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2015 ; 8
(3
): 2809-15
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CSN5 silencing inhibits invasion and arrests cell cycle progression in human
colorectal cancer SW480 and LS174T cells in vitro
#MMPMID26045788
Zhong G
; Li H
; Shan T
; Zhang N
Int J Clin Exp Pathol
2015[]; 8
(3
): 2809-15
PMID26045788
show ga
CSN5 has been implicated as a candidate oncogene in human cancers by genetic
linkage with activation of the poor-prognosis, wound response gene expression
signature. The present study aimed to investigate the effect of silencing CSN5 on
invasion and cell cycle progression of human colorectal cancer cells, and to
determine the potential molecular mechanisms that are involved. The CSN5 specific
small interfering RNA (shRNA) plasmid vector was constructed and then transfected
into colorectal cancer cells. The expression of CSN5 mRNA and protein was
detected by quantitative polymerase chain reaction and western blot analysis,
respectively. Cell adhesion and invasion were analyzed using MTS and Transwell
assays, respectively, and cell cycle progression was analyzed using flow
cytometry. Adhesion, invasion, and cell cycle distribution were assessed
following knockdown of CSN5 by RNA interference (RNAi). Furthermore, knockdown of
CSN5 significantly inhibited cell adhesion and reduced the number of invasive
cells, while increasing the percentage of cells in the G0/G1 phase (P<0.05).
Western blot and real-time PCR analysis were used to identify differentially
expressed invasion and cell cycle associated proteins in cells with silenced
CSN5. The expression levels of CSN5 in colorectal cancer cells transfected with
siRNA were decreased, leading to a significant inhibition of colorectal cancer
cell adhesion and invasion. Western blot analysis revealed that silencing of CSN5
may inhibit CD44, matrix metalloproteinase (MMP) 2 and MMP 9 protein expression,
significantly promoted cell cycle-related genes P53 and P27 expression. In
addition, CSN5 silencing may induce activation PI3K/AKT signal regulated cell
invasion. Moreover, CSN5 silencing inhibited the secretion of TGF-?, IL-1? and
IL-6 and the transcriptional activity of transcription factor NF-?B and Twist in
human colorectal cancer cells. Taken together, down regulation of CSN5 may
inhibit invasion and arrests cell cycle progression in colorectal cancer via
PI3K/AKT/NF-?B signal pathway, which indicates that there is a potential of
targeting CSN5 as a novel gene therapy approach for the treatment of colorectal
cancer.