Abstract: Specific amino acid loci of human factor VIII interact with inhibitory antibodies of hemophilia patients who have developed such antibodies after being treated with factor VIII. Modified factor VIII is disclosed in which the amino acid sequence is changed by a substitution at one or more of the specific loci. The modified factor VIII is not inhibited by inhibitory antibodies against the A2 or C2 domain epitopes. The modified factor VIII is useful for hemophiliacs, either to avoid or prevent the action of inhibitory antibodies.

Abstract: The application discloses Factor VIII polypeptides comprising internal deletions of amino acids within the area of residues 741 to 1689, wherein the thrombin cleavage sites at about 741 and about 1689 are present, and a site at about 1648 is not present, as compared to human Factor VIII.

Abstract: Specific amino acid loci of human factor VIII interact with inhibitory antibodies of hemophilia patients who have developed such antibodies after being treated with factor VIII. Modified factor VIII is disclosed in which the amino acid sequence is changed by a substitution at one or more of the specific loci. The modified factor VIII is not inhibited by inhibitory antibodies against the A2 or C2 domain epitopes. The modified factor VIII is useful for hemophiliacs, either to avoid or prevent the action of inhibitory antibodies.

Abstract: Specific amino acid loci of human factor VIII interact with inhibitory antibodies of hemophilia patients after being treated with factor VIII. Modified factor VIII is disclosed in which the amino acid sequence is changed by a substitution at one or more of the specific loci. The modified factor VIII is useful for hemophiliacs, either to avoid or prevent the action of inhibitory antibodies.

Abstract: The development of inhibitory antibodies to blood coagulation factor VIII (fVIII) results in a severe bleeding tendency. These antibodies arise in patients with hemophilia A (hereditary fVIII deficiency) who have been transfused with fVIII. They also occur in non-hemophiliacs, which produces the condition acquired hemophilia. We describe a method to construct and express novel recombinant fVIII molecules which escape detection by existing inhibitory antibodies (low antigenicity fVIII) and which decrease the likelihood of developing inhibitory antibodies (low immunogenicity fVIII). In this method, fVIII is glycosylated at sites that are known to be antibody recognition sequences (epitopes). This produces the desired properties of low antigenicity fVIII and low (immunogenicity fVIII. The mechanism is similar to one used by viruses such as the AIDS virus, which glycosylates its surface proteins to escape detection by the immune system.

Abstract: Novel polypeptides or derivatives comprising the factor VIIIa binding site on factor IXa are disclosed. The novel polypeptides or derivatives have anti-coagulation activity. Nucleic acids encoding those polypeptides are also disclosed. Methods for identifying an agent having anti-coagulation activity are also disclosed. These methods comprise determining whether the agent displaces the polypeptide or derivative from its factor VIIa binding site. The agent identified in these methods is also useful in methods for treating a patient to prevent thrombosis. The treatment methods comprise administration of the agent to the patient. Additional methods are also disclosed for treating a patient to prevent thrombosis, comprising treating the patient with a polypeptide or derivative comprising the factor VIIIa binding site on factor IXa. Methods of preventing coagulation in a blood sample are also disclosed, comprising adding the polypeptides or derivatives described above to the blood sample.

Abstract: Hybrid proteins which affect blood coagulation comprise a region from a donor anticoagulant or antithrombotic protein, and the resulting hybrid protein has a modified biological activity. Information concerning the hybrid proteins implicates DNA sequences encoding the proteins and hosts, including transgenic animals, that possess these DNA sequences; antibodies directed against hybrid proteins; methods of modifying the properties of proteins; and treatment methods employing hybrid proteins.

Abstract: The present invention is directed to the generation of antibodies which preferentially bind to fibrinogen fragments E1, E2, and E3, but exhibit little or no cross-reactivity against fibrin monomer and fibrinogen. Thus, the invention provides synthetic peptides containing defined amino acid sequences corresponding to the carboxy terminal regions of the E fragments which arise as a result of plasmin cleavage of fibrin and fibrinogen. The synthetic peptides may be synthesized chemically, or through genetic manipulations, and may contain additional amino acid sequences which are not contiguous with the defined E fragment sequences.

