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Related Experiment Videos

Altered catecholamine receptor affinity in rabbit aortic intimal hyperplasia.

M K O'Malley1, S Cotecchia, P O Hagen

  • 1Department of Surgery, Duke University Medical Center, Durham, North Carolina 27710.

The Journal of Surgical Research
|August 1, 1991
PubMed
Summary

Arterial intimal hyperplasia shows increased alpha-1 adrenergic receptor affinity for norepinephrine. This receptor-mediated supersensitivity is linked to the phosphatidylinositol cycle, impacting vascular smooth muscle cells.

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Area of Science:

  • Vascular Biology
  • Pharmacology
  • Cardiovascular Research

Background:

  • Intimal thickening is a common response to endothelial injury and a precursor to atherosclerosis.
  • Arterial intimal hyperplasia exhibits selective supersensitivity to norepinephrine.

Purpose of the Study:

  • To investigate the mechanism behind norepinephrine supersensitivity in rabbit aortic intimal hyperplasia.
  • To determine the role of alpha-1 adrenergic receptors and the phosphatidylinositol cycle.

Main Methods:

  • Binding studies using the alpha-1 adrenergic radioligand 125I-HEAT in rabbit aorta.
  • Competition studies to assess receptor affinity changes.
  • Measurement of phosphatidylinositol and phosphatidic acid levels following norepinephrine stimulation.

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Main Results:

  • No change in alpha-1 adrenergic receptor density was observed in intimal hyperplastic tissue.
  • A 2.6-fold increase in alpha-1 adrenergic receptor affinity for norepinephrine was found.
  • Norepinephrine stimulation led to greater increases in phosphatidylinositol and phosphatidic acid in hyperplastic tissue.

Conclusions:

  • Catecholamine supersensitivity in rabbit aortic intimal hyperplasia is receptor-mediated.
  • The observed supersensitivity may be linked to the phosphatidylinositol cycle.