SPNS3

Protein Spinster homolog 3 (SPNS3), also known as FLJ20347, is a transmembrane transporter of the spinster family. It acts as a sphingosine-1-phosphate (S1P) exporter, mediating extracellular release of S1P—a bioactive lipid regulating cell migration, proliferation, and inflammation. SPNS3 is integral to the S1P signaling pathway, where S1P binds G-protein coupled receptors (S1PRs) to transduce downstream effects.
Dysregulated SPNS3 is linked to neuroinflammatory and neurodegenerative disorders, as S1P signaling supports neuronal survival and immune cell trafficking. Drug development targeting SPNS3 remains in preclinical stages, with small-molecule modulators being explored to adjust S1P levels, potentially treating conditions like multiple sclerosis and Alzheimer’s disease.