The Wilms' tumour suppressor WT1 is involved in endothelial cell proliferation and migration: expression in tumour vessels in vivo

Oncogene
Nicole WagnerK-D Wagner

Abstract

Vascularization is an important step in tumour growth. Although a variety of molecules, for example, VEGF, ETS-1 or nestin have been implicated in tumour angiogenesis, the molecular mechanisms of vessel formation are not fully characterized. We showed that the Wilms' tumour suppressor WT1 activates nestin during development. Here we tested whether WT1 might also be involved in tumour angiogenesis. Endothelial WT1 expression was detected in 95% of 113 tumours of different origin. To analyse the function of WT1 in endothelial cells, we used an RNAi approach in vitro and showed that inhibition of WT1 reduces cell proliferation, migration and endothelial tube formation. On a molecular level, WT1 silencing diminished expression of the ETS-1 transcription factor. WT1 and ETS-1 shared an overlapping expression in tumour endothelia. The ETS-1 promoter was stimulated approximately 10-fold by transient co-transfection of a WT1 expression construct and WT1 bound to the ETS-1 promoter in chromatin immunoprecipitation and electrophoretic mobility shift assays. Deletion of the identified WT1-binding site abolished stimulation of the ETS-1 promoter by WT1. These findings suggest that transcriptional activation of ETS-1 by the Wilms' tumour su...Continue Reading

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Dec 5, 2008·Pflügers Archiv : European journal of physiology·Holger ScholzNicole Wagner
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