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WO1999009185A1 - Activateur du plasminogene avec zymogenite amelioree - Google Patents

Activateur du plasminogene avec zymogenite amelioree Download PDF

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Publication number
WO1999009185A1
WO1999009185A1 PCT/EP1998/005055 EP9805055W WO9909185A1 WO 1999009185 A1 WO1999009185 A1 WO 1999009185A1 EP 9805055 W EP9805055 W EP 9805055W WO 9909185 A1 WO9909185 A1 WO 9909185A1
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WO
WIPO (PCT)
Prior art keywords
plasminogen activator
clot
plasminogen
activity
protein
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PCT/EP1998/005055
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German (de)
English (en)
Inventor
Richard Engh
Ulrich Kohnert
Martin Renatus
Wolfram Bode
Robert Huber
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Roche Diagnostics Gmbh
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Filing date
Publication date
Application filed by Roche Diagnostics Gmbh filed Critical Roche Diagnostics Gmbh
Priority to AU91621/98A priority Critical patent/AU9162198A/en
Publication of WO1999009185A1 publication Critical patent/WO1999009185A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • 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)
    • C12N9/6456—Plasminogen activators
    • C12N9/6459—Plasminogen activators t-plasminogen activator (3.4.21.68), i.e. tPA
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12Y—ENZYMES
    • C12Y304/00—Hydrolases acting on peptide bonds, i.e. peptidases (3.4)
    • C12Y304/21—Serine endopeptidases (3.4.21)
    • C12Y304/21069—Protein C activated (3.4.21.69)
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K38/00—Medicinal preparations containing peptides

Definitions

  • the invention relates to a plasminogen activator with improved zymogenicity, medicaments for the treatment of thromboembolic disorders, pharmaceutical compositions which contain such a plasminogen activator and their use.
  • Tissue plasminogen activator is a multi-domain serine protease that catalyzes the conversion of plasminogen to plasmin and is used for fibrinolytic therapy.
  • Unmodified human t-PA (hereinafter referred to as t-PA) consists of 527 amino acids in its form in the plasma and can be split into two chains by plasmin, which are then still held together by a disulfide bridge.
  • the A chain (also called heavy chain) consists of four structural domains.
  • the finger domain (amino acids 1-49) shows certain similarities with the finger structures in fibronectin.
  • the growth factor domain (amino acids 50 - 86) is to a certain extent homologous to murine and human epidermal growth factors.
  • the Kringled domains (amino acids 87-261) are largely homologous to the fourth and fifth Kringled domains of plasminogen.
  • the finger and kringle 2 domains of t-PA are particularly involved in fibrin binding and in the stimulation of proteolytic activity by fibrin.
  • the B chain of t-PA (amino acids 276-527, protease domain) is a serine protease and largely homologous to the B chains of urokinase and plasmin (TJR Harris (1987) and J. Krause (1988).
  • the stimulability of the activity by fibrin or by fibrin cleavage products is an essential feature of t-PA, which t-PA from the other known plasminogen activators, such as. B. urokinase or streptokinase differs.
  • the stimulability can be further improved by modifying the amino acid sequence of t-PA.
  • a measure of the stimulability is the ratio of the catalytic efficiency (K ca ⁇ / K m ) in the presence and in the absence of fibrin.
  • K ⁇ is the rate constant of the catalytic reaction and K m is the Michaelis constant.
  • the stimulability of t-PA can increase 19 to 81 times (EL Madison et al., Science 262 (1993) 419-421.
  • t-PA derivatives which are modified in the region of the amino acids 272-280, in particular in the region 274-277 and additionally in the region of the glycosylation sites (117-119 and 184-186).
  • Such t-PA derivatives have improved proteolytic and plasminogenolytic activity, a reduced sensitivity to inhibition, an improved affinity for fibrin and / or improved fibrin dependence of the plasminogenolytic activity.
  • the mechanism of action of t-PA in vivo is, for example, in Korninger and Collen, Thromb. Haemostasis 46 (1981) 561-565.
  • t-PA activates plasminogen to plasmin. Plasmin splits fibrin into soluble fibrin products.
  • Natural human tPA and also recombinantly produced t-PA are usually essentially in single-chain form.
  • Single-chain t-PA is cleaved in the blood by protease / plasmin between amino acid 275 (arginine) and 276 (isoleucine) in two-chain t-PA, which increases activity.
  • the two partial chains remain connected by a cysteine bridge.
