomized rats inhibits the pressor response to psychological stress by attenuating the activation of the renin-angiotensin system. Female Wistar rats aged 9 wk were ovariectomized. After 4 wk, the rats were randomly assigned to be implanted subcutaneously with pellets containing either 17β-estradiol (E2) or placebo (Pla). After 4 wk of treatment, the rats underwent cage-switch stress and, in a separate experiment, a subset received an infusion of angiotensin II. The cage-switch stress rapidly elevated blood pressure (BP) and heart rate (HR) as measured by radiotelemetry in both groups. However, the BP and HR responses to the stress were significantly attenuated in the E2 group compared with the Pla group. An angiotensin II type 1 receptor blocker, losartan, given in drinking water, abolished the difference in the pressor response to stress between the two groups. Moreover, the stress-induced elevation in plasma renin activity and angiotensin II concentration was significant in the Pla group, but not in the E2 group. In addition, the expression of renin mRNA in the kidney was lower in the E2 group relative to the Pla group. Finally, we found that intravenous angiotensin II infusion increased BP and decreased HR to a similar degree in both groups. These results suggest that the inhibitory effects of estrogen on psychological stress-induced activation of the renin-angiotensin system could be at least partially responsible for the suppression of the pressor responses to psychological stress seen in estrogen-replaced ovariectomized rats.

scholarly journals Renin–angiotensin system gene polymorphisms and endometrial cancer

2016 ◽  
Vol 5 (3) ◽  
pp. 128-135 ◽  
Author(s):  
Kirsty G Pringle ◽  
Sarah J Delforce ◽  
Yu Wang ◽  
Katie A Ashton ◽  
Anthony Proietto ◽  
...  
Keyword(s):  
Endometrial Cancer ◽  
Replacement Therapy ◽  
Hormone Replacement ◽  
Renin Angiotensin System ◽  
Nucleotide Polymorphisms ◽  
Obese Women ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
Gynaecological Malignancy

Endometrial cancer (EC) is the most common gynaecological malignancy and its incidence is increasing. Dysregulation of the endometrial renin–angiotensin system (RAS) could predispose to EC; therefore, we studied the prevalence of RAS single nucleotide polymorphisms (SNPs) in Australian women with EC. SNPs assessed were AGT M235T (rs699); AGTR1 A1166C (rs5186); ACE A240T and T93C (rs4291, rs4292) and ATP6AP2 (rs2968915). They were identified using TaqMan SNP Genotyping Assays. The C allele of the AGTR1 SNP (rs5186) was more prevalent in women with EC (odds ratio (OR) 1.7, 95% confidence interval (CI) (1.2–2.3), P=0.002). The CC genotype of this SNP is associated with upregulation of the angiotensin II type 1 receptor (AGTR1). The G allele of AGT rs699, which is associated with higher angiotensinogen (AGT) levels, was less prevalent in women with EC (OR 0.54, 95% CI (0.39–0.74), P<0.001) compared with controls. AGT and AGT formed by removal of angiotensin I (des(Ang I)AGT) are both anti-angiogenic. In women with EC who had had hormone replacement therapy (HRT), the prevalence of the AGTR1 SNP (rs5186) and the ACE SNPs (rs4291 and rs4292) was greater than in women who had no record of HRT; SNP rs4291 is associated with increased plasma ACE activity. These data suggest there is an interaction between genotype, oestrogen replacement therapy and EC. In conclusion, the prevalence of two SNPs that enhance RAS activity was different in women with EC compared with healthy controls. These genetic factors may interact with obesity and hyperoestrogenism, predisposing ageing, obese women to EC.

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