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Endothelial function in hypertension

P Mattei1, A Virdis, L Ghiadoni

  • 1Cattedra di Medicina Interna, Clinica Medica I, University of Pisa, Italy.

Journal of Nephrology
|July 1, 1997
PubMed
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Essential hypertension is linked to endothelial dysfunction, affecting nitric oxide (NO) pathways in blood vessels. This study suggests impaired kidney function in hypertensive patients, potentially due to superoxide anions impacting NO production.

Area of Science:

  • Cardiovascular Physiology
  • Renal Physiology
  • Endothelial Function

Background:

  • Endothelial dysfunction is observed in essential hypertension affecting forearm and coronary circulation.
  • Impaired nitric oxide (NO) release and altered agonist-induced vasodilation are key features.
  • The L-arginine-NO pathway and cyclooxygenase-dependent factors contribute to endothelial dysfunction.

Purpose of the Study:

  • To investigate the role of the L-arginine-NO pathway in human kidney function in essential hypertension.
  • To assess the impact of aging on endothelium-dependent vasodilation in the kidney.
  • To explore the mechanisms behind blunted renal response to L-arginine in hypertensive individuals.

Main Methods:

  • Analysis of data from kidney donors regarding intrarenal infusion of acetylcholine.

Related Experiment Videos

  • Systemic infusion of L-arginine in normotensive and hypertensive subjects.
  • Assessment of renal vasodilation, natriuresis, and intrarenal NO production.

    • Main Results:

    • Aging impairs endothelium-dependent vasodilation in the kidney, similar to other circulations.
    • L-arginine infusion induced renal vasodilation and natriuresis in normotensive individuals, mediated by NO.
    • Hypertensive patients showed blunted renal vasodilation and NO production in response to L-arginine, possibly due to superoxide anions.

    Conclusions:

    • Endothelial dysfunction is present in the kidney of essential hypertensive patients.
    • Superoxide anions may be a common mechanism underlying renal endothelial dysfunction in hypertension.
    • Findings highlight the importance of the L-arginine-NO pathway in renal regulation and its impairment in hypertension.