Cell-to-cell coordination for the spontaneous cAMP oscillation in Dictyostelium.
We propose a new cellular dynamics scheme for the spontaneous cAMP oscillations in Dictyostelium discoideum. Our scheme seamlessly integrates both receptor dynamics and G-protein dynamics into our previously developed cellular dynamics scheme. Extensive computer simulation studies based on our new cellular dynamics scheme were conducted in mutant cells to evaluate the molecular network. The validity of our proposed molecular network as well as the controversial PKA-dependent negative feedback mechanism was supported by our simulation studies. Spontaneous cAMP oscillations were not observed in a single mutant cell. However, multicellular states of various mutant cells consistently initiated spontaneous cAMP oscillations. Therefore, cell-to-cell coordination via the cAMP receptor is essential for the robust initiation of spontaneous cAMP oscillations.
Department of Bioinformatics, Ritsumeikan University, 1-1-1 Nojihigashi, Shiga 525-8577, Japan.
Seido
S
Nagano
Life Science Production Div., NOF Corporation, 5-10 Tokodai, Tsukuba 300-2635, Japan.
Shunsuke
S
Sakurai
D015105:3',5'-Cyclic-AMP Phosphodiesterases / Q000378:metabolism; D002449:Cell Aggregation; D002450:Cell Communication; D000242:Cyclic AMP / Q000378:metabolism*; D017868:Cyclic AMP-Dependent Protein Kinases / Q000378:metabolism; D004023:Dictyostelium / Q000166:cytology* / Q000378:metabolism; D019950:Mitogen-Activated Protein Kinase 1 / Q000037:antagonists & inhibitors; D008954:Models, Biological; D015800:Protozoan Proteins / Q000378:metabolism
D015800:Protozoan Proteins; D000242:Cyclic AMP; D017868:Cyclic AMP-Dependent Protein Kinases; D019950:Mitogen-Activated Protein Kinase 1; D015105:3',5'-Cyclic-AMP Phosphodiesterases; C112742:regA protein, Dictyostelium