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Assessment of Myofilament Ca2+ Sensitivity Underlying Cardiac Excitation-contraction Coupling
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Ca handling during excitation-contraction coupling in heart failure

Aleksey V Zima1, Elisa Bovo, Stefan R Mazurek

  • 1Department of Cell and Molecular Physiology, Loyola University Chicago, Stritch School of Medicine, 2160 South First Avenue, Maywood, IL, 60153, USA, AZIMA@lumc.edu.

Pflugers Archiv : European Journal of Physiology
|February 12, 2014
PubMed

Insights

Dysfunctional calcium (Ca) handling in heart failure involves altered ryanodine receptor (RyR) and SR Ca ATPase (SERCA) proteins. These changes disrupt excitation-contraction coupling, impacting heart function and rhythm.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Physiology

Background:

  • Excitation-contraction coupling in the heart relies on precise calcium (Ca) cycling.
  • The sarcoplasmic reticulum (SR) network and T-tubular system orchestrate Ca release and uptake.
  • Dysfunction of key Ca handling proteins, ryanodine receptor (RyR) and SR Ca ATPase (SERCA), is central to heart failure (HF).

Purpose of the Study:

  • To review structural modifications of RyR and SERCA in the failing heart.
  • To elucidate how these molecular changes impact SR Ca regulation.
  • To understand the effects on excitation-contraction coupling in heart failure.

Main Methods:

  • Literature review focusing on molecular and cellular mechanisms.
  • Analysis of structural changes in RyR and SERCA proteins.
  • Examination of Ca cycling abnormalities in heart failure models.

Main Results:

  • Heart failure is characterized by widespread Ca regulation abnormalities.
  • Altered RyR and SERCA function contribute to impaired Ca release, uptake, and diastolic leak.
  • These molecular changes directly affect cardiac contractility and arrhythmogenesis.

Conclusions:

  • Modifications in RyR and SERCA structure are critical in heart failure pathophysiology.
  • Understanding these molecular alterations is key to addressing abnormal Ca homeostasis.
  • Targeting RyR and SERCA may offer therapeutic strategies for heart failure.

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