953 results about "Lipopolysaccharide" patented technology

Stimulation of one or more neurons of the sympathetic nervous system, including the splenic nerve, to attenuate an immune response, including an inflammatory immune response, is discussed. Devices and systems to stimulate the sympathetic nervous system to attenuate an immune response are also discussed. Devices discussed include pulse generators and drug pumps. Systems are described as optionally having one or more sensors and operator instructions. In specific examples, stimulation of the splenic nerve of pigs with a pulse generator is shown to be safe and effective in attenuating a lipopolysaccharide-induced immune response.

Endotoxin, also known as lipopolysaccharides (LPS), is the major mediator of septic shock due to Gram-negative bacterial infection. Chemically synthesized S3 peptide, derived from Sushi3 domain of Factor C, which is the endotoxin-sensitive serine protease of the limulus coagulation cascade, binds and neutralizes LPS activity. Fluorescent tagged-S3 is shown to detect LPS-containing bacteria. For large-scale production of S3 and to mimic other pathogen-recognizing molecules, tandem multimers of the S3 gene were constructed and expressed in E. coli. Tetramer of S3 for example is shown to display an enhanced inhibitory effect on LPS-induced activities. An affinity matrix based on tetramer of S3 is also shown to be particularly efficient at removing LPS.

A continuous method for preparing proteosome-amphiphilic determinant vaccines for parenteral or mucosal administration using diafiltration or ultrafiltration technology. The amphiphilic determinants include lipopolysaccharides from gram negative bacteria, e.g. S. flexneri, P. shigelloides and S. sonnei. Proteosomes are obtained from group B type 2b meningococci. The active proteosome-amphiphilic determinant complexes (non-covalent complexes) of the vaccine are formed using diafiltration or ultrafiltration to remove the detergent under non-static conditions. The use of diafiltration or ultrafiltration decreases processing time and the opportunity for contamination and further permits the use of ambient temperature and efficient scale-up. In addition, the process permits the reliable and continuous monitoring of the dializate which enhances the efficiency of the entire process. The time of dialysis for the production of a lot of vaccine is reduced from 7-10 days to less than 72 hours and usually less than 48 or 24 hours. The use of the process optimizes the presence of each antigenic component in the preparation of multivalent vaccines.

It has been found that dendritic cells can be prepared which cannot mature. These cells can provide signal 1 to T cells but cannot provide co-stimulatory signal 2. T cells which are stimulated by the permanently immature dendritic cells therefore anergise, so the dendritic cells are tolerogenic rather than immunogenic. The cells are generally CD40−ve, CD80−ve and CD86−ve, and remain so when stimulated by inflammatory mediators such as lipopolysaccharide. The cells can be prepared conveniently by the culturing adherent embryonic stem cells in the presence of GM-CSF.

The invention relates of administration of an attenuated Salmonella strain expressing a lipopolysaccharide O antigen from a suitable pathogen, in particular Pseudomonas aeruginosa, and the use of the same as a vaccine to promote sterile immunity to the pathogen, e.g., P. aeruginosa, via intranasal vaccination. In one embodiment, the present invention is directed to a unique intranasal route of immunization for the delivery of relevant heterologous polysaccharide antigens via a live, attenuated Salmonella strain.

The present invention relates to nucleic acids and polypeptides encoded thereby, whose expression is modulated in brain microvascular endothelial cells undergoing early dynamic inflammation-induced changes in blood-brain barrier functionality. Such polypeptides are referred to as lipopolysaccharide-sensitive (LPSS) polypeptides herein. These nucleic acids and polypeptides may be useful in methods for controlling blood-brain barrier properties in mammals in need of such biological effects. This includes the diagnosis and treatment of disturbances in the blood-brain / retina barrier, brain (including the eye) disorders, as well as peripheral vascular disorders. Additionally, the invention relates to the use of anti-LPSS polypeptide antibodies or ligands as diagnostic probes, as blood-brain barrier targeting agents or as therapeutic agents as well as the use of ligands or modulators of expression, activation or bioactivity of LPSS polypeptides as diagnostic probes, therapeutic agents or drug delivery enhancers.

The present invention provides non-toxic Gram-negative bacteria. In particular, the present invention provides viable Gram-negative bacteria (e.g., E. coli) substantially lacking lipopolysaccharide (LPS, endotoxin) within the outer membrane. The present invention further provides methods of generating viable non-toxic Gram-negative bacteria and uses thereof. The present invention also provides compositions and methods for inducing immune responses and for researching and developing therapeutic agents.

