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2016 ; 7
(6
): 6626-38
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IL-6 promotes growth and epithelial-mesenchymal transition of CD133+ cells of
non-small cell lung cancer
#MMPMID26675547
Lee SO
; Yang X
; Duan S
; Tsai Y
; Strojny LR
; Keng P
; Chen Y
Oncotarget
2016[Feb]; 7
(6
): 6626-38
PMID26675547
show ga
We examined IL-6 effects on growth, epithelial-mesenchymal transition (EMT)
process, and metastatic ability of CD133+ and CD133- cell subpopulations isolated
from three non-small cell lung cancer (NSCLC) cell lines: A549, H157, and H1299.
We developed IL-6 knocked-down and scramble (sc) control cells of A549 and H157
cell lines by lentiviral infection system, isolated CD133+ and CD133-
sub-populations, and investigated the IL-6 role in self-renewal/growth of these
cells. IL-6 showed either an inhibitory or lack of effect in modulating growth of
CD133- cells depending on intracellular IL-6 levels, but there was higher
self-renewal ability of IL-6 expressing CD133+ cells than IL-6 knocked down
cells, confirming the promoter role of IL-6 in CD133+ cells growth. We then
examined tumor growth of xenografts developed from CD133+ cells of A549IL-6si vs.
A549sc cell lines. Consistently, there was retarded growth of tumors developed
from A549IL-6si, CD133+ cells compared to tumors originating from A549sc, CD133+
cells. The effect of IL-6 in promoting CD133+ self-renewal was due to hedgehog
(Hhg) and Erk signaling pathway activation and higher Bcl-2/Bcl-xL expression. We
also investigated whether IL-6 regulates the EMT process of CD133- and CD133+
cells differently. Expression of the EMT/metastasis-associated molecules in IL-6
expressing cells was higher than in IL-6 knocked down cells. Together, we
demonstrated dual roles of IL-6 in regulating growth of CD133- and CD133+
subpopulations of lung cancer cells and significant regulation of IL-6 on
EMT/metastasis increase in CD133+ cells, not in CD133- cells.