Angiostatic activity of DNA methyltransferase inhibitors

Molecular Cancer Therapeutics
Debby M E I HellebrekersArjan W Griffioen

Abstract

Inhibitors of DNA methyltransferases (DNMT) and histone deacetylases can reactivate epigenetically silenced tumor suppressor genes and thereby decrease tumor cell growth. Little, however, is known on the effects of these compounds in endothelial cell biology and tumor angiogenesis. Here, we show that the DNMT inhibitors 5-aza-2'-deoxycytidine and zebularine markedly decrease vessel formation in different tumor models. We show that DNMT inhibitors are antiproliferative for tumor-conditioned endothelial cells, without affecting endothelial cell apoptosis and migration. Furthermore, these compounds inhibit angiogenesis in vitro and in vivo as shown by inhibition of endothelial cells sprouting in a three-dimensional gel and inhibition of microvessel formation in the chorioallantoic membrane, respectively. 5-Aza-2'-deoxycytidine, as well as the histone deacetylase inhibitor trichostatin A, reactivates the growth-inhibiting genes TSP1, JUNB, and IGFBP3, which are suppressed in tumor-conditioned endothelial cells. Despite enhanced DNMT activity and increased overall genomic methylation levels in tumor-conditioned endothelial cells, silencing of these genes seemed not to be regulated by direct promoter hypermethylation. For IGFBP3, gen...Continue Reading

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