A reaction-diffusion model shows that workload-dependent alteration of ADP concentration in the compartmentalized creatine kinase system, along with Pi changes, regulates respiration in muscle cells.
This computational model suggests that compartmentalized changes in ADP and Pi concentrations are key regulators of mitochondrial respiration in working heart cells.
The purpose of this study is to investigate theoretically which intracellular factors may be important for regulation of mitochondrial respiration in working heart cells in vivo. We have developed a model that describes quantitatively the published experimental data on dependence of the rate of oxygen consumption and metabolic state of working isolated perfused rat heart on workload over its physiological range (Williamson JR, Ford G, Illingworth J, Safer B. Circ Res 38, Suppl I, I39-I51, 1976). Analysis of this model shows that for phosphocreatine, creatine, and ATP the equilibrium assumption is an acceptable approximation with respect to their diffusion in the intracellular bulk water phase. However, the ADP concentration changes in the contraction cycle in a nonequilibrium workload-dependent manner, showing the existence of the intracellular concentration gradients. The model shows that workload-dependent alteration of ADP concentration in the compartmentalized creatine kinase system may be taken, together with the changes in P(i) concentration, to be among the major components of the metabolic feedback signal for regulation of respiration in muscle cells.
Vendelin et al. (Sat,) conducted a other in Mitochondrial respiration in working heart cells. Reaction-diffusion model of energy transfer was evaluated on Intracellular factors regulating mitochondrial respiration. A reaction-diffusion model shows that workload-dependent alteration of ADP concentration in the compartmentalized creatine kinase system, along with Pi changes, regulates respiration in muscle cells.
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