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Related Experiment Videos

Glucocorticoids and vascular reactivity.

Shumei Yang1, Lubo Zhang

  • 1Department of Chemistry, California State University San Bernardino, San Bernardino, California 92407, USA. syang@csusb.edu

Current Vascular Pharmacology
|August 24, 2004
PubMed
Summary

Glucocorticoids enhance vascular reactivity and arterial contractile sensitivity. Regulation by 11 beta-hydroxysteroid dehydrogenase (11beta-HSD) in vascular cells is crucial for blood pressure control and may be implicated in hypertension.

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Area of Science:

  • Endocrinology
  • Vascular Biology
  • Cardiovascular Physiology

Background:

  • Corticosteroid hormones, particularly cortisol, influence vascular smooth muscle tone.
  • Glucocorticoids potentiate vasoactive responses to catecholamines via glucocorticoid receptors.
  • Increased cortisol levels correlate with heightened arterial sensitivity to norepinephrine and elevated vascular resistance.

Purpose of the Study:

  • To review mechanisms of glucocorticoid-mediated potentiation of vascular reactivity.
  • To explore the regulatory role of 11 beta-hydroxysteroid dehydrogenase (11beta-HSD) in this process.
  • To discuss the physiological and pathophysiological significance of glucocorticoids and 11beta-HSD in vascular function and hypertension.

Main Methods:

  • Review of existing literature on glucocorticoid effects on vascular cells.

Related Experiment Videos

  • Analysis of the role of glucocorticoid receptors in endothelial and smooth muscle cells.
  • Examination of the function of 11beta-HSD isozymes in modulating corticosteroid activity.

    • Main Results:

    • Glucocorticoids act on both endothelial and vascular smooth muscle cells to regulate vascular reactivity.
    • In endothelial cells, glucocorticoids suppress vasodilators like prostacyclin and nitric oxide.
    • In smooth muscle cells, glucocorticoids enhance agonist-mediated pharmacomechanical coupling.
    • 11beta-HSD isozymes (Type 1 and Type 2) are present in vascular cells and modulate local corticosteroid levels.

    Conclusions:

    • Glucocorticoid hormones significantly impact vascular tone and reactivity.
    • 11beta-HSD plays a critical role in regulating glucocorticoid access to receptors within the vasculature.
    • Dysregulation of 11beta-HSD in vascular cells may contribute to the pathogenesis of hypertension.