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Contribution of myocardial diffuse double-layer calcium to contractile function.

M Fintel, G A Langer, J C Rohloff

The American Journal of Physiology

|November 1, 1985

Summary

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Diffuse double-layer calcium significantly impacts cardiac function. Manipulating this calcium layer, using dimethonium, altered myocardial contractility, supporting Gouy-Chapman theory in cardiac excitation-contraction coupling.

Area of Science:

Cardiology
Biophysics
Cell Physiology

Background:

Cardiac excitation-contraction coupling relies on calcium ions.
The diffuse double layer near the sarcolemma influences local ion concentrations.
Understanding this layer's calcium dynamics is crucial for cardiac function.

Purpose of the Study:

To investigate the role of diffuse double-layer calcium in cardiac excitation-contraction coupling.
To determine if Gouy-Chapman theory applies to calcium in the myocardial diffuse double layer.
To assess the impact of altering diffuse double-layer calcium on myocardial contractility.

Main Methods:

Experiments utilized rabbit interventricular septa and neonatal rat myocardial cells.
Sarcolemmal membranes were gas-dissected for analysis.

Related Experiment Videos

The divalent cation dimethonium served as a specific probe for the diffuse double layer.

Ionic composition was manipulated using sucrose and LiCl in low-sodium perfusates.

Main Results:

Dimethonium (10 mM) reduced calcium uptake and contractility during low-sodium perfusion with sucrose.
This effect was not observed with LiCl or during control perfusion.
Results indicate diffuse double-layer calcium can be modulated consistent with Gouy-Chapman theory.
Changes in diffuse double-layer calcium correlated with significant, albeit small (7.8%), contractility changes.

Conclusions:

Calcium within the myocardial diffuse double layer is dynamically regulated.
Modulation of diffuse double-layer calcium influences cardiac contractility.
Findings support the applicability of Gouy-Chapman theory to cardiac electrophysiology.