Sphingosine-1-phosphate receptor 1, Sphingosine-1-phosphate receptor 4, Sphingosine-1-phosphate receptor 5 (S1PR1, S1PR4, S1PR5)

Sphingosine-1-phosphate receptors 1, 4, and 5 are integral membrane proteins belonging to the G protein-coupled receptor superfamily and serve as high-affinity receptors for the bioactive lipid sphingosine 1-phosphate. These receptors are expressed in diverse tissues, with S1PR1 showing broad distribution, S1PR4 confined mainly to hematopoietic and lymphoid tissues, and S1PR5 highly expressed in the central nervous system. They are key mediators of physiological processes such as immune cell migration, vascular integrity, and neurogenesis, and their pharmacological modulation is the basis for several approved drugs in autoimmune disorders, particularly multiple sclerosis. The therapeutic use of S1PR modulators is complicated by potential cardiovascular, ocular, and infection-related adverse events, making patient selection and monitoring essential

Other names

S1P receptor 1 (EDG1)S1P receptor 4 (EDG6)S1P receptor 5 (EDG8)S1PR1, S1PR4, S1PR5Endothelial differentiation gene 1 (S1PR1)Endothelial differentiation gene 6 (S1PR4)Endothelial differentiation gene 8 (S1PR5)

Agonism or modulation (primarily of S1PR1, S1PR4, and S1PR5 subtypes, causing lymphocyte sequestration and immunosuppression) Functional antagonism via receptor internalization and degradation following agonist binding (e.g., fingolimod phosphorylated form)