125 results about "Molecular Immunology" patented technology

The invention discloses an anti-PD-1 humanized monoclonal antibody and application thereof, belonging to the technical field of molecular immunology. The anti-PD-1 humanized monoclonal antibody provided by the invention contains a light chain and a heavy chain, wherein the amino acid sequence of the light chain is as shown in SEQ ID NO.2, and the amino acid sequence of the heavy chain is as shown in SEQ ID NO.4 or SEQ ID NO.6. Meanwhile, the invention also provides a nucleotide sequence coding the light chain and heavy chain. The anti-PD-1 humanized monoclonal antibody provided by the invention has very high affinity with human PD-1 protein, and can interdict PD-1/PD-L1 combination so as to promote T cell proliferation and IFN-gamma secretion.

The invention belongs to the field of oncotherapy and molecular immunology, and relates to a PDL-1 antibody, a pharmaceutical composition thereof and application of the PDL-1 antibody, in particular to a monoclonal antibody of PDL-1 or an antigen binding fragment thereof. A variable region of the heavy chain of the monoclonal antibody comprises CDR of which the amino acid sequence is SEQ ID NO: 15-17; and a variable region of the light chain of the monoclonal antibody comprises CDR of which the amino acid sequence is SEQ ID NO: 18-20. The monoclonal antibody can be well combined to PDL-1 specifically, inhibition of PDL-1 to body immunity is relieved specifically, and T lymphocyte is activated.

The invention discloses a VEGF-resistant and PD-1-resistant difunctional antibody and application thereof, belonging to the technical field of molecular immunology. The VEGF-resistant and PD-1-resistant difunctional antibody contains a light chain an a heavy chain, wherein the light chain has an amino acid sequence as shown in SEQ ID NO.2, and the heavy chain has an amino acid sequence as shown in SEQ ID NO.4 or SEQ ID NO.6. Meanwhile, the invention provides a gene for encoding the difunctional antibody and the application of the difunctional antibody. The difunctional antibody provided by the invention can be combined with PD-1 and VEGF, has very high affinity, can be used for effectively simulating T cells to secrete IL2 and induce T cells to secrete IFN-gamma and can also be used for remarkably inhibiting the growth of tumor of a mouse so as to have a huge potential in application to preparation of anti-cancer drugs.

The invention belongs to the field of oncotherapy and molecular immunology, and relates to an anti-PD-L1 antibody as well as a pharmaceutical composition and an application of the anti-PD-L1 antibody. Particularly, the invention relates to a monoclonal antibody or an antigen binding fragment of the monoclonal antibody, wherein a heavy chain variable region of the monoclonal antibody comprises a CDR, the amino acid sequence of the CDR is SEQ ID NO:1-3, and/or a light chain variable region of the monoclonal antibody comprises a CDR, and the amino acid sequence of the CDR is SEQ ID NO:4-6. The monoclonal antibody is specifically bound with PD-L1 well, specifically relieves immunosuppression of PD-1 on the organism, and activates the T iymphocyte.

The present invention belongs to molecular immunology field, mainly relating to chicken infectious bursal disease virus IBDV VP2 polypeptide fragment, more specificly relating to B cell antigen epitope polypeptide fragment in VP2 protein. The present invention also relates to IBDV VP2 protein neutrality and uses of B cell antigen epitope in preparing immunogen, immune animal, immune protection and uses for detecting antibody of resisting chicken infectious bursal disease virus IBDV or polypeptide of chicken infectious bursal disease virus IBDV. Animal is immunized by immunogen or vaccine designed according to B cell antigen epitope which can neutralize chicken IBDV VP2 protein and can produce antibody for neutralizing IBDV in vitro or vivo, so the immunogen can prevent virus infection to animal. Chicken IBDV VP2 protein neutralized B cell antigen epitope vaccine can prevent infection of chicken IBD classic toxic strain, superstrong toxic strain or/ and variant toxic strain.

