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[Endothelial function and arterial hypertension]

S Taddei1, A Virdis, L Ghiadoni

  • 1Cattedra di Medicina Interna, Università degli Studi di Pisa.

Annali Italiani Di Medicina Interna : Organo Ufficiale Della Societa Italiana Di Medicina Interna
|October 1, 1995
PubMed
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Essential hypertension involves reduced nitric oxide (NO) production and blunted vasodilation. This endothelial dysfunction, linked to the L-arginine-NO pathway and constrictor prostanoids, is present early and may not be fully reversed by treatment.

Area of Science:

  • Cardiovascular Physiology
  • Endothelial Function
  • Hypertension Research

Background:

  • In healthy individuals, the endothelium regulates vascular tone primarily via nitric oxide (NO) production.
  • Human essential hypertension is characterized by reduced basal NO release and impaired vasodilation to endothelium-dependent agonists like acetylcholine and bradykinin.

Purpose of the Study:

  • To investigate the mechanisms underlying endothelial dysfunction in essential hypertension.
  • To determine whether impaired NO production or agonist-evoked vasodilation is a primary phenomenon in hypertension.
  • To explore the roles of the L-arginine-nitric oxide pathway and constrictor prostanoids in endothelial dysfunction.

Main Methods:

  • Assessment of basal nitric oxide release.
  • Measurement of forearm vasodilation in response to endothelium-dependent agonists (acetylcholine, bradykinin).

Related Experiment Videos

  • Evaluation of the L-arginine-nitric oxide pathway and constrictor prostanoid production.
  • Comparison of endothelial function in normotensive individuals, offspring of hypertensive patients, young essential hypertensives, and aging hypertensive patients.

    • Main Results:

    • Defective basal nitric oxide release appears secondary to elevated blood pressure.
    • Impaired agonist-evoked vasodilation is likely a primary endothelial dysfunction, stemming from alterations in the L-arginine-NO pathway and increased constrictor prostanoids.
    • Nitric oxide production defects are detectable early in normotensive offspring of hypertensive individuals and young essential hypertensives.
    • Constrictor prostanoid production is more closely associated with aging.

    Conclusions:

    • Endothelial dysfunction in essential hypertension involves both reduced nitric oxide availability and increased constrictor prostanoid activity.
    • The impairment in agonist-evoked vasodilation is a primary defect, evident even before the onset of sustained hypertension.
    • While pharmacological treatment may restore basal nitric oxide production, it does not fully reverse the vascular response deficits to endothelial agonists.