Dynamical analysis of the calcium signaling pathway in cardiac myocytes based on logarithmic sensitivity analysis.
Many cellular functions are regulated by the Ca(2+) signal which contains specific information in the form of frequency, amplitude, and duration of the oscillatory dynamics. Any alterations or dysfunctions of components in the calcium signaling pathway of cardiac myocytes may lead to a diverse range of cardiac diseases including hypertrophy and heart failure. In this study, we have investigated the hidden dynamics of the intracellular Ca(2+) signaling and the functional roles of its regulatory mechanism through in silico simulations and parameter sensitivity analysis based on an experimentally verified mathematical model. It was revealed that the Ca(2+) dynamics of cardiac myocytes are determined by the balance among various system parameters. Moreover, it was found through the parameter sensitivity analysis that the self-oscillatory Ca(2+) dynamics are most sensitive to the Ca(2+) leakage rate of the sarcolemmal membrane and the maximum rate of NCX, suggesting that these two components have dominant effects on circulating the cytosolic Ca(2+).
Kim
Tae-Hwan
TH
Department of Bio and Brain Engineering and KI for the BioCentury, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.
Shin
Sung-Young
SY
Choo
Sang-Mok
SM
Cho
Kwang-Hyun
KH
D000200:Action Potentials / Q000502:physiology*; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D020013:Calcium Signaling / Q000502:physiology*; D003198:Computer Simulation; D006801:Humans; D008564:Membrane Potentials / Q000502:physiology*; D008955:Models, Cardiovascular; D032383:Myocytes, Cardiac / Q000502:physiology*
D002118:Calcium