The present invention relates to molecular immunology technology, and aims at screening out antigen epitope molecular simulation peptide capable of exciting human body's protective immunoreaction against tubercle bacillus, researching protective immunoreaction mechanism against tuberculosis, and further developing new type of concatenate polyepitope tuberculosis vaccine. The present invention provides one kind of antigen epitope molecular simulation peptide capable of exciting human body's protective immunoreaction against tubercle bacillus, and the peptide contains the amino acid sequence selected from SEQ ID Nos. 2, 5, 10, 12, 14 and 15. The present invention also provides the screening process and use of the peptide. The present invention may be used in preventing and controlling tuberculosis.

The invention discloses the sequence of a specific B cell epitope polypeptide of an NS1 protein of encephalitis B virus and the use of the epitope polypeptide in the diagnosis of encephalitis B virus and a screening method of specific B cell epitope polypeptide of NS1 protein of encephalitis B virus, and belongs to the field of molecular immunology. The amino sequence of the epitope polypeptide is represented by SEQ ID No.1 or SEQ ID No.2. The specific B cell epitope synthetic polypeptide of the JEV NS1 protein, the coupling antigen of the synthetic epitope polypeptide and the epitope fusion expression protein can be used for specifically detecting a JEV NS1 protein antibody generated in body which is immunized and infected. The epitope polypeptide can be used for diagnosis of JEV infection, evaluation on immunity effect and identification and diagnosis of immunity of inactivated vaccine and natural infection.

The invention belongs to the cross technical field of molecular immunology and virology, and particularly relates to a hybridoma cell based on hybridoma type leukosis virus subgroup J isolated strain with preservation number of CGMCC (China General Microbiological Culture Collection) No. 5018, a high-specificity monoclonal antibody of avian leukosis virus subgroup J (ALV-J) surface protein (SU) secreted by the hybridoma cell and a preparation method of the monoclonal antibody. By using the high-specificity monoclonal antibody prepared by the invention, a technical support is provided for diagnosis, prevention and treatment of avian leukosis virus subgroup J disease, and the economic loss caused by avian leukosis virus subgroup J disease is effectively reduced.

An anti-infectious immunopotentiator for pig, ox, yak, etc is prepared through artificially synthesizing the CpG oligonucleotide sequce able to excite the reproductive activity of immune cell, preparing the chitosan nanoparticles from deacetyl chitosan, and using said chitosan nanoparticles for molecular packaging of CpG oligonucleotide. It can be used to immunize the experimental animal by intramuscular injection or oral applialtion.

The invention discloses a grass carp reovirus S11 gene eukaryotic expression recombinant plasmid preparation method and application thereof in serving as nucleic acid vaccine, and belongs to the technical field of gene engineering and molecular immunology. The preparation method disclosed by the invention is characterized by comprising the steps of extracting viral genome RNA, performing reverse transcription to convert the viral genome RNA into cDNA, amplifying a corresponding DNA sequence out, constructing the DNA sequence to pcDNA-3.1(+) plasmid, converting Escherichia coli DH5alpha, screening out positive clone bacteria containing recombinant plasmid, culturing a lot of the positive bacteria and extracting recombinant plasmid S11-pcDNA3.1 contained in the bacteria. The recombinant plasmid is utilized as nucleic acid vaccine to perform intramuscular injection on the grass carps, and the nucleic acid vaccine enters the muscle cells and expresses VP35 protein of the grass carp reovirus in the muscle cells; thus, fish body immune cell proliferation is stimulated, antiviral related gene expression is up regulated, fish bodies are stimulated to generate antiviral antibodies, and capability of grass carps in resisting grass carp reovirus infection is effectively improved; furthermore, the grass carp reovirus S11 gene eukaryotic expression recombinant plasmid can be used for preventing a grass carp hemorragic disease caused by the grass carp reovirus in aquaculture.

The invention relates to the molecular immunology field. Although the existing foot-and-mouth disease weak poison vaccines and inactivated vaccines and other routine vaccines have good immunogenicity, but the vaccines have some unsafe factors such as reversion of virulence, incomplete virus blanching, the escape of live-virus from a preparation factory and the like so that people are motivated to find a more safe and effective FMD vaccine. In the molecular mimic peptide invention, phage display techniques are used to sieve effective FMDV epitopes to provide an O-type foot and mouth disease virus antigen epitope molecular mimic peptide and the invention also provides an application thereof in preparing immunogen and swine foot-and-mouth disease epitope peptide vaccine. The FMDV epitope peptide vaccine using the molecular mimic peptide of the invention has the antigenicity of target molecule without toxicity, is very safe and has low mass production cost and good economic effect and social effect.