  • the amidolytic activity of single-chain t-PA catalytic activation of plasminogen to plasmin
  • Dual chain t-PA has greater activity than small chain and plasmin, in the absence of fibrin, than single chain t-PA. However, in the presence of fibrin, the activities of both t-PA forms are approximately the same.
  • WO 90/02798 describes tP-A variants with increased zymogenicity, which contain substitutions, deletions or insertions around position 305, preferably 297-305. Furthermore, zymogenic variants are described which contain an amino acid exchange at other positions, including at position 267. The object of the invention is to provide further t-PA mutants which show improved zymogenicity.
  • the object is achieved by a plasminogen activator of the tissue plasminogen activator type, which is characterized in that the amino acid region G265-F274 is partially or completely deleted.
  • the deletion in the range mentioned enables the zymogenicity to be increased by at least a factor of 2 compared to human t-PA.
  • a plasminogen activator of the tissue plasminogen activator type is to be understood as a plasminogen activator whose sequence is recognizably derived from the sequence of human plasminogen activator.
  • Zymogenicity is the quotient of the activity of the two-chain form and the activity of the single-chain form.
  • the activity is determined amidolytically and can be checked in a static clot-lysis model for confirmation.
  • Such a plasminogen activator achieves high selectivity and effectiveness of thrombus dissolution in vivo with drastically reduced side effects.
  • the amino acid region mentioned according to the invention represents a loop, as can be seen from structural analyzes by the inventors.
  • amino acids 265 - 274 form an "activation loop", which, in confirmation, forms a kind of lid or shield that protects the activation pocket against the ingress of water.
  • this activation pocket contains a salt bridge between D 194 and the N-terminal 1 16. This salt bridge is essential for the development of proteolytic activity.
  • the shield formed by the loop stabilizes a salt bridge between D 194 and K 156 by preventing water from entering. This structural stabilization also stabilizes the activity of the single-chain protein. The result of a shortening or complete removal of the loop is that the activation pocket becomes more accessible and an inactive conformation of the single-chain protein is stabilized.
  • the fibrin binding of the plasminogen activator according to the invention is additionally reduced to such an extent that the plasminogen activator can penetrate more than 50% into a blood clot.
  • Such a plasminogen activator acts specifically on the blood clot and therefore shows significantly fewer side effects than the known plasminogen activators.
  • plasminogen activator which additionally shows no or only very low and non-specific fibrin binding.
  • Such molecules penetrate the inside of the clot and thus ensure an efficient activation of plasminogen to plasmin in the clot.
  • plasminogen activators are based, for example, on the protease domain of t-PA (WO 96/17928) or on a substance which is essentially a t-PA domain. are the Kringle 2 domain and the protease domain, but not the finger domain (WO 90/09437, US Pat. No. 5,223,256, EP-B 0 297 066, EP-B 0 196 920).
  • the reduction in fibrin binding can be done by deleting or mutating the domain of t-PA which is specific for fibrin binding (fibrin binding domain, finger domain) in such a way that fibrin binding via the finger domain cannot or only to a small extent (no functional effective finger domain).
  • the plasminogen activator can penetrate the clot (preferably more than 50%) and is distributed evenly. There it is split by plasmin and unfolds its activity in the active two-chain form. A plasminogen activator, the fibrin binding of which is reduced in this way, no longer shows high-affinity fibrin binding typical of tPA.
  • the combination of a lack of fibrin binding and zymogenicity increases the potency of the plasminogen activator and drastically reduces side effects.
  • the penetration of the plasminogen activator according to the invention into a clot can be determined in an in vitro model. The extent of clot penetration and distribution in the clot can be determined visually.
  • the plasminogen activator described in US Pat. No. 5,223,256 is used as the standard for assessment, which penetrates into the clot, distributes itself homogeneously and thus by definition represents the 100% value (determined at a concentration of 3 ⁇ g / ml).
  • recombinant human tissue plasminogen activator according to EP-B 0 093 619 is used, which by definition does not penetrate the clot and essentially binds to the surface.
  • the investigation of the clot penetration is carried out as described in Example 3c.
  • a comparison of these standards shows that "non-penetration into the clot" means that the vast majority (80% or more) of the plasminogen activator is in the first quarter of the clot, whereas with a "homogeneous distribution" at least 50% of the plasminogen activator penetrate further into the clot and are thus located in the remaining three quarters.
  • the plasminogen activator according to the invention is additionally modified such that it cannot be inhibited by PAI-1.
