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   C 98


    Cytotoxicity of N-dodecanoyl-L-homoserine lactone and 5-N-dodecyl resorcinol to human granulocytes and monocytes: A comparative study [Electronic resource] / T. G. Sviridova, D. G. Deryabin, O. Cyganok, V. A. Chereshnev // Central European Journal of Immunology. - 2013. - Vol. 38, № 3. - P310-316. - Bibliogr. : p. 316 (21 ref.)

ББК 61
Рубрики: ЗДРАВООХРАНЕНИЕ. МЕДИЦИНСКИЕ НАУКИ
Кл.слова (ненормированные):
5-N-DODECYL RESORCINOL -- CYTOTOXICITY -- APOPTOSIS
Аннотация: Small molecules originating from microbes (SMOMs) play a significant role in bacterial-bacterial communication and in interactions between bacteria and their hosts. The aim of this study is a comparative analysis of the cytotoxic activity to human granulocytes and monocytes of two structurally close SMOMs: N-dodecanoyl-L-homoserine lactone (C12-HSL) and 5-N-dodecyl resorcinol (C12-AR). Cell viability was determined by Trypan blue dye exclusion. To distinguish cell death mechanisms, both necrosis and apoptosis tests were carried out. Cells undergoing apoptosis were identified by caspase-3 activity and the level of histone-associated DNA fragments. To evaluate cell lysis, the lactate dehydrogenase release test was used. In addition, the SMOM's action on erythrocyte membrane stability was investigated. The investigated SMOMs in micromolar concentrations showed more dose-dependent cytotoxicity against granulocytes than monocytes, but they used different mechanisms to impinge on the cell death pathway. C12-HSL specifically induced apoptosis similar to the activity previously reported for 3-oxo-N-dodecanoyl-L- homoserine lactone that originated from Pseudomonas aeruginosa. In contrast, C12-AR induced fast cytolytic effects (necrosis) as shown by the release of cytoplasmic lactate dehydrogenase, and presumably were defined by cellular membrane destabilisation. Our data demonstrate that both C 12-HSL and C12-AR can eliminate key defence cells, which would otherwise participate in the destruction of pathogenic bacteria. These results reinforce the SMOMs bifunctionality concept that such bacterial molecules not only regulate bacterial-bacterial interactions but also break immune defences as a new and important mechanism of host evasion

\\\\expert2\\nbo\\Central European Journal of Immunology\\2013. Vol.38, №3. С. 310-316.pdf
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   I-56


    Impact of bacterial autoregulatory molecules (homoserine lactones and alkylhydroxybenzenes) on the oxidative metabolism of the cell effectors of natural immunity / D. G. Deryabin, T. G. Sviridova, G. I. El'-Registan, V. A. Chereshnev // Microbiology. - 2013. - Vol. 82, № 2. - P133-141

ББК 57
Рубрики: БИОЛОГИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ALKYLHYDROXYBENZENES -- CHEMOLUMINESCENCE -- HOMOSERINE LACTONES
Аннотация: We investigated the impact of bacterial regulators homoserine lactones (HSLs) and alkylhydroxybenzenes (AHBs) (which are present in human fluids at pico- and nanomolar concentrations) on neutrophile oxidative metabolism. The HSL and AHB effects were determined using a test based on induced luminol-dependent chemoluminescence of neutrophiles in human peripheral blood. In this test, neutrophiles were preincubated with chemical analogs of bacterial autoregulators with different lengths of the hydrocarbon radical, such as HSL · HCl, C6- and C12-HSL, and C1-, C6-, and C12-AHB. We revealed that they suppressed the chemoluminescence and, accordingly, the oxidative metabolism of neutrophiles. This effect was more significant with HSLs than with AHBs. Within each of the two groups, the effect increased with an increase in the length of the hydrocarbon chain of the homologues. High concentrations of long-chain autoregulators of both types produce a cytotoxic effect that is associated with apoptosis in the case of C12-HSL and with cell membrane damage in the case of C12-AHB. The effects of low HSL and AHB concentrations involve their protein-modifying properties and result in changes in the activities of neutrophile oxidative enzymes. To a lesser extent, these effects are due to the pro- and antioxidant activities of HSLs and AHBs, respectively. In light of the results obtained, the HSL and AHB effects are to be considered as a novel mechanism of regulating the activities of cell effectors of natural innate immunity. In symbiotic and parasitic systems, the mechanism involves the bimodal pattern of the effects of HSLs and AHBs that vary depending on their structure and concentrations

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   S 96

    Sviridova, T. G.
    Homoserine lactones and resorcinolic lipids inhibit In vitro pro-and anti-inflammatory cytokine production / T. G. Sviridova, D. G. Deryabin, V. A. Chereshnev // Research Journal of Immunology. - 2013. - Vol. 6, № 1. - P7-16. - Библиогр.: с. 14-16 (27 ref.)

ББК 61
Рубрики: ЗДРАВООХРАНЕНИЕ. МЕДИЦИНСКИЕ НАУКИ
Кл.слова (ненормированные):
HOMOSERINE LACTONES -- RESORCINOLIC LIPIDS -- IMMUNE SYSTEM
Аннотация: Homoserine Lactones (HSLs) and Resorcinolic Lipids (RLs) originating from microbes and plants influence immune system, however, it is currently unclear whether HSLs and RLs are activators or suppressors of the cytokine network, especially in humans. A study has been carried out to investigate the effects of pure, synthetic HSLs and RLs with different chain lengths on pro-and anti-inflammatory cytokines produced by human blood monocyte cultures. Human monocytes (macrophages and lymphocytes) were collected from leukocyte-rich plasma, separated on a double density gradient, pre-treated with HSLs or Rls and then were inducted with standard either lipopolysaccharide or phytohemagglutinin stimulus. Quantitative assays for pro-and anti-inflammatory cytokines in the monocyte culture supernatants were performed using enzyme immunoassay kits for the quantitative determination of IL-1β, IL-2, IL-4, IL-10, TNF-α and IF-γ. We observed differences in cytokine production according to HSL and RL pre-treatment, increasing in the following order: IL-1β→IL-2≈IL-10≈TNF-α→IL-4→IF-γ. HSLs have been shown more pronounced inhibitory effects than Rls and long-chained homologs were more active than short-chained ones. Our study suggests that some small molecules originating from microbes and plants play an important role in cytokine network regulation and the immunomodulatory effect of HSLs and RLs may obstruct host defenses and affect inflammatory processes

\\\\expert2\\NBO\\Research Journal of Immunology\\2013. V. 6, N 1. P. 7-16.pdf
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   T 44


    The influence of bacterial autoregulation molecules (homoserine lactones and alkyloxybenzoles) on oxidative metabolism of the natural immunity cellular effectors. [Electronic resource] / D. G. Deryabin, T. G. Sviridova, G. I. El'-Registan, V. A. Chereshnev // Mikrobiologiia. - 2013. - Vol. 82, № 2. - P147-156

ББК 61
Рубрики: ЗДРАВООХРАНЕНИЕ. МЕДИЦИНСКИЕ НАУКИ
Кл.слова (ненормированные):
ANTIOXIDANT -- BENZENE -- DRUG DERIVATIVE

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