PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest

Jiyong Liang, Judit Zubovitz, Teresa Petrocelli, Rouslan Kotchetkov, Michael K. Connor, Kathy Han, Jin hwa Lee, Sandra Ciarallo, Charles Catzavelos, Richard Beniston, Edmee Franssen, Joyce M Slingerland

Research output: Contribution to journalArticle

746 Citations (Scopus)

Abstract

Mechanisms linking mitogenic and growth inhibitory cytokine signaling and the cell cycle have not been fully elucidated in either cancer or in normal cells. Here we show that activation of protein kinase B (PKB)/Akt contributes to resistance to antiproliferative signals and breast cancer progression in part by impairing the nuclear import and action of p27. Akt transfection caused cytoplasmic p27 accumulation and resistance to cytokine-mediated G1 arrest. The nuclear localization signal of p27 contains an Akt consensus site at threonine 157, and p27 phosphorylation by Akt impaired its nuclear import in vitro. Akt phosphorylated wild-type p27 but not p27T157A. In cells transfected with constitutively active AktT308DS473D (PKBDD), p27WT mislocalized to the cytoplasm, but p27T157A was nuclear. In cells with activated Akt, p27WT failed to cause G1 arrest, while the antiproliferative effect of p27T157A was not impaired. Cytoplasmic p27 was seen in 41% (52 of 128) of primary human breast cancers in conjunction with Akt activation and was correlated with a poor patient prognosis. Thus, we show a novel mechanism whereby Akt impairs p27 function that is associated with an aggressive phenotype in human breast cancer.

Original languageEnglish
Pages (from-to)1153-1160
Number of pages8
JournalNature Medicine
Volume8
Issue number10
DOIs
StatePublished - Oct 1 2002
Externally publishedYes

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Proto-Oncogene Proteins c-akt
Cell Nucleus Active Transport
Chemical activation
Breast Neoplasms
Cytokines
Phosphorylation
Threonine
Nuclear Localization Signals
Cells
Transfection
Cell Cycle
Cytoplasm
Phenotype
Growth
Neoplasms

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Medicine(all)

Cite this

Liang, J., Zubovitz, J., Petrocelli, T., Kotchetkov, R., Connor, M. K., Han, K., ... Slingerland, J. M. (2002). PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest. Nature Medicine, 8(10), 1153-1160. https://doi.org/10.1038/nm761

PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest. / Liang, Jiyong; Zubovitz, Judit; Petrocelli, Teresa; Kotchetkov, Rouslan; Connor, Michael K.; Han, Kathy; Lee, Jin hwa; Ciarallo, Sandra; Catzavelos, Charles; Beniston, Richard; Franssen, Edmee; Slingerland, Joyce M.

In: Nature Medicine, Vol. 8, No. 10, 01.10.2002, p. 1153-1160.

Research output: Contribution to journalArticle

Liang, J, Zubovitz, J, Petrocelli, T, Kotchetkov, R, Connor, MK, Han, K, Lee, JH, Ciarallo, S, Catzavelos, C, Beniston, R, Franssen, E & Slingerland, JM 2002, 'PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest', Nature Medicine, vol. 8, no. 10, pp. 1153-1160. https://doi.org/10.1038/nm761
Liang J, Zubovitz J, Petrocelli T, Kotchetkov R, Connor MK, Han K et al. PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest. Nature Medicine. 2002 Oct 1;8(10):1153-1160. https://doi.org/10.1038/nm761
Liang, Jiyong ; Zubovitz, Judit ; Petrocelli, Teresa ; Kotchetkov, Rouslan ; Connor, Michael K. ; Han, Kathy ; Lee, Jin hwa ; Ciarallo, Sandra ; Catzavelos, Charles ; Beniston, Richard ; Franssen, Edmee ; Slingerland, Joyce M. / PKB/Akt phosphorylates p27, impairs nuclear import of p27 and opposes p27-mediated G1 arrest. In: Nature Medicine. 2002 ; Vol. 8, No. 10. pp. 1153-1160.
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