Abstract
The lipid mediator sphingosine-1-phosphate (S1P), which is constitutively produced by sphingosine kinase 1 (SphK1) in circulating erythrocytes and vascular endothelial cells, is exported into plasma to regulate vascular formation, vascular barrier function, vascular tonus, and lymphocyte trafficking through G protein-coupled S1P receptors. S1P1, a principal endothelial S1P receptor, has crucial functions in developmental vascular formation and the maintenance of barrier function. The stabilizing action of S1P1 on endothelial intercellular junctions leads to inhibition of sprouting angiogenesis. S1P1 maintains barrier integrity through the activation of the small G protein Rac. Engagement of S1P1 triggers internalization of S1P1 into early endosomes, in which Rac activation occurs. The class IIα isoform of phosphatidylinositol 3-kinase (PI3K-C2α) is required for the internalization of activated S1P1 and Rac activation on early endosomes. Endothelial cells also express S1P2, which is a prototypic G12/13-coupled chemorepellant receptor to activate RhoA with downstream inhibition of Rac and Akt. Endothelial S1P2, together with S1P2 in myeloid cells, mediates inhibition of tumor angiogenesis. This action, in concert with a direct inhibitory effect of S1P2 on proliferation of tumor cells, suppresses tumor growth. Endothelial S1P2 also suppresses disruption of intercellular junctions and resultant fatal vascular hyperpermeability in anaphylaxis, by limiting mediator-induced activation of eNOS through Rho-Rho kinase-PTEN-dependent suppression of Akt. Thus, endothelial S1P1 and S1P2 have specialized, distinct roles in the regulation of angiogenesis and vascular barrier integrity.
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Abbreviations
- S1P:
-
Sphingosine-1-phosphate
- SphK:
-
Sphingosine kinase
- GPCR:
-
G protein-coupled receptor
- PLC:
-
Phospholipase C
- PI3K:
-
Phosphatidylinositol 3-kinase
- PI3K-C2α:
-
Class IIα isoform of phosphatidylinositol 3-kinase
- PAF:
-
Platelet-activating factor
- eNOS:
-
Endothelial NO synthase
- ERK:
-
Extracellular signal-regulated kinase
- JNK:
-
Jun N-terminal kinase
- MAPK:
-
Mitogen-activated protein kinase
- PTEN:
-
Phosphatase and Tensin Homolog Deleted from Chromosome 10
- HUVECs:
-
Human umbilical vein endothelial cells
- VEGF:
-
Vascular endothelial growth factor
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This work was supported by grants from the Ministry of Education, Science, Sports and Culture of Japan, the Japan Society for the Promotion of Science, and grants for Core Research for Evolutional Science and Technology from JST, and IPNU Research Promotion Fund.
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Takuwa, N., Okamoto, Y., Yoshioka, K., Takuwa, Y. (2015). Vascular Endothelial S1P2 Receptor Limits Tumor Angiogenesis and Hyperpermeability. In: Yokomizo, T., Murakami, M. (eds) Bioactive Lipid Mediators. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55669-5_17
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