Innate RNA-sensing pattern-recognition receptors (RNA-sensing PRRs) (RNA-sensing PRRs)

Innate RNA-sensing pattern-recognition receptors (PRRs) are a specialized class of immune sensors that detect non-self or mislocalized RNA molecules to trigger protective inflammatory responses. These receptors are strategically localized within the cell: Toll-like receptors (TLR3, TLR7, and TLR8) reside in endosomal membranes to scan for internalized viral or bacterial RNA, while RIG-I-like receptors (RIG-I and MDA5) monitor the cytoplasm for replicating viral genomes (Schlee & Hartmann, 2016, Nature Reviews Immunology). Upon activation, these sensors recruit specific adapter proteins—such as MAVS for RIG-I/MDA5 or TRIF and MyD88 for TLRs—to activate transcription factors like IRF3/7 and NF-κB (Kawai & Akira, 2010, Nature Immunology). This signaling cascade culminates in the robust production of type I interferons and pro-inflammatory cytokines, which are critical for establishing an antiviral state and shaping adaptive immunity (Chow et al., 2018, Annual Review of Virology). Dysregulation of these pathways is a hallmark of various pathologies, including viral infections, where pathogens may evade sensing, and autoimmune interferonopathies like systemic lupus erythematosus, where endogenous RNA triggers chronic inflammation (Roers et al., 2016, Immunity). Pharmacological modulation of these receptors is a major area of drug development, with agonists being utilized as potent vaccine adjuvants and cancer immunotherapies to stimulate the tumor microenvironment (Wu et al., 2017, Frontiers in Immunology).

Other names

RNA-sensing receptorsNucleic acid-sensing PRRsCytosolic RNA sensorsEndosomal RNA sensorsRNA PRRs

Agonism of endosomal or cytosolic RNA sensors to induce type I interferon and pro-inflammatory cytokine production for antiviral or antitumor activity; antagonism to suppress pathological interferon signaling in autoimmune diseases.