Dendritic cell activation via exogenous antigen processing pathway

The "dendritic cell activation via exogenous antigen processing pathway" refers to the process by which dendritic cells (DCs) capture, process, and present antigens derived from outside the cell (exogenous antigens) to T lymphocytes, thereby initiating adaptive immune responses[3][4][6]. This involves the phagocytosis or endocytosis of antigens, processing within endosomes or lysosomes, loading onto major histocompatibility complex (MHC) class II molecules, and presentation to CD4+ T cells. Activation of DCs can be triggered by signals such as pathogen-derived molecules recognized by Toll-like receptors (TLRs), leading to their maturation, upregulation of costimulatory molecules and MHC, secretion of cytokines, and migration to secondary lymphoid organs[1][3][4][7]. This pathway encompasses coordinated signaling cascades (e.g., MAPK, NF-κB, IRFs), metabolic changes (like increased glycolysis and fatty acid synthesis), and functional reprogramming necessary for initiating immunity or tolerance[2][4]. It is not a therapeutic target per se, but is central to vaccine function, immunotherapy, and the control of infectious, cancerous, and autoimmune diseases.

Other names

Dendritic cell antigen processingDendritic cell activation (general)Exogenous antigen processing pathway