12 results about "Vaccine Immunogenicity" patented technology

The invention discloses a group A streptococcus mRNA (messenger Ribonucleic Acid) vaccine and application thereof, and relates to the technical field of biological medicines, in particular to the group A streptococcus mRNA vaccine and application thereof. The mRNA for coding the group A streptococcus antigen contains an open reading frame; the nucleotide sequence of the coding open reading frame is M12 <-N > + M1 <-N > + M4 <-N >, and is as shown in SEQ ID NO. 1; the antigen sequence of the group A streptococcus mRNA vaccine has no homology with human tissue protein through blastp comparison; the mRNA vaccine has strong immunogenicity, can effectively inhibit three GAS serotypes, and covers main GAS epidemic strains in China at present; the mRNA vaccine has the advantages of high efficiency, broad spectrum, high safety and simplicity and convenience in use, and is easy to popularize and use.

Crimean-Congo hemorrhagic fever virus (CCHFV) is a tick-borne virus that causes severe hemorrhagic fever disease in humans. Currently, no licensed CCHF vaccines exist, and the protective epitopes remain unclear. Here, we tested a DNA vaccine expressing the M-segment glycoprotein precursor gene (GPC) of the laboratory CCHFV strain CCHFV-IbAr 10200 (CCHFV-M10200). Increasing the dose of CCHFV-M 10200 provides complete protection from homologous CCHFV challenge in mice, and significant (80%) protection from challenge with the clinically relevant, heterologous CCHFV-Afg09-2990 strain. We also report complete protection from CCHFV-Afg09-2990 challenge following vaccination with a CCHFV-Afg09-2990 GPC expressing DNA vaccine (CCHFV-M Afgog). Finally, we show that the non-structural M-segment protein, GP38, influences CCHF vaccine immunogenicity and provides significant protection from homologous CCHFV challenge. Our results demonstrate that M-segment DNA vaccines elicit protective CCHF immunity and further illustrate the immunorelevance of GP38.

The invention relates to an application of a tripterine nano particle in preparation of an immunologic adjuvant. The tripterine nano particle comprises a nano aggregate and a polymer shell, wherein the nano aggregate is formed by self-assembly of tripterine or medicinal salt of the tripterine, and the outer surface of the nano aggregate is coated with the polymer shell. The invention develops a brand-new immunologic adjuvant strategy, namely, a product obtained by coating a nano aggregate formed by self-assembly of the tripterine or medicinal salt thereof with a polymer, and under the condition of using the same dosage, compared with tripterine free molecules or nanoparticles not coated with the polymer, the tripterine free molecules or the nanoparticles not coated with the polymer have better immunologic adjuvant effect. The product has a more remarkable effect of enhancing the immunogenicity of the vaccine. Therefore, the product can be applied as an immunologic adjuvant. Meanwhile, the preparation method of the product is simple and mild in condition, green and environment-friendly, low in cost, free of special reaction equipment and easy to popularize and apply.

The application discloses a porcine epidemic diarrhea virus and porcine delta coronavirus double vaccine and a preparation method thereof. The double attenuated live vaccine is prepared from a PEDV G2a genotype weak strain CH / HBXT-P240 / 2018 (the preservation number is CGMCC NO:45213), a PEDV G2b genotype weak strain CH / HNPJ-P240 / 2017 (the preservation number is CGMCC NO:5212) and a PDCoV weak strain CH / XJYN-P240 / 2016 (the preservation number is CGMCC NO:45211) as seed viruses for vaccine preparation, virus proliferation is carried out in combination with a cell suspension culture process, and the double vaccine is prepared through vaccine preparation and freeze-drying. The vaccine has strong immunogenicity, good cross-protection effect and high safety, can prevent piglet diarrhea caused by two kinds of coronaviruses at the same time, and is suitable for immune prevention and control in large-scale farms.

The invention provides a nucleic acid molecule related to HIV-1 (human immunodeficiency virus-1), a fusion protein and a preparation method and application thereof, and belongs to the technical field of biological medicine.The mRNA vaccine provided by the invention encodes the fusion protein, and the fusion protein is any one of a Ub-Gag fusion protein and a Ub-Pol fusion protein, the protein can efficiently induce HIV-1 specific cytotoxic T lymphocyte (CTL) response, so that the capability of eliminating latent viruses of an organism is enhanced, and the defects that an existing HIV-1 vaccine is insufficient in immunogenicity and immune escape is likely to occur are effectively overcome.

The invention discloses gE virus-like nanoparticles containing gI Th epitopes as well as a preparation method and application of the gE virus-like nanoparticles, and relates to the technical field of biomedicine. The gE virus-like nanoparticle is formed by self-assembling a plurality of monomers; the monomer comprises VZV gE and a VZV gI polypeptide containing a Th epitope. The gE virus-like nanoparticles can be applied to VZV vaccines, and the technical problems that the gE immunogenicity is weak and the vaccine side reaction is serious in the vaccine preparation in the prior art are solved. The gE virus-like nanoparticles provided by the invention significantly enhance the immunogenicity of gE, and the preparation method of the nanoparticles is simple. Compared with the Xinanlietai, the vaccine provided by the invention has the advantages of better immunogenicity, less immunopotentiator dosage and lower clinical side reaction, can induce gI specific CMI reaction, and is beneficial to further improvement of the effectiveness of the vaccine. The gE virus-like nanoparticle containing the gI epitope has good clinical application potential.

