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Related Experiment Videos

Endothelial dysfunction and hypertensive vasoconstriction.

A A De Artinano1, V L Gonzalez

  • 1Departamento de Farmacologia, Facultad de Medicina, Universidad Complutense de Madrid, Ciudad Universitaria s/n., Madrid, 28040, Spain.

Pharmacological Research
|August 6, 1999
PubMed
Summary

Essential hypertension involves endothelial dysfunction and increased free radicals, impacting nitric oxide and leading to vasoconstriction. Antioxidants and specific antihypertensives may help by reducing free radical production.

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Highlights on endothelins: a review.

Pharmacological researchยท1998
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Area of Science:

  • Cardiovascular Physiology
  • Endothelial Function
  • Hypertension Pathophysiology

Background:

  • Endothelial dysfunction is common in essential hypertension, affecting nitric oxide synthesis and function.
  • Hypertensive vasoconstriction is linked to free radical degradation of nitric oxide, particularly superoxide anions.
  • Xanthine oxidase activity contributes to free radical formation, while superoxide dismutase normally neutralizes them.

Purpose of the Study:

  • To explore the role of endothelial dysfunction and free radicals in arterial hypertension.
  • To investigate the contribution of xanthine oxidase, superoxide dismutase, and cyclo-oxygenase pathways.
  • To examine the involvement of endothelin-1 in hypertensive vasoconstriction.

Main Methods:

  • Review of existing literature on endothelial function in hypertension.

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  • Analysis of the biochemical pathways involving free radicals (superoxide anion) and enzymes (xanthine oxidase, superoxide dismutase).
  • Examination of vasoconstrictor mechanisms including cyclo-oxygenase products and endothelin-1.

    • Main Results:

    • Increased free radical production or decreased superoxide dismutase activity is observed in hypertension.
    • Dysfunctional endothelium releases vasoconstrictor peroxides via cyclo-oxygenase activity, amplified by free radicals.
    • Endothelin-1, a potent vasoconstrictor, may increase locally and potentiate other vasoconstrictors, potentially releasing free radicals.

    Conclusions:

    • Increased vasoconstriction in arterial hypertension is associated with heightened free radical production.
    • Antioxidant agents and xanthine oxidase inhibitors are potential treatments for hypertension and endothelial dysfunction.
    • Some antihypertensive drugs may exert benefits by inhibiting free radical production.