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Molecular and Cellular Biology, May 2002, p. 3014-3023, Vol. 22, No. 9
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.9.3014-3023.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

MAD1 and p27KIP1 Cooperate To Promote Terminal Differentiation of Granulocytes and To Inhibit Myc Expression and Cyclin E-CDK2 Activity

Grant A. McArthur,1,2 Kevin P. Foley,1,{dagger} Matthew L. Fero,1 Carl R. Walkley,2 Andrew J. Deans,2 James M. Roberts,1 and Robert N. Eisenman1*

Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98109-1024,1 Divisions of Research and Haematology/Medical Oncology, Peter MacCallum Cancer Institute, East Melbourne, Victoria 3002, Australia2

Received 17 July 2001/ Returned for modification 4 September 2001/ Accepted 6 February 2002

To understand how cellular differentiation is coupled to withdrawal from the cell cycle, we have focused on two negative regulators of the cell cycle, the MYC antagonist MAD1 and the cyclin-dependent kinase inhibitor p27KIP1. Generation of Mad1/p27KIP1 double-null mice revealed a number of synthetic effects between the null alleles of Mad1 and p27KIP1, including embryonic lethality, increased proliferation, and impaired differentiation of granulocyte precursors. Furthermore, with granulocyte cell lines derived from the Mad1/p27KIP1 double-null mice, we observed constitutive Myc expression and cyclin E-CDK2 kinase activity as well as impaired differentiation following treatment with an inducer of differentiation. By contrast, similar treatment of granulocytes from Mad1 or p27KIP1 single-null mice resulted in differentiation accompanied by downregulation of both Myc expression and cyclin E-CDK2 kinase activity. In the double-null granulocytic cells, addition of a CDK2 inhibitor in the presence of differentiation inducer was sufficient to restore differentiation and reduce Myc levels. We conclude that Mad1 and p27KIP1 operate, at least in part, by distinct mechanisms to downregulate CDK2 activity and Myc expression in order to promote cell cycle exit during differentiation.

* Corresponding author. Mailing address: Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. North, Mailstop A2-025, P.O. Box 19024, Seattle, WA 98109-1024. Phone: (206) 667-4445. Fax: (206) 667-6522. E-mail: eisenman{at}fhcrc.org.

{dagger} Present address: Millennium Pharmaceuticals, Inc., Cambridge, MA 02139.

Molecular and Cellular Biology, May 2002, p. 3014-3023, Vol. 22, No. 9
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.9.3014-3023.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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