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Sialyl-tn antigen expression in Crohn's colitis
1Gastrointestinal Research Laboratory, Department of Medicine, and Departments of *Pathology and †Biomathematical Sciences, Mount Sinai School of Medicine, New York, New York, U.S.A.
Inflammatory Bowel Diseases
|January 4, 2013
Summary
Sialyl-Tn (STn) antigen expression is linked to colon cancer progression. In Crohn's colitis, STn is found in 40% of specimens, particularly in the left colon and during active inflammation, suggesting differences from ulcerative colitis.
Area of Science:
- Gastroenterology
- Oncology
- Immunohistochemistry
Background:
- The mucin-associated sialyl-Tn (STn) antigen is a known biomarker for malignant progression in colon cancer.
- Previous studies show STn expression increases in ulcerative colitis (UC) patients who develop colon cancer, often years before dysplasia detection.
Purpose of the Study:
- To systematically examine STn antigen expression in Crohn's colitis, a condition not previously studied in this context.
- To compare STn expression patterns in Crohn's colitis with those observed in UC.
Main Methods:
- Immunohistochemical staining using monoclonal antibody TKH2 was performed on 110 surgical specimens from 59 patients with Crohn's colitis or ileocolitis.
- Analysis focused on the presence and location of STn antigen expression in relation to disease characteristics.
Main Results:
- The STn antigen was expressed in 40% of Crohn's colitis specimens.
- STn expression was more prevalent in left colon specimens, irrespective of disease extent (segmental or pancolitis).
- Active inflammation was associated with increased STn expression, regardless of location or disease pattern.
Conclusions:
- STn antigen expression is a notable feature in Crohn's colitis.
- The enhanced STn expression in Crohn's colitis compared to UC may indicate distinct underlying inflammatory mechanisms and cytokine profiles.
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