WO2024256742A1 - Antídoto - Google Patents
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- WO2024256742A1 WO2024256742A1 PCT/ES2024/070374 ES2024070374W WO2024256742A1 WO 2024256742 A1 WO2024256742 A1 WO 2024256742A1 ES 2024070374 W ES2024070374 W ES 2024070374W WO 2024256742 A1 WO2024256742 A1 WO 2024256742A1
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- antidote
- antithrombin
- heparin
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
- A61K38/16—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- 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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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P7/00—Drugs for disorders of the blood or the extracellular fluid
- A61P7/04—Antihaemorrhagics; Procoagulants; Haemostatic agents; Antifibrinolytic agents
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
- C07K14/81—Protease inhibitors
- C07K14/8107—Endopeptidase (E.C. 3.4.21-99) inhibitors
- C07K14/811—Serine protease (E.C. 3.4.21) inhibitors
- C07K14/8121—Serpins
- C07K14/8128—Antithrombin III
Definitions
- the present invention falls within the pharmaceutical sector and refers to an antidote against heparins and their medical use in the treatment of hemorrhagic risk.
- Heparin is a highly sulfated glycosaminoglycan. It has the highest density of negative charges known in a biological molecule. It is an anticoagulant drug that acts by preventing the formation and spread of clots within the blood, but is not capable of breaking up or lysing the clot already formed. It is used for the treatment of deep vein thrombosis and pulmonary embolism, acute coronary syndrome, atrial fibrillation, cardiopulmonary bypass, extracorporeal circulation, hemodialysis and central or peripheral venous catheters. The main complication of heparin treatment is bleeding and thrombocytopenia, which involves a decrease in the number of circulating platelets in the bloodstream below normal levels.
- heparin acts as a cofactor for antithrombin.
- Unfractionated heparin is the only physiological heparin. It is isolated from mast cells present in the intestinal mucosa of pigs or bovines. Low molecular weight heparins are obtained by chemical or enzymatic fragmentation from unfractionated heparins. These heparins also have different actions. Unfractionated heparins have mainly an anti-Flla action, while low molecular weight heparins (LMWH) and pentasaccharide have mainly an anti-FXa action.
- LMWH low molecular weight heparins
- heparins in use are the following:
- DVT deep vein thrombosis
- VTE venous thromboembolism
- Another of the hepatic antidotes described in the literature is based on antithrombin, since it has a hepatic binding domain.
- This recombinant antithrombin lacked one of its 4 glycans, specifically the N135 glycan, which favored a greater affinity for hepatic.
- the incorporation of a proline in position 394 decreased the anticoagulant capacity of antithrombin by 3 orders of magnitude.
- the antidote based on a recombinant antithrombin of the present invention is much better than that described in EP2175877B1 since the mutations it presents with respect to the antithrombin sequence make it expressed better and have greater affinity for heparin.
- the present invention relates to an antidote based on a recombinant antithrombin without the capacity to inhibit the target proteases of coagulation, but with greater affinity for heparin than the wild-type protein.
- the antidote of the present invention is capable of reversing the anticoagulant effect of low molecular weight heparins.
- an antidote and “recombinant antithrombin” are synonyms and are used interchangeably.
- an antidote could also be a molecule capable of binding to heparin and preventing it from acting without needing to be a recombinant antithrombin.
- antithrombin refers to an antithrombin, preferably a human antithrombin, comprising at least one substitution, insertion and/or deletion of one or more amino acids within its amino acid sequence.
- low molecular weight heparins refers to heparin with a weight in the range of about 4000 to 6500 Daltons.
- nucleotide may refer to either ribonucleotide or deoxyribonucleotide, unless otherwise stated.
- the alpha glycoform with 4 N-glycans, is the majority (90-95%), while the beta glycoform, which lacks N-glycosylation at position 135, is the minority (5-10%).
