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The chase for the RIG-I ligand--recent advances Schlee M; Hartmann GMol Ther 2010[Jul]; 18 (7): 1254-62Multicellular organisms evolved efficient host-defense mechanisms to sense viruses and to block their replication and spread. Invertebrates and plants mainly rely on RNA interference (RNAi) for antiviral defense. In mammals, the initiation of antiviral defense mechanisms is largely based on the detection of viral nucleic acids by innate receptors: retinoic acid-inducible gene I (RIG-I)-like helicases (RLHs) and Toll-like receptors (TLRs). RLHs play a pivotal role in sensing viral RNA and DNA in the cytoplasm of cells. RLHs, like Dicer of the RNAi pathway, belong to the phylogenetically conserved DExD/H-box family of helicases. Unlike TLRs, RLHs are functional in all somatic cells. Activation of RIG-I triggers antiviral responses including type I interferon (IFN), inflammasome activation and proapoptotic signaling. Here, we provide a comprehensive overview of the current literature on the ligand structures detected by RIG-I, and conclude with the molecular definition of the RIG-I ligand: short double-stranded blunt-end 5'-triphosphate RNA. The recent information on the RIG-I ligand now allows the design of short double-stranded RNA (dsRNA) oligonucleotides that are ideally suited alone or in combination with small-interfering RNA (siRNA) for the treatment of viral infection and cancer.|Animals[MESH]|DEAD Box Protein 58[MESH]|DEAD-box RNA Helicases/chemistry/genetics/*metabolism[MESH]|DNA, Viral/genetics/immunology[MESH]|Humans[MESH]|RNA, Viral/genetics/immunology[MESH]|Receptors, Immunologic[MESH]|Viruses/genetics/immunology[MESH] |
