2 research outputs found

    Pairing Bacteroides vulgatus LPS structure with its immunomodulatory effects on human cellular models

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    15 p.-5 fig.-1 tab.-1 graph abst. This paper is dedicated to Prof. Jesús Jiménez-Barbero for his 60th birthday.The gut microbiota guide the development of the host immune system by setting a systemic threshold for immune activation. Lipopolysaccharides (LPSs) from gut bacteria are able to trigger systemic and local proinflammatory and immunomodulatory responses, and this capability strongly relies on their fine structures. Up to now, only a few LPS structures from gut commensals have been elucidated; therefore, the molecular motifs that may be important for LPS–mammalian cell interactions at the gut level are still obscure. Here, we report on the full structure of the LPS isolated from one of the prominent species of the genus Bacteroides, Bacteroides vulgatus. The LPS turned out to consist of a particular chemical structure based on hypoacylated and mono-phosphorylated lipid A and with a galactofuranose-containing core oligosaccharide and an O-antigen built up of mannose and rhamnose. The evaluation of the immunological properties of this LPS on human in vitro models revealed a very interesting capability to produce anti-inflammatory cytokines and to induce a synergistic action of MD-2/TLR4- and TLR2-mediated signaling pathways.F.D.L. acknowledges Progetto STAR 2018 Linea 1 grant E66C18001330003. S.M.S. acknowledges Spanish Ministry of Science (ref. CTQ2017-88353-R). A.M., F.D.L., and A.S.acknowledge H2020 Marie Skłodowska-Curie ITN 2018 “SweetCrossTalk” grant 814102. A.M. acknowledges progetto POR SATIN POR-FESR 2014−2 0 2 0 g r a n t B61C17000070007 (OR3) and Progetto POR Campania Oncoterapia 2014−2020 grant B61G18000470007. A.S. acknowledges PRIN-MIUR 2017 Glytunes project. A.S. and F.C. acknowledge COST (European Cooperation in Science and Technology) Action CA18103 (INNOGLY). F.C. was financially supported by the NWO Spinoza award of Y.K.Peer reviewe

    Observation of WWW Production in pp Collisions at √s = 13 TeV with the ATLAS Detector

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    This Letter reports the observation of W W W production and a measurement of its cross section using 139     fb − 1 of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. Events with two same-sign leptons (electrons or muons) and at least two jets, as well as events with three charged leptons, are selected. A multivariate technique is then used to discriminate between signal and background events. Events from W W W production are observed with a significance of 8.0 standard deviations, where the expectation is 5.4 standard deviations. The inclusive W W W production cross section is measured to be 820 ± 100   ( stat ) ± 80   ( syst )     fb , approximately 2.6 standard deviations from the predicted cross section of 511 ± 18     fb calculated at next-to-leading-order QCD and leading-order electroweak accuracy
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