Immunostimulatory viral rna oligonucleotides

A - Human Necessities – 61 – K

Patent

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A61K 39/39 (2006.01)

Patent

CA 2555390

Immunostimulatory sequence-specific RNA oligonucleotides corresponding to 3' terminal sequences of single-stranded minus-sense RNA genomic RNAs are provided. Also provided are compositions and methods relating to an immunostimulatory 4-mer RNA motif provided as 5'-C/U-U-G/U-U-3'. Incorporation of this short RNA motif is sufficient to confer new and altered immunostimulatory properties in new and existing oligonucleotides, including CpG oligodeoxynucleotides. Also provided are methods for use of the immunostimulatory RNA oligonucleotides and DNA:RNA chimeric oligonucleotides of the invention to induce an immune response in vitro and in vivo, as well as to treat allergy, asthma, infection, and cancer in a subject. Single-stranded oligoribonucleotides of the invention are believed to signal through a Toll- like receptor (TLR) chosen from TLR9, TLR8, TLR7, and TLR3. The oligoribonucleotides can also be used in a method to screen for TLR antagonists.

La présente invention concerne des oligonucléotides d'ARN à spécificité de séquences immunostimulatrices, correspondant aux séquences terminales 3' d'ARN génomiques d'ARN à simple brin et sens négatif; ainsi que des compositions et des méthodes liées à un motif d'ARN 4-mer immunostimulateur représenté par 5'-C/U-U-G/U-U-3'. L'introduction de ce motif d'ARN court est suffisant pour conférer des propriétés immunostimulatrices nouvelles et altérées à des oligonucléotides nouveaux et existants, y compris les oligodésoxynucléotides CpG. Cette invention concerne également des méthodes d'utilisation des oligonucléotides d'ARN immunostimulateurs et d'oligonucléotides chimériques d'ADN:ARN selon l'invention pour induire une réponse immunitaire in vitro et in vivo, ainsi que pour traiter l'allergie, l'asthme, l'infection et le cancer chez un sujet. On pense que les oligoribonucléotides monocaténaires selon l'invention envoient un signal à travers un récepteur de type Toll (TLR) sélectionné entre TLR9, TLR8, TLR7 et TLR3. Les oligoribonucléotides peuvent également être utilisés dans une méthode de criblage d'antagonistes TLR.

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