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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 31 (2001), S. 0 
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The effect of porins purified from Salmonella typhimurium, Pasteurella haemolytica and Haemophilus influenzae on induction of tyrosine phosphorylation in THP-1 cells and C3H/HeJ macrophage was investigated. Incubation of porins at concentration of 1.0–5.0 μg ml−1 with either THP-1 or macrophage from C3H/HeJ mice resulted in tyrosine phosphorylation of specific host cell proteins. After porin stimulation a pattern of tyrosine phosphorylated proteins appeared in the soluble cytoplasmic fraction, in the membrane fraction and in the insoluble protein fraction. The observed effects were dependent on the porin concentrations; they reached a maximal expression at 3 min and declined at 60 min. Porin and lipopolysaccharide treatments induce a similar phosphorylation pattern in all of the three cellular fractions studied. A difference can be observed in the cytoplasmic fraction bands of 50–60 kDa, which are more evident after treatment with lipopolysaccharide, and in the insoluble fraction band of 80 kDa and the cytoplasmic fraction band of 250 kDa, which are more evident after treatment with porins. The events of tyrosine protein phosphorylation were present in macrophage from lipopolysaccaride-hyporesponsive C3H/HeJ mice stimulated with porins, while they were markedly reduced when the cells were stimulated with lipopolysaccharide. Staurosporine, genistein and cytochalasin D induced in the three cellular fractions a different inhibition pattern of tyrosine protein phosphorylation in porin stimulated cells. Porins extracted from the three bacterial species investigated behave in a similar way as stimuli more or less potent; Hib porin seems to be the most powerful stimulator and, moreover, it specifically induces phosphorylation of a 55 kDa band.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    The @Journal of Steroid Biochemistry and Molecular Biology 38 (1991), S. 407-413 
    ISSN: 0960-0760
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract This study investigates the effect of some components of the Staphylococcus aureus cell wall [lipoteichoic acid (LTA), N-acetyl-muramyl-alanyl-d-isoglutamine (MD), muramic acid (MA) and protein A (PA)] in modulating expression of cell-surface adhesion molecules CD11a/CD18, CD11b/CD18 on monocytes qualitatively and quantitatively. Monocytes incubated with bacterial components presented different CD11b/CD18 expressions which were dose-dependent in contrast to controls. The results obtained demonstrated that lymphocytes incubated with bacterial components also increased the expression of CD11a/CD18. The modifications in activation of CD11a/CD18 and CD11b/CD18 expression are probably correlated with modifications of membrane fluidity measured as polarisation fluorescence (P).
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    FEMS immunology and medical microbiology 10 (1995), S. 0 
    ISSN: 1574-695X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Abstract The capacity of liposomes constituted by dycetyl-phosphate (0.009 mM), cholesterol (0.017 nM), lecithin (0.003 mM), and myristic (0.1 mM), stearic (0.1 mM), or oleic acid (0.1 mM) to modify the lymphocyte response to Brucella melitensis antigens in mice was studied. Mice treated with antigens mixed with liposomes containing myristic, stearic or oleic acid had higher antibody titres than mice given antigen suspended in a saline solution. Liposomes alone, without Brucella antigens, resulted in increased 3H-thymidine incorporation by lymphocytes both in vivo and in vitro. The addition of polyclonal activators (LPS and ConA) caused a further increase of 3H-thymidine uptake. Moreover, spleen lymphocytes from mice inoculated with Brucella antigens mixed with the liposomes had a significantly lower population of B lymphocytes (10%), and a notable increase in the Tc lymphocytes (20%). Autoradiography of sections of popliteal ganglia of treated mice showed that the radioactivity was concentrated mainly in the membrane structures of the cell.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    European journal of epidemiology 4 (1988), S. 456-460 
    ISSN: 1573-7284
    Keywords: Phagocytosis ; Aggregates ; Granulocytes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A study was conducted on the granulocytic phagocytosis of bacterial aggregates obtained under ideal environmental conditions. For the strains studied, aggregation was favored by low salt concentrations, low pH and temperatures between 30°C and 40°C. Our results show that the phagocytic capacity of granulocytes depends on the type and size of these aggregates. Those formed by a smaller number of cells are more easily phagocytized than the larger ones.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Wir haben die Folgen einer Änderung der Lipid-Phase in Zell-Membranen von HEp 2-Zellen für die Empfänglichkeit für Herpes simplex Virus bestimmt und diese Ergebnisse mit Änderungen der Membran-Fluidität in Zusammenhang gebracht. Dies wurde durch Behandlung von HEp 2-Zellen mit gesättigten und ungesättigten Fettsäuren mit einer Kettenlänge von 8 bis 18 C-Atomen erreicht. Die Ergebnisse zeigen, daß mit gesättigten Fettsäuren von acht bis zehn C-Atomen behandelte HEp 2-Zellen sowohl eine erhöhte Membran-Fluidität als auch eine erhöhte Empfänglichkeit für eine Herpes simplex Virus-Infektion zeigen, während beide Parameter vermindert werden, wenn HEp 2-Zellen mit gesättigten Fettsäuren mit 14 und 18 C-Atomen behandelt werden. Fettsäuren mit 16 C-Atomen zeigen eine erhöhte Membran-Fluidität, die aber keine signifikante Korrelation zur Infektionsempfänglichkeit hat. Was ungesättigte Fettsäuren betrifft, so erhöhen die mit acht C-Atomen, 2-Oktensäure (trans-8 : 1[2]) und 2-Oktynsäure (8:::1[2]), in Infektiosität und die Fluidität, während geringe Konzentrationen an monoungesättigten Säuren mit 14 und 18 Kohlenstoff-Atomen, Myristolsäure (cis-14 : 1[9]) und Ölsäure (cis-18 : 1[9]) die Infektiosität und die Fluidität der Membran vermindern.
    Notes: Summary We have verified the consequences of alterations of the lipidic phase of HEp 2 cell membranes on susceptibility to infection from Herpes simplex virus, and have related these results to modification in membrane fluidity. This was carried out by treating HEp 2 cells with saturated and unsaturated fatty acids with chain lengths from eight to 18 carbon atoms. The results show that HEp 2 cells treated with saturated fatty acids with eight and ten carbon atoms have both increased membrane fluidity and increased susceptibility to Herpes simplex virus infection while both parameters were reduced when HEp 2 cells were treated with saturated fatty acids having 14 and 18 carbon atoms. Fatty acids with 16 carbon atoms, however, show an increase in membrane fluidity which has no significant correlation to infection susceptibility. As to unsaturated acids, those with eight carbon atoms, 2-octenoic acid (trans-8 : 1[2]) and 2-octynoic acid (8::: 1[2]), increase the susceptibility to infection and fluidity while low concentrations of monounsaturated acids with 14 and 18 carbon atoms, myristoleic acid (cis-14 : 1[9]) and oleic acid (cis-18 : 1[9]), reduce both the susceptibility to infection and the fluidity of the membrane.
    Type of Medium: Electronic Resource
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