Endotoxin, also known as lipopolysaccharides (LPS), is the major mediator of septic shock due to Gram-negative bacterial infection. Chemically synthesized S3 peptide, derived from Sushi3 domain of Factor C, which is the endotoxin-sensitive serine protease of the limulus coagulation cascade, binds and neutralizes LPS activity. Fluorescent tagged-S3 is shown to detect LPS-containing bacteria. For large-scale production of S3 and to mimic other pathogen-recognizing molecules, tandem multimers of the S3 gene were constructed and expressed in E. coli. Tetramer of S3 for example is shown to display an enhanced inhibitory effect on LPS-induced activities. An affinity matrix based on tetramer of S3 is also shown to be particularly efficient at removing LPS.

A process for preparing the oligose of fucosan sulfate includes such steps as preparing the aqueous solution of fucosan sulfate, adding oxidant chosen from hydrogen peroxide, hypochlorous acid, nitrous acid, or their salts, heating, membrane ultrafilter, vacuum concentrating and freeze drying. Its advantages are high medical effect to protect liver and take care of health, and low cost.

New methods for diagnosis and treatment of human dormancy syndrome-related sequellae are provided. Human dormancy syndrome (HDS) is characterized by elevated serum ratio of rT3 / fT3 compared to a population of normal subjects. HDS includes fibromyalgia, chronic fatigue, cancer, autoimmune disease, obesity and related dormancy conditions. Dormancy and HDS-related sequellae are imposed on humans by infection with lipopolysaccharide (LPS; or endotoxin)-producing organisms, especially those that are intracellular and those that create antigens that stimulate the TLR pathways. In such instances, the elimination or neutralization of the LPS signal along with the infectious source is required to impact the sequellae of HDS. Treatment includes use of novel and non-obvious doses of antibiotics, optionally including agents that decrease the adverse effects of endotoxin.

This invention is directed to methods for removing, preferably simultaneously and in one step, multiple impurities form crude culture samples, and, in particular, the removal of media components, protein, nucleic acids, lipids, and lipopolysaccharides to ultralow levels. Preferably the purification process comprises: (1) binding of the target substance containing one or more contaminants to a chromatography matrix; (2) washing the bound target substance with one or more buffers containing a synergistic combination of a lyotropic agent or organic solvent, a detergent, and a salt component; and (3) desorbing the target substance from the chromatography matrix, so that the eluate contains ultra low levels of contaminants. The reduction of impurities that can be achieved is preferably 91-99.9% as compared to the amount of impurities in the target substance before purification. The invention is also directed to the targets products that have been so purified.

The invention relates to the use of IL-15 or active variants thereof and / or IL-15 activity enhancing compounds for the manufacture of a pharmaceutical composition for manipulating memory cells of the immune system, such as manipulating viability and / or responsiveness of said memory cells. The IL-15 activity enhancing compound is for example lipopolysaccharide (LPS). The invention further relates to the use of IL-15 inhibiting or eliminating compounds for the manufacture of a pharmaceutical composition for manipulating memory cells of the immune system. Such inhibiting or eliminating compounds are for example anti-IL-15 antibodies, anti-IL-15Rα antibodies, fragments of these antibodies, e.g. the Fab or F(ab′)2 fragment, soluble IL-15Rα, fusion proteins consisting of soluble IL-15Rα, and Fc fragment, compounds, e.g. peptides, binding and / or inhibiting functional IL-15 receptor, IL-15 antisense oligonucleotides.

The invention belongs to the field of traditional Chinese medicine pharmacy, and relates to the novel medical usage of icaritin, in particular to the usage of icaritin in preparation of medicine for preventing and treating endotoxemia. Lipopolysaccharide (LPS) is used for stimulating the macrophage system RAW264.7 of a mouse and establishing an extraneous endotoxic inflammation model, LPS is used for stimulating the C57BL / 6J mouse and establishing the endotoxemia animal model, icaritin is adopted for intervention, and dexamethasone is used as reference. The experiment result shows that the icaritin can reduce the death rate, the level of the inflammatory factor, the inflammatory mediator and the adhesion molecules and infiltration of inflammatory cells of the tissue after the mouse is attacked by endotoxin, and proves that the icaritin can effectively prevent and treat endotoxemia and can be used for further preparing effective drug for preventing and treating endotoxemia, including dosage forms such as oral and enteric capsules or intravenous injections.

