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Silencing the YB‐1 Gene Inhibits Cell Migration in Gastric Cancer In Vitro
Author(s) -
Guo Tian Tian,
Yu Ying Nan,
Cheong Yip George Wai,
Matsumoto Ken,
Bay Boon Huat
Publication year - 2013
Publication title -
the anatomical record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.678
H-Index - 62
eISSN - 1932-8494
pISSN - 1932-8486
DOI - 10.1002/ar.22702
Subject(s) - gene silencing , cancer cell , cancer , cancer research , biology , microbiology and biotechnology , cell culture , cell , epithelial–mesenchymal transition , gene expression , gene , metastasis , genetics
ABSTRACT The Y‐Box‐Binding Protein‐1 (YB‐1) is known to regulate the processes of transcription, translation, cellular response to drug treatment and viral infection as well as DNA repair among others. As gastric cancer is a common cancer with a high incidence in countries in Asia, we evaluated the association of YB‐1 with the malignant potential of gastric cancer cells in vitro . YB‐1 mRNA expression levels were first determined by real‐time RT‐PCR in two adherent gastric cancer cell lines ( viz ., MKN7 and NUGC3 gastric cancer cells) and a normal GES‐1 gastric epithelial cell line. Poorly differentiated NUGC3 gastric cancer cells were found to have the highest YB‐1 gene expression among the adherent cells. YB‐1 gene expression was also observed to be higher in non‐adherent SNU5 gastric cancer cells compared to more aggressive SNU16 cells. Silencing of the YB‐1 gene by siRNA in NUGC3 cells was associated with a significant reduction of the YB‐1 protein by more than 55% as verified by Western blot analysis. Down‐regulation of YB‐1 protein expression was further demonstrated qualitatively by immunocytochemistry and immunofluorescence staining. Silencing of the YB‐1 gene induced significant inhibition of cell migration in NUGC3 cells by 60% but did not influence cell invasion. Although epithelial‐mesenchymal‐transition (EMT) is known to be associated with the migratory phenotype in cancer cells, there was no change in the expression of EMT genes when YB‐1 expression was modulated. YB‐1 appears to have an integral role in cancer cell migration, a process which is important for gastric cancer metastasis. Anat Rec, 296:891–898, 2013. © 2013 Wiley Periodicals, Inc.