Stabilized immune modulatory RNA (SIMRA) compounds for TLR7 and TLR8

1. A biologically stable, biologically active agonist for TLR8, TLR7 and TLR8, or TLR7, consisting essentially of two single-stranded oligoribonucleotides linked through a 3′-3′ attachment, wherein each of the oligoribonucleotides is 8 to 17 ribonucleotides in length, wherein the sequences of the oligoribonucleotides are identical, and wherein the agonist is not associated with a lipid, condensed with polyethylenimine, or complexed to DOTAP.

2. The agonist according to claim 1 , wherein the oligoribonucleotides are linked directly to each other at their 3′ ends.

3. The agonist according to claim 1 , wherein the 3′ ends of the oligoribonucleotides are linked to a non-nucleotidic linker.

4. The agonist according to claim 3 , wherein the non-nucleotidic linker is an alkyl linker or amino linker, wherein the alkyl or amino linker may be optionally branched or unbranched, cyclic or acyclic, substituted or unsubstituted, saturated or unsaturated, chiral, achiral or racemic mixture.

5. The agonist according to claim 4 , wherein the alkyl linker has from about 2 to about 18 carbon atoms.

6. The agonist according to claim 4 , wherein the alkyl linker has from about 3 to about 9 carbon atoms.

7. The agonist according to claim 4 , wherein the alkyl linker is 1,2,3-Propanetriol, glycerol, 1,2,4-Butanetriol, 2-Hydroxymethyl-1,3-proanediol, 1,1,1-Tris(hydroxymethyl)ethane, 2-Amino-2-(hydroxymethyl)1,3-proanediol, tris(hydroxymethyl)nitromethane, 1,1,1-Tri(hydroxymethyl)propane, 1,2,6-Hexanetriol, 1,3,5-Hexanetriol, 1,3,5-Pentanetriol, 3-Methyl-1,3,5-pentanetriol, 1,2,3-Heptanetriol, 2-(Hydroxymethyl)1,4-butanediol, 1,3-Di(hydroxymethyl)phenol, 1,3,5-Tri(hydroxymethyl)benzene, 1,3-Di(hydroxyethoxy)-2-hydroxy-propane, 1,3-Di(hydroxypropoxy)-2-hydroxy-propane, D-Galactal, 1,3,5-Tris(2-hydroxyethyl)cyanuric acid or 1,3,5-Tris(4-hydroxyphenyl)benzene.

8. The agonist according to claim 1 , wherein the oligoribonucleotides comprises modified ribonucleotides.

9. The agonist according to claim 8 , wherein the modified ribonucleotides are 7-deaza-G, ara-G, 6-thio-G, Inosine, Iso-G, loxoribine, TOG(7-thio-8-oxo)-G, 8-bromo-G, 8-hydroxy-G, 5-aminoformycin B, Oxoformycin, 7-methyl-G, 9-p-chlorophenyl-8-aza-G, 9-phenyl-G, 9-hexyl-guanine, 7-deaza-9-benzyl-G, 6-Chloro-7-deazaguanine, 6-methoxy-7-deazaguanine, 8-Aza-7-deaza-G(PPG), 2-(Dimethylamino)guanosine, 7-Methyl-6-thioguanosine, 8-Benzyloxyguanosine, 9-Deazaguanosine, 9-benzyl-8-hydroxy-2-(2-methoxyethoxy)adenine, 2-Amino-N2-O—, methyladenosine, 8-Aza-7-deaza-A, 7-deaza-A, Vidarabine, 2-Aminoadenosine, N1-Methyladenosine, 8-Azaadenosine, 5-Iodotubercidin, 1-(B-D-ribofuranosyl)-2-oxo-7-deaza-8-methyl-purine or 4-thio-U, or combinations thereof.

10. The agonist according to claim 1 , further comprising a 5′ cap.

11. The agonist according to claim 10 , wherein the 5′ cap is a non-nucleotidic linker.

12. The agonist according to claim 1 , wherein each of the single-stranded oligoribonucleotides is 8, 9, 10, 11, 14, or 17 ribonucleotides in length.

13. The agonist according to claim 1 , wherein each of the single-stranded oligoribonucleotides is 11 ribonucleotides in length.

14. The agonist according to claim 1 , wherein the agonist is:

(a) 5′-UG 1 CUG 1 CUUCUG 1 -X-G 1 UCUUCG 1 UCG 1 U-5′; (5′-SEQ ID NO: 11-3′-X-3′-SEQ ID NO: 11-5′; SIMRA #11)

(b) 5′-X 2 UGCUGCUUGUG-X-GUGUUCGUCGUX 2 -5′; (5′-X 2 SEQ ID NO: 30-3′-X-3′-SEQ ID NO: 30X 2 -5′; SIMRA #30)

(c) 5′-X 3 UGCUGCUGCUG-X-GUCGUCGUCGUX 3 -5′; (5′-X 3 SEQ ID NO: 41-3′-X-3′-SEQ ID NO: 41X 3 -5′; SIMRA #41)

(d) 5′-UG 1 CUG 1 CUUCUG 1 -X 1 -G 1 UCUUCG 1 UCG 1 U-5′; (5′-SEQ ID NO: 55-3′-X 1 -3′-SEQ ID NO: 55-5′; SIMRA #55)

(e) 5′-UUG 1 CUG 1 UUG 1 CU-X-UCG 1 UUG 1 UCG 1 UU-5′; (5′-SEQ ID NO: 65-3′-X-3′-SEQ ID NO: 65-5′; SIMRA #65)

(f) 5′-UG 1 CCUUG 1 AACU-X-UCAAG 1 UUCCG 1 U-5′; (5′-SEQ ID NO: 66-3′-X-3′-SEQ ID NO: 66-5′; SIMRA #66)

(g) 5′-G 1 UCCUUG 1 CUUG 1 -X-G 1 UUCG 1 UUCCUG 1 -5′; (5′-SEQ ID NO: 105-3′-X-3′-SEQ ID NO: 105-5′; SIMRA #105)

(h) 5′-X 2 G 1 UCCUUG 1 CUUG 1 -X-G 1 UUCG 1 UUCCUG 1 X 2 -5′; (5′-X 2 SEQ ID NO: 109-3′-X-3′-SEQ ID NO: 109X 2 -5′; SIMRA #109)

(i) 5′-UG 1 CUG 1 CCUUUG 1 -X-G 1 UUUCCG 1 UCG 1 U-5′; (5′-SEQ ID NO: 110-3′-X-3′-SEQ ID NO: 110-5′; SIMRA #110) or

(j) 5′-G 1 UCCUUUG 1 CUG 1 -X 9 -G 1 UCG 1 UUUCCUG 1 -5′; (5′-SEQ ID NO: 113-3′-X 9 -3′-SEQ ID NO: 113-5′; SIMRA #113);

wherein G 1 is 7-deaza-G, X is glycerol, X 2 is a C3 linker or propanediol, X 1 is 1,3,5-pentanetriol, X 3 is a C3 linker or propanediol, X 9 is cis, trans-cyclohexanetriol.