224 results found
Ale A, Crepin VF, Collins JW, et al., 2017, Model of Host-Pathogen Interaction Dynamics Links In Vivo Optical Imaging and Immune Responses, INFECTION AND IMMUNITY, Vol: 85, ISSN: 0019-9567
Berger CN, Crepin VF, Roumeliotis TI, et al., 2017, Citrobacter rodentium Subverts ATP Flux and Cholesterol Homeostasis in Intestinal Epithelial Cells In Vivo, CELL METABOLISM, Vol: 26, Pages: 738-+, ISSN: 1550-4131
Cepeda-Molero M, Berger CN, Walsham ADS, et al., 2017, Attaching and effacing (A/E) lesion formation by enteropathogenic E. coli on human intestinal mucosa is dependent on non-LEE effectors, PLOS PATHOGENS, Vol: 13, ISSN: 1553-7366
Johnson R, Byrne A, Berger CN, et al., 2017, The Type III Secretion System Effector SptP of Salmonella enterica Serovar Typhi, JOURNAL OF BACTERIOLOGY, Vol: 199, ISSN: 0021-9193
Johnson R, Ravenhall M, Pickard D, et al., 2017, Comparison of Salmonella enterica serovars Typhi and Typhimurium reveals typhoidal-specific responses to bile., Infect Immun
Salmonella enterica serovars Typhi and Typhimurium cause typhoid fever and gastroenteritis respectively. A unique feature of typhoid infection is asymptomatic carriage within the gallbladder, which is linked with S Typhi transmission. Despite this, S Typhi responses to bile have been poorly studied. RNA-Seq of S Typhi Ty2 and a clinical S Typhi isolate belonging to the globally dominant H58 lineage (129-0238), as well as S Typhimurium 14028, revealed that 249, 389 and 453 genes respectively were differentially expressed in the presence of 3% bile compared to control cultures lacking bile. fad genes, the actP-acs operon, and putative sialic acid uptake and metabolism genes (t1787-t1790) were upregulated in all strains following bile exposure, which may represent adaptation to the small intestine environment. Genes within the Salmonella pathogenicity island 1 (SPI-1), encoding a type IIII secretion system (T3SS), and motility genes were significantly upregulated in both S Typhi strains in bile, but downregulated in S Typhimurium. Western blots of the SPI-1 proteins SipC, SipD, SopB and SopE validated the gene expression data. Consistent with this, bile significantly increased S Typhi HeLa cell invasion whilst S Typhimurium invasion was significantly repressed. Protein stability assays demonstrated that in S Typhi the half-life of HilD, the dominant regulator of SPI-1, is three times longer in the presence of bile; this increase in stability was independent of the acetyltransferase Pat. Overall, we found that S Typhi exhibits a specific response to bile, especially with regards to virulence gene expression, which could impact pathogenesis and transmission.
Pallett MA, Crepin VF, Serafini N, et al., 2017, Bacterial virulence factor inhibits caspase-4/11 activation in intestinal epithelial cells, MUCOSAL IMMUNOLOGY, Vol: 10, Pages: 602-612, ISSN: 1933-0219
Pearson JS, Giogha C, Muhlen S, et al., 2017, EspL is a bacterial cysteine protease effector that cleaves RHIM proteins to block necroptosis and inflammation, NATURE MICROBIOLOGY, Vol: 2, ISSN: 2058-5276
Portaliou AG, Tsolis KC, Loos MS, et al., 2017, Hierarchical protein targeting and secretion is controlled by an affinity switch in the type III secretion system of enteropathogenic Escherichia coli., EMBO J, Vol: 36, Pages: 3517-3531
Type III secretion (T3S), a protein export pathway common to Gram-negative pathogens, comprises a trans-envelope syringe, the injectisome, with a cytoplasm-facing translocase channel. Exported substrates are chaperone-delivered to the translocase, EscV in enteropathogenic Escherichia coli, and cross it in strict hierarchical manner, for example, first "translocators", then "effectors". We dissected T3S substrate targeting and hierarchical switching by reconstituting them in vitro using inverted inner membrane vesicles. EscV recruits and conformationally activates the tightly membrane-associated pseudo-effector SepL and its chaperone SepD. This renders SepL a high-affinity receptor for translocator/chaperone pairs, recognizing specific chaperone signals. In a second, SepD-coupled step, translocators docked on SepL become secreted. During translocator secretion, SepL/SepD suppress effector/chaperone binding to EscV and prevent premature effector secretion. Disengagement of the SepL/SepD switch directs EscV to dedicated effector export. These findings advance molecular understanding of T3S and reveal a novel mechanism for hierarchical trafficking regulation in protein secretion channels.
