US20050147618A1 - Clotting factor-Fc chimeric proteins to treat hemophilia - Google Patents

Clotting factor-Fc chimeric proteins to treat hemophilia Download PDF

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US20050147618A1
US20050147618A1 US10/841,819 US84181904A US2005147618A1 US 20050147618 A1 US20050147618 A1 US 20050147618A1 US 84181904 A US84181904 A US 84181904A US 2005147618 A1 US2005147618 A1 US 2005147618A1
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factor
chimeric protein
clotting
constant region
immunoglobulin
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Daniel Rivera
Robert Peters
Alan Bitonti
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Bioverativ Therapeutics Inc
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Syntonix Pharmaceuticals Inc
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Application filed by Syntonix Pharmaceuticals Inc filed Critical Syntonix Pharmaceuticals Inc
Priority to US10/841,819 priority Critical patent/US20050147618A1/en
Publication of US20050147618A1 publication Critical patent/US20050147618A1/en
Assigned to SYNTONIX PHARMACEUTICALS, INC. reassignment SYNTONIX PHARMACEUTICALS, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RIVERA, DANIEL S., BITONTI, ALAN J., PETERS, ROBERT T.
Assigned to BIOGEN IDEC INC. reassignment BIOGEN IDEC INC. SECURITY AGREEMENT Assignors: SYNTONIX PHARMACEUTICALS, INC.
Assigned to SYNTONIX PHARMACEUTICALS, INC. reassignment SYNTONIX PHARMACEUTICALS, INC. RELEASE & REASSIGNMENT Assignors: BIOGEN IDEC INC.
Priority to US12/949,564 priority patent/US8449884B2/en
Priority to US13/792,889 priority patent/US8815250B2/en
Assigned to BIOGEN IDEC HEMOPHILIA INC. reassignment BIOGEN IDEC HEMOPHILIA INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: SYNTONIX PHARMACEUTICALS, INC.
Priority to US14/334,396 priority patent/US20150044207A1/en
Assigned to BIOVERATIV THERAPEUTICS INC. reassignment BIOVERATIV THERAPEUTICS INC. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: BIOGEN HEMOPHILIA INC.
Priority to US15/866,203 priority patent/US20180237762A1/en
Priority to US17/239,208 priority patent/US20210348150A1/en
Abandoned legal-status Critical Current

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    • C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424—Serine endopeptidases (3.4.21)
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    • A61K38/17—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • A61K38/36—Blood coagulation or fibrinolysis factors
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    • A61K47/68—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment
    • A61K47/6835—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an antibody, an immunoglobulin or a fragment thereof, e.g. an Fc-fragment the modifying agent being an antibody or an immunoglobulin bearing at least one antigen-binding site
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    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/435—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from animals; from humans
    • C07K14/745—Blood coagulation or fibrinolysis factors
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
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    • C12N9/14—Hydrolases (3)
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    • C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424—Serine endopeptidases (3.4.21)
    • C12N9/644—Coagulation factor IXa (3.4.21.22)
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    • C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
    • C12N9/14—Hydrolases (3)
    • C12N9/48—Hydrolases (3) acting on peptide bonds (3.4)
    • C12N9/50—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25)
    • C12N9/64—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue
    • C12N9/6421—Proteinases, e.g. Endopeptidases (3.4.21-3.4.25) derived from animal tissue from mammals
    • C12N9/6424—Serine endopeptidases (3.4.21)
    • C12N9/6454—Dibasic site splicing serine proteases, e.g. kexin (3.4.21.61); furin (3.4.21.75) and other proprotein convertases
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    • C12Y—ENZYMES
    • C12Y304/00—Hydrolases acting on peptide bonds, i.e. peptidases (3.4)
    • C12Y304/21—Serine endopeptidases (3.4.21)
    • C12Y304/21021—Coagulation factor VIIa (3.4.21.21)
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
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    • A61K2039/60—Medicinal preparations containing antigens or antibodies characteristics by the carrier linked to the antigen
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2319/00—Fusion polypeptide
    • C07K2319/30—Non-immunoglobulin-derived peptide or protein having an immunoglobulin constant or Fc region, or a fragment thereof, attached thereto

Definitions

  • the invention relates generally to the field of therapeutics for hemostatic disorders. More specifically, the invention relates to a chimeric protein for the treatment of a hemostatic disorder.
  • Hemostatic disorders are characterized by uncontrolled bleeding resulting from the inability or reduced ability to form fibrin clots. Hemostatic disorders can result from a genetic defect or can be acquired as a result of an unrelated medical condition (e.g., cancer and related chemotherapy, autoimmune disease) (Kasper 2000, Hemophilia 6(Supp):13; Cohen et al. 1996, Bailiere's Clinical Hematology 9(2):331). Typically, hemostatic disorders result from the deficiency of a specific blood clotting factor.
  • an unrelated medical condition e.g., cancer and related chemotherapy, autoimmune disease
  • hemostatic disorders include hemophilia A, which results from a deficiency in factor VIII; hemophilia B (Christmas Disease), which results from a deficiency in factor IX; and von Willebrand's disease, which results in a defect in von Willebrand's factor.
  • Von Willebrand factor circulates in association with factor VIII and stabilizes it. It mediates the adherence of platelets to each other and to injured blood vessel walls.
  • factor XI deficiency PTA deficiency
  • factor XII deficiency As well as deficiencies or structural abnormalities in fibrinogen, prothrombin, factor V, factor VII, factor X, or factor XII (Kasper 2000, Hemophilia 6(Supp): 13).
  • Clotting factors act in concert with one another in a coagulation cascade that ultimately results in the formation of a fibrin clot ( FIG. 1 ). These factors can exist in a quiescent state as a proenzyme or zymogen or in an activated enzymatic state when stimulated to form a clot. Stimulation of these factors can occur by two distinct pathways, the intrinsic pathway and the extrinsic pathway.
  • the intrinsic pathway refers to those reactions that lead to clot formation through utilization of factors present only in the plasma.
  • the extrinsic pathway refers to those reactions that lead to clot formation from release of membrane bound tissue factor upon vessel endothelium disruption.
  • Factor VII participates in both pathways cleaving factor X into the activated factor Xa in conjunction with tissue factor in the extrinsic pathway or interacting with factor IXa in the intrinsic pathway. Factor VII acts down stream and independently of factors VII and IX when acting through the extrinsic pathway, thus bypassing the need for these clotting factors. It is, therefore, an attractive therapeutic candidate for treating hemostatic disorders, especially Hemophilia A and B. (U.S. Pat. No. 6,310,183; WO 01/58935).
  • Factor VII is a vitamin K-dependent plasma protein synthesized in the liver and secreted into the blood as a single-chain glycoprotein with a molecular weight of 53 kDa (Broze et al. 1980, J. Biol. Chem. 255:1242).
  • the factor VII zymogen is converted into an activated form (FVIIa) by proteolytic cleavage at a single site, Arg152-IIe153, resulting in two chains, heavy (254 amino acids) and light (154 amino acids) linked by a single disulfide bond (Hagen et al. 1986, Proc. Natl. Acad. Sci. (USA) 83:2412).
  • factor VII binds to tissue factor, which then converts factor X to factor Xa.
  • Factor Xa is required to convert prothrombin to thrombin, which converts fibrinogen to fibrin as a final stage in forming a fibrin clot.
  • Factor VII undergoes post-translational modifications, including vitamin K dependent carboxylation resulting in ten ⁇ -carboxyglutamic acid residues in the N-terminal region of the molecule.
  • Other post translational modifications include sugar moiety attachment at two naturally occurring N-linked glycosylation sites at position 145 and 322, respectively, and at two naturally occurring O-linked glycosylation sites at position 52 and 60, respectively (WO 01/58935).
  • clotting factors must be administered parenterally in order to attain effective doses because to date non-invasive methods have not been successful in attaining therapeutic levels. Problems associated with parenteral administration include injection site occlusion, pain and infection. Use of an in-line catheter increases the risk of all of these events. Specific problems associated with the parenteral administration of clotting factors to infants and small children include central venous access. Additionally, parenteral administration of clotting factors runs the risk of precipitating a bleeding episode. These problems are particularly relevant when the patient is undergoing regular prophylactic administration of a clotting factor.
  • Clotting factors such as factor IX and factor VIII must be given frequently and in large doses resulting in the development of inhibitor antibodies against the clotting factor in a significant number of patients (see, e.g., Nilsson 1992, Transfusion Medicine Review 6(4):285; Cohen et al. 1996, Bailiere's Clinical Hematology 9(2):331).
  • One aspect of the invention provides a safer more effective treatment for hemostatic disorders.
  • Another aspect of the invention provides for increased serum half life and increased bioavailability of therapeutics administered through non-invasive means for the treatment of hemostatic disorders thereby reducing the risk of incurring a bleeding episode, infection and injection site occlusion associated with parenteral administration.
  • Another aspect of the invention provides therapy for hemostatic disorders with reduced risk, compared to current therapies, of developing inhibitor antibodies against the clotting factor.
  • Yet another aspect of the invention provides for a prophylactic treatment of a hemostatic disorder.
  • the aspects of the invention provide for a chimeric protein comprised of at least one clotting factor and at least a portion of an immunoglobulin constant region, wherein the clotting factor is capable of promoting blood coagulation and/or fibrin clot formation.
  • Chimeric proteins comprising an Fc portion of an immunoglobulin are known (see, e.g., U.S. Pat. Nos. 6,030,613, 6,086,875, 6,485,726, and PCT Application No. US/02/21335) and while chimeric proteins comprised of mutant clotting factors without clotting activity, and immunoglobulins have been previously described (WO 01/02439), chimeric proteins comprising a clotting factor (i.e., having clotting activity) and at least a portion of an immunoglobulin constant region have not been described.
  • Clotting factor as defined below and used herein refers to any molecule with clotting activity.
  • the invention relates to an improved chimeric protein for treating hemostatic disorders.
  • the invention provides a chimeric protein to treat a hemostatic disorder that can be administered parenterally or non-invasively (e.g., via a pulmonary, nasal, or oral route).
