45 results about "Cross-presentation" patented technology

Methods for eliciting in an animal in need thereof a cell-mediated immune response specific to an antigen, the method comprising providing an antigen preparation comprising particles on the surface of which the antigen is attached, and administering the antigen preparation to the animal, wherein the particles are taken up by antigen presenting cells (APC) of the animal via phagocytosis, forming a phagosome inside the APC, wherein the antigen is attached to the surface of the particle in such a way that the antigen is released in the phagosome before the phagosome fuses with a late endosome or a lysosome, and wherein the antigen is cross-presented on a Class I MHC molecule. Also provided are particulate antigen preparations or particulate vaccines that can be delivered to an animal in need thereof for vaccination against, for preventing or treating, a disease related to the antigen, such as cancer and a viral infection.

The invention relates to a cationic phospholipid-polymer hybridized nanoparticle vaccine adjuvant of a common-carrier antigen, MPLA (Monophosphoryl Lipid A) and IMQ (Imiquimod) as well as a preparation method and application thereof. The vaccine adjuvant is characterized in that the IMQ as a TLR7 agonist is loaded on a hydrophobic core; the MPLA as a TLR4 agonist is loaded in a phopholipid layer;cationic phospholipid DOTAP (1,2-dioleoy-3-trimethylammonium-propane) in the phopholipid layer is used for adsorbing an antigen; the antigen is protected through hybridized nanoparticles, and the ingestion of the antigen by dendritic cells is improved; immune response after antigen stimulation is improved remarkably through the TLR agonist, and cross-presentation of the antigen is improved remarkably. The hybridized nanoparticles as the vaccine adjuvant can load the antigen and different types of TLR agonists simultaneously, can deliver the antigen through a plurality of immune paths, and promotes the DC activation and maturation. The cross-presentation level is raised, a strong and powerful T-cell killing effect is achieved, cell factor secretion is induced, a long-term memory T-cell reaction is generated, and higher prevention capability for tumors is achieved.

The invention relates to a DCs vaccine based on phospholipid hybrid polymersome jointly encapsulating an antigen and dual immunoagonists, a preparation method and application thereof. The phospholipidhybrid polymersome which can jointly load a model antigen OVA and two types of TLR agonists (TLR7/8 and TLR4) is used for stimulation in vitro of the DCs so as to realize the effective phagocytosis of DCs cells. The rapid and long-term immunostimulatory effect on the DCs is achieved by the internal and external co-loading of the OVA antigen. The synergistic effect of the two types of TLR agonistssignificantly enhances the immune response after antigen stimulation; the phospholipid hybrid polymersome which jointly encapsulates the antigen and the dual immunoagonists can effectively promote the activation and maturation of the DCs, increases the level of cross-presentation, promotes the migration of the DC vaccine to secondary lymphoid organs, and produces a strong specific cytotoxic T lymphocytes (CTLs) killing effect, thereby effectively killing tumor cells and realizing the immunotherapy of the DCs vaccine on tumors.

The invention discloses a hydrophobic-modified polyethyleneimine and application thereof as a protein carrier. The structural general formula of the hydrophobic-modified polyethyleneimine is disclosed in the specification, wherein n is any natural number ranging from 5 to 20, and X is Cl, Br or I. The hydrophobic-modified polyethyleneimine can be compounded with protein to form stable nanoparticles, and thus, can be used as a protein carrier. Compared with the prior art, the hydrophobic-modified polyethyleneimine disclosed by the invention has strong protein binding force, can carry antigen protein, can be recognized by antigen presenting cells, and can initiate immunoreaction; and meanwhile, the hydrophobic-modified polyethyleneimine enhances the antigen cross-presentation effect, obviously lowers the cytotoxicity, is beneficial to enhancing the immunotherapeutic effect, and is an excellent therapeutic tumor vaccine nano carrier system.

The invention relates to the regulation of the immune system, and in particular to the finding that the CLEC9a molecule is a marker for dendritic cells which are capable of cross-presenting extracellular antigens via the MHC class I pathway. This makes them particularly suitable for generation of cytotoxic T lymphocyte responses. Materials and methods are provided both for the induction of immune responses against target antigens, and for the inhibition or suppression of undesirable immune responses in which these cells are involved.

The present inventors worked on elucidating the mechanism of antigen cross-presentation by dendritic cells, and revealed that foreign antigens taken up in dendritic cells are degraded by proteasomes after undergoing polyubiquitination. Based on the novel finding that polyubiquitination is involved in cross-presentation, the promotion of polyubiquitination was attempted by a number of methods, and the promotion of antigen presentation was confirmed. These methods enable the production of dendritic cells effective for inducing CTL activation.

