215 results about "Mucosal immunity" patented technology

Disclosed are vaccines and immunogenic compositions which use live attenuated pathogenic bacteria, such as Salmonella, to deliver ectopic antigens to the mucosal immune system of vertebrates. The attenuated pathogenic bacteria are engineered to secrete the antigen into the periplasmic space of the bacteria or into the environment surrounding the bacteria. The vertebrate mounts a Th2-mediated immune response toward the secreted antigen.

The invention pertains to biological genetic engineering field, specificly relating to SARS vaccine of adenovirus carrier and preparation method, application of related coronavirus S gene in preparation of the SARS vaccine for preventing SARS. Through a bioengineering means, the related coronary virus S gene and a defective adenovirus are recombined, which makes protective immunogen protein or polypeptide expressing in it. A genic vaccine that can arouse the mucosal immunogenicity is produced through amplifying training, purification, and preparation, which induces a immunity reaction in the respiratory mucosa, makes the organism produce the corresponding antibody, and prevents virus from infection. Compared with the traditional inactivated viral particles vaccine, the invention has a high safety; it is convenient to operate; it is not limited by the specific conditions such as intramuscular injection; and it has an extensive clinical application prospect.

This invention relates to a fusion protein used for preventing aftosa, its preparation method and application. This fusion protein contains O type foot-and-mouth disease virus main cytomembrane protein VP1 epitope, colibacillus thermolability toxin B subunit, thymus derived cell epitope and purification label.

The invention is directed to methods and compositions for enhancing immunity, including mucosal immunity. The compositions include an antigen or immunogen, a ligand for a Toll-like receptor and at least one chemoattractant.

The invention discloses a recombinant helicobacter pylori protein vaccine and a preparation method thereof. The active ingredient recombinant fusion protein of the vaccine consists of recombinant LTAl-Ureal protein and LTB protein, the amino acid sequence of the recombinant LTAl-Ureal protein is shown as Seq ID No.1, the amino acid sequence of the LTB protein is shown as Seq ID No.2. Epitope-containing gene segments of Hp urease A subunit is inserted in an LTA subunit-encoded gene, a toxic part-containing segment is replaced to prepare a recombinant plasmid so as to express and obtain recombinant fusion protein polymer as a vaccine antigen, the fusion antigen and LTB protein pentamer are combined to form a hexamer structure, so that not only can the structure basis and activity of an LT mucosa adjuvant be remained, but also the toxicity can be removed, the immune response of organism muscosa can be effectively induced through immunity of mucosa path, to generate specific IgA antibody. The recombinant helicobacter pylori protein vaccine provides a vaccine manner for preventing and treating infection of helicobacter pylori.

The invention discloses a microneedle array which contains lipid modifying carrier and is used for a vaccine adjuvant transmission system. The microneedle array comprises a substrate and a plurality of microneedles fixed on the substrate, wherein the substrate is composed of saccharides, povidone, cellulose, or starch auxiliary materials; each microneedle comprises lipid A modifying carrier, the auxiliary materials (excipients) and vaccine ingredients; the lipid A modifying carrier can be lipidosome, lipid, micro-capsule or nanoparticle, and the like; the vaccine ingredients mainly refer to causative agent antigen proteins. Compared with the existing vaccine preparations, the lipid A-modified lipidosome microneedle array vaccine adjuvant transmission system can contain different vaccine ingredients to form vaccines aiming to different pathogens and therefore has a wide application scope. Biodegradable materials are selected and therefore the safety is high. The microneedle array vaccine adjuvant transmission system is a solid preparation which is high in stability and convenient to inoculate. Inoculation can be completed by a user self through oral mucosa, the vaccine can be prevented from running away along with saliva, and a body can be induced to establish mucosal immunity.

The present invention provides methods for boosting mucosal immunity in the female reproductive tract of pre- and post-menopausal women using a TGF-beta inhibitor, a Selective Estrogen Receptor Modulator, and/or a recombinant commensal bacterium that expresses endogenous microbicides into the intestinal tract or reproductive tract of a subject. It also provides methods for boosting innate and adaptive immunity by providing a glucocorticoid. Methods for preventing sexually transmitted infections including HIV infection are also provided.

