Mechano-calcium and mechano-electric feedbacks in the human cardiomyocyte analyzed in a mathematical model

The journal of physiological sciences

article

Nathalie A. Balakina-Vikulova¹  Alexander Panfilov²  Olga Solovyova¹  Leonid B. Katsnelson¹ 

[1] Institute of Immunology and Physiology of the Ural Branch of the Russian Academy of Sciences;Ural Federal University;Ghent University

关键词: Human myocardium;    Electromechanical coupling;    Mechano-electric feedback;   

DOI  :  10.1186/s12576-020-00741-6

来源: Springer

【 摘 要 】

Experiments on animal hearts (rat, rabbit, guinea pig, etc.) have demonstrated that mechano-calcium feedback (MCF) and mechano-electric feedback (MEF) are very important for myocardial self-regulation because they adjust the cardiomyocyte contractile function to various mechanical loads and to mechanical interactions between heterogeneous myocardial segments in the ventricle walls. In in vitro experiments on these animals, MCF and MEF manifested themselves in several basic classical phenomena (e.g., load dependence, length dependence of isometric twitches, etc.), and in the respective responses of calcium transients and action potentials. However, it is extremely difficult to study simultaneously the electrical, calcium, and mechanical activities of the human heart muscle in vitro. Mathematical modeling is a useful tool for exploring these phenomena. We have developed a novel model to describe electromechanical coupling and mechano-electric feedbacks in the human cardiomyocyte. It combines the ‘ten Tusscher–Panfilov’ electrophysiological model of the human cardiomyocyte with our module of myocardium mechanical activity taken from the ‘Ekaterinburg–Oxford’ model and adjusted to human data. Using it, we simulated isometric and afterloaded twitches and effects of MCF and MEF on excitation–contraction coupling. MCF and MEF were found to affect significantly the duration of the calcium transient and action potential in the human cardiomyocyte model in response to both smaller afterloads as compared to bigger ones and various mechanical interventions applied during isometric and afterloaded twitches.

【 授权许可】

Unknown