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Related Experiment Videos

Endothelial dysfunction is induced by proinflammatory oxidant hypochlorous acid.

C Zhang1, R Patel, J P Eiserich

  • 1Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|September 15, 2001
PubMed
Summary

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Hypochlorous acid (HOCl), an inflammatory oxidant, impairs blood vessel function by reducing nitric oxide (NO) availability. This endothelial dysfunction is linked to alterations in L-arginine metabolism.

Area of Science:

  • Biochemistry
  • Physiology
  • Vascular Biology

Background:

  • Myeloperoxidase (MPO)-derived hypochlorous acid (HOCl) is implicated in inflammatory tissue injury.
  • Nitric oxide (NO) is a critical regulator of vascular function and tone.

Purpose of the Study:

  • To investigate the effect of HOCl on nitric oxide (NO) bioavailability in rat aortic rings.
  • To determine the mechanism by which HOCl affects endothelial function.

Main Methods:

  • Rat aortic ring segments were treated with varying concentrations of HOCl.
  • Endothelium-dependent relaxation was assessed using acetylcholine (ACh) and calcium ionophore A23187.
  • Endothelium-independent relaxation was measured with sodium nitroprusside.
  • Endothelial NO synthase (eNOS) activity and NO metabolite formation were analyzed in bovine aortic endothelial cells.

Related Experiment Videos

  • The role of L-arginine was investigated by assessing the reversal of HOCl's effects.

    • Main Results:

    • HOCl significantly impaired endothelium-dependent relaxation induced by ACh and A23187.
    • HOCl did not affect endothelium-independent relaxation to sodium nitroprusside.
    • The inhibitory effect of HOCl was reversed by L-arginine, but not D-arginine.
    • HOCl reduced NO metabolite (nitrate and nitrite) formation in endothelial cells.
    • HOCl did not alter eNOS protein or activity.

    Conclusions:

    • HOCl induces endothelial dysfunction by interfering with L-arginine, leading to decreased NO bioavailability.
    • This mechanism contributes to vascular injury during inflammation.