The invention relates to a mannose modified co-loaded antigen and a double immuno-agonist phospholipid hybrid polymer vesicle as well as a preparation method and application thereof. A vaccine carriertakes an amphiphilic triblock copolymer as material, OVA is loaded in the hydrophilic inner cavity, IMQ is loaded in the hydrophobic membrane layer, DOTAP cationic layer is fitted with MPLA, and cationic lipid outer layer adsorbs outer layer OVA; phospholipid with reactive group is introduced to pass the targeted mannose ligand through covalently linked to the PEG-active distal end of the polymer-loaded vesicle surface, integrating the functions of active targeting of tumors, co-delivery of antigens and adjuvants and the like; the vesicle has the characteristics of small particle size, good dispersion, high antigen loading and good biocompatibility, etc., which can promote antigen uptake, DC activation and maturation, antigen cross-presentation, antigenic lymph node migration, lymphocyteactivation, effector T cell immune response, CD8<+> T and CD4<+> T cell responses, and memory T cells immune response.

The present disclosure provides vaccine compositions comprising at least one adjuvant and at least one antigen, wherein the adjuvant is a cationic lipid. The disclosure also provides methods of treating a disease in a mammal, methods of preventing a disease in a mammal, and methods of effecting antigen cross presentation to induce a humoral immune response and a cellular immune response in a mammal utilizing the vaccine compositions. Cross presentation of various antigens can be achieved by formulating the specific antigens with cationic lipids possessing adjuvant properties.

The present invention provides application of crosslinked polyethylenimine as an oncoprotein antigen vaccine vector, and overcomes the problem that protein antigen after penetration into the body can be degraded easily by enzyme, leading to weak immunogenicity of the vaccine. In an aqueous solution, the polymer material is capable of forming a complex antigen nanoparticle with antigen, in order to achieve loading of tumor protein antigen. The present invention uses RF33.70 as a target cell model, OVA as a model antigen, and C57BL / 6 mice bone marrow-derived dendritic cells as antigen cross presenting cells, and detects the antigen cross-presentation, cytotoxicity and in vivo anti-tumor effect of the complex nanoparticles formed by biodegradable PEI as the antigen vector and the OVA.

A lymphoma cell line was engineered to express surface IgG1 Fc. These tumor cells were taken up rapidly by DCs, leading to enhanced cross-presentation of tumor-derived antigen to CD8 T cells. IgG1-Fc tumors failed to grow in vivo and prophylactic vaccination in an animal model resulted in rejection of unmanipulated tumor cells. Furthermore, IgG1-Fc tumor cells were able to slow the growth of an unmanipulated primary tumor when used as a therapeutic tumor vaccine. This demonstrates that engagement of Fc receptors by tumors expressing the Fc region of IgG1 can induce efficient and protective anti-tumor CD8+ T cell responses without prior knowledge of tumor-specific antigen.

The invention belongs to the technical field of tumor prevention and treatment and concretely relates to a Clec9a-targeting affinity peptide WH peptide and its preparation method and use. The peptide comprises 12 amino acids, has an amino acid sequence of WPRFHSSVFHTH and can be prepared through an Fmoc solid-phase synthesis method. The peptide can be used in tumor prevention and treatment. The peptide can be obtained through phage-displayed peptide library technology screening. The result of the research on an in-vivo and in-vitro foreign antigen cross presentation capacity and induction cases of specific CTL reaction shows that the WH peptide as a targeting carrier can well induce specific CTL response, improve IFN-gamma and related cell killing molecule expression quantity and improve tumor resistance. Through a computer simulated molecular docking technology, a possible docking area between the WH peptide and the Clec9a protein and action sites of the possible docking area can be researched. The peptide provides good reference and reference significance for related research.

The invention provides a bacterial outer membrane vesicle carrier as well as a preparation method and application thereof. The invention provides a vaccine universal vector OMV-SpyC-SPAb which is constructed on the basis of a B structural domain SPAb of staphylococcus aureus protein A, is based on bacterial outer membrane vesicles and can target dendritic cells, the B structural domain SPAb of the staphylococcus aureus protein A is displayed on the bacterial outer membrane vesicles and can be rapidly combined with an antibody (such as an Anti-DEC205 antibody) of the targeted dendritic cells, and a novel OMV-OVA-DEC vaccine capable of targeting the dendritic cells and obviously enhancing antigen intake is prepared by using the SpyCatcher/SpyTag molecular glue to display the antigen on the surface of the bacterial outer membrane vesicles, so that the cross presentation of the dendritic cells on the antigen can be promoted, and the specific immune response can be induced, thereby achieving the anti-tumor purpose and having a wide application prospect.

The invention relates to a preparation and a preparation method thereof, which belong to the technical field of anti-tumor medicament. The preparation comprises the following components in percentage by weight: 0.3 to 3 percent of hydrocarbonate or carbonate, 0.0001 to 5 percent of tumor proteantigen, 0.1 to 10 percent of lipid and the balance of water. The preparation can promote the cross-presentation of protein or polypeptide antigen loaded by the preparation so as to cause specific cellular immunity and fulfill the purpose of curing tumor or virus infection.

The invention is in the field of immunotherapy. The present invention provides antibodies useful in therapeutic and diagnostic applications targeting human SIRPa, said antibodies enhancing the cross-presentation of antigens to T cells. The invention also provides antibodies against specific isoforms of SIRP a and able to disrupt the interaction between those isoforms of SIRP a and human CD47 for use in treating or preventing a disease, or diagnostic applications, and methods for producing and/or selecting anti-human SIRPa antibodies that bind with different affinities to various isoforms of human SIRP members.

