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Related Concept Videos

Hormonal Regulation01:33

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: Angiotensin II Receptor Blockers01:30

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...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

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...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Antihypertensive Drugs: Action of β1 Blockers01:17

Antihypertensive Drugs: Action of β1 Blockers

β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...

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Induction of Atherosclerotic Plaques Through Activation of Mineralocorticoid Receptors in Apolipoprotein E-deficient Mice
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Published on: September 26, 2018

Relations between large artery structure and function and aldosterone.

Michel E Safar1, Sandrine Millasseau, Azra Mahmud

  • 1Université Paris Descartes, Paris, France. michel.safar@htd.aphp.fr

Journal of Hypertension
|August 10, 2011
PubMed
Summary
This summary is machine-generated.

Aldosterone impacts vascular health, increasing arterial stiffness and organ damage, particularly in individuals with a specific aldosterone synthase gene (CC) genotype, aiding early hypertension detection.

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Area of Science:

  • Cardiovascular physiology
  • Endocrinology
  • Genetics

Background:

  • Aldosterone influences vascular structure and function via mineralocorticoid receptors.
  • In rats, aldosterone increases arterial stiffness, extracellular matrix, and inflammation, leading to organ damage.
  • Aldosterone's role in human vascular changes, especially arterial stiffness and wave reflections, is age-dependent.

Purpose of the Study:

  • To investigate the independent influence of aldosterone on the human vascular environment.
  • To examine the association between aldosterone, arterial stiffness, and wave reflections with age in humans.
  • To explore the role of aldosterone synthase gene polymorphism in these vascular changes.

Main Methods:

  • Analysis of vascular parameters in humans at rest.
  • Assessment of arterial stiffness and wave reflections.
  • Genotyping for aldosterone synthase gene polymorphism (CYP11B2).

Main Results:

  • Aldosterone independently affects the arterial wall's structure and function.
  • Arterial stiffness and wave reflections increase with age in humans, independent of mean arterial pressure.
  • This age-related increase is significantly associated with the CC genotype of the aldosterone synthase gene polymorphism.

Conclusions:

  • Aldosterone plays a crucial role in vascular modifications.
  • The CC genotype of the aldosterone synthase gene is linked to accelerated vascular aging.
  • Identifying individuals with this genotype may facilitate early hypertension detection.