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

Rabbit antibodies to cell wall mannans of various microbial strains and their mutants were found to be cross-reactive to cell carbohydrates of mammalian sperm and 4-6-days-old blastocysts. Immunochemical studies indicate that oligomers of alpha1 yields to 2, alpha1 yields to 3, alpha1 yields to 6, and probably also alpha yields to 4 linked mannose residues of sperm carbohydrates are available for antibody binding. At least 80 percent of binding activity of a yeast mannan antibody to sperm can be effectively inhibited by specific haptens or digestion with exo-alpha-D-mannosidase, an enzyme activity highest in testicular tissue. In order to determine the role of this enzyme in the metabolism of the cross-reactive mannan antigens of sperm, the relative amount of a specific alpha-linked oligomannosyl determinant of bovine sperm from homozygous normals was compared to that of hetero-zygous carriers of alpha-mannosidase deficiency. Extensive cross-reactivity between the microbial and mammalian oligomannosyl determinants suggest that these are conserved structures in cell carbohydrates, although the organization of these units in the microbial cell wall lipopolysaccharide has very little similarity to the carbohydrate moieties of mammalian glycoproteins.
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PMID:Cell antigens recognized by rabbit antibodies specific for oligomannosyl determinants. 7 30

Mouse amniotic fluid (MAF) was shown to be capable of suppressing those antibody responses observed in euthymic or athymic mouse spleen cell cultures to the T-independent antigens dinitrophenylated Ficoll (DNP-Ficoll) and trinitrophenylated lipopolysaccharide (TNP-LPS) and to the polyclonal B-cell activators LPS and purified protein derivative of tuberculin (PPD). Titration experiments demonstrated that the suppressive capacity of MAF for either LPS or DNP-Ficoll responses was maintained up to a MAF dilution of 1:120. Preincubation of spleen cells obtained from athymic mice with MAF for 8 h significantly suppressed polyclonal B-cell activation of such cells induced by LPS, although suppression was greater when MAF was present during the entire culture period. In addition, the suppressive activity that MAF demonstrated for antibody production induced by DNP-Ficoll or LPS was not lost as a result of dialysis. MAF also suppressed the secondary in vitro proliferative responses of lymph node cells sensitized to the T-dependent antigen human gamma globulin (HGG). HGG-induced proliferation of such cells appeared to be more susceptible to suppression effected by MAF than concanavalin-A-induced proliferation.
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PMID:Suppression of immunological activities by mouse amniotic fluid. 7 67

Young mice of dextran high responder strains were found to be complete nonresponders to the alpha-1-6 epitope of dextran during 30-40 days after birth. They also failed to respond to thymus-dependent dextran-protein conjugates. Cells from young and adult mice were activated equally well to polyclonal antibody synthesis by the polyclonal B-cell-activating property of dextran. There was no age difference in the immune response to haptens conjugated to dextran, indicating that dextran can function as an efficient carrier also in young mice. Unresponsiveness could not be attributed to suppressor T cells or to a suppressive environment in young animals, as shown by transfer experiments, in which living or irradiated cells from young and adult mice were admixed in various ways and transferred to irradiated recipients of different ages. Cells from young mice did not affect response of adult cells (and the reverse), nor did the age of the irradiated recipient influence the response. When lymphocytes from young and adult mice were polyclonally activated in vitro by lipopolysaccharide, only cells from young mice failed to synthesize antibodies against the alpha-1-6 epitope of dextran, although they produced antibodies of all other specificities tested for. It was concluded that young animals fail to express immunoglobulins directed against the alpha-1-6 epitope during the first 30-40 days after birth. Since the mice possess the VH gene coding for antibodies against this particular epitope, it was concluded that the timing of V gene expression is regulated during development, possibly at the V-C gene translocation level.
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PMID:Immunological unresponsiveness to native dextran B512 in young animals of dextran high responder strains is due to lack of Ig receptors expression. Evidence for a nonrandom expression of V-genes. 7 38

The lipopolysaccharide (LPS)-protein complex extracted from the cell wall of Escherichia coli K235 by the butanol-water technique has been shown to evoke a mitogenic response in bone marrow-derived (B) lymphocytes from the C3H/HeJ mouse strain. These mice are resistant to the effects of LPS extracted with phenol. Therefore, the ability of butanol-extracted LPS to modulate a spectrum of C3H/HeJ B-cell functions was investigated. Both butanol-extracted (LPS-B) and phenol-extracted (LPS-P) LPS preparations activated responder C3H/St spleen cell cultures to polyclonal antibody production, while only LPS-B activated C3H/HeJ spleen cells. Both LPS-P and LPS-B acted as adjuvants when injected after aggregated human gamma globulin (HGG) in C3H/St mice, but neither preparation was effective as a adjuvant in C3H/HeJ mice. LPS-P injected with deaggregated HGG (tolerogen) into LPS-sensitive mice has been shown previously to inhibit the induction of tolerance HGG. In the present studies, it was shown that LPS-B, but not LPs-p, was able to inhibit tolerance induction to HGG in the C3H/HeJ, whereas both preparations were effective in the C3H/St. LPS has also been shown to bypass tolerant T cells in LPS-sensitive mice late in tolerance to HGG at a time when B cells are responsive. However, in the C3H/HeJ, neither LPS-B nor LPS-P was capable of this function. The responsiveness of these B cells to HGG was demonstrated in transfer experiments. Thus, in the C3H/HeJ, LPS-B stimulates mitogenesis, polyclonal B-cell activation, and inhibition of tolerance induction, but cannot act as an effective adjuvant or as a bypass mechanism to activate B cells in the presence of tolerant T cells. The explanation for this pattern of responses may be attributable to yet another cellular defect in the C3H/HeJ mouse.
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PMID:Immunologic responsiveness of the C3H/HeJ mouse: differential ability of butanol-extracted lipopolysaccharide (LPS) to evoke LPS-mediated effects. 7 41

