Dendritic cell activation via paracrine cytokine signaling

Dendritic cell activation via paracrine cytokine signaling refers to the process by which DCs receive activation and maturation cues from cytokines secreted by neighboring cells (e.g., infected/stressed cells, innate immune cells), in addition to pathogen-sensing signals such as TLR agonists. At the molecular level, DC activation and maturation involve engagement of pattern-recognition receptors (notably TLRs) and cytokine receptors, which converge on key pathways including MAPK, NF-κB, and IRF, leading to upregulation of costimulatory molecules (CD40, CD80, CD86), enhanced antigen presentation (MHC), DC survival signals, and secretion of cytokines such as IL-12p70, IFN-α/β, and IL-10 that shape T cell polarization.[1][2][4] NF-κB signaling is closely linked with DC maturation, while ERK signaling contributes to survival during activation; these facets can be experimentally separable during LPS-induced activation.[1] The activation state and timing of maturation profoundly influence downstream T cell responses; for example, shorter ex vivo maturation intervals can enhance subsequent IL-12p70 production and T cell priming, informing DC vaccine design.[2] Functionally, activated DCs drive antigen-specific CD4+ and CD8+ T cell responses via antigen presentation and costimulatory and cytokine cues, impacting immunity against infections and tumors as well as autoimmune pathogenesis.[3][4][5]

Other names

DC activation by cytokinesparacrine cytokine-driven dendritic cell maturationcytokine-mediated DC activation

Costimulation blockade (inhibiting CD28–B7 or LFA-3–CD2 to reduce DC-driven T cell activation); TLR pathway agonism to promote DC maturation and cytokine production via MAPK, NF-κB, and IRFs; Modulation of JAK/STAT signaling in cytokine pathways influencing DC activation state (conceptual link within cytokine signaling to DCs)