Sandu P, Crepin VF, Drechsler H, et al., 2017, The Enterohemorrhagic Escherichia coli Effector EspW Triggers Actin Remodeling in a Rac1-Dependent Manner, INFECTION AND IMMUNITY, Vol: 85, ISSN: 0019-9567
Witcomb LA, Czupryna J, Francis KP, et al., 2017, Non-invasive three-dimensional imaging of Escherichia coli K1 infection using diffuse light imaging tomography combined with micro-computed tomography, METHODS, Vol: 127, Pages: 62-68, ISSN: 1046-2023
Crepin VF, Collins JW, Habibzay M, et al., 2016, Citrobacter rodentium mouse model of bacterial infection., Nat Protoc, Vol: 11, Pages: 1851-1876
Infection of mice with Citrobacter rodentium is a robust model to study bacterial pathogenesis, mucosal immunology, the health benefits of probiotics and the role of the microbiota during infection. C. rodentium was first isolated by Barthold from an outbreak of mouse diarrhea in Yale University in 1972 and was 'rediscovered' by Falkow and Schauer in 1993. Since then the use of the model has proliferated, and it is now the gold standard for studying virulence of the closely related human pathogens enteropathogenic and enterohemorrhagic Escherichia coli (EPEC and EHEC, respectively). Here we provide a detailed protocol for various applications of the model, including bacterial growth, site-directed mutagenesis, mouse inoculation (from cultured cells and after cohabitation), monitoring of bacterial colonization, tissue extraction and analysis, immune responses, probiotic treatment and microbiota analysis. The main protocol, from mouse infection to clearance and analysis of tissues and host responses, takes ∼5 weeks to complete.
Furniss RCD, Slater S, Frankel G, et al., 2016, Enterohaemorrhagic E. coli modulates an ARF6:Rab35 signaling axis to prevent recycling endosome maturation during infection, JOURNAL OF MOLECULAR BIOLOGY, Vol: 428, Pages: 3399-3407, ISSN: 0022-2836
Pollard DJ, Young JC, Covarelli V, et al., 2016, The Type III Secretion System Effector SeoC of Salmonella enterica subsp salamae and S. enterica subsp arizonae ADP-Ribosylates Src and Inhibits Opsonophagocytosis, INFECTION AND IMMUNITY, Vol: 84, Pages: 3618-3628, ISSN: 0019-9567
So EC, Schroeder GN, Carson D, et al., 2016, The Rab-binding Profiles of Bacterial Virulence Factors during Infection, JOURNAL OF BIOLOGICAL CHEMISTRY, Vol: 291, Pages: 5832-5843, ISSN: 0021-9258
Crepin VF, Habibzay M, Glegola-Madejska I, et al., 2015, Tir Triggers Expression of CXCL1 in Enterocytes and Neutrophil Recruitment during Citrobacter rodentium Infection, INFECTION AND IMMUNITY, Vol: 83, Pages: 3342-3354, ISSN: 0019-9567
Hunter PJ, Shaw RK, Berger CN, et al., 2015, Older leaves of lettuce (Lactuca spp.) support higher levels of Salmonella enterica ser. Senftenberg attachment and show greater variation between plant accessions than do younger leaves, FEMS MICROBIOLOGY LETTERS, Vol: 362, ISSN: 0378-1097
Messens W, Bolton D, Frankel G, et al., 2015, Defining pathogenic verocytotoxin-producing Escherichia coli (VTEC) from cases of human infection in the European Union, 2007-2010, EPIDEMIOLOGY AND INFECTION, Vol: 143, Pages: 1652-1661, ISSN: 0950-2688
Schreiber F, Kay S, Frankel G, et al., 2015, The Hd, Hj, and Hz66 flagella variants of Salmonella enterica serovar Typhi modify host responses and cellular interactions, SCIENTIFIC REPORTS, Vol: 5, ISSN: 2045-2322
Schroeder GN, Aurass P, Oates CV, et al., 2015, Legionella pneumophila Effector LpdA Is a Palmitoylated Phospholipase D Virulence Factor, INFECTION AND IMMUNITY, Vol: 83, Pages: 3989-4002, ISSN: 0019-9567
So EC, Mattheis C, Tate EW, et al., 2015, Creating a customized intracellular niche: subversion of host cell signaling by Legionella type IV secretion system effectors, CANADIAN JOURNAL OF MICROBIOLOGY, Vol: 61, Pages: 617-635, ISSN: 0008-4166
