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https://www.readbyqxmd.com/read/28445131/therapeutic-benefit-of-salmonella-attributed-to-lps-and-tnf-%C3%AE-is-exhaustible-and-dictated-by-tumor-susceptibility
#1
Dino Kocijancic, Sara Leschner, Sebastian Felgner, Ronja-Melinda Komoll, Michael Frahm, Vinay Pawar, Siegfried Weiss
The potential of bacteria-mediated tumor therapy (BMTT) is highlighted by more than a century of investigation. Attenuated Salmonella has prevailed as promising therapeutic agents. For BMTT - categorized as an immune therapy - the exact contribution of particular immune reactions to the therapeutic effect remains ambiguous. In addition, one could argue for or against the requirement of bacterial viability and tumor targeting. Herein we evaluate the isolated therapeutic efficacy of purified LPS and TNF-α, which together account for a dominant immunogenic pathway of gram negative bacteria like Salmonella...
April 6, 2017: Oncotarget
https://www.readbyqxmd.com/read/28439039/invs-coordinates-expression-of-prgh-and-fimz-and-is-required-for-invasion-of-epithelial-cells-by-salmonella-enterica-serovar-typhimurium
#2
Lu Wang, Xia Cai, Shuyan Wu, Rajdeep Bomjan, Ernesto S Nakayasu, Kristian Händler, Jay C D Hinton, Daoguo Zhou
Deep sequencing has revolutionized our understanding of the bacterial RNA world, and has facilitated the identification of 280 sRNAs in Salmonella Despite suspicions that sRNAs may play important roles in Salmonella pathogenesis, the functions of most sRNAs remain unknown. To advance our understanding of RNA biology in Salmonella virulence, we searched for sRNAs required for bacterial invasion into non-phagocytic cells. After screening 75 sRNAs, we discovered that ablation of InvS caused a significant decrease of Salmonella invasion into epithelial cells...
April 24, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28437624/immune-response-to-salmonella-infections-in-vaccinated-and-non-vaccinated-turkeys
#3
Martina Hesse, Andreas Stamm, Angela Berndt, Gerhard Glünder, Rita Weber
Vaccination has been widely used to reduce the Salmonella burden in poultry and subsequently the transmission to humans. Concerning turkey, there is little knowledge on the immune response to colonization and invasion by Salmonella species or about efficacy of vaccination and involved immune mechanisms. In the present study, turkeys were vaccinated at the day of hatch and infected with Salmonella Typhimurium (ST) or Enteritidis (SE) field strains three weeks later. A control group was kept uninfected. After challenge infection, bacterial counts in the cecal content, liver and spleen were determined 7 and 14days post infection...
April 6, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28437229/quinolone-resistance-determinants-of-clinical-salmonella-enteritidis-in-thailand
#4
Fuangfa Utrarachkij, Chie Nakajima, Ruchirada Changkwanyeun, Kanokrat Siripanichgon, Siriporn Kongsoi, Srirat Pornruangwong, Kanjana Changkaew, Risa Tsunoda, Yutaka Tamura, Orasa Suthienkul, Yasuhiko Suzuki
Salmonella Enteritidis has emerged as a global concern regarding quinolone resistance and invasive potential. Although quinolone-resistant S. Enteritidis has been observed with high frequency in Thailand, information on the mechanism of resistance acquisition is limited. To elucidate the mechanism, a total of 158 clinical isolates of nalidixic acid (NAL)-resistant S. Enteritidis were collected throughout Thailand, and the quinolone resistance determinants were investigated in the context of resistance levels to NAL, norfloxacin (NOR), and ciprofloxacin (CIP)...
February 23, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28426838/a-second-wave-of-salmonella-t3ss1-activity-prolongs-the-lifespan-of-infected-epithelial-cells
#5
Ciaran E Finn, Audrey Chong, Kendal G Cooper, Tregei Starr, Olivia Steele-Mortimer
Type III secretion system 1 (T3SS1) is used by the enteropathogen Salmonella enterica serovar Typhimurium to establish infection in the gut. Effector proteins translocated by this system across the plasma membrane facilitate invasion of intestinal epithelial cells. One such effector, the inositol phosphatase SopB, contributes to invasion and mediates activation of the pro-survival kinase Akt. Following internalization, some bacteria escape from the Salmonella-containing vacuole into the cytosol and there is evidence suggesting that T3SS1 is expressed in this subpopulation...
