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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Angiogenesis
2017 ; 20
(4
): 641-654
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A genomic screen for angiosuppressor genes in the tumor endothelium identifies a
multifaceted angiostatic role for bromodomain containing 7 (BRD7)
#MMPMID28951988
van Beijnum JR
; Nowak-Sliwinska P
; van Berkel M
; Wong TJ
; Griffioen AW
Angiogenesis
2017[Nov]; 20
(4
): 641-654
PMID28951988
show ga
Tumor angiogenesis is characterized by deregulated gene expression in endothelial
cells (EC). While studies until now have mainly focused on overexpressed genes in
tumor endothelium, we here describe the identification of transcripts that are
repressed in tumor endothelium and thus have potential suppressive effects on
angiogenesis. We identified nineteen putative angiosuppressor genes, one of them
being bromodomain containing 7 (BRD7), a gene that has been assigned tumor
suppressor properties. BRD7 was studied in more detail, and we demonstrate that
BRD7 expression is inversely related to EC activation. Ectopic expression of BRD7
resulted in a dramatic reduction of EC proliferation and viability. Furthermore,
overexpression of BRD7 resulted in a bromodomain-dependent induction of
NF?B-activity and NF?B-dependent gene expression, including ICAM1, enabling
leukocyte-endothelial interactions. In silico functional annotation analysis of
genome-wide expression data on BRD7 knockdown and overexpression revealed that
the transcriptional signature of low BRD7 expressing cells is associated with
increased angiogenesis (a.o. upregulation of angiopoietin-2, VEGF receptor-1 and
neuropilin-1), cytokine activity (a.o. upregulation of CXCL1 and CXCL6), and a
reduction of immune surveillance (TNF-?, NF?B, ICAM1). Thus, combining in silico
and in vitro data reveals multiple pathways of angiosuppressor and anti-tumor
activities of BRD7.