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https://www.readbyqxmd.com/read/28919687/presence-and-characterization-of-escherichia-coli-virulence-genes-isolated-from-diseased-pigs-in-the-central-region-of-argentina
#1
Fernando A Bessone, Gabriela Bessone, Sebastián Marini, María B Conde, Fabrisio E Alustiza, Gustavo Zielinski
BACKGROUND: The main pathogen of neonatal and post weaning diarrhea and edema disease (ED) is Escherichia coli and pathotypes involved are enterotoxigenic, enteropathogenic, and shiga toxigenic (ETEC, EPEC, and STEC, respectively). Those diseases cause economic loss in pig production. AIM: The aim of this work was to evaluate the presence of strains expressing virulence markers genes and the antibiotic susceptibility profiles of E. coli from clinical cases of post weaning diarrhea and ED in farms in the central area of Argentina...
August 2017: Veterinary World
https://www.readbyqxmd.com/read/28906580/comparison-of-one-commercial-and-two-in-house-taqman-multiplex-real-time-pcr-assays-for-detection-of-enteropathogenic-enterotoxigenic-and-enteroaggregative-escherichia-coli
#2
Andreas Hahn, Marc Luetgehetmann, Olfert Landt, Norbert Georg Schwarz, Hagen Frickmann
OBJECTIVE: Enteropathogenic, enterotoxigenic, and enteroaggregative Escherichia coli (EPEC, ETEC, EAEC) are among the most frequent causes of diarrhea during travel or on military deployments. Cost efficient and reliable real-time multiplex PCR (mPCR) assays are desirable for surveillance or point prevalence studies in remote and resource-limited tropical settings. We compared one commercial PCR kit and two in-house assays without using a gold standard to estimate sensitivity and specificity of each assay...
September 14, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28904264/zoonotic-potential-and-antibiotic-resistance-of-escherichia-coli-in-neonatal-calves-in-uruguay
#3
Ana Umpiérrez, Inés Bado, Martín Oliver, Sofía Acquistapace, Analía Etcheverría, Nora Lía Padola, Rafael Vignoli, Pablo Zunino
Escherichia coli is one of the main etiological agents of neonatal calf diarrhea (NCD). The objective of this study was to assess the presence of virulence genes, genetic diversity, and antibiotic resistance mechanisms in E. coli associated with NCD in Uruguay. PCR was used to assess the presence of intimin, Shiga-like toxin, and stable and labile enterotoxin genes. Resistance to fluoroquinolones and oxyimino-cephalosporins was estimated on Müller-Hinton agar plates. Further antibiotic disc-diffusion tests were performed to assess bacterial multi-resistance...
September 12, 2017: Microbes and Environments
https://www.readbyqxmd.com/read/28887208/proteomic-comparison-of-three-clinical-diarrhoeagenic-drug-resistant-escherichia-coli-isolates-grown-on-chromagar%C3%A2-stec-media
#4
John Bosco Kalule, Suereta Fortuin, Bridget Calder, Lourens Robberts, Karen H Keddy, Andrew Nel, Shaun Garnett, Mark Nicol, Digby F Warner, Nelson C Soares, Jonathan M Blackburn
Shiga-toxin-producing Escherichia coli (STEC) and enteropathogenic Escherichia coli (EPEC) are key diarrhoea-causing foodborne pathogens. We used proteomics to characterize the virulence and antimicrobial resistance protein profiles of three clinical pathogenic E. coli isolates (two EPEC [one resistant to ciprofloxacin] and one STEC) cultured on CHROMagar™STEC solid media after minimal laboratory passage. We identified 4767 unique peptides from 1630 protein group across all three clinical E. coli strains...
September 5, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28862189/typical-atypical-enteropathogenic-escherichia-coli-in-diarrhoea-their-role-as-carrier-in-children-under-five
#5
Taru Singh, Shukla Das, V G Ramachandran, Dheeraj Shah, Rumpa Saha, Sajad Ahmad Dar, Arvind Rai
BACKGROUND & OBJECTIVES: Multidrug-resistant enteropathogenic Escherichia coli (EPEC) is responsible for a large number of cases of infantile diarrhoea in developing countries, causing failure in treatment with consequent health burden and resulting in a large number of deaths every year. This study was undertaken to determine the proportion of typical and atypical EPEC in under five children with diarrhoea and controls, their function as a carriage and to identify virulent genes associated with them...
