Abstract
Tumor suppressor p53 has been shown to repress expression of vascular endothelial growth factor (VEGF), an endothelial cell-specific mitogen and a key mediator of tumor angiogenesis. The p63 gene, recently identified as a p53-relative, encodes multiple isoforms with structural and functional similarities and differences from p53. In this study, we show the evidence that the two major isoforms of the p63 gene, TAp63γ (p51A) and dNp63α (p73L), represses and upregulates VEGF expression, respectively, on transcription and protein levels. Transient transfection assays show that a hypoxia-inducible factor (HIF) 1 binding site within the VEGF promoter region is responsible for both upregulation and repression by dNp63α and by TAp63γ, respectively, of the VEGF promoter activity. We also show that TAp63γ targets HIF1α for promoting proteasomal degradation but that dNp63α targets HIF1α for stabilization. Mammalian two-hybrid assays show that HIF1α-dependent transcription is repressed by TAp63γ as well as by p53, whereas it is upregulated by dNp63α in collaboration with a transcription coactivator p300. Our data also show that dNp63α acts as a dominant-negative reagent toward both p53- and TAp63γ-mediated degradation of HIF1α and repression of HIF1α-dependent transcription. These results suggest that p63 is involved in the regulation of the VEGF gene expression and that modulation of VEGF expression by TAp63γ and dNp63α is closely correlated with their distinct roles on the regulation of HIF1α stability.
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Acknowledgements
We thank Drs GL Semenza, PA D'Amore and S Ishii for providing the plasmids. We also thank T Matsumura for help in establishing the inducible H1299 cell lines. This work was partially supported by 2001 Tokai University School of Medicine Research Aid.
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Senoo, M., Matsumura, Y. & Habu, S. TAp63γ (p51A) and dNp63α (p73L), two major isoforms of the p63 gene, exert opposite effects on the vascular endothelial growth factor (VEGF) gene expression. Oncogene 21, 2455–2465 (2002). https://doi.org/10.1038/sj.onc.1205330
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DOI: https://doi.org/10.1038/sj.onc.1205330
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