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Query: UNIPROT:P43026 (lipopolysaccharide)
 62,215 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Immune serum injected into mice before a footpad challenge of virulent strain Brucella abortus 544 can prevent dissemination of infection to the spleen. Sera from mice infected with Brucella for at least 2 months or from mice vaccinated with a protein-bound cell wall peptidoglycan Brucella fraction completely stopped dissemination. Brucella lipopolysaccharide and polysaccharide cross-reacting Yersinia immune sera reduced dissemination. Both peptidoglycan and lipopolysaccharide immune sera injected simultaneously with an intravenous challenge caused a shift in Brucella from spleen to liver. When immune sera were injected simultaneously with an intravenous challenge, the kinetics of splenic infection showed two effects: an early one, optimally measured at day 7 postchallenge, showed reduced numbers in the spleen due to the shift of Brucella to the liver; a late effect, measured at day 21 postchallenge, showed reduced numbers in spleen and liver with nearly complete clearance by day 49 postchallenge. Brucella lipopolysaccharide and cross-reacting bacterial antisera induced the early effect only, whereas peptidoglycan and infected mouse sera induced both effects. When peptidoglycan immune serum was injected 2 or 7 days after intravenous challenge, the late effect was somewhat reduced. Hence, immune sera to protein and polysaccharide surface antigens can (i) prevent dissemination of systemic infection and (ii) help destroy intercellular bacteria (protein antigen only). These effects may represent a large part of vaccinal immunity.
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PMID:Immune serum-mediated effects on brucellosis evolution in mice. 640 7

Partial smooth-rough transition was observed in 30 strains of Yersinia enterocolitica O:3 cultivated at 37 degrees C. Immunodiffusion and haemagglutination inhibition tests with eight patients' sera demonstrated that the immunogenicity of the lipopolysaccharide of Yersinia enterocolitica in vivo was similar to that of the bacteria grown in vitro at 25 degrees C.
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PMID:Serological evidence that Yersinia enterocolitica lipopolysaccharide produced during growth in vivo resembles that produced during growth in vitro at 25 degrees C. 641 33

Progress since 1975 in the development of methods for the diagnosis of brucellosis is summarized. Standard serological diagnosis improved with increased use of acidified antigen agglutination and complement fixation tests. Immunoassays, tests based on the lysis of lipopolysaccharide coated erythrocytes and tests using new antigens have increased the sensitivity and specificity of serological results. The field of cellular immunology has seen the development and field evaluation of a skin test using refined antigens and the assessment of in vitro assays of cellular activity using purified protein and crude brucella antigens. Potential diagnostic uses of these methods are discussed. Bacteriological procedures were improved by introduction of stomachers and improved culture media. The isolation of new Brucella phages and development of a thin layer chromatography method for the determination of oxidation metabolic profiles were advanced in the characterization of Brucellae. Progress was also made in the development of immunoassays for the detection of Brucella antigens in host tissues. The selection of control groups, quality control studies and problems of standardization are areas that require greater attention in future methods development work. Major achievements of the period were 1) demonstrations that diagnosis sensitivity can be increased by new assays for antibody and cellular responses, 2) new methods to discriminate between anti-Brucella abortus and anti-Yersinia enterocolitica 0:9 responses, 3) a radial immunodiffusion test that detects most actively infected cattle, and 4) the simplification and extension of oxidative metabolic and phage typing tests. Advances in clinical microbiology and molecular biology have created new opportunities to improve diagnostic methods in the next decade.
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PMID:Recent progress in the diagnosis of brucellosis. 643 99

Antigenic phenol-phase soluble lipopolysaccharide isolated from Brucella abortus 1119-3 by hot phenol-water extraction was shown by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, controlled hydrolysis, periodate oxidation, methylation, and 1H and 13C nuclear magnetic resonance studies to be an S-type lipopolysaccharide which could be cleaved to yield a lipid A and an O-chain polysaccharide identified as an unbranched linear homopolymer of 1,2-linked 4,6-dideoxy-4-formamido-alpha-D-mannopyranosyl residues. The serological reactivity of bovine antiserum to B. abortus 1119-3 with the lipopolysaccharides of Yersinia enterocolitica serotype O:9 and Vibrio cholerae species has now been related to the occurrence of 1,2-linked N-acylated 4-amino-4,6-dideoxy-alpha-D-mannopyranosyl units in the O-chain polysaccharides of their lipopolysaccharides.
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PMID:Antigenic S-type lipopolysaccharide of Brucella abortus 1119-3. 643 81

Murine monoclonal antibodies that bind the O-antigens of Yersinia enterocolitica serotype O:9 and Brucella abortus 1119-3 were generated after immunization of BALB/c mice with killed, whole cells. Highly purified lipopolysaccharide preparations from each organism were used to screen for antigen-specific antibodies. Immunization with B. abortus cells induced 56 antigen-specific hybrids, and 10 of the highest antibody-producing clones were selected for further study. Seven of these clones secreted immunoglobulin G, and three secreted immunoglobulin M antibodies. Immunization with Y. enterocolitica cells resulted after fusion in 76 antigen-specific hybrid cell lines; from these, seven immunoglobulin G-secreting clones were selected for study. The serological cross-reactivity of the B. abortus and Y. enterocolitica O-antigens was established by enzyme-linked immunosorbent assay, immunoprecipitation, and agglutination tests with the monoclonal antibodies induced by each bacterium. This serological cross-reactivity is consistent with the structural identity of the two O-antigens established by chemical analysis.
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PMID:Serological confirmation of Brucella abortus and Yersinia enterocolitica O:9 O-antigens by monoclonal antibodies. 643 82

