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2017 ; 13
(5
): 3039-3045
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Reduced RKIP expression levels are associated with frequent non-small cell lung
cancer metastasis and STAT3 phosphorylation and activation
#MMPMID28521411
Wang A
; Duan G
; Zhao C
; Gao Y
; Liu X
; Wang Z
; Li W
; Wang K
; Wang W
Oncol Lett
2017[May]; 13
(5
): 3039-3045
PMID28521411
show ga
The current study examined the role of Raf kinase inhibitor protein (RKIP) in
non-small cell lung cancer (NSCLC) metastasis. A total of 100 patients with NSCLC
were recruited following pathological diagnosis in the First Affiliated Hospital
of Bengbu Medical College. The patients were classified and statistically
analyzed according to their clinicopathological characteristics and
tumor-node-metastasis stage. Paired tumor tissue and adjacent non-tumor tissue
samples were subject to pathological diagnosis and western blot analysis.
Transient transfection and lentivirus particle vector-mediated RKIP
overexpression, small interfering RNA-mediated silencing, Transwell assays and
immunocytochemistry methods were employed to elucidate the role and underlying
mechanisms of RKIP and the Janus kinase/signal transducer and activator of
transcription (JAK/STAT) signaling pathway in NSCLC metastasis. Furthermore, in
order to examine the in vivo effects of RKIP, recombinant lentivirus particles
containing the RKIP gene were administrated in a mouse NSCLC tumor model via tail
vein injection. The results revealed reduced RKIP expression levels in NSCLC
tissue compared with corresponding non-cancer tissue. Additionally, RKIP
expression levels were inversely associated with NSCLC intra-lung, lymph node and
long-distance metastasis. The results also indicated that RKIP was able to block
STAT3 activation via phosphorylation and inhibit NSCLC-cell metastasis in vitro.
Furthermore, RKIP knockdown was able to promote STAT3 phosphorylation and cell
metastasis in NSCLC cell lines. During in vivo experiments, RKIP overexpression
was able to suppress xenograft tumor metastasis in nude mice. Therefore, RKIP may
be an important factor in cancer cell metastasis in patients with NSCLC, and RKIP
may inhibit NSCLC-cell invasion by blocking the activation of the JAK/STAT3
signaling pathway.