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Hormonal Regulation

Hormonal Regulation

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.

Antihypertensive Drugs: Direct Renin Inhibitors

Antihypertensive Drugs: Direct Renin Inhibitors

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,...

Regulation of Sodium and Potassium

Regulation of Sodium and Potassium

The regulation of sodium and potassium ion concentrations in the human body is a complex process governed primarily by hormones such as aldosterone, antidiuretic hormone (ADH), and atrial natriuretic peptide (ANP).
Sodium Regulation
Sodium ions make up approximately 90% of extracellular cations, with a normal blood plasma concentration of 136–148 mEq/L. A decrease in blood volume and pressure triggers the release of renin from granular cells in the juxtaglomerular complex (JGC), primarily...

Antihypertensive Drugs: Angiotensin II Receptor Blockers

Antihypertensive Drugs: Angiotensin II Receptor Blockers

In the renin-angiotensin-aldosterone system, a hormone called angiotensin II plays a crucial role. It binds to the AT1 receptors in vascular smooth muscles coupled with Gq proteins. The activation of these receptors activates an enzyme called phospholipase C, which releases two molecules: inositol trisphosphate and diacylglycerol. These molecules cause a chain reaction that leads to the phosphorylation of myosin light chains and promotes interaction between actin and myosin, leading to smooth...

Antihypertensive Drugs: Potassium-Sparing Diuretics

Antihypertensive Drugs: Potassium-Sparing Diuretics

Liddle syndrome is a genetically inherited form of hypertension characterized by the overactivity of epithelial sodium channels in the nephron, the functional unit of the kidney. This heightened activity leads to increased sodium reabsorption and excessive excretion of potassium. To counteract this, potassium-sparing diuretics such as amiloride are used. They function by blocking these sodium channels, thereby reducing the influx of sodium into the epithelial cells and minimizing the loss of...

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...

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Related Experiment Video

Updated: Jul 2, 2025

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

Published on: November 30, 2013

MicroRNAs in aldosterone production and action.

Scott M MacKenzie¹, Lara A Birch¹, Stelios Lamprou¹

¹School of Cardiovascular and Metabolic Health, BHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, United Kingdom.

Vitamins and Hormones

|February 26, 2024

Summary

MicroRNAs influence aldosterone levels, impacting blood pressure regulation. Circulating microRNAs may serve as biomarkers for diagnosing primary aldosteronism, a common and treatable form of hypertension.

Keywords:

Adrenal cortex Aldosterone Hypertension MicroRNA Mineralocorticoid Primary aldosteronism

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Last Updated: Jul 2, 2025

MicroRNA In situ Hybridization for Formalin Fixed Kidney Tissues

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Published on: November 30, 2013

Phenotypic Characterization of Macrophages from Rat Kidney by Flow Cytometry

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Published on: September 26, 2018

Area of Science:

Endocrinology
Molecular Biology
Cardiovascular Research

Background:

Aldosterone regulates blood pressure and is secreted by the adrenal gland, influenced by the renin-angiotensin system and hypothalamic-pituitary-adrenal axis.
MicroRNAs are non-coding RNAs that regulate gene expression post-transcriptionally.
Aberrant microRNA levels are observed in conditions of aldosterone dysregulation.

Purpose of the Study:

To summarize current research on the role of microRNAs in aldosterone production and action.
To explore the potential of circulating microRNAs as diagnostic biomarkers for primary aldosteronism.

Main Methods:

Literature review of studies investigating microRNA involvement in aldosterone pathways.
Analysis of research on microRNA dysregulation in aldosterone-related conditions.
Discussion of diagnostic potential for circulating microRNAs in primary aldosteronism.

Main Results:

MicroRNAs have been identified to regulate genes involved in aldosterone synthesis and signaling.
Changes in microRNA expression correlate with aldosterone dysregulation.
Circulating microRNAs show promise as potential biomarkers for primary aldosteronism.

Conclusions:

MicroRNAs play a significant role in the complex regulation of aldosterone.
Circulating microRNAs represent a promising avenue for the early and accurate diagnosis of primary aldosteronism, a treatable condition.
Further research is warranted to validate microRNAs as reliable diagnostic biomarkers for hypertension management.