April 20, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28426789/gre-factors-mediated-control-of-hild-transcription-is-essential-for-the-invasion-of-epithelial-cells-by-salmonella-enterica-serovar-typhimurium
#6
Tania Gaviria-Cantin, Youssef El Mouali, Soazig Le Guyon, Ute Römling, Carlos Balsalobre
The invasion of epithelial cells by Salmonella enterica serovar Typhimurium is a very tightly regulated process. Signaling cascades triggered by different environmental and physiological signals converge to control HilD, an AraC regulator that coordinates the expression of several virulence factors. The expression of hilD is modulated at several steps of the expression process. Here, we report that the invasion of epithelial cells by S. Typhimurium strains lacking the Gre factors, GreA and GreB, is impaired...
April 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28421074/immunometabolic-phenotype-alterations-associated-with-the-induction-of-disease-tolerance-and-persistent-asymptomatic-infection-of-salmonella-in-the-chicken-intestine
#7
REVIEW
Michael H Kogut, Ryan J Arsenault
The adaptation of Salmonella enterica to the eukaryotic host is a key process that enables the bacterium to survive in a hostile environment. Salmonella have evolved an intimate relationship with its host that extends to their cellular and molecular levels. Colonization, invasion, and replication of the bacteria in an appropriate host suggest that modification of host functions is central to pathogenesis. Intuitively, this subversion of the cell must be a complex process, since hosts are not inherently programmed to provide an environment conducive to pathogens...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28413046/heat-stress-decreases-expression-of-the-cytokines-avian-%C3%AE-defensins-4-and-6-and-toll-like-receptor-2-in-broiler-chickens-infected-with-salmonella-enteritidis
#8
W M Quinteiro-Filho, A S Calefi, D S G Cruz, T P A Aloia, A Zager, C S Astolfi-Ferreira, J A Piantino Ferreira, S Sharif, J Palermo-Neto
A high ambient temperature is a highly relevant stressor in poultry production. Heat stress (HS) has been reported to reduce animal welfare, performance indices and increase Salmonella susceptibility. Salmonella spp. are major zoonotic pathogen that cause over 1 billion of human infections worldwide annually. Therefore, the current study was designed to analyze the effect of heat stress on Salmonella infection in chickens through modulation of the immune responses. Salmonella Enteritidis was inoculated via gavage at one day of age (10(6)cfu/mL)...
April 2017: Veterinary Immunology and Immunopathology
https://www.readbyqxmd.com/read/28410991/naip-nlrc4-inflammasomes-coordinate-intestinal-epithelial-cell-expulsion-with-eicosanoid-and-il-18-release-via-activation-of-caspase-1-and-8
#9
Isabella Rauch, Katherine A Deets, Daisy X Ji, Jakob von Moltke, Jeannette L Tenthorey, Angus Y Lee, Naomi H Philip, Janelle S Ayres, Igor E Brodsky, Karsten Gronert, Russell E Vance
Intestinal epithelial cells (IECs) form a critical barrier against pathogen invasion. By generation of mice in which inflammasome expression is restricted to IECs, we describe a coordinated epithelium-intrinsic inflammasome response in vivo. This response was sufficient to protect against Salmonella tissue invasion and involved a previously reported IEC expulsion that was coordinated with lipid mediator and cytokine production and lytic IEC death. Excessive inflammasome activation in IECs was sufficient to result in diarrhea and pathology...
April 18, 2017: Immunity
https://www.readbyqxmd.com/read/28405025/high-avidity-iga-protects-the-intestine-by-enchaining-growing-bacteria
#10
Kathrin Moor, Médéric Diard, Mikael E Sellin, Boas Felmy, Sandra Y Wotzka, Albulena Toska, Erik Bakkeren, Markus Arnoldini, Florence Bansept, Alma Dal Co, Tom Völler, Andrea Minola, Blanca Fernandez-Rodriguez, Gloria Agatic, Sonia Barbieri, Luca Piccoli, Costanza Casiraghi, Davide Corti, Antonio Lanzavecchia, Roland R Regoes, Claude Loverdo, Roman Stocker, Douglas R Brumley, Wolf-Dietrich Hardt, Emma Slack
Vaccine-induced high-avidity IgA can protect against bacterial enteropathogens by directly neutralizing virulence factors or by poorly defined mechanisms that physically impede bacterial interactions with the gut tissues ('immune exclusion'). IgA-mediated cross-linking clumps bacteria in the gut lumen and is critical for protection against infection by non-typhoidal Salmonella enterica subspecies enterica serovar Typhimurium (S. Typhimurium). However, classical agglutination, which was thought to drive this process, is efficient only at high pathogen densities (≥10(8) non-motile bacteria per gram)...