The invention discloses a porcine epidemic diarrhea S1 protein fusion gene, recombinant bacillus megaterium strain and application. An antigen fusion gene shown as SEQ ID No. 1. is obtained by connecting an antigen locus of porcine epidemic diarrhea virus (PEDV) S glycoprotein and a cell wall anchoring sequence. The invention further constructs a secretion expression vector containing the antigen fusion gene, and secretion expression vector is converted into the bacillus megaterium to express recombinant protein on the cell wall or surface of the bacillus megaterium. Immunoblotting experiments indicate that the expressed recombinant protein can react with PEDV immune serum and has the same antigenicity as PEDV natural antigens. Immunofluorescent tests of live bacteria which are subjected to induced expression indicate that the expressed recombinant protein is positioned to the surfaces of the bacteria. Experiment results indicate that the recombinant protein can be prepared into safe and effective mucous immune live vaccines for preventing and treating porcine epidemic diarrhea.

This invention relates in part to synthesizing high value pharmaceutical proteins in transgenic plants by chloroplast expression for pharmaceutical protein production. We use poly(GVGVP), for example, as a fusion protein to enable hyper-expression of insulin and to accomplish rapid one step purification of fusion peptides utilizing the inverse temperature transition properties of this polymer. We also use insulin-CTB fusion protein in chloroplasts of nicotine free edible tobacco (LAMD 605) for oral delivery. This invention includes expression of native cholera toxin B subunit gene as oligomers in transgenic tobacco chloroplasts which may be utilized in connection with large-scale production of purified CTB, as well as an edible vaccine if expressed in an edible plant, as a transmucosal carrier of peptides to which it is fused to enhance mucosal immunity, and/or to induce oral tolerance of the products of these peptides. The present invention also relates in part to recombinant DNA vectors for enhanced expression of human serum albumin, insulin-like growth factor I, and interferon-α 2 and 5, via chloroplast genomes.

The invention provides methods and kits for immunizing animals (e.g. mammals) against viral antigens, including herpes-simplex virus type 2. The protective immune response elicited by the methods and kits of the invention is characterized by robust humoral, cellular, and mucosal immunity. In particular, the invention provides a heterologous immunization method comprising a priming DNA vaccine encoding an antigen and a boosting protein vaccine, in which the protein form of the antigen is encapsulated in liposomes. Methods of preventing primary acute, latent and recurrent viral infections, such as that caused by HSV-2 virus, and methods of providing passive protective immunity against a viral pathogen such as HSV-2 virus to a mammal are also disclosed.

The invention discloses a preparation method of a recombinant antimicrobial peptide extracted from a small intestine of a pig and an application thereof. The preparation method comprises the following steps: mashing, homogenizing and repeatedly freezing and thawing the small intestine tissue of the pig with a meat grinder and a colloid mill, and preliminarily crushing cells; then performing the water boiling heat treatment, and extracting with acetic acid solution to obtain a large amount of antimicrobial peptides; centrifuging to enable the quantity of other proteins to be reduced greatly, filtering the supernate obtained through centrifuging by a tangential flow micro-filtration membrane and a tangential flow ultrafiltration membrane sequentially, adjusting the pH value, filtering the supernate by a tangential flow nanofiltration membrane, concentrating and dialyzing to desalt, and disinfecting after adjusting the osmotic pressure to obtain the recombinant antimicrobial peptide extracted from the small intestine of the pig. According to the invention, the application of the recombinant antimicrobial peptide adopts effects of the antimicrobial peptide on aspects of mucosal immunity, immunopotentiators, novel antibiotics and the like, and the mucosal immunity character of the antimicrobial peptide can play an important role in the prevention and control of transmissible gastroenteristis, epidemic diarrhea and mycoplasma gallisepticum; the antimicrobial peptide replaces traditional antibiotics, and is remarkable in effect.

