Sphingolipid metabolism

Sphingolipid metabolism refers to the entire set of enzymatic reactions and regulatory processes involved in the synthesis, modification, interconversion, and degradation of sphingolipids—a diverse class of bioactive lipids with key roles in membrane structure, cell signaling, apoptosis, immune response, and cell proliferation. Central to this pathway is the generation of ceramide, which serves as a metabolic hub: it can be converted into complex sphingolipids such as sphingomyelin and glycosphingolipids, further metabolized to sphingosine and sphingosine-1-phosphate (S1P), or broken down for recycling. Dysregulation of sphingolipid metabolism is implicated in numerous diseases, including cancer, metabolic and neurodegenerative disorders, cardiovascular diseases, and inflammation. As a pathway, "sphingolipid metabolism" is not a single molecular target but encompasses numerous enzymes (e.g., serine palmitoyltransferase, sphingomyelinases, ceramidases, sphingosine kinases) and regulatory proteins, several of which are therapeutic targets in their own right[1][2][3][4][5][7][10]. "Sphingolipid metabolism" describes a biochemical pathway, not a discrete molecular target such as a receptor, enzyme, or transporter. While many individual enzymes within the pathway (e.g., sphingosine kinases, sphingomyelinases) are validated or candidate drug targets, the pathway itself cannot be drugged as a unit. If a specific enzyme or node within "sphingolipid metabolism" is desired, further specification is advised.

Inhibition of sphingosine kinase (e.g., SPHK1/SPHK2); Modulation of sphingosine-1-phosphate receptors (e.g., S1PR1); Induction of ceramide-mediated apoptosis; Inhibition of acid sphingomyelinase (ASMase); Inhibition of acid ceramidase (AC)[2]