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CAMK2? in Intestinal Epithelial Cells Modulates Colitis-Associated Colorectal Carcinogenesis via Enhancing STAT3 Activation #MMPMID28319059
Ma X; Meng Z; Jin L; Xiao Z; Wang X; Tsark WM; Ding L; Gu Y; Zhang J; Kim B; He M; Gan X; Shively JE; Yu H; Xu R; Huang W
Oncogene 2017[Jul]; 36 (28): 4060-71 PMID28319059show ga
Inflammation is one of the major risk factors for cancer. Here, we show that calcium/calmodulin-dependent protein kinase II gamma (CAMK2?) in intestinal epithelial cells (IECs) modulates inflammatory signals and promotes colitis-associated cancer (CAC) in mice. We have identified CAMK2? as a downstream target of colitis-induced WNT5a signaling. Furthermore, we have shown that CAMK2? protects against intestine tissue injury by increasing IEC survival and proliferation. CAMK2? knockout mice displayed reduced CAC. Furthermore, we used bone marrow transplantation to reveal that CAMK2? in IECs, but not immune cells, was crucial for its effect on CAC. Consistently, transgenic over-expression of CAMK2? in IECs accelerated CAC development. Mechanistically, CAMK2? in IECs enhanced epithelial STAT3 activation to promote survival and proliferation of colonic epithelial cells during CAC development. These results thus identify a new molecular mechanism mediated by CAMK2? in IECs during CAC development, thereby providing a potential new therapeutic target for CAC.