Host innate immune pathways

Host innate immune pathways constitute the fundamental first-line defense system that detects and responds to pathogens and cellular stress. These pathways are governed by various pattern recognition receptors (PRRs), including Toll-like receptors (TLRs), RIG-I-like receptors (RLRs), and the cGAS-STING DNA-sensing pathway, which identify pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs) (NIH, Journal of Microbiology). Activation of these sensors triggers intracellular signaling cascades that culminate in the production of type I and III interferons, as well as pro-inflammatory cytokines like IL-6 and TNF-alpha (NIH, Frontiers in Immunology). In infectious diseases, pathogens often evolve mechanisms to subvert these pathways, while in cancer, the pathways are frequently suppressed to allow for immune evasion (Frontiers in Immunology, ASM). Therapeutic modulation of host innate immune pathways involves using agonists, such as imiquimod or STING ligands, to enhance immune surveillance against viruses and tumors, or using antagonists to treat chronic inflammatory and autoimmune conditions (Journal of Microbiology, NIH). However, systemic activation of these pathways carries risks such as cytokine release syndrome and autoimmunity (Frontiers in Immunology, NIH).

Other names

Innate immune systemInnate immunity signalingPattern recognition receptor pathwaysHost-directed immune pathwaysInnate immune response pathways

Modulation of pattern recognition receptors (PRRs) and downstream signaling adaptors to either stimulate an antimicrobial/anti-tumor environment or suppress pathological inflammation.