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MBC in Press, published online ahead of print February 21, 2007
Mol. Biol. Cell 10.1091/mbc.E06-10-0908

A more recent version of this article appeared on April 1, 2007
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Submitted on October 11, 2006
Revised on January 30, 2007
Accepted on February 5, 2007

ERK Activity and G1 Phase Progression: Identifying Dispensable Versus Essential Activities and Primary Versus Secondary Targets

Jessie Villanueva,* Yuval Yung,* Janice L. Walker, and Richard K. Assoian

Department of Pharmacology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104-6084

Monitoring Editor: Jean Schwarzbauer

The ERK subfamily of MAP kinases is a critical regulator of S phase entry. ERK activity regulates the induction of cyclin D1, and a sustained ERK signal is thought to be required for this effect, at least in fibroblasts. We now show that early G1 phase ERK activity is dispensable for the induction of cyclin D1, and that the critical ERK signaling period is restricted to 3-6 h after mitogenic stimulation of quiescent fibroblasts. Similarly, early G1 phase ERK activity is dispensable for entry into S phase. Moreover, if cyclin D1 is expressed ectopically, ERK activity becomes dispensable throughout G1 phase. In addition to its effect on cyclin D1, ERK activity is thought to contribute to the down-regulation of p27kip1. We found that this effect is restricted to late G1/S phase. Mechanistic analysis showed that the ERK effect on p27kip1 is mediated by Skp2 and secondary to its effect on cyclin D1. Our results emphasize the importance of midG1 phase ERK activity and resolve primary versus secondary ERK targets within the G1 phase cyclin-dependent kinases.

*These authors contributed equally to this work.

Address correspondence to: Richard K. Assoian (rka{at}pharm.med.upenn.edu)




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