Antigen transport to lymph nodes

Antigen transport to lymph nodes is a fundamental physiological process essential for the initiation of adaptive immune responses. It occurs via two primary pathways: passive transport, where small soluble antigens and particulates drain into lymphatic capillaries through interstitial fluid flow, and active cell-mediated transport, where professional antigen-presenting cells such as dendritic cells capture antigens and migrate to regional lymph nodes [2, 10]. This migration is largely orchestrated by the interaction between the chemokine receptor CCR7 on dendritic cells and its ligands, CCL19 and CCL21, which are expressed within the lymphatic vessels and lymph node stroma [5, 12]. In clinical practice, this process is the primary objective of vaccines and adjuvants, which seek to maximize the delivery of antigenic payloads to lymph nodes to ensure robust T and B cell activation [9, 11]. Therapeutic strategies often utilize nanotechnology, such as lipid nanoparticles (LNPs) or polymeric scaffolds, to mimic the physical properties of pathogens or to 'hitchhike' onto endogenous transport mechanisms, thereby improving vaccine efficacy and reducing systemic toxicity [3, 13]. Dysregulation of this transport mechanism is implicated in various conditions, including impaired vaccine responses in aging and the promotion of lymphatic metastasis in cancer [2, 6].

Other names

Antigen traffickingLymphatic antigen transportDendritic cell migration to lymph nodesLymphatic drainageLymph node-targeted delivery

Enhances the delivery of antigenic material to secondary lymphoid organs and promotes the maturation and chemotaxis of antigen-presenting cells toward regional lymph nodes via the CCR7-CCL19/21 axis.