- the generation of the beta glycoform is explained by the presence of a serine residue at position 137 (in the sequence of mature antithrombin, once the signal peptide has been eliminated) and responsible for the N-glycosylation of asparagine (N) 135.
- the presence of serine instead of threonine at position 137 reduces the efficiency of the first process of incorporation of the carbohydrate nucleus into the protein skeleton.
- the inventors have discovered that by introducing the mutations 1039TG>AC to give rise to the change of amino acid M to N and 1044GTG>ACA to give rise to the change of amino acid V to T.
- These mutations produce the addition of a new N-glycan, this glycan is very far from position 135 whose relevance has been explained in the previous paragraph, therefore the technical effect of these mutations is that the secretion of the protein is increased when it is synthesized in vitro, since the glycosylation sites are necessary for the secretion of antithrombin when it is expressed in eukaryotic cells and additionally it allows an affinity for heparin of more than 2.5 times higher than that of Beta-antithrombin since the glycosylation chains are involved in the antithrombin-glycosaminoglycans binding similar to cellular heparin.
- the state of the art only discloses a mutation in the nucleotide sequence corresponding to amino acid 137 to eliminate the N-glycan at position 135 that differentiates Alpha-antithrombin from Beta-antithrombin, however, the introduction of the 2 mutations indicated above allows the introduction of a new N-glycan group in the sequence that allows the antidote of the invention to be secreted better and to have greater affinity for heparin.
- the present invention relates to an antidote comprising
- N is any combination of three nucleotides that does not translate into a serine, threonine, or cysteine
- SEQ ID NO: 1 is the nucleotide sequence of the gene encoding the SERPINC1 protein in Homo sapiens. This sequence is the region between nucleotide 69 and 1463, CDS (Coding Sequence) of Genebank, NM_000488.4 (1552 bp mRNA linear PRI 10-APR-2023)
- mutants encompasses at least one substitution, insertion and/or deletion of one or more nucleotides that results in a change in the amino acid when the sequence is translated.
- the recombinant antithrombin encoded by a variant of SEQ ID NO: 2 may comprise one or more mutations as indicated in the preceding paragraph.
- the technical effect of the 504 TCC>NNN variation is that N-glycosylation of the asparagine residue at position 135 is avoided, which means that antithrombin is in beta conformation instead of alpha glycoform.
- the variation 504 TCC> NNN is 504 T>G, this variation results in the change of amino acid S to A.
- the advantage of this deletion is that the antidote of the invention binds with greater affinity to heparin, thus achieving a substantially reduced capacity to inhibit factor Xa (FXa) and factor II (FII).
- the antidote of the invention comprises a recombinant antithrombin encoded in SEQ ID NO: 3 that has the following mutations with respect to SEQ ID NO: 1
- the recombinant antithrombin encoded by a variant of SEQ ID NO: 3 may comprise one or more mutations as indicated above.
- SEQ ID NO:1 The amino acid sequence encoding SEQ ID NO:1 is found in SEQ ID NO:4. This is the native sequence of human antithrombin disclosed in GenPept NP_000479; 464 aa; linear PRI 10-APR-2023
- the first 32 amino acids of SEQ ID NO: 4 correspond to a signal peptide that is physiologically expressed, but is processed inside the cell so that the protein that is secreted does not contain that peptide because it is proteolyzed, in SEQ ID NO: 5 the same sequence is disclosed but without the signal peptide.
- amino acid sequence translated from SEQ ID NO: 3 is SEQ ID NO: 6, and the amino acid variations are S169A/M347N/V349T/AR425 with respect to SEQ ID NO: 4.
- SEQ ID NO: 7 is identical to SEQ ID NO: 6, but without the first 32 amino acids corresponding to the signal peptide. Therefore, the mutations S169A/M347N/V349T/AR425 of SEQ ID NO: 6 are equivalent to S137A/M315N/V317T/AR393 of SEQ ID NO 7.
