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2016 ; 14
(5
): 4135-4143
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miR-200c regulates crizotinib-resistant ALK-positive lung cancer cells by
reversing epithelial-mesenchymal transition via targeting ZEB1
#MMPMID27666124
Gao HX
; Yan L
; Li C
; Zhao LM
; Liu W
Mol Med Rep
2016[Nov]; 14
(5
): 4135-4143
PMID27666124
show ga
Crizotinib is an orally administered drug for the treatment of patients with
anaplastic lymphoma kinase (ALK)-positive locally advanced or metastatic
non?small cell lung cancer (NSCLC). Despite the impressive efficacy of crizotinib
in the treatment of ALK?positive lung cancer, acquired resistance eventually
develops in the majority of patients. The microRNA (miR)?200c reverses the
resistance of lung cancer cells to various chemotherapeutic drugs and molecular
targeted drugs, however, whether it can reverse the resistance of crizotinib
remains unknown. The present study established a crizotinib resistant cell line
(NCI?2228/CRI), which was derived from the parental NCI?2228 cell line by
long?term exposure to increasing concentrations of crizotinib. Through
overexpression and suppression of miR?200c expression, the characteristics
associated with epithelial?mesenchymal transition (EMT), including morphology,
EMT marker proteins and cellular mobility, were investigated. Cell viability and
invasion assays demonstrated that high expression of miR?200c significantly
inhibited the proliferation, migration and invasion of NCI?2228 cells compared
with the negative control. A luciferase reporter assay indicated that miR?200c
directly targeted the 3'?untranslated region of zinc finger E?box binding
homeobox 1. Additionally, reverse transcription?quantitative polymerase chain
reaction analysis demonstrated that the mRNA levels of N?cadherin and Vimentin
were decreased in NCI?2228 cells transfected with miR?200c mimic compared with
negative control cells, whereas the mRNA level of E?cadherin was increased. In
addition, EMT was reversed by miR?200c, which suggests that miR?200c may serve a
role in mediating the sensitivity of NCI?2228/CRI cells to crizotinib. The
present study may therefore contribute to improving the sensitivity of ALK
positive lung cancer cells to crizotinib.