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Related Experiment Videos

Beta-adrenoceptor density in chronic infarcted myocardium: a subtype specific decrease of beta1-adrenoceptor density.

R L Anthonio1, O E Brodde, D J van Veldhuisen

  • 1Department of Clinical Pharmacology, University of Groningen, The Netherlands.

International Journal of Cardiology
|January 26, 2000
PubMed
Summary
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In chronic myocardial infarction, total beta-adrenoceptor density decreases significantly. This reduction is specifically due to a decrease in beta1-adrenoceptor density, not beta2-adrenoceptor density.

Area of Science:

  • Cardiovascular Physiology
  • Molecular Cardiology
  • Pharmacology

Background:

  • Beta-adrenoceptor density is known to change in various cardiac conditions, being downregulated in heart failure and upregulated in acute ischemia.
  • In the acute phase post-myocardial infarction, total beta-adrenoceptor density is reduced.

Purpose of the Study:

  • To determine if total beta-adrenoceptor number is altered in the chronic phase following myocardial infarction.
  • To investigate the specificity of these alterations, examining both beta1- and beta2-adrenoceptor subtypes.

Main Methods:

  • Male Wistar rats underwent coronary artery ligation or a sham operation.
  • Twelve weeks post-operation, hearts were analyzed for total beta-adrenoceptor number and the relative densities of beta1- and beta2-adrenoceptors in infarcted and non-infarcted myocardium.

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Main Results:

  • Total beta-adrenoceptor number was significantly decreased in infarcted myocardium compared to sham and non-infarcted myocardium.
  • This decrease was attributed to a significant reduction in beta1-adrenoceptor density.
  • Beta2-adrenoceptor density and dissociation constant remained unchanged.

Conclusions:

  • In the chronic phase after myocardial infarction, total beta-adrenoceptor density is reduced in the infarcted myocardium.
  • The observed decrease in total beta-adrenoceptor density is primarily due to a significant downregulation of beta1-adrenoceptor density.