Unifying principles of calcium wave propagation - Insights from a three-dimensional model for atrial myocytes

Biochimica Et Biophysica Acta
Rüdiger ThulS Coombes

Abstract

Atrial myocytes in a number of species lack transverse tubules. As a consequence the intracellular calcium signals occurring during each heartbeat exhibit complex spatio-temporal dynamics. These calcium patterns arise from saltatory calcium waves that propagate via successive rounds of diffusion and calcium-induced calcium release. The many parameters that impinge on calcium-induced calcium release and calcium signal propagation make it difficult to know a priori whether calcium waves will successfully travel, or be extinguished. In this study, we describe in detail a mathematical model of calcium signalling that allows the effect of such parameters to be independently assessed. A key aspect of the model is to follow the triggering and evolution of calcium signals within a realistic three-dimensional cellular volume of an atrial myocyte, but with low computational costs. This is achieved by solving the linear transport equation for calcium analytically between calcium release events and by expressing the onset of calcium liberation as a threshold process. The model makes non-intuitive predictions about calcium signal propagation. For example, our modelling illustrates that the boundary of a cell produces a wave-guiding effect t...Continue Reading

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Citations

Jul 15, 2018·Journal of Mathematical Neuroscience·Markus Breit, Gillian Queisser
Jan 9, 2019·Frontiers in Physiology·Miquel Marchena, Blas Echebarria

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