Abstract: Hybrid proteins which affect blood coagulation comprise a region from a donor anticoagulant or antithrombotic protein, and the resulting hybrid protein has a modified biological activity. Information concerning the hybrid proteins implicates DNA sequences encoding the proteins and hosts, including transgenic animals, that possess these DNA sequences; antibodies directed against hybrid proteins; methods of modifying the properties of proteins; and treatment methods employing hybrid proteins.

Abstract: A hybrid procoagulant factor VIII is produced by isolation and recombination of human and other nonhuman mammalian factor VIII subunits or domains, or by genetic engineering of the human and animal factor VIII genes. Subunits or domains of factor VIII that have been purified from human or animal plasma are isolated, and hybrid human/animal factor VIII is produced by (1) mixing either animal heavy chain subunits with human light chain subunits or by mixing human heavy chain subunits with animal light chain subunits, thereby producing human light chain/animal heavy chain and human heavy chain/animal light chain hybrid molecules; or by (2) mixing one or more domains of one species with one or more domains of the other species. These hybrid molecules are isolated by ion exchange chromatography.

Abstract: Recombinant protein complexes having human Factor VIII:C activity are expressed in a eukaryotic host cell by transforming the host cell with first and second expression cassettes encoding a first polypeptide substantially homologous to human Factor VIII:C A domain and a second polypeptide substantially homologous to human Factor VIII:C C domain, respectively. In the present invention, the first polypeptide may be extended having at its C-terminal a human Factor VIII:C B domain N-terminal peptide, a polypeptide spacer of 3-40 amino acids, and a human Factor VIII:C B domain C-terminal peptide. Expression of the second polypeptide is improved by employing an .alpha..sub.1 -antitrypsin signal sequence.

Abstract: Provided is a hybrid Factor VIII having a sequence of amino acids selected from the group of A2 domain fragments 373-540, 373-508, 445-508, 484-508, 404-508, 489-508 and 484-489 according to Seq ID NO 2 substituted with corresponding sequence of porcine or murine Factor VIII. Invention also relates to methods of treatment Factor VIII deficiency with said hybrid Factor VIII.

Abstract: Functional human factor VIII produced recombinantly is used in the treatment of human beings diagnosed to be deficient in factor VIII coagulant activity. Also provided are DNA isolates and expression vehicles encoding functional human factor VIII, as well as transformed host cells and processes for producing human factor VIII by use of recombinant DNA technology.

Abstract: A hybrid human/animal coagulation factor VIII is produced by isolation and recombination of human and other non-human mammalian factor VIII subunits or domains, or by genetic engineering of the human and animal factor VIII genes. Subunits or domains of factor VIII that have been purified from human or animal plasma are isolated, and hybrid human/animal factor VIII is produced by (1) mixing either animal heavy chain subunits with human light chain subunits or by mixing human heavy chain subunits with animal light chain subunits, thereby producing human light chain/animal heavy chain and human heavy chain/animal light chain hybrid molecules; or by (2) mixing one or more domains of one species with one or more domains of the other species. These hybrid molecules are isolated by ion exchange chromatography.

Abstract: Functional human factor VIII produced recombinantly is used in the treatment of human beings diagnosed to be deficient in factor VIII coagulant activity. Also provided are DNA isolates and expression vehicles encoding functional human factor VIII, as well as transformed host cells and processes for producing human factor VIII by use of recombinant DNA technology.

Abstract: Functional human factor VIII produced recombinantly is used in the treatment of human beings diagnosed to be deficient in factor VIII coagulant activity. Also provided are DNA isolates and expression vehicles encoding functional human factor VIII, as well as transformed host cells and processes for producing human factor VIII by use of recombinant DNA technology.

Abstract: Functional human factor VIII produced recombinantly is used in the treatment of human beings diagnosed to be deficient in factor VIII coagulant activity. Also provided are DNA isolates and expression vehicles encoding functional human factor VIII, as well as transformed host cells and processes for producing human factor VIII by use of recombinant DNA technology.

