scholarly journals Nonproportional changes in plasma renin concentration, renal renin content, and rat renin messenger RNA.

Hypertension ◽  
1985 ◽  
Vol 7 (6_pt_1) ◽  
pp. 855-859 ◽  
Author(s):  
N Nakamura ◽  
F Soubrier ◽  
J Menard ◽  
J J Panthier ◽  
F Rougeon ◽  
...  
Keyword(s):  
Messenger Rna ◽  
Plasma Renin ◽  
Plasma Renin Concentration ◽  
Renin Content

Effects of aging on human plasma renin: simultaneous multiple assays of enzyme activity and immunoactivity of plasma renin

1989 ◽  
Vol 120 (1) ◽  
pp. 81-86 ◽  
Author(s):  
Jitsuo Higaki ◽  
Ryuichi Morishita ◽  
Toshio Ogihara ◽  
Masaru Nishiura
Keyword(s):  
Plasma Renin Activity ◽  
Plasma Renin ◽  
Normal Subjects ◽  
The Elderly ◽  
Renin Activity ◽  
Elderly Subjects ◽  
Plasma Renin Concentration ◽  
Active Renin ◽  
Effects Of Aging ◽  
Renin Content

Abstract. The effects of aging on plasma renin in normotensive volunteers were evaluated by conventional indirect RIA of angiotensin I and a newly developed direct RIA. Plasma renin activity and the plasma concentration of active renin measured by radiometric assay with monoclonal antibody were significantly lower in 14 subjects over 60 years than in 15 subjects under 60 years (plasma renin activity: 0.5 ± 0.1 vs 1.7 ± 0.4 nmol · 1−1 · h−1, P< 0.01; plasma active renin: 0.50 ± 0.05 vs 0.87 ± 0.13 pmol/l, P< 0.01, means ± sem), wheres neither the total renin activity nor the total plasma renin concentration measured by the newly developed immunometric assay were different in the two groups. In another study, the plasma renin concentration, total renin concentration and immunoreactive total renin concentration measured by direct RIA with polyclonal antibody were determined in 17 young (<60 years) and 12 elderly (≧60 years) subjects. Plasma renin concentration was significantly lower in the elderly subjects (1.7 ± 0.2 nmol · 1−1 · h−1) than in young subjects (3.4 ± 0.7 nmol · 1−1 · h−1, P< 0.05), but the total renin concentration and immunoreactive total renin concentrations in the two groups were not significantly different. These results indicate that the total renin content of the plasma does not change, whereas the active renin content decreases with age in normal subjects, and suggest that activation of prorenin to active renin may be impaired in elderly subjects.

The Estimation of Plasma Renin Concentration in the Dog

1964 ◽  
Vol 93 (1) ◽  
pp. 3C-4C ◽  
Author(s):  
J. J. Brown ◽  
D. L. Davies ◽  
A. F. Lever ◽  
J. I. S. Robertson ◽  
M. Tree
Keyword(s):  
Plasma Renin ◽  
Plasma Renin Concentration

EXTRAHEPATIC AND EXTRARENAL RENIN INACTIVATION IN THE DOG

1974 ◽  
Vol 60 (2) ◽  
pp. 217-222
Author(s):  
R. FAGARD ◽  
E. FOSSION ◽  
M. CAMPFORTS ◽  
A. AMERY
Keyword(s):  
Blood Vessels ◽  
Pulmonary Circulation ◽  
Plasma Renin ◽  
Glass Container ◽  
Plasma Renin Concentration ◽  
Vascular Beds ◽  
Extrarenal Renin

SUMMARY It was demonstrated previously that renin disappears quickly from the circulation after nephrectomy in the hepatectomized dog. In the present study the plasma renin concentration (PRC) was measured in the efferent and afferent blood vessels of several vascular beds (pulmonary circulation, splanchnic region, spleen, both inferior limbs and pelvis, head) in the anhepatic and in the anhepatic and anephric dog in order to investigate extrarenal and extrahepatic renin inactivation. However, no significant arteriovenous differences in PRC could be traced. The blood of these dogs kept in vitro at 37 °C in a glass container showed no decline in PRC within 3 h of removal. Therefore no specific extrahepatic and extrarenal renin-inactivating mechanism was found which could explain the rapid disappearance of renin from the blood in vivo in the anhepatic and anephric dog.

SERIAL ESTIMATION OF PLASMA RENIN CONCENTRATION DURING PREGNANCY AND AFTER PARTURITION

1966 ◽  
Vol 35 (4) ◽  
pp. 373-378 ◽  
Author(s):  
J. J. BROWN ◽  
D. L. DAVIES ◽  
P. B. DOAK ◽  
A. F. LEVER ◽  
J. I. S. ROBERTSON
Keyword(s):  
Pregnant Women ◽  
Plasma Renin ◽  
Plasma Renin Concentration ◽  
Before And After ◽  
Normal Women ◽  
Made In

SUMMARY Plasma renin concentration has been measured in normal women at intervals throughout pregnancy. Further measurements have been made in the days and hours before and after delivery of the foetus and placenta. Plasma renin was consistently raised in the majority of pregnant women and did not change markedly until 24 hr. or more after delivery. The significance of these findings is discussed.

scholarly journals Heightened Cardiovascular Risk in Hypertension Associated With Renin‐Independent Aldosteronism Versus Renin‐Dependent Aldosteronism: A Collaborative Study