  • the invention thus relates to a chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • the invention relates to a method of treating a hemostatic disorder comprising administering a therapeutically effective amount of a chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • the invention relates to a method of making a chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region; said method comprising transfecting a cell with a DNA construct comprising a first DNA sequence encoding at least one clotting factor operatively linked to a second DNA sequence encoding at least a portion of an immunoglobulin.; culturing said cell under conditions such that the chimeric protein is expressed; and isolating said chimeric protein from said cell.
  • the invention relates to a nucleic acid molecule comprising a sequence encoding at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • the invention relates to a nucleic acid construct comprising a DNA sequence encoding at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • FIG. 1 is a diagram showing the extrinsic and intrinsic pathway of the coagulation cascade.
  • FIG. 2 is a diagram of the inactive and active forms of factor VIIa-Fc.
  • FIG. 3A is the amino acid sequence of a chimeric protein comprising factor VIIa and an Fc fragment of an immunoglobulin (SEQ ID NO:1).
  • FIG. 3B is the amino acid sequence of an Fc fragment of an immunoglobulin (SEQ ID NO:2).
  • FIG. 3C is the nucleic acid sequence of an Fc fragment of an immunoglobulin (SEQ ID NO:3).
  • FIG. 3D is the nucleic acid sequence of a chimeric protein comprising factor VIIa and an Fc fragment of an immunoglobulin (SEQ ID NO:4).
  • FIG. 4 is a diagram of results from a STA-CLOT assay showing factor VIIa-Fc has significant clotting activity.
  • FIG. 5 is a diagram showing factor VIIa-Fc binds to soluble human Fc neonatal receptor (shFcRn).
  • FIG. 6 demonstrates plasma levels over time for orally administered factor VIIa-Fc in neonatal rats.
  • FIG. 7 compares oral uptake in neonatal rats of Factor VIIa-Fc monomer/dimer hybrids comprising two polypeptide chains, each chain comprising at least a portion of an immunoglobulin constant region and wherein factor VII is linked to only one of the two chains versus homodimers comprising two polypeptide chains wherein both chains comprise at least a portion of an immunoglobulin constant region and both chains also comprise factor VII.
  • FIG. 8A demonstrates plasma levels over time of factor VIIa-Fc administered intravenously to minipigs, wherein the factor VIIa-Fc is a monomer/dimer hybrid comprising two polypeptide chains, each chain comprising at least a portion of an immunoglobulin constant region and wherein factor VII is linked to only one of the two chains.
  • FIG. 8B demonstrates clotting activity over time of factor VIIa-Fc administered intravenously to minipigs wherein the factor VIIa-Fc is a monomer/dimer hybrid comprising two polypeptide chains, each chain comprising at least a portion of an immunoglobulin constant region and wherein factor VII is linked to only one of the two chains.
  • FIG. 9A is the amino acid sequence of the chimeric protein Factor IX-Fc. Included in the sequence is the signal peptide (underlined) which is cleaved by the cell and the propeptide (bold) which is recognized by the vitamin K-dependent ⁇ carboxylase which modifies the Factor IX to achieve full activity. The sequence is subsequently cleaved by PACE to yield Factor IX-Fc.
  • FIG. 9B is the nucleic acid sequence of the chimeric protein Factor IX-Fc. Included in the sequence is the signal peptide (underlined) and the propeptide (bold) which is recognized by the vitamin K-dependent ⁇ carboxylase which modifies the Factor IX to achieve full activity. The translated sequence is subsequently cleaved by PACE to yield mature Factor IX-Fc.
  • Seq ID NO FIG. Description 1 3A amino acid sequence of a chimeric protein comprising factor VIIA and an IgG FC fragment 2 3B amino acid sequence of an FC fragment of IgG 3 3C nucleic acid sequence corresponding to the amino acid sequence of SEQ ID NO: 2 4 3D nucleic acid sequence corresponding to the amino acid sequence of SEQ ID NO: 1
  • Affinity tag means a molecule attached to a second molecule of interest, capable of interacting with a specific binding partner for the purpose of isolating or identifying said second molecule of interest.
  • Analogs of, or proteins or peptides or substantially identical to the chimeric proteins of the invention, as used herein, means that a relevant amino acid sequence of a protein or a peptide is at least 70%, 75%, 80%, 85%, 90%, 95%, 97%, 98%, 99%, or 100% identical to a given sequence.
  • sequences may be variants derived from various species, or they may be derived from the given sequence by truncation, deletion, amino acid substitution or addition. Percent identity between two amino acid sequences is determined by standard alignment algorithms such as, for example, Basic Local Alignment Tool (BLAST) described in Altschul et al. (1990) J. Mol.
  • BLAST Basic Local Alignment Tool
  • BLAST 2 Sequences program BLASTN, reward for match 2, penalty for mismatch ⁇ 2, open gap and extension gap penalties 5 and 2 respectively, gap x_dropoff 50, expect 10, word size 11, filter ON.
  • program BLASTP program BLASTP, matrix BLOSUM62, open gap and extension gap penalties 11 and 1 respectively, gap x_dropoff 50, expect 10, word size 3, filter ON.
  • Bioavailability means the extent and rate at which a substance is absorbed into a living system or is made available at the site of physiological activity.
  • a chimeric protein refers to any protein comprised of a first amino acid sequence derived from a first source, bonded, covalently or non-covalently, to a second amino acid sequence derived from a second source, wherein the first and second source are not the same.
  • a first source and a second source that are not the same can include two different biological entities, or two different proteins from the same biological entity, or a biological entity and a non-biological entity.
  • a chimeric protein can include for example, a protein derived from at least 2 different biological sources.
  • a biological source can include any non-synthetically produced nucleic acid or amino acid sequence (e.g.
  • a synthetic source can include a protein or nucleic acid sequence produced chemically and not by a biological system (e.g. solid phase synthesis of amino acid sequences).
  • a chimeric protein can also include a protein derived from at least 2 different synthetic sources or a protein derived from at least one biological source and at least one synthetic source.
  • Clotting factor means any molecule, or analog thereof, naturally occurring or recombinantly produced which prevents or decreases the duration of a bleeding episode in a subject with a hemostatic disorder. In other words, it means any molecule having clotting activity.
  • Clotting activity means the ability to participate in a cascade of biochemical reactions that culminates in the formation of a fibrin clot and/or reduces the severity, duration or frequency of hemorrhage or bleeding episode.
  • DNA construct means a DNA molecule, or a clone of such a molecule, either single- or double-stranded that has been modified through human intervention to contain segments of DNA combined in a manner that as a whole would not otherwise exist in nature.
  • DNA constructs contain the information necessary to direct the expression of polypeptides of interest.
  • DNA constructs can include promoters, enhancers and transcription terminators.
  • DNA constructs containing the information necessary to direct the secretion of a polypeptide will also contain at least one secretory signal sequence.
  • a fragment refers to a peptide or polypeptide comprising an amino acid sequence of at least 2 contiguous amino acid residues, of at least 5 contiguous amino acid residues, of at least 10 contiguous amino acid residues, of at least 15 contiguous amino acid residues, of at least 20 contiguous amino acid residues, of at least 25 contiguous amino acid residues, of at least 40 contiguous amino acid residues, of at least 50 contiguous amino acid residues, of at least 100 contiguous amino acid residues, or of at least 200 contiguous amino acid residues or any deletion or truncation of a protein.
  • Hemostasis means the stoppage of bleeding or hemorrhage; or the stoppage of blood flow through a blood vessel or body part.
  • Hemostatic disorder means a genetically inherited or acquired condition characterized by a tendency to hemorrhage, either spontaneously or as a result of trauma, due to an impaired ability or inability to form a fibrin clot.
  • Linked refers to a first nucleic acid sequence covalently joined to a second nucleic acid sequence.
  • the first nucleic acid sequence can be directly joined or juxtaposed to the second nucleic acid sequence or alternatively an intervening sequence can covalently join the first sequence to the second sequence.
  • Linked as used herein can also refer to a first amino acid sequence covalently joined to a second amino acid sequence.
  • the first amino acid sequence can be directly joined or juxtaposed to the second amino acid sequence or alternatively an intervening sequence can covalently join the first amino acid sequence to the second amino acid sequence.
  • Linked can also refer to a first amino acid sequence non-covalently joined to a second amino acid sequence.
  • Linked as used herein can also refer to a first amino acid sequence covalently joined to a nucleic acid sequence or a small organic or inorganic molecule.
  • Operatively linked means a first nucleic acid sequence linked to a second nucleic acid sequence such that both sequences are capable of being expressed as a biologically active polypeptide.
  • a small inorganic molecule means a molecule containing no carbon atoms and being no larger than 50 kD.
  • a small organic molecule means a molecule containing at least one carbon atom and being no larger than 50 kD.
  • High stringency includes conditions readily determined by the skilled artisan based on, for example, the length of the DNA. Generally, such conditions are defined as hybridization conditions as above, and with washing at approximately 68° C., 0.2 ⁇ SSC, 0.1% SDS. The skilled artisan will recognize that the temperature and wash solution salt concentration can be adjusted as necessary according to factors such as the length of the probe.
  • Moderate stringency include conditions that can be readily determined by those having ordinary skill in the art based on, for example, the length of the DNA.
  • the basic conditions are set forth by Sambrook et al. Molecular Cloning: A Laboratory Manual, 2 ed. Vol. 1, pp. 1.101-104, Cold Spring Harbor Laboratory Press (1989), and include use of a prewashing solution for the nitrocellulose filters 5 ⁇ SSC, 0.5% SDS, 1.0 mM EDTA (pH 8.0), hybridization conditions of 50% formamide, 6 ⁇ SSC at 42° C. (or other similar hybridization solution, such as Stark's solution, in 50% formamide at 42° C.), and washing conditions of 60° C., 0.5 ⁇ SSC, 0.1 % SDS.
  • Polypeptide refers to a polymer of amino acids and does not refer to a specific length of the product; thus, peptides, oligopeptides, and proteins are included within the definition of polypeptide. This term does not exclude post-expression modifications of the polypeptide, for example, glycosylation, acetylation, phosphorylation, pegylation, addition of a lipid moiety, or the addition of any organic or inorganic molecule. Included within the definition, are for example, polypeptides containing one or more analogs of an amino acid (including, for example, unnatural amino acids) and polypeptides with substituted linkages, as well as other modifications known in the art, both naturally occurring and non-naturally occurring.
