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[Cancer Research 58, 5285-5290, December 1, 1998]
© 1998 American Association for Cancer Research

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Adenoviral Transgene Expression of MMAC/PTEN in Human Glioma Cells Inhibits Akt Activation and Induces Anoikis1

Michael A. Davies2, Yiling Lu2, Tetsuro Sano, Xianjun Fang, Ping Tang, Ruth LaPushin, Dimpy Koul, Robert Bookstein, David Stokoe, W. K. Alfred Yung, Gordon B. Mills and Peter A. Steck3

Department of Neuro-Oncology and The Brain Tumor Center [M. A. D., T. S., P. T., D. K., W. K. A. Y., P. A. S.] and Department of Molecular Oncology [Y. L., X. F., R. L., G. B. M.], The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030; Canji Inc., San Diego, California 92121 [R. B.]; and Cancer Research Institute, University of California, San Francisco, California 94115 [D. S.]

The MMAC/PTEN tumor suppressor gene encodes for a phosphatase that recently has been shown to have phosphotidylinositol phosphatase activity, implicating its possible involvement in phosphatidylinositol 3'-kinase-mediated signaling. To investigate possible alterations in growth factor-mediated signal transduction, an adenovirus containing MMAC/PTEN, Ad-MMAC, previously shown to inhibit growth and tumorigenicity in glioma cells, was used to acutely express the transgene. Human glioma cells infected with Ad-MMAC but not with control adenoviruses exhibited an inhibition of phosphorylation of both activating residues of Akt, Ser-473, and Thr-308, along with Akt's serine/threonine kinase activity, without significantly altering Akt expression. The effects of functional MMAC/PTEN expression were relatively specific, because members of several other growth factor-mediated signaling pathways showed no altered responses. The presence of MMAC/PTEN also inhibited phosphorylation of BAD, although no evidence of apoptosis in the in situ treated cells was observed. However, U251 glioma cells infected with Ad-MMAC were induced to undergo anoikis at a significantly higher rate than U251 cells treated with control viruses or mock infected with media. These results demonstrate that the acute administration of MMAC/PTEN results in the inhibition of Akt-mediated signaling, growth inhibition, and anoikis, implying that loss of MMAC/PTEN increases cellular proliferation and significantly augments a cell's survival potential during cellular processes that are associated with malignancy.

1 Supported by NIH Grants CA56041 and CA55261, State of Texas Advanced Technology Program Grant 97-110, and the Pediatric Brain Tumor Foundation (to P. A. S.) and NIH Grant CA71418 (to G. B. M.).

2 The first two authors contributed equally to this work.

3 To whom requests for reprints should be addressed, at Department of Neuro-Oncology, The University of Texas M. D. Anderson Cancer Center, Box 316, 1515 Holcombe Boulevard, Houston, TX 77030. Phone: (713) 792-3003; Fax: (713) 745-1183; E-mail: steckpa@audumla.mdacc.tmc.edu.

Received 8/20/98. Accepted 10/16/98.




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