- the antidote of the invention comprises a recombinant antithrombin encoded in SEQ ID NO: 7 that has the following mutations Regarding SEQ ID NO:5
- the antidote that is purified once expressed does not have the signal peptide, since it is lost when it moves out of the cell, this would be the functional form of the peptide.
- mutants encompasses at least one substitution, insertion and/or deletion of one or more amino acids within the sequence.
- the recombinant antithrombin encoded by a variant of SEQ ID NO: 7 may comprise one or more mutations as indicated in the previous paragraph.
- the antidote of the invention comprises a recombinant antithrombin encoded in SEQ ID NO: 6 that has the following mutations with respect to SEQ ID NO: 4
- the recombinant antithrombin encoded by a variant of SEQ ID NO: 6 may comprise one or more mutations as indicated above.
- the recombinant antithrombin of the invention has a substantially reduced anticoagulant activity relative to the anticoagulant activity of native antithrombin, or having substantially no anticoagulant activity, said recombinant antithrombin further having: a substantially reduced, or substantially lost, thrombin inhibitory activity, or a reduced or substantially lost factor Xa (FXa) inhibitory activity, or a reduced or substantially lost factor Ha (Fila) inhibitory activity, or a substantially reduced, or substantially lost, thrombin inhibitory activity and factor Xa and factor Ha inhibitory activity.
- FXa reduced or substantially lost factor Xa
- Fila reduced or substantially lost factor Ha inhibitory activity
- the thrombin or factor Xa inhibitory activity is "substantially reduced” means that the activity of antithrombin to inhibit thrombin or factor Xa is reduced compared to said activity in wild-type antithrombin.
- the thrombin or factor Xa inhibitory activity is considered reduced when said activity represents from about 90%, or 80% or 70% or 60% or 50% or 40% or 30% to about 5% of the thrombin or factor Xa inhibitory activity of wild-type antithrombin.
- the anti-Xa and anti-IIa inhibitory activities can be measured with any system known in the state of the art.
- Substantially lost thrombin or factor Xa inhibitory activity means that the activity of antithrombin to inhibit thrombin or factor Xa is absent compared to such activity in wild-type antithrombin.
- treatment refers to the medical treatment of a subject with the intent to cure, ameliorate, stabilize, or prevent a disease, pathological condition, or disorder.
- This term includes active treatment, i.e., treatment specifically directed at the amelioration of a disease, pathological condition, or disorder, and also includes causal treatment, i.e., treatment directed at the elimination of the cause of the associated disease, pathological condition, or disorder.
- this term includes palliative treatment, i.e., treatment designed to alleviate symptoms rather than cure the disease, pathological condition, or disorder; preventative treatment, i.e., treatment directed at partially or completely minimizing or inhibiting the development of the associated disease, pathological condition, or disorder; and supportive treatment, i.e., treatment employed to supplement other specific therapy directed at the amelioration of the associated disease, pathological condition, or disorder.
- palliative treatment i.e., treatment designed to alleviate symptoms rather than cure the disease, pathological condition, or disorder
- preventative treatment i.e., treatment directed at partially or completely minimizing or inhibiting the development of the associated disease, pathological condition, or disorder
- supportive treatment i.e., treatment employed to supplement other specific therapy directed at the amelioration of the associated disease, pathological condition, or disorder.
- treatment although intended to cure, ameliorate, stabilize, or prevent a disease, pathological condition, or disorder, need not actually result in cure, amelioration, stabilization, or prevention.
- the effects of treatment may be measured
- Such measurements and assessments may be made in qualitative and/or quantitative terms.
- the characteristics or features of a disease, pathological condition, or disorder and/or the symptoms of a disease, pathological condition, or disorder may be reduced to any effect or any amount.
- treatment and “treating” refer to the medical management of a subject with the intent to cure, ameliorate, or stabilize such bleeding risk.
- the term “prevent” refers to the administration of the recombinant antithrombin of the invention prior to the onset of clinical symptoms of a disease or condition in order to prevent a physical manifestation of the aberrations associated with the disease or condition.