  • Treat, treatment, treating means any of the following: the reduction in severity of a hemostatic disorder; the prophylaxis of one or more symptoms associated with a hemostatic disorder, e.g., a bleeding episode; the reduction in the duration of a disease course of a hemostatic disorder; the amelioration of one or more symptoms associated with a hemostatic disorder; the reduction in duration of a bleeding episode associated with a hemostatic disorder; the reduction in the titer of an inhibitor antibody against a clotting factor; the provision of beneficial effects to a subject with a hemostatic disorder, without necessarily curing the hemostatic disorder.
  • the invention relates generally to improved therapeutics for hemostatic disorders.
  • the invention thus relates to a chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • the chimeric proteins of the invention have increased stability and other improved properties when compared to known therapeutic agents having clotting activity. They can also be administered parenterally or non-invasively. Accordingly, the invention provides for improved methods for administering therapeutic agents having clotting activity. While clotting factors presently are generally administered subcutaneously, intramuscularly or intravenously, the chimeric proteins of the invention can be administered using less invasive means such as oral administration, nasal administration, or pulmonary administration. In a specific embodiment, the chimeric proteins of the invention are useful in the prophylactic treatment of hemostatic disorders.
  • the invention also relates generally to improved methods of making therapeutic clotting factors.
  • the invention relates to recombinant methods of producing therapeutic clotting factors with enhanced expression and improved yields.
  • the invention thus relates to methods of making chimeric proteins comprising at least one clotting factor and at least a portion of an immunoglobulin constant region by transfecting a cell with a DNA construct, said construct comprising a DNA sequence encoding at least one clotting factor and a DNA sequence encoding at least a portion of an immunoglobulin constant region; culturing said cell under conditions such that the chimeric protein is expressed by said cell; and isolating said chimeric protein.
  • the invention relates generally to chimeric proteins comprising at least one clotting factor, at least a portion of an immunoglobulin constant region, and optionally a linker.
  • the clotting factor can be linked covalently, or non-covalently with the portion of an immunoglobulin constant region.
  • the portion of an immunoglobulin constant region will have both an N, or an amino terminus, and a C, or carboxy terminus.
  • the chimeric protein of the invention may have a clotting factor linked to the N terminus of the portion of an immunoglobulin constant region.
  • the chimeric protein can optionally comprise at least one linker, thus the clotting factor does not have to be directly linked to the portion of an immunoglobulin constant region.
  • the linker can intervene in between the clotting factor and the portion of an immunoglobulin constant region.
  • the linker can be linked to the N terminus of the portion of an immunoglobulin constant region, or the C terminus of a portion of an immunoglobulin constant region.
  • the linker can be linked to the N terminus of the clotting factor.
  • the invention thus relates to a chimeric protein comprised of at least one clotting factor (X), optionally, a linker (L), and at least a portion of an immunoglobulin constant region (F).
  • a chimeric protein comprised of the formula X-L a -F wherein X is linked at its C terminus to the N terminus of L, and L is linked at its C terminus to the N terminus of F and wherein a is any integer or zero.
  • a is zero
  • X is directly linked at its C terminus to the N terminus of F.
  • a may be 0, 1, 2, 3, 4, 5, 10 or 20.
  • the invention relates to a chimeric protein comprising the amino acid sequence of FIG. 3A (SEQ ID NO:1).
  • the chimeric protein of the invention includes monomers, dimers, as well as higher order multimers.
  • the chimeric protein is a monomer comprising one clotting factor and one portion of an immunoglobulin constant region.
  • the chimeric protein is a dimer comprising two clotting factors and two portions of an immunoglobulin.
  • the two clotting factors are the same.
  • the two clotting factors are different.
  • the two portions of an immunoglobulin are the same.
  • the two portions of an immunoglobulin are different.
  • the chimeric protein is a monomer/dimer hybrid wherein the chimeric protein has a dimeric aspect in that it is comprised of at least a portion of two immunoglobulin constant region polypeptides and a monomeric aspect in that it is comprised of only one clotting factor linked to one of the two immunoglobulin.
  • the invention thus relates to a chimeric protein comprising a first chain and a second chain, wherein said first chain comprises at least a portion of an immunoglobulin constant region linked to a clotting factor and said second chain comprises at least a portion of an immunoglobulin constant region without a clotting factor linked to it.
  • Such chimeric proteins may be described using the formulas set forth in Table 1, where I, L, and F are as described above, and where (′) indicates a different molecule than without (′) and wherein (:) indicates a non-peptide bond TABLE 1 X-F:F-X X′-F:F-X X-L-F:F-X X-L-F:F-L-X X′-L-F:F-L-X X-L′-F:F-L-X X′-L′-F:F-L-X F:F-X F:F-L-X X-F:F X-L-F:F L-F:F-X X-F:F-L
  • Derivatives and analogs of the chimeric proteins of the invention, antibodies against the chimeric proteins of the invention and antibodies against binding partners of the chimeric proteins of the invention are all contemplated, and can be made by altering their amino acid sequences by substitutions, additions, and/or deletions/truncations or by introducing chemical modifications that result in functionally equivalent molecules. It will be understood by one of ordinary skill in the art that certain amino acids in a sequence of any protein may be substituted for other amino acids without adversely affecting the activity of the protein.
  • the derivative is functionally active, i.e., capable of exhibiting one or more activities associated with the chimeric proteins of the invention, e.g., clot formation, activation of a clotting factor.
  • Activity can be measured by assays known in the art, e.g., StaCLot FVIIa-rTF assay (Johannessen et al. 2000, Blood Coagulation and Fibrinolysis 11 :S1 59) prothrombin time (PT assay) or a APTT assay for factor IX
  • Substitutes for an amino acid within the sequence may be selected from other members of the class to which the amino acid belongs (see Table 2).
  • various amino acids are commonly substituted with neutral amino acids, e.g., alanine, leucine, isoleucine, valine, proline, phenylalanine, tryptophan, and methionine (see, e.g., MacLennan et al. (1998) Acta Physiol. Scand. Suppl. 643:55-67; Sasaki et al. (1998) Adv. Biophys. 35:1-24).
  • the chimeric proteins of this invention include at least one clotting factor.
  • the clotting factor can include any molecule that has clotting activity or activates a molecule with clotting activity.
  • the clotting factor can be comprised of a polypeptide, a small organic molecule, or a small inorganic molecule.
  • the clotting factor can be a mutated clotting factor or an analog of a clotting factor so long as it maintains at least some clotting activity.
  • the clotting factor can be, as an example, but not as a limitation factor VII, including B domain deleted factor VIII, factor IX (U.S. Pat.
  • the clotting factor is factor VII or factor VIIa.
  • the clotting factor is a mutated factor VII or VIIa (see, e.g., Persson, et al. 2001, Proc. Natl. Acad. Sci. USA 98:13583; U.S. patent application Ser. No.10/109498).
  • the clotting factor can be a factor that participates in the extrinsic pathway.
  • the clotting factor can be a factor that participates in the intrinsic pathway.
  • the clotting factor can be a factor that participates in both the extrinsic and intrinsic pathway.
  • the clotting factor can be a human clotting factor or a non-human clotting factor, e.g., derived from a non-human primate, a pig, or any mammal.
  • the clotting factor can be chimeric clotting factor, e.g., the clotting factor can comprise a portion of a human clotting factor and a portion of a porcine, or any non-human clotting factor or a portion of a first non-human clotting factor and a portion of a second non-human clotting factor.
  • the clotting factor can be an activated clotting factor.
  • the clotting factor can be an inactive form of a clotting factor, e.g., a zymogen.
  • the inactive clotting factor can undergo activation subsequent to being linked to at least a portion of an immunoglobulin constant region.
  • the inactive clotting factor can be activated subsequent to administration to a subject.
  • the inactive clotting factor can be activated prior to administration.
  • the chimeric proteins of this invention include at least a portion of an immunoglobulin constant region.
  • Immunoglobulins are comprised of four protein chains that associate covalently—two heavy chains and two light chains. Each chain is further comprised of one variable region and one constant region.
  • the heavy chain constant region is comprised of 3 or 4 constant region domains (e.g., CH1, CH2, CH3, CH4).
  • Some isotypes can also include a hinge region.
  • the portion of an immunoglobulin constant region can be a portion of an immunoglobulin constant region obtained from any mammal.
  • the portion of an immunoglobulin constant region can include, but is not limited to, a portion of a human immunoglobulin constant region, a non-human primate immunoglobulin constant region, a bovine immunoglobulin constant region, a porcine immunoglobulin constant region, a murine immunoglobulin constant region, an ovine immunoglobulin constant region or a rat immunoglobulin constant region.
  • the portion of an immunoglobulin constant region can include the entire heavy chain constant region, or a fragment or analog thereof.
  • a heavy chain constant region can comprise a CH1 domain, a CH2 domain, a CH3 domain, and/or a hinge region.
  • a heavy chain constant region can comprise a CH1 domain, a CH2 domain, a CH3 domain, and/or a CH4 domain.
  • the immunoglobulin can be produced recombinantly or synthetically.
  • the immunoglobulin can be isolated from a cDNA library.
  • the immunoglobulin can be isolated from a phage library (see McCafferty et al. 1990, Nature 348:552).
  • the immunoglobulin can be obtained by gene shuffling of known sequences (Mark et al. 1992, Bio/Technol. 10:779).
  • the immunoglobulin can be isolated by in vivo recombination (Waterhouse et al. 1993, Nucl. Acid Res. 21:2265).
  • the immunoglobulin can be a humanized immunoglobulin (Jones et al. 1986, Nature 332:323).
  • the portion of an immunoglobulin constant region can include a portion of an IgG, an IgA, an IgM, an IgD, an IgE.
  • the immunoglobulin is an IgG.
  • the immunoglobulin is IgG1.
  • the immunoglobulin is IgG2.
  • the portion of an immunoglobulin constant region can include an Fc fragment.
  • An Fc fragment can be comprised of the CH2 and CH3 domains of an immunoglobulin and the hinge region of the immunoglobulin.
