Abstract
The ulcer-associated cell lineage (UACL) induced at the site of ileac chronic ulceration in Crohn’s disease has been reported to show histological differentiation resembling gastric pyloric mucosa. To clarify the significance of homeobox gene-encoded transcription factors in the formation of the UACL in Crohn’s disease, we investigated the immunohistochemical expression of gastrointestinal mucins (MUC5AC for gastric surface mucous cells; MUC6 for gastric gland mucous cells, and MUC2 for intestinal goblet cells) and homeobox gene-encoded transcription factors (CDX-2 for intestinal mucosa and PDX-1 for pyloric mucosa) in the UACL. The analysis was undertaken on ileal mucosa obtained from ileal resections performed in 19 patients with active Crohn’s disease of the small bowel. The UACL was observed in nine patients. In the UACL, expression of mucous cells with a foveolar-structure showed immunoreactivity to MUC5AC, and the mucous cells with a glandular structure showed immunoreactivity to MUC6, and the expression of MUC2 was decreased. In addition, we detected the decreased expression of CDX-2 along with the increased expression of PDX-1 in the UACL. The UACL showed histological differentiation simulating gastric pylori mucosa. The down-regulation of CDX-2 and the up-regulation of PDX-1 could be an important mechanism in the induction of the UACL.
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Acknowledgments
We gratefully thank Professor Christopher V. E. Wright (Vanderbilt Developmental Biology Program, Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN, USA) for the gift of critical antibody reagent, Professor Tsutomu Katsuyama (Department of Laboratory Medicine, Shinshu University School of Medicine) and Professor Kendo Kiyosawa (Second Department of Internal Medicine, Shinshu University School of Medicine) for their advice and encouragement.
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Kaneko, Y., Nakamura, T., Hayama, M. et al. Altered expression of CDX-2, PDX-1 and mucin core proteins in “Ulcer-associated cell lineage (UACL)” in Crohn’s disease. J Mol Hist 39, 161–168 (2008). https://doi.org/10.1007/s10735-007-9149-7
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DOI: https://doi.org/10.1007/s10735-007-9149-7