  • Modification is preferably carried out by mutating amino acids 296-302 (Madison, EL et. Al., Proc. Natl. Acad. Sci. USA 87 (1990) 3530-3533) and particularly preferably by replacing amino acids 296-299 (KHRR) AAAA (WO 96/01312).
  • the compounds according to the invention are thrombolytically active proteins which, in contrast to t-PA (Alteplase), are preferably administered as i.v. Bolus injection are suitable. They are effective in a lower dose and show practically the same thrombolytic effect as a clinically customary infusion of Alteplase.
  • t-PA Alteplase
  • the compounds according to the invention can advantageously also be used in the case of acute diseases, such as heart attack or pulmonary embolism.
  • the plasminogen activators used according to the invention can be produced in eukaryotic or prokaryotic cells by the methods familiar to the person skilled in the art.
  • the compounds according to the invention are preferably produced by genetic engineering. Such a process is described, for example, in WO 90/09437, EP-A 0 297 066, EP-A 0 302 456, EP-A 0 245 100 and EP-A 0 400 545, which are the subject of the disclosure for such production processes .
  • Mutations can be introduced into the cDNA of t-PA or a derivative thereof by "oligonucleotide-directed site-specific mutagenesis". leads.
  • the "site-specific mutagenesis” is described, for example, by Zoller and Smith (1984), modified from TA Kunkel (1985) and Morinaga et al. (1984).
  • the method of PCR mutagenesis which is described, for example, in Ausubel et al. (1991).
  • the nucleic acid obtained in this way serves to express the plasminogen activator used according to the invention if it is present on an expression vector suitable for the host cell used.
  • nucleic acid sequence of the protein according to the invention can additionally be modified. Such modifications are, for example:
  • non-glycosylated plasminogen activators used according to the invention are either produced in eukaryotic host cells, the glycosylated product initially obtained thereby having to be deglycosylated by methods familiar to the person skilled in the art, or preferably by expression in non-glycosylating host cells, particularly preferably in prokaryotic host cells.
  • E. coli, Streptomyces spec. are prokaryotic host organisms. or Bacillus subtilis.
  • the prokaryotic cells are fermented in a conventional manner and, after the bacteria have been digested, the protein is isolated in a conventional manner. If the protein is obtained in an inactive form (inclusion bodies), it is solubilized and naturalized according to the methods familiar to the person skilled in the art. It is also possible according to the methods familiar to the person skilled in the art to secrete the protein from the microorganisms as the active protein.
  • An expression vector suitable for this preferably contains a signal sequence which is suitable for the secretion of proteins in the host cells used, and the nucleic acid sequence which codes for the protein.
  • the protein expressed with this vector is secreted either into the medium (for gram-positive bacteria) or into the periplasmic space (for gram-negative bacteria).
  • the signal sequence and the sequence coding for the t-PA derivative according to the invention there is expediently a sequence which codes for a cleavage site which allows the protein to be split off either during processing or by treatment with a protease.
  • the selection of the base vector into which the DNA sequence coding for the plasminogen activator according to the invention is introduced depends on the host cells used later for expression. Suitable plasmids and the minimum requirements placed on such a plasmid (eg origin of replication, restriction sites) are familiar to the person skilled in the art. In the context of the invention, a cosmid, the replicative double-stranded form of phage ( ⁇ , Ml 3) or other vectors known to the person skilled in the art can also be used instead of a plasmid.
  • the plasminogen activators according to the invention When producing the plasminogen activators according to the invention in prokaryotes without secretion, it is preferred to separate the forming inclusion bodies from the soluble cell particles, to solubilize the inclusion bodies containing the plasminogen activator by treatment with denaturing agents under reducing conditions, then to derivatize them with GSSG and to add the plasminogen activator to be renatured from GSH and from denaturing agents in non-denaturing concentration or from L-arginine.
  • Such methods for activating t-PA and derivatives from inclusion bodies are described, for example, in EP-A 0 219 874 and EP-A 0 241 022. However, other methods of obtaining the active protein from the inclusion bodies can also be used.
  • the plasminogen activators according to the invention are preferably purified in the presence of L-arginine, in particular at an arginine concentration of 10-1000 mmol / l.
  • Foreign proteins are preferably separated off by affinity chromatography and particularly preferably via an adsorber column on which ETI (Erythrina Trypsin Inhibitor) is immobilized.
  • Sepharose® for example, is used as the carrier material.
  • Cleaning via an ETI adsorber column has the advantage that the ETI adsorber column material can be loaded directly from the concentrated renaturation batch even in the presence of such high arginine concentrations as 0.8 mol / 1.
