Lanraplenib

• CAT Number: I018502
• CAS Number: 1800046-95-0
• Molecular Formula: C23H25N9O
• Molecular Weight: 443.50
• Purity: ≥95%
• Synonyms: 6-(6-aminopyrazin-2-yl)-N-[4-[4-(oxetan-3-yl)piperazin-1-yl]phenyl]imidazo[1,2-a]pyrazin-8-amine
• InChI: InChI=1S/C23H25N9O/c24-21-12-25-11-19(28-21)20-13-32-6-5-26-23(32)22(29-20)27-16-1-3-17(4-2-16)30-7-9-31(10-8-30)18-14-33-15-18/h1-6,11-13,18H,7-10,14-15H2,(H2,24,28)(H,27,29)
• InChIKey: XCIGZBVOUQVIPI-UHFFFAOYSA-N
• SMILES: C1CN(CCN1C2COC2)C3=CC=C(C=C3)NC4=NC(=CN5C4=NC=C5)C6=CN=CC(=N6)N

Lanraplenib (GS-9876) is a highly selective and orally active SYK inhibitor (IC50=9.5 nM) in development for the treatment of inflammatory diseases. Lanraplenib (GS-9876) inhibits SYK activity in platelets via the glycoprotein VI (GPVI) receptor without prolonging bleeding time (BT) in monkeys or humans[1][2][3].
Lanraplenib (GS-9876) inhibits anti-IgM stimulated phosphorylation of AKT, BLNK, BTK, ERK, MEK, and PKCδ in human B cells with EC50 values of 24-51 nM. Lanraplenib (GS-9876) inhibits anti-IgM mediated CD69 and CD86 expression on B-cells (EC50=112±10 nM and 164±15 nM, respectively) and anti-IgM /anti-CD40 co-stimulated B cell proliferation (EC50=108±55 nM). In human macrophages, Lanraplenib (GS-9876) inhibits IC-stimulated TNFα and IL-1β release (EC50=121±77 nM and 9±17 nM, respectively)[1].
Lanraplenib (GS-9876) inhibits glycoprotein VI (GPVI)-induced phosphorylation of linker for activation of T cells and phospholipase Cγ2, platelet activation and aggregation in human whole blood, and platelet binding to collagen under arterial flow[2].

Reference

[1]. Di Paolo J, et al. FRI0049 Preclinical Characterization of GS-9876, A Novel, Oral SYK Inhibitor That Shows Efficacy in Multiple Established Rat Models of Collagen-Induced Arthritis.Annals of the Rheumatic Diseases 2016;75:443-444.

[2]. Clarke AS, et al. Effects of GS-9876, a novel spleen tyrosine kinase inhibitor, on platelet function and systemic hemostasis. Thromb Res. 2018 Oct;170:109-118.
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[3]. Kivitz AJ, et al. GS-9876, a Novel, Highly Selective, SYK Inhibitor in Patients with Active Rheumatoid Arthritis: Safety, Tolerability and Efficacy Results of a Phase 2 Study [abstract]. Arthritis Rheumatol.2018; 70 (suppl 10).