Abstract
Intestinal injury or chronic inflammation induce cytokines that promote crypt regeneration and mucosal repair. If excessive or prolonged, such mechanisms may increase colon cancer risk. Factors that terminate or limit cytokine action in intestinal epithelial cells (IEC) may protect against crypt hyperplasia and neoplasia. We hypothesized that suppressor of cytokine signaling-3 (SOCS3) is such a factor. Mice with Vilin-promoter/Cre-recombinase (VC)-mediated IEC-specific SOCS3 gene disruption (VC/HO), WT/HO littermates with floxed but intact SOCS3 genes and VC/WT mice were studied. Colon was examined after acute dextran sodium sulfate (DSS)-induced mucosal injury or after azoxymethane (AOM) and chronic DSS. Signaling pathways were examined in colon, cultured IEC or colon cancer cell lines. VC/HO mice showed no basal phenotype. After acute DSS, VC/HO exhibited enhanced crypt proliferation and crypt hyperplasia and reduced transforming growth factor (TGF) β expression in colon. Inflammation and mucosal damage were similar across genotypes. Following AOM/DSS, VC/HO mice had increased size, number and load of colonic tumors and increased STAT3 and nuclear factor-kappa B (NF-κB) activation in colon. In vitro, SOCS3 overexpression reduced proliferation, IL-6-mediated STAT3 activation and tumor necrosis factor (TNF) α-mediated NF-κB activation. We conclude that cytokine induction of SOCS3 normally provides an intrinsic mechanism to limit injury-induced crypt hyperproliferation and inflammation-associated colon cancer by regulating both STAT3 and NF-κB pathways.
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Acknowledgements
We thank Kirk McNaughton for assistance with histology and immunohistochemistry, Dr Daniel Meechan for help with real-time PCR, Victoria Newton for assistance with BrdU cell counting and Eileen Hoyt for guidance with EMSA assays. This work was supported by a senior research award and post-doctoral fellowship from the Crohns' and Colitis foundation of America. Gene therapy and imaging core facilities of the Center for Gastrointestinal Biology and Disease (#P30 DK34987) assisted this work. We thank Dr Richard Furlanetto and Dr Robert Coffrey for provision of plasmids and cells.
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Rigby, R., Simmons, J., Greenhalgh, C. et al. Suppressor of cytokine signaling 3 (SOCS3) limits damage-induced crypt hyper-proliferation and inflammation-associated tumorigenesis in the colon. Oncogene 26, 4833–4841 (2007). https://doi.org/10.1038/sj.onc.1210286
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DOI: https://doi.org/10.1038/sj.onc.1210286
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