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The renin-aldosterone system is an endocrine system which guides the renal absorption of water and electrolytes, thus managing blood pressure and osmoregulation. Activation of the system begins in the kidneys with a small cluster of cells adjacent to the afferent and efferent blood vessels of the renal corpuscle. As the nephrons are filtering blood, juxtaglomerular cells monitor blood pressure. If they detect a decrease in pressure, they release the hormone renin into the bloodstream.

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The renin-angiotensin-aldosterone system (RAAS) is an intricate physiological pathway involving numerous enzymes and hormones, including renin, angiotensin-converting enzyme (ACE), angiotensin I and II, and aldosterone. Imbalances within this system increase the production of angiotensin II and aldosterone. Increased angiotensin II levels promote vasoconstriction and blood pressure elevation. Concurrently, higher aldosterone levels stimulate sodium and water reabsorption in the kidneys,...

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Related Experiment Video

Updated: Mar 9, 2026

Culturing Primary Rat Inner Medullary Collecting Duct Cells

Culturing Primary Rat Inner Medullary Collecting Duct Cells

Published on: June 21, 2013

Do prorenin-synthesizing cells release active, 'open' prorenin?

Alexandre G Martini¹, Manne Krop, Langeza Saleh

¹Division of Pharmacology and Vascular Medicine, Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands.

Journal of Hypertension

|December 23, 2016

Summary

This summary is machine-generated.

This study investigated if cells release active prorenin. Researchers found no evidence of open, active prorenin release from synthesizing cells, suggesting it

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Single-channel Analysis and Calcium Imaging in the Podocytes of the Freshly Isolated Glomeruli

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Published on: June 27, 2015

Area of Science:

Biochemistry
Endocrinology
Molecular Biology

Background:

The precise function of prorenin, the inactive renin precursor, remains elusive.
Prorenin exists in closed (inactive) and open (active) conformations, with the closed form predominating under physiological conditions.
The proposed (pro)renin receptor's interaction with prorenin occurs at unrealistically high concentrations for in vivo relevance.

Purpose of the Study:

To determine if prorenin-synthesizing cells release prorenin in its open, active conformation.
To investigate the potential for prorenin activity at the site of its release.

Main Methods:

Human mast cells, HEK293 cells expressing human prorenin, and human decidua cells were utilized.
Cells were incubated with the renin inhibitor VTP-27999, which traps open prorenin for detection.
Detection of open prorenin was performed using a renin immunoradiometric assay.
Decidua cells were incubated with angiotensinogen to assess angiotensin generation.

Main Results:

No evidence was found for the release of open, active prorenin from any of the tested cell types.
Angiotensin generation by decidua cells was minimal, consistent with the expected equilibrium of open prorenin (≈1%).

Conclusions:

Prorenin-synthesizing cells do not appear to release prorenin in an open, active conformation under cell culture conditions.
This finding challenges the hypothesis of prorenin having intrinsic activity at its release site.