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• W2024397783 abstract "The role of aberrant crypt foci (ACF) as preneoplastic lesions in colon carcinogenesis is not clear. In Min/+ mice and their wild-type littermates treated with azoxymethane (AOM), we previously identified a subgroup of flat ACF that seem more immediate precursors of tumors than the classical elevated ACF. In the present study, we identified a similar subgroup of flat ACF in AOM-treated A/J mice and compared them with nascent tumors and classical elevated ACF. At week 1 and 2 after birth, A/J mice were injected subcutaneously with AOM (10 mg/kg bw/injection). At weeks 7-14, we examined the luminal surface of unsectioned colon preparations stained with methylene blue in the inverse light microscope. The lesions were also examined by histopathology and immunohistochemistry. Surface examination revealed flat ACF, classical elevated ACF and nascent tumors. Since flat ACF were not observed as elevated structures, their bright blue appearance and compressed pit pattern of crypt openings seen with transillumination were used as criteria for their identification. Flat ACF and nascent tumors displayed a uniform picture of severe dysplasia, compressed pit pattern, overexpression of cytoplasmic/nuclear beta-catenin and nuclear overexpression of cyclin D1. Apparently, flat ACF and tumors represented the same type of dysplastic lesions at different stages of crypt multiplication. In contrast, classical elevated ACF did not seem to be as clearly related to tumorigenesis. They infrequently (1/20) possessed severe dysplasia, overexpression of cytoplasmic/nuclear beta-catenin, or nuclear overexpression of cyclin D1, and they did not have compressed crypt openings. Furthermore, flat ACF grew significantly faster than classical elevated ACF. In conclusion, our data indicate a development from flat ACF to adenoma characterized by aberrant activation of the Wnt signaling pathway and fast crypt multiplication. Classical elevated ACF do not seem to be as closely related to tumorigenesis." @default.
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• W2024397783 date "2005-11-29" @default.
• W2024397783 modified "2023-10-09" @default.
• W2024397783 title "Identification of flat dysplastic aberrant crypt foci in the colon of azoxymethane-treated A/J mice" @default.
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• W2024397783 doi "https://doi.org/10.1002/ijc.21416" @default.
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