70 results about "Recombinant Interleukin" patented technology

A method and composition for treatment of advanced cutaneous T cell lymphoma is provided which involves administration of recombinant interleukin-12.

The invention relates to a coupling compound formed by the recombinant human interleukin-2 connecting with the monomethyl polyethylene glycol through the amino acid or the oligopeptide; the coupling compound has rather good plasma stability, and can release and recompose the recombinant human interleukin slowly to actively play the pharmacological action.

The invention discloses a Pichia pastoris transformant capable of expressing human recombinant interleukin-3 (rhIL-3) with high efficiency and a purification method thereof. In the method, the eukaryotic host is pichia pastorisX-33. The purification method comprises the following steps: cloning a human IL-3 gene; establishing a eukaryotic expression vector, and transforming the eukaryotic expression vector into the eukaryotic yeast host; obtaining a yeast transformant for high-level secretory expression by screening, wherein the IL-3 expressed by the yeasts are available in a glycosylated mode and a non-glycosylated module; and performing amplified culture by using a shake flask, and subjecting the supernate of the culture solution to dialysis, nickel affinity purification and further purification by diethylaminoethanol (DEAE) anion column. The purified product is subjected to mass spectrometric identification and analysis, and the result of the mass spectometric identification and analysis indicates that the expressed IL-3 is modified by different glycosyls and that the IL-3 has an his*6 tag and a C-MYC tag and is easy for purification and detection of expression product. In the invention, different from the conventional method using a prokaryotic host to express the rhIL-3, the method for expressing a large amount of rhIL-3 by using a Pichia pastoris expression system is adopted for the first time, quick purification is realized by using a His-tag protein, the purified rhIL-3 is high-activity rhIL-3 protein which is glycosylated to different extents and of which the molecular weight is 19kDa and 22kDa. The method ensures that the high-activity rhIL-3 recombinant protein is obtained quickly.

The invention provides a construction and an application of recombinant human interleukin 12 eukaryotic expression vector and relates to the development of recombinant human interleukin 12 (rhIL-12) eukaryotic expression vector, the screening of stable expression cell lines and the adjuvant function of nucleic acid vaccine gene and the therapeutical effect of tumor gene. Ten hydrophobic flexible amino acid joints are used to connect P40 and P35 to obtain fusion gene to construct rhIL-12 eukaryotic expression plasmid (pCDNA6-IL-12), then the expression plasmid is transferred to CHO cell and finally stable expression cell lines are screened. The expression product has good biological activity. Nucleic acid vaccine and pCDNA6-IL-12 are used for coimmune so as to significantly increase the immune effect. Strong antitumor effect can be exerted when the expression vector of the invention is directly injected inside the tumor of laboratory mouse tumor model or is first used to perform gene modification to tumor cells and then implanted in tumor. The expression vector of the invention can be used in the search of clinical trial stage after further perfecting.

The invention provides a preparation method for poly(ethylene glycol) modified recombinant human interleukin-2, belonging to the field of biological medicine. The method comprises the following steps: activating mPEG with an activator so as to obtain an activated mPEG molecule; and reacting the activated mPEG molecule with recombinant human interleukin-2, adding a glycine solution to terminate a reaction and separating and purifying an obtained product; wherein the activator is one selected from the group consisting of succinic anhydride and N-hydroxysuccinimide, p-toluenesulfonic acid-chlorine, N,N'-carbonyl diimidazole, N,N'-disuccinimidocarbonate, p-nitrophenyl carbonate, benzotriazole carbonate, phenylsuccinimide carbonate and N-acetoxysuccinimide. The preparation method provided by the invention is simple and convenient to operate and is easy for quality control and enlarged production.

The invention discloses a method for detecting the activity of the recombinant human interleukin 12 (rhIL-12) protein, comprising the following steps: (1) stimulating the natural killer cell (NKC) which have the collection number of 2901 in the China General Microbiological Culture Collection Center (CGMCC) to genera Gamma interferon by using the standard rhIL-12 protein of different concentration and detecting the amount of the Gamma interferon to obtain a standard curve; (2) doing the experiment with the rhIL-12 protein to be detected in the activity by using the same method adopted in the step (1) so as to obtain the concentration of the rhIL-12 protein to be detected in the activity, which corresponds to half of the maximum amount of the Gamma interferon; and (3) calculating the activity of the rhIL-12 protein. The method for detecting the activity of the rhIL-12 protein can be operated easily, rapidly and stably and has low cost and high stability, repeatability, sensitivity and specificity, thereby having broad application prospect in the field of the detection of the activity of the rhIL-12 protein and laying a good foundation for the clinical use and the medicinal detection of the rhIL-12 protein.

