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Several erythropoietin-producing hepatocellular receptor B family (EPHB) and their ligands, ephrinBs (EFNBs), are involved in blood pressure regulation in animal models. We selected 528 single nucleotide polymorphisms (SNPs) within the genes of  EPHB6, EFNB2, EFNB3  and  GRIP1  in the EPH/EFN signalling system to query the International Blood Pressure Consortium dataset. A SNP within the glutamate receptor interacting protein 1 ( GRIP1)  gene presented a  p -value of 0.000389, approaching the critical  p -value of 0.000302, for association with diastolic blood pressure of 60,396 individuals. According to echocardiography, we found that  Efnb3  gene knockout mice showed enhanced constriction in the carotid arteries . In vitro  studies revealed that in mouse vascular smooth muscle cells, siRNA knockdown of GRIP1, which is in the EFNB3 reverse signalling pathway, resulted in increased contractility of these cells. These data suggest that molecules in the EPHB/EFNB signalling pathways, specifically EFNB3 and GRIP1, are involved blood pressure regulation.

The role of GRIP1 and ephrin B3 in blood pressure control and vascular smooth muscle cell contractility