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p66Shc restrains Ras hyperactivation and suppresses metastatic behavior

Oncogene volume 29, pages 5559–5567 (2010)Cite this article

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Abstract

Normal tissue cells survive and proliferate only while anchored to solid substrate. Conversely, transformed cells both survive and proliferate following detachment, having lost attachment context through unclear mechanisms. p66Shc is a focal adhesion-associated protein that reports cell attachment through a RhoA-dependent mechanosensory test. We find that human small cell lung cancer (SCLC) cells and mouse Lewis lung carcinoma (LLC), which display aggressive metastatic behavior, lack both p66Shc and retinoblastoma (pRB) and bypass anoikis. Re-expression of p66Shc in these cells restores anoikis and provides striking protection from metastasis by LLC cells in vivo. Notably, knockdown of p66Shc in normal epithelial cells leads to unrestrained Ras activation, preventing anoikis through downstream suppression of RhoA but blocking proliferation in a pRB-dependent manner, thus mimicking oncogenic Ras. Conversely, LLC and SCLC cells display constitutive Ras activation necessary to bypass anoikis, which is reversed by re-expression of p66Shc. p66Shc therefore coordinates Ras-dependent control of proliferation and anchorage sensation, which can be defeated in the evolution of highly metastatic tumors by combined loss of both p66Shc and pRB.

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Acknowledgements

We are grateful to Dr John Shelton for assistance with histology and Drs Ralph P Mason and Li Liu for technical support with in vivo GFP imaging. This work was supported by grants to LST by the NHLBI (R01-HL067256 and R01-HL061897).

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Author notes

  1. Z Ma & Z Liu

    Present address: 3Current address: Research Center of Basic Medical Sciences, Tianjin Medical University, Tianjin 300070, PR China.,

  2. Z Ma and Z Liu: These authors contributed equally to this work.

Authors and Affiliations

  1. Department of Internal Medicine, Division of Pulmonary and Critical Care, University of Texas Southwestern Medical Center, Dallas, TX, USA

    Z Ma, Z Liu, R-F Wu & L S Terada

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  1. Z Ma
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  2. Z Liu
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Correspondence to L S Terada.

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Ma, Z., Liu, Z., Wu, RF. et al. p66Shc restrains Ras hyperactivation and suppresses metastatic behavior. Oncogene 29, 5559–5567 (2010). https://doi.org/10.1038/onc.2010.326

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