Differential modulation of G1 cyclins and the Cdk inhibitor p27kip1 by platelet-derived growth factor and plasma factors in density-arrested fibroblasts.


Stimulation of quiescent Balb/c 3T3 fibroblasts into S phase requires the synergistic action of platelet-derived growth factor (PDGF) and progression factors found in platelet-poor plasma (PPP). Traverse of the G1/S phase boundary and the initiation of DNA replication require functional cyclin E-cyclin-dependent kinase (Cdk) 2 and cyclin A-Cdk2 complexes… (More)


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