- the term “prevent” refers to the administration of the recombinant antithrombin of the invention prior to the onset of clinical symptoms of hemorrhagic risk in order to prevent bleeding in the subject.
- the term "subject” includes, but is not limited to, Animals.
- the subject may be a vertebrate, more particularly a mammal (e.g., a human, horse, pig, rabbit, dog, sheep, goat, non-human primate, cow, cat, guinea pig, or rodent), fish, bird, or reptile or amphibian.
- the term does not denote a particular age or sex. Thus, adult and newborn subjects, as well as fetuses, whether male or female, are covered by the definition of subject.
- a patient is a subject afflicted with a disease or disorder.
- patient includes human and veterinary subjects.
- the antidote for use in treating hemorrhagic risk may be administered to a subject comprising a human or an animal, including but not limited to a mouse, dog, cat, horse, bovine or ovine, and the like.
- the "variant" of any of the sequences SEQ_ID NO: 2 or SEQJD NO: 3 encoding the recombinant antithrombin of the invention could have the codon sequence optimized for expression in any host cell (a particular organism or cell type, for example, a human cell line,) in at least 10% of the codons, preferably at least 20% of the codons, more preferably at least 30% of the codons, even more preferably at least 40% of the codons, even more preferably at least 50% of the codons, even more preferably at least 60% of the codons, even more preferably at least 70% of the codons, even more preferably at least 80% of the codons, and even more preferably at least 90% of the codons. Codon optimization does not comprise a change in the amino acid sequence.
- the hemorrhagic risk is produced by the administration of heparin to the subject, said heparin may be one or more of the following, low molecular weight heparin, unfractionated heparin and pentasaccharide, preferably low molecular weight heparins (LMWH) and/or unfractionated heparin (UFH), since as demonstrated later in the embodiment examples, the antidote of the invention comprises a reduced or substantially lost inhibitory activity of factors Ha and Xa.
- LMWH low molecular weight heparins
- UH unfractionated heparin
- heparin has been administered, previously, simultaneously or to the recombinant antithrombin of the invention.
- the antidote of the invention be administered within 24 hours after the subject has been given LMWH or UFH.
- a doctor would know identify the optimal period of time in which the antidote of the invention should be administered to achieve the best anti-hemorrhagic effect, given the risk of hemorrhage.
- Said specialist would monitor the condition of the patient to whom LMWH or UFH has been administered, and if there is bleeding or symptoms of hemorrhage, he would administer the antidote of the invention to the subject.
- the hemorrhagic risk is associated with one or more of the following processes, for which treatment with heparin is indicated: infections, inflammations or hypoxic injuries, in particular sepsis and ischemia/reperfusion related to stroke, ischemia/reperfusion related to surgery and ischemia/reperfusion related to organ transplantation, deep vein thrombosis, pulmonary embolism, acute coronary syndrome, cardiopulmonary bypass, extracorporeal circulation, hemodialysis, central or peripheral venous catheters, venous thromboembolism (VTE) in general surgery when there is renal failure or obesity, treatment of DVT of the lower extremities with or without pulmonary embolism, hip fracture surgery, renal failure, pulmonary thromboembolism and atrial fibrillation.
- infections, inflammations or hypoxic injuries in particular sepsis and ischemia/reperfusion related to stroke, ischemia/reperfusion related to surgery and ischemia/reperfusion related to organ transplantation, deep vein thrombosis, pulmonary embo
- hemorrhagic risk is associated with pulmonary thromboembolism or atrial fibrillation.
- the bleeding risk also includes thrombocytopenia.
- the recombinant antithrombin of the invention may be administered to a subject suffering from, or at risk of suffering from, a hemorrhagic risk with an effective amount of said recombinant antithrombin having reduced or substantially lost factor lia and Xa inhibitory activity.
- the amount may be an amount from a minimum of about 0.1 mg of the recombinant antithrombin per kg of the subject, about 0.2 mg/kg, or about 0.5 mg/kg, to a maximum of about 100 mg/kg, about 200 mg/kg, or up to about 500 mg/kg.
