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Semaphorin 3E and Plexin-D1 Control Vascular Pattern Independently of Neuropilins

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Science  14 Jan 2005:
Vol. 307, Issue 5707, pp. 265-268
DOI: 10.1126/science.1105416

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Abstract

The development of a patterned vasculature is essential for normal organogenesis. We found that signaling by semaphorin 3E (Sema3E) and its receptor plexin-D1 controls endothelial cell positioning and the patterning of the developing vasculature in the mouse. Sema3E is highly expressed in developing somites, where it acts as a repulsive cue for plexin-D1–expressing endothelial cells of adjacent intersomitic vessels. Sema3E–plexin-D1 signaling did not require neuropilins, which were previously presumed to be obligate Sema3 coreceptors. Moreover, genetic ablation of Sema3E or plexin-D1 but not neuropilin-mediated Sema3 signaling disrupted vascular patterning. These findings reveal an unexpected semaphorin signaling pathway and define a mechanism for controlling vascular patterning.

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