Angiopoietin-1 and vascular endothelial growth factor induce expression of inflammatory cytokines before angiogenesis.

Abstract:

:The purpose of this study was to identify novel transcriptional events occurring in the aortic wall before angiogenesis. We used a defined tissue culture system that takes advantage of the capacity of rat aortic rings to generate neovessels ex vivo in response to angiogenic factor stimulation. Total RNA isolated from aortic rings 18 h posttreatment with angiopoietin (Ang)-1 or vascular endothelial growth factor (VEGF) was used to probe oligonucleotide microarrays. Many genes were up- or downregulated by either Ang-1 or VEGF, with a subset being affected by treatment with both growth factors. Grouping of genes by biological function revealed that Ang-1 and VEGF both upregulated a host of immune-related genes including many inflammatory cytokines. A mixture of the Ang-1- and VEGF-induced cytokines stimulated the spontaneous angiogenic response of aortic rings and was synergistic with a low dose of recombinant VEGF. This effect was associated with enhanced recruitment of adventitial macrophages and dendritic cells in the angiogenic outgrowths. Thus Ang-1 and VEGF activate the innate immune system of the vessel wall, stimulating the production of proangiogenic inflammatory cytokines before the emergence of neovessels. This hitherto unreported feature of the angiogenic response might represent an important early component of the cellular and molecular cascade responsible for the angiogenic response of the aortic wall.

journal_name

Physiol Genomics

journal_title

Physiological genomics

authors

Aplin AC,Gelati M,Fogel E,Carnevale E,Nicosia RF

doi

10.1152/physiolgenomics.00048.2006

subject

Has Abstract

pub_date

2006-10-03 00:00:00

pages

20-8

issue

1

eissn

1094-8341

issn

1531-2267

pii

27/1/20

journal_volume

27

pub_type

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