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2015 ; 6
(4
): e1708
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Negative feedback loop between p66Shc and ZEB1 regulates fibrotic EMT response in
lung cancer cells
#MMPMID25837484
Li X
; Gao D
; Wang H
; Li X
; Yang J
; Yan X
; Liu Z
; Ma Z
Cell Death Dis
2015[Apr]; 6
(4
): e1708
PMID25837484
show ga
The epithelial-to-mesenchymal transition (EMT) program is crucial for the
epithelial cancer progression and fibrotic diseases. Our previous work has
demonstrated that p66Shc, a focal adhesion-associated adaptor protein, is
frequently downregulated in lung cancers and its depletion promotes metastasis
behavior through anoikis resistance. However, mechanism underlying loss of p66Shc
and EMT response is not fully understood. Here, we showed that p66Shc deficiency
enhanced the expression of ZEB1, the known mesenchymal transcription factor and
consequently increased Vimentin, and decreased epithelial markers of E-cadherin
and ?-catenin. p66Shc depletion also increased cell invasion and migration. In
addition, ChIP and luciferase assays showed that these effects were directly
mediated by ZEB1 repression of p66Shc promoter. Thus, our findings define a
critical role of p66Shc in the suppression of fibrotic EMT response with a
negative feedback loop between p66Shc and ZEB1 in lung epithelial cancer cells.