NIBR 0213 is a potent and selective inhibitor of sphingosine 1-phosphate receptor-1 (S1P1), a G protein-coupled receptor that has been highlighted as a promising therapeutic target in autoimmunity disorders.
NIBR-0213 is an orally active, potent and S1P1-selective sphingosine 1-phosphate (S1P) receptor antagonist th at blocks S1P1-selective ligand AUY954-induced Ca2+ mobilization (IC50 = 2.5 nM using human S1P1-transfected HeLa cells; IC50 >10 μM with human S1P2, S1P3, or S1P4 transfectants) and S1P-induced GTPγS recruitment (IC50 = 2.0/2.3/8.5 nM using membrane from human/murine/r at S1P1-transfected CHO cells; IC50 >10 μM with membrane from human S1P5 transfectant). NIBR-0213 induces long-lasting peripheral blood lymphocyte reduction in rats (EDmax = 1 mg/kg, ED50 = 0.2 mg/kg; p.o.) and exhibits therapeutic efficacy (30 mg/kg p.o; BID) in experimental autoimmune encephalomyelitis (EAE), a murine model of multiple sclerosis (MS), with no adverse effects to the animals.
