George D Yancopoulos, Michael Klagsbrun, Judah Folkman  Cell 

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Vasculogenesis, Angiogenesis, and Growth Factors: Ephrins Enter the Fray at the Border  George D Yancopoulos, Michael Klagsbrun, Judah Folkman  Cell  Volume 93, Issue 5, Pages 661-664 (May 1998) DOI: 10.1016/S0092-8674(00)81426-9

Figure 1 Presumed Distributions and Sites of Action of ephrin-B2 and Eph-B4 in the Primary Capillary Plexus and during Later Maturation of the Vascular Network Wang et al. define ephrin-B2 and Eph-B4 as a ligand/receptor pair that distinguish arterial as opposed to venous endothelial cells in the otherwise homogenous primary capillary plexus; since both ephrin-B2 and Eph-B4 act only as membrane-bound proteins, they presumably interact with each other only at the junction of the arterial and venous endothelial cells, in what we term a “cis” manner (left panel). The primary plexus is remodeled by angiogenic processes involving the interdigitation, branching, and differential growth of vessel segments. During these remodeling stages ephrin-B2 and Eph-B4 remain localized to arterial and venous endothelial cells, respectively. They presumably continue to interact at junctions of small branches (future capillaries) joining the arterial and venous systems (labeled as CIS interactions), but they may also interact at the surfaces between interdigitating large vessels as they pass each other (labeled as Trans interactions) (right panel). Other growth factors acting on endothelial cells, such as VEGF and Angiopoietin-1, appear to be acting more symmetrically. VEGF is required for formation of the primary capillary plexus, while ephrin-B2 and Angiopoietins instead are required during angiogenic remodeling. See text for more details. Cell 1998 93, 661-664DOI: (10.1016/S0092-8674(00)81426-9)