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Cdk1/P34Cdc2 and P21waf expression in colorectal adenomas and carcinomas
R Egilmez1, S Elagöz, E A Kanik
1Dept. of Pathology, Faculty of Medicine, Mersin University, Turkey. hegilmez@e-kolay.net
Abstract:
p21WAF1,CIP1,SDI 1 is a specific inhibitor of cyclin-dependent kinase and a tumor suppressor involved in the pathogenesis of a variety of malignancies. Cdk1/p34cdc2 plays a crucial role during mitosis. The immunoreactivity of p21 WAF1,CIP1,SDI 1 and cdk1/p34cdc2 was evaluated in adenomas and adenocarcinomas of the human large bowel. The expression of p21WAF1,CW1,SDI 1 was detected in 5 out of 15 adenomas (33.3 %) and in 13 out of 36 adenocarcinomas (36 %). Cdk1/p34cdc2 was expressed in 11 out of 15 adenomas (73.3%) and in 18 out of 36 adenocarcinomas (50%). In conclusion, our results indicate that there is an expression of cdk1/p34cdc2 in colorectal adenomas and absence of p21 WAF1,CIP1,SDI 1 in both colorectal adenomas and carcinomas. These results suggest that the proliferative activity of colonic cancer might not be solely dependent on control of the cell cycle by p21 WAF1,CIP1,SDI Cdk1/p34cdc2 expression, in a high percentage of both adenomas and adenocarcinomas suggest that this phenomenon may be an early event in colorectal carcinogenesis.
Insights
The tumor suppressor p21 (also known as WAF1, CIP1, SDI 1) was absent in most colorectal adenomas and carcinomas. However, Cdk1/p34cdc2 was expressed in these tissues, suggesting it plays a role in early colorectal carcinogenesis.
Area of Science:
- Oncology
- Cell Biology
- Molecular Biology
Background:
- p21WAF1,CIP1,SDI 1 is a cyclin-dependent kinase inhibitor and tumor suppressor.
- Cdk1/p34cdc2 is crucial for mitosis.
- Dysregulation of these proteins is implicated in various cancers.
Purpose of the Study:
- To evaluate the expression of p21WAF1,CIP1,SDI 1 and Cdk1/p34cdc2 in human colorectal adenomas and adenocarcinomas.
- To investigate the potential role of these proteins in colorectal carcinogenesis.
Main Methods:
- Immunoreactivity assessment of p21WAF1,CIP1,SDI 1 and Cdk1/p34cdc2.
- Analysis of protein expression in 15 colorectal adenomas and 36 adenocarcinomas.
Main Results:
- p21WAF1,CIP1,SDI 1 was detected in 33.3% of adenomas and 36% of adenocarcinomas.
- Cdk1/p34cdc2 was expressed in 73.3% of adenomas and 50% of adenocarcinomas.
- Absence of p21WAF1,CIP1,SDI 1 was noted in a significant proportion of both adenomas and carcinomas.
Conclusions:
- Colorectal adenomas and adenocarcinomas express Cdk1/p34cdc2, suggesting its early involvement in colorectal carcinogenesis.
- The absence of p21WAF1,CIP1,SDI 1 indicates that cell cycle control in colonic cancer may not solely depend on this inhibitor.
- These findings highlight potential differences in cell cycle regulation pathways during colorectal tumor development.