2021 ◽  
Author(s):  
Jinbo Hu ◽  
Hang Shen ◽  
Peiqi Huo ◽  
Jun Yang ◽  
Peter J Fuller ◽  
...  
Keyword(s):  
Collaborative Study ◽  
Challenge Test ◽  
Plasma Renin ◽  
Excretion Ratio ◽  
Aldosterone Secretion ◽  
Cvd Risk ◽  
Baseline Serum ◽  
Plasma Renin Concentration ◽  
Serum Aldosterone ◽  
Urinary Potassium

Background While both renin‐dependent and renin‐independent aldosterone secretion contribute to aldosteronism, their relative associations with cardiovascular disease (CVD) risk has not been investigated. Methods and Results A total of 2909 participants from the FOS (Framingham Offspring Study) with baseline, serum aldosterone concentration, and plasma renin concentration who attended the sixth examination cycle and were followed up until 2014 and who were free of CVD were included. We further recruited 2612 hypertensive participants from the CONPASS (Chongqing Primary Aldosteronism Study). Captopril challenge test was performed to confirm renin‐dependent or ‐independent aldosteronism in CONPASS. Among 1433 hypertensive subjects of FOS, when compared with those with serum aldosterone concentration <10 ng dL −1 (normal aldosterone), participants who had serum aldosterone concentration ≥10 ng dL −1 and plasma renin concentration ≤15 mIU L −1 (identified as renin‐independent aldosteronism) showed a higher risk of CVD (hazard ratio, 1.40 [95% CI, 1.08–1.82]), while those who had serum aldosterone concentration ≥10 ng dL −1 and plasma renin concentration >15 mIU L −1 (identified as renin‐dependent aldosteronism) showed an unchanged CVD risk. In CONPASS, renin‐independent aldosteronism carried a significantly higher risk of CVD than normal aldosterone (odds ratio, 2.57 [95% CI, 1.13–5.86]), while the CVD risk remained unchanged in renin‐dependent aldosteronism. Elevation of the urinary potassium‐to‐sodium excretion ratio, reflective of mineralocorticoid receptor activity, was only observed in participants with renin‐independent aldosteronism. Conclusions Among patients with hypertension, renin‐independent aldosteronism is more closely associated with CVD risk than renin‐dependent aldosteronism.

Absence of Activation in Vitro of Renin in Rat Plasma

1982 ◽  
Vol 62 (4) ◽  
pp. 435-437 ◽  
Author(s):  
M. H. De Keijzer ◽  
A. P. Provoost ◽  
F. H. M. Derkx
Keyword(s):  
Human Plasma ◽  
Active Form ◽  
Plasma Renin ◽  
Rat Plasma ◽  
Plasma Renin Concentration ◽  
Inactive Form ◽  
Inactive Renin

1. Rat plasma was subjected at 4°C to various treatments known to convert inactive renin into its active form in human plasma. 2. No statistical differences in plasma renin concentration were found when the levels after the various treatments were compared with that of untreated rat plasma. 3. It is concluded that, in contrast to human plasma, no inactive form of renin is present in rat plasma.

What Stimulates the Renin—Angiotensin System in Rats with two-Kidney Renal Hypertension?

1983 ◽  
Vol 64 (5) ◽  
pp. 463-470
Author(s):  
Y. Takata ◽  
A. E. Doyle ◽  
M. Veroni ◽  
S. G. Duffy
Keyword(s):  
Blood Pressure ◽  
Plasma Renin Activity ◽  
Renin Angiotensin System ◽  
Plasma Renin ◽  
Renin Activity ◽  
Angiotensin System ◽  
Renin Angiotensin ◽  
Contralateral Kidney ◽  
The One ◽  
Renin Content

1. Blood pressure, the hypotensive effect of captopril, plasma renin activity, renal renin content and kidney weight were measured in the two-kidney—one-clip model, the one-kidney—one-clip model and the two-kidney—one-clip model with the ureter of the contralateral kidney ligated in rats. The ureteric ligation was performed to abolish urinary excretion from the contralateral kidney in the two-kidney—one-clip model. 2. The development of hypertension after renal artery constriction was earlier and greater in the one-kidney—one-clip model and the two-kidney—one-clip model with ureter of the contralateral kidney ligated than in the two-kidney—one-clip model. A single oral dose of captopril produced a greater fall in blood pressure in both the two-kidney models than in the one-kidney—one-clip group. 3. Plasma renin activity and renal renin content of the clipped kidney were higher in the two-kidney model rats, whether or not the ureter had been ligated, than in the one-kidney—one-clip model animals, although more than half the rats from the two-kidney model had normal values. There was a significant correlation between plasma renin activity and the response to captopril in all groups, whereas in none of the three groups was the correlation between plasma renin activity and blood pressure significant. 4. The clipped kidney had a higher renin content than did the contralateral kidney, and the weight of the ischaemic kidney was decreased compared with the contralateral kidney whether it was untouched or had its ureter ligated. The weight of the clipped kidney was in the order one-kidney—one-clip model > two-kidney—one-clip model with ureter of the contralateral kidney ligated > two-kidney—one-clip model. 5. It was concluded that the renin-angiotensin system was stimulated to the similar degree in some animals for the two-kidney—one-clip models, whether or not the ureter of the contralateral kidney had been ligated, compared with the one-kidney—one-clip animals. This finding suggests that the contralateral kidney can stimulate renin secretion and synthesis in the clipped kidney independently of Na+ excretion.

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