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Down-regulation of matrix Gla protein messenger RNA in human colorectal adenocarcinomas
1Division of Colon and Rectal Surgery, Chang Gung Memorial Hospital, Taipei, Taiwan.
Abstract:
Matrix Gla protein (MGP) is a vitamin K-dependent extracellular matrix protein commonly found in a variety of tissues. In this study, we describe the potential use of MGP gene expression as the tumor marker of colorectal cancer. A decrease in expression of the MGP gene was also discovered in colorectal cancer using differential screening of cDNA libraries. The MGP expression in 80 human colorectal adenocarcinomas was quantified by a Northern blot analysis to better define the expression pattern of MGP in colorectal cancer. The expression of MGP mRNA was reduced in 63 of 80 (79%) colorectal adenocarcinomas (P<0.001) as compared to the mRNA in adjacent normal tissue, implying that a decrease in MGP expression is associated with colorectal cancer development. The proportion of tumors with downregulated expression of MGP was lower in Duke's A/B than Duke's C/D (34 of 47 versus 26 of 33, respectively) tumors and was lower in moderate differentiation than poor differentiation (44 of 64 versus 16 of 16, respectively). However, chi(2) analysis does not reveal any correlation between a loss of MGP expression and tumor progression or differentiation state. In conclusion, the downregulation of MGP mRNA generally occurs in colorectal adenocarcinomas. Although the role of MGP in cancer development is unknown, the reduced expression of MGP may be used to distinguish the normal colorectal cells from malignant cells.
Insights
Matrix Gla protein (MGP) gene expression is significantly reduced in most colorectal cancers. This downregulation of MGP may serve as a potential biomarker to differentiate normal from cancerous colorectal cells.
Area of Science:
- Biochemistry
- Oncology
- Molecular Biology
Background:
- Matrix Gla protein (MGP) is a vitamin K-dependent extracellular matrix protein present in various tissues.
- MGP's role in cancer, particularly colorectal cancer, requires further investigation.
Purpose of the Study:
- To investigate the potential of MGP gene expression as a tumor marker for colorectal cancer.
- To quantify MGP expression patterns in human colorectal adenocarcinomas.
Main Methods:
- Differential screening of cDNA libraries to identify MGP gene expression changes.
- Northern blot analysis to quantify MGP mRNA levels in 80 colorectal adenocarcinomas and adjacent normal tissues.
Main Results:
- MGP mRNA expression was reduced in 79% of colorectal adenocarcinomas compared to normal tissue (P<0.001).
- Downregulation of MGP was observed in both early (Duke's A/B) and advanced (Duke's C/D) stage tumors.
- No significant correlation was found between MGP loss and tumor progression or differentiation state.
Conclusions:
- MGP mRNA downregulation is a common event in colorectal adenocarcinomas.
- Reduced MGP expression shows potential as a distinguishing factor between normal and malignant colorectal cells.
- The precise role of MGP in colorectal cancer development remains to be elucidated.