Abstract
Objective and design
Patients with ulcerative colitis have increased risk of colorectal carcinoma, but little is known about how peritoneal macrophages are involved in ulcerative colitis-associated carcinogenesis. We investigated the alteration of peritoneal macrophages and M1/M2 subpopulations during ulcerative colitis-associated carcinogenesis.
Materials and methods
Expression and functional changes in peritoneal macrophages and M1/M2 subpopulations were investigated by histopathology, flow cytometry, immunofluorescence, cytokines expression by ELISA and QRT-PCR in an azoxymethane (AOM)- and dextran sodium sulfate (DSS)-induced chemical colitis-associated carcinoma mouse model using male Crj:CD-1 (ICR) mice.
Results
Striking evidence observed in histopathology, flow cytometry, cytokine detection, and gene expression analysis all revealed that inflammation-associated cytokines (IL-1β, IL-10, IL-12, IL-6, TNF-α) and migration/invasion-associated factors (G-CSF, GM-CSF, CXCR4, VEGF, TGF-β, ICAM-1) induced by peritoneal M2 macrophages increased significantly during the progression from inflammatory hyperplasia to carcinoma and metastasis. Similar functional changes occurred during peritoneal metastasis in M1 macrophages without changed polarization.
Conclusions
These results suggested that peritoneal M2 macrophages played a critical role in ulcerative colitis-associated carcinogenesis, including unbalanced pro-inflammatory and anti-inflammatory axis and enhanced expression of migration/invasion-associated factors. Furthermore, functional changes of M1 macrophages occurred without changed polarization during carcinogenesis and metastasis.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (81172300, 81272975, 81272736), Key Project of Hunan Provincial Natural Science Foundation (12JJ2044), Project of Hunan Provincial Development and Reform Commission, Hunan Provincial Innovation Foundation for Postgraduate (CX2011B073), and Mittal Student Innovation Project (11MX25). We are grateful to the members of our laboratory, Professor Songqing Fan and Lei Shi (The Second Xiangya Hospital), and technical support of Beckman Coulter and Medjaden Bioscience Limited.
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The authors have no financial or other potential conflicts of interest to declare.
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Wang, W., Li, X., Zheng, D. et al. Dynamic changes of peritoneal macrophages and subpopulations during ulcerative colitis to metastasis of colorectal carcinoma in a mouse model. Inflamm. Res. 62, 669–680 (2013). https://doi.org/10.1007/s00011-013-0619-y
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DOI: https://doi.org/10.1007/s00011-013-0619-y