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Snail regulates Nanog status during the epithelial-mesenchymal transition via the Smad1/Akt/GSK3? signaling pathway in non-small-cell lung cancer.


ABSTRACT: The epithelial-mesenchymal transition (EMT), a crucial step in cancer metastasis, is important in transformed cancer cells with stem cell-like properties. In this study, we established a Snail-overexpressing cell model for non-small-cell lung cancer (NSCLC) and investigated its underlying mechanism. We also identified the downstream molecular signaling pathway that contributes to the role of Snail in regulating Nanog expression. Our data shows that high levels of Snail expression correlate with metastasis and high levels of Nanog expression in NSCLC. NSCLC cells expressing Snail are characterized by active EMT characteristics and exhibit an increased ability to migrate, chemoresistance, sphere formation, and stem cell-like properties. We also investigated the signals required for Snail-mediated Nanog expression. Our data demonstrate that LY294002, SB431542, LDN193189, and Noggin pretreatment inhibit Snail-induced Nanog expression during EMT. This study shows a significant correlation between Snail expression and phosphorylation of Smad1, Akt, and GSK3?. In addition, pretreatment with SB431542, LDN193189, or Noggin prevented Snail-induced Smad1 and Akt hyperactivation and reactivated GSK3?. Moreover, LY294002 pretreatment prevented Akt hyperactivation and reactivated GSK3? without altering Smad1 activation. These findings provide a novel mechanistic insight into the important role of Snail in NSCLC during EMT and indicate potentially useful therapeutic targets for NSCLC.

SUBMITTER: Liu CW 

PROVIDER: S-EPMC4116528 | biostudies-literature | 2014 Jun

REPOSITORIES: biostudies-literature

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Snail regulates Nanog status during the epithelial-mesenchymal transition via the Smad1/Akt/GSK3β signaling pathway in non-small-cell lung cancer.

Liu Chen-Wei CW   Li Ching-Hao CH   Peng Yi-Jen YJ   Cheng Yu-Wen YW   Chen Huei-Wen HW   Liao Po-Lin PL   Kang Jaw-Jou JJ   Yeng Mao-Hsiung MH  

Oncotarget 20140601 11


The epithelial-mesenchymal transition (EMT), a crucial step in cancer metastasis, is important in transformed cancer cells with stem cell-like properties. In this study, we established a Snail-overexpressing cell model for non-small-cell lung cancer (NSCLC) and investigated its underlying mechanism. We also identified the downstream molecular signaling pathway that contributes to the role of Snail in regulating Nanog expression. Our data shows that high levels of Snail expression correlate with  ...[more]

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