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Related Experiment Videos

Mevalonate availability affects human and rat resistance vessel function

J B Roullet1, H Xue, C M Roullet

  • 1Department of Nephrology, Hypertension and Clinical Pharmacology, Oregon Health Sciences University, Portland 97201, USA.

The Journal of Clinical Investigation
|July 1, 1995
PubMed
Summary
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Mevalonate availability impacts vascular tone and blood pressure. Inhibiting its production with lovastatin impairs resistance artery function in rats and humans, increasing sensitivity to constrictors and reducing relaxation to vasodilators.

Area of Science:

  • Vascular biology
  • Biochemistry
  • Pharmacology

Background:

  • Cellular mevalonate is known to influence vascular tone and systemic blood pressure.
  • Understanding the precise role of mevalonate availability in regulating resistance artery function is crucial for cardiovascular health.

Purpose of the Study:

  • To investigate the impact of mevalonate availability on the function of resistance arteries in both experimental animals and humans.
  • To characterize the effects of inhibiting the mevalonate pathway on vascular reactivity and intracellular calcium levels.

Main Methods:

  • Rat mesenteric artery resistance vessels (MARV) were incubated with lovastatin (HMG-CoA reductase inhibitor) and/or mevalonate.
  • Vascular reactivity to various vasoactive agents (norepinephrine, serotonin, acetylcholine, etc.) was assessed.
Keywords:
Non-programmatic

Related Experiment Videos

  • Intravascular free calcium concentration (ivfCa2+) was measured using fura-2AM.
  • Human resistance arteries from adipose tissue were similarly studied.

    • Main Results:

    • Lovastatin treatment significantly increased sensitivity to norepinephrine and serotonin in rat MARV.
    • Lovastatin impaired the response to vasodilators (acetylcholine, atrial natriuretic peptide, SNP) in both rat and human vessels.
    • Inhibition of mevalonate synthesis elevated basal and norepinephrine-stimulated intracellular free calcium levels in rat MARV.
    • These detrimental effects of lovastatin were reversed by co-incubation with mevalonate.

    Conclusions:

    • Mevalonate availability is a direct contributor to resistance vessel function and vascular signal transduction in both rats and humans.
    • Disruptions in the mevalonate pathway can alter vascular tone and potentially lead to hypertension.
    • Further research is needed to identify non-sterol, mevalonate-derived vasoactive metabolites.