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2016 ; 6
(ä): 28299
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TCF7L1 Modulates Colorectal Cancer Growth by Inhibiting Expression of the
Tumor-Suppressor Gene EPHB3
#MMPMID27333864
Murphy M
; Chatterjee SS
; Jain S
; Katari M
; DasGupta R
Sci Rep
2016[Jun]; 6
(ä): 28299
PMID27333864
show ga
Dysregulation of the Wnt pathway leading to accumulation of ?-catenin (CTNNB1) is
a hallmark of colorectal cancer (CRC). Nuclear CTNNB1 acts as a transcriptional
coactivator with TCF/LEF transcription factors, promoting expression of a broad
set of target genes, some of which promote tumor growth. However, it remains
poorly understood how CTNNB1 interacts with different transcription factors in
different contexts to promote different outcomes. While some CTNNB1 target genes
are oncogenic, others regulate differentiation. Here, we found that TCF7L1, a Wnt
pathway repressor, buffers CTNNB1/TCF target gene expression to promote CRC
growth. Loss of TCF7L1 impaired growth and colony formation of HCT116 CRC cells
and reduced tumor growth in a mouse xenograft model. We identified a group of
CTNNB1/TCF target genes that are activated in the absence of TCF7L1, including
EPHB3, a marker of Paneth cell differentiation that has also been implicated as a
tumor suppressor in CRC. Knockdown of EPHB3 partially restores growth and normal
cell cycle progression of TCF7L1-Null cells. These findings suggest that while
CTNNB1 accumulation is critical for CRC progression, activation of specific Wnt
target genes in certain contexts may in fact inhibit tumor growth.