[en] The development of new lymphatic vessels occurs in many cancerous and inflammatory diseases through the binding of VEGF-C to its receptors, VEGFR-2 and VEGFR-3. The regulation of VEGFR-2/VEGFR-3 heterodimerisation and its downstream signaling in lymphatic endothelial cells (LECs) remain poorly understood. Here, we identify the endocytic receptor, uPARAP, as a partner of VEGFR-2 and VEGFR-3 that regulates their heterodimerisation. Genetic ablation of uPARAP leads to hyperbranched lymphatic vasculatures in pathological conditions without affecting concomitant angiogenesis. In vitro, uPARAP controls LEC migration in response to VEGF-C but not VEGF-A or VEGF-CCys156Ser. uPARAP restricts VEGFR-2/VEGFR-3 heterodimerisation and subsequent VEGFR-2-mediated phosphorylation and inactivation of Crk-II adaptor. uPARAP promotes VEGFR-3 signaling through the Crk-II/JNK/paxillin/Rac1 pathway. Pharmacological Rac1 inhibition in uPARAP knockout mice restores the wild-type phenotype. In summary, our study identifies a molecular regulator of lymphangiogenesis, and uncovers novel molecular features of VEGFR-2/VEGFR-3 crosstalk and downstream signaling during VEGF-C-driven LEC sprouting in pathological conditions.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Durré, Tania ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
Morfoisse, Florent ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
ERPICUM, Charlotte ; Centre Hospitalier Universitaire de Liège - CHU > Service d'anatomie et cytologie pathologiques
Ebroin, Marie ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
Blacher, Silvia ; Université de Liège - ULiège > Département des sciences cliniques > Labo de biologie des tumeurs et du développement
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