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Antisense wnt-5a mimics wnt-1-mediated C57MG mammary epithelial cell transformation
1Department of Surgery, Pennsylvania State University, Milton S. Hershey Medical Center, Hershey 17033, USA.
Abstract:
The disruption of the normal expression of wnt-5a in cell lines and in tumors is becoming increasingly recognized as important in cell transformation and tumorigenesis. For example, in endometrial cancer wnt-5a is downregulated compared to normal tissue. Our laboratory has recently found that the ectopic expression of wnt-5a in human RCC23 renal carcinoma cells missing wnt-5a gene expression suppresses in vitro cell growth and telomerase enzyme activity. Furthermore, ectopic wnt-5a in MC-T16 uroepithelial cancer cells missing the region of chromosome 3p where wnt-5a has been mapped reverts uroepithelial cell tumorigenesis in athymic nude mice. These studies were based upon the previous finding that wnt-1 and wnt-2 transform C57MG mammary epithelial cells by downregulating the endogenous expression of wnt-5a. We now report that transfecting C57MG cells with a mammalian expression vector carrying antisense wnt-5a results in a cell phenotype that mimics cell transformation by ectopic wnt-1 or wnt-2. Correspondingly, wnt-1-transformed cells are partially reverted in the presence of ectopic wnt-5a. We conclude from this that wnt-5a is an important regulator of cell growth and differentiation and its loss of expression leads to cell transformation.
Insights
Loss of wnt-5a expression promotes cell transformation and tumorigenesis. Restoring wnt-5a suppresses tumor growth and reverts cancerous cell phenotypes, highlighting its role in cell regulation.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Aberrant wnt-5a expression is increasingly linked to cell transformation and tumor development.
- Downregulation of wnt-5a is observed in endometrial cancer compared to normal tissues.
Purpose of the Study:
- To investigate the role of wnt-5a in cell transformation and tumorigenesis.
- To determine the effects of ectopic wnt-5a expression on cancer cell behavior.
Main Methods:
- Ectopic expression of wnt-5a in human renal carcinoma and uroepithelial cancer cell lines.
- Transfection of mammary epithelial cells with antisense wnt-5a.
- Assessment of cell growth, telomerase activity, and tumorigenesis in vivo.
Main Results:
- Ectopic wnt-5a suppressed in vitro cell growth and telomerase activity in renal carcinoma cells.
- Ectopic wnt-5a reverted tumorigenesis of uroepithelial cancer cells in mice.
- Antisense wnt-5a transfection mimicked cell transformation induced by wnt-1/wnt-2, and ectopic wnt-5a partially reverted wnt-1-transformed cells.
Conclusions:
- Wnt-5a is a critical regulator of cell growth and differentiation.
- Loss of wnt-5a expression is a key event in cell transformation and the development of cancer.