Provided are a truncated respiratory syncytial virus (RSV) F protein or a variant thereof, and a fusion protein comprising the same and a truncated body of human metapneumovirus (hMPV) F protein or a variant of the truncated body. Also provided are uses of the fusion protein as well as vaccines, immunogenic compositions, kits and pharmaceutical compositions comprising the same for the prevention and / or treatment of RSV and / or hMPV infection or diseases and / or symptoms caused by RSV and / or hMPV infection.

The invention discloses gE nanoparticles containing gI epitopes as well as a preparation method and application of the gE nanoparticles, and relates to the technical field of biomedicine, and the gE nanoparticles are formed by polymerizing a plurality of monomers; the monomers include VZVgE and a VZV gI polypeptide containing a Th epitope. The gE nano-particles can be applied to VZV vaccines, and the technical problems that the gE immunogenicity is weak and the vaccine side reaction is serious in vaccine preparation in the prior art are solved. Compared with the traditional Chinese medicine gE nano-particle, the VZV vaccine taking the gE nano-particle as the antigen has the advantages that the variety and the dosage of an immunopotentiator are less, the immunogenicity of the vaccine is equivalent to that of the traditional Chinese medicine gE nano-particle, and the clinical side reaction of the vaccine is lower; in addition, the gE nanoparticle vaccine not only can induce a gE specific CMI reaction, but also can induce a high-level gI specific CMI reaction, so that the effectiveness of the vaccine is further improved. In conclusion, the gE nanoparticles have good clinical application potential.

The invention discloses a method for preparing a foot-and-mouth disease subunit recombinant protein vaccine and evaluating immune efficacy of the foot-and-mouth disease subunit recombinant protein vaccine. By optimizing the prokaryotic expression process of the O-type FMDV VP1 protein, the obtained recombinant VP1 protein is mainly expressed in the form of an inclusion body; an adjuvant compatibility scheme adaptive to the recombinant protein is further designed, so that the immunogenicity of the vaccine is enhanced; meanwhile, a mouse-based immune efficacy evaluation method is established, and low-cost and short-period vaccine efficacy evaluation is realized by detecting the immunogenicity of the VP1 protein. The method effectively solves the problems that the prokaryotic expression VP1 subunit vaccine is insufficient in immune efficacy and high in evaluation cost, and provides efficient and practical technical support for research, development and industrialization of foot-and-mouth disease subunit recombinant protein vaccines.

The invention discloses a circular RNA vaccine based on a vasoactive intestinal peptide delivery system and application of the circular RNA vaccine, and relates to the field of RNA vaccines. Comprising vasoactive intestinal peptide VIP serving as a delivery carrier and circular RNA for coding a respiratory syncytial virus RSVpreF antigen, and the vasoactive intestinal peptide VIP and the circular RNA form a compound through non-covalent linkage; the vasoactive intestinal peptide VIP is a VIP-EGFP-N fusion protein. According to the invention, the function of the VIP as a high-efficiency cell-penetrating peptide is explored and verified for the first time, and the VIP is combined with a circular RNA molecule of a coding RSV key antigen protein preF to construct a safe, stable and high-efficiency RSV vaccine, so that the technical bottlenecks of poor stability of the existing mRNA vaccine, complex and low-efficiency LNP delivery system, insufficient immunogenicity or poor safety of the traditional RSV vaccine and the like are solved.

The application discloses an EB virus antigen of a chimeric design and application thereof. The EB virus chimeric antigen provided by the application is rationally designed based on structural biology, and gL, gH and gp42 proteins of an EB virus are connected through a linker. The antigen of the chimeric design simultaneously stably presents antigen epitopes of the three proteins, can increase the immunogenicity of a vaccine, and can simplify a production amplification process and quality control. The EB virus chimeric antigen can be used alone or in combination with other antigens, has high immunogenicity when used as a vaccine or a vaccine component, can induce an immune animal to produce a high level of neutralizing antibodies, can be used for preparing a vaccine for preventing or treating EB virus infection, and can be used as a detection reagent for the EB virus.

The invention relates to the technical field of biological medicines, in particular to an optimized SARS-CoV-2 chimeric virus-like particle based on an influenza virus skeleton and an application of the optimized SARS-CoV-2 chimeric virus-like particle. The amino acid sequence of the spike protein of the virus-like particle comprises an extracellular domain amino acid sequence; the amino acid sequence of the extracellular domain has S-6P mutation (F817P, A892P, A899P, A942P, K986P and V987P) and Frelin restriction enzyme cutting site substitution (RRAR-GSAS). The optimization mode can maintain natural trimer conformation before S protein fusion and effectively improve the stability of the S protein, so that the dissociation phenomenon of the protein is effectively improved, and the influence of the dissociation phenomenon on effective epitopes is avoided. In order to improve the secretory expression efficiency of the VLPs, the protein expression is optimized by using a signal peptide derived from an insect cell-baculovirus expression system. The immunogenicity and immune protection efficacy of the vaccine can be effectively improved.