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2017 ; 19
(8
): 595-605
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Stat6 Promotes Intestinal Tumorigenesis in a Mouse Model of Adenomatous Polyposis
by Expansion of MDSCs and Inhibition of Cytotoxic CD8 Response
#MMPMID28654863
Jayakumar A
; Bothwell ALM
Neoplasia
2017[Aug]; 19
(8
): 595-605
PMID28654863
show ga
Intestinal tumorigenesis in the ApcMin/+ model is initiated by aberrant
activation of Wnt pathway. Increased IL-4 expression in human colorectal cancer
tissue and growth of colon cancer cell lines implied that IL-4-induced
Stat6-mediated tumorigenic signaling likely contributes to intestinal tumor
progression in ApcMin/+ mice. Stat6 also appears to promote expansion of
myeloid-derived suppressor cells (MDSCs) cells. MDSCs promote polyp formation in
the ApcMin/+ model. Hence, Stat6 could have a broad role in coordinating both
polyp cell proliferation and MDSC expansion. We found that IL-4-induced
Stat6-mediated proliferation of intestinal epithelial cells is augmented by
platelet-derived growth factor-BB, a tumor-promoting growth factor. To determine
whether polyp progression in ApcMin/+ mice is dependent on Stat6 signaling, we
disrupted Stat6 in this model. Total polyps in the small intestine were fewer in
ApcMin/+ mice lacking Stat6. Furthermore, proliferation of polyp epithelial cells
was reduced, indicating that Stat6 in part controlled polyp formation. Stat6 also
promoted expansion of MDSCs in the spleen and lamina propria of ApcMin/+ mice,
implying regulation of antitumor T-cell response. More CD8 cells and reduced PD-1
expression on CD4 cells correlated with reduced polyps. In addition, a strong
CD8-mediated cytotoxic response led to killing of tumor cells in Stat6-deficient
ApcMin/+ mice. Therefore, these findings show that Stat6 has an oncogenic role in
intestinal tumorigenesis by promoting polyp cell proliferation and
immunosuppressive mediators, and preventing an active cytotoxic process.