- the amount of recombinant antithrombin exhibiting reduced or substantially lost factor lia and Xa inhibitory activity can be from about 0.1 mg/kg to about 100 mg/kg, from about 0.2 mg/kg to about 200 mg/kg, from about 0.5 mg/kg to about 500 mg/kg, from about 0.1 mg/kg to about 10 mg/kg, from about 0.1 mg/kg to about 20 mg/kg, from about 0.1 mg/kg to about 50 mg/kg, from about 0.5 mg/kg to about 20 mg/kg, from about 0.5 mg/kg to about 50 mg/kg, from about 0.5 mg/kg to about 100 mg/kg, from about 0.5 to about 200 mg/kg, from about 0.5 mg/Kg to about 500 mg/Kg, from about 15 mg/Kg about 25 mg/kg, about 15 mg/kg to about 50 mg/kg, about 18 mg/kg to about 30 mg/kg, about 18 mg/kg to about 50 mg/kg.
- the recombinant antithrombin of the present invention is for occasional use, when there is a risk of bleeding and/or heparin has been administered to a subject, not for sustained use over time unless the subject is being administered one or more doses of heparin continuously over time.
- the antidote of the invention is administered to a subject at a dose of about 20 IU/kg to about 600 IU/kg, preferably about 40 IU/kg to about 300 IU/kg.
- the antidote of the invention can be administered to humans and other animals intravenously, orally, rectally, parenterally, intracisternally, intravaginally, intraperitoneally, topically (as powders, ointments or drops), buccally, as an oral or nasal spray, or the like, preferably intravenously.
- Another additional object of the invention relates to a pharmaceutical composition
- a pharmaceutical composition comprising the antidote of the invention and one or more additional active compounds, and/or one or more pharmaceutically acceptable carriers, adjuvants or vehicles.
- Additional active compounds are all those commonly used in the clinic to prevent the risk of hemorrhage.
- pharmaceutically acceptable is meant a material that is not biologically or otherwise undesirable, that is, the material can be administered to a subject together with the selected compound without causing any undesirable biological effects or interacting in a deleterious manner with any of the other components of the pharmaceutical composition in which it is contained.
- a or an may refer to one or a plurality of the modifying elements (e.g., "a reagent” may mean one or more reagents), unless it is contextually clear that one or more of the elements is being described.
- the term “about” as used herein refers to a value within 10% of the underlying parameter (i.e., plus or minus 10%; e.g., a weight of "about 100 grams” may include a weight between 90 grams and 110 grams).
- FIG. 1 Western blot showing the increased secretion of recombinant antithrombin (antidote) of the invention compared to antithrombin alpha (alpha-AT) and antithrombin beta (beta-AT).
- R-SDS means that the electrophoresis is performed with sodium dodecyl sulphate (SDS) under reducing conditions (with beta-mercaptoethanol or dithiothreitol).
- Figure 3 Graphs showing the activity of the antidote of the invention (recombinant antithrombin) on Fila and FXa.
- PBS is the control and is Phosphate buffered saline.
- FIG. 4 Graph showing FXa activity in mice treated with PBS (control), heparin (HPBM), antidote of the invention (recombinant antithrombin) and the antidote of the invention (recombinant antithrombin) together with heparin (HPBM).
- Vmax means maximum velocity.
- Site-directed mutagenesis was performed on this plasmid using the primers indicated in Table 1. The mutations were performed sequentially in the order indicated in the table from top to bottom. A person skilled in the art would know how to perform such mutations using the general knowledge common in the area and standard laboratory protocols.
- HEK-EBNA eukaryotic cells were transfected for the expression of the recombinant protein.
- the cells were cultured to 60% confluence at 37°C, 5% CO2, in DMEM with GlutaMAX-l medium (Invitrogen), supplemented with 5% FBS (Sigma-Aldrich). 200 g/mL of plasmid was transfected for 30 minutes in OptiMEM with LX (Invitrogen), as suggested by the manufacturer.
