Sphingosine-1-phosphate receptor 1; Sphingosine-1-phosphate receptor 5 (S1PR1; S1PR5)

Sphingosine-1-phosphate receptor 1 (S1PR1) and sphingosine-1-phosphate receptor 5 (S1PR5) are members of the S1P receptor family (S1PR1–5), which are G protein-coupled, seven-transmembrane domain receptors. Both receptors bind the sphingolipid S1P, mediating a variety of physiological effects. S1PR1 is widely expressed, especially on endothelial and immune cells, and is vital for lymphocyte circulation, endothelial barrier regulation, and vascular maturation. S1PR5 is expressed primarily in the central nervous system (oligodendrocytes, white matter) and spleen, but also on certain immune cells such as natural killer cells and patrolling monocytes, where it regulates cell trafficking. Both receptors are established therapeutic targets, particularly in immunological and neurodegenerative disorders, with several approved drugs (notably S1P receptor modulators) exerting immunosuppressive effects by modulating receptor function

Other names

S1PR1Endothelial differentiation gene 1 (EDG1)S1PR5Endothelial differentiation gene 8 (EDG8)

Functional antagonism (induced receptor internalization and downregulation) Blockade of lymphocyte egress from lymph nodes (immunomodulation/immune cell sequestration) Modulation of vascular permeability and endothelial barrier integrity Regulation of cell migration in the CNS and peripheral tissues