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Related Concept Videos

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

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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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Antihypertensive Drugs: Direct Renin Inhibitors01:25

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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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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...
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Hormonal Regulation01:33

Hormonal Regulation

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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 activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
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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,...
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Related Experiment Video

Updated: Sep 13, 2025

Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
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The Renin-Angiotensin System Modulates SARS-CoV-2 Entry via ACE2 Receptor.

Sophia Gagliardi1, Tristan Hotchkin1, Hasset Tibebe1

  • 1Department of Biology, College of Arts & Sciences, American University, Washington, DC 20016, USA.

Viruses
|July 30, 2025
PubMed
Summary
This summary is machine-generated.

Angiotensin IV uniquely affects severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) entry into cells, enhancing it at low concentrations and inhibiting it at high concentrations. This discovery offers new insights into Coronavirus Disease 2019 (COVID-19) and potential treatments.

Keywords:
angiotensinangiotensin-converting enzyme 2renin–angiotensin systemsevere acute respiratory syndrome coronavirus 2spike proteinviral-like particle

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Area of Science:

  • Cardiovascular Regulation
  • Virology
  • Molecular Biology

Background:

  • The renin-angiotensin system (RAS) is crucial for cardiovascular homeostasis.
  • Angiotensin-converting enzyme 2 (ACE2) is the entry receptor for SARS-CoV-2, the virus causing COVID-19.
  • Angiotensin IV, but not angiotensin II, may influence SARS-CoV-2 spike protein binding to ACE2.

Purpose of the Study:

  • To investigate the virological significance of angiotensin IV's effect on SARS-CoV-2 entry.
  • To determine the impact of different angiotensin concentrations on viral infectivity.

Main Methods:

  • Development of a single-round infection assay using SARS-CoV-2 viral-like particles.
  • Testing viral infectivity across a range of angiotensin II and IV concentrations (40 nM to 400 nM).
  • In silico molecular docking simulations to predict angiotensin IV binding sites on the viral spike protein.

Main Results:

  • Angiotensin II did not significantly affect viral infectivity.
  • Angiotensin IV demonstrated a dual role: enhancing viral entry at low concentrations and inhibiting it at higher concentrations.
  • Molecular docking suggested angiotensin IV associates with the spike protein's S1 domain near the receptor-binding domain.

Conclusions:

  • Angiotensin IV has a unique, concentration-dependent effect on SARS-CoV-2 entry.
  • Physiological concentrations of angiotensin IV might promote SARS-CoV-2 infection.
  • Findings provide novel insights into COVID-19 pathophysiology and potential therapeutic targets involving the RAS.