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Related Experiment Videos

G-protein function is reduced in hypertension

R D Feldman1, J Chorazyczewski

  • 1Department of Medicine, University of Western Ontario, Canada. ross.feldman@lhsc.on.ca

Hypertension (Dallas, Tex. : 1979)
|January 1, 1997
PubMed
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Hypertension may involve impaired G-protein/adenylyl cyclase coupling in lymphocytes, affecting beta-adrenergic responses. This study found reduced coupling in hypertensive individuals, suggesting a link to elevated blood pressure.

Area of Science:

  • Cardiovascular Physiology
  • Molecular Pharmacology
  • Cellular Signaling

Background:

  • Hypertension is associated with impaired vasodilator tone and reduced beta-adrenergic responsiveness.
  • Previous research suggests a defect in G-protein function underlies this impairment in hypertensive individuals.
  • The specific impact on G-protein/adenylyl cyclase coupling requires further investigation.

Purpose of the Study:

  • To investigate the G-protein/adenylyl cyclase coupling in lymphocytes of hypertensive subjects.
  • To determine if impaired coupling contributes to the reduced beta-adrenergic-stimulated adenylyl cyclase activity observed in hypertension.
  • To compare coupling efficiency across hypertensive, older normotensive, and younger normotensive control groups.

Main Methods:

Related Experiment Videos

  • Lymphocytes were isolated from three groups: hypertensive subjects, older normotensive subjects, and younger normotensive controls.
  • [3H]forskolin binding assays were performed to assess adenylyl cyclase activity and G-protein coupling.
  • Stimulated binding assays used Gpp(NH)p, NaF/AlCl3, and isoproterenol to probe different aspects of G-protein/adenylyl cyclase interaction.

    • Main Results:

    • Maximal [3H]forskolin binding (adenylyl cyclase sites) did not differ significantly among the groups.
    • Gpp(NH)p- and isoproterenol-stimulated [3H]forskolin binding were significantly reduced in lymphocytes from hypertensive subjects.
    • NaF/AlCl3-stimulated binding showed no significant differences between groups, indicating the defect lies in coupling, not catalytic activity.
    • Reduced stimulated binding inversely correlated with blood pressure levels across all subjects.

    Conclusions:

    • G-protein/adenylyl cyclase coupling is impaired in lymphocytes of hypertensive individuals.
    • This impairment may underlie the reduced beta-adrenoceptor-stimulated adenylyl cyclase activity seen in hypertension.
    • The findings suggest a potential molecular mechanism contributing to elevated peripheral vascular resistance in hypertension.