Abstract
The orphan G protein-coupled receptor (GPCR) GPR124/tumor endothelial marker 5 is highly expressed in central nervous system (CNS) endothelium. Here, we show that complete null or endothelial-specific GPR124 deletion resulted in embryonic lethality from CNS-specific angiogenesis arrest in forebrain and neural tube. Conversely, GPR124 overexpression throughout all adult vascular beds produced CNS-specific hyperproliferative vascular malformations. In vivo, GPR124 functioned cell-autonomously in endothelium to regulate sprouting, migration, and developmental expression of the blood-brain barrier marker Glut1, whereas in vitro, GPR124 mediated Cdc42-dependent directional migration to forebrain-derived, vascular endothelial growth factor-independent cues. Our results demonstrate CNS-specific angiogenesis regulation by an endothelial receptor and illuminate functions of the poorly understood adhesion GPCR subfamily. Further, the functional tropism of GPR124 marks this receptor as a therapeutic target for CNS-related vascular pathologies.
MeSH Terms
Animals
Blood Vessels/abnormalities
Blood-Brain Barrier/metabolism
Cell Movement
Embryonic Development
Endothelial Cells/physiology
Endothelium, Vascular/embryology,metabolism
Gene Deletion
Glucose Transporter Type 1/metabolism
Mesencephalon/blood supply,embryology,metabolism
Mice
Mice, Knockout
Mice, Transgenic
Neovascularization, Physiologic
Neural Tube/blood supply,embryology,metabolism
Prosencephalon/blood supply,embryology,metabolism
Receptors, G-Protein-Coupled/genetics,metabolism
Rhombencephalon/blood supply,embryology,metabolism
Telencephalon/blood supply,embryology,metabolism
Chemicals
GPR124 protein, mouse
Glucose Transporter Type 1
Receptors, G-Protein-Coupled
Slc2a1 protein, mouse
Authors & Affiliations
11 authors, click to expand affiliations / ORCID
Kuhnert Frank
Department of Medicine, Hematology Division, Stanford University, Stanford, CA 94305, USA.
Mancuso Michael R
Shamloo Amir
Wang Hsiao-Ting
Choksi Vir
Florek Mareike
Su Hua
Fruttiger Marcus
Young William L
Heilshorn Sarah C
Kuo Calvin J
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