April 12, 2017: Nature
https://www.readbyqxmd.com/read/28400130/salmonella-typhimurium-induces-cloacitis-like-symptomsin-zebrafish-larvae
#11
Macarena Varas, Javiera Ortíz-Severín, Andrés E Marcoleta, Francisco Díaz-Pascual, Miguel L Allende, Carlos A Santiviago, Francisco P Chávez
Pathogenic Salmonella strains have a set of virulence factors allowing them to generate systemic infections and damage in a variety of hosts. Among these factors, bacterial proteins secreted by specialized systems are used to penetrate the host's intestinal mucosa, through the invasion and destruction of specialized epithelial M cells in the intestine. On the other hand, numerous studies have demonstrated that humans, as well as experimental animal hosts, respond to Salmonella infection by activating both innate and adaptive immune responses...
April 8, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28388624/development-of-a-glycoconjugate-vaccine-to-prevent-invasive-salmonella-typhimurium-infections-in-sub-saharan-africa
#12
Scott M Baliban, Mingjun Yang, Girish Ramachandran, Brittany Curtis, Surekha Shridhar, Rachel S Laufer, Jin Y Wang, John Van Druff, Ellen E Higginson, Nicolas Hegerle, Kristen M Varney, James E Galen, Sharon M Tennant, Andrew Lees, Alexander D MacKerell, Myron M Levine, Raphael Simon
Invasive infections associated with non-typhoidal Salmonella (NTS) serovars Enteritidis (SE), Typhimurium (STm) and monophasic variant 1,4,[5],12:i:- are a major health problem in infants and young children in sub-Saharan Africa, and currently, there are no approved human NTS vaccines. NTS O-polysaccharides and flagellin proteins are protective antigens in animal models of invasive NTS infection. Conjugates of SE core and O-polysaccharide (COPS) chemically linked to SE flagellin have enhanced the anti-COPS immune response and protected mice against fatal challenge with a Malian SE blood isolate...
April 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28381209/supplemental-invasion-of-salmonella-from-the-perspective-of-salmonella-enterica-serovars-kentucky-and-typhimurium
#13
Kevin Howe, Sanaz Salehi, R Hartford Bailey, John P Brooks, Robert Wills, Mark L Lawrence, Attila Karsi
BACKGROUND: Critical to the development of Salmonellosis in humans is the interaction of the bacterium with the epithelial lining of the gastrointestinal tract. Traditional scientific reasoning held type III secretion system (T3SS) as the virulence factor responsible for bacterial invasion. In this study, field-isolated Salmonella enterica serovar Kentucky and a known human pathogen Salmonella enterica serovar Typhimurium were mutated and evaluated for the invasion of human colorectal adenocarcinoma epithelial cells...
April 5, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28368463/enteric-helminths-promote-salmonella-co-infection-by-altering-the-intestinal-metabolome
#14
Lisa A Reynolds, Stephen A Redpath, Sophie Yurist-Doutsch, Navkiran Gill, Eric M Brown, Joris van der Heijden, Tara P Brosschot, Jun Han, Natalie C Marshall, Sarah E Woodward, Yanet Valdez, Christoph H Borchers, Georgia Perona-Wright, B Brett Finlay
Intestinal helminth infections occur predominantly in regions where exposure to enteric bacterial pathogens is also common. Helminth infections inhibit host immunity against microbial pathogens, which has largely been attributed to the induction of regulatory or type 2 (Th2) immune responses. Here we demonstrate an additional three-way interaction in which helminth infection alters the metabolic environment of the host intestine to enhance bacterial pathogenicity. We show that an ongoing helminth infection increased colonization by Salmonella independently of T regulatory or Th2 cells...
March 25, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28361036/a-salmonella-regulator-modulates-intestinal-colonization-and-use-of-phosphonoacetic-acid
#15
Johanna R Elfenbein, Leigh A Knodler, Allison R Schaeffer, Franziska Faber, Andreas J Bäumler, Helene L Andrews-Polymenis
Many microorganisms produce phosphonates, molecules characterized by stable carbon-phosphorus bonds that store phosphorus or act as antimicrobials. The role of phosphonates in the marine biosphere is well characterized but the role of these molecules in the intestine is poorly understood. Salmonella enterica uses its virulence factors to influence the host immune response to compete with the host and normal microflora for nutrients. Salmonella cannot produce phosphonates but encodes the enzymes to use them suggesting that it is exposed to phosphonates during its life cycle...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28358127/erratum-distinct-salmonella-enteritidis-lineages-associated-with-enterocolitis-in-high-income-settings-and-invasive-disease-in-low-income-settings
#16
Nicholas A Feasey, James Hadfield, Karen H Keddy, Timothy J Dallman, Jan Jacobs, Xiangyu Deng, Paul Wigley, Lars Barquist, Gemma C Langridge, Theresa Feltwell, Simon R Harris, Alison E Mather, Maria Fookes, Martin Aslett, Chisomo Msefula, Samuel Kariuki, Calman A Maclennan, Robert S Onsare, François-Xavier Weill, Simon Le Hello, Anthony M Smith, Michael McClelland, Prerak Desai, Christopher M Parry, John Cheesbrough, Neil French, Josefina Campos, Jose A Chabalgoity, Laura Betancor, Katie L Hopkins, Satheesh Nair, Tom J Humphrey, Octavie Lunguya, Tristan A Cogan, Milagritos D Tapia, Samba O Sow, Sharon M Tennant, Kristin Bornstein, Myron M Levine, Lizeth Lacharme-Lora, Dean B Everett, Robert A Kingsley, Julian Parkhill, Robert S Heyderman, Gordon Dougan, Melita A Gordon, Nicholas R Thomson
No abstract text is available yet for this article.
