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Molecular and Cellular Biology, October 1998, p. 5699-5711, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Activation of Phosphatidylinositol 3-Kinase Is Sufficient for Cell Cycle Entry and Promotes Cellular Changes Characteristic of Oncogenic Transformation

Anke Klippel,* Maria-Amelia Escobedo, Matthew S. Wachowicz, Gerald Apell, Timothy W. Brown, Martin A. Giedlin, W. Michael Kavanaugh, and Lewis T. Williams

Chiron Corporation, Emeryville, California 94608

Received 26 March 1998/Returned for modification 5 May 1998/Accepted 21 July 1998

Using a new inducible form of phosphatidylinositol 3-kinase (PI 3-kinase) we have found that PI 3-kinase activation has the following effects on cell growth and proliferation. (i) Activation of PI 3-kinase was sufficient to promote entry into S phase of the cell cycle within several hours. This was shown by activation of cyclin-dependent kinase 4 (Cdk4) and Cdk2 and by the induction of DNA synthesis. (ii) PI 3-kinase activation alone was not, however, sufficient to provide for progression through the entire cell cycle. Instead, prolonged activation of PI 3-kinase in the absence of serum stimulation resulted in apoptosis. It is possible that the cells undergo apoptosis because the PI 3-kinase-induced entry into the cell cycle is abnormal. For example, we found that the cyclin E-Cdk2 complex, which normally disappears after entry into S phase of the cell cycle, fails to be downregulated following induction by PI 3-kinase. (iii) Finally, we found that prolonged activation of PI 3-kinase in the presence of serum resulted in cellular changes that resemble those associated with oncogenic transformation. The cells reached high densities, were irregular and refractile in appearance, and formed colonies in soft agar. In contrast, neither PI 3-kinase nor serum stimulation alone could induce these changes. Our results suggest that activation of PI 3-kinase promotes anchorage-independent cell growth and entry into the cell cycle but does not abrogate the growth factor requirement for cell proliferation.

* Corresponding author. Mailing address: Chiron Corporation, 4560 Horton St., LSC 4.506, Emeryville, CA 94608. Phone: (510) 923-4025. Fax: (510) 923-4115. E-mail: anke_klippel{at}cc.chiron.com.

Molecular and Cellular Biology, October 1998, p. 5699-5711, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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