When mice are infected with either of several species of Plasmodium or Babesia the amount of Escherichia coli lipopolysaccharide (L.P.S.) required to kill them is decreased several hundred fold. The higher their parasitaemia the greater their susceptibility. There is indirect evidence that more L.P.S. than usual is present during infection with these parasites. In a very susceptible host this may be sufficient to produce endotoxin shock. Non-antibody mediators able to kill rapidly dividing cells, which are released during endotoxin shock, may then control the parasitaemia of acute primary attacks. This may explain why agents such as B.C.G., which produce responsiveness to abnormally low concentrations of L.P.S., protect against infection with certain of these parasities. It may also explain why host species naturally resistance to L.P.S. become ill only at high parasite concentrations, and why others with a naturally high susceptibility to L.P.S. become ill when infected with relatively few parasites. In the individual host convalescence from certain bacterial infections or concomitant infection with L.P.S.-producing organisms may vary the parasitaemia required to produce illness.
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PMID:Does endotoxin cause both the disease and parasite death in acute malaria and babesiosis? 7

The relative RNA content of single macrophages was measured by cytofluorometry after differential staining of cellular DNA and RNA with the metachromatic fluorescent dye acridine orange. This method allowed the differentiation of two major groups in the adherent macrophage population differing in their RNA content. After in vivo stimulation of mice (by injection of thioglycollate medium) or guinea pigs (by injection of oil), an increasing percentage of macrophages possessing a high RNA content is recovered. In vitro stimulation of macrophage cultures with lipopolysaccharide had the same enhancing effect on cellular RNA content. Cytofluorometric measurement of RNA content may possibly become an efficient and rapid method of measuring macrophage activation.
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PMID:Cytofluorometric analysis of macrophages activated in vivo or in vitro. 7 52

An extract made from the supernatant of Neisseria gonorrhoeae Gc2 strain 1291 degraded the Gc2 polysaccharide antigen. Chemical analysis of this polysaccharide indicated it contains glucose, galactose, glucosamine, galactosamine, glucosamine-6-phosphate, heptose, 2-keto-3-deoxyotonate, and ethanolamine and is the polysaccharide component of gonococcal lipopolysaccharide. Degradation of the polysaccharide by sonic extracts resulted either in complete loss of antigenicity and immunogenicity or in partial degradation to subunits that could inhibit the Gc2-specific hemagglutination inhibition. The factors responsible for degradation were destroyed by heating at 100 degrees C for 5 min or by Pronase digestion, but were unaffected by ribonuclease, deoxyribonuclease, Mg2+, Ca2+, or ethylenediaminetetraacetic acid. The process was pH dependent, with optimal activity occurring at pH 7. Sonic extract supernatants from group B and C meningococcal strains contained degrading properties, whereas similar extracts produced from Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Streptococcus pneumoniae type II failed to degrade the Gc2 polysaccharide.
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PMID:Degradation of the polysaccharide component of gonococcal lipopolysaccharide by gonococcal and meningococcal sonic extracts. 7 94

Mouse amniotic fluids (MAF) were tested for their inhibitory effect on the transformation of lymphocytes by concanavalin A, phytohemagglutinin or lipopolysaccharide of Escherichia coli, and on mixed lymphocyte cultures. Eight of the thirteen samples tested contained inhibitory activity equal or superior to 50 % of the controls. Pure preparations of mousealpha-foetoprotein (AFP) were obtained from these or other MAF-pools by immunoadsorption and/or by affinity chromatography on oestradiol-Sepharose. None of the isolated samples of AFP, whether originating from immunosuppressive MAF-pools or from pools lacking activity, exhibited a significant inhibitory effect on the in vitro transformation of lymphocytes. The suppressive properties of the MAF samples and the non-suppressive activity of samples of pure AFP were not affected by the addition of oestradiol-17 beta or after removal of endogenous oestrogens by exhaustive dialysis against 15 % dioxan solutions.
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PMID:Lack of inhibition by mouse alpha-foetoprotein (AFP) of in vitro induced lymphocyte blastogenesis. 7 28

Mice that have been injected with Corynebacterium parvum have mononuclear-cell infiltrates in the liver lobules. In such mice a small dose of lipopolysaccharide endotoxin produced a lethal hepatitis, with high serum-transaminase concentrations, glycogen depletion, and hypoglycaemia. It is suggested that lipopolysaccharide triggers the release from the infiltrating mononuclear cells of factors toxic for hepatocytes. Similarly certain parasitic and virus infections and graft-versus-host reactions can sensitise mice to the induction of hepatitis by exposure to small doses of lipopolysaccharide. This model may be applicable to human hepatitis.
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PMID:Role of mononuclear infiltrating cells in pathogenesis of hepatitis. 8 May 31

Murine interferons induced by viruses and by non viral substances such as lectins, tilorone, lipopolysaccharide and Brucella have been analysed by affinity chromatography on a column of Sepharose coupled to anti-bodies directed against viral interferon. B cell stimulants induced interferons which are antigenically related to viral interferon and T cell dependent mitogens induced an interferon species which appears to be antigenically and physicochemically different. Despite their antigenic differences, both kinds of interferon seem to follow similar pathways for the induction of the antiviral state (sensitivity to antimetabolites, and in vitro phosphorylation of a 67 000 MW protein).
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PMID:Some properties of interferons induced by stimulants of T and B lymphocytes. 8 Aug 30


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