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2015 ; 12
(2
): 244-57
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CCL2 Promotes Colorectal Carcinogenesis by Enhancing Polymorphonuclear
Myeloid-Derived Suppressor Cell Population and Function
#MMPMID26146082
Chun E
; Lavoie S
; Michaud M
; Gallini CA
; Kim J
; Soucy G
; Odze R
; Glickman JN
; Garrett WS
Cell Rep
2015[Jul]; 12
(2
): 244-57
PMID26146082
show ga
Our study reveals a non-canonical role for CCL2 in modulating non-macrophage,
myeloid-derived suppressor cells (MDSCs) and shaping a tumor-permissive
microenvironment during colon cancer development. We found that intratumoral CCL2
levels increased in patients with colitis-associated colorectal cancer (CRC),
adenocarcinomas, and adenomas. Deletion of CCL2 blocked progression from
dysplasia to adenocarcinoma and reduced the number of colonic MDSCs in a
spontaneous mouse model of colitis-associated CRC. In a transplantable mouse
model of adenocarcinoma and an APC-driven adenoma model, CCL2 fostered MDSC
accumulation in evolving colonic tumors and enhanced polymorphonuclear (PMN)-MDSC
immunosuppressive features. Mechanistically, CCL2 regulated T cell suppression of
PMN-MDSCs in a STAT3-mediated manner. Furthermore, CCL2 neutralization decreased
tumor numbers and MDSC accumulation and function. Collectively, our experiments
support that perturbing CCL2 and targeting MDSCs may afford therapeutic
opportunities for colon cancer interception and prevention.