Schematic representation of sphingolipid metabolism. The pleotropic properties of sphingolipids play a pivotal role in hematopoiesis, migration of lymphocytes, immune response, and the signaling pathway for progression of B cell malignancies. SPT, serine palmitoyl transferase; CerS, dihydroceramide synthase; DES, dihydroceramide desaturase; SPHK, Sphingosine kinase; CerK, ceramide kinase; C1PP, ceramide-1-phosphate phosphatase; GCase, gluco-cylceramidase; GCS, glucosylceramide synthase; SMS, sphingomyelinase synthase; SMase, sphingomyelinase