The invention relates to the production of ganglioside specific antibodies. These antibodies are produced following immunization with lipopolysaccharide antigen of Campylobacter jejuni. The antibodies bind to monosialogangliosides, including GM2 and GM1.

Provided are methods of using gelsolin and active fragments thereof to neutralize, treat or prevent the pathogenic effects of lipopolysaccharide (LPS) endotoxins released from gram-negative bacteria, including massive activation of inflammatory response in a patient and the resulting lethal septic shock. The provided gelsolin binds LPS from various bacteria with high affinity, decreasing circulating LPS and neutralizes its deleterious biological effects. Consequently, the provided gelsolin replacement therapy offers a method for the prevention of LPS-induced mortality in the patient.

An immunogenic composition in a dose volume suitable for human use comprising an antigen or antigenic preparation, in combination with an adjuvant which adjuvant comprises an immunologically active saponin fraction derived from the bark of Quillaja Saponaria Molina presented in the form of a liposome and a lipopolysaccharide wherein said saponin fraction and said lipopolysaccharide are both present in said human dose at a level of below 30 μg.

The present invention relates to the use of a therapeutically effective amount of abscisic acid (ABA) or its analogs to treat or prevent inflammation induced by exposure to lipopolysaccharide (LPS) or respiratory inflammation. The invention also relates to methods and composition for enhancing vaccine efficacy using ABA.

The invention discloses application of fructus forsythiae aglycone in preparing a medicament for preventing or treating liver injury or liver failure, and belongs to the medical field. The fructus forsythiae aglycone is a traditional Chinese medicine monomer obtained by extracting from the conventional fructus forsythiae, and is shown to have better treatment effect for the liver injury caused by acetaminopben, the livery injury caused by anti-tumor drug cis-platinum, acute or chronic livery injury caused by carbon tetrachloride, the livery injury caused by D-galactosamine and the liver failure caused by the D-galactosamine and lipopolysaccharide according to an animal test, has effect, which is better than that of fructus forsythiae and fructus forsythiae aglycone, in treating liver injury or liver failure. The fructus forsythiae aglycone is exact in curative effect and low in side effect for treating the liver injury and the liver failure, and has wide medical application prospect.

Compositions comprising a source of alkaline phosphatase that prevent or reduce toxic influx of lipopolysaccharide (LPS) through mucosal layers of a mamalian body cavity and methods of using these compositions for those purposes are disclosed. Such a source of alkaline phosphatase, preferably in a medical food such as infant milk formula, is eaten, drunk or otherwise administered for prophylaxis or treatment of LPS-mediated or LPS-exacerbated disease.

The invention discloses a diterpenoid compound and the preparing method and application thereof. The diterpenoid compound is obtained by using aralia melanocarpa roots as the raw material through extractum extraction, organic solvent extraction, column chromatography on silica gel and high pressure liquid chromatography separation. The molecular formula of the diterpenoid compound is C20H30O3. The name of the diterpenoid compound is 14-oxygen-ent-8(9),15-(14-oxo-ent-pimara-8(9),15-diene-19-oic acid). The structural formula is as shown in the specification. According to the preparing method, aralia melanocarpa roots are used as the raw material, and extractum extraction, organic solvent extraction, column chromatography on silica gel and high pressure liquid chromatography separation are conducted to generate the diterpenoid compound. The diterpenoid compound can be applied to preparation of anti-inflammatory drugs for prevention and / or treatment. The diterpenoid compound is subjected to in-vitro anti-inflammatory activity testing, and experimental results show a good lipopolysaccharide (LPS) restraining effect and a good effect of inducting pulmonary alveolar macrophages (RAW264.7) to generate NO. A new compound or lead compound with high application value can be provided for the medical industry.

The invention relates to a micro-fluidic agglutinin chip, specifically to a method for preparing and modificating a micro-fluidic chip. The micro-fluidic chip is designed and prepared through a micro electro mechanical technology. Dissolved bacterial cellulose is regenerated in a micro channel to be as a filling material of chip channel columns, and agglutinin is fixed on the filling material surface which is subjected to hydrophilic modification; and according to specific affinity effect of agglutinin to glycosyl, substances containing specific glycosyl on the surface, such as glycoprotein and lipopolysaccharide and the like, are separated. The chip consists of a glass base material, channel graph is etched on the base material by an ultraviolet etching technology, and high-temperature bonding is performed by program temperature control. The chip is provided with an inlet and an outlet of a separation sampling, an inlet and an outlet of the filling material, a bacterial cellulose filled column, a sample micro channel and on-line monitoring points. By taking regenerated bacterial cellulose as the chip filling material, the micro-fluidic agglutinin chip has the main advantages of being excellent in effects of bacterial cellulose, simple in fixing step of agglutinin, convenient to perform spectrum monitor, and substantial in glycosyl separation effect.

