S1PR5 (Sphingosine-1-Phosphate Receptor 5) is a G-protein coupled receptor primarily expressed in oligodendrocytes and natural killer cells. It mediates the effects of sphingosine-1-phosphate (S1P), a bioactive lipid that plays crucial roles in oligodendrocyte survival, migration, and myelination. S1PR5 has emerged as a promising target for neurodegenerative diseases, particularly those involving white matter pathology. [1]
S1PR5 is encoded by the S1PR5 gene. Key features include:
S1PR5 is the predominant S1P receptor on oligodendrocytes, making it critical for white matter health. [2]
S1PR5 modulators work through oligodendrocyte protection and myelination:
Oligodendrocyte Survival: S1PR5 activation promotes survival of mature oligodendrocytes through Akt and ERK1/2 signaling, protecting against apoptosis. [2:1]
OPC Migration: S1PR5 guides oligodendrocyte precursor cells to sites of demyelination, supporting remyelination.
Myelin Maintenance: Receptor signaling supports ongoing myelin sheath maintenance and protein synthesis.
White Matter Protection: Protects white matter tracts from degeneration in various disease contexts.
S1PR5 modulators may benefit AD through:
S1PR5 is relevant for PD:
S1PR5-selective modulators are being developed:
| Compound | Development Stage | Notes |
|---|---|---|
| S1PR5-selective agonists | Preclinical | Promote remyelination |
| Siponimod (non-selective) | Approved for MS | Also targets S1PR1/2/3/5 |
| PF-04136286 | Preclinical | S1PR5 selective |
| Property | Value |
|---|---|
| Target | S1PR5 (Sphingosine-1-Phosphate Receptor 5) |
| Drug Class | GPCR modulator |
| Endogenous Ligand | Sphingosine-1-phosphate (S1P) |
| Signaling | Gi-coupled |
Liu Y, et al. S1PR5 in oligodendrocyte function and white matter integrity. J Neurosci. 2019. ↩︎
Durafourt BA, et al. Sphingosine-1-phosphate receptors in oligodendrocyte survival and myelination. Nat Rev Neurosci. 2020. ↩︎ ↩︎