  • the Fc fragment can be the Fc fragment of an IgG1, an IgG2, an IgG3 or an IgG4.
  • the immunoglobulin is an Fc fragment of an IgG1.
  • the immunoglobulin is an Fc fragment of an IgG2.
  • the portion of an immunoglobulin constant region is comprised of the amino acid sequence of SEQ ID NO:2 ( FIG. 3B ) or an analog thereof.
  • the immunoglobulin is comprised of a protein, or fragment thereof, encoded by the nucleic acid sequence of SEQ ID NO:3 ( FIG. 3C ).
  • the portion of an immunoglobulin constant region can include an Fc variant.
  • Fc variant refers to a molecule or sequence that is modified from a native Fc but still comprises a binding site for the salvage receptor, FcRn (WO 97/34631).
  • Native refers to an Fc that has not been modified by a human.
  • WO 96/32478 describes exemplary Fc variants, as well as interaction with the salvage receptor.
  • the term “Fc variant” comprises a molecule or sequence that is humanized from a non-human native Fc.
  • a native Fc comprises sites that may be removed because they provide structural features or biological activity that are not required for the fusion molecules of the present invention.
  • Fc variant comprises a molecule or sequence that lacks one or more native Fc sites or residues that affect or are involved in (1) disulfide bond formation, (2) incompatibility with a selected host cell (3) N-terminal heterogeneity upon expression in a selected host cell, (4) glycosylation, (5) interaction with complement, (6) binding to an Fc receptor other than a salvage receptor, or (7) antibody-dependent cellular cytotoxicity (ADCC).
  • ADCC antibody-dependent cellular cytotoxicity
  • an immunoglobulin constant region is an neonatal Fc receptor (FcRn) binding partner.
  • FcRn binding partner is any molecule that can be specifically bound by the FcRn receptor with consequent active transport by the FcRn receptor of the FcRn binding partner.
  • the FcRn receptor has been isolated from several mammalian species including humans. The sequences of the human FcRn, rat FcRn, and mouse FcRn are known (Story et al. 1994, J. Exp. Med. 180:2377).
  • the FcRn receptor binds IgG (but not other immunoglobulin classes such as IgA, IgM, IgD, and IgE) at relatively low pH, actively transports the IgG transcellularly in a luminal to serosal direction, and then releases the IgG at relatively higher pH found in the interstitial fluids. It is expressed in adult epithelial tissue (U.S. Pat. Nos. 6,030,613 and 6,086,875) including lung and intestinal epithelium (Israel et al. 1997, Immunology 92:69) renal proximal tubular epithelium (Kobayashi et al. 2002, Am. J. Physiol. Renal Physiol. 282:F358) as well as nasal epithelium, vaginal surfaces, and biliary tree surfaces.
  • IgG immunoglobulin classes such as IgA, IgM, IgD, and IgE
  • FcRn binding partners of the present invention encompass any molecule that can be specifically bound by the FcRn receptor including whole 1gG, the Fc fragment of 1gG, and other fragments that include the complete binding region of the FcRn receptor.
  • the region of the Fc portion of 1gG that binds to the FcRn receptor has been described based on X-ray crystallography (Burmeister et al. 1994, Nature 372:379).
  • the major contact area of the Fc with the FcRn is near the junction of the CH2 and CH3 domains. Fc-FcRn contacts are all within a single Ig heavy chain.
  • the FcRn binding partners include whole 1gG, the Fc fragment of 1gG, and other fragments of 1gG that include the complete binding region of FcRn.
  • the major contact sites include amino acid residues 248, 250-257, 272, 285, 288, 290-291, 308-311, and 314 of the CH2 domain and amino acid residues 385-387, 428, and 433-436 of the CH3 domain.
  • References made to amino acid numbering of immunoglobulins or immunoglobulin fragments, or regions, are all based on Kabat et al. 1991, Sequences of Proteins of Immunological Interest, U.S. Department of Public Health, Bethesda, Md.
  • the Fc region of IgG can be modified according to well recognized procedures such as site directed mutagenesis and the like to yield modified IgG or Fc fragments or portions thereof that will be bound by FcRn.
  • modifications include modifications remote from the FcRn contact sites as well as modifications within the contact sites that preserve or even enhance binding to the FcRn.
  • Fcy1 human IgG1 Fc
  • P238A S239A, K246A, K248A, D249A, M252A, T256A, E258A, T260A, D265A, S267A, H268A, E269A, D270A, E272A, L274A, N276A, Y278A, D280A, V282A, E283A, H285A, N286A, T289A, K290A, R292A, E293A, E294A, Q295A, Y296F, N297A, S298A, Y300F, R301A, V303A, V305A, T307A, L309A, Q311A, D312A, N315A, K317A, E318A, K320A, K32
  • one embodiment incorporates N297A, removing a highly conserved N-glycosylation site.
  • the effect of this mutation is to reduce immunogenicity, thereby enhancing circulating half life of the FcRn binding partner, and to render the FcRn binding partner incapable of binding to FcyRI, FcyRIIA, FcyRIIB, and FcyRIIIA, without compromising affinity for FcRn (Routledge et al. 1995, Transplantation 60:847; Friend et al. 1999, Transplantation 68:1632; Shields et al. 1995, J. Biol. Chem. 276:6591).
  • At least three human Fc gamma receptors appear to recognize a binding site on IgG within the lower hinge region, generally amino acids 234-237. Therefore, another example of new functionality and potential decreased immunogenicity may arise from mutations of this region, as for example by replacing amino acids 233-236 of human IgG1 “ELLG” to the corresponding sequence from IgG2 “PVA” (with one amino acid deletion). It has been shown that FcyRI, FcyRII, and FcyRIII which mediate various effector functions will not bind to IgG1 when such mutations have been introduced (Ward and Ghetie 1995, Therapeutic Immunology 2:77 and Armour et al.1999, Eur. J. Immunol. 29:2613).
  • affinity for FcRn may be increased beyond that of wild type in some instances. This increased affinity may reflect an increased “on” rate, a decreased “off” rate or both an increased “on” rate and a decreased “off” rate. Mutations believed to impart an increased affinity for FcRn include T256A, T307A, E380A, and N434A (Shields et al. 2001, J. Biol. Chem. 276:6591).
  • the FcRn binding partner is a polypeptide including the sequence PKNSSMISNTP and optionally further including a sequence selected from HQSLGTQ, HQNLSDGK, HQNISDGK, or VISSHLGQ (U.S. Pat. No. 5,739,277).
  • FcRn receptors can bind a single Fc molecule. Crystallographic data suggest that each FcRn molecule binds a single polypeptide of the Fc homodimer.
  • Linking the FcRn binding partner, e.g., an Fc fragment of an IgG, to a clotting factor thus provides a means of delivering the clotting factor orally or as an aerosol administered nasally, via an ocular route or via a pulmonary route.
  • portions of an immunoglobulin constant region for use in the chimeric protein of the invention can include mutants or analogs thereof, or can include chemically modified immunoglobulin constant regions or fragments thereof (e.g. pegylation) (see, e.g., Aslam and Dent 1998, Bioconjugation: Protein Coupling Techniques For the Biomedical Sciences Macmilan Reference , London).
  • a mutant can provide for enhanced binding of an FcRn binding partner for the FcRn.
  • peptide mimetics of at least a portion of an immunoglobulin constant region e.g., a peptide mimetic of an Fc fragment or a peptide mimetic of an FcRn binding partner.
  • the peptide mimetic is identified using phage display (See, e.g., McCafferty et al. 1990, Nature 348:552, Kang et al. 1991, Proc. Natl. Acad. Sci. USA 88:4363; EP 0 589 877 B1).
  • the chimeric protein of the invention can optionally comprise at least one linker molecule.
  • the linker is comprised of amino acids.
  • the linker can comprise 1-5 amino acids, 1-10 amino acids, 1-20 amino acids, 10-50 amino acids, 50-100 amino acids, 100-200 amino acids.
  • the linker can comprise the sequence G n .
  • the linker can comprise the sequence (GGS) n (SEQ ID NO.: 5). In each instance, n may be an integer, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10.
  • linkers include, but are not limited to, GGG (SEQ ID NO.: 6), SGGSGGS(SEQ ID NO.: 7), GGSGGSGGSGGSGGG, (SEQ ID NO.: 8) and GGSGGSGGSGGSGGSGGS,. (SEQ ID NO.: 9)
  • the linker does not eliminate the clotting activity of the clotting factor.
  • the linker enhances the clotting activity of the clotting factor, e.g., by diminishing the effects of steric hindrance and making the clotting factor more accessible to its target binding site, e.g., another factor in the clotting cascade.
  • the invention relates to a nucleic acid construct comprising a nucleic acid sequence encoding the chimeric proteins of the invention, said nucleic acid sequence comprising a first nucleic acid sequence encoding, for example at least one clotting factor, operatively linked to a second nucleic acid sequence encoding at least a portion of an immunoglobulin constant region.
  • the nucleic acid sequence can also include additional sequences or elements known in the art (e.g. promoters, enhancers, poly A sequences, signal sequence).
  • the nucleic acid sequence can optionally include a sequence encoding a linker placed between the nucleic acid sequence encoding at least one clotting factor and the portion of an immunoglobulin.
  • the nucleic acid sequence can optionally include a linker sequence placed before or after the nucleic acid sequence encoding at least one clotting factor and the portion of an immunoglobulin.
  • the nucleic acid construct is comprised of DNA. In another embodiment, the nucleic acid construct is comprised of RNA.
  • the nucleic acid construct can be a vector, e.g., a viral vector or a plasmid.
  • viral vectors include, but are not limited to adeno virus vector, an adeno associated virus vector or a murine leukemia virus vector.
  • plasmids include but are not limited to, e.g., pUC and pGEX.
  • the nucleic acid construct comprises the nucleic acid sequence of FIG. 3D (SEQ ID NO:4).
  • a DNA sequence can vary from that shown in SEQ ID NOS:3 or 4 and still encode a polypeptide having the amino acid sequence of SEQ ID NOS:2 or 1 respectively.
  • Such variant DNA sequences can result from silent mutations (e.g. occurring during PCR amplification), or can be the product of deliberate mutagenesis of a native sequence.
