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Angiogenesis in colon hyperplastic polyp
Yasushi Sano1, Naomi Maeda, Atusko Kanzaki
1Division of Gastrointestinal Endoscopy, National Cancer Center Hospital East, Chiba, Japan. tyuji@idac.tohoku.ac.jp
Cancer Letters
|January 27, 2005
Summary
Angiogenesis, or blood vessel formation, is significantly increased in large hyperplastic polyps compared to normal tissue. Thymidine phosphorylase expression in stromal cells may promote this angiogenesis, suggesting potential anti-angiogenic therapies for polyps.
Area of Science:
- Gastroenterology
- Oncology
- Pathology
Background:
- Tumor angiogenesis is crucial in colorectal carcinoma, but its role in hyperplastic polyps is unknown.
- Hyperplastic polyps are common, and understanding their development is important for clinical management.
Purpose of the Study:
- To investigate the role of angiogenesis in the development of hyperplastic polyps.
- To assess the expression of thymidine phosphorylase (dThdPase) in hyperplastic polyps and its correlation with angiogenesis.
Main Methods:
- Immunohistochemistry was used to evaluate angiogenesis via CD34 staining and thymidine phosphorylase expression.
- Intra-tumoral microvessel density (IMD) and dThdPase expression were quantified in 11 small hyperplastic polyps, 13 large hyperplastic polyps, and adjacent normal mucosa.
Main Results:
- Large hyperplastic polyps showed significantly higher IMD than small polyps and normal mucosa (P<0.01).
- Small hyperplastic polyps also exhibited significantly higher dThdPase expression than normal mucosa (P<0.01).
- Stromal cell dThdPase expression was significantly higher in large polyps compared to small polyps and normal tissue (P<0.01).
Conclusions:
- Angiogenesis likely plays a significant role in the development of hyperplastic polyps.
- Stromal cell thymidine phosphorylase may support angiogenesis in hyperplastic polyps.
- Anti-angiogenic therapy could be a potential strategy for hyperplastic polyp suppression.