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Current Molecular Medicine
ISSN (Print): 1566-5240
ISSN (Online): 1875-5666
VOLUME: 8
ISSUE: 1
DOI: 10.2174/156652408783565559









The Role of LEF/TCF Factors in Neoplastic Transformation

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Author(s): Mohamed K. El-Tanani, Amod Ravindranath, Angeline O'Connell and Patrick G. Johnston
Pages 38-50 (13)
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
Affiliation:
Centre for Cancer Research and Cell Biology, Queen's University Belfast, Lisburn Road, Belfast BT9 7BL, UK.