Cytoplasmic localization of p21 CIP1/WAF1 by Akt-induced phosphorylation in HER-2/neu-overexpressing cells

B. P. Zhou; Y. Liao; W. Xia; B. Spohn; M. H. Lee; M. C. Hung

doi:10.1038/35060032

Cytoplasmic localization of p21 ^CIP1/WAF1 by Akt-induced phosphorylation in HER-2/neu-overexpressing cells

B. P. Zhou, Y. Liao, W. Xia, B. Spohn, M. H. Lee, M. C. Hung

Research output: Contribution to journal › Article › peer-review

959 Scopus citations

Abstract

Amplification or overexpression of HER-2/neu in cancer cells confers resistance to apoptosis and promotes cell growth. The cellular localization of p21^Cip1/WAF1 has been proposed to be critical either in promoting cell survival or in inhibiting cell growth. Here we show that HER-2/neu-mediated cell growth requires the activation of Akt, which associates with p21^Cip1/WAF1 and phosphorylates it at threonine 145, resulting in cytoplasmic localization of p21^Cip1/WAF1. Furthermore, blocking the Akt pathway with a dominant-negative Akt mutant restores the nuclear localization and cell-growth-inhibiting activity of p21^Cip1/WAF1. Our results indicate that HER-2/neu induces cytoplasmic localization of p21^Cip1/WAF1 through activation of Akt to promote cell growth, which may have implications for the oncogenic activity of HER-2/neu and Akt.

Original language	English
Pages (from-to)	245-252
Number of pages	8
Journal	Nature Cell Biology
Volume	3
Issue number	3
DOIs	https://doi.org/10.1038/35060032
State	Published - 2001

Bibliographical note

Funding Information:
ACKNOWLEDGEMENTS We thank D. Yu, R. B. Arlinghaus and W. H. Klein for critical comments on the manuscript. This work was supported by grants from the National Institutes of Health (to M-C.H.), by a SPORE grant in ovarian cancer (to M-C.H.), and by the Nellie Connally Breast Cancer Research Fund at the M. D. Anderson Cancer Center (M-C.H.). B.P.Z. is a recipient of a postdoctoral fellowship from the US Department of Defense Breast Cancer Research. Correspondence and requests for materials should be addressed to M-C.H.

ASJC Scopus subject areas

Cell Biology

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This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1038/35060032

Cite this

@article{37f45bfeddc541e393a4218c012904dd,

title = "Cytoplasmic localization of p21 CIP1/WAF1 by Akt-induced phosphorylation in HER-2/neu-overexpressing cells",

abstract = "Amplification or overexpression of HER-2/neu in cancer cells confers resistance to apoptosis and promotes cell growth. The cellular localization of p21Cip1/WAF1 has been proposed to be critical either in promoting cell survival or in inhibiting cell growth. Here we show that HER-2/neu-mediated cell growth requires the activation of Akt, which associates with p21Cip1/WAF1 and phosphorylates it at threonine 145, resulting in cytoplasmic localization of p21Cip1/WAF1. Furthermore, blocking the Akt pathway with a dominant-negative Akt mutant restores the nuclear localization and cell-growth-inhibiting activity of p21Cip1/WAF1. Our results indicate that HER-2/neu induces cytoplasmic localization of p21Cip1/WAF1 through activation of Akt to promote cell growth, which may have implications for the oncogenic activity of HER-2/neu and Akt.",

author = "Zhou, {B. P.} and Y. Liao and W. Xia and B. Spohn and Lee, {M. H.} and Hung, {M. C.}",

note = "Funding Information: ACKNOWLEDGEMENTS We thank D. Yu, R. B. Arlinghaus and W. H. Klein for critical comments on the manuscript. This work was supported by grants from the National Institutes of Health (to M-C.H.), by a SPORE grant in ovarian cancer (to M-C.H.), and by the Nellie Connally Breast Cancer Research Fund at the M. D. Anderson Cancer Center (M-C.H.). B.P.Z. is a recipient of a postdoctoral fellowship from the US Department of Defense Breast Cancer Research. Correspondence and requests for materials should be addressed to M-C.H.",

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AU - Zhou, B. P.

AU - Liao, Y.

AU - Xia, W.

AU - Spohn, B.

AU - Lee, M. H.

AU - Hung, M. C.

N1 - Funding Information: ACKNOWLEDGEMENTS We thank D. Yu, R. B. Arlinghaus and W. H. Klein for critical comments on the manuscript. This work was supported by grants from the National Institutes of Health (to M-C.H.), by a SPORE grant in ovarian cancer (to M-C.H.), and by the Nellie Connally Breast Cancer Research Fund at the M. D. Anderson Cancer Center (M-C.H.). B.P.Z. is a recipient of a postdoctoral fellowship from the US Department of Defense Breast Cancer Research. Correspondence and requests for materials should be addressed to M-C.H.

PY - 2001

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N2 - Amplification or overexpression of HER-2/neu in cancer cells confers resistance to apoptosis and promotes cell growth. The cellular localization of p21Cip1/WAF1 has been proposed to be critical either in promoting cell survival or in inhibiting cell growth. Here we show that HER-2/neu-mediated cell growth requires the activation of Akt, which associates with p21Cip1/WAF1 and phosphorylates it at threonine 145, resulting in cytoplasmic localization of p21Cip1/WAF1. Furthermore, blocking the Akt pathway with a dominant-negative Akt mutant restores the nuclear localization and cell-growth-inhibiting activity of p21Cip1/WAF1. Our results indicate that HER-2/neu induces cytoplasmic localization of p21Cip1/WAF1 through activation of Akt to promote cell growth, which may have implications for the oncogenic activity of HER-2/neu and Akt.

AB - Amplification or overexpression of HER-2/neu in cancer cells confers resistance to apoptosis and promotes cell growth. The cellular localization of p21Cip1/WAF1 has been proposed to be critical either in promoting cell survival or in inhibiting cell growth. Here we show that HER-2/neu-mediated cell growth requires the activation of Akt, which associates with p21Cip1/WAF1 and phosphorylates it at threonine 145, resulting in cytoplasmic localization of p21Cip1/WAF1. Furthermore, blocking the Akt pathway with a dominant-negative Akt mutant restores the nuclear localization and cell-growth-inhibiting activity of p21Cip1/WAF1. Our results indicate that HER-2/neu induces cytoplasmic localization of p21Cip1/WAF1 through activation of Akt to promote cell growth, which may have implications for the oncogenic activity of HER-2/neu and Akt.

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