The invention provides a culture method for monkshood polysaccharide-induced nature killer T cell (Nature Killer T cell, NKT) proliferation. The method comprises the characteristics as follows: human peripheral blood, marrow or a mononuclear cell with an umbilical cord blood source are continuously cultivated by traditional Chinese medicine monkshood polysaccharide and recombinant human interleukin 2, a lot of nature kill T cells are obtained, NK<1.1+> and CD<8+> are expressed, interferon gamma is secreted, the ratio in lymphocyte at the 14th day is more than 16.15%, the order of magnitude can be up to over 5*10<9>, and the nature kill T cell have effective anti-tumor and anti-virus functions. A clinical application of the NKT cell obtained by the method is also provided by the invention.

The invention relates to a fusion protein of human serum albumin (especially wild-type human serum albumin) and human interleukin-2 (especially mutant human interleukin-2). The fusion protein has a significantly prolonged in vivo half-life relative to recombinant interleukin-2, so that the fusion protein can be used alone for the treatment of tumors. Moreover, the fusion protein can significantly improve the anti-tumor efficacy of an anti-PD-1 antibody or an anti-PD-L1 antibody.

The invention relates to a purification method for recombinant human interleukin-12. The method includes the steps that cell culture fluid containing recombinant human interleukin-12 is clarified and filtered through a deep filtering system; 2, Q Sepharose HP purification is conducted; 3, Phenyl Sepharose 6FF Highsub purification is conducted; 4, SP Sepharose HP purification is conducted; 5, Superdex 200 purification is conducted. The method has the advantages of being simple in process, good in stability, uniform in product, low in production cost, environmentally friendly and high in activity and is suitable for industrial production.

The invention provides a method for preparing recombinant human interleukin-11 (rhIL). The method comprises the following steps: 1) providing a fusion protein, wherein from the N-end to the C-end, the fusion protein is thioredoxin-(His)6-proteolytic enzyme recognition site-rhIL-11 or (His)6-thioredoxin-proteolytic enzyme recognition site-rhIL-11; 2) using the proteolytic enzyme to perform enzyme cutting to the fusion protein and obtain an enzyme cutting product, wherein the enzyme cutting product contains thioredoxin and rhIL-11; and 3) using the nickel ion chelate affinity column chromatography to purify the enzyme cutting product, and performing gradient elution to the column to obtain rhIL-11, wherein the thioredoxin and the rhIL-11 are both adsorbed on the column. By adopting the method provided by the invention, the rhIL-11 can be purified rapidly, conveniently and efficiently and the recovery rate can be greatly increased.

The invention provides a recombinant porcine interleukin 4, and an encoding gene, an expression method, a purification method and an inclusion body renaturation method of the recombinant porcine interleukin 4, and belongs to the field of biological genetic engineering. The interleukin 4 plays an important part in immune regulation in a consequence of disease, thereby being widely used in animal disease treatments. In order to obtain a large amount of porcine interleukin 4, the escherichia coli expression system is used for performing heterologous expression to the recombinant porcine interleukin 4 gene of which the codon is optimized. In addition, because the porcine interleukin 4 in a prokaryotic expression is mostly expressed in form of inclusion body, the invention also provides an inclusion body purification method of the recombinant interleukin 4 and screens the inclusion body renaturation method. Finally, the activity of the recombinant interleukin 4 obtained according to the invention is 5*10<5>IU/ml to 2*10<6> IU/ml and is 2 folds of the activity of the internationally recognized porcine interleukin 4 standard, thus the standard of industrial production is completely achieved.

The invention belongs to the technical field of molecular immunology, and in particular relates to a preparation method and an application of recombinant canine interleukin-2. The preparation method comprises the following steps: amplifying mature protein genes of the canine interleukin-2 from canine peripheral blood lymphocytes via a PCR method and connecting the genes onto a pichia pastoris expression vector pPICZaA so as to construct a recombinant vector of the mature protein genes of the recombinant canine interleukin-2; integrating the recombinant vector into a specific position in pichia pastoris in an electrical transformation manner. Thus, the high-efficiency expression of the canine interleukin-2 in the pichia pastoris is realized, and the expressed recombinant protein is good in biological activity. The method is low in production cost and high in production efficiency, and the recombinant canine interleukin-2 is good in biological activity. Thus, the method is suitable for enterprise production.

The invention provides a method for in vitro amplification of human gamma delta T cells and application thereof. The method for in vitro amplification of human gamma delta T cells includes the steps of: (1) preparing or providing mononuclear cell; (2) adding the mononuclear cell into a cell culture liquid, and placing the cell culture liquid into a cell incubator to conduct culture; and (3) acquiring the cells. The cell culture liquid contains (1-hydroxy-3-(methyl pentyl amino)propylidene)diphosphonic acid monosodium salt (IBA) and human recombinant interleukin rhIL-2. According to the invention, the method of combining rhIL-2 and IBA to stimulate human peripheral blood mononuclear cells (PBMC) is employed to amplify human gamma delta T cells in vitro. The method has the characteristics of low cost, simple preparation and high amplification efficiency, and can obtain gamma delta T cells with strong tumor lethality and TCR (T cell receptor) cloning diversity.