The invention discloses a CCL1-containing fusion protein, a preparation method and application, the fusion protein sequentially comprises an IgE signal peptide, CCL1, a linker and an antigen from an N terminal to a C terminal, or the IgE signal peptide, CCL1, the linker, the antigen and a T2 fragment, and the amino acid sequence of the T2 fragment is shown as SEQ ID NO: 4. According to the invention, different antigen proteins are transferred and crossly presented to the surface of the DC cell by utilizing the chemotactic binding capacity of CCL1 and surface receptors of immune cells such as the DC cell, so that the efficiency of phagocytosis, processing and presentation of various antigen proteins by the DC cell is improved, and the effect of preventing and treating related diseases is improved. Experiments prove that the T2 sequence disclosed by the invention has a very strong immune enhancement effect, and can further excite body fluid and cellular immune response in the process of promoting antigen presentation, so that the effect of inhibiting growth of related tumors is finally achieved.

The invention provides a varicella-zoster virus vaccine and application thereof, and belongs to the technical field of vaccines. The varicella-herpes zoster virus vaccine comprises liposome nano-particles, herpes zoster virus glycoprotein E and an adjuvant, wherein the herpes zoster virus glycoprotein E and the adjuvant are entrapped in the liposome nano-particles; the adjuvant comprises triterpenoid saponin. In the invention, after the herpes zoster virus glycoprotein E (gE) is wrapped by the liposome nanoparticles, antigen presenting cell phagocytosis and efficient antigen delivery can be effectively promoted, and sustained release of the vaccine is realized to continuously stimulate a body to generate specific cellular immune response aiming at VZV-gE. The triterpenoid saponin used in the invention can effectively realize cross presentation of antigen herpes zoster virus glycoprotein E and induce antigen-specific cellular immune response. Moreover, cholesterol rich in the lipid nanoparticles can effectively neutralize the cytotoxicity of the triterpenoid saponin, so that the safety of the vaccine is ensured.

The invention provides an antigen and adjuvant co-delivery nano vaccine based on protamine as a carrier. The nano vaccine comprises a carrier, an antigen and an adjuvant, wherein the carrier is protamine sulfate; The invention also provides a preparation method and application of the vaccine. The nano vaccine prepared by the invention can effectively improve uptake efficiency of antigen presentingcells on antigens and adjuvants, efficiently stimulate maturation of the antigen presenting cells, assist the antigens in realizing cross presentation, significantly improve in-vivo transfer efficiency of the antigens and the adjuvants, stimulate a body to produce high-efficiency humoral immunity and cellular immunity, and at the same time produce an immune memory effect. In-vivo treatment is carried out on mouse subcutaneous melanoma, and it is proved that the nano vaccine has a good anti-tumor immunotherapy effect. The nano vaccine is simple in structure, convenient to prepare and excellentin immunotherapy performance, and has good application potential.

Cell loss by apoptosis is a common feature in certain conditions, including cancer. Dying tumor cells induce immune tolerance within the tumor microenvironment largely through highly conserved homeostatic clearance programs that are designed to restore tissue homeostasis and contribute to the formation of an immunosuppressive niche. The translocation of phosphatidylserine (PS) on cellular membranes, during the initial phases of apoptosis, functions as a recognition and removal signal that limits the immunogenicity of cell death. To remove inhibitory signals in the homeostatic clearance pathway a fusion protein comprising a phosphatidylserine binding domain and an immunostimulatory domain can restore immune responses to dead tumor cells in antigen cross presentation assays and promotes recruitment and retention of tumor antigen specific immune effector cells into tumors. These effects combine to elicit anti-tumor immunity, improve responses to immune checkpoint inhibitors, and enhance the effectiveness of adoptive T cell transfers using engineered T cells.

The invention discloses an endoplasmic reticulum Golgi apparatus targeting micromolecule. The structural formula of the endoplasmic reticulum Golgi apparatus targeting micromolecule is as shown in formula I, the invention also provides an endoplasmic reticulum Golgi apparatus targeting micromolecule conjugate, and the structural formula of the conjugate is as shown in the formula III. The invention also provides an application of the endoplasmic reticulum Golgi apparatus targeting micromolecule and the conjugate in preparation of an STING protein agonist, or in improvement of an antigen cross presentation level, or in improvement and enhancement of antigen targeting endoplasmic reticulum Golgi apparatus, or in preparation of a drug for inducing CD8 + T immune response, or in preparation of an immunotherapy drug. According to the endoplasmic reticulum Golgi apparatus targeting micromolecule and the conjugate provided by the invention, good connection between the endoplasmic reticulum Golgi apparatus targeting micromolecule and an antigen can be realized, the binding force of a bis-benzopyrimidine skeleton to STING protein is maintained, systemic inflammatory response caused by excessive diffusion of an STING agonist diABZI is reduced, the antigen targeting endoplasmic reticulum Golgi apparatus at a subcellular level is enhanced, and the immunogenicity of the antigen is improved. The antigen cross presentation level is improved, DC cell maturation can be promoted, and CD8 + T immune response is efficiently induced.