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[Cancer Research 66, 2162-2172, February 15, 2006]
© 2006 American Association for Cancer Research

Cell, Tumor, and Stem Cell Biology

Reduction of Cytosolic p27Kip1 Inhibits Cancer Cell Motility, Survival, and Tumorigenicity

Frederick Y. Wu1, Shizhen Emily Wang2, Melinda E. Sanders3,4, Incheol Shin2,5, Federico Rojo6, Jose Baselga6 and Carlos L. Arteaga1,2,4

Departments of 1 Medicine, 2 Cancer Biology, and 3 Pathology and 4 Breast Cancer Research Program, Vanderbilt-Ingram Comprehensive Cancer Center, Vanderbilt University School of Medicine, Nashville, Tennessee; 5 Department of Life Sciences, Hanyang University, Seoul, South Korea; and 6 Oncology Service, Vall d'Hebron University Hospital, Barcelona, Spain

Requests for reprints: Carlos L. Arteaga, Division of Oncology, Vanderbilt University Medical Center, 2220 Pierce Avenue, 777 PRB, Nashville, TN 37232-6307. Phone: 615-936-3524; Fax: 615-936-1790; E-mail: carlos.arteaga{at}vanderbilt.edu.

We generated a p27Kip1 mutant (p27{Delta}NLS) that localized exclusively in cell cytosol. Expression of p27{Delta}NLS in MCF7 breast cancer cells down-regulated RhoA and increased motility, survival, and Akt levels without an effect on cell cycle distribution. RNA interference of p27 in U87 glioma cells, which express p27 predominantly in the cytoplasm, inhibited motility and survival. Conversely, knockdown of p27 in COS7 cells, with >95% nuclear p27 expression, accelerated proliferation but had no effect on motility or survival. U87 cells in which p27 had been eliminated by RNA interference exhibited lower Akt levels, shorter Akt turnover, and markedly impaired tumorigenicity in vivo. These xenografts were less invasive and exhibited increased apoptosis compared with p27-expressing tumors. Expression of cytosolic p27 in primary human breast carcinomas correlated linearly with Akt content as measured by immunohistochemistry. These data suggest that cytoplasmic p27 can exert oncogenic functions by modulating Akt stability, cell survival, and tumorigenicity. (Cancer Res 2006; 66(4): 2162-72)




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Copyright © 2006 by the American Association for Cancer Research.