- the cells were washed with PBS and changed to CD-CHO medium (Invitrogen) supplemented with 4 mM L-glutamine and 0.25 mg/mL Geneticin (Invitrogen).
- the cells were cultured at 37°C for 10 days.
- the medium was collected and replaced with fresh medium every 2 days.
- the protein was purified by heparin affinity chromatography on HiTrap Heparin columns (GE Healthcare), using an ⁇ KTA Purifier (GE Healthcare) in 100 mM Tris-HCl and 10 mM citric acid, in a gradient of 0.15 to 2 M NaCl. Finally, the protein was eluted and desalted on 5 mL HiTrap Desalting columns (GE Healthcare) and stored at 70°C.
- the protein was obtained with high efficiency, due to its high secretion rate into the medium and its high affinity for heparin. With a single purification step, a homogeneity of over 90% was obtained. This means that the protein is at least 90% pure in the supernatant and that if there are contaminating proteins, they do not exceed 10% of the total. For a single purification step, this is a very high efficiency, which saves time and resources for the production of the antidote of the invention.
- the antidote of the invention was purified from the culture medium harvests by heparin affinity chromatography on HiTrap Heparin columns (GE Healthcare), using an ⁇ KTA purifier (GE Healthcare) in 100 mMTr ⁇ s-HCI pH 7.4 and 10 mM citric acid, in a gradient of 0.15 to 3 M NaCl.
- the antithrombin fractions were applied to a HiTrap Q column (GE Healthcare) in 50 mMThs-HCI pH 7.4, in a gradient of 0.15 to 2 M NaCl. Finally, the proteins were desalted on 5 ml HiTrap Desalting columns (GE Healthcare).
- Polyacrylamide gel electrophoresis was performed at 8% under denaturing conditions. After separation, proteins were transferred by western blot onto a polyvinylidene difluoride membrane. Antithrombin was detected by immunostaining with a polyclonal antibody against human antithrombin made in rabbit (Sigma-Aldrich, Madrid, Spain), followed by donkey anti-rabbit IgG conjugated with horseradish peroxidase (GE Healthcare, Barcelona, Spain), with detection using an ECL kit (Amersham Biosciences, Piscataway, NJ, USA). The secretion rate at 24 hours after transfection relative to the wild type protein was evaluated by densitometry using the ImageJ program.
- the antidote of the invention has the same electrophoretic mobility as the alpha form (since both have 4 N-glycans) and is present in the secreted medium more than the normal alpha and beta forms, specifically 2.7 times more.
- Figure 2 shows the silver staining of the antidote of the invention on a polyacrylamide gel in which electrophoresis with SDS has been performed under reducing conditions, which shows the purity of the recombinant antithrombin (antidote) at different concentrations in micrograms.
- the recombinant antithrombin of the invention (antidote) has a higher affinity for heparin than Beta-antithrombin, which means that it is capable of binding to heparin more efficiently than physiological antithrombin with a higher affinity for heparin.
- none of the recombinant antithrombins described in EP2379101 B1 comprise the mutations of the present invention at positions 1039 and 1044 of the nucleotide chain that translate into the changes in the M315N and V317N amino acids, therefore, the recombinant antithrombin of the invention has a higher affinity for heparin than those described in EP2379101 B1, which translates into greater anticoagulant activity.
- Anti-FXa and anti-FIla activities were assayed by incubating antithrombin with low molecular weight heparin (0.096 nM) or unfractionated heparin (0.03 nM) with FXa (2 pM) or Fila (2 pM), respectively.
- Hydrolysis of chromogenic substrates S-2765 for FXa or S-2238 for Fila
- Blood samples were obtained after administration of the drugs for a period of up to 24 hours.
