Efficient and Detailed Model of the Local Ca2+ Release Unit in the Ventricular Cardiac Myocyte

Thomas Schendel (thomas.schendel@web.de)
Martin Falcke (martin.falcke@mdc-berlin.de)

Max Delbrück Centre of Moleculare Medicine, Robert-Rössle-Str. 10, Berlin, Germany, 13092


We present here an efficient but detailed approach to modelling Ca2+-induced Ca2+ release in the diadic cleft of cardiac ventricular myocytes. In this framework we developed a spatial resolved Ca2+ release unit (CaRU), consisting of the junctional sarcoplasmic reticulum and the diadic cleft, with a well defined channel placement. By taking advantage of time scale seperation, the model could be finally reduced to only one ordinary differential equation for describing Ca2+ fluxes and diffusion. Additionally the channel gating is described in a stochastic way. The resulting model is able to reproduce experimental findings like the gradedness of SR release, the voltage dependence of ECC gain and typical spark life time. Due to the numerical efficience of the model, it is suitable to use for whole cell simulations. The approach we want to use extend the developed CaRU to such a whole cell model is already outlined in this work.

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Japanese Society for Bioinformatics