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Signalling pathways in cardiac failure

R J Summers1, L R McMartin, A Kompa

  • 1Department of Pharmacology, University of Melbourne, Parkville, Victoria, Australia.

Clinical and Experimental Pharmacology & Physiology
|November 1, 1995
PubMed
Summary
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Heart failure causes catecholamine desensitization by altering beta-adrenoceptors (beta-AR). Beta-AR kinase (beta-ARK) increases, impacting signaling pathways crucial for cardiac function.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Pharmacology

Background:

  • Cardiac failure is linked to catecholamine pathway desensitization.
  • Beta-adrenoceptors (beta-AR) are present in human and animal hearts.
  • Beta-AR desensitization involves phosphorylation and uncoupling.

Purpose of the Study:

  • To investigate the changes in beta-adrenoceptors (beta-AR) and associated signaling pathways during cardiac failure.
  • To compare alterations in beta-AR subtypes and signaling molecules between human heart failure and animal models.

Main Methods:

  • Analysis of beta-adrenoceptor (beta-AR) expression and desensitization in human and animal heart failure models.
  • Measurement of beta-AR kinase (beta-ARK) and beta-arrestin activity and mRNA levels.

Related Experiment Videos

  • Assessment of G-protein alpha subunit changes (Gi alpha and Gs alpha).

    • Main Results:

    • Human heart failure shows loss of beta 1-AR or both beta 1- and beta 2-AR, unlike animal models with beta 2-AR loss.
    • Beta-adrenoceptor kinase (beta-ARK) activity and mRNA are significantly increased in heart failure.
    • Increased Gi alpha and unchanged Gs alpha levels are observed in heart failure.

    Conclusions:

    • Cardiac failure involves significant beta-adrenoceptor (beta-AR) desensitization and altered signaling.
    • Beta-adrenoceptor kinase (beta-ARK) plays a key role in the pathophysiology of heart failure.
    • Further research is needed to clarify the roles of G-protein subunits and other signaling molecules.