- the initial concentration of the antidote of the invention is 600 pg/mL, starting from said solution 0, 1, 5, 10, 25, or 50 pL of said solution were administered to 500 pL of serum sample.
- Example 1 Patient anticoagulated with Enoxaparin (60 mg every 12 hours) for a pulmonary thromboembolism, Table 5:
- Example 2 Patient anticoagulated with a type of low molecular weight heparin (Bemiparin) (7500 Ul/day) for atrial fibrillation, Table 6.
- Bemiparin a type of low molecular weight heparin (7500 Ul/day) for atrial fibrillation
- Example 3 Patient anticoagulated with Bemiparin (5000 lll/day) for atrial fibrillation Table 7.
- Example 4 Patient anticoagulated with Bemiparin (5000 lll/day) for atrial fibrillation Table 8.
- mice were C57BL/6J mice.
- the animal experiments were approved by the Animal Experimentation Committee of the University of Murcia and were carried out in accordance with the European guidelines for animal experimentation. To do this, we grouped the mice into 4 groups. Each group contained 5 males and 5 females. Each mouse was first anesthetized with isoflurane administered by inhalation and received an injection of 100 mg/kg of benzyl alcohol. 100 l subcutaneously and 10 minutes later an injection of 100 pl into the retro-orbital sinus. In group 1, both injections contained PBS.
- group 2 we injected subcutaneous low-molecular-weight heparin (Clexane) and PBS into the retro-orbital sinus.
- group 3 we injected subcutaneous PBS and antidote into the retro-orbital sinus.
- group 4 we injected subcutaneous low-molecular-weight heparin (Clexane) and antidote into the retro-orbital sinus.
- Five minutes after the last injection blood was drawn from the vena cava with syringes containing sodium citrate and then euthanasia was performed.
- Low-molecular-weight heparin (Clexane) was injected at a dose of 3 mg/kg and the antidote at a concentration of 20 mg/kg. Once the blood was extracted, the plasma was isolated by centrifugation at 2300g for 15 minutes and the anti-FXa activity was measured.
- SEQ ID NO: 1 Nucleotide sequence of the gene encoding the SERPINC1 protein in Homo sapiens. This sequence is the region between nucleotide 69 and 1463, CDS (Coding Sequence) of Genebank, NM_000488.4 (1552 bp mRNA linear PRI 10-APR-2023)
- SEQ ID NO: 2 Nucleotide sequence encoding the antidote or recombinant protein of the invention, including, with respect to SEQ ID NO: 1, the mutations 504TCC>NNN, 1039TG>AC and 1044GTG>ACA and the deletion of 1272CGT
- SEQ ID NO: 3 Nucleotide sequence encoding the antidote or recombinant protein of the invention, including, with respect to SEQ ID NO: 1, the mutations 504T>G, 1039TG>AC and 1044GTG>ACA and the deletion of 1272CGT
- SEQ ID NO: 4 Amino acid sequence of SERPINC1 , see also GenPept NP_000479; 464 aa; linear PRI 10-APR-2023
- SEQ ID NO: 6 Amino acid sequence of the recombinant antithrombin of the invention with all mutations with the signal peptide: S169A/M347N/V349T/AR425
- SEQ ID NO: 7 Amino acid sequence of the recombinant antithrombin of the invention with all mutations without the signal peptide S137A/M315N/V317T/AR393 SEQ ID NO: 8-15 primers used
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Abstract
Description
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24822887.6A EP4729066A1 (en) | 2023-06-15 | 2024-06-14 | Antidote |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ES202330502A ES2992695B2 (es) | 2023-06-15 | 2023-06-15 | Antidoto |
| ESP202330502 | 2023-06-15 |
