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Related Experiment Videos

Glucocorticoids modulate vascular reactivity in the rat.

J P Grünfeld1, L Eloy

  • 1Department of Nephrology, Institut National de la Santé et de la Recherche Medicale U-90, Necker Hospital, Paris, France.

Hypertension (Dallas, Tex. : 1979)
|December 1, 1987
PubMed
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Endogenous glucocorticoids regulate blood pressure by increasing vascular reactivity. Blocking these effects with RU 486 lowers blood pressure, especially in salt-restricted rats, revealing glucocorticoid influence on cardiovascular and renal systems.

Area of Science:

  • Endocrinology
  • Cardiovascular Physiology
  • Renal Physiology

Background:

  • Endogenous glucocorticoids play a role in blood pressure regulation.
  • Understanding their precise cardiovascular effects is crucial.

Purpose of the Study:

  • To investigate the cardiovascular effects of RU 486, an antiglucocorticoid, in Wistar rats.
  • To clarify the role of endogenous glucocorticoids in blood pressure regulation.

Main Methods:

  • Administered RU 486 to conscious and anesthetized Wistar rats.
  • Measured pressor responses to angiotensin II, norepinephrine, and vasopressin.
  • Assessed cardiac output, renal blood flow, and vascular resistance using the microsphere method.
  • Utilized a low sodium diet model to stimulate pressor systems.

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Main Results:

  • RU 486 (20 mg/kg/day) blunted pressor responses to angiotensin II and norepinephrine.
  • RU 486 reduced total peripheral vascular resistance and mean blood pressure in salt-restricted rats.
  • Antiglucocorticoid activity, not antimineralocorticoid activity, was responsible for the observed effects.
  • Endogenous glucocorticoids were shown to increase vascular reactivity and influence renal hemodynamics.

Conclusions:

  • Endogenous glucocorticoids contribute to blood pressure regulation by enhancing vascular reactivity.
  • Glucocorticoids play a role in controlling renal hemodynamics, particularly in salt-restricted conditions.
  • The antiglucocorticoid RU 486 unmasked the vascular actions of endogenous glucocorticoids.