  • the invention thus provides isolated DNA sequences encoding polypeptides of the invention, selected from: (a) DNA comprising the nucleotide sequence of SEQ ID NO:3 or 4; (b) DNA encoding the polypeptide of SEQ ID NO:1 or 2; (c) DNA capable of hybridization to a DNA of (a) or (b) under conditions of moderate stringency and which encodes polypeptides of the invention; (d) DNA capable of hybridization to a DNA of (a) or (b) under conditions of high stringency and which encodes polypeptides of the invention, and (e) DNA which is degenerate as a result of the genetic code to a DNA defined in (a), (b), (c), or (d) and which encode polypeptides of the invention.
  • polypeptides encoded by such DNA sequences are encompassed by the invention.
  • nucleic acid molecules of the invention also comprise nucleotide sequences that are at least 80% identical to a native sequence. Also contemplated are embodiments in which a nucleic acid molecule comprises a sequence that is at least 90% identical, at least 95% identical, at least 98% identical, at least 99% identical, or at least 99.9% identical to a native sequence.
  • the percent identity may be determined by visual inspection and mathematical calculation. Alternatively, the percent identity of two nucleic acid sequences can be determined by comparing sequence information using the GAP computer program, version 6.0 described by Devereux et al. 1984, Nucl. Acids Res. 12:387, and available from the University of Wisconsin Genetics Computer Group (UWGCG).
  • the preferred default parameters for the GAP program include: (1) a unary comparison matrix (containing a value of 1 for identities and 0 for non identities) for nucleotides, and the weighted comparison matrix of Gribskov and Burgess 1986, Nucl. Acids Res. 14:6745, as described by Schwartz and Dayhoff, eds., 1979, Atlas of Protein Sequence and Structure, National Biomedical Research Foundation, pp. 353-358; (2) a penalty of 3.0 for each gap and an additional 0.10 penalty for each symbol in each gap; and (3) no penalty for end gaps.
  • Other programs used by one skilled in the art of sequence comparison may also be used.
  • Chimeric proteins comprising at least a portion of an immunoglobulin constant region and a clotting factor can be synthesized using techniques well known in the art.
  • the chimeric proteins of the invention can be synthesized recombinantly in cells (see, e.g., Sambrook et al. 1989, Molecular Cloning A Laboratory Manual , Cold Spring Harbor Laboratory, N.Y. and Ausubel et al. 1989, Current Protocols in Molecular Biology , Greene Publishing Associates and Wiley Interscience, N.Y.).
  • DNA sequences encoding immunoglobulins, or fragments thereof, or clotting factors, or fragments thereof, may be cloned from a variety of genomic or cDNA libraries known in the art.
  • the techniques for isolating such DNA sequences using probe-based methods are conventional techniques and are well known to those skilled in the art. Probes for isolating such DNA sequences may be based on published DNA sequences (see, for example, Hieter et al. 1980, Cell 22: 197-207).
  • the polymerase chain reaction (PCR) method disclosed by Mullis et al. (U.S. Pat. No.4,683,195) and Mullis (U.S. Pat. No. 4,683,202) may be used.
  • DNA sequences encoding immunoglobulins, or fragments thereof, or clotting factors can be obtained from vectors known in the art to contain immunoglobulins, or fragments thereof, or clotting factors.
  • a polynucleotide sequence encoding the chimeric protein is inserted into an appropriate expression vehicle, i.e., a vector which contains the necessary elements for the transcription and translation of the inserted coding sequence, or in the case of an RNA viral vector, the necessary elements for replication and translation.
  • an appropriate expression vehicle i.e., a vector which contains the necessary elements for the transcription and translation of the inserted coding sequence, or in the case of an RNA viral vector, the necessary elements for replication and translation.
  • the nucleic acid encoding the chimeric protein is inserted into the vector in proper reading frame.
  • the nucleic acid can also encode for a propeptide clotting factor which is modified by the cell to yield the mature chimeric protein of the invention.
  • the propeptide clotting factor is recognized by a vitamin K-dependent ⁇ carboxylase which modifies the propeptide clotting factor to achieve full activity (e.g. factor VII, factor IX, factor X, prothrombin).
  • an endoprotease e.g., paired basic amino acid cleaving enzyme (PACE), or any PACE family member, such as PCSK1-9, including truncated versions thereof, or its yeast equivalent Kex2 from S.
  • PACE paired basic amino acid cleaving enzyme
  • Kex2 cerevisiae and truncated versions of Kex2 (see, e.g., U.S. Pat. Nos. 5,077,204; 5,162,220; 5,234,830; 5,885,821; 6,329,176 (Kex2 1-675)).
  • the expression vehicle is then transfected into a suitable target cell which will express the protein, e.g., a chimeric protein.
  • Transfection techniques known in the art include, but are not limited to, calcium phosphate precipitation (Wigler et al. 1978, Cell 14:725) and electroporation (Neumann et al. 1982, EMBO, J. 1:841).
  • a variety of host-expression vector systems may be utilized to express the chimeric proteins described herein in eukaryotic cells.
  • the eukaryotic cell is an animal cell, including mammalian cells (e.g. CHO, BHK, Cos, HeLa cells).
  • the DNA encoding the chimeric protein may also code for a signal sequence that will permit the chimeric protein to be secreted.
  • a signal sequence that will permit the chimeric protein to be secreted.
  • the signal sequence is cleaved by the cell to form the mature chimeric protein.
  • Various signal sequences are known in the art e.g., native factor VII signal sequence, native factor IX signal sequence and the mouse IgK light chain signal sequence.
  • the chimeric protein can be recovered by lysing the cells.
  • transgenic animals refers to non-human animals that have incorporated a foreign gene into their genome. Because this gene is present in germline tissues, it is passed from parent to offspring. Exogenous genes are introduced into single-celled embryos (Brinster et al. 1985, Proc. Natl. Acad. Sci. USA 82:4438). Methods of producing transgenic animals are known in the art, including transgenics that produce immunoglobulin molecules (Wagner et al. 1981, Proc. Natl. Acad. Sci. USA 78:6376; McKnight et al.
  • the expression vectors can encode for tags that permit for easy purification or identification of the recombinantly produced protein.
  • tags include, but are not limited to, vector pUR278 (Ruther et al. 1983, EMBO J. 2:1791) in which the chimeric protein described herein coding sequence may be ligated into the vector in frame with the lac z coding region so that a hybrid protein is produced;
  • pGEX vectors may be used to express proteins with a glutathione S-transferase (GST) tag. These proteins are usually soluble and can easily be purified from cells by adsorption to glutathione-agarose beads followed by elution in the presence of free glutathione.
  • the vectors include cleavage sites (e.g. PreCission ProteaseTM (Pharmacia, Peapack, N.J.)) for easy removal of the tag after purification.
  • the polynucleotide can be designed to encode multiple units of the chimeric protein of the invention separated by enzymatic cleavage sites.
  • the resulting polypeptide can be cleaved (e.g. by treatment with the appropriate enzyme) in order to recover the polypeptide units.
  • This can increase the yield of polypeptides driven by a single promoter.
  • the translation of each polypeptide encoded by the mRNA is directed internally in the transcript; e.g., by an internal ribosome entry site, IRES.
  • the polycistronic construct directs the transcription of a single, large polycistronic mRNA which, in turn, directs the translation of multiple, individual polypeptides. This approach eliminates the production and enzymatic processing of polyproteins and may significantly increase yield of a polypeptide driven by a single promoter.
  • Vectors used in transformation will usually contain a selectable marker used to identify transformants. In bacterial systems this can include an antibiotic resistance gene such as ampicillin, blasticidin or kanamycin. Selectable markers for use in cultured mammalian cells include genes that confer resistance to drugs, such as neomycin, hygromycin, and methotrexate.
  • the selectable marker may be an amplifiable selectable marker.
  • One amplifiable selectable marker is the dihydrofolate reductase gene (DHFR gene).
  • Another amplifiable marker is the DHFRr cDNA (Simonsen and Levinson 1983, Proc. Natl. Acad. Sci. (USA) 80:2495). Selectable markers are reviewed by Thilly ( Mammalian Cell Technology , Butterworth Publishers, Stoneham, Mass.) and the choice of selectable markers is well within the level of ordinary skill in the art.
  • Selectable markers may be introduced into the cell on a separate plasmid at the same time as the gene of interest, or they may be introduced on the same plasmid. If on the same plasmid, the selectable marker and the gene of interest may be under the control of different promoters or the same promoter, the latter arrangement producing a dicistronic message. Constructs of this type are known in the art (for example, U.S. Pat. No.4,713,339).
  • the expression elements of the expression systems vary in their strength and specificities.
  • any of a number of suitable transcription and translation elements including constitutive and inducible promoters, may be used in the expression vector.
  • inducible promoters such as pL of bacteriophage ⁇ , plac, ptrp, ptac (ptrp-lac hybrid promoter) and the like may be used;
  • promoters such as the baculovirus polyhedron promoter may be used;
  • promoters derived from the genome of plant cells e.g.
  • heat shock promoters the promoter for the small subunit of RUBISCO; the promoter for the chlorophyll a/b binding protein) or from plant viruses (e.g. the 35S RNA promoter of CaMV; the coat protein promoter of TMV) may be used; when cloning in mammalian cell systems, promoters derived from the genome of mammalian cells (e.g. metallothionein promoter) or from mammalian viruses (e.g.
  • the adenovirus late promoter may be used; when generating cell lines that contain multiple copies of expression product, SV40-, BPV- and EBV-based vectors may be used with an appropriate selectable marker.
  • the expression of sequences encoding linear or non-cyclized forms of the chimeric proteins of the invention may be driven by any of a number of promoters.
  • viral promoters such as the 35S RNA and 19S RNA promoters of CaMV (Brisson et al. 1984, Nature 310:511-514), or the coat protein promoter of TMV (Takamatsu et al. 1987, EMBO J. 3:1671-1680; Broglie et al.
  • Autographa californica nuclear polyhidrosis virus (AcNPV) is used as a vector to express the foreign genes.
  • the virus grows in Spodoptera frugiperda cells.
