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Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes
11:00

Assessment of Sarcoplasmic Reticulum Calcium Reserve and Intracellular Diastolic Calcium Removal in Isolated Ventricular Cardiomyocytes

Published on: September 18, 2017

Cardiac Na+/Ca2+ exchange activity in patients with end-stage heart failure

H Reinecke1, R Studer, R Vetter

  • 1Universitatsklinik Freiburg, Kardiologie und Angiologie, Germany.

Cardiovascular Research
|January 1, 1996
PubMed

Insights

In failing human hearts, the sarcolemmal sodium-calcium exchanger (NCX) shows increased activity and expression. This elevated NCX function may impact calcium handling and heart rhythm in heart failure.

Area of Science:

  • Cardiology
  • Molecular Biology
  • Physiology

Background:

  • The sarcolemmal sodium-calcium exchanger (NCX) plays a crucial role in regulating intracellular calcium levels within cardiomyocytes.
  • Dysfunction of the NCX is implicated in the pathophysiology of heart failure.

Purpose of the Study:

  • To investigate the functional activity and protein expression of the sarcolemmal NCX in human end-stage heart failure.
  • To determine if changes in NCX are associated with the failing human heart.

Main Methods:

  • Left ventricular myocardial samples were obtained from patients with end-stage heart failure and normal controls.
  • NCX activity was measured via 45Ca2+ transport assays in sarcolemmal vesicles.
  • NCX protein abundance was quantified using Western blot analysis.

Main Results:

  • Both Na+ gradient-induced 45Ca2+ transport activity and NCX protein levels were significantly increased in failing hearts compared to controls (87% and 160% increase, respectively).
  • These findings indicate a marked upregulation of the NCX in human heart failure.

Conclusions:

  • Increased sarcolemmal NCX activity in human heart failure is attributed to elevated protein expression.
  • The enhanced NCX function may influence calcium extrusion and sodium influx, potentially affecting diastolic calcium overload and arrhythmogenesis.
Abstract

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