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Vol. 95, Issue 26, 15406-15411, December 22, 1998

Cell Biology
 PTEN/MMAC1/TEP1 suppresses the tumorigenicity and induces G1 cell cycle arrest in human glioblastoma cells

(tumor suppressor / phosphatase / signal transduction)

Da-Ming Li and Hong Sun*

Department of Genetics, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520

Edited by Alfred G. Knudson, Jr., Institute for Cancer Research, Philadelphia, PA, and approved October 27, 1998 (received for review August 19, 1998)

PTEN/MMAC1/TEP1 is a tumor suppressor that possesses intrinsic phosphatase activity. Deletions or mutations of its encoding gene are associated with a variety of human cancers. However, very little is known about the molecular mechanisms by which this important tumor suppressor regulates cell growth. Here, we show that PTEN expression potently suppressed the growth and tumorigenicity of human glioblastoma U87MG cells. The growth suppression activity of PTEN was mediated by its ability to block cell cycle progression in the G1 phase. Such an arrest correlated with a significant increase of the cell cycle kinase inhibitor p27KIP1 and a concomitant decrease in the activities of the G1 cyclin-dependent kinases. PTEN expression also led to the inhibition of Akt/protein kinase B, a serine-threonine kinase activated by the phosphatidylinositol 3-kinase (PI 3-kinase) signaling pathway. In addition, the effect of PTEN on p27KIP1 and the cell cycle can be mimicked by treatment of U87MG cells with LY294002, a selective inhibitor of PI 3-kinase. Taken together, our studies suggest that the PTEN tumor suppressor modulates G1 cell cycle progression through negatively regulating the PI 3-kinase/Akt signaling pathway, and one critical target of this signaling process is the cyclin-dependent kinase inhibitor p27KIP1.

*   To whom reprint requests should be addressed. e-mail: hong.sun{at}yale.edu.

Copyright © 1998 by The National Academy of Sciences  0027-8424/98/9515406-6$2.00/0
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