Two murine monoclonal antibodies of the IgG3 class have been isolated after immunization with Brucella abortus. An indirect immunofluorescence test was used to screen hybridoma supernatants and subsequently to determine the cross-reactivity of the monoclonal antibodies with other bacteria. One monoclonal antibody reacted with all the smooth Brucella biotypes tried and with Yersinia enterocolitica serogroup 0:9, though not with rough Br. ovis or with strains of Escherichia, Proteus, Salmonella, Pseudomonas, Francisella and Bordetella. The other monoclonal antibody displayed a high degree of specificity for brucellae carrying the A lipopolysaccharide-protein surface antigen. The implications for the diagnosis of brucellosis are discussed.
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PMID:A monoclonal antibody specific for the A antigen of Brucella spp. 643 72

A double immunodiffusion test for precipitins against Brucella antigen A2 was developed and applied to a variety of samples. The A2 precipitins were produced by a heifer infected with B. abortus strain 2308, cattle vaccinated with killed B. melitensis strain H38 or live B. abortus strain 19 and by a dog infected with B. canis. Precipitins were also detected in the second International Standard for anti-Brucella abortus serum, in several anti-B. canis sera and at low levels in one anti-B. ovis serum tested. Antisera produced in calves against Yersinia enterocolitica serotype 0:9 had no anti-A2 activity despite titers greater than or equal to 1/1024 and greater than or equal to 1/80 in standard Brucella agglutination and CF tests, respectively. The test for A2 precipitins lacked specificity as weak reactions were obtained with five of 295 sera from brucellosis-free herds. This test was relatively insensitive, detecting precipitins in only 16 of 24 sera from infected cattle and 27 of 54 sera positive by complement fixation and enzyme labelled antiglobulin tests performed with whole cell and smooth lipopolysaccharide antigens, respectively. The A2 precipitins were detected in nine sera from five cattle, in two infected herds, which were negative by agglutination and complement fixation tests.
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PMID:The bovine immune response to Brucella abortus IV. Studies with a double immunodiffusion test for antibody against A2. 679 Jan 44

It was demonstrated by a radioimmunoassay procedure that Brucella abortus agglutinins from noninfected cattle sera, absorbed to B. abortus antigen and eluted with ethylenediaminetetraacetic acid (EDTA), was immunoglobulin M that bound to that bacterium by its Fc portion. The EDTA-eluted immunoglobulin M agglutinated intact B. abortus cells but not erythrocytes treated with B. abortus lipopolysaccharide. The specificity of the EDTA-eluted immunoglobulin was for B. abortus, although a small titer to Yersinia enterocolitica serotype O:9 was observed. In contrast, immunoglobulin M purified from the serum of a cow injected 7 days previously with heat-killed B. abortus bound to the antigen by its Fab portion, was not labile to EDTA treatment, cross-reacted extensively with Y. enterocolitica serotype O:9, and agglutinated various other bacterial antigens and normal erythrocytes.
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PMID:Ethylenediaminetetraacetic acid (disodium salt)-labile bovine immunoglobulin M Fc binding to Brucella abortus: a cause of nonspecific agglutination. 679 May 68

An enzyme-linked immunosorbent assay (ELISA) for the detection and quantitation of human immunoglobulin M (IgM), IgG, and IgA antibodies against Yersinia enterocolitica by using lipopolysaccharides as antigens is described. The results obtained with the lipopolysaccharide ELISA were compared with the results of the whole bacterium ELISA. The correlations observed were good for each immunoglobulin class. Cross-reactions between Y. enterocolitica serotypes O:3 and O:9, Yersinia pseudotuberculosis IA, and Brucella abortus were studied by human and rabbit antisera in the whole bacterium and lipopolysaccharide ELISAs and by rabbit antisera using ELISA inhibition. The greatest cross-reactivity observed was that of the anti-Brucella serum with Y. enterocolitica O:9 in the whole bacterium ELISA. In the lipopolysaccharide ELISA this cross-reaction was not demonstrable with the rabbit antiserum, but it was strong with the human antiserum. However, differential diagnosis was possible with ELISA inhibition. On the basis of our experience, we are now routinely using whole bacterium ELISA for the determination of class-specific Yersinia antibodies, and potential cross-reactions are controlled by the ELISA inhibition.
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PMID:Measurement of immunoglobulin M, immunoglobulin G, and immunoglobulin A antibodies against Yersinia enterocolitica by enzyme-linked immunosorbent assay: comparison of lipopolysaccharide and whole bacterium as antigen. 679 May 70

The study of 270 serum samples obtained from chronic brucellosis patients in the passive hemagglutination test have revealed that in the presence of specific brucellosis hemagglutinins cross reactions with Yersinia antigen may occur. This phenomenon is probably due to the presence of common antigenic determinants in the lipopolysaccharide fractions of Brucella abortus 99 and Yersinia enterocollitica 09. The passive hemagglutination test has revealed that 2-mercaptoethanol-sensitive antibodies (IgM) to both homologous and heterologous antigens are mainly present in chronic brucellosis patients.
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PMID:[Importance of cross reactions in evaluating the serological diagnosis of human brucellosis. II. Examination of brucellosis patients by the passive hemagglutination reaction using homologous and heterologous erythrocyte diagnostica]. 681 29


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