Abstract: A coagulation active complex of Factor VIII fragments is produced by causing coagulation inactive FVIII heavy chain to react with coagulation inactive FVIII light chain in the presence of a complex forming agent. Thus, FVIII-HC and FVIII-LC are converted to coagulation active FVIII complex in the presence of divalent metal ions, such as Mn.sup.2+, Ca.sup.2+ or C.sup.2+, or a component of the pro-thrombin complex.

Abstract: Stable, highly purified Factor VIII protein formulations are provided in high ionic strength media which comprises: sodium chloride, potassium chloride or mixtures thereof; calcium chloride; and histidine as the buffering agent.

Abstract: A hybrid human/porcine coagulation factor VIII is produced by isolation and recombination of human and porcine factor VIII subunits, or by genetic engineering of the human and porcine factor VIII genes. Subunits of factor VIII that have been purified from human or porcine plasma are isolated, and hybrid human/porcine factor VIII is produced by mixing either porcine heavy chain subunits with human light chain subunits or by mixing human heavy chain subunits with porcine light chain subunits, thereby producing human light chain/porcine heavy chain and human heavy chain/porcine light chain hybrid molecules. These hybrid molecules are isolated by ion exchange chromatography. Alternatively, recombinant DNA methods are used to swap elements of porcine factor VIII for the corresponding elements of human factor VIII to produce hybrid human/porcine factor VIII.

Abstract: This invention relates to recombinant Factor VIII:c variants, methods to produce the variants and pharmaceutical compositions containing same. The variants of this invention are characterized by modification of one or more specific proteolytic cleavage sites encompassing the arginine residues at positions 226, 336, 562, 740, 776, 1313, 1648, or 1721. The variants possess similar procoagulant activity to that of human Factor VIII:c.

Abstract: A hybrid human/porcine coagulation factor VIII is produced by isolation and recombination of human and porcine factor VIII subunits, or by genetic engineering of the human and porcine factor VIII genes. Subunits of factor VIII that have been purified from human or porcine plasma are isolated, and hybrid human/porcine factor VIII is produced by mixing either porcine heavy chain subunits with human light chain subunits or by mixing human heavy chain subunits with porcine light chain subunits, thereby producing human light chain/porcine heavy chain and human heavy chain/porcine light chain hybrid molecules. These hybrid molecules are isolated by ion exchange chromatography. Alternatively, recombinant DNA methods are used to swap elements of porcine factor VIII for the corresponding elements of human factor VIII to produce hybrid human/porcine factor VIII.

Abstract: Fibrin binding peptides disclosed include (a) peptides having the amino acid sequence of a human Blood Coagulation Factor XIIIA fragment (i.e., NKLIVRRGQSFYVQIDFSRPYDPRRDLFRVEYVIGRYPQENKGTYIPVPIVSELQSGKWGAKIVMREDR SVRLSIQSSPKCIVGKFRMYVAVWTPYGVLRTSRNPETDTYILFNPWCEDDAVYLDNEKEREEYVLNDIGVIFY GEVNDIKTRSWSYGQF-R', where R, is --CONH.sub.2 or --NH.sub.2); (b) peptides which are fragments of the foregoing Factor XIIIA fragment and which retain the capability thereof of binding to fibrin; and (c) peptides which bind to fibrin, which have the amino acid sequence of any of the foregoing peptides, and which have additional amino acid residues attached to the N-terminal end and/or the C-terminal end thereof.The peptides are useful for localizing blood clots in vivo, inhibiting fibrin stabilization, and promoting thrombolysis.

Abstract: An improved method for producing Factor VIII:c-type proteins is disclosed which involves culturing mammalian cells which are capable of expressing the protein. In accordance with this invention the cells are cultured in a medium containing an effective amount of a substance comprising (a) von Willebrand Factor-type protein, (b) a phospholipid or phospholipid mixture, or a mixture of (a) and (b).

Abstract: An improved method for producing Factor VIII:c is disclosed. The method involves culturing mammalian cells which contain DNA encoding Factor VIII:c and which are capable of expressing Factor VIII:c. In accordance with this invention the cells are cultured in a medium containing an effective amount of a Factor VIII:c-stabilizing substance comprising (a) von Willebrand Factor (VWF), (b) a phospholipid or phospholipid mixture, or a mixture of (a) and (b).