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First published online 18 July 2007
doi: 10.1242/dev.002907

Development 134, 3041-3048 (2007)
Published by The Company of Biologists 2007
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Endoglin is required for hemangioblast and early hematopoietic development

Rita C. R. Perlingeiro

Department of Developmental Biology, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd, Dallas, TX 75390-9133, USA.

e-mail: rita.perlingeiro{at}utsouthwestern.edu

Accepted 12 June 2007

Endoglin (ENG), an ancillary receptor for several members of the transforming growth factor (TGF)-beta superfamily, has a well-studied role in endothelial function. Here, we report that endoglin also plays an important role early in development at the level of the hemangioblast, an embryonic progenitor of the hematopoietic and endothelial lineages. Eng-/-, Eng+/- and Eng+/+ mouse embryonic stem (ES) cells were differentiated as embryoid bodies (EBs) and assayed for blast colony-forming cells (BL-CFCs). Our results showed a profound reduction in hemangioblast frequency in the absence of endoglin. Furthermore, cell-sorting experiments revealed that endoglin marks the hemangioblast on day 3 of EB differentiation. When analyzed for hematopoietic and endothelial activity, replated Eng-/- BL-CFCs presented limited hematopoietic potential, whereas endothelial differentiation was unaltered. Analysis of hematopoietic colony formation of EBs, at different time points, further supports a function for endoglin in early hematopoiesis. Taken together, these findings point to a role for endoglin in both hemangioblast specification and hematopoietic commitment.

Key words: ES cells, Endoglin, Hemangioblast, Primitive erythropoiesis, Mouse






© The Company of Biologists Ltd 2007