Innate immune pattern recognition receptors and adaptive immune receptors (PRRs and AIRs)

Innate immune pattern recognition receptors (PRRs) and adaptive immune receptors represent the two primary sensing systems of the vertebrate immune system. PRRs, including Toll-like receptors (TLRs), NOD-like receptors (NLRs), and RIG-I-like receptors (RLRs), are germline-encoded proteins that detect pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs) (Source: StatPearls, Innate Immunity). In contrast, adaptive immune receptors, specifically T-cell receptors (TCRs) and B-cell receptors (BCRs), are generated through somatic recombination, allowing for the recognition of a vast array of specific antigens (Source: Janeway's Immunobiology). These receptor systems are critical for host defense; however, their overactivation or failure to distinguish self from non-self leads to conditions such as sepsis, rheumatoid arthritis, and systemic lupus erythematosus (Source: Nature Reviews Immunology). Pharmacological intervention targeting these receptors includes the use of TLR agonists like Imiquimod for viral infections and skin cancers, as well as monoclonal antibodies that modulate adaptive signaling, such as Pembrolizumab for oncology (Source: FDA, PubMed). The complexity of these systems presents challenges in drug development, particularly regarding the risk of systemic inflammatory responses or profound immunosuppression.

Other names

Pattern recognition receptorsAntigen receptorsImmune receptorsPRRsAIRsInnate and adaptive immune sensors

Agonism or antagonism of specific innate or adaptive receptors to modulate immune signaling pathways.