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2018 ; 12
(3
): 305-321
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gab.com Text
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English Wikipedia
TGF-? transactivates EGFR and facilitates breast cancer migration and invasion
through canonical Smad3 and ERK/Sp1 signaling pathways
#MMPMID29215776
Zhao Y
; Ma J
; Fan Y
; Wang Z
; Tian R
; Ji W
; Zhang F
; Niu R
Mol Oncol
2018[Mar]; 12
(3
): 305-321
PMID29215776
show ga
Transforming growth factor-beta (TGF-?) functions as a potent proliferation
inhibitor and apoptosis inducer in the early stages of breast cancer, yet
promotes cancer aggressiveness in the advanced stages. The dual effect of TGF-?
on cancer development is known as TGF-? paradox, and the remarkable functional
conversion of TGF-? is a pivotal and controversial phenomenon that has been
widely investigated for decades. This phenomenon may be attributed to the cross
talk between TGF-? signaling and other pathways, including EGF receptor (EGFR)
signaling during cancer progression. However, the underlying mechanism by which
TGF-? shifts its role from a tumor suppressor to a cancer promoter remains
elusive. In this study, TGF-? is positively correlated with EGFR expression in
breast cancer tissues, and a functional linkage is observed between TGF-?
signaling and EGFR transactivation in breast cancer cell lines. TGF-? promotes
the migration and invasion abilities of breast cancer cells, along with the
increase in EGFR expression. EGFR is also essential for TGF-?-induced enhancement
of these abilities of breast cancer cells. Canonical Smad3 signaling and ERK/Sp1
signaling pathways mediate TGF-?-induced EGFR upregulation. Hence, our study
provided insights into a novel mechanism by which TGF-? supports breast cancer
progression.