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Related Experiment Videos

Polyamines decrease Ca(2+) sensitivity of tension and increase rates of activation in skinned cardiac myocytes.

S P Harris1, J R Patel, L J Marton

  • 1Department of Physiology, University of Wisconsin Medical School, Madison, Wisconsin 53706, USA. spharris@facstaff.wisc.edu

American Journal of Physiology. Heart and Circulatory Physiology
|September 20, 2000
PubMed
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Polyamines like spermine affect cardiac myofilament proteins, reducing calcium sensitivity and speeding up contraction. These findings offer new insights into cardiac muscle function and polyamine interactions.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Biochemistry

Background:

  • Polyamines (spermine, spermidine, putrescine) modulate cardiac myocyte membrane excitability and calcium (Ca2+) homeostasis.
  • Their direct effects on cardiac myofilament proteins remain largely unexplored.

Purpose of the Study:

  • To investigate the impact of polyamines on cardiac myofilament contractility.
  • To determine how polyamines influence calcium sensitivity and tension development in cardiac muscle.

Main Methods:

  • Utilized permeabilized rat cardiac myocytes and trabeculae.
  • Assessed isometric tension and calcium (Ca2+) activation curves.
  • Employed flash photolysis of caged calcium (DM-Nitrophen) to study tension development kinetics.

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Main Results:

  • Spermine, spermidine, and putrescine increased the Ca2+ concentration required for half-maximal tension, indicating reduced apparent Ca2+ binding affinity.
  • The order of efficacy was spermine > spermidine > putrescine.
  • Spermine accelerated tension development at submaximal Ca2+ concentrations, suggesting faster cross-bridge cycling.

Conclusions:

  • Polyamines, particularly spermine, interact with cardiac myofilament proteins.
  • These interactions decrease apparent Ca2+ binding affinity and enhance cross-bridge cycling kinetics at submaximal Ca2+ levels.
  • Polyamines are significant modulators of cardiac contractility beyond their known membrane effects.