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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Cancer+Res
2015 ; 5
(3
): 1169-79
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Interleukin-17-induced EMT promotes lung cancer cell migration and invasion via
NF-?B/ZEB1 signal pathway
#MMPMID26045995
Gu K
; Li MM
; Shen J
; Liu F
; Cao JY
; Jin S
; Yu Y
Am J Cancer Res
2015[]; 5
(3
): 1169-79
PMID26045995
show ga
Inflammatory cytokine interleukin-17 (IL-17) has been associated with the risk of
progressive cancers including lung cancer. However, it remains unclear how IL-17
may contribute to the invasion and development of these inflammation-associated
malignancies. Here we aimed to investigate the role of IL-17 in lung cancer cell
development. Epithelial-mesenchymal transition (EMT) has been recently proposed
as a developmental process which plays an important role in cancer progression
and metastases. Here we show that IL-17 might promote EMT in lung cancer cells by
inducing the transcriptional repressor ZEB1. Exposure to IL-17 upregulated the
signature EMT phenotypic markers vimentin and E-cadherin in lung cancer cells,
and compared with controls, increased cell migration was observed in
IL-17-treated lung cancer cells. ZEB1 mRNA and protein expression was induced by
IL-17, and IL-17 stimulated nuclear localization of phosphorylated ZEB1.
Conversely, suppressing ZEB1 expression by ZEB1 siRNA abrogated IL-17-stimulated
vimentin expression and cell migration. Moreover, the phosphorylation of I?B? was
required for IL-17-induced expression of ZEB1, suggesting the involvement of
canonical NF-?B signaling. To check this hypothesis, we used IKK inhibitor BAY
11-7028 to block NF-?B activity. We found that BAY 11-7028 abrogated
IL-17-induced ZEB1 expression, cell migration, and EMT, thus confirming that
NF-?B is required for IL-17 to induce these aggressive phenotypes in lung cancer
cells. Taken together, our data support the idea that IL-17-induced EMT promotes
lung cancer cell migration and invasion via NF-?B-mediated upregulation of ZEB1.
This study reveals a new signaling axis through which the tumor microenvironment
causes ZEB1 expression to promote cancer metastasis. We suggest that targeting
IL-17-induced ZEB1 expression may offer an effective therapeutic strategy for
lung cancer treatment.