April 2017: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/28860194/the-bacterial-arginine-glycosyltransferase-effector-nleb-preferentially-modifies-fas-associated-death-domain-protein-fadd
#6
Nichollas E Scott, Cristina Giogha, Georgina L Pollock, Catherine L Kennedy, Andrew I Webb, Nicholas A Williamson, Jaclyn S Pearson, Elizabeth L Hartland
The inhibition of host innate immunity pathways is essential for the persistence of attaching and effacing (A/E) pathogens such as enteropathogenic Escherichia coli (EPEC) and Citrobacter rodentium during mammalian infections. To subvert these pathways and suppress the antimicrobial response, A/E pathogens use type III secretion systems (T3SS) to introduce effectors targeting key signaling pathways in host cells. One such effector is the arginine glycosyltransferase NleB1 (NleBCR in C. rodentium) that modifies conserved arginine residues in death domain-containing host proteins with N-acetylglucosamine (GlcNAc), thereby blocking extrinsic apoptosis signaling...
August 31, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28840936/effects-of-static-magnetic-fields-on-the-enteropathogenic-escherichia-coli
#7
María A Quiñones-Peña, Gustavo Tavizon, José L Puente, Claudia Martínez-Anaya, Ulises Hernández-Chiñas, Carlos A Eslava
This study reports the effects of exposing cells of the prototypical enteropathogenic Escherichia coli (EPEC) strain E2348/69 to static magnetic fields (SMF) of varying intensities to observe their capacity to autoaggregate and the effect on cell adherence. The results showed that bacteria exposure over the course of 5 min to an intensity of 53 mT reduced autoaggregation by 28%. However, with intensities of up to 100 mT with the same exposure time, bacteria autoaggregation was reduced by approximately 50%; and after 30 min at the same intensity, it was indistinguishable from that observed in a non-autoaggregative strain...
August 25, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28829909/novel-multiplex-pcr-for-detection-of-diarrheagenic-escherichia-coli-strains-isolated-from-stool-and-water-samples
#8
J W Vendruscolo, T L Waldrich, G I A Saikawa, J S Pelayo, R K T Kobayashi, G Nakazato, S P D Rocha
Diarrhea is considered the second most common cause of infant mortality worldwide. The disease can be caused by many different pathogens, including diarrheagenic Escherichia coli (DEC), which includes the pathotypes enterotoxigenic E. coli (ETEC), enteroinvasive E. coli (EIEC), enteroaggregative E. coli (EAEC), Shiga toxin-producing E. coli (STEC), and enteropathogenic E. coli (EPEC). To develop a multiplex PCR system for the safe and accurate identification of the five main pathotypes of DEC, seven pairs of primers were determined for the following genes: aaiC, escV, bfpA, ipaH, elt, stx1, and stx2...
August 17, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28800816/an-investigation-of-vtx2-bacteriophage-transduction-to-different-escherichia-coli-patho-groups-in-food-matrices-and-nutrient-broth
#9
Sepo Nyambe, Catherine Burgess, Paul Whyte, Declan Bolton
This study investigated bacteriophage (phage) mediated transfer of the vtx2 gene from a donor Escherichia coli (C600φ3538(Δvtx2::cat)) to enteropathogenic (EPEC), enterotoxigenic (ETEC), enteroaggregative (EAEC), enteroinvasive (EIEC) and diffusely adherent (DAEC) E. coli strains in LB broth, milk, ground beef and lettuce. Two bacterial concentrations for both the E. coli donor and recipient strains, 3 and 5 log10 CFU/ml (LB broth and milk)/g (beef) or/cm(2) (lettuce), were used. When transductants were obtained, the location of insertion of the phage (insertion sites wrbA, yehA, sbcB, yecE and/or Z2577) in the E...
December 2017: Food Microbiology
https://www.readbyqxmd.com/read/28790204/bacterial-chromatin-structural-proteins-regulate-the-bimodal-expression-of-the-locus-of-enterocyte-effacement-lee-pathogenicity-island-in-enteropathogenic-escherichia-coli
#10
Hervé Leh, Ahmad Khodr, Marie-Christine Bouger, Bianca Sclavi, Sylvie Rimsky, Stéphanie Bury-Moné
In enteropathogenic Escherichia coli (EPEC), the locus of enterocyte effacement (LEE) encodes a type 3 secretion system (T3SS) essential for pathogenesis. This pathogenicity island comprises five major operons (LEE1 to LEE5), with the LEE5 operon encoding T3SS effectors involved in the intimate adherence of bacteria to enterocytes. The first operon, LEE1, encodes Ler (LEE-encoded regulator), an H-NS (nucleoid structuring protein) paralog that alleviates the LEE H-NS silencing. We observed that the LEE5 and LEE1 promoters present a bimodal expression pattern, depending on environmental stimuli...
