Innate immune pattern-recognition and danger-sensing pathways (PRR pathways)

The innate immune pattern-recognition and danger-sensing pathways represent the primary sensory apparatus of the host immune system, responsible for detecting and responding to biological threats. These pathways are centered around Pattern Recognition Receptors (PRRs), including Toll-like receptors (TLRs), NOD-like receptors (NLRs), RIG-I-like receptors (RLRs), and cytosolic DNA sensors such as cGAS-STING. PRRs identify conserved microbial motifs known as Pathogen-Associated Molecular Patterns (PAMPs) and endogenous signals of cellular damage called Damage-Associated Molecular Patterns (DAMPs). Activation of these receptors initiates complex signaling cascades that culminate in the production of pro-inflammatory cytokines, chemokines, and interferons, which orchestrate the initial immune response and shape subsequent adaptive immunity. Dysregulation of these pathways is a hallmark of numerous diseases, including chronic inflammatory conditions, autoimmune disorders, and cancer. Consequently, these pathways are major therapeutic targets; agonists are being developed to 'warm up' cold tumors in oncology, while antagonists and inhibitors are explored to treat hyperinflammatory states like sepsis and COVID-19.

Other names

Pattern recognition receptor signalingPAMP and DAMP sensing pathwaysInnate immune sensingDanger-associated molecular pattern sensingInnate immune sensor pathways

Modulation of pattern recognition receptors (PRRs) to either stimulate innate immune responses for anti-tumor or anti-viral activity, or to inhibit excessive inflammatory signaling in autoimmune and hyperinflammatory conditions.