Endosomal membrane of antigen-presenting cell

The **endosomal membrane of antigen-presenting cells** is the lipid bilayer boundary of endosomes within professional immune cells responsible for internalizing, processing, and presenting antigens. Key processes occur at or across this membrane, including regulated antigen translocation into the cytosol (e.g., via translocon Sec61), controlled proteolysis and peptide loading onto major histocompatibility complex (MHC) molecules, oxidative modification by NADPH oxidase (NOX2)-mediated ROS leading to lipid peroxidation and antigen release, and the spatial organization for immune signaling. While essential for antigen presentation and immune responses, the membrane itself is not a drug target; rather, specific proteins or pathways associated with the membrane are therapeutically targeted in cancer, infectious, and autoimmune diseases. Overactivation or uncontrolled disruption of this membrane can cause cellular toxicity and immune dysregulation.

Other names

Endosomal membraneEndosome membrane of APCEndocytic vesicle membrane (within context of antigen-presenting cells)

For ROS-inducing drugs: Increase lipid peroxidation leading to antigen release into cytosol for cross-presentation. For gene therapy agents: Disrupt endosomal integrity to deliver nucleic acids.