Abstract
Background
Milk fat globule-epidermal growth factor 8 (MFG-E8) promotes phagocytic clearance of apoptotic cells to maintain normal tissue homeostasis. However, its functions in intestinal inflammation and carcinogenesis are unknown.
Methods
Experimental colitis was induced in MFG-E8 knockout (KO) and wild-type (WT) mice by dextran sodium sulfate (DSS) administration. Colon tissues were used for assessments of colitis activity and epithelial proliferation. A mouse colitis-associated cancer (CAC) model was induced by intraperitoneal injection of azoxymethane (AOM) and then the animals were given a single administration of DSS. A sporadic colon cancer model was established by repeated intraperitoneal injections of AOM. The role of MFG-E8 in epithelial proliferation with or without treatment of siRNA targeting αv-integrin was examined in vitro using a WST-1 assay.
Results
The severity of colitis in KO mice was greater than that in WT mice, while the proliferative potential of colonic epithelial cells in KO mice was lower during the regenerative phase. In both CAC and sporadic models, tumor size in KO was lower as compared to WT mice, while decreased tumor incidence was only found in the CAC model. In vitro findings showed that MFG-E8 promotes epithelial cell proliferation, and treatment with a siRNA targeting αv-integrin reduced the proliferation of Colon-26 cells stimulated with recombinant MFG-E8.
Conclusions
MFG-E8 promotes tumor growth regardless of the presence or absence of colonic inflammation, whereas colon tumor development is initiated by MFG-E8 under inflammatory conditions. These MFG-E8 functions may be dependent on integrin-mediated cellular signaling.
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Conflict of interest
Kinoshita Y, Kusunoki R, Ishihara S, Oka A, Sonoyama H, Tada Y, Fukuba N, Oshima N, Moriyama I, Yuki T, and Kawashima K received research grants from Daiichi-Sankyo Pharm, Takeda Pharm, Astellas Pharm, AstraZeneca KK, Mitsubishi Tanabe Pharm and Eisai Pharm. Kinoshita Y received honoraria for lecture fees from Daiichi-Sankyo Pharm, Takeda Pharm, Astellas Pharm, AstraZeneca KK, and Eisai Pharm.
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535_2014_1036_MOESM2_ESM.tif
Supplementary material 2 Supplemental Figure 1. Colon epithelial cell proliferation was lower in MFG-E8 KO mice as compared to WT mice. a Representative images showing ki67 staining in histological sections during recovery phase of DSS colitis (3 weeks). b Average number of ki67-positive cells per colon crypt (3 weeks, blank bar WT, black bar KO) (WT, n = 4; KO, n = 4. *p < 0.05 vs. WT) (TIFF 2025 kb)
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Kusunoki, R., Ishihara, S., Tada, Y. et al. Role of milk fat globule-epidermal growth factor 8 in colonic inflammation and carcinogenesis. J Gastroenterol 50, 862–875 (2015). https://doi.org/10.1007/s00535-014-1036-x
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DOI: https://doi.org/10.1007/s00535-014-1036-x