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Related Concept Videos

Antihypertensive Drugs: Direct Renin Inhibitors01:25

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,...
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 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...
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...
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...

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Related Experiment Video

Updated: Jun 19, 2026

A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis
08:21

A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis

Published on: October 26, 2020

ON THE NATURE OF THE PRESSOR ACTION OF RENIN.

I H Page1

  • 1Lilly Laboratory for Clinical Research, Indianapolis City Hospital, Indianapolis.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Repeated renin injections cause tachyphylaxis in animals, a response linked to a loss of renin-activator. Restoring this activator can reverse the effect, highlighting its role in renin

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Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion
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Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion

Published on: May 26, 2022

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Last Updated: Jun 19, 2026

A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis
08:21

A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis

Published on: October 26, 2020

Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion
08:35

Improved Renal Denervation Mitigated Hypertension Induced by Angiotensin II Infusion

Published on: May 26, 2022

Area of Science:

  • Cardiovascular Physiology
  • Renal Physiology

Background:

  • Renin plays a crucial role in blood pressure regulation.
  • Tachyphylaxis, a rapid decrease in response to a drug, has been observed with repeated renin administration.

Purpose of the Study:

  • To investigate the mechanisms underlying renin-induced tachyphylaxis.
  • To identify factors influencing the pressor response to renin.

Main Methods:

  • Repeated intravenous injections of renin in various animal models (dogs, cats).
  • Surgical manipulations including hepatectomy, suprarenalectomy, nephrectomy, and evisceration.
  • Isolated rabbit ear perfusion studies with renin and renin-activator.
  • Analysis of blood samples for renin-activator content.

Main Results:

  • Tachyphylaxis to renin occurs consistently across different experimental conditions.
  • The pressor response to renin is largely independent of arterial pressure and adrenal glands but is reduced by evisceration and ergotamine.
  • Renin-activator is essential for renin's vasoconstrictive activity in isolated systems.
  • Blood from tachyphylactic animals lacks renin-activator, and its addition restores renin's efficacy.

Conclusions:

  • Renin-induced tachyphylaxis is mediated by the depletion of a blood factor, termed renin-activator.
  • The presence and activity of renin-activator are critical for maintaining the pressor response to renin.
  • Understanding renin-activator dynamics is key to managing renin-based therapies and understanding cardiovascular regulation.