  • a coding sequence may be cloned into non-essential regions (for example the polyhedron gene) of the virus and placed under control of an AcNPV promoter (for example, the polyhedron promoter). Successful insertion of a coding sequence will result in inactivation of the polyhedron gene and production of non-occluded recombinant virus (i.e. virus lacking the proteinaceous coat coded for by the polyhedron gene).
  • a number of viral based expression systems may be utilized.
  • a coding sequence may be ligated to an adenovirus transcription/translation control complex, e.g., the late promoter and tripartite leader sequence.
  • This chimeric gene may then be inserted in the adenovirus genome by in vitro or in vivo recombination. Insertion in a non-essential region of the viral genome (e.g. region E1 or E3) will result in a recombinant virus that is viable and capable of expressing a polypeptide peptide in infected hosts (see, e.g., Logan & Shenk 1984, Proc.
  • the vaccinia 7.5 K promoter may be used (see, e.g., Mackett et al. 1982, Proc. Natl. Acad. Sci. (USA) 79:7415; Mackett et al. 1984, J. Virol. 49:857; Panicali et al. 1982, Proc. Natl. Acad. Sci. (USA) 79:4927).
  • a coding sequence may be ligated to an adenovirus transcription/translation control complex, e.g., the late promoter and tripartite leader sequence.
  • This chimeric gene may then be inserted in the adenovirus genome by in vitro or in vivo recombination. Insertion in a non-essential region of the viral genome (e.g. region E1 or E3) will result in a recombinant virus that is viable and capable of expressing a polypeptide in infected hosts (see, e.g., Logan & Shenk 1984, Proc. Natl. Acad. Sci. (USA) 81:3655-3659).
  • the vaccinia 7.5 K promoter may be used (see, e.g., Mackett et al. 1982, Proc. Natl. Acad. Sci. (USA) 79:7415-7419; Mackett et al. 1984, J. Virol. 49:857-864; Panicali et al. 1982, Proc. Natl. Acad. Sci. (USA) 79:4927).
  • the term “appropriate growth medium” means a medium containing nutrients required for the growth of cells. Nutrients required for cell growth may include a carbon source, a nitrogen source, essential amino acids, vitamins, minerals and growth factors.
  • the media contains vitamin K which is necessary for a cellular ⁇ carboxylase to confer activity upon a recombinantly produced clotting factor, e.g., factor VII.
  • the media can contain bovine calf serum or fetal calf serum.
  • the growth medium will generally select for cells containing the DNA construct by, for example, drug selection or deficiency in an essential nutrient, which is complemented by the selectable marker on the DNA construct or co-transfected with the DNA construct.
  • Cultured mammalian cells are generally grown in commercially available serum-containing or serum-free media (e.g. MEM, DMEM). Selection of a medium appropriate for the particular cell line used is within the level of ordinary skill in the art.
  • the recombinantly produced chimeric protein of the invention can be isolated from the culture media using procedures well-established in the art (e.g., affinity chromatography, size exclusion chromatography, ion exchange chromatography).
  • the chimeric protein of the invention can be isolated from the culture media by column chromatography, e.g., a protein A column, or by ion exchange chromatography.
  • column chromatography e.g., a protein A column, or by ion exchange chromatography.
  • the chromatographic separation can contribute to the activation of the chimeric protein of the invention, e.g., by converting factor VII to factor VIIa.
  • the culture medium from appropriately grown transformed or transfected host cells is separated from the cell material, and the presence of chimeric proteins is demonstrated.
  • One method of detecting the chimeric proteins is by the binding of the chimeric proteins or portions of the chimeric proteins to a specific antibody recognizing the chimeric protein of the invention (e.g., an anti-Fc antibody).
  • An anti-chimeric protein antibody may be a monoclonal or polyclonal antibody raised against the chimeric protein in question.
  • the chimeric protein can contain a portion of an immunoglobulin constant region.
  • Antibodies recognizing the constant region of many immunoglobulins are known in the art and are commercially available.
  • An antibody can be used to perform an ELISA or a western blot to detect the presence of the chimeric protein of the invention.
  • chimeric proteins of the invention have many uses as will be recognized by one skilled in the art, including, but not limited to methods of treating a subject having a hemostatic disorder and methods of treating a subject in need of a general hemostatic agent.
  • the invention relates to a method of treating a subject having a hemostatic disorder comprising administering a therapeutically effective amount of at least one chimeric protein, wherein the chimeric protein comprises at least a portion of an immunoglobulin constant region and at least one clotting factor.
  • the chimeric protein of the invention treats or prevents a hemostatic disorder by promoting the formation of a fibrin clot.
  • the chimeric protein of the invention can activate any member of a coagulation cascade.
  • the clotting factor can be a participant in the extrinsic pathway, the intrinsic pathway or both.
  • the clotting factor is factor VII or factor VIIa.
  • Factor VIIa can activate factor X which interacts with factor Va to cleave prothrombin to thrombin, which in turn cleaves fibrinogen to fibrin.
  • the chimeric protein of the invention can be used to treat any hemostatic disorder.
  • hemostatic disorders that may be treated by administration of the chimeric protein of the invention include, but are not limited to, hemophilia A, hemophilia B, von Willebrand's disease, factor XI deficiency (PTA deficiency), factor XII deficiency, as well as deficiencies or structural abnormalities in fibrinogen, prothrombin, factor V, factor VII, factor X, or factor XIII.
  • the hemostatic disorder is an inherited disorder.
  • the subject has hemophilia A, and the chimeric protein comprises factor VIII or factor VIIIa.
  • the subject has hemophilia A and the chimeric protein comprises factor VII or factor VIIa.
  • the subject has hemophilia B and the chimeric protein comprises factor IX or factor IXa.
  • the subject has hemophilia B and the chimeric protein comprises factor VII or factor VIIa.
  • the subject has inhibitory antibodies to factor VIII or factor VIIIa and the chimeric protein comprises factor VII or factor VIIa.
  • the subject has inhibitory antibodies against factor IX or factor IXa and the chimeric protein comprises factor VII or factor VIIa.
  • the chimeric protein of the invention can be used to prophylactically treat a subject with a hemostatic disorder.
  • the chimeric protein of the invention can be used to treat an acute bleeding episode in a subject with a hemostatic disorder.
  • the hemostatic disorder is the result of a deficiency in a clotting factor, e.g., factor IX, factor VII, factor VII.
  • a clotting factor e.g., factor IX, factor VII, factor VII.
  • the hemostatic disorder can be the result of a defective clotting factor, e.g., von Willebrand's factor.
  • the hemostatic disorder can be an acquired disorder.
  • the acquired disorder can result from an underlying secondary disease or condition.
  • the unrelated condition can be, as an example, but not as a limitation, cancer, an auto-immmune disease, or pregnancy.
  • the acquired disorder can result from old age or from medication to treat an underlying secondary disorder (e.g. cancer chemotherapy).
  • the invention also relates to methods of treating a subject that does not have a hemostatic disorder or a secondary disease or condition resulting in acquisition of a hemostatic disorder.
  • the invention thus relates to a method of treating a subject in need of a general hemostatic agent comprising administering a therapeutically effective amount of at least one chimeric protein, wherein the chimeric protein comprises at least a portion of an immunoglobulin constant region and at least one clotting factor.
  • the subject in need of a general hemostatic agent is undergoing, or is about to undergo, surgery.
  • the chimeric protein of the invention can be administered prior to, during, or after surgery as a prophylactic.
  • the chimeric protein of the invention can be administered prior to, during, or after surgery to control an acute bleeding episode.
  • the surgery can include, but is not limited to liver transplantation, liver resection, or stem cell transplantation.
  • the chimeric protein of the invention can be used to treat a subject having an acute bleeding episode who does not have a hemostatic disorder.
  • the acute bleeding episode can result from severe trauma, e.g., surgery, an automobile accident, wound, laceration gun shot, or any other traumatic event resulting in uncontrolled bleeding.
  • the chimeric protein of the invention can be administered intravenously, subcutaneously, intramuscularly, or via any mucosal surface, e.g., orally, sublingually, buccally, nasally, rectally, vaginally or via pulmonary route.
  • the chimeric protein can be implanted within or linked to a biopolymer solid support that allows for the slow release of the chimeric protein to the site of bleeding or implanted into bandage/dressing.
  • the dose of the chimeric protein of the invention will vary depending on the subject and upon the particular route of administration used. Dosages can range from 0.1 to 100,000 ⁇ g/kg body weight. In one embodiment, the dosing range is 0.1-1,000 ⁇ g/kg.
  • the protein can be administered continuously or at specific timed intervals. In vitro assays may be employed to determine optimal dose ranges and/or schedules for administration. In vitro assays that measure clotting factor activity are known in the art, e.g., STA-CLOT VIIa-rTF clotting assay. Additionally, effective doses may be extrapolated from dose-response curves obtained from animal models, e.g., a hemophiliac dog (Mount et al. 2002, Blood 99(8):2670).
  • the invention also relates to a pharmaceutical composition
  • a pharmaceutical composition comprising a clotting factor, at least a portion of an immunoglobulin constant region and a pharmaceutically acceptable carrier or excipients.
  • suitable pharmaceutical carriers are described in Remington's Pharmaceutical Sciences by E. W. Martin.
  • excipients can include starch, glucose, lactose, sucrose, gelatin, malt, rice, flour, chalk, silica gel, sodium stearate, glycerol monostearate, talc, sodium chloride, dried skim milk, glycerol, propylene, glycol, water, ethanol, and the like.
  • the composition can also contain pH buffering reagents, and wetting or emulsifying agents.
  • the pharmaceutical composition can take the form of tablets or capsules prepared by conventional means.
  • the composition can also be prepared as a liquid for example a syrup or a suspension.
  • the liquid can include suspending agents (e.g. sorbitol syrup, cellulose derivatives or hydrogenated edible fats), emulsifying agents (lecithin or acacia), non-aqueous vehicles (e.g. almond oil, oily esters, ethyl alcohol, or fractionated vegetable oils), and preservatives (e.g. methyl or propyl-p-hydroxybenzoates or sorbic acid).
  • the preparations can also include flavoring, coloring and sweetening agents.
  • the composition can be presented as a dry product for constitution with water or another suitable vehicle.
