33 results about "Pro-urokinase" patented technology

The invention discloses a method for manufacturing an adjustable liver injury animal model and special carriers thereof. The invention provides two special carriers; one is obtained by inserting DNA fragments formed by sequentially connecting tetracycline reacting factors, promoters and pro-urokinase activator coding genes of a Tet-off / Tet-on gene expression system from the upper stream to the lower stream into the multiple cloning sites of an eukaryotic expression carrier; and the other one is obtained by inserting DNA fragments formed by sequentially connecting liver special promoters and antisense tetracycline activator coding genes of a Tet-on gene expression system from the upper stream to the lower stream into the multiple cloning sites of an eukaryotic expression carrier. The two special carriers re implanted into the animal bodies for obtaining a double-positive transgenic animal model, and the expression time and the expression quantity of uPA genes in the liver cells of the animal model are adjusted through the induction of doxycline, thereby the time and the degree of the liver injury can be manually controlled according to demands.

The invention discloses an effect vector of uPA expression regulated by a Tet-on system. The nucleotide sequence of the effect vector comprises a bacteria tetracycline drug-resistant operon sequence, an immediate early promoter sequence of macrophages, a mice pro-urokinase activator expression cassette sequence and a sequence behind the last exon of the mice pro-urokinase activator expression cassette, the four sequences are serially connected in turn. The invention establishes a transgenic mice model of uPA expression regulated by the Tet-on system or tetracycline derivative inducible expression system, and lays solid foundation for further establishing a transgenic animal model of tissue specificity regulatable expression uPA for uPA function research in specific tissues.

The invention discloses a targeting vector and nucleic acid composition for constructing a liver injury mouse model, and a construction method, and relates to the technical field of genetic engineering and genetic modification. The targeting vector disclosed by the invention comprises a first expression cassette and a second expression cassette positioned at the downstream of the first expressioncassette; the first expression cassette comprises the following sequential series components: a liver-specific promoter, a tetracycline transcriptional activation regulating factor and a first polyA;and the second expression cassette comprises the following sequential series components: a second polyA, a mouse prourokinase activator coding gene, and a tetracycline-induced promoter. The liver injury mouse model constructed by the targeting vector has henotype of spontaneous liver injury and induction aggravated liver injury; the mouse death rate of the filial generation thereof is low; large-scale breeding can be conveniently carried out; and the invention provides the reliable liver injury mouse model for researching liver diseases.

The invention relates to novel regulators of plasminogen activation and their use for regulating cell migration, plasminolysis, angiogenesis, fibrinolysis, for treating cancer and thrombo-embolic diseases such as heart stroke. Furthermore, the present invention relates to novel pharmaceutical compositions form regulating cell migration, plasminolysis, angiogenesis and for treating cancer. In particular, the present invention relates to a method of regulating the activation of plasminogen comprising contacting a solution of pro-urokinase (uPA) or tissue plasminogen activator (tPA) and plasminogen with melanotransferrin (p97) for a time sufficient to effect regulation thereof.

Highly efficient methods of producing properly folded recombinant urokinase are provided. Denatured recombinant pro-urokinase is refolded by first solubilizing the protein with a chaotroph at high pH, followed by refolding in the presence of reduced concentrations of chaotroph while the pH is slowly reduced.

The invention relates to novel regulators of plasminogen activation and their use for regulating cell migration, plasminolysis, angiogenesis, fibrinolysis, for treating cancer and thrombo-embolic diseases such as heart stroke. Furthermore, the present invention relates to novel pharmaceutical compositions form regulating cell migration, plasminolysis, angiogenesis and for treating cancer. In particular, the present invention relates to a method of regulating the activation of plasminogen comprising contacting a solution of pro-urokinase (uPA) or tissue plasminogen activator (tPA) and plasminogen with melanotransferrin (p97) for a time sufficient to effect regulation thereof.

An application of gene-recombinant prourokinase in preparing medicines for treating acute myocardial infarction, cerebral infarction, pulmonary embolism, phlebothrombosis of leg, etc is disclosed.

The present invention provides a purification method of recombinant human prourokinase, including protein capture, gel chromatography, cation exchange chromatography, affinity chromatography, anion exchange chromatography, and cation exchange chromatography: the method increases purification steps, Optimize the purification conditions to increase the protein purity to over 98%.

A preparation process for separating and purifying recombinant human pro-urokinase from recombinant Escherichia coli fermentation broth applied in the technical field of biopharmaceuticals, the preparation process comprises the following steps, using the artificially synthesized human pro-urokinase whole gene sequence as a template, by Obtain the target gene fragment of human prourokinase by PCR, construct a prokaryotic expression vector containing human prourokinase, transform the expression vector into Escherichia coli, screen and pick positive clones, which are genetically engineered strains of human prourokinase; The engineered strain of prourokinase was inoculated into solid LB medium, picked a single colony and inoculated into liquid LB medium, cultured on a shaker at 32°C overnight, then inoculated into the fermentation medium in proportion, and cultivated on a shaker at 32°C overnight, Then inoculate into the fermenter according to the proportion, raise the temperature to 42° C. to induce culture for 4 hours, collect the bacteria by centrifugation, disrupt the bacteria by ultrasonic, and collect the precipitate by centrifugation, which is the inclusion body of human prourokinase. The invention is not limited by natural resources, has the advantages of less investment, high output, large profit margin, unique thrombolytic mechanism, obvious effect, and no or low toxicity and side effects.

