Abstract
The serrated polyp-neoplasia pathway is a novel concept that has been demonstrated to differ from the conventional adenoma-carcinoma pathway. To characterize the phenotypic patterns of differentiation in colorectal serrated polyps, we examined the immunohistochemical expression profile of gastric (MUC5AC, TFF1, MUC6, GlcNAcα1 → 4Gal → R, and PDX1) and intestinal (MUC2, TFF3, and CDX2) epithelial markers in 15 hyperplastic polyps (HPs), 29 sessile serrated adenomas (SSAs),12 traditional serrated adenomas (TSAs), and 16 conventional adenomas (CAs). MUC5AC and TFF1 were upregulated in the HPs, SSAs, and TSAs. MUC6 was expressed in the HPs and SSAs. GlcNAcα1 → 4Gal → R was expressed only in the SSAs. Although MUC2 expression was preserved, TFF3 was downregulated in the HPs, SSAs, and TSAs. PDX1 was upregulated in the HPs, SSAs, and TSAs. On the other hand, CDX2 was downregulated in the HPs and SSAs. The colorectal serrated polyps showed higher expression of gastric makers than CAs. The HPs and SSAs showed gastric and intestinal mixed phenotype expression with gastric pyloric organoid differentiation and almost identical, but different from the TSAs, marker profile. PDX1 up-regulation and CDX2 down-regulation could be important for the induction of a gastric pyloric pattern of cell differentiation in colorectal serrated polyps.
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Acknowledgments
We gratefully thank Professor Tsutomu Katsuyama (Department of Laboratory Medicine, Shinshu University School of Medicine) for his advice and encouragement, and Fujie Miyazawa, Reiko Horiuchi, and Hiroko Kobayashi (Maruko Central Hospital) for their excellent technical assistance.
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Mochizuka, A., Uehara, T., Nakamura, T. et al. Hyperplastic polyps and sessile serrated ‘adenomas’ of the colon and rectum display gastric pyloric differentiation. Histochem Cell Biol 128, 445–455 (2007). https://doi.org/10.1007/s00418-007-0326-2
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DOI: https://doi.org/10.1007/s00418-007-0326-2