TLR8

TLR8 is an endosomal pattern-recognition receptor that detects RNA degradation products and activates innate immune signaling in human myeloid cells^[1][2]. Mechanistically, RNase T2 processes single-stranded RNA into uridine and purine-2′,3′-cyclophosphate-terminated oligoribonucleotides, which engage two TLR8 ligand-binding pockets^[1][2]. In monocytes, TLR8 and TLR7 activate distinct pathways during RNA virus infection, making isoform-specific analysis essential for antiviral and inflammatory research^[3]. Disease studies show that TLR8 gain-of-function variants cause neutropenia, antibody deficiency, lymphoproliferation, and bone marrow failure, linking excessive TLR8 signaling to human immunopathology^[4]. For experimental applications, selective synthetic agonists help distinguish TLR8 biology from TLR7 biology by separating target-cell selectivity and cytokine-induction profiles^[5].- TLR8 links RNA degradation sensing to innate immune activation in human myeloid cells.- Isoform-specific assays distinguish TLR8 signaling from related TLR7 pathways.- Agonist tools support controlled studies of cytokine induction and immune-cell activation.