78 results about "Antithrombin" patented technology

The invention relates to the inhibition of blood coagulation, especially during organ rejection, and in particular the inhibition of delayed vascular rejection. The invention provides anticoagulant proteins which are anchored to cell membranes. The anticoagulant function preferably provided by heparin, antithrombin, hirudin, TFPI, tick anticoagulant peptide, or a snake venom factor. These anticoagulant proteins are preferably prevented from being constitutively expressed at the cell surface. In particular, expression at the cell surface is regulated according to cell activation, for instance by targeting the protein to a suitable secretory granule. Expression of these proteins renders cells, tissues and organs less vulnerable to rejection after transplantation (e.g. after xenotransplantation).

Heparin-binding regions of several proteins, such as neural cell adhesion molecule, fibronectin, laminin, midkine, and anti-thrombin III have been shown to promote neurite extension on two-dimensional surfaces. The effect of heparin-binding peptides on neurite extension through three-dimensional matrices was investigated by culturing embryonic chick dorsal root ganglia (DRG) within fibrin gels containing chemically attached heparin-binding peptide (HBP). The length of neurites within fibrin gels containing cross-linked HBP was increased by more than 70% over extension through fibrin gels containing no peptide. The HBP sequence of antithrombin III was incorporated into the fibrin gel as the C-terminal domain of a bidomian, chimeric peptide; the N-terminal second domain of this peptide contained the ∀2-plasmin inhibitor substrate for Factor XIIIa. Factor XIIIa, a transglutaminase, was used to chemically attach the HBP-containing chimeric peptide to the fibrin gels during polymerization. The amount of HBP cross-linked into the fibrin gels was determined, after degradation by plasmin using gel permeation chromatography, to be approximately 8 moles of peptide per mole fibrinogen. A peptide (HBP), where the cross-linking glutamine was replaced with glycine, showed no increase in extension in comparison with fibrin gels. The additional of heparin to the gel percursors resulted in no increase in neurite extension in comparison with fibrin gels. HBPs promote neurite extension by binding to cell surface proteoglycans on the DRG.

The invention relates to novel degradation resistant FGF-1, and methods for producing and using the same. More specifically, the invention relates to identification of a thrombin degradation resistant FGF-1, an a nucleic acid encoding the same. The thrombin degradation resistant FGF-1 can elicit responses that are otherwise typically impeded by degradation of FGF-1 by thrombin. Thrombin degradation resistant FGF-1 is an important molecule for effecting an FGF-1 response that would be otherwise inhibited by thrombin. Thus, the present invention provides a powerful therapeutic for diseases or disorders wherein an FGF-1 response can mediate a reduction in the frequency or intensity of a symptom of the disease or disorder but for degradation of FGF-1 before it can effect the response.

The invention is for the combination of EDTA, cystine, selenium, Vitamin C, Vitamin E, and zinc for anti-thrombotic effect and for the effect of restoring platelet aggregation, an integral component of thrombus formation, to normal and for the monitoring of the response to therapy with the combination. Methods for use of the components and method for performing the monitoring are included. The combination and method are particularly efficacious for vascular deficiency ailments including atherosclerotic vascular disease, reduction of ischemic cerebal event, complications from surgical procedures including restenosis, neurogenerative disease, and erectile disfunction, and vascular deficiency resulting from etiology of sepsis and chronic infection.

The invention features methods of treating a subject having a lung disorder such as lung inflammation and injury, by administering antithrombin III through pulmonary delivery.

Glycosaminoglycans derived from K5 polysaccharide having high anticoagulant and antithrombotic activity and useful for the control of coagulation and as antithrombotic agents are obtained starting from an optionally purified K5 polysaccharide by a process comprising the steps of N-deacetylation/N-sulfation, C5 epimerization, O-oversulfation, selective O-desulfation, 6-O-sulfation, N-sulfation, and optional depolymerization, in which said epimerization is performed with the use of the enzyme glucoronosyl C5 epimerase in solution or in immobilized form in the presence of divalent cations. New, particularly interesting antithrombin compounds are obtained by controlling the reaction time in the selective O-desulfation step and submitting the product obtained at the end of the final N-sulfation step to depolymerization.

The use of antithrombin to improve the therapeutic efficacy of cell and organ transplantation.

