Abstract
Objective
In sporadic colon tumors, multistep process of well-known genetic alterations accelerates carcinogenesis; however, this does not appear to be the case in inflammation-related ones. We previously established a model of inflammation-related colon carcinogenesis using human colonic adenoma cells, and identified fascin as a driver gene of this process. We analyzed the microRNAs involved in the stable fascin expression in colon adenocarcinoma cells.
Materials and methods
miRNA microarray analysis was performed using FPCK-1-1 adenoma cells and its-derived FPCKpP1-4 adenocarcinoma cells through chronic inflammation. To assess the involvement of miRNA in the inflammation-related carcinogenesis, sphere-forming ability, expression of colon cancer stemness markers, and stability of fascin protein via the proteasome using tough decoy RNA technique.
Results
We found that 17 miRNAs including miR-146a were upregulated and 16 miRNAs were downregulated in FPCKpP1-4 adenocarcinoma cells. We revealed that miR-146a in the adenocarcinoma cells brought about acquisition of sphere formation, cancer stemness, and inhibition of proteasomal degradation of the fascin protein.
Conclusions
We found that stable fascin expression is brought about via the inhibition of proteasome degradation by miR-146a in the process of a chronic inflammation-related colon carcinogenesis.
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Acknowledgements
We thank Drs. Toshiaki Inoue and Shunsuke Kitajima for critical advice. This work was supported in part by a Grant-in-Aid to FO from the Japanese Ministry of Education, Culture, Sports, Science and Technology (26460472 and 17K08761); the Research Grant of the Princess Takamatsu Cancer Research Fund. This work was also supported in part by a Grant-in-Aid to MO from the Takeda Science Foundation. YK was supported by the Japan Society for the Promotion of Science (15J07285, Research Fellowship for Young Scientists).
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FO designed and arranged all of the experiments; YK and KO performed experiments and data analysis; TK, MO, TO, and TK contributed to discussion of the experimental design and interpretation of the results; YK, MO, and FO wrote the manuscript.
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Supplementary Figure 1
: MiR-146a expression in pro-inflammatory cytokine-treated FPCK-1-1 cells. Levels of miR-146a were measured in FPCK-1-1 cells treated with 100 ng/mL TNF-ɑ or 10 ng/mL IL-1 β for 24 h. Bar graphs show mean ± SD (n = 5 in each group). (PDF 11 KB)
Supplementary Figure 2
. MG-132 stabilizes fascin protein in both FPCK-1-1 cells and FPCKpP1-4 cells. FPCK-1-1 and FPCKpP1-4 cells were treated with 10 µM MG-132 for 12 h and the fascin protein was detected by Western blot (top). The results were quantified and normalized to non-treated FPCK-1-1 cells (bottom). (PDF 102 KB)
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Kanda, Y., Kawaguchi, T., Osaki, M. et al. Fascin protein stabilization by miR-146a implicated in the process of a chronic inflammation-related colon carcinogenesis model. Inflamm. Res. 67, 839–846 (2018). https://doi.org/10.1007/s00011-018-1175-2
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DOI: https://doi.org/10.1007/s00011-018-1175-2