March 30, 2017: Nature Genetics
https://www.readbyqxmd.com/read/28355215/salmonella-genomic-island-1-sgi1-reshapes-the-mating-apparatus-of-incc-conjugative-plasmids-to-promote-self-propagation
#17
Nicolas Carraro, Romain Durand, Nicolas Rivard, Charley Anquetil, Catherine Barrette, Malika Humbert, Vincent Burrus
IncC conjugative plasmids and Salmonella genomic island 1 (SGI1) and relatives are frequently associated with multidrug resistance of clinical isolates of pathogenic Enterobacteriaceae. SGI1 is specifically mobilized in trans by IncA and IncC plasmids (commonly referred to as A/C plasmids) following its excision from the chromosome, an event triggered by the transcriptional activator complex AcaCD encoded by these helper plasmids. Although SGI1 is not self-transmissible, it carries three genes, traNS, traHS and traGS, coding for distant homologs of the predicted mating pore subunits TraNC, TraHC and TraGC, respectively, encoded by A/C plasmids...
March 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28353576/clinical-and-microbiological-features-of-invasive-nontyphoidal-salmonella-associated-with-hiv-infected-patients-gauteng-province-south-africa
#18
Karen H Keddy, Alfred Musekiwa, Arvinda Sooka, Alan Karstaedt, Trusha Nana, Sharona Seetharam, Maphoshane Nchabaleng, Ruth Lekalakala, Frederick J Angulo, Keith P Klugman
The aim of this study was to define factors associated with HIV-infected versus uninfected patients with invasive nontyphoidal Salmonella (iNTS) and factors associated with mortality, which are inadequately described in Africa.Laboratory-based surveillance for iNTS was undertaken. At selected sentinel sites, clinical data (age, sex, HIV status, severity of illness, and outcome) were collected.Surveillance was conducted in Gauteng, South Africa, from 2003 to 2013. Clinical and microbiological differences between HIV-infected and uninfected patients were defined and risk factors for mortality established...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28348208/myo6-is-targeted-by-salmonella-virulence-effectors-to-trigger-pi3-kinase-signaling-and-pathogen-invasion-into-host-cells
#19
Andrew B E Brooks, Daniel Humphreys, Vikash Singh, Anthony C Davidson, Susan D Arden, Folma Buss, Vassilis Koronakis
To establish infections, Salmonella injects virulence effectors that hijack the host actin cytoskeleton and phosphoinositide signaling to drive pathogen invasion. How effectors reprogram the cytoskeleton network remains unclear. By reconstituting the activities of the Salmonella effector SopE, we recapitulated Rho GTPase-driven actin polymerization at model phospholipid membrane bilayers in cell-free extracts and identified the network of Rho-recruited cytoskeleton proteins. Knockdown of network components revealed a key role for myosin VI (MYO6) in Salmonella invasion...
April 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28339832/effects-of-feeding-original-xpc%C3%A2-to-broilers-with-a-live-coccidiosis-vaccine-under-industrial-conditions-part-2-cecal-microbiota-analysis
#20
S H Park, S Roto, H Pavlidis, D McIntyre, K Striplin, L Brammer, S C Ricke
Biological supplements in poultry feed are of continued interest due to the improvements in growth performance, protection from pathogen invasion, and benefits in overall host health. The fermentation metabolites of Diamond V Original XPC™ (XPC) have previously been shown to improve commercial performance and reduce Salmonella in poultry. The current study sought to characterize the cecal microbiota using culture-independent analysis based on 16S rRNA gene in Coccivac-D sprayed broilers supplemented with XPC and/or Salinomycin (SAL)...
March 1, 2017: Poultry Science
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