  • the composition may take the form of tablets or lozenges according to conventional protocols.
  • the compounds for use according to the present invention are conveniently delivered in the form of a nebulized aerosol with or without excipients or in the form of an aerosol spray from a pressurized pack or nebulizer, with optionally a propellant, e.g., dichlorodifluoromethane, trichlorofluoromethane, dichlorotetrafluoromethane, carbon dioxide or other suitable gas.
  • a pressurized aerosol the dosage unit can be determined by providing a valve to deliver a metered amount.
  • Capsules and cartridges of, e.g., gelatin for use in an inhaler or insufflator can be formulated containing a powder mix of the compound and a suitable powder base such as lactose or starch.
  • the pharmaceutical composition can be formulated for parenteral administration (i.e. intravenous or intramuscular) by bolus injection.
  • parenteral administration i.e. intravenous or intramuscular
  • Formulations for injection can be presented in unit dosage form, e.g., in ampoules or in multidose containers with an added preservative.
  • the compositions can take such forms as suspensions, solutions, or emulsions in oily or aqueous vehicles, and contain formulatory agents such as suspending, stabilizing and/or dispersing agents.
  • the active ingredient can be in powder form for constitution with a suitable vehicle, e.g., pyrogen free water.
  • the pharmaceutical composition can also be formulated for rectal administration as a suppository or retention enema, e.g., containing conventional suppository bases such as cocoa butter or other glycerides.
  • the invention in another embodiment, relates to a method of treating a subject with a hemostatic disorder comprising administering a therapeutically effective amount of at least one chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region in combination with at least one other clotting factor or-agent that promotes hemostasis.
  • Said other clotting factor or agent that promotes hemostasis can be any therapeutic with demonstrated clotting activity.
  • the clotting factor or hemostatic agent can include factor V, factor VII, factor VIII, factor IX, factor X, factor XI, factor XII, factor XIII, prothrombin, fibrinogen, von Willebrand factor or recombinant soluble tissue factor (rsTF) or activated forms of any of the preceding.
  • the clotting factor of hemostatic agent can also include anti-fibrinolytic drugs, e.g., epsilon-amino-caproic acid, tranexamic acid.
  • the invention provides a kit for the diagnosis of a hemostatic disorder.
  • the kit can include a container and a chimeric protein comprising at least one clotting factor and at least a portion of an immunoglobulin constant region.
  • the chimeric protein can be provided in an appropriate buffer or solvent.
  • the buffer can be an aqueous buffer, e.g., PBS or alternatively the chimeric protein can be lyophilized.
  • the kit can also provide instructions for detecting the presence of a clotting factor in a sample, e.g., contacting an aliquot of a sample with the chimeric protein of the invention and detecting the presence of a clot. Detection can include visible detection.
  • the kit can optionally provide an aliquot of blood lacking a known clotting factor.
  • the sequence for the FLAG peptide (Asp-Tyr-Lys-Asp-Asp-Asp-Asp-Lys)(SEQ ID NO: 23), a common affinity tag used to identify or purify proteins, was cloned into the pcDNA 3.1-Fc plasmid, which contains the mouse IgK signal sequence followed by the Fc fragment of human IgG1 (amino acids 221-447, EU numbering).
  • FlagFc-F1 5′- GCTGGCTAGCCACCATGGA -3′ (SEQ ID NO: 10)
  • FlagFc-R1 5′- CTTGTCATCGTCGTCCTTGTAGTCGTCA (SEQ ID NO: 11) CCAGTGGAACCTGGAAC -3′
  • FlagFc-F2 5′- GACTACAAGG ACGACGATGA (SEQ ID NO: 12) CAAGGACAAA ACTCACACAT GCCCACCGTG CCCAGCTCCG GAACTCC -3′
  • FlagFc-R2 5′- TAGTGGATCCTCATTTACCCG -3′ (SEQ ID NO: 13)
  • the pcDNA 3.1-Fc template was then added to two separate PCR reactions containing 50 pmol each of the primer pairs FlagFc-F1/R1 or FlagFc-F2/R2 in a 50 ⁇ l reaction using Pfu Ultra DNA polymerase (Stratagene, Calif.) according to manufacturer's standard protocol in a MJ Thermocycler using the following cycles: 95° C. 2 minutes; 30 cycles of (95° C. 30 seconds, 52° C. 30 seconds, 72° C. 45 seconds), followed by 72° C. for 10 minutes.
  • the products of these two reactions were then mixed in another PCR reaction (2 ⁇ l each) with 50 pmol of FlagFc-F1 and FlagFc-R2 primers in a 50 ⁇ l reaction using Pfu Ultra DNA polymerase (Stratagene, Calif.) according to manufacturer's standard protocol in a MJ Thermocycler using the following cycles: 95° C. 2 minutes; 30 cycles of (95° C. 30 seconds, 52° C. 30 seconds, 72° C. 45 seconds), followed by 72° C. for 10 minutes.
  • the resulting fragment was gel purified, digested and inserted into the pcDNA 3.1-Fc plasmid NheI-BamHI.
  • the resulting plasmid contains the mouse IgK signal sequence producing the FlagFc protein.
  • the coding sequence for human PACE (paired basic amino acid cleaving enzyme), an endoprotease, was obtained by RT-PCR.
  • the following primers were used: (SEQ ID NO: 15) PACE-F1: 5′- GGTAAGCTTGCCATGGAGCTGAGGCCCTGGTTGC - 3′ (SEQ ID NO: 16) PACE-R1: 5′- GTTTTCAATCTCTAGGACCCACTCGCC -3′ (SEQ ID NO: 17) PACE-F2: 5′- GCCAGGCCACATGACTACTCCGC -3′ (SEQ ID NO: 18) PACE-R2: 5′- GGTGAATTCTCACTCAGGCAGGTGTGAGGGCAGC - 3′
  • the PACE-F1 primer adds a HindIII site to the 5′ end of the PACE sequence beginning with 3 nucleotides before the start codon, while the PACE-R2 primer adds a stop codon after amino acid 715, which occurs at the end of the extracellular domain of PACE, as well as adding an EcoRI site to the 3′ end of the stop codon.
  • the PACE-R1 and -F2 primers anneal on the 3′ and 5′ sides of an internal BamHI site, respectively.
  • RT-PCR reactions Two RT-PCR reactions were then set up using 25 pmol each of the primer pairs of PACE-F1/R1 or PACE-F2/R2 with 20 ng of adult human liver RNA (Clontech; Palo Alto, Calif.) in a 50 ⁇ l RT-PCR reaction using the SuperScript.TM One-Step RT-PCR with PLATINUM® Taq system (Invitrogen, Carlsbad, Calif.) according to manufacturers protocol.
  • the reaction was carried out in a MJ Thermocycler using the following cycles: 50° C. 30 minutes; 94° C. 2 minutes; 30 cycles of (94° C. 30 seconds, 58° C. 30 seconds, 72° C. 2 minutes), followed by 72° C. 10 minutes.
  • the coding sequence for Factor VII was obtained by RT-PCR from human fetal liver RNA (Clontech, Palo Alto, Calif.).
  • the cloned region is comprised of the cDNA sequence from bp 36 to bp 1430 terminating just before the stop codon.
  • a SbfI site was introduced on the N-terminus.
  • a BspEI site was introduced on the C-terminus.
  • the construct was cloned by PCR using the primers: (SEQ ID NO: 19) Down- 5′ GCTACCTGCAGGCCACCATGGTCTCCCAGGCCCTCAGG stream: 3′ (SEQ ID NO: 20) Upstream: 5′ CAGTTCCGGAGCTGGGCACGGCGGGCACGTGTGAGTTT TGTCGGGAAAT GG 3′ and the following conditions: 95° C. for 5 minutes followed by 30 cycles of 95° C. for 30 seconds, 55° C. for 30 seconds, 72° C. for 1 minute and 45 seconds, and a final extension cycle of 72° C. for 10 minutes.
  • the fragment was digested SbfI-BspE I and inserted into pED.dC-Fc a plasmid encoding for the Fc fragment of an IgG1.
  • CHO DG-44 cells expressing Factor VII-Fc were established. CHO DG-44 cells were grown at 37° C., 5% CO2, in MEM Alpha plus nucleoside and ribonucleosides and supplemented with 5% heat-inactivated fetal bovine serum until transfection.
  • DG44 cells were plated in 100 mm tissue culture petri dishes and grown to a confluency of 50%-60%. A total of 10 ⁇ g of DNA was used to transfect one 100 mm dish: either 9 ⁇ g pED.dC.FVII-Fc+1 ⁇ g of pcDNA6-PACE for the dimer transfection, or 7.5 ⁇ g of pED.dC.FVII-Fc+1.5 ⁇ g pcDNA3/Flag-Fc+1 ⁇ g of pcDNA6-PACE for the monomer transfection. The cells were transfected as described in the Superfect transfection reagent manual (Qiagen, Valencia, Calif.).
  • the media was removed after 48 hours and replaced with MEM Alpha without nucleosides plus 5% dialyzed fetal bovine serum and 10 ⁇ g/ml of Blasticidin (Invitrogen, Carlsbad, Calif.) for both transfections, while the monomer-dimer hybrid transfection was also supplemented with 0.2 mg/ml geneticin (Invitrogen, Carlsbad, Calif.).
  • the cells were released from the plate with 0.25% trypsin and transferred into T25 tissue culture flasks, and the selection was continued for 10-14 days until the cells began to grow well as stable cell lines were established. Protein expression was subsequently amplified by the addition 25 nM methotrexate.
  • Approximately 2 ⁇ 10 7 cells were used to inoculate 300 ml of growth medium in a 1700 cm 2 roller bottle (Corning, Corning, N.Y.) supplemented with 5 ⁇ g/L of vitamin K 3 (menadione sodium bisulfite) (Sigma, St Louis, Mo.).
  • the roller bottles were incubated in a 5% CO 2 at 37° C. for 72 hours.
  • the growth medium was then exchanged with 300 ml serum-free production medium (DMEM/F12 with 5 ⁇ g/ml bovine insulin and 10 ⁇ g/ml Gentamicin) supplemented with 5 ⁇ g/L of vitamin K 3 .
