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244 results about "Chronic infection" patented technology

Expanding the T cell repertoire to include subdominant epitopes by vaccination with antigens delivered as protein fragments or peptide cocktails

A convenient way of inducing a broad recognition of dominant and subdominant responses to epitopes of any given antigen of importance for prophylaxis or treatment of a chronic disease is provided. The method involves by immunizing with pools of overlapping fragments (synthetic peptides, e.g., 10-30 mers with 2-20 aa overlap) of the desired antigen in appropriate adjuvants. The T cell repertoire is primed to include not only the immunodominant epitope recognized when the intact molecule is used for immunization and induced by the chronic infection itself, but induce a much broader and balanced response to a number of the subdominant epitopes as well. The vaccination with peptide mix induces a T-cell response that includes response to subdominant epitopes is important for protection against chronic disease that on their own induces a response focused only on immunodominant epitopes. The major advantage of the present invention is that it requires no prior knowledge of the precise localisation and identity of the subdominant epitopes and their recognition in a human population, but expands the T-cell repertoire and thereby the total number of epitopes recognized by specific T cells primed by vaccination from a few immunodominant epitopes to a multiple of epitopes.
Owner:STATENS SERUM INST

Silver thiosulfate complex or silver-ammonia complex-containing hygroscopic silver-containing product and preparation method thereof

The invention relates to a silver thiosulfate complex or silver-ammonia complex-containing hygroscopic silver-containing product and a preparation method thereof. The invention discloses a hygroscopic silver-containing antibacterial product which comprises a silver thiosulfate complex or a silver-ammonia complex as an antibacterial ingredient, the silver thiosulfate complex or the silver-ammonia complex is evenly distributed and combined on the inner side and / or surface, the hygroscopic silver-containing antibacterial product comprises 0.01-10 wt% of silver, and the moisture absorption ability of the hygroscopic silver-containing antibacterial product is 6g/ g and above. The invention also provides a preparation method of the hygroscopic silver-containing antibacterial product as well as a silver-containing antibacterial product dressing prepared from the hygroscopic silver-containing antibacterial product. The hygroscopic silver-containing antibacterial product has a very wide antibacterial spectrum, shows strong antibacterial activity to gram-negative bacteria and gram-positive bacteria, is rapid in effect, has light stability, and can be widely applied to chronic infections exudative wounds.
Owner:FOSHAN UNITED MEDICAL TECH

Preparations that potentiate immunogenicity in low immunogenic antigens

This invention discloses means for obtaining immunogenic peptides, polypeptides, proteins, and their corresponding nucleic acid sequences, target cells with vaccine interest, or lysates thereof, without making structural changes in said antigens, through their association with Very Small Size Proteoliposomes. The object of the invention is to provide immunogenic compositions containing peptides, polypeptides, proteins, their corresponding DNA sequences, cells or their lysates and Very Small Size Proteoliposomes (VSSP), which are formed by binding the Outer Membrane Protein Complex (OMPC) of Neisseria meningitidis with gangliosides, by means of hydrophobic links. Additionally, it is stated that these compositions can be formulated alone or in the form of emulsions with the Incomplete Freund's Adjuvant (IFA), and may also be lyophilized. The essence of the invention consists in describing compositions that triggers immunogenicity in low immunogenic antigens, such as growth factor receptors, without imparting structural changes therein. Particularly, this invention refers to preparation of immuno-stimulating compositions capable of generating antigen-specific immune responses, even in immuno-compromised hosts, such as those suffering form cancer or viral or bacterial chronic infections. In said patients, the administration of the vaccine compositions described in this invention has lead to the reestablishment of the functionality of the immune system. Vaccine compositions of this invention can be used to protect or treat infectious, or auto-immune diseases.
Owner:CENT DE INMUNOLOGIA MOLECULAR CENT DE INMUNOLO

Replicative HBV (Hepatitis B Virus) vector carrying foreign gene and recombinant HBV generated after transfection and corresponding preparation method and application

ActiveCN103173492AGuaranteed high level of replicationPreserve the ability to reinfectMicroorganism based processesViruses/bacteriophagesHepatitis B virusVirus strain
The invention discloses a replicative HBV (Hepatitis B Virus) vector carrying a foreign gene and a recombinant HBV generated after transfection and a corresponding preparation method and an application. The vector separates overlaying genes C and P on an HBV genome by a molecular cloning technique based on originally expressed HBV plasmid to respectively form an integral opened reading frame where a protein translation starting sequence or a protease enzyme cutting site is inserted to respectively guide expression of foreign gene and gene P. The replicative HBV vector carrying the foreign gene transiently transfecting hepatoma carcinoma cell secretes the recombinant HBV. The recombinant HBV prepared from the HBV vector transfection cells provided by the invention can express the foreign gene and maintain the replicative and infecting capacity. The invention is suitable for constructing an HBV chronic infection animal model, an HBV cell model with cccDNA stably and automatically replicated and a traceable HBV strain, researching a molecular mechanism of HBV infection, replication, packaging and the like, and screening anti-HBV novel medicines.
Owner:BEIQIUEN INT PEACE HOSPITAL P L A

Preparation method of hydroxyapatite drug-carrying microsphere with multi-stage sustained-controlled release effect

InactiveCN107233318ATo achieve the effect of slow and controlled releaseEffective treatmentTetracycline active ingredientsInorganic non-active ingredientsApatiteFreeze-drying
The invention discloses a preparation method of a hydroxyapatite drug-carrying microsphere with a multi-stage sustained-controlled release effect, belonging to the field of biomedical materials. The preparation method comprises the following steps: (1) preparing a hydroxyapatite / chitosan microsphere by virtue of an electrostatic drop generation method, and carrying out high-temperature sintering, so as to obtain a porous hydroxyapatite microsphere; (2) soaking the porous hydroxyapatite microsphere obtained in the step (1) into medical liquid, and carrying out freeze drying, so as to obtain a drug-carrying hydroxyapatite microsphere; and (3) mixing the drug-carrying hydroxyapatite microsphere obtained in the step (2) with PLGA and a drug, and filtering under low-temperature conditions, so as to obtain the drug-carrying hydroxyapatite microsphere with a surface containing PLGA. The preparation method is simple, high in repeatability and applicable to industrial production; and the prepared drug-carrying microsphere is high in drug-carrying quantity, has a long-term sustained-controlled release effect and has relatively wide application prospects in the treatment of chronic infection and inflammation of bone defect.
Owner:HENAN INST OF ENG
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