RNA-sensing pattern recognition receptor (RNA-sensing PRR)

RNA-sensing pattern recognition receptors (PRRs) are a specialized class of innate immune sensors that detect viral genetic material to initiate defensive signaling. These receptors include endosomal Toll-like receptors (TLR3, TLR7, TLR8) and cytosolic RIG-I-like receptors (RIG-I, MDA5), which recognize distinct structural features of viral RNA such as double-strandedness or 5'-triphosphate ends [1][2]. Upon activation, these receptors trigger signaling cascades involving adapter proteins like MAVS or TRIF, leading to the production of type I interferons and pro-inflammatory cytokines [3]. In the context of disease, these receptors are critical for controlling viral infections but can also contribute to autoimmune disorders if chronically activated by self-RNA [4]. Therapeutically, agonists of these receptors are used as vaccine adjuvants and in cancer immunotherapy to stimulate robust T-cell responses, while antagonists are being explored for treating inflammatory conditions [5][6].

Other names

Pattern-recognition receptors for viral RNAViral RNA sensorsRNA-sensing PRRsRIG-I-like receptorsRLRsEndosomal Toll-like receptorsTLR3TLR7TLR8RIG-IMDA5

Agonism of endosomal and cytosolic RNA sensors to induce type I interferons and pro-inflammatory cytokines, thereby enhancing antiviral and antitumor immunity.