Abstract
The T cell factor 4 (Tcf-4) interacts with β-catenin in the Wnt signalling pathway and coactivates downstream target genes in diverse systems including the breast. This activity is important during normal development but its deregulation plays a pivotal role in cancer progression. In a rat model for breast cancer it has been shown that metastasis-inducing DNA (Met-DNA) sequesters the endogenous inhibitory Tcf-4 and thereby promotes transcription of the secreted extracellular matrix glycophosphoprotein, osteopontin, the direct effector of metastasis in this model system. Permanent transfection of the benign rat mammary cell line with a fragment from the Met-DNA containing the Tcf recognition sequence CAAAG induces the cells to metastasize in syngeneic rats in vivo. Tcf-4 expression in human breast carcinomas is inversely associated with osteopontin protein levels. High Tcf-4 expression impedes both OPN promoter activity and protein expression in rat mammary carcinoma cells. Understanding the role of Tcf-4 in cancer development and its transcription regulation should lay the foundation for novel therapeutic approaches in the future.
Keywords: Tcf-4, Tcf/Lef, osteopontin, Wnt signalling, target genes, cancer, metastasis, therapeutic targets, review
Current Molecular Medicine
Title: The Role of LEF/TCF Factors in Neoplastic Transformation
Volume: 8 Issue: 1
Author(s): Mohamed K. El-Tanani, Amod Ravindranath, Angeline O'Connell and Patrick G. Johnston
Affiliation:
Keywords: Tcf-4, Tcf/Lef, osteopontin, Wnt signalling, target genes, cancer, metastasis, therapeutic targets, review
Abstract: The T cell factor 4 (Tcf-4) interacts with β-catenin in the Wnt signalling pathway and coactivates downstream target genes in diverse systems including the breast. This activity is important during normal development but its deregulation plays a pivotal role in cancer progression. In a rat model for breast cancer it has been shown that metastasis-inducing DNA (Met-DNA) sequesters the endogenous inhibitory Tcf-4 and thereby promotes transcription of the secreted extracellular matrix glycophosphoprotein, osteopontin, the direct effector of metastasis in this model system. Permanent transfection of the benign rat mammary cell line with a fragment from the Met-DNA containing the Tcf recognition sequence CAAAG induces the cells to metastasize in syngeneic rats in vivo. Tcf-4 expression in human breast carcinomas is inversely associated with osteopontin protein levels. High Tcf-4 expression impedes both OPN promoter activity and protein expression in rat mammary carcinoma cells. Understanding the role of Tcf-4 in cancer development and its transcription regulation should lay the foundation for novel therapeutic approaches in the future.
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Cite this article as:
El-Tanani K. Mohamed, Ravindranath Amod, O'Connell Angeline and Johnston G. Patrick, The Role of LEF/TCF Factors in Neoplastic Transformation, Current Molecular Medicine 2008; 8 (1) . https://dx.doi.org/10.2174/156652408783565559
DOI https://dx.doi.org/10.2174/156652408783565559 |
Print ISSN 1566-5240 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5666 |
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