Lysine-spermine conjugates with a long-chain aliphatic (C12-C20) substituent at R1 bind and neutralize bacterial lipopolysaccharides. These compounds reduce lethality in a murine model of lipopolysaccharide-induced shock, and may serve as novel leads for developing novel anti-lipopolysaccharide agents for the therapy of Gram-negative sepsis. These compounds are represented by the formula: wherein X is O or H, H; R is a hydrophobic C12-C20 chain and Y is -NH2 or -H; and pharmaceutically acceptable salts thereof and prodrugs thereof.

The invention relates to a fattening pig feed for improving the pork quality. The feed comprises the following components in percentage by weight: 72%-75% of corns, 10%-13% of 46.5% bean pulp, 1%-6% of wheat bran, 3%-7% of tea leaf powder, 1.2%-1.5% of bean oil, 1%-1.4% of stone powder, 1.2%-1.4% of calcium hydrogen phosphate, 0.3%-0.6% of salt, 3%-4% of premix, 0.2%-0.3% of lysine, 0.1%-0.2% of methionine and 0.1%-0.2% of threonine. Compared with the prior art, the feed is prepared by drying branches and leaves cut from tea trees, performing conventional or superfine grinding to prepare the tea leaf powder, and adding the tea leaf powder into the fattening pig feed instead of the bran according to a certain ratio; the prepared feed contains not only special nutritional ingredients such as protein, fat, carbohydrate and the like in the tea leaves but also medicinal ingredients such as caffeine, tea polyphenol, lipopolysaccharide, aromatic compounds and the like, and can effectively promote the growth performance of a fattening pig, enhance the anti-stress capability and improve the quality, flavor and mouth feel of pork.

The invention provides a broad-spectrum nucleic acid aptamer capable of identifying lipopolysaccharides of different Gram-negative bacterium sources. The broad-spectrum nucleic acid aptamer is obtained by directed screening on the basis of the capture-SELEX technology of label-free target molecules and immobilized nucleic acid libraries. A directed screening method of the broad-spectrum nucleic acid aptamer includes: using mouse salmonella typhi lipopolysaccharides as the unique target, using a biotin-avidin effect to fix random oligonucleotide libraries to Fe3O4 magnetic nano particles wrapped by avidin through biotinylated short complementary chains, performing incubation, separation, amplification, digestion single chain preparation, cloning sequencing and the like, adding complete active bacteria of salmonella and escherichia coli to serve as directed molecules to perform directed screening when the libraries are enriched to a certain degree, and one broad-spectrum nucleic acid aptamer capable of identifying four kinds of lipopolysaccharides is obtained through 15 rounds of repeated screening. The nucleic acid aptamer is applicable to the analysis and detection, separation and enriching, toxicity neutralizing and the like of the lipopolysaccharides in aspects of drinking water, food or clinical medicine and the like.

The present invention is used for evaluating the advantages of haliotis discus hannai. A multi-phase HPLC purification system is used to purify anti-inflammatory peptide from abalone (AAIP, abalone anti-inflammatory peptide). In tandem MS analysis, a fragmentation result shows that the amino acid sequence of the AAIP with nitrogen monoxide (NO) inhibitory activity (IC50=55.8[um]M) is Pro-Phe-Asn-Glu-Gly-Thr-Phe-Ala-Ser (1175.2Da). While the anti-inflammatory effect of RAW264.7 macrophages generated by the stimulus of the AAIP to lipopolysaccharides (LPS) is further studied, and the molecular mechanism is elaborated. The result shows that the AAIP peptide inhibits the nitrogen monoxide (NO) generation induced by the LPS through the expression of inducible nitric oxide synthase (iNOS) by a dose-dependent manner, and the gene transcription of pro-inflammatory cytokines is also obviously reduced, wherein the pro-inflammatory cytokines comprise such as interleukin (IL-1 beta), tumor necrosis factors (TNF-beta) and IL-6. In addition, the AAIP obviously inhibits phosphorylation of mitogen-activated protein kinases (MAPK), such as p-p38 and p-JNK. These results indicate that the AAIP inhibits inflammatory response induced by LPS by intercepting the MAPK pathway of the macrophages. Therefore, the AAIP can be applied to therapeutic drugs for inflammations treatment or healthcare food products.