Toll-like receptor 3 antagonists
Toll Like Receptor 3 (TLR3) antibody antagonists, polynucleotides encoding TLR3 antibody antagonists or fragments thereof, and methods of making and using the foregoing are disclosed.
1. An isolated antibody or fragment thereof that binds toll-like receptor 3 (TLR3), wherein the antibody binds at least one TLR3 amino acid residue selected from the group consisting of residues K467, R488 and R489 of SEQ ID NO: 2.
2. The isolated antibody or fragment of claim 1 , wherein the TLR3 amino acid residues are selected from the group consisting of:
a) residue K467 of SEQ ID NO: 2;
b) residue R489 of SEQ ID NO: 2;
c) residues K467 and R489 of SEQ ID NO: 2; and
d) residues K467, R488, and R489 of SEQ ID NO: 2.
3. The isolated antibody or fragment of claim 1 , wherein the antibody further binds at least one TLR3 amino acid residue selected from the group consisting of residues Y465, Y468, N517, D536, Q538, H539, N541, E570 and K619 of SEQ ID NO:2.
4. An isolated antibody or fragment thereof that binds toll-like receptor 3(TLR3), wherein the antibody has at least one of the following properties:
a) reduces human TLR3 biological activity in an in vitro poly(I:C) NF-κB reporter gene assay >50% at <1 μg/ml;
b) inhibits >60% of IL-6 or CXCL10/IP-10 production from BEAS-2B cells stimulated with <100 ng/ml poly(I:C) at <10 μg/ml;
c) inhibits >50% of IL-6 or CXCL10/IP-10 production from BEAS-2B cells stimulated with <100 ng/ml poly(I:C) at <0.4 μg/ml;
d) inhibits >50% of IL-6 production from NHBE cells stimulated with 62.5 ng/ml poly(I:C) at <5 μg/ml;
e) inhibits >50% of IL-6 production from NHBE cells stimulated with 62.5 ng/ml poly(I:C)at <1 μg/ml;
f) inhibits >20% of poly(I:C)-induced IFN-γ, IL-6 or IL-12 production by PBMC at <1 μg/ml;
g) inhibits cynomologus TLR3 biological activity in an in vitro NF-κB reporter gene assay with IC50 <10 μg/ml; or
h) inhibits cynomologus TLR3 biological activity in an in vitro ISRE reporter gene assay with IC50<5μg/ml.
5. An isolated monoclonal antibody or fragment reactive with TLR3 that competes for TLR3 binding with a monoclonal antibody comprising:
a) the heavy chain variable region of SEQ ID NO: 216 and the light chain variable region of SEQ ID NO: 41; or
the heavy chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 82, 86 and 84 and the light chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 79, 80 and 87.
6. An isolated antibody or fragment reactive with TLR3 comprising both a heavy chain and a light chain variable region and wherein the antibody comprises:
a) the heavy chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 82, 196 and 84, wherein the HCDR2 of SEQ ID NO: 196 is further defined as shown in Formula (V):
Xaa 24 -I-D-P-S-D-S-Y-T-N-Y-Xaa 25 -P-S-F-Q-G, (V)
wherein
Xaa 24 may be Phe or Arg; and
Xaa 25 may be Ala or Ser; and
b) the light chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 79, 80 and 195, wherein the LCDR3 of SEQ ID NO: 195 is further defined as shown in Formula (VI):
Q-Q-Xaa 18 -Xaa 19 -Xaa 20 -Xaa 21 -Xaa 22 -Xaa 23 -T, (VI)
wherein
Xaa l8 may be Tyr, Gly or Ala;
Xaa 19 may be Gly, Glu or Asn;
Xaa 20 may be Ser or Thr;
Xaa 21 may be Val, Ile or Leu;
Xaa 22 may be Ser or Leu; and
Xaa 23 may be Ile, Ser, Pro or Tyr.
7. An isolated antibody or fragment reactive with TLR3 comprising both a heavy chain and a light chain variable region and wherein the antibody comprises:
the heavy chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 82, 86 and 84 and the light chain CDR 1, 2 and 3 amino acid sequences as shown in SEQ ID NOs: 79, 80 and 87.
8. An isolated antibody or fragment reactive with TLR3 comprising both a heavy chain and a light chain variable region and wherein the antibody comprises:
a) the heavy chain variable region of SEQ ID NO: 216; or
b) the light chain variable region of SEQ ID NO: 41; or
c) the heavy chain variable region of SEQ ID NO: 216 and the light chain variable region of SEQ ID NO: 41; or
d) the heavy chain of SEQ ID NO: 220; or
e) the light chain of SEQ ID NO: 156; or
f) the heavy chain of SEQ ID NO: 220 and the light chain of SEQ ID NO: 156.
9. The isolated antibody or fragment of claim 1 , 4 , 5 or 6 , wherein the antibody is fully human or human-adapted.
10. The isolated antibody or fragment of claim 9 , wherein the antibody is conjugated to polyethylene glycol.
11. The isolated antibody or fragment of claim 9 , having an IgG4 isotype.
12. The isolated antibody or fragment of claim 9 , wherein the Fc domain comprises S229P, P235A or L236A mutations.
13. A pharmaceutical composition comprising the isolated antibody or fragment of claim 9 and a pharmaceutically acceptable carrier.
14. An isolated antibody heavy chain comprising the amino acid sequence shown in SEQ ID NO: 216.
15. An isolated antibody light chain comprising the amino acid sequence shown in SEQ ID NO: 41.
16. An isolated antibody heavy chain comprising the amino acid sequence shown in SEQ ID NO: 220.
17. An isolated antibody light chain comprising the amino acid sequence shown in SEQ ID NO: 156.