The invention discloses a determination method for heparin activity. The method comprises three steps of treatment of standard substances and samples, establishment of a standard curve and sample measurement, and calculation of heparin activity contents in the samples, wherein reaction systems and time are as follows: (1) 10-40 microliters standard curve establishment solution and samples with 0-0.1 IU/ml heparin activity concentration are mixed with 10-40 microliters antithrombase with 1 IU/ml concentration, and are incubated for 3 minutes at the temperature of 37 DEG C; (2) 10-40 microliters activated bovine blood coagulation factor X with 10 nkat/ml concentration is added for mixing, and is incubated for 1.5 minutes at the temperature of 37 DEG C; (3) 10-40 ml color development substrate S-2765 with 2.5 mmol/L concentration is added for mixing, and is incubated for 3 minutes at the temperature of 37 DEG C; and (4) 10-40 microliters acetic acid with 50% of volume concentration is added for evenly mixing, and then the reaction is stopped. The method has the advantages of lower reagent dosage, high detection efficiency and high precision of measurement results, and is more suitable for detecting the samples with lower heparin activity.

ATIII is a serine proteinase inhibitor (serpin) with anti-coagulant, anti-inflammatory, anti-proliferative and anti-angiogenic properties. The invention features methods of treating a subject having lung injury due to burns and smoke inhalation by administering a synergistic combination of antithrombin III and heparin through pulmonary delivery means.

The present invention provides for the production of recombinant human antithrombin (rhAT) for the treatment or prophylaxis of neurocognitive disorders typically associated with major surgical procedures. The recombinant processes of the current invention as well as more efficient methods of treatment, formulation and production have been developed to treat the incidence of neurocognitive problems associated with visuoconstruction, parieto-occipital watershed area injury, hypoperfusion, microemboli or other larger embolic factors and/or CABG procedures secondary to surgery.

The invention relates to a method for preparing a human antithrombin-III product, which comprises the following steps of: separating a component IV in a plasma protein process by using a Cohn low-temperature ethanol method, precipitating the component IV serving as a raw material; and finally, preparing the high-purity antithrombin-III lyophilized product through extracting, filter pressing, carrying out heparin affinity chromatography, ultra-filtering, degerming, filtering, lyophilizing and the like and a necessary S/D and dry heat virus inactivating process. According to the invention, the process is adjusted, so that AT-III is dissolved as much as possible; the Pasteur virus inactivating process is replaced by the S/D virus inactivating process by adding proper protective agent; activity loss is reduced; the preparation time is shortened; furthermore, high-purity AT-III solution can be obtained only in the need of heparin affinity chromatography for one step; after carrying out the steps of ultra-filtering, freezing, drying, inactivating dry heat virus and the like, the purity of a final product is above 95%; and the specific activity is above 6.5 IU/mg and is 3.0 IU/mg more than specified limits in the European pharmacopoeia and united state pharmacopoeia.

The invention discloses a method for preparing oxidized low-molecular-weight heparin-antithrombin compounds and applying the oxidized low-molecular-weight heparin-antithrombin compounds to coating layer used for improving extracorporeal circulation pipeline blood and biocompatibility. The method comprises the following steps: firstly, oxidizing low-molecular-weight heparin through sodium periodate; then, carrying out nonenzymatic glycosylation reaction with antithrombin; obtaining the purified oxidized low-molecular-weight heparin-antithrombin compounds through centrifugal ultrafiltration and diethylaminoethyl-agarose high-flowing-speed anion exchange chromatography; and then, using the polymine-glutaric dialdehyde combining technology for immobilizing the low-molecular-weight heparin-antithrombin compounds on the surface of the extracorporeal circulation pipeline. The extracorporeal circulation pipeline of the oxidized low-molecular-weight heparin-antithrombin compound coating layer prepared by the invention has better coating layer stability, anticoagulation performance and biocompatibility than the extracorporeal circulation pipeline of the heparin coating layer and low-molecular-weight heparin coating layer, the inflammatory mediator generation and release and the blood coagulation system activation caused by the contact of blood with the surface of the extracorporeal circulation pipeline can be lightened.

The process of preparing recombinant human antithrombase III protein with mammary gland bioreactor includes the following steps: selecting mammalian lactoprotein gene as the control region and expression frame of the transgene, establishing unique cleavage site on the frame, connecting human AT-III protein gene function part, lactoprotein secretion sequence and enterokinase protein cleaving sequence gene to the expression frame, and connecting one screening gene to the end of the vector; transferring the expression vector to in vitro cultured animal somatic cell to obtain cell strain containing human AT-III protein gene; transferring the transgenic cell strain to mature denucleated oocyte of goat to fuse the nucleus donor cell and the denucleated oocyte; transferring the cloned embryo to yow oviduct to obtain transgenic goat; detecting transgenic milk and purifying; animal experiment and human body experiment; and applying recombinant AT-III protein in human body.

