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Catecholamines and cardiac growth

M P Gupta1, M Gupta, S Jakovcic

  • 1Department of Medicine (Section of Cardiology), University of Chicago, IL 60637, USA.

Molecular and Cellular Biochemistry
|October 1, 1996
PubMed
Summary
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Cyclic adenosine monophosphate (cAMP) regulates cardiac gene expression by activating the alpha-myosin heavy chain (alpha-MHC) gene. A specific DNA element, the EM element, mediates this cAMP-induced gene expression in heart cells.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Gene Regulation

Background:

  • Alpha- and beta-adrenergic systems are crucial for cardiac growth and gene expression.
  • Cyclic adenosine monophosphate (cAMP) is a key intracellular messenger in regulating cardiac function.

Purpose of the Study:

  • To investigate the mechanism by which cAMP regulates cardiac gene expression.
  • To identify the specific DNA elements and protein factors involved in cAMP-mediated alpha-myosin heavy chain (alpha-MHC) gene regulation.

Main Methods:

  • Primary culture of fetal rat myocytes.
  • Transient transfection analysis using alpha-MHC gene promoter-CAT constructs.
  • Mobility shift assays to identify protein-DNA interactions.

Main Results:

Related Experiment Videos

  • A 13 bp E-box/M-CAT hybrid motif (EM element) was identified as conferring basal, muscle-specific, and cAMP-inducible expression of the alpha-MHC gene.
  • The transcription factor TEF-1 was found to bind to the EM element.
  • Proteins binding to the EM element are substrates for cAMP-dependent phosphorylation by protein kinase A (PK-A).

Conclusions:

  • The EM element is a critical regulatory region for cAMP-mediated alpha-MHC gene expression in cardiac myocytes.
  • cAMP signaling pathway, involving PK-A and TEF-1, plays a significant role in regulating cardiac gene expression.