UGCG and neuroblastoma: However, pretreatment of neuroblastoma cells with a glucosylceramide synthase inhibitor, DL-threo-1-phenyl-2-decanolylamine-3-morpholino-1-propanol HCl (D-PDMP), at a concentration of 10 μM hampers ganglioside synthesis, and represses the ability of neuroblastoma cells to inhibit dendritic cell generation.