The invention relates to preparation and application of a mycoplasma hyopneumoniae multi-epitope mucosal vaccine. A mycoplasma hyopneumoniae membrane protein, an adhesive protein P97, a lipoprotein P65, a specific membrane protein P46, a B cell epitope, a Th epitope, a CTL epitope and a cholera toxin subunit B are taken as a vaccine frame structure, a pRSETA carrier is cloned in through flexible linker connection, then Escherichia coli is transformed, and fermentation, purification and preparation technologies are carried out, so that the mycoplasma hyopneumoniae multi-epitope mucosal vaccine with ideal immunogenicity is obtained. A self-made mucosal adjuvant is used in a preparation process, so that production and using processes of the vaccine are simpler and more convenient. Animal experiments show that the mycoplasma hyopneumoniae multi-epitope mucosal vaccine not only has good safety but also can stimulate effective mucosal immunity, humoral immunity and cellular immune reactions.

The invention relates to a preparation method of APP (Actinobacillus Pleuropneumoniae) OMVs (Outer Membrane Vesicles) and a vaccine of the APP OMVs, and belongs to the technical field of biology. The preparation method comprises the steps of culturing APP shope strains in vitro by using a culture medium which is in iron ion limit, obtaining acellular cultural supernatant after carrying out centrifugation and 0.22-[mu]m filtration treatment, and preparing the OMVs released by germs through ultracentrifugation, wherein the observation through a transmission electron microscope shows that the diameter of most OMVs is 50 to 100 nm, the OMVs are used as subunit vaccines to carry out secondary intranasal immunization on a mouse, the weight of the OMV immune mouse is increased for a long time, and the visual forms of lungs have no obvious difference from a PBS (Phosphate Buffer Saline) immune group. Meanwhile, an experiment shows that the OMVs are efficient immune stimulants, not only can high-level IgG (Immunoglobulin G) be stimulated to be generated by mouse sera, but also high-level IgA (Immunoglobulin A) can be generated in mouse lungs, mucosal immunity of the mouse lungs is effectively stimulated, and a better application prospect of using the OMVs as the subunit vaccines is expressed.

Compositions are provided comprising heat shock protein, immunoglobulins and retroviral antigens to induce systemic and mucosal immunity to infection from retroviruses such as Human Immunodeficiency Virus (HIV). Methods of treatment provided comprise administration of the compositions, which boost the immune systems response to the retroviral antigens or immunogens.

The invention relates to infant formula milk powder capable of promoting the development of the intestinal mucosal immunity function of a newborn and belongs to the technical field of infant formula milk powder production.The infant formula milk powder contains necessary substances such as protein, lactose, lipids, vitamins and minerals, and each 100g of the infant formula milk powder also contains 200-300mg of lysozyme and 3-5g of lactoferrin.The infant formula milk powder has the advantages that the infant formula milk powder uses breast milk as the reference, and the lysozyme and the lactoferrin are specially added according to the physiological and nutritional features of the newborn of 0-28 days; experiments prove that the intestinal structure, immunocompetent cell number and bacterial flora distribution conditions of the mice eating the infant formula milk powder are evidently better than those of a control group, and accordingly the infant formula milk powder can evidently improve the intestinal mucosal immunity function of the newborn.

The invention provides a recombinant Newcastle disease virus vector containing a novel coronavirus double-antigen target sequence combination and a corresponding vaccine strain and a vaccine, and relates to the technical field of biological medicines. According to the invention, an NDV vector, a novel coronavirus S protein gene and an S protein receptor binding domain RBD gene are used as antigen sequences, the S protein gene and the RBD gene are jointly inserted into an NDV genome, and a virus reverse genetics technology is utilized to rescue and obtain the vaccine strain with the infectious NDV virus limiting vector. The vaccine strain can be recognized by respiratory tract cells to generate mucosal immunity and infect the cells, so that the specific immune antibody level is increased. By introducing the double-antigen target, the immunogenicity of the vaccine strain is enhanced, the toxic and side effects of the vaccine strain are reduced, and the immune effect is better than that of a single-target antigen.