TFPI inhibitors and methods of use
The invention provides peptides that bind Tissue Factor Pathway Inhibitor (TFPI), including TFPI-inhibitory peptides, and compositions thereof. The peptides may be used to inhibit a TFPI, enhance thrombin formation in a clotting factor-deficient subject, increase blood clot formation in a subject, treat a blood coagulation disorder in a subject, purify TFPI, an identify a TFPI-binding compound.
1. A peptide comprising (a) an amino acid sequence having at least 80% identity to SYYKWH[CA-Moo-RDLKGTFTC]VWVKF (SEQ ID NO: 1334) or (b) a variant of SEQ ID NO: 1334, wherein the variant comprises one or two amino acid substitution(s), deletion(s) or insertion(s).
2. The peptide of claim 1 , further comprising N-terminal amino acid(s) and/or moieties selected from the group consisting of FAM-Ttds, PE, Palm, 2-phenyl acetyl, 3-phenyl propionyl, 2-(naphtha-2-yl)acetyl, hexanoyl, 2-methyl propionyl, 3-methyl butanoyl, 2-naphthylsulfonyl, and 1-naphthylsulfonyl.
3. The peptide of claim 1 , further comprising C-terminal amino acid(s) and/or moieties selected from the group consisting of C, c, C(NEM), K(Ttds-maleimidopropionyl(EtSH)), FA19205, FA19204, FA19203, FA03202, K(Tdts-maleimide), K(AOA), and Cea.
4. The peptide of claim 1 , wherein the IC50 of the peptide is less than 250 nM or less than 50 nM and wherein the peptide comprises a disulfide bond between two cysteine residues.
5. The peptide of claim 1 , wherein the peptide inhibits TFPI activity and binds to TFPI 1-alpha with a dissociation constant of less than 10 μM and wherein the peptide comprises a disulfide bond between two cysteine residues.
6. The peptide of claim 1 , operably linked to a moiety that enhances the half-life of the peptide.
7. The peptide of claim 1 , wherein the peptide is conjugated to a polyethylene glycol (PEG) moiety, human serum albumin (HSA), an antibody or fragment thereof, hydroxyethyl starch, a multimer comprising proline, alanine, serine, or a combination thereof (PASylation), or a C12-C18 fatty acid.
8. The peptide of claim 1 , wherein the peptide comprises 90% identity to SEQ ID NO: 1334.
9. The peptide of claim 8 , wherein the peptide comprises SEQ ID NO: 1334.
10. The peptide of claim 8 , wherein the peptide consists of SEQ ID NO: 1334.
11. A TFPI-binding peptide comprising a homo-dimer, homo-multimer, hetero-dimer, or hetero-multimer of one or more peptides of claim 1 .
12. A pharmaceutical composition for treating a subject suffering from a blood coagulation disorder or at risk of suffering from a blood coagulation disorder, comprising the peptide according to claim 1 .
13. A pharmaceutical composition comprising the peptide of claim 1 and a pharmaceutically acceptable carrier.
14. A peptide complex comprising (i) the peptide of claim 1 and (ii) another peptide linked to the peptide of (i).
15. The peptide complex of claim 14 wherein peptide (i) is linked to peptide (ii) via a multimerization domain or chemical linkage.
16. The peptide complex of claim 14 , further comprising at least one moiety for improving peptide half life.
17. A pharmaceutical composition comprising the peptide complex of claim 14 for use in treating a subject suffering from a blood coagulation disorder or at risk of suffering from a blood coagulation disorder.