S1PR3 is a G protein-coupled receptor that binds sphingosine-1-phosphate (S1P), a bioactive lysophospholipid with diverse physiological effects 1. The receptor mediates S1P-induced cell proliferation and suppression of apoptosis [UniProt], functioning through multiple signaling pathways including adenylate cyclase activation and calcium mobilization. Mechanistically, S1PR3 operates within a complex signaling network alongside four other S1P receptor subtypes with differential tissue expression 2. In renal cell carcinoma, S1PR3 activates proliferative pathways via S1PR3/Gi/p38/Akt/p65/cyclin D1-CDK4 and migratory pathways through S1PR3/Gi/q/ERK/p38/p65, while enhancing EGFR signaling 3. Conversely, in nucleus pulposus cells, S1PR3 overexpression suppresses inflammatory responses by inhibiting TLR2-regulated STAT3 and MAPK pathways 4. S1PR3 has significant disease relevance across multiple pathologies. High S1PR3 expression correlates with worse prognosis in renal cell carcinoma patients and promotes tumor metastasis 3. In obesity-associated lymphomas, S1PR1/S1PR3-YAP signaling drives aggressive tumor growth 5. However, S1PR3 shows protective roles in intervertebral disc degeneration 4 and is implicated in neutrophil regulation during liver transplantation 6. These contrasting functions suggest context-dependent roles in inflammation and tissue homeostasis, positioning S1PR3 as a promising therapeutic target with disease-specific applications 1.