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2015 ; 29
(10
): 1074-86
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LIN28 cooperates with WNT signaling to drive invasive intestinal and colorectal
adenocarcinoma in mice and humans
#MMPMID25956904
Tu HC
; Schwitalla S
; Qian Z
; LaPier GS
; Yermalovich A
; Ku YC
; Chen SC
; Viswanathan SR
; Zhu H
; Nishihara R
; Inamura K
; Kim SA
; Morikawa T
; Mima K
; Sukawa Y
; Yang J
; Meredith G
; Fuchs CS
; Ogino S
; Daley GQ
Genes Dev
2015[May]; 29
(10
): 1074-86
PMID25956904
show ga
Colorectal cancer (CRC) remains a major contributor to cancer-related mortality.
LIN28A and LIN28B are highly related RNA-binding protein paralogs that regulate
biogenesis of let-7 microRNAs and influence development, metabolism, tissue
regeneration, and oncogenesis. Here we demonstrate that overexpression of either
LIN28 paralog cooperates with the Wnt pathway to promote invasive intestinal
adenocarcinoma in murine models. When LIN28 alone is induced genetically, half of
the resulting tumors harbor Ctnnb1 (?-catenin) mutation. When overexpressed in
Apc(Min/+) mice, LIN28 accelerates tumor formation and enhances proliferation and
invasiveness. In conditional genetic models, enforced expression of a
LIN28-resistant form of the let-7 microRNA reduces LIN28-induced tumor burden,
while silencing of LIN28 expression reduces tumor volume and increases tumor
differentiation, indicating that LIN28 contributes to tumor maintenance. We
detected aberrant expression of LIN28A and/or LIN28B in 38% of a large series of
human CRC samples (n = 595), where LIN28 expression levels were associated with
invasive tumor growth. Our late-stage CRC murine models and analysis of primary
human tumors demonstrate prominent roles for both LIN28 paralogs in promoting CRC
growth and progression and implicate the LIN28/let-7 pathway as a therapeutic
target.