Abstract
We have investigated the regulation of urokinase (u-PA) mRNA in quiescent mouse fibroblasts and keratinocytes stimulated to divide by the addition of serum or epidermal growth factor (EGF), respectively. Serum stimulation of quiescent fibroblasts (BALB/c 3T3 or Swiss 3T3) results in an early and transient increase of u-PA mRNA level, which precedes by several hours the onset of DNA synthesis. A similar response is elicited by EGF stimulation of quiescent keratinocytes. The increase of u-PA mRNA parallels that of c-myc mRNA, does not require protein synthesis and is at least in part due to increase in template activity of the u-PA gene. Induction of terminal differentiation of mouse keratinocytes results in a decrease of u-PA mRNA which parallels the decrease of thymidine incorporation. In conclusion, variation in the level of u-PA mRNA is seen during G0/G1 transition and correlates with the proliferative state of these normal mouse cells.
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