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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 Biochim+Biophys+Acta
2015 ; 1852
(9
): 1876-86
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NDRG1 attenuates epithelial-mesenchymal transition of nasopharyngeal cancer cells
via blocking Smad2 signaling
#MMPMID26071641
Hu ZY
; Xie WB
; Yang F
; Xiao LW
; Wang XY
; Chen SY
; Li ZG
Biochim Biophys Acta
2015[Sep]; 1852
(9
): 1876-86
PMID26071641
show ga
N-myc downstream-regulated gene 1 (NDRG1) has been implicated in tumorigenesis
and metastasis in different cancers. However, its role in nasopharyngeal
carcinoma remains unknown. We found that NDRG1 expression level was high in
nasopharyngeal cancer 5-8F cells but low in 5-8F-LN cells with lymphatic
metastasis potential. Knockdown of NDRG1 by shRNA promoted 5-8F cell
proliferation, migration, and invasion in vitro and its tumorigenesis in vivo.
Moreover, NDRG1 deficiency induced an epithelial-mesenchymal transition (EMT) of
5-8F cells as shown by an attenuation of E-cadherin and an induction of
N-cadherin and vimentin expression. NDRG1 knockdown also enhanced Smad2
expression and phosphorylation. Smad2 signaling was attenuated in 5-8F cells but
was significantly activated in 5-8F-LN cells. Knockdown of Smad2 restored
E-cadherin but attenuated N-cadherin expression in NDRG1-deficient 5-8F cells,
suggesting a reduction of EMT. Consistently, blockade of Smad2 in 5-8F-LN cells
increased E-cadherin while diminishing N-cadherin and vimentin expression. These
data indicate that Smad2 mediates the NDRG1 deficiency-induced EMT of 5-8F cells.
In tumors derived from NDRG1-deficient 5-8F cells, E-cadherin expression was
inhibited while vimentin and Smad2 were increased in a large number of cancer
cells. Most importantly, NDRG1 expression was attenuated in human nasopharyngeal
carcinoma tissues, resulted in a lower survival rate in patients. The NDRG1 was
further decreased in the detached nasopharyngeal cancer cells, which was
associated with a further reduced survival rate in patients with lymphatic
metastasis. Taken together, these results demonstrated that NDRG1 prevents
nasopharyngeal tumorigenesis and metastasis via inhibiting Smad2-mediated EMT of
nasopharyngeal cells.