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The role of the Wilms tumour gene (WT1) in normal and malignant haematopoiesis

Published online by Cambridge University Press:  24 May 2007

Suzie Ariyaratana
Affiliation:
Division of Pediatric Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, USA.
David M. Loeb*
Affiliation:
Division of Pediatric Oncology, Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins, Baltimore, MD, USA.
*
*Corresponding author: David M. Loeb, Pediatric Oncology, Bunting-Blaustein Cancer Research Building, 1650 Orleans Street, Baltimore, MD 21231, USA. Tel: +1 410 955 2457; Fax: +1 410 955 8897; E-mail: loebda@jhmi.edu

Abstract

In addition to its loss playing a pivotal role in the development of a childhood kidney malignancy, the Wilms tumour 1 gene (WT1) has emerged as an important factor in normal and malignant haematopoiesis. Preferentially expressed in CD34+ haematopoietic progenitors and down-regulated in more-differentiated cells, the WT1 transcription factor has been implicated in regulation of apoptosis, proliferation and differentiation. Putative target genes, such as BCL2, MYC, A1 and cyclin E, may cooperate with WT1 to modulate cell growth. However, the effects of WT1 on target gene expression appear to be isoform-specific. Certain WT1 isoforms are over-represented in leukaemia, but the exact mechanisms underlying the role of WT1 in transformation remain unclear. The ubiquity of WT1 in haematological malignancies has led to efforts to exploit it as a marker for minimal residual disease and as a prognostic factor, with conflicting results. In vitro killing of tumour cells by WT1-specific CD8+ cytotoxic T lymphocytes facilitated design of Phase I vaccine trials that showed clinical regression of WT1-positive tumours. Alternative methods employing WT1-specific immunotherapy are being investigated and might ultimately be used to optimise multimodal therapy of haematological malignancies.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2007

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References

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140Kinane, T.B. et al. (1995) LLC-PK1 cell growth is repressed by WT1 inhibition of G-protein alpha i-2 protooncogene transcription. J Biol Chem 270, 30760-30764CrossRefGoogle ScholarPubMed
141Morrison, D.J., English, M.A. and Licht, J.D. (2005) WT1 induces apoptosis through transcriptional regulation of the proapoptotic Bcl-2 family member Bak. Cancer Res 65, 8174-8182CrossRefGoogle ScholarPubMed
142Simpson, L.A. et al. (2006) The antiapoptotic gene A1/BFL1 is a WT1 target gene that mediates granulocytic differentiation and resistance to chemotherapy. Blood 107, 4695-4702CrossRefGoogle ScholarPubMed
143Loeb, D.M. et al. (2002) Cyclin E is a target of WT1 transcriptional repression. J Biol Chem 277, 19627-19632CrossRefGoogle ScholarPubMed
144Englert, C. et al. (1997) Induction of p21 by the Wilms' tumor suppressor gene WT1. Cancer Res 57, 1429-1434Google ScholarPubMed
145English, M.A. and Licht, J.D. (1999) Tumor-associated WT1 missense mutants indicate that transcriptional activation by WT1 is critical for growth control. J Biol Chem 274, 13258-13263CrossRefGoogle ScholarPubMed
146Li, R.S. et al. (1999) Ornithine decarboxylase is a transcriptional target of tumor suppressor WT1. Exp Cell Res 247, 257-266CrossRefGoogle ScholarPubMed
147Moshier, J.A. et al. (1996) Regulation of ornithine decarboxylase gene expression by the Wilms' tumor suppressor WT1. Nucleic Acids Res 24, 1149-1157CrossRefGoogle ScholarPubMed
148Minc, E. et al. (1999) The human copper-zinc superoxide dismutase gene (SOD1) proximal promoter is regulated by Sp1, Egr-1, and WT1 via non-canonical binding sites. J Biol Chem 274, 503-509CrossRefGoogle ScholarPubMed

Further reading, resources and contacts

This listing from the Atlas of Genetics and Cytogenetics in Oncology and Hematology neatly summarises much of what is known about the role of WT1 in human malignancy, with numerous links to external sources of further information:

Algar, E. (2002) A review of the Wilms' Tumor 1 gene (WT1) and its role in hematopoiesis and leukemia. J Hematother Stem Cell Res 11, 589-599CrossRefGoogle ScholarPubMed
Ellisen, L.W. (2002) Regulation of gene expression by WT1 in development and tumorigenesis. Int J Hematol 76, 110-116CrossRefGoogle ScholarPubMed
Reddy, J.C., Hosono, S. and Licht, J.D. (1995) The transcriptional effect of WT1 is modulated by choice of expression vector. J Biol Chem 270, 29976-29982CrossRefGoogle ScholarPubMed
Scharnhorst, V., van der Eb, A.J. and Jochemsen, A.G. (2001) WT1 proteins: functions in growth and differentiation. Gene 273, 141-161CrossRefGoogle ScholarPubMed
Algar, E. (2002) A review of the Wilms' Tumor 1 gene (WT1) and its role in hematopoiesis and leukemia. J Hematother Stem Cell Res 11, 589-599CrossRefGoogle ScholarPubMed
Ellisen, L.W. (2002) Regulation of gene expression by WT1 in development and tumorigenesis. Int J Hematol 76, 110-116CrossRefGoogle ScholarPubMed
Reddy, J.C., Hosono, S. and Licht, J.D. (1995) The transcriptional effect of WT1 is modulated by choice of expression vector. J Biol Chem 270, 29976-29982CrossRefGoogle ScholarPubMed
Scharnhorst, V., van der Eb, A.J. and Jochemsen, A.G. (2001) WT1 proteins: functions in growth and differentiation. Gene 273, 141-161CrossRefGoogle ScholarPubMed