  • the plasminogen activators according to the invention are preferably purified via an ETI adsorber column in the presence of 0.6-0.8 mol / 1 arginine.
  • the solution used here preferably has a pH of more than 7, particularly preferably between 7.5 and 8.6.
  • the plasminogen activators according to the invention are eluted from the ETI column by lowering the pH both in the presence and in the absence of arginine.
  • the pH is preferably in the acidic range, particularly preferably between pH 4.0 and 5.5.
  • Another object of the invention is a pharmaceutical composition containing a thrombolytically active protein according to the invention, the protein preferably containing the protease domain and optionally the Kringel 2 domain of the human tissue plasminogen activator as the only structure causing the thrombolytic activity.
  • the plasminogen activators used according to the invention can be formulated for the production of therapeutic agents in a manner familiar to the person skilled in the art, the compounds according to the invention usually being combined with a pharmaceutically acceptable carrier.
  • Such compositions typically contain an effective amount of 0.1-7 mg / kg, preferably 0.7-5 mg / kg and particularly preferably 1-3 mg / kg body weight as a dose.
  • the therapeutic compositions are usually in the form of sterile, aqueous solutions or sterile, soluble dry formulations such as lyophilisates.
  • the compositions usually contain a suitable amount of a pharmaceutically acceptable salt used to prepare an isotonic solution. Buffers such as arginine buffers and phosphate buffers can also be used to stabilize a suitable pH (preferably 5.5-7.5).
  • the amount of the dosage of the compounds according to the invention can be easily determined by any person skilled in the art. It depends, for example, on the type of application (infusion or bolus) and the duration of the therapy. Because of their prolonged plasma half-life, the compounds according to the invention are particularly suitable for a bolus application (single bolus, multiple bolus).
  • a suitable form for a bolus application is, for example, an ampoule which contains 25-1000 mg of the compound according to the invention, a substance which improves the solubility of the plasminogen activator (such as tranexamic acid) and buffer. It is preferably used intravenously, but also subcutaneously, intramuscularly or intraarterially. Plasminogen activators according to the invention can also be infused or applied locally.
  • the compounds according to the invention can be used as a multiple bolus (preferably as a double bolus). Suitable time intervals are between 20 and 180 minutes, an interval between 30 and 90 minutes is particularly preferred and a is particularly preferred Interval between 30 and 60 minutes preferred. In addition, infusion over a longer period of time is also possible.
  • the compounds according to the invention are particularly suitable for the treatment of all thromboembolic disorders, such as e.g. acute heart attack, cerebral infarction, pulmonary embolism, deep leg vein thrombosis, acute arterial occlusion, etc.
  • thromboembolic disorders such as e.g. acute heart attack, cerebral infarction, pulmonary embolism, deep leg vein thrombosis, acute arterial occlusion, etc.
  • an infusion over several days e.g. 1-4 days
  • the compounds according to the invention are particularly preferably used for the treatment of subchronic thromboembolic disorders in which prolonged thrombolysis has to be carried out.
  • an anticoagulant such as. B. heparin and / or an inhibitor of platelet aggregation, whereby the vascular opening effect is increased with minor side effects.
  • the administration of anticoagulants can take place at the same time or with a time delay when the compound according to the invention is administered.
  • the addition of substances that promote blood circulation or substances that improve the microcirculation is particularly preferred.
  • RPA is further understood to mean a recombinant plasminogen activator which consists of the domains K2 and P of human tPA.
  • the production of such plasminogen activators is described, for example, in US Pat. No. 5,223,256.
  • FIG. 1 is a schematic representation of the plasma clot penetration model. In order to avoid coagulation of the plasma induced by shear forces, the pressure was generated by a buffer compartment (hatched). Mixing of buffer and plasma over the clot (dotted) was prevented by using a bubble trap.
  • 1st buffer reservoir
  • 2nd peristaltic pump
  • 3rd bubble trap
  • 4th syringe for the injection of the fibrinolytic agent
  • 5th pipette tip with clot (double hatched)
  • 6th hose clamp
  • 7th pressure element.
  • the starting plasmid pA27fd contains the following components: tac promoter, lac operator region with an ATG start codon, the coding region for the t-PA mutein, consisting of the Kringle 2 domain and the Protease domain and the fd transcription terminator.
  • the starting vector represents the plasmid pkk 223-3.
