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Altered proteoglycan gene expression and the tumor stroma
1Department of Pathology and Cell Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107.
EXS
|January 1, 1994
Summary
Tumor stroma changes, particularly elevated chondroitin sulfate proteoglycan like decorin, are linked to colon cancer progression. These alterations, controlled by cancer cells, influence tumor growth and invasion.
Area of Science:
- Oncology
- Molecular Biology
- Biochemistry
Background:
- Tumor stroma, associated with epithelial neoplasms, undergoes significant proteoglycan alterations.
- These changes in tumor stroma may promote tumor progression, invasion, and growth.
Purpose of the Study:
- Investigate the role of altered proteoglycan gene expression in tumor stroma.
- Focus on chondroitin sulfate proteoglycan and decorin in colon cancer development and progression.
Main Methods:
- Analysis of proteoglycan content in human colon cancer stroma.
- In vitro studies using tumor metabolites and co-cultures.
- Gene expression analysis (mRNA levels) and DNA methylation studies of decorin.
Main Results:
- Colon cancer stroma shows enrichment in chondroitin sulfate, produced by stromal cells.
- Decorin levels and mRNA are elevated in colon carcinoma stroma, associated with gene hypomethylation.
- Decorin gene structure reveals complex alternative splicing and a TGF-beta-negative regulatory element.
Conclusions:
- Neoplastic cells likely control tumor stroma generation through a feedback loop involving proteoglycan expression.
- Altered decorin expression and gene regulation are implicated in colon cancer progression.
- Understanding these mechanisms may offer therapeutic targets for cancer treatment.