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Expression of the vascular endothelial growth factor gene is inhibited by p73

Abstract

Recently, p73, a new member of the p53 family, has been cloned and mapped to chromosome 1p36, a region that is frequently deleted in a variety of human cancers. p73 can activate p53-responsive promoters and induce apoptosis when overexpressed in certain p53-deficient tumor cells. In contrast to p53, analysis of the p73 gene in several human solid tumors did not reveal loss of p73 expression or mutations in the p73 gene. However, transcriptional silencing of the p73 gene by hypermethylation of a CpG island was observed in several leukemias and lymphomas. These lymphoid neoplasms also show increased expression of vascular endothelial growth factor (VEGF), an endothelial cell-specific mitogen and a key mediator of angiogenesis. To evaluate a possible relationship between p73 status and VEGF expression, we have studied the effect of ectopically expressed p73 on the regulation of the VEGF gene. Our results demonstrate that p73 can down-regulate endogenous VEGF gene expression on mRNA and protein level. This effect is mediated by transcriptional repression of the VEGF promoter and involves the promoter region −85 to −50 bp, containing a cluster of Sp 1 binding sites. Our results suggest a regulatory role for p73 in tumor angiogenesis.

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Acknowledgements

We thank Dr Daniel Caput for the p73α expression plasmid and Dr Maren Mundt for the pGL2-PG13-luc reporter plasmid. We thank Dr Karin Weindel for help with the VEGF-ELISA. Critical reading of the manuscript by Dr Michael Kubbutat and Dr Christoph Sachsenmaier is greatly appreciated. This work was supported by ‘Kirstins Weg e.V.'.

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Salimath, B., Marmé, D. & Finkenzeller, G. Expression of the vascular endothelial growth factor gene is inhibited by p73. Oncogene 19, 3470–3476 (2000). https://doi.org/10.1038/sj.onc.1203672

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