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Journal Article
Research Support, Non-U.S. Gov't
Semaphorin 3G Provides a Repulsive Guidance Cue to Lymphatic Endothelial Cells via Neuropilin-2/PlexinD1.
Cell Reports 2016 November 23
The vertebrate circulatory system is composed of closely related blood and lymphatic vessels. It has been shown that lymphatic vascular patterning is regulated by blood vessels during development, but its molecular mechanisms have not been fully elucidated. Here, we show that the artery-derived ligand semaphorin 3G (Sema3G) and the endothelial cell receptor PlexinD1 play a role in lymphatic vascular patterning. In mouse embryonic back skin, genetic inactivation of Sema3G or PlexinD1 results in abnormal artery-lymph alignment and reduced lymphatic vascular branching. Conditional ablation in mice demonstrates that PlexinD1 is primarily required in lymphatic endothelial cells (LECs). In vitro analyses show that Sema3G binds to neuropilin-2 (Nrp2), which forms a receptor complex with PlexinD1. Sema3G induces cell collapse in an Nrp2/PlexinD1-dependent manner. Our findings shed light on a molecular mechanism by which LECs are distributed away from arteries and form a branching network during lymphatic vascular development.
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