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Mol Cell Biol. 1994 June; 14(6): 3683-3694

A novel inhibitor of cyclin-Cdk activity detected in transforming growth factor beta-arrested epithelial cells.

J M Slingerland, L Hengst, C H Pan, D Alexander, M R Stampfer and S I Reed

Department of Molecular Biology, Scripps Research Institute, La Jolla, California 92037.

ABSTRACT

Transforming growth factor beta (TGF-beta) is a potent inhibitor of epithelial cell growth. Cyclins E and A in association with Cdk2 have been shown to play a role in the G1-to-S phase transition in mammalian cells. We have studied the effects of TGF-beta-mediated growth arrest on G1/S cyclins E and A. Inhibition of cyclin A-associated kinase by TGF-beta is primarily due to a decrease in cyclin A mRNA and protein. By contrast, while TGF-beta inhibits accumulation of cyclin E mRNA, the reduction in cyclin E protein is minimal. Instead, we find that the activation of cyclin E-associated kinase that normally accompanies the G1-to-S phase transition is inhibited. A novel inhibitor of cyclin-Cdk complexes was detected in TGF-beta-treated cell lysates. Inhibition is mediated by a heat-stable protein that targets both Cdk2 and Cdc2 kinases. In G0-arrested cells, a similar inhibitor of Cdk2 kinase was detected. These data suggest the existence of an inhibitor of cyclin-dependent kinases induced under different conditions to mediate antiproliferative responses.

Mol Cell Biol. 1994 June; 14(6): 3683-3694




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