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2016 ; 7
(43
): 70924-70935
Nephropedia Template TP
gab.com Text
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English Wikipedia
DACT2 silencing by promoter CpG methylation disrupts its regulation of
epithelial-to-mesenchymal transition and cytoskeleton reorganization in breast
cancer cells
#MMPMID27708215
Xiang T
; Fan Y
; Li C
; Li L
; Ying Y
; Mu J
; Peng W
; Feng Y
; Oberst M
; Kelly K
; Ren G
; Tao Q
Oncotarget
2016[Oct]; 7
(43
): 70924-70935
PMID27708215
show ga
Wnt signaling plays an important role in breast carcinogenesis. DAPPER2 (DACT2)
functions as an inhibitor of canonical Wnt signaling and plays distinct roles in
different cell contexts, with its role in breast tumorigenesis unclear. We
investigated DACT2 expression in breast cancer cell lines and primary tumors, as
well as its functions and molecular mechanisms. Results showed that DACT2
expression was silenced in 9/9 of cell lines. Promoter CpG methylation of DACT2
was detected in 89% (8/9) of cell lines, as well as in 73% (107/147) of primary
tumors, but only in 20% (1/5) of surgical margin tissues and in none of normal
breast tissues. Demethylation of BT549 and T47D cell lines with
5-aza-2'-deoxycytidine restored DACT2 expression along with promoter
demethylation, suggesting that its downregulation in breast cancer is dependent
on promoter methylation. Furthermore, ectopic expression of DACT2 induced breast
cell apoptosis in vitro, and further inhibited breast tumor cell proliferation,
migration and EMT, through antagonizing Wnt/?-catenin and Akt/GSK-3 signaling.
Thus, these results demonstrate that DACT2 functions as a tumor suppressor for
breast cancer but was frequently disrupted epigenetically in this cancer.