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Related Concept Videos

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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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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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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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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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Related Experiment Video

Updated: May 11, 2025

A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis
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Angiotensinogen and C3 compete for renin-induced complement activation.

Ann-Charlotte Kristoffersson1, Albin Sköld1, Charlotte Welinder2

  • 1Department of Pediatrics, Clinical Sciences Lund, Lund University, Lund, Sweden.

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|April 17, 2025
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Renin cleaves complement protein C3, generating fragments C3a and C3b. This interaction, particularly in the kidney, may be significant when angiotensinogen is depleted.

Keywords:
C3angiotensinogencomplementkidneyrenin

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Area of Science:

  • Biochemistry
  • Immunology
  • Renal Physiology

Background:

  • Renin's ability to cleave complement protein C3 into C3a and C3b has been previously reported but also contested.
  • Concerns were raised regarding potential trypsin contamination in recombinant renin preparations, which could explain observed C3 cleavage.
  • Endogenous renin production by cells has also been linked to C3 deposition.

Purpose of the Study:

  • To definitively investigate the cleavage of C3 by recombinant renin, addressing prior controversies.
  • To examine the competitive inhibition of C3 cleavage by angiotensinogen, renin's primary substrate.
  • To confirm the absence of trypsin contamination in recombinant renin preparations.

Main Methods:

  • Mass spectrometry with endopeptidase LysC digestion to analyze recombinant renin for trypsin.
  • Immunoblotting to detect C3b formation following incubation with recombinant renin.
  • Enzyme-linked immunosorbent assay (ELISA) to quantify C3a generation and angiotensin I production.

Main Results:

  • Mass spectrometry confirmed the absence of trypsin in the recombinant renin used.
  • Recombinant renin demonstrated C3 cleavage to C3b, consistent across different protocols.
  • C3a generation was rapid (within 1 min) and inhibited by aliskiren, a specific renin inhibitor.
  • Angiotensinogen competed with C3 for renin, indicating it is a preferred substrate, while C3 did not inhibit angiotensinogen cleavage.

Conclusions:

  • Renin directly cleaves complement protein C3, independent of trypsin contamination.
  • Angiotensinogen is the preferred substrate for renin, but C3 cleavage can occur.
  • The renin-C3 interaction may be functionally relevant in the kidney, especially under conditions of substrate depletion.