Abstract
Mathematical models simulating the dynamics of calcium redistribution (elicited by experimental interference with the pathways of calcium fluxes) in cellular compartments have been developed, based on a minimal scheme of the pathways of calcium fluxes in nonexcitable cells suspended in calcium-free medium. The models are consistent with available experimental data. All parameters are quantitatively related to the intrinsic properties of calcium adenosine triphosphatases (ATPases) and cellular membranes; there is no interdependence between the parameters. The models can be used as the basis for quantitative analysis and interpretation of experimental data. The activities of plasma membrane and sarcoendoplasmic reticulum calcium ATPases (PMCA and SERCAs) are governed by different mechanisms. PMCA is likely to undergo transitions from inactive to active to “dormant” (not identical to the initial) and back to inactive states, the mean duration of the cycle lasting for minutes or longer. The sequence of the transitions is initiated, presumably, by an increase in cytosolic calcium concentration. The transition of PMCA from inactive to active (at least at low rates of increase in cytosolic calcium concentration) is likely to be slower than that from active to dormant. SERCA, presumably, transits from inactive to active state in response to increases in calcium leakage from calcium stores. Whereas PMCA extrudes excess calcium (a definite quantity of it) in a short pulse, SERCA retakes calcium back into the stores permanently at a high rate. The models presented here may be the best means for the moment to quantitatively relate the dynamics of calcium fluxes in nonexcitable cells with known or putative properties of the mechanisms underlying activation of calcium ATPases.
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Acknowledgment
I thank Prof. G. M. Salido, Dr. J. A. Rosado and Dr. P. C. Redondo for their comments on the manuscript and valuable suggestions, as well as PhD student T. Rekašius for his help with the probabilistic interpretations. Special thanks to my students D. Mažeika and R. Stupak for their interest and curiosity: Figure 1B , scheme 7 and equation 10 emerged due to attempts to best answer their questions. I also thank the reviewers for their comments and criticism, which helped to improve the paper.
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Juška, A. Dynamics of Calcium Fluxes in Nonexcitable Cells: Mathematical Modeling. J Membrane Biol 211, 89–99 (2006). https://doi.org/10.1007/s00232-005-7019-3
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DOI: https://doi.org/10.1007/s00232-005-7019-3