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| WO2024256742A1 true WO2024256742A1 (es) | 2024-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2024/070374 Ceased WO2024256742A1 (es) | 2023-06-15 | 2024-06-14 | Antídoto |
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| Country | Link |
|---|---|
| EP (1) | EP4729066A1 (es) |
| ES (1) | ES2992695B2 (es) |
| WO (1) | WO2024256742A1 (es) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000069256A1 (en) * | 1999-05-13 | 2000-11-23 | Genzyme Transgenics Corp. | Transgenically produced antithrombin iii and mutants thereof |
| WO2009013251A1 (en) * | 2007-07-20 | 2009-01-29 | Universite Paris-Sud Xi | Use of mutated antithrombins for treating or preventing coagulation disorders |
| WO2010081878A1 (en) * | 2009-01-16 | 2010-07-22 | Universite Paris-Sud Xi | Mutated antithrombins, a process for preparing the same and their use as drugs |
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2023
- 2023-06-15 ES ES202330502A patent/ES2992695B2/es active Active
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2024
- 2024-06-14 EP EP24822887.6A patent/EP4729066A1/en active Pending
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|---|---|---|---|---|
| WO2000069256A1 (en) * | 1999-05-13 | 2000-11-23 | Genzyme Transgenics Corp. | Transgenically produced antithrombin iii and mutants thereof |
| WO2009013251A1 (en) * | 2007-07-20 | 2009-01-29 | Universite Paris-Sud Xi | Use of mutated antithrombins for treating or preventing coagulation disorders |
| EP2175877B1 (en) | 2007-07-20 | 2012-01-04 | Université Paris-Sud XI | Use of mutated antithrombins for treating or preventing coagulation disorders |
| WO2010081878A1 (en) * | 2009-01-16 | 2010-07-22 | Universite Paris-Sud Xi | Mutated antithrombins, a process for preparing the same and their use as drugs |
| EP2379101B1 (en) | 2009-01-16 | 2018-09-12 | Université Paris-Sud XI | Mutated antithrombins, a process for preparing the same and their use as drugs |
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| "Genebank", Database accession no. NM_000488.4 |
| ÁGUILA SONIA, NOTO ROSINA, LUENGO-GIL GINÉS, ESPÍN SALVADOR, BOHDAN NATALIYA, DE LA MORENA-BARRIO MARÍA EUGENIA, PEÑAS JULIA, RODE: "N-Glycosylation as a Tool to Study Antithrombin Secretion, Conformation, and Function", INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES, MOLECULAR DIVERSITY PRESERVATION INTERNATIONAL (MDPI), BASEL, CH, vol. 22, no. 2, Basel, CH , pages 516, XP093256407, ISSN: 1422-0067, DOI: 10.3390/ijms22020516 * |
| BIANCHINI EPFAZAVANA JPICARD VBORGEL D: "Development of a recombinant antithrombin variant as a potent antidote to fondaparinux and other heparin derivatives", BLOOD, vol. 117, no. 6, 2011, pages 2054 - 60 |
| LANGDOWN JBELZAR KJSAVORY WJBAGLIN TPHUNTINGTON JA: "The critical role of hinge-region expulsion in the induced-fit heparin binding mechanism of antithrombin", J.MOL.BIOL., vol. 386, 2009, pages 1278 - 1289 |
| MARTÍNEZ-MARTÍNEZ IRENE, NAVARRO-FERNÁNDEZ JOSÉ, ÁGUILA SONIA, MIÑANO ANTONIA, BOHDAN NATALIYA, DE LA MORENA-BARRIO MARÍA EUGENIA,: "The Infective Polymerization of Conformationally Unstable Antithrombin Mutants May Play a Role in the Clinical Severity of Antithrombin Deficiency", MOLECULAR MEDICINE, FEINSTEIN INSTITUTE FOR MEDICAL RESEARCH, WASHINGTON , DC, vol. 18, no. 5, 1 May 2012 (2012-05-01), Washington , DC , pages 762 - 770, XP093256410, ISSN: 1076-1551, DOI: 10.2119/molmed.2012.00017 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ES2992695A1 (es) | 2024-12-17 |
| ES2992695B2 (es) | 2025-07-23 |
| EP4729066A1 (en) | 2026-04-22 |
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