Abstract
The activity of the cyclin-dependent kinases (CDKs) that control cell growth and division can be negatively regulated by tyrosine phosphorylation or by the binding of various CDK inhibitors1. Whereas regulation by tyrosine phosphorylation is well documented in CDKs that function during mitosis, little is known about its role in the regulation of CDKs that act in the G1 phase of the cell cycle2. In contrast, much evidence has accumulated on the regulation of G1 CDKs by CDK inhibitors1. The cytokine TGF-β inhibits growth by causing cell-cycle arrest as a result of increasing the concentration of the Cdk4/6 inhibitor p15INK4B/MTS2 (refs 3, 4). Here we report that TGF-β can also cause the inhibition of Cdk4 and Cdk6 by increasing their level of tyrosine phosphorylation. Tyrosine phosphorylation and inactivation of Cdk4/6 in a human mammary epithelial cell line are shown to result from the ability of TGF-β to repress expression of the CDK tyrosine phosphatase Cdc25A. Repression of Cdc25A and induction of p15 are independent effects mediating the inhibition of Cdk4/6 by TFG-β.
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lavarone, A., Massagué, J. Repression of the CDK activator Cdc25A and cell-cycle arrest by cytokine TGF-β in cells lacking the CDK inhibitor p15. Nature 387, 417–422 (1997). https://doi.org/10.1038/387417a0
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DOI: https://doi.org/10.1038/387417a0
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