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Inhibition of protein synthesis by cycloheximide blocks subsequent division of a mammalian cell, but only if the cell is exposed to the drug before the "restriction point" (i.e. within the first several hours after birth). If exposed to cycloheximide after the restriction point, a cell proceeds with DNA synthesis, mitosis and cell division and halts in the next cell cycle. If cycloheximide is later removed from the culture medium, treated cells will return to the division cycle, showing a complex pattern of division times post-treatment, as first measured by Zetterberg and colleagues. We simulate these physiological responses of mammalian cells to transient inhibition of growth, using a set of nonlinear differential equations based on a realistic model of the molecular events underlying progression through the cell cycle. The model relies on our earlier work on the regulation of cyclin-dependent protein kinases during the cell division cycle of yeast. The yeast model is supplemented with equations describing the effects of retinoblastoma protein on cell growth and the synthesis of cyclins A and E, and with a primitive representation of the signaling pathway that controls synthesis of cyclin D.

Type

Journal article

Journal

J Theor Biol

Publication Date

2004

Volume

230

Pages

563 - 579

Keywords

Animals Cell Cycle/drug effects/genetics/*physiology Cell Division/drug effects/physiology Computational Biology/methods Computer Simulation Cyclin-Dependent Kinases/physiology Cycloheximide/pharmacology Mammals/*physiology *Models, Biological Protein Synthesis Inhibitors/pharmacology Retinoblastoma Protein/pharmacology