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2016 ; 7
(6
): 7307-17
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IL-32? inhibits stemness and epithelial-mesenchymal transition of cancer stem
cells via the STAT3 pathway in colon cancer
#MMPMID26824417
Bak Y
; Kwon T
; Bak IS
; Hong J
; Yu DY
; Yoon DY
Oncotarget
2016[Feb]; 7
(6
): 7307-17
PMID26824417
show ga
Interleukin (IL)-32 is a well-known cytokine associated with inflammation, virus
infections and cancer. IL-32? is a newly identified isoform of IL-32, whose
function has yet to be elucidated. In this study, we investigated IL-32? function
in colon cancer stem cells. Using samples from colon cancer patients, we found
that the expression of IL-32? mRNAs was significantly suppressed in tumor
regions. We investigated the effects of IL-32? on colon cancer. Ectopic
expression of IL-32? attenuated invasion, migration in vitro and in vivo
tumorigenicity of colon cancer cells. IL-32? inhibited epithelial-mesenchymal
transition (EMT), resulting in the suppression of their migratory and invasive
capabilities of HT29 colon cancer cells. In addition, IL-32? altered various
properties of CSCs, including sphere formation and expression of stemness related
genes. IL-32? directly bound to STAT3 and inhibited its nuclear translocation,
leading to inhibited transcription of downstream factors, including Bmi1 and
ZEB1. We showed that IL-32? inhibited the STAT3-ZEB1 pathway and consequently
inhibited key factors of stemness and EMT. Taken together, our findings reveal
that IL-32? can be a tumor suppressor, indicating that IL-32? could possibly be
used in therapies for colon cancer.