Abstract
BHK fibroblasts can be growth arrested by incubation in low serum (0.1%) medium. Growth is initiated by incubating cells in high serum (10%) medium. We have found that if the quiescent cells in low serum medium are incubated with insulin, the G0 to S transit time is decreased by two to six hours when serum (10%) is added back to the culture. The effect of insulin treatment of quiescent cells on the cellular phosphoprotein profile was examined. It was found that insulin stimulated the phosphorylation of a 96,000 dalton cytosol protein. This protein is also intensely phosphorylated in proliferating cells and may be one of the critical intracellular events to occur when a cell initiates growth.
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