A Stochastic Spatiotemporal Model of Rat Ventricular Myocyte Calcium Dynamics Demonstrated Necessary Features for Calcium Wave Propagation
dc.contributor.author | Hoang-Trong, Tuan Minh | |
dc.contributor.author | Ullah, Aman | |
dc.contributor.author | Lederer, William Jonathan | |
dc.contributor.author | Jafri, Mohsin Saleet | |
dc.date.accessioned | 2021-12-16T22:41:48Z | |
dc.date.available | 2021-12-16T22:41:48Z | |
dc.date.issued | 2021-11 | |
dc.description.abstract | Calcium (Ca2+) plays a central role in the excitation and contraction of cardiac myocytes. Experi-ments have indicated that calcium release is stochastic and regulated locally suggesting the pos-sibility of spatially heterogeneous calcium levels in the cells. This spatial heterogeneity might be important in mediating different signaling pathways. During more than 50 years of computa-tional cell biology, the computational models have been advanced to incorporate more ionic cur-rents, going from deterministic models to stochastic models. While periodic increases in cyto-plasmic Ca2+ concentration drive cardiac contraction, aberrant Ca2+ release can underly cardiac arrhythmia. However, the study of the spatial role of calcium ions has been limited due to the computational expense of using a three-dimensional stochastic computational model. In this pa-per, we introduce a three-dimensional stochastic computational model for rat ventricular myo-cytes at the whole-cell level that incorporate detailed calcium dynamics, with (1) non-uniform re-lease site placement, (2) non-uniform membrane ionic currents and membrane buffers, (3) sto-chastic calcium-leak dynamics and (4) non-junctional or rogue ryanodine receptors. The model simulates spark-induced spark activation and spark-induced Ca2+ wave initiation and propaga-tion that occur under conditions of calcium overload at the closed-cell condition, but not when Ca2+ levels are normal. This is considered important since the presence of Ca2+ waves contribute to the activation of arrhythmogenic currents. | |
dc.identifier.uri | https://hdl.handle.net/1920/12166 | |
dc.publisher | MDPI | |
dc.rights | Attribution-NonCommercial-NoDerivs 3.0 United States | |
dc.rights.uri | https://creativecommons.org/licenses/by-nc-nd/3.0/us/ | |
dc.subject | Arrhythmia | |
dc.subject | Calcium waves | |
dc.subject | Heart | |
dc.subject | Computational model | |
dc.title | A Stochastic Spatiotemporal Model of Rat Ventricular Myocyte Calcium Dynamics Demonstrated Necessary Features for Calcium Wave Propagation | |
dc.type | Article |
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