  • fragment A the large BamHI fragment
  • fragment B the vector linearized with Pvu I
  • CTCCACCTGCAGACAGTACA SEQ ID NO: 1
  • the heteroduplex batch was transformed together with the plasmid pUBS520 into E. coli (Brinkmann et al., Gene 85 (1989) 109).
  • the transformants were selected by adding ampicillin and kanamycin (50 ⁇ g / ml each) to the nutrient medium.
  • buffer 50 mmol / 1 Tris-HCl pH8, 50 mmol / 1 EDTA
  • the rabbit model of neck vein thrombolysis established by D. Collen (J. Clin. Invest. 71 (1983) 368-376) was used to test the thrombolytic potency and efficiency of the proteins according to the invention.
  • a radiolabelled thrombus was created in the animals in the cervical vein. The animals were subcutaneously anticoagulated with 100 IU / kg heparin.
  • Alteplase recombinant wild-type tissue plasminogen activator, "t-PA", commercially available as Actilyse® from Thomae, Biberach, Germany
  • the placebo group received a single bolus intravenous injection of 1 mg / kg solvent.
  • the Alteplase group received a total dose of 1.45 mg / kg intravenously, 0.2 mg / kg as an initial bolus injection, 0.75 mg / kg as a 30-minute infusion, immediately followed by 0.5 mg / kg as 60 -minute continuous infusion (total infusion: 90 min.).
  • the streptokinase group received a 60 minute intravenous infusion of 64,000 IU / kg.
  • the group with the protein according to the invention received an intravenous single bolus injection.
  • thrombolysis thrombolysis
  • Blood samples for obtaining plasma were taken before therapy and two hours after the start of therapy.
  • the activated thromboplastin time was measured using standard methods.
  • Blood loss due to thrombolytic therapy was also quantified. For this purpose, a defined skin incision of 4 cm in length and 0.3 cm in depth was added to the animals on the thigh before administration of the thrombolytics using a template and a scalpel. The resulting bleeding stopped due to natural coagulation.
  • the wound was treated Sponge laid, which sucked up the blood from the bleeding newly started by thrombolysis.
  • the amount of blood leaked was measured by weighing the sponge (after deducting its own weight) and thus the extent of the bleeding side effect was described.
  • Alteplase and the proteins according to the invention from Example 1 are thrombolytically highly active substances and, compared to the solvent control, significantly dissolved the thrombi.
  • the sample is prepared by adding buffer (0.06 M Na2HP04, pH 7.4, 5 mg / ml BSA (bovine serum albumin), 0.01% Tween® were mixed with 1 ml human fibrinogen solution (IMCO)
  • Thrombin solution (30 U / ml 0.06 M Na 2 HPO4, pH 7.4, 0.5 mg / ml BSA, 0.01% Tween® 80) was added and the test mixture was incubated again at 37 ° C. After two minutes, one
  • 800 ⁇ l human citrate plasma (healthy donor) are mixed with 75 ⁇ l Ca buffer (50 mmol / 1 Tris / HCl, pH 7.2, 0.25 mol / 1 CaCl 2 ), 20 ⁇ l gelatin solution (10% w / v) in 0.9% NaCl) and 100 ml thrombin solution (8 U / ml, 0.05 mol / 1 sodium citrate / HCl, pH 6.5, 0.15 mol / l NaCl). 800 ⁇ l of this mixture are carefully transferred into a 2 ml column (Pierce, Rockfort, IL, USA). A plasma clot is formed by incubation for three hours at 37 ° C. 2 ml buffer (0.008 mol / 1 Na 2 HPO, 0.001 mol / 1 KH 2 PO 4 , 0.003 mol / 1 KC1,
  • the surface of the clot is washed with 2 ml PBS buffer (0.008 mol / 1 Na 2 HPO 4 , 0.001 mol / 1 KH 2 PO, 0.003 mol / 1 KC1 and 0.137 mol / 1 NaCl) and the protein is fixed by adding 2 ml glutardialdehyde solution in PBS.
  • the clot surface is then washed with 2 ml of 50 mmol / 1 Tris / HCl, pH 8.0 and incubated with 1 ml of peroxidase-labeled polyclonal antibodies against t-PA (250 mU / ml). After washing the clot with 1 ml of PBS, the antibody-bound protein is determined by incubation with 3-amino-9-ethylcarbazole, which is converted into an insoluble red color by peroxidase.
