Endoglin promotes endothelial cell proliferation and TGF-beta/ALK1 signal transduction

The EMBO Journal
Franck LebrinPeter ten Dijke

Abstract

Endoglin is a transmembrane accessory receptor for transforming growth factor-beta (TGF-beta) that is predominantly expressed on proliferating endothelial cells in culture and on angiogenic blood vessels in vivo. Endoglin, as well as other TGF-beta signalling components, is essential during angiogenesis. Mutations in endoglin and activin receptor-like kinase 1 (ALK1), an endothelial specific TGF-beta type I receptor, have been linked to the vascular disorder, hereditary haemorrhagic telangiectasia. However, the function of endoglin in TGF-beta/ALK signalling has remained unclear. Here we report that endoglin is required for efficient TGF-beta/ALK1 signalling, which indirectly inhibits TGF-beta/ALK5 signalling. Endothelial cells lacking endoglin do not grow because TGF-beta/ALK1 signalling is reduced and TGF-beta/ALK5 signalling is increased. Surviving cells adapt to this imbalance by downregulating ALK5 expression in order to proliferate. The ability of endoglin to promote ALK1 signalling also explains why ectopic endoglin expression in endothelial cells promotes proliferation and blocks TGF-beta-induced growth arrest by indirectly reducing TGF-beta/ALK5 signalling. Our results indicate a pivotal role for endoglin in the balanc...Continue Reading

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