Thymosin ß4 expression in colorectal polyps and adenomas

Area of Science:

• Gastroenterology
• Oncology
• Molecular Biology

Background:

• Thymosin beta 4 (Tβ4) is a peptide involved in cytoskeletal regulation and cell differentiation.
• Emerging evidence suggests Tβ4 plays a role in experimental and human carcinogenesis, including gastrointestinal cancers.

Purpose of the Study:

• To investigate the relationship between Tβ4 immunoreactivity and the early stages of colorectal carcinogenesis.
• To analyze Tβ4 expression patterns in various pre-cancerous and cancerous colorectal lesions.

Main Methods:

• Immunohistochemistry was used to analyze Tβ4 expression in 60 intestinal biopsy samples.
• Samples included normal colon mucosa, hyperplastic polyps, sessile serrated adenomas/polyps, low-grade and high-grade dysplastic adenomas, and adenocarcinomas.

Main Results:

• Tβ4 was not detected in hyperplastic or sessile serrated polyps.
• Tβ4 expression was observed in 10/15 colorectal adenocarcinomas.
• Immunoreactivity shifted from spot-like perinuclear staining in low-grade dysplasia to diffuse cytoplasmic staining in high-grade dysplasia and adenocarcinoma.

Conclusions:

• Tβ4 expression is present during different stages of colon carcinogenesis.
• The changing localization of Tβ4 suggests a potential role in colorectal cancer progression.
• The precise function of Tβ4 in dysplastic intestinal epithelium remains to be elucidated.