The invention belongs to the field of pharmacy, more specifically, the invention relates to a medicinal composition containing reactive pro-urokinase, its cryodesiccation method and freeze-dried preparation.

The invention provides a method for removing endotoxin in the process of refining human urokinase raw materials, which relates to the fields of bioengineering and chemical engineering. The method specifically includes the following steps: (1) sample pretreatment; (2) chromatography column preparation and packaging (3) Disinfection and sample loading treatment. The method adopts a new polymer anion chromatographic medium and optimizes various process conditions. The treatment process is simple, the endotoxin in the urokinase intermediate product can be effectively removed, and the urokinase activity yield is guaranteed to be over 75%. In the processing process, man-hours and materials are saved, and production costs are reduced.

The invention discloses a manufacturing method of an adjustable liver damage animal model and a special DNA fragment thereof; a DNA fragment I is formed by sequentially connecting liver super promoters and antisense tetracycline activator coding genes of a Tet-on gene expression system from upstream to downstream; an DNI fragment II is formed by sequentially connecting tetracycline reaction factors, promoters and prourokinase activator coding genes of the Tet-off / Tet-on gene expression system from upstream to downstream; a recombination expression vector carrying the DNI fragment II is used for converting mammalian cells, the cells are cultivated to obtain recombinant adenovirus. The DNA fragment I is led in the animal to obtain a transgenosis first-construction animal; the transgenosis first-construction animal and scid / bg animal are back-crossed to obtain the animal carrying the DNA fragment I with the scid / bg background; the recombinant adenovirus is used for injecting the animal carrying the DNA fragment I with the scid / bg background, so as to obtain the adjustable liver damage animal model; in the model, the prourokinase activator expression is activated by doxycycline, the expression intensity is changed along with the change of dosage, the specificity is very high.

The invention discloses a capillary electrophoresis detection method for analyzing impurities of recombinant human pro-urokinase for injection and application of the capillary electrophoresis detection method. The capillary electrophoresis detection method comprises the following steps: (1) diluting a sample which comprises a non-reducing sample or a reducing sample by using a sample buffer solution, then adding a reducing agent into the reducing sample or adding an alkylating reagent into the non-reducing sample, and mixing; (2) heating a sample obtained by mixing in the step (1), cooling, centrifuging, and transferring into a loading tube; and (3) placing the sample loading tube on a capillary electrophoresis apparatus, operating the capillary electrophoresis apparatus, starting to inject the sample, separating the sample to obtain a capillary electrophoresis detection map, and analyzing the map to obtain a detection result. According to the method, impurities in the recombinant human pro-urokinase can be effectively separated, the reproducibility of multiple batches of samples is good, and the accuracy is high.

The invention discloses a method for enhancingthe sensitivity of tumors to a drug. The method comprises the following step: the sensitivity of human tumor cells to the drug is enhanced by down-regulating expression of a urokinasetype plasrinogen activator receptor (uPAR). The expression of the uPAR is inhibited through RNA interference and antisense nucleic acid, so that the sensitivity of the tumor cells to the drug is enhanced. According to the method, the sensitivity of the tumor cells to drug therapy is enhanced by regulating and controlling ferroptosis through the uPAR. The sensitivity ofthe tumor cells to drug therapy is enhanced by regulating and controlling ferroptosis through the uPAR, and thus the uPAR for regulating and controlling tumor extracellular matrix is linked with ferroptosis.

The invention relates to a pro-urokinase gene mutant and a preparation method thereof. On the premise of keeping the amino acid composition and sequence of a protein unchanged, two nucleotides G and T are added on the 5' end of the gene sequence, and a recognition sequence GTCGAC of endonuclease Sal1 is added on the 3' end of the sequence. The nucleotide sequence of the gene mutant is shown in a sequence table 1. The preparation method comprises the following steps: (1) synthesizing a single-chain nucleotide segment; (2) performing PCR (polymerase chain reaction) to generate a double-chain DNA (deoxyribonucleic acid) segment; (3) splicing the whole sequence of the pro-urokinase gene mutant; and (4) determining and analyzing the sequence of the pro-urokinase gene mutant. Through a method of artificially synthesizing the whole gene, the invention optimizes the whole genetic codon, appropriately modifies both ends of the gene and ensures that sequencing analysis, expression vector construction and other further genetic manipulations can be easily performed. Thus, the invention develops a novel pro-urokinase gene suitable for being expressed in Escherichia coli, so that pro-urokinase can be conveniently produced through an Escherichia coli fermentation technology.

The invention relates to a method for electrophoresis determination of purity of recombinant human prourokinase for injection, wherein the method includes the following steps: (1) preparation of a test sample solution: taking the recombinant human prourokinase for injection on ice, thawing, diluting with MilliQ water, adding a non reductive sample buffer solution, placing at the temperature of 55-65 DEG C and heating for 1-5 minutes, immediately placing in an ice bath to obtain the non reductive test sample solution; (2) preparation of a Marker solution: taking a Marker solution, thawing, placing in an 80-100 DEG C water bath for 1-5 minutes, and immediately placing in an ice bath for standby application; and (3) determination method: adopting a vertical plate gel electrophoresis system, and detecting the test sample solution and the Marker solution, wherein the sample loading amount of the two solutions is 10-20 [mu]L, and the instrument initial voltage is 50-60 V; and adjusting the voltage to 100-110 V when entering a separation gel, when a bromophenol blue band runs to the lower edge of the gel, finishing the electrophoresis, after electrophoresis, dyeing and decoloring to obtain an atlas, and calculating the purity of the test sample solution according to the atlas.