Regulation of p21^cip1 Expression by Growth Factors and the Extracellular Matrix Reveals a Role for Transient ERK Activity in G1 Phase

Correspondence to: Richard K. Assoian, Department of Pharmacology, University of Pennsylvania School of Medicine, 167 Johnson Pavilion, 3620 Hamilton Walk, Philadelphia, PA 19104-6084. Tel:(215) 898-7157 Fax:(215) 573-5656 E-mail:rka{at}pharm.med.upenn.edu.

We have examined the regulation of p21^cip1 by soluble mitogens and cell anchorage as well as the relationship between the expression of p21^cip1 and activation of the ERK subfamily of MAP kinases. We find that p21^cip1 expression in G1 phase can be divided into two discrete phases: an initial induction that requires growth factors and the activation of ERK, and then a subsequent decline that is enhanced by cell anchorage in an ERK-independent manner. In contrast to the induction of cyclin D1, the induction of p21^cip1 is mediated by transient ERK activity. Comparative studies with wild-type and p21^cip1-null fibroblasts indicate that adhesion-dependent regulation of p21^cip1 is important for proper control of cyclin E–cdk2 activity. These data lead to a model in which mitogens and anchorage act in a parallel fashion to regulate G1 phase expression of p21^cip1. They also show that (a) growth factors and growth factor/extracellular matrix cooperation can have different roles in regulating G1 phase ERK activity and (b) both transient and sustained ERK signals have functionally significant roles in controlling cell cycle progression through G1 phase.

Key Words: cell cycle, adhesion, ECM, MAP, kinase, cdk inhibitors

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