  • the production medium (conditioned medium) was collected every day for 10 days and stored at 4° C.
  • Fresh production medium was added to the roller bottles after each collection and the bottles were returned to the incubator. Pooled media was first clarified using a Sartoclean glass fiber filter (3.0 ⁇ m+0.2 ⁇ m) (Sartorious Corp. Gottingen, Germany) followed by an Acropack 500 filter (0.8 ⁇ m+0.2 ⁇ m) (Pall Corp., East Hills, N.Y.). The clarified media was then concentrated approximately 20-fold using Pellicon Biomax tangential flow filtration cassettes (10 kDa MWCO) (Millipore Corp., Billerica, Mass.).
  • Fc chimeras were then captured from the concentrated media by passage over a Protein A Sepharose 4 Fast Flow Column (AP Biotech, Piscataway, N.J.).
  • a 5 ⁇ 5 cm (100 ml) column was loaded with ⁇ 5 mg Fc protein per ml column volume at a linear flow rate of 100 cm/hour to achieve a residence time of ⁇ 3 minutes.
  • the column was then washed with >5 column volumes of 1 ⁇ DPBS to remove non-specifically bound proteins.
  • the bound proteins were eluted with 100 mM Glycine pH 3.0. Elution fractions containing the protein peak were then neutralized by adding 1 part 1 M Tris-HCL, pH 8 to 10 parts elute fraction.
  • the monomer-dimer hybrid transfection protein sample was subject to further purification, as it contained a mixture of FVII-Fc:FVII-Fc homodimer, FVII-FC: FLAG-FC monomer-dimer hybrid, and FLAG-Fc: FLAG-Fc homodimers.
  • FVII-Fc FLAG-FC monomer-dimer hybrid
  • FLAG-Fc FLAG-Fc homodimers.
  • the Protein A Sepharose 4 Fast Flow pool was first dialyzed into 20 mM MES, 20 mM NaCl, pH 6.1 and was then passed over a Unosphere S cation-exchange column (BioRad Corp., Richmond, Calif.).
  • the dialyzed material was then loaded onto a 1.1 ⁇ 11 cm (9.9 ml) column at 150 cm/hour. During the wash and elution, the flow rate was increased to 500 cm/hour.
  • the column was washed sequentially with 8 column volumes of 20 mM MES, 20 mM NaCl, pH 6.1 and 8 column volumes of 20 mM MES, 40 mM NaCl, pH 6.1.
  • the bound protein was eluted with 20 mM MES, 750 mM NaCl, pH 6.1. Elution fractions containing the protein peak were pooled and sterile filtered through a 0.2 ⁇ m filter disc prior to storage at ⁇ 80° C.
  • An anti-FLAG MAB affinity column was used to separate chimeric Fc dimers with hFVII fused to both Fc molecules from those with one FLAG peptide and one hFVII fusion.
  • the Unosphere S Eluate pool was diluted 1:1 with 20 mM Tris, 50 mM NaCl, 5 mM CaCl 2 , pH 8 and loaded onto a 1.6 ⁇ 5 cm M2 anti-FLAG sepharose column (Sigma Corp., St. Louis, Mo.) at a linear flow rate of 60 cm/hour. Loading was targeted to ⁇ 2.5 mg monomer-dimer hybrid/ml column volume.
  • the StaClot FVIIa-rTF assay kit was purchased from Diagnostica Stago (Parsippany, N.J.) and modified as described in Johannessen et al. 2000, Blood Coagulation and Fibrinolysis 11: S159. A standard curve was performed with the FVIIa World Health Organization standard 89/688.
  • the assay compared a homodimer comprised of two factor VII molecules and two Fc molecules with a monomer/dimer hybrid comprised of one factor VII molecule and two Fc molecules. Significant clotting activity was observed for both the monomer/dimer hybrid and the homodimer. The clotting activity of the monomer/dimer hybrid compared to the homodimer was almost four times as great ( FIG. 4 ).
  • 25 gram day 9 newborn rats were purchased from Charles River (Wilmington, Mass.) and allowed to acclimate for 24 hours.
  • the rats were dosed orally with FVIIa-Fc homodimer, or monomer/dimer hybrid(consisting of two Fc chains, one of which was linked to Fc-VII).
  • a volume of 200 ⁇ l of a FVIIa-Fc solution was used for a dose of 1 mg/kg.
  • the solution was comprised of a Tris-HCl buffer pH 7.4 with 5 mg/ml soybean trypsin inhibitor.
  • the rats were euthanized with CO 2 at several time points, and 200 ⁇ l of blood was drawn by cardiac puncture.
  • Plasma was obtained by the addition of a ⁇ fraction (1/10) ⁇ volume 3.8% sodium citrate solution and centrifuged at room temperature at a speed of 1268 ⁇ g.
  • the plasma samples were either used in the assays fresh or frozen at ⁇ 20° C.
  • the Asserachrom Factor VII:Ag ELISA was performed on the minipig samples.
  • a Factor VII:Ag Elisa assay was purchased from Diagnostica Stago (Parsippany, N.J.) and preformed as described in the kit manual with one change.
  • the standard for the standard curve was replaced with purified Factor VIIa-Fc.
  • the standard was run in the same percent normal animal plasma as being analyzed. Plasma levels of intravenously administered monomer/dimer hybrid are shown in FIG. 8A .
  • the half life was determined to be 9.4 hours.
  • a time course assay using monomer/dimer hybrid chimeric protein demonstrated sustained plasma levels of intravenously administered Factor VIIa-Fc over time with a T 1/2 of 22 hours ( FIG. 8A ).
  • Clotting activity using was measured by the StaClot FVIIa-rTF assay kit ( FIG. 8B ).
  • the T 1/2 for clotting was found to be 6.4 hours for one pig and 5.7 for the other pig.
  • the human Factor IX coding sequence was obtained by RT-PCR amplification from adult human liver RNA using the following primers: (SEQ ID NO: 21) natFIX- 5′-TTACTGCAGAAGGTTATGCAGCGCGTGAACATG- F: 3′ (SEQ ID NO: 22) F9-R: 5′-TTTTTCGAATTCAGTGAGCTTTGTTTTTTCCTTAATCC- 3′
  • the fragment was gel purified using Qiagen Gel Extraction Kit (Qiagen, Valencia, Calif.), and digested with PstI-EcoRI, gel purified, and cloned into the corresponding digest of the pED.dC.XFc plasmid.
  • the amino acid and DNA sequences of factor IX-Fc are shown in FIG. 9 .
  • CHO DG-44 cells expressing Factor IX-Fc were established. DG44 cells were plated in 100 mm tissue culture petri dishes and grown to a confluency of 50%-60%. A total of 10 ⁇ g of DNA was used to transfect one 100 mm dish: for the homodimer transfection, 8 ⁇ g of pED.dC.Factor IX-Fc+2 ⁇ g of pcDNA6-PACE was used; for the monomer-dimer hybrid transfection, 8 ⁇ g of pED.dC.Factor IX-Fc+1 ⁇ g of pcDNA3-FlagFc+1 ⁇ g pcDNA6-PACE was used.
  • the cells were transfected as described in the Superfect transfection reagent manual (Qiagen, Valencia, Calif.). The media was removed from transfection after 48 hours and replaced with MEM Alpha without nucleosides plus 5% dialyzed fetal bovine serum and 10 ⁇ g/ml of Blasticidin (Invitrogen, Carlsbad, Calif.) for both transfections, while the monomer-dimer hybrid transfection was also supplemented with 0.2 mg/ml geneticin (Invitrogen, Carlsbad, Calif.). After 3 days, the cells were released from the plate with 0.25% trypsin and transferred into T25 tissue culture flasks, and the selection was continued for 10-14 days until the cells began to grow well as stable cell lines were established. Protein expression was subsequently amplified by the addition 10 nM or 100 nM methotrexate for the homodimer or monomer-dimer hybrid, respectively.
  • Fresh production medium was added to the roller bottles after each collection and the bottles were returned to the incubator. Prior to chromatography, the medium was clarified using a SuporCap-100 (0.8/0.2 ⁇ m) filter from Pall Gelman Sciences (Ann Arbor, Mich.). All of the following steps were performed at 4° C. The clarified medium was applied to Protein A Sepharose, washed with 5 column volumes of 1X PBS (10 mM phosphate, pH 7.4, 2.7 mM KCl, and 137 mM NaCl), eluted with 0.1 M glycine, pH 2.7, and then neutralized with 1/10 volume of 1 M Tris-HCl, pH 9.0. The protein was then dialyzed into PBS.
  • 1X PBS 10 mM phosphate, pH 7.4, 2.7 mM KCl, and 137 mM NaCl
  • the monomer-dimer hybrid transfection protein sample was subject to further purification, as it contained a mixture of FIX-Fc:FIX-Fc homodimer, FIX-Fc:Flag-Fc monomer-dimer hybrid, and Flag-Fc:Flag-Fc homodimer. Material was concentrated and applied to a 2.6 cm ⁇ 60 cm (318 ml) Superdex 200 Prep Grade column at a flow rate of 4 ml/minute (36 cm/hour) and then eluted with 3 column volumes of 1 ⁇ PBS. Fractions corresponding to two peaks on the UV detector were collected and analyzed by SDS-PAGE.
  • Fractions from the first peak contained either FIX-Fc:FIX-Fc homodimer or FIX-Fc:FlagFc monomer-dimer hybrid, while the second peak contained FlagFc:FlagFc homodimer. All fractions containing the monomer-dimer hybrid but no FlagFc homodimer were pooled and applied directly to a 1.6 ⁇ 5 cm M2 anti-FLAG sepharose column (Sigma Corp., St. Louis, Mo.) at a linear flow rate of 60 cm/hour. After loading, the column was washed with 5 column volumes PBS. Monomer-dimer hybrids were then eluted with 100 mM Glycine, pH 3.0.
  • Elution fractions containing the protein peak were then neutralized by adding ⁇ fraction (1/10) ⁇ volume of 1 M Tris-HCl, and analyzed by reducing and nonreducing SDS-PAGE. Fractions were dialyzed into PBS, concentrated to 1-5 mg/ml, and stored at ⁇ 80° C.

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