Abstract
Wilms' tumour (WT) or nephroblastoma is the most frequent kidney cancer in children. In a previous study, we reported alterations to WT1 transcription in 90% of WT tested, with decreased exon 5 +/− isoform ratio being the most frequent alteration (56% of WT). We now report an approach based on cDNA profiling of tumour pools to identify genes likely to be dysregulated in association with a decreased WT1 exon 5 +/− ratio. We compared the expression profiles of pools of tumours classified according to whether this isoform imbalance was present (five tumours) or not (four tumours), using Atlas Cancer cDNA expression arrays. Fourteen of 588 genes tested displayed specific up-regulation (CCND2, PCNA, N-MYC, E2F3, TOP2A, PAK1, DCC and PCDH2) or down-regulation (VEGF, IGFBP5, TIMP3, ARHB, C-FOS and CD9) in the pool of tumours with decreased exon 5 +/− ratio. These results were validated by RT–PCR analysis of four genes (CCND2, PCNA, VEGF and IGFBP5). We extended the analysis of VEGF expression to 51 tumours by real-time RT–PCR and ascertained differential expression of this gene associated with WT1 expression pattern. Moreover, our results suggest that the VEGF expression level may be of prognosis relevance for relapsed patients.
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Acknowledgements
We thank Drs P Boute, M Fabre, J-C Fournet, B Gilbert, F Jaubert, F Pein, B Pautard and H van Tinteren for providing tumour samples and clinical data. This work was supported by the Institut National de la Santé et de la Recherche Médicale, the Association pour la Recherche sur le Cancer and the Ligue Nationale contre le Cancer. D Baudry was supported by grants from the Association pour la Recherche sur le Cancer and from the Fondation pour la Recherche Médicale and M Faussillon was supported by a grant from the Ministère de la Recherche et de la Technologie.
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Baudry, D., Faussillon, M., Cabanis, MO. et al. Changes in WT1 splicing are associated with a specific gene expression profile in Wilms' tumour. Oncogene 21, 5566–5573 (2002). https://doi.org/10.1038/sj.onc.1205752
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DOI: https://doi.org/10.1038/sj.onc.1205752
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