The invention relates to a protein marker for myocardial infarction in urine and applications thereof in diagnosis and prognosis, and particularly, relates to applications of identification reagents of following proteins, including antithrombin-III, complement-C3, [alpha]-1-acid glycoprotein 1, serum transferrin, cathepsin Z, and a combination thereof, in preparation of reagents for diagnosis and/or prognosis of the myocardial infarction of patients. Herein, the five proteins have excellent clinical application prospects in the fields of diagnosis of myocardial infarction and detection on diseases status and therapy effects.

The invention belongs to the technical field of genetic engineering, relating to a target multifunctional anti-embolism fusion protein an amino acid sequence of which is as shown in SEQ ID NO.1. The invention also relates to a gene for encoding the fusion protein, a recombinant expression vector containing the gene, a transformant containing the recombinant expression vector and a method for preparing the fusion protein. The fusion protein can reasonably splice human antibacterial peptide LL-37, leech peptide Hirudin-12, Agkistrodon acutus peptide (AAP), arginine-glycin-aspartate (RGD) and human blood coagulation factor Xa identification sites, so that the functions among a target component, an antibacterial component, a thrombin resisting component and a platelet aggregation resisting component are complementary and in synergistic effect; and the fusion protein can well exert target anti-inflammatory and anticoagulation activities at a thrombus position, and simultaneously can repair a vessel endothelial cell, can commonly inhibit the formation and development of thrombus by virtue of multiple ways, and can be used for preparing a medicament for preventing and treating thrombotic diseases.

The invention discloses a fermentation expression method of a human anti-thrombin III, a special expression vector and an engineered strain thereof. The Pichia pastoris expression vector for expressing the human anti-thrombin III is the recombinant Pichia pastoris expression vector containing human anti-thrombin III code gene. The Pichia pastoris engineered strain for expressing the human anti-thrombin III is obtained by introducing the recombinant Pichia pastoris expression vector containing the human anti-thrombin III into Pichia pastoris. The use of the Pichia pastoris expression vector and the engineered strain for carrying out the expression of the human anti-thrombin III can make up for the deficiencies of the traditional preparation method of the human anti-thrombin III and the expression mode of a prokaryotic expression system; in addition, if the invention is applied to the industrial production of the human anti-thrombin III, the advantages of simple operation, short growth cycle of raw material organisms, large production scale (high-density fermentation), low extraction cost and high enzyme activity are significant, thereby having important industrial application prospect and practical significance.

The invention discloses raising bait for sucking-blood leeches as well as a preparation method and application of the raising bait. The raising bait is prepared by mixing vegetable juice with animal serum in the volume ratio of the vegetable juice to the animal serum being (1-5) to (6-10). The preparation method comprises the following steps of (1) taking animal blood clods, stirring and breaking the taken animal blood clods, and performing filtration with a 40-mesh sieve so as to obtain filtrate namely the animal serum; (2) thoroughly cleaning vegetables, draining the cleaned vegetables, chopping the drained vegetables to obtain vegetable segments of 3-5 cm, mashing the vegetable segments, and performing filtration with a 40-mesh sieve so as to remove fibers and obtain filtrate namely the vegetable juice; and (3) mixing the animal serum with the vegetable juice in proportion. The raising feed for sucking-blood leeches provided by the invention is prepared by mixing the vegetable juice with the animal serum, so that the content of antithrombins and the individual weight of the leeches in unit mass can be greatly increased, and besides, the nutrient structure of the bait for the leeches is enriched; the raising efficiency is improved, and the medical value of the leeches is notably increased, so that the artificial raising economic benefits of the leeches are improved. The preparation method is simple, the raw materials are easy to obtain, and the vegetable juice and the animal serum are mixed and used, so that the supply pressure of the animal blood in the market can be relieved.

The invention discloses a heparin sodium purification method. The method comprises steps as follows: covalently bound agarose gel-antithrombin III is taken as a chromatography medium, coarse heparin is dissolved by an equilibrium liquid, and circulating adsorption is performed for 3 times through the affinity chromatography medium slowly; after the adsorption is finished, 2-3 column volumes of cleaning solution are adopted for washing; 2 column volumes of eluent are utilized to clean down heparin; an extracting solution ethyl alcohol is added finally, and stirring, precipitating, dehydrating, filtering and drying are performed to obtain high-purity heparin sodium with the titer higher than 180 Uusp/mg. The content of related substances such as dermatan sulfate, chondroitin sulfate and the like is reduced to meet the requirement of pharmacopeia through further purification of coarse heparin, the production efficiency is greatly improved, and the regenerated agarose gel-antithrombin III chromatography medium can be recycled.