The invention belongs to the field of molecular immunology, and in particular relates to an exosome secreted and released from the epidermal cells of a chicken liver, gall bladder and bile duct, and a preparation method of the exosome. The exosome contains hepatogenic proteins, such as C-reactive protein, aspartate aminotransferase, and vitronectin, epithelium-derived mucin and proteins related to an immune reaction, such as immunoglobulin, and can be taken as a biological indicator for studying liver diseases and as an adjuvant for immune reaction for immune-regulation, and can also be takenas a carrier for treating the diseases of livers, gall bladders and intestines.

The invention relates to an anti-vascular endothelial growth factor (VEGF) and anti-PD-1 bispecific antibody with a novel structure, and belongs to the technical field of molecular immunology. In a heavy-chain variable region of the antibody, CDR-H1 is an amino acid sequence shown as SEQ ID NO: 1, CDR-H2 is an amino acid sequence shown as SEQ ID NO: 2, and CDR-H3 is an amino acid sequence shown asSEQ ID NO: 3; and in a light-chain variable region of the antibody, CDR-L is an amino acid sequence shown as SEQ ID NO: 4. The bispecific antibody Ps3Vm can be effectively combined with PD-1 proteinand VEGF protein, can effectively compete with PDL-1 to be combined with PD-1 protein and compete with VEGF-A to be combined with VEGF protein, and can effectively stimulate T cell function and secrete cytokines IL-2 and IFN-gamma at the same time. An isotype control antibody cannot promote T cell proliferation and IL-2 and IFN-gamma secretion. In addition, the bispecific antibody Ps3Vm can also obviously inhibit tumor growth of mice.

The invention belongs to the field of tumor treatment and molecular immunology, and relates to an anti-CTLA4 and anti-PD1 bispecific antibody and application thereof. Specifically, the anti-CTLA4 andanti-PD1 bifunctional antibody comprises a first protein functional region targeting PD-1 and a second protein functional region targeting CTLA4, wherein according to an EU numbering system, a heavy chain constant region of immunoglobulin contained in the bispecific antibody mutates at any two or three of a 234th site, a 235th site and a 237th site, and after mutation, the affinity constant of thebispecific antibody and Fc[gamma]RIIIa and/or C1q is reduced compared with that before mutation. The bifunctional antibody disclosed by the invention can be well and specifically combined with CTLA4and PD-1, specifically relieves the immunosuppression of the CTLA4 and the PD-1 on the body, activates T lymphocytes and has a good application prospect.

The present invention relates to an antigenic B-cell multi-epitope peptide linked in tandem in the outer membrane protein(Omp) U gene of vibrio mimicus, a making method and an application thereof, which belong to the field of molecular immunology. The B-cell multi-epitope peptide linked in tandem can induce fish to make protective immunity response to vibrio mimicus infection. In the present invention, the amino acid sequence of the antigenic B-cell multi-epitope peptide linked in tandem in the OmpU is shown in SEQIDNO:10. The B-cell multi-epitope peptide linked in tandem in the OmpU of vibrio mimicus is made by a genetic engineering technique. The verification of immune blotting analysis, specific antibody detection and immune animal protective experiments shows that the peptide can elicit efficient and specific protective humoral immunity response to vibrio mimicus infection. The B-cell multi-epitope peptide linked in tandem can be used for the immune diagnosis and the immune prevention and treatment of aquatic animal ascitic diseases. The present invention has high social benefit and economic benefit.

The invention relates to establishment of a hybridoma cell strain for secreting duck NDV (newcastle disease virus)-resisting isolate monoclonal antibody, which belongs to the technical field of molecular immunology and virology. The purified HN protein expressed by duck NDV isolate SDO3 pronucleus is used as immunogen, one hybridoma cell strain capable of secreting duck NDV-resisting isolate monoclonal antibody is researched, and the preservation number is CCTCC C2013173. The NDV specificity monoclonal antibody secreted by the hybridoma cell strain cannot be specially combined with the NDV strain but can be specifically combined with NDV clinical wild strain, so that the NDV specificity monoclonal antibody can be used as an identification reagent to be used for identifying the NDV vaccine virus and clinical wild strain, and the specificity is strong; the sensitivity is 1: 212 HAU; the hybridoma cell strain has the advantage of high sensitivity.