Witcomb LA, Collins JW, McCarthy AJ, et al., 2015, Bioluminescent Imaging Reveals Novel Patterns of Colonization and Invasion in Systemic Escherichia coli K1 Experimental Infection in the Neonatal Rat, INFECTION AND IMMUNITY, Vol: 83, Pages: 4528-4540, ISSN: 0019-9567
Clements A, Stoneham CA, Furniss RCD, et al., 2014, Enterohaemorrhagic Escherichia coli inhibits recycling endosome function and trafficking of surface receptors, CELLULAR MICROBIOLOGY, Vol: 16, Pages: 1693-1705, ISSN: 1462-5814
Collins JW, Chervaux C, Raymond B, et al., 2014, Fermented Dairy Products Modulate Citrobacter rodentium-Induced Colonic Hyperplasia, JOURNAL OF INFECTIOUS DISEASES, Vol: 210, Pages: 1029-1041, ISSN: 0022-1899
Collins JW, Keeney KM, Crepin VE, et al., 2014, Citrobacter rodentium: infection, inflammation and the microbiota, NATURE REVIEWS MICROBIOLOGY, Vol: 12, Pages: 612-623, ISSN: 1740-1526
Mousnier A, Schroeder GN, Stoneham CA, et al., 2014, A New Method To Determine In Vivo Interactomes Reveals Binding of the Legionella pneumophila Effector PieE to Multiple Rab GTPases, MBIO, Vol: 5, ISSN: 2150-7511
Pallett MA, Berger CN, Pearson JS, et al., 2014, The Type III Secretion Effector NleF of Enteropathogenic Escherichia coli Activates NF-kappa B Early during Infection, INFECTION AND IMMUNITY, Vol: 82, Pages: 4878-4888, ISSN: 0019-9567
Satoh-Takayama N, Serafini N, Verrier T, et al., 2014, The Chemokine Receptor CXCR6 Controls the Functional Topography of Interleukin-22 Producing Intestinal Innate Lymphoid Cells, IMMUNITY, Vol: 41, Pages: 776-788, ISSN: 1074-7613
Song-Zhao GX, Srinivasan N, Pott J, et al., 2014, Nlrp3 activation in the intestinal epithelium protects against a mucosal pathogen, MUCOSAL IMMUNOLOGY, Vol: 7, Pages: 763-774, ISSN: 1933-0219
Stevens MP, Frankel GM, 2014, The Locus of Enterocyte Effacement and Associated Virulence Factors of Enterohemorrhagic Escherichia coli., Microbiol Spectr, Vol: 2
A subset of Shiga toxin-producing Escherichia coli strains, termed enterohemorrhagic E. coli (EHEC), is defined in part by the ability to produce attaching and effacing (A/E) lesions on intestinal epithelia. Such lesions are characterized by intimate bacterial attachment to the apical surface of enterocytes, cytoskeletal rearrangements beneath adherent bacteria, and destruction of proximal microvilli. A/E lesion formation requires the locus of enterocyte effacement (LEE), which encodes a Type III secretion system that injects bacterial proteins into host cells. The translocated proteins, termed effectors, subvert a plethora of cellular pathways to the benefit of the pathogen, for example, by recruiting cytoskeletal proteins, disrupting epithelial barrier integrity, and interfering with the induction of inflammation, phagocytosis, and apoptosis. The LEE and selected effectors play pivotal roles in intestinal persistence and virulence of EHEC, and it is becoming clear that effectors may act in redundant, synergistic, and antagonistic ways during infection. Vaccines that target the function of the Type III secretion system limit colonization of reservoir hosts by EHEC and may thus aid control of zoonotic infections. Here we review the features and functions of the LEE-encoded Type III secretion system and associated effectors of E. coli O157:H7 and other Shiga toxin-producing E. coli strains.
Wlodarska M, Thaiss CA, Nowarski R, et al., 2014, NLRP6 Inflammasome Orchestrates the Colonic Host-Microbial Interface by Regulating Goblet Cell Mucus Secretion, CELL, Vol: 156, Pages: 1045-1059, ISSN: 0092-8674
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