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- W2035654754 abstract "Epithelial cells affected by somatic mutations undergo transition from a tumour-suppressive to a carcinogenic Smad pathway during sporadic colorectal carcinogenesis, and the specific linker threonine phosphorylation of Smad2/3 in colon epithelial cells indicates stem-like cells. This study extends previous observations to a model of colitis-associated colorectal cancer.After Crl:CD-1 mice received an administration of azoxymethane [AOM], the mice were given dextran sodium sulfate [DSS] for 7 days. AOM/DSS-treated mice [AOM/DSS mice] were killed at 10 or 20 weeks. After macroscopic observations, a histopathological analysis was conducted. Immunohistochemical staining was performed using the avidin-biotin immunoperoxidase method [pSmad3C-Ser, pSmad3L-Ser, c-Myc] and immunofluorescent methods [Ki67, β-catenin, CDK4, cyclin D1, Sox9, pSmad2/3L-Thr].The colons from AOM/DSS mice were shorter than those from control mice. The number of colon tumours at Week 20 was higher than at Week 10. The inflammation scores for AOM/DSS mice were greater than those for control mice. Immunostaining-positive cells (staining by Ki67, β-catenin [nuclear and cytoplasmic], cyclin D1, and Sox9) were diffusely distributed in colon tumours. The percentage of pSmad3L-Ser-positive cells in colon tumours was higher than in sites of pre-neoplastic colitis, and that in sites of pre-neoplastic colitis was higher than in control mice. pSmad2/3L-Thr-positive cells were sparsely detected around crypt bases in non-neoplastic colon epithelia and at the tops of tumours, and immunohistochemical co-localisation of pSmad2/3L-Thr with Ki67 was not observed. Immunohistochemical co-localisation of pSmad2/3L-Thr with β-catenin and CDK4 was observed.pSmad3L-Ser signalling is an early event in colitis-associated colorectal cancer, and pSmad2/3L-Thr immunostaining-positive cells might be cancer stem cells." @default.
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- W2035654754 date "2015-04-23" @default.
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- W2035654754 title "Smad2/3 Linker Phosphorylation Is a Possible Marker of Cancer Stem Cells and Correlates with Carcinogenesis in a Mouse Model of Colitis-Associated Colorectal Cancer" @default.
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- W2035654754 doi "https://doi.org/10.1093/ecco-jcc/jjv073" @default.
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