The invention discloses a grass carp reovirus VP35 protein subunit vaccine, a preparation method and applications thereof, and belongs to the technical field of genetic engineering and molecular immunology, wherein the technical scheme is that the gene sequence of the subunit vaccine protein is represented by a sequence table SEQ ID No.1. The invention further specifically discloses a preparationmethod of the grass carp reovirus VP35 protein subunit vaccine, and applications of the grass carp reovirus VP35 protein subunit vaccine as the anti-grass-carp-reovirus-infection vaccine in improvement of the survival rate of grass carps infecting the grass carp reovirus. According to the present invention, the grass carp reovirus VP35 protein subunit vaccine is the novel antigen protein vaccine,has characteristics of simple preparation method, clear component, safety and stability, and can induce the high non-specific and specific immune responses of grass carp bodies so as to obtain the good immune protection effect.

The invention belongs to the field of tumor treatment and molecular immunology, and relates to an anti-VEGFA-anti-PD-1 bispecific antibody and an application thereof. Specifically, the anti-VEGFA-anti-PD-1 bispecific antibody comprises a PD-1-targeting first protein functional region and a VEGFA-targeting second protein functional region, according to an EU numbering system, a heavy chain constant region of immune globulin contained in the bispecific antibody mutates at two sites of 234 and 235, and after mutation, the affinity constant of the bispecific antibody is reduced compared to the affinity constant of Fc [gamma] RI, Fc [gamma] RIIa, Fc [gamma] RIIIa and/or C1q before mutation. The bispecific antibody disclosed by the invention can be specifically combined with VEGFA and PD-1, specifically relieve immunosuppression of VEGFA and PD-1 on an organism and inhibit angiogenesis caused by tumors at the same time, and has a good application prospect.

An anti-infectious immunopotentiator for animals is prepared through cloning the interleukin-4 gene of Tibetan pig, configuring its eukaryon expression plasmid VTPIL-4, preparing chitosan nanoparticles from deacetyl chitosan, and using said chitosan nanoparticles for molecular packaging of plasmid VTPIL-4. It can be used for immunizing experimental animal by intramuscular injection.

The invention belongs to the cross technical field of molecular immunology and virology, and particularly relates to a monoclonal antibody of avian reticuloendotheliosis virus envelope protein. The monoclonal antibody is characterized in that 1200bp of genetic fragment in a relative conservation region of an avian reticuloendotheliosis virus (REV) envelope (env) gene is selected, and 400 amino acids expressed by the fragment comprise more than 90% of antigen sites of the REV, so that most of the antigen sites of the virus are retained and the interference caused by genovariation is excluded, prokaryotic expression product His-env fusion protein is obtained by utilizing the env gene containing the conservation genetic fragment, the Balb/C mouse is immunized by the fusion protein, and the monoclonal antibody of the REV ENV (envelope) protein is obtained through fusion of oncocyte SP2/0 and splenocyte of the immunized mouse, screening and cloning. The monoclonal antibody provides a technical support for diagnosis and prevention as well as scientific research of avian reticuloendotheliosis.

The invention discloses a group of PD-L1-resisting monoclonal antibodies and a medical application thereof and belongs to the field of oncotherapy and molecular immunology. The invention specificallyrelates to the group of PD-L1-resisting monoclonal antibodies and the medical application thereof. According to the invention, the group of PD-L1-resisting monoclonal antibodies, having an excellent effect of blocking the interaction between PD-L1 and PD-1, are obtained through a hybridoma technology. Humanized modification and affinity maturation are successfully performed on the antibodies. Theantibodies provided by the invention show a great application prospect of preparing medicines for blocking and adjusting the function and level of the PD-L1 and significantly enhancing organism immunity especially medicines for treating cancer.