The invention discloses a vagina injection agent for treating uterine prolapse. The vagina injection agent is prepared from the following components in parts by weight: 5-20 parts of beta-glucan, 1-10parts of lycium barbarum polysaccharide, 1-10 parts of chitosan oligosaccharide, 5-15 parts of recombinant human serum albumin, 0.05-0.5 part of recombinant human interleukin-22, 0.1-0.6 part of recombinant human interleukin-4, 0.3-1.5 parts of a recombinant human epidermal growth factor, 10-15 parts of active lactobacillus powder, 0.1-1 part of a penetration enhancer, 1-5 parts of a bio-adhesiveagent, 40-60 parts of a buffer solution and 50-100 parts of normal saline. The vagina injection agent directly acts on lesion parts, local drug concentration is high, the vagina micro-environment canbe effectively improved, the micro-ecological balance in a vagina and the normal micro-environment of a cervix are maintained, and local and body immune functions are improved; and the vagina injection agent can further promote cell regeneration, promote collagen synthesis, improve skin elasticity, accelerate repair of damaged tissue, promote tension recovery of pelvic floor muscles, fascia and uterus ligament, and can effectively improve uterine prolapse; and recurring is not prone to appearing after cure, using is convenient and safe, and the effect is fast.

The present invention relates to an interleukin-2 expression construct for yeast, comprising a methanol oxidase (MOX) promoter; a human serum albumin gene or a fragment thereof; and an interleukin-2 (IL-2) gene, and to a yeast comprising the expression construct. The interleukin-2 expression construct for yeast according to the present invention makes it possible to produce an expressed and secreted fusion protein of human serum albumin (HSA) and interleukin-2 at low costs and easily separate recombinant interleukin-2 from the fusion protein. Thus, the interleukin-2 expression construct for yeast may be effectively used to produce a large amount of recombinant interleukin-2 with high purity.

The invention discloses a recombinant human interleukin (IL) 15 long peptide fragment and a production method thereof. The production method comprises the following steps: obtaining a human IL-15 long peptide fragment gene; establishing an eukaryotic expression vector and transforming the vector into Pichia pastoris X-33; performing resistance screening on high-level secretory-expressed yeast transformants; performing induced expression, purifying the supernate through a nickel column and an ion exchange column to obtain rhIL-15L. The production method is characterized in that the amino acid residue Ala of the site Kex2P1' of the vector pPICZAlphaA is mutated into Pro and the Pichia pastoris X-33 is taken as host bacteria, and therefore, mass high-efficiency stable expression of the rhIL-15L is realized; the recombinant protein rhIL-15L produced by the method is marked with HIS and C-MYC tags and prone to protein purification and detection; besides, the recombinant protein rhIL-15L is a glycoprotein which is modified through glycosylation to a certain extent, and therefore, the recombinant protein rhIL-15L has excellent bioactivity and is capable of effectively maintaining the proliferation and the bioactivity of human NK (Natural killer) cells in vitro and of a mouse in vivo.

The invention relates to a recombinant plasmid DNA vaccine composition for treating Hepatitis B. The composition contains a recombinant vaccine plasmid which simultaneously carries Hepatitis B middle protein S2S coding gene and Hepatitis B Core protein coding gene as well as a recombinant adjuvant plasmid, wherein the adjuvant plasmid is the adjuvant plasmid of recombinant interleukin 2 or recombinant human interferon gamma.

The invention discloses a method for improving the yield of recombinant human interleukin-2 (rhIL-2). The method comprises the steps of purification, eluent recovery after the purification, reductionof rhIL-2 dimer and wrong ligand by using 2-mercaptoethanol, reoxidation renaturation, and purification. The method performs reduction of rhIL-2 dimer and wrong ligand by using the 2-mercaptoethanol,opens disulfide bonds, and performs reoxidation renaturation and purification, so that correctly-paired disulfide bonds with biological activity can be formed so as to obtain the rhIL-2 with the biological activity, and the yield is improved by about 20 percent.

The present invention provides the coding sequence of recombinant human interleukin-15 (IL-15), the method of constituting engineering cell for high expressing recombinant human IL-15 protein, and the constitution of corresponding expression vector. Through optimizing human IL-15 gene and constituting to proper expression vector, the IL-15 is suitable for secreting expression in colibacillus. Through screening, high expressing recombinant human IL-15 engineering cell is obtained.

The invention provides a method for fermentative production of recombinant human interleukin-12, and belongs to the field of biological product production processes. The method comprises: 1) resuscitating and activating Chinese hamster ovary cells (CHO) containing a recombinant human interleukin-12 expression gene by using a serum-free culture medium, and carrying out enlarging culture to obtain seed cells; 2) after the seed cells normally grow, carrying out adaptive enlarging culture on the seed cells; 3) inoculating the obtained seed cells into a bioreactor, and culturing; 4) periodically adding a serum-free supplemented culture medium and glutamine during the culturing, and monitoring cell growth; and 5) terminating the culturing and harvesting the cells when the cell viability is lessthan 80%. With the method of the present invention, a large amount of the recombinant human interleukin-12 can be expressed, and the downstream purification is easily performed.