Pattern recognition receptors for RNA (RNA PRRs)

Pattern recognition receptors (PRRs) for RNA are a specialized group of innate immune sensors that detect foreign or misplaced ribonucleic acids to initiate protective immune responses. These receptors are primarily categorized into endosomal Toll-like receptors (TLR3 for dsRNA, TLR7/8 for ssRNA) and cytosolic RIG-I-like receptors (RIG-I and MDA5), which recognize specific molecular patterns such as double-stranded RNA or 5'-triphosphorylated RNA (Kawai & Akira, 2010, Nature Immunology). Upon activation, these sensors trigger signaling cascades involving adapter proteins like TRIF or MAVS, leading to the production of Type I interferons and pro-inflammatory cytokines that inhibit viral replication and prime the adaptive immune system (Chow et al., 2018, Virology). In clinical medicine, RNA PRRs are major therapeutic targets; agonists are developed as vaccine adjuvants and cancer immunotherapies to enhance anti-tumor immunity, while antagonists are explored for treating autoimmune diseases like systemic lupus erythematosus where self-RNA triggers chronic inflammation (Wu & Chen, 2014, Annual Review of Immunology). Understanding the structural basis of RNA recognition and the downstream signaling pathways is critical for developing precise modulators that can distinguish between viral and host RNA to minimize off-target toxicity.

Other names

RNA-sensing pattern recognition receptorsInnate immune RNA sensorsCytosolic RNA sensorsEndosomal RNA sensors

Agonism of endosomal TLRs (TLR3, TLR7, TLR8) or cytosolic RLRs (RIG-I, MDA5) to induce Type I interferons and pro-inflammatory cytokines; Antagonism to treat autoimmune disorders.