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2015 ; 106
(6
): 718-725
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Persistent activation of STAT3 by PIM2-driven positive feedback loop for
epithelial-mesenchymal transition in breast cancer
#MMPMID25854938
Uddin N
; Kim RK
; Yoo KC
; Kim YH
; Cui YH
; Kim IG
; Suh Y
; Lee SJ
Cancer Sci
2015[Jun]; 106
(6
): 718-725
PMID25854938
show ga
Metastasis of breast cancer is promoted by epithelial-mesenchymal transition
(EMT). Emerging evidence suggests that STAT3 is a critical signaling node in EMT
and is constitutively activated in many carcinomas, including breast cancer.
However, its signaling mechanisms underlying persistent activation of STAT3
associated with EMT remain obscure. Here, we report that PIM2 promotes activation
of STAT3 through induction of cytokines. Activation of STAT3 caused an increase
in PIM2 expression, implicating a positive feedback loop between PIM2 and STAT3.
In agreement, targeting of either PIM2, STAT3 or PIM2-dependent cytokines
suppressed EMT-associated migratory and invasive properties through inhibition of
ZEB1. Taken together, our findings identify the signaling mechanisms underlying
the persistent activation of STAT3 and the oncogenic role of PIM2 in EMT in
breast cancer.