SF-9-2 is a PD-L1/PD-1 binding inhibitor (IC50 = 24.9 nM). SF-9-2 inhibits epithelial-mesenchymal transition, migration, invasion, and proliferation of SK-N-SH cells, and also induces apoptosis and cell cycle arrest. SF-9-2 blocks PD-L1-induced SK-N-SH cell growth through the MAPK signaling pathway. SF-9-2 restores GSK-3beta activity and enhances PD-L1 degradation through the ubiquitin-proteasome pathway. SF-9-2 inhibits tumor growth in the SK-N-SH NOG mouse model without significant toxicity. SF-9-2 also acts as an immune checkpoint inhibitor, blocking PD-L1 to restore T cell function. SF-9-2 can be used in neuroblastoma research[1].
