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Related Experiment Video

Updated: Apr 13, 2026

Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes
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Assessing Ca²⁺-removal pathways in cardiac myocytes.

Virginie Bito1, Karin R Sipido1, Niall Macquaide1

  • 1Division of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Belgium.

Cold Spring Harbor Protocols
|May 3, 2015
PubMed
Summary

This study details methods to assess the Na(+)-Ca(2+) exchanger (NCX) function, crucial for cellular calcium ([Ca(2+)]i) regulation. Protocols are provided for both clamped and physiological conditions to accurately measure NCX activity.

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Area of Science:

  • Cardiovascular physiology
  • Cellular electrophysiology
  • Calcium signaling

Background:

  • Intracellular calcium ([Ca(2+)]i) transient decline during excitation-contraction coupling (ECC) involves SERCA, NCX, and other pumps.
  • Accurate assessment of individual Ca(2+) removal mechanisms is vital for understanding cardiac function.
  • Traditional methods often overestimate SERCA activity by not fully accounting for NCX function.

Purpose of the Study:

  • To present detailed protocols for assessing Na(+)-Ca(2+) exchanger (NCX) function.
  • To enable accurate quantification of NCX's role in cytosolic Ca(2+) removal.
  • To provide methods applicable under both controlled (clamped) and physiological (free ion) conditions.

Main Methods:

  • Development of protocols to assess NCX activity.
  • Implementation of conditions with clamped intracellular Na(+) and Ca(2+) concentrations.
  • Adaptation of protocols for conditions with freely changing Na(+) and Ca(2+) concentrations.

Main Results:

  • Established reliable methods for quantifying NCX function.
  • Demonstrated the feasibility of assessing NCX under clamped and physiological conditions.
  • Provided a framework for dissecting Ca(2+) handling in cardiac cells.

Conclusions:

  • Accurate assessment of NCX function is achievable with the presented protocols.
  • Understanding NCX activity is critical for comprehending calcium homeostasis and membrane potential.
  • These methods will aid research into cardiac electrophysiology and disease states involving calcium dysregulation.