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Erschienen in: Angiogenesis 1/2009

01.03.2009 | Original Paper

Osteoprotegerin and RANKL differentially regulate angiogenesis and endothelial cell function

verfasst von: Joseph S. McGonigle, Cecilia M. Giachelli, Marta Scatena

Erschienen in: Angiogenesis | Ausgabe 1/2009

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Abstract

Osteoprotegerin (OPG) a soluble tumor necrosis factor receptor family molecule protects endothelial cells from apoptosis in vitro and promotes neovascularization in vivo. In this study, we assessed the role of OPG and its ligands, receptor activator of nuclear factor-κB ligand (RANKL) and tumor necrosis factor-related apoptosis inducing ligand (TRAIL), in microvessel formation using the rat aortic ring model of angiogenesis. OPG was found to promote a twofold increase in angiogenic sprouting in the aortic ring model, and this effect was inhibited by pre-incubation with a fivefold molar excess of either RANKL or TRAIL. While TRAIL had no effect upon angiogenesis on its own, RANKL was found to potently inhibit basal and vascular endothelial growth factor-induced angiogenesis. OPG increased the rate of endothelial cell proliferation in sprouting microvessels; in contrast, RANKL inhibited proliferation. RANKL was found to induce endothelial apoptosis at days 6, 7, and 10 in the aortic ring model and after incubation with human umbilical vein endothelial cells (HUVECs). Signaling studies showed that OPG induced ERK1/2 and Akt phosphorylation in HUVECs while RANKL had no effect. Our results indicate that OPG is a positive regulator of microvessel formation, while RANKL is an angiogenic inhibitor due to effects on regulation of endothelial cell proliferation, apoptosis, and signaling.
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Metadaten
Titel
Osteoprotegerin and RANKL differentially regulate angiogenesis and endothelial cell function
verfasst von
Joseph S. McGonigle
Cecilia M. Giachelli
Marta Scatena
Publikationsdatum
01.03.2009
Verlag
Springer Netherlands
Erschienen in
Angiogenesis / Ausgabe 1/2009
Print ISSN: 0969-6970
Elektronische ISSN: 1573-7209
DOI
https://doi.org/10.1007/s10456-008-9127-z

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