Key result
Spatially-detailed numerical model successfully reproduces SR Ca2+ blink kinetics in rabbit cardiomyocytes.
Why the study?
Disturbance of sarcoplasmic reticulum Ca2+ dynamics causes cardiovascular diseases, but research on the regulatory mechanism of SR Ca2+ is lacking.
A newly developed spatially-detailed numerical model successfully reproduces the spatiotemporal dynamics of sarcoplasmic reticulum Ca2+ blinks in rabbit cardiomyocytes.
Validates detailed Ca2+ modeling in rabbit cells; leaves open translation to human cardiomyocytes and clinical relevance.
Ca²⁺ in cardiac myocyte are mainly stored in the sarcoplasmic reticulum (SR), the disturbance of Ca²⁺ dynamics in the SR can cause various cardiovascular diseases. However, there is a lack of research on regulatory mechanism of SR Ca²⁺ . In this paper, we developed a spatially-detailed numerical model for Ca²⁺ blink to analyze Ca²⁺ spatiotemporal dynamic characteristics in junctional SR (jSR) cisternae of rabbit cardiomyocytes. The geometric model is constructed by 2- dimensional unstructured triangular meshes with a combined method of Delaunay Triangulations (DT) and Advancing Front Technique (AFT). The numerical method for solving the governing equations adopts Basic Function Method based on unstructured triangular meshes. Finally, our model is well reproduced the SR Ca²⁺ kinetics of Ca²⁺ blink and simulated results well match the results of a recent biological experiment.
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Liang et al. (2023) studied this question. Spatially-detailed numerical model was evaluated on Ca2+ spatiotemporal dynamic characteristics in junctional SR cisternae. A spatially-detailed numerical model successfully reproduced the sarcoplasmic reticulum Ca2+ kinetics of Ca2+ blink in rabbit cardiomyocytes, matching recent biological experiments.
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