  • Plasminogen activators according to the invention are not concentrated on the surface of the clot, but penetrate into the clot and are distributed evenly. The intensity of the immunologically colored part of the clot increases with increasing concentration of the plasminogen activators according to the invention in the plasma.
  • Example 4
  • the thrombolytically active proteins of Example 1 are tested for their ability to bind to fibrin and compared with this with Alteplase.
  • Samples of Alteplase and a protein according to the invention were prepared as solutions of 1.5 ⁇ g protein ml. Subsequently, samples (100 ⁇ l) of the thrombolytically active protein were each treated with 770 ⁇ l buffer (0.05 M Tris / HCl, pH 7.4, 0.15 NaCl, 0.01% Tween® 80), 10 ⁇ l bovine serum albumin solution ( 100 mg / ml), 10 ⁇ l aprotinin (3.75 mg / ml), 10 ⁇ l bovine thrombin (concentration 100 U / ml) and increasing amounts of fibrinogen (10 ⁇ g / ml to 300 ⁇ g / ml) mixed. All of the solutions were aqueous. Thrombin is known to convert fibrinogen to an insoluble fibrin clot.
  • the components were mixed and incubated at 37 ° C for one hour.
  • the supernatant was then separated from the fibrin clot by centrifugation (15 minutes, 13,000 rpm, at 4 ° C.) and the amount of plasminogen activator protein present in the supernatant was determined by an ELISA using its own standard curve for each variant.
  • the fibrinogen fragments acting as stimulator were prepared by treating human fibrinogen with cyanogen bromide (1 g human fibrinogen, 1.3 g CNBr in 100 ml water) in 70% v / v formic acid over a period of 17 hours at room temperature, followed by Dialysis against distilled water.
  • E Probe ( E Probe t - E BV t) ⁇ ( E Probe 0 - E BV o)
  • test buffer 0.1 mol / 1 Tris, pH 7.5, 15% Tween® 80
  • t-PA stimulator (1 mg / ml cyanogen bromide fragments from human fibrinogen) 1 ml substrate solution (3 mmol / 1 S2251, H-D-Val-Leu-Lys-pNA; Chromogenix, Moelndal,
  • the activity in the presence of the t-PA stimulator is divided by the activity in the absence of the t-PA stimulator.
  • the dilution should be such that an almost identical absorbance is achieved in both preparations. 1 ml H 2 O is added to the reaction mixture without t-PA stimulator instead of 1 ml t-PA stimulator.
  • the activity is measured in the same way both in the absence and in the presence of the stimulator.
  • the stimulation factor F is calculated as follows:
  • the specific activity is the quotient of plasminogenolytic activity (KU / ml) and protein concentration (mg / ml).
  • the thrombolysis by the proteins of Example 1 produced in E. coli can be evaluated in a dog model of thrombosis of the left coronary artery induced by electrical stimulation.
  • r-PA ⁇ G265, L266
  • plasmin-Sepharose 5 mg of plasmin ml of Sepharose
  • Sepharose is removed by centrifugation.
  • amidolytic activity of r-PA ( ⁇ G265, L266) and t-PA was determined as described in Example 7.
  • the zymogenicity was calculated as the quotient of the specific activity of the two-chain form and the single-chain form and is significantly increased compared to t-PA.

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Abstract

L'invention concerne un activateur du plasminogène de type activateur du plasminogène du tissu, dans lequel la zone d'acides aminés G265-F274 est partiellement ou complètement supprimée. Cet activateur présente une zymogénité améliorée qui réduit les effets secondaires en cas d'application thérapeutique.
PCT/EP1998/005055 1997-08-13 1998-08-10 Activateur du plasminogene avec zymogenite amelioree WO1999009185A1 (fr)

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EP97113937.3 1997-08-13
EP97113937 1997-08-13

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002798A1 (fr) * 1988-09-02 1990-03-22 Genentech, Inc. Activateur de plasminogene tissulaire presentant des proprietes specifiques zymogenes ou specifiques a la fibrine
EP0382174A1 (fr) * 1989-02-07 1990-08-16 Roche Diagnostics GmbH Dérivé de l'activateur tissulaire de plasminogène
WO1996017928A1 (fr) * 1994-12-06 1996-06-13 Boehringer Mannheim Gmbh Utilisation du domaine protease de l'activateur plasminogene humain dans le traitement de maladies thromboemboliques

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990002798A1 (fr) * 1988-09-02 1990-03-22 Genentech, Inc. Activateur de plasminogene tissulaire presentant des proprietes specifiques zymogenes ou specifiques a la fibrine
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