Targeting Cx40 (Connexin40) Expression or Function Reduces Angiogenesis in the Developing Mouse Retina.

Details

Serval ID
serval:BIB_3B07F939D345
Type
Article: article from journal or magazin.
Collection
Publications
Title
Targeting Cx40 (Connexin40) Expression or Function Reduces Angiogenesis in the Developing Mouse Retina.
Journal
Arteriosclerosis, thrombosis, and vascular biology
Author(s)
Haefliger J.A., Allagnat F., Hamard L., Le Gal L., Meda P., Nardelli-Haefliger D., Génot E., Alonso F.
ISSN
1524-4636 (Electronic)
ISSN-L
1079-5642
Publication state
Published
Issued date
11/2017
Peer-reviewed
Oui
Volume
37
Number
11
Pages
2136-2146
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Cx40 (Connexin40) forms intercellular channels that coordinate the electric conduction in the heart and the vasomotor tone in large vessels. The protein was shown to regulate tumoral angiogenesis; however, whether Cx40 also contributes to physiological angiogenesis is still unknown.
Here, we show that Cx40 contributes to physiological angiogenesis. Genetic deletion of Cx40 leads to a reduction in vascular growth and capillary density in the neovascularization model of the mouse neonatal retina. At the angiogenic front, vessel sprouting is reduced, and the mural cells recruited along the sprouts display an altered phenotype. These alterations can be attributed to disturbed endothelial cell functions as selective reexpression of Cx40 in these cells restores normal angiogenesis. In vitro, targeting Cx40 in microvascular endothelial cells, by silencing its expression or by blocking gap junction channels, decreases their proliferation. Moreover, loss of Cx40 in these cells also increases their release of PDGF (platelet-derived growth factor) and promotes the chemoattraction of mural cells. In vivo, an intravitreal injection of a Cx40 inhibitory peptide, phenocopies the loss of Cx40 in the retinal vasculature of wild-type mice.
Collectively, our data show that endothelial Cx40 contributes to the early stages of physiological angiogenesis in the developing retina, by regulating vessel growth and maturation. Cx40 thus represents a novel therapeutic target for treating pathological ocular angiogenesis.

Keywords
Animals, Animals, Newborn, Capillaries/growth & development, Capillaries/metabolism, Cell Line, Cell Proliferation, Chemotaxis, Connexins/deficiency, Connexins/genetics, Connexins/metabolism, Down-Regulation, Endothelial Cells/metabolism, Gap Junctions/metabolism, Genotype, Mice, Inbred C57BL, Mice, Knockout, Neovascularization, Physiologic, Phenotype, Platelet-Derived Growth Factor/metabolism, RNA Interference, Retinal Vessels/growth & development, Retinal Vessels/metabolism, Signal Transduction, Transfection, Connexin40, angiogenesis, endothelium, gap junctions, mice, phenotype
Pubmed
Web of science
Open Access
Yes
Create date
16/11/2017 19:11
Last modification date
20/08/2019 14:30
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