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[Hypertension, endothelial dysfunction and cardiovascular risk].

A Nitenberg1

  • 1Service de physiologie et d'explorations fonctionnelles, CHU Jean Verdier, Université Paris 13, avenue du 14 juillet, 93140 Bondy. alain.nitenberg@jvr.aphp.fr

Archives Des Maladies Du Coeur Et Des Vaisseaux
|November 15, 2006
PubMed
Summary
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Hypertension causes endothelial dysfunction by reducing nitric oxide (NO) availability, leading to oxidative stress and inflammation. This dysfunction is a key marker for future cardiovascular events like atherosclerosis.

Area of Science:

  • Cardiovascular Physiology
  • Endothelial Biology
  • Hypertension Research

Context:

  • Hypertension significantly impacts vascular endothelium function.
  • Endothelial dysfunction, marked by reduced endothelium-dependent vasodilation, is an early sign of hypertensive vascular changes.
  • Decreased nitric oxide (NO) availability is a primary factor in this vasodilation impairment.

Purpose:

  • To elucidate the mechanisms underlying endothelial dysfunction in hypertension.
  • To identify the role of nitric oxide (NO) deficiency and oxidative stress.
  • To explore the cascade leading to atherosclerosis and cardiovascular complications.

Summary:

  • Hypertension-induced endothelial dysfunction stems from reduced nitric oxide (NO) availability, caused by substrate deficits, inhibitors like asymmetrical dimethylarginine, or cofactor tetrahydrobiopterin (BH4) deficiency.

Related Experiment Videos

  • Increased oxidative stress, involving superoxide radicals and peroxynitrates, further impairs NO signaling and activates pathways promoting inflammation and LDL oxidation.
  • This process triggers a cascade involving NAD(P)H oxidases and protein kinase C, leading to the activation of nuclear factor-kappaB and subsequent expression of genes contributing to atherosclerosis and vascular remodeling.

    • Impact:

    • Identifies endothelial dysfunction as a critical, early indicator of hypertension-related vascular damage.
    • Highlights the central role of oxidative stress and nitric oxide (NO) deficiency in the pathogenesis of hypertensive cardiovascular disease.
    • Provides insights into the molecular mechanisms driving atherosclerosis and its complications, offering potential targets for therapeutic intervention.