INHIBITION OF TISSUE FACTOR PATHWAY INHIBITOR WITH FACTOR XA DERIVATIVES
The present disclosure relates to compositions and methods for the treatment of bleeding disorders, such as hemophilia A, hemophilia B, von Willebrand (vWF) disease, and factor XII deficiency, by reducing the circulating concentration of tissue factor pathway inhibitor (TFPI), with a factor Xa derivative.
1 . A method for treating a bleeding disorder in a subject in need thereof, comprising administering to the subject an effective amount of a polypeptide factor Xa (fXa) derivative (a) that comprises a fXa heavy chain that comprises a modification at an active site and (b) that does not include a light chain or comprises a Gla-deficient or des-Gla fXa light chain.
2 . The method of claim 1 , wherein the bleeding disorder is selected from the group consisting of hemophila A, hemophilia B, a von Willebrand (vWF) disease, a factor XII deficiency and combinations thereof.
3 . A method for improving blood clotting in a subject in need thereof, comprising administering to the subject an effective amount of a polypeptide factor Xa (fXa) derivative (a) that comprises a fXa heavy chain that comprises a modification at an active site and (b) that does not include a light chain or comprises a Gla-deficient or des-Gla fXa light chain.
4 . A method for reducing the concentration of circulating tissue factor pathway inhibitor (TFPI) in a subject in need thereof, comprising administering to the subject an effective amount of a polypeptide factor Xa (fXa) derivative (a) that comprises a fXa heavy chain that comprises a modification at an active site and (b) that does not include a light chain or comprises a Gla-deficient or des-Gla fXa light chain.
5 . The method of claim 4 , wherein the subject suffers from a bleeding disorder.
6 . The method of claim 4 , wherein the subject is experiencing or at risk of experiencing a bleeding episode.
7 . The method of claim 1 , wherein the modification comprises substitution of Ser379 with dehydro-alanine or alanine.
8 . The method of claim 1 , wherein the modification comprises substitution of His236 with alanine and/or substitution of Asp282 with alanine or asparagine.
9 . The method of claim 7 , wherein the fXa heavy chain further comprises at least one amino acid substitution at amino acid position Arg306, Glu310, Arg347, Lys351, Lys414, or Arg424.
10 . The method of claim 1 , wherein the polypeptide comprises a peptide linker between the light chain and the heavy chain.
11 . The method of claim 1 , wherein the polypeptide is a two-chain polypeptide.
12 . The method of claim 1 , wherein the polypeptide comprises the amino acid sequence of SEQ ID NO. 3 or 7 or an amino acid sequence having at least 90% sequence identity to SEQ ID NO. 3 or 7, wherein the polypeptide (a) has reduced procoagulant activity compared to wild-type factor Xa and (b) does not assemble into a prothrombinase complex.
13 . The method of claim 1 , further comprising administering to the subject an agent selected from the group consisting of BAX499, ARC19499, mAb2021, NASP and combinations thereof.
14 . The method of claim 1 , further comprising administering to the subject a recombinant fVIII or fIX.
15 . The method of claim 1 , wherein the derivative is conjugated with a moiety capable of extending the circulating half-life of the derivative.