Open AccessA mathematical model of the regulation of the G 1 phase of Rb +/+ and Rb —/— mouse embryonic fibroblasts and an osteosarcoma cell line
Author(s) -
Obeyesekere M. N.,
Knudsen E. S.,
Wang J. Y. J.,
Zimmerman S. O.
Publication year - 1997
Publication title -
cell proliferation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.647
H-Index - 74
eISSN - 1365-2184
pISSN - 0960-7722
DOI - 10.1111/j.1365-2184.1997.tb00933.x
Subject(s) - cyclin , cyclin d1 , embryonic stem cell , cell cycle , microbiology and biotechnology , cell culture , embryo , osteosarcoma , e2f , biology , chemistry , cell , cancer research , biochemistry , genetics , gene
A mathematical model integrating the roles of cyclin D, cdk4, cyclin E, cdk2, E2F and RB in control of the G 1 phase of the cell cycle is described. Experimental results described with murine embryo fibroblasts (MEFs), either Rb +/+ or Rb —/—, and with the RB‐deficient osteosarcoma cell line, Saos‐2, served as the basis for the formulation of this mathematical model. A model employing the known interactions of these six proteins does not reproduce the experimental observations described in the MEFs. The appropriate modelling of G 1 requires the inclusion of a sensing mechanism which adjusts the activity of cyclin E/cdk2 in response to both RB concentration and growth factors. Incorporation of this sensing mechanism into the model allows it to reproduce most of the experimental results observed in Saos‐2 cells, Rb —/— MEFS, and Rb +/+ MEFs. The model also makes specific predictions which have not been tested experimentally.