Abstract
In development, tissue regeneration or certain diseases, angiogenic growth leads to the expansion of blood vessels and the lymphatic vasculature. This involves endothelial cell proliferation as well as angiogenic sprouting, in which a subset of cells, termed tip cells, acquires motile, invasive behaviour and extends filopodial protrusions1,2,3. Although it is already appreciated that angiogenesis is triggered by tissue-derived signals, such as vascular endothelial growth factor (VEGF) family growth factors, the resulting signalling processes in endothelial cells are only partly understood. Here we show with genetic experiments in mouse and zebrafish that ephrin-B2, a transmembrane ligand for Eph receptor tyrosine kinases, promotes sprouting behaviour and motility in the angiogenic endothelium. We link this pro-angiogenic function to a crucial role of ephrin-B2 in the VEGF signalling pathway, which we have studied in detail for VEGFR3, the receptor for VEGF-C. In the absence of ephrin-B2, the internalization of VEGFR3 in cultured cells and mutant mice is defective, which compromises downstream signal transduction by the small GTPase Rac1, Akt and the mitogen-activated protein kinase Erk. Our results show that full VEGFR3 signalling is coupled to receptor internalization. Ephrin-B2 is a key regulator of this process and thereby controls angiogenic and lymphangiogenic growth.
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Change history
27 May 2010
Three duplicated references have been removed
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Acknowledgements
We thank R. Benedito, I. Schmidt, S. Hoffmann, I. Rosewell, S.M. Kuijper, F. Gisler and N. Hostettler for their help, N. Copeland and A. Eichmann for information and reagents, P. Chambon for the CreERT2 cDNA, A.L. Bermange, J.D. Leslie and J. Lewis for help with zebrafish experiments, and A. Acker-Palmer for discussions and for reading the manuscript. Cancer Research UK, the Max-Planck-Society, the German Research Foundation (programmes SFB 629 and SPP 1190) and the EMBO LTF programme provided funding.
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Y.W., M.E.P., M.N., C.D.N. and R.H.A. designed experiments. Y.W., M.E.P. and T.S.S. characterized mouse mutants. M.L.B. and A.S. performed zebrafish experiments, M.L.B. microinjection assays and M.N. all other cell culture experiments. A.D., U.D., L.E.B., S.A. and T.M. generated mouse mutants or lines, U.L. and A.B. the EphB4 inhibitors. Y.W., M.N., M.E.P. and R.H.A. wrote the manuscript.
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U.L. and A.B. are employed by Oncalis, the company that has developed the inhibitors ONC-101 and ONC-102.
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Supplementary Information
This file contains Supplementary Methods and References, Supplementary Figures 1-16 with legends and full captions for Supplementary Movies S1-S3. (PDF 8879 kb)
Supplementary Movie S1
A fluorescent time-lapse movie showing dynamics of intersegmental vessels in 27 hpf fli1-EGFP embryo injected with control morpholino. (MOV 2136 kb)
Supplementary Movie S2
Intersegmental vessels in 27 hpf efnb2a-MO-injected fli1-EGFP embryo showed few filopodia and instead blunt, bleb-like protrusions were seen on the cell surface. (MOV 2298 kb)
Supplementary Movie S3
Ephrin-B2 overexpression in single cells within a confluent monolayer of (uninjected) HUVECs. (MOV 3090 kb)
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Wang, Y., Nakayama, M., Pitulescu, M. et al. Ephrin-B2 controls VEGF-induced angiogenesis and lymphangiogenesis. Nature 465, 483–486 (2010). https://doi.org/10.1038/nature09002
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DOI: https://doi.org/10.1038/nature09002