Lipid rafts on antigen-presenting cells

Cholesterol-rich cell membrane domains, commonly referred to as lipid rafts, are specialized microdomains within the plasma membrane of antigen-presenting cells (APCs) that are enriched in cholesterol, sphingolipids, and specific proteins (Varshney et al., 2016). These domains serve as organizing centers for signaling molecules, facilitating the assembly of the immunological synapse between APCs and T cells (Anderson et al., 2000). By concentrating major histocompatibility complex (MHC) molecules and co-stimulatory proteins, lipid rafts play a critical role in efficient antigen presentation and subsequent T-cell activation (Gidwani et al., 2003). In various diseases, including autoimmune disorders and chronic inflammation, the dysregulation of these domains can lead to aberrant immune responses. Pharmacological modulation of lipid rafts, often through cholesterol depletion or sequestration using agents like statins or methyl-beta-cyclodextrin, is explored as a strategy to dampen overactive immune signaling or prevent pathogen entry (Zidovetzki & Levitan, 2007).

Other names

Lipid raftsMembrane microdomainsDetergent-resistant membranes (DRMs)Cholesterol-rich microdomainsMembrane rafts

Disruption of membrane microdomain integrity through cholesterol depletion or sequestration, leading to the dissociation of signaling complexes and inhibition of antigen presentation.