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The urea cycle describes how liver cells convert ammonia to urea. Ammonia is a toxic waste product of protein catabolism. Land animals must convert ammonia into the less toxic urea which can be safely eliminated by the kidneys through urine. Marine animals excrete ammonia directly, and the surrounding water dilutes the ammonia to safe levels.
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Assessment of Vascular Function in Patients With Chronic Kidney Disease
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The urea decomposition product cyanate promotes endothelial dysfunction.

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High cyanate levels in chronic kidney disease patients impair endothelial function, contributing to cardiovascular disease. This study reveals cyanate damages blood vessels, increasing cardiovascular risk.

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Area of Science:

  • Cardiovascular Science
  • Nephrology
  • Biochemistry

Background:

  • Cardiovascular disease is a leading cause of mortality in chronic kidney disease (CKD) patients.
  • Endothelial dysfunction significantly contributes to this increased cardiovascular risk.
  • Cyanate, a urea byproduct elevated in CKD, is implicated in cardiovascular disease pathogenesis, but mechanisms are unclear.

Purpose of the Study:

  • To investigate the mechanisms by which cyanate contributes to endothelial dysfunction and cardiovascular disease in CKD.
  • To examine the association of cyanate with endothelial cells in human atherosclerotic lesions.
  • To evaluate the in vitro and in vivo effects of cyanate on endothelial function.

Main Methods:

  • Immunohistochemical analysis of human atherosclerotic lesions to detect carbamylated epitopes.
  • In vitro treatment of human coronary artery endothelial cells with cyanate.
  • In vivo administration of cyanate to mice to induce protein carbamylation.
  • Assessment of arterial vasorelaxation in mouse aortic rings.
  • Measurement of endothelial nitric oxide synthase (eNOS), nitric oxide (NO) production, tissue factor (TF), and plasminogen activator inhibitor-1 (PAI-1) levels.

Main Results:

  • Carbamylated epitopes were predominantly found on endothelial cells in human atherosclerotic lesions.
  • Cyanate treatment reduced eNOS expression and increased TF and PAI-1 in human endothelial cells.
  • Cyanate administration in mice reduced acetylcholine-induced vasorelaxation of aortic rings.
  • Protein carbamylation levels in cyanate-treated mice mimicked those in uremic patients.
  • Reduced eNOS and NO production, alongside increased TF and PAI-1, were observed in aortas of cyanate-treated mice.

Conclusions:

  • Cyanate directly compromises endothelial cell function both in vitro and in vivo.
  • Protein carbamylation by cyanate contributes to endothelial dysfunction.
  • These findings suggest cyanate plays a significant role in the elevated cardiovascular risk observed in chronic kidney disease patients.