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Changes in CD44 expression during carcinogenesis of the mouse colon
Experimental and Molecular Pathology
|April 1, 1997
Summary
CD44 glycoprotein, a hyaluronic acid receptor, is overexpressed in colorectal tumors. This study in mice shows altered CD44 transcript patterns during carcinogenesis, with varied protein expression in tumors.
Area of Science:
- Molecular biology
- Cancer research
- Gastroenterology
Background:
- CD44 glycoprotein is the primary hyaluronic acid receptor.
- Alternative splicing of the CD44 gene generates diverse isoforms.
- CD44 isoform overexpression is linked to cancer progression, including colon carcinoma.
Purpose of the Study:
- Investigate CD44 expression in a murine model of colon adenoma/carcinoma.
- Define the relationship between CD44 transcript and protein expression during colorectal carcinogenesis.
- Analyze CD44 transcript and protein patterns in experimentally induced colon tumors.
Main Methods:
- Induction of colon tumors in mice using 1,2-dimethylhydrazine.
- Analysis of CD44 expression via RT-PCR/Southern blot and immunohistochemistry.
- Comparison of CD44 expression in tumor tissues versus normal colon tissue.
Main Results:
- CD44 transcripts were significantly overexpressed in tumors compared to normal colon.
- Both standard and variant CD44 isoforms were detected in neoplastic and normal colon.
- CD44 protein expression was heterogeneous in tumors, often decreasing in larger, invasive ones, contrasting with localized expression in normal colon crypt bases.
Conclusions:
- Early colorectal carcinogenesis in mice involves global overexpression of standard and variant CD44 transcripts.
- CD44 transcript levels do not directly correlate with protein expression patterns in all cases.
- CD44 expression dynamics provide insights into colorectal cancer development.