VEGFR3/Flt-4

VEGFR3/Flt-4 is a receptor tyrosine kinase whose expression becomes mainly restricted to lymphatic endothelium during development, defining it as a core regulator of lymphatic vessel biology[1]. Its ligands VEGF-C and VEGF-D activate VEGFR3, and VEGF-C induces VEGFR3 autophosphorylation and lymphangiogenesis in experimental systems[2][3]. Mechanistically, VEGFC/FLT4 signaling can promote endothelial sprouting through ERK-linked cell-cycle control in venous and lymphatic endothelial cells[4]. In tumor models, VEGFR3 signaling supports tumor lymphangiogenesis and regional lymph-node metastasis, making the VEGF-C/VEGFR3 axis relevant for metastasis-focused experimental design[5]. Compared with VEGFR2-driven angiogenic signaling, VEGFR3 ligand-binding and kinase activity are required for lymphangiogenesis but not angiogenesis, while VEGFR3 can modulate VEGFR2-mediated vascular permeability signaling[6][7]. For isoform-specific studies, VEGF-C Cys156Ser functions as a selective VEGFR3 agonist that binds and activates VEGFR3 without activating VEGFR2, supporting receptor-selective pathway analysis[8]. - VEGFR3/Flt-4 primarily supports lymphatic endothelial signaling, lymphangiogenesis, and metastasis-relevant vascular remodeling. - VEGF-C Cys156Ser enables VEGFR3-selective activation, separating lymphatic signaling from VEGFR2 permeability effects.
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