Hepatocyte plasma membrane and lipid rafts

The hepatocyte plasma membrane is a highly organized cellular boundary that facilitates the liver's diverse metabolic and secretory functions. Lipid rafts are dynamic, cholesterol- and sphingolipid-rich microdomains within this membrane that serve as essential platforms for the assembly of signaling complexes and the regulation of membrane protein trafficking (Lingwood & Simons, 2010, Science). These structures are particularly significant in infectious diseases, as they are exploited by pathogens such as the Hepatitis C virus and Plasmodium species for cellular entry (Kapoor et al., 2011, J Biol Chem; Silvie et al., 2003, Nature Medicine). Additionally, lipid rafts play a role in metabolic signaling, influencing the activity of the insulin receptor and various bile acid transporters like the sodium/taurocholate cotransporting polypeptide (NTCP) (Vial & Schneiter, 2002, Progress in Lipid Research). While the membrane and its rafts are not traditional single-molecule drug targets, they are pharmacologically relevant sites where drugs like cholesterol-depleting agents can disrupt pathological processes (Zhuang et al., 2005, J Lipid Res). However, the therapeutic utility of targeting these domains is limited by a lack of tissue specificity and the risk of interfering with fundamental cellular signaling pathways.

Other names

Hepatic plasma membraneHepatocyte membrane microdomainsDetergent-resistant membranes (DRMs) in hepatocytes

Disruption of lipid raft assembly through cholesterol depletion or sequestration, thereby inhibiting raft-associated signaling and pathogen entry.