August 8, 2017: MBio
https://www.readbyqxmd.com/read/28771584/extracellular-motility-and-cell-to-cell-transmission-of-enterohemorrhagic-e-coli-is-driven-by-espfu-mediated-actin-assembly
#11
Katrina B Velle, Kenneth G Campellone
Enteropathogenic and enterohemorrhagic Escherichia coli (EPEC and EHEC) are closely-related pathogens that attach tightly to intestinal epithelial cells, efface microvilli, and promote cytoskeletal rearrangements into protrusions called actin pedestals. To trigger pedestal formation, EPEC employs the tyrosine phosphorylated transmembrane receptor Tir, while EHEC relies on the multivalent scaffolding protein EspFU. The ability to generate these structures correlates with bacterial colonization in several animal models, but the precise function of pedestals in infection remains unclear...
August 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28771130/indigenous-lactobacilli-strains-of-food-and-human-sources-reverse-enteropathogenic-e-coli-o26-h11-induced-damage-in-intestinal-epithelial-cell-lines-effect-on-redistribution-of-tight-junction-proteins
#12
Ruchi Jariwala, Hemanti Mandal, Tamishraha Bagchi
The aim of the study was to investigate the neutralizing effect of lactobacilli isolated from indigenous food and human sources on enteropathogenic Escherichia coli (EPEC) O26 : H11-induced epithelial barrier dysfunction in vitro. This was assessed by transepithelial electrical resistance (TEER) and permeability assays using intestinal cell lines, HT-29 and Caco-2. Furthermore, the expression and distribution of tight junction (TJ) proteins were analysed by qRT-PCR and immunofluorescence assay, respectively...
August 4, 2017: Microbiology
https://www.readbyqxmd.com/read/28770906/pathovar-transcriptomes
#13
COMMENT
Amy Platenkamp, Jay L Mellies
Archetypal pathogenic bacterial strains are often used to elucidate regulatory networks of an entire pathovar, which encompasses multiple lineages and phylogroups. With enteropathogenic Escherichia coli (EPEC) as a model system, Hazen and colleagues (mSystems 6:e00024-17, 2017, https://doi.org/10.1128/mSystems.00024-17) used 9 isolates representing 8 lineages and 3 phylogroups to find that isolates with similar genomic sequences exhibit similarities in global transcriptomes under conditions of growth in medium that induces virulence gene expression...
July 2017: MSystems
https://www.readbyqxmd.com/read/28766584/transcriptional-variation-of-diverse-enteropathogenic-escherichia-coli-isolates-under-virulence-inducing-conditions
#14
Tracy H Hazen, Sean C Daugherty, Amol C Shetty, James P Nataro, David A Rasko
Enteropathogenic Escherichia coli (EPEC) bacteria are a diverse group of pathogens that cause moderate to severe diarrhea in young children in developing countries. EPEC isolates can be further subclassified as typical EPEC (tEPEC) isolates that contain the bundle-forming pilus (BFP) or as atypical EPEC (aEPEC) isolates that do not contain BFP. Comparative genomics studies have recently highlighted the considerable genomic diversity among EPEC isolates. In the current study, we used RNA sequencing (RNA-Seq) to characterize the global transcriptomes of eight tEPEC isolates representing the identified genomic diversity, as well as one aEPEC isolate...
July 2017: MSystems
https://www.readbyqxmd.com/read/28765695/effect-of-epec-endotoxin-and-bifidobacteria-on-intestinal-barrier-function-through-modulation-of-toll-like-receptor-2-and-toll-like-receptor-4-expression-in-intestinal-epithelial-cell-18
#15
Xia Yang, Xian-Chun Gao, Jun Liu, Hong-Yu Ren
AIM: To investigate toll-like receptor 2 (TLR2) and TLR4 expression, following bifidobacteria and low-dose EPEC endotoxin treatment, and intestinal barrier function in rat intestinal epithelial cell18 (IEC18). METHODS: Six experimental groups were established - normal control, EPEC, Bifidobacteria infantis (B. infantis), B. longum, B. bifidum, and B. youth groups. Optimal EPEC endotoxin concentration, bifidobacteria fold dilution, and treatment duration were determined...
July 14, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28757042/occurrence-and-characterization-of-stx-and-or-eae-positive-escherichia-coli-isolated-from-wildlife-including-a-typical-epec-strain-from-a-wild-boar
#16
Carla Andrea Alonso, Azucena Mora, Dafne Díaz, Miguel Blanco, David González-Barrio, Francisco Ruiz-Fons, Carmen Simón, Jorge Blanco, Carmen Torres
Shiga toxin-producing E. coli (STEC) and enteropathogenic E. coli (EPEC) strains are food-borne pathogens associated with acute diarrhea. Haemolytic-uremic syndrome (HUS) is often a complication of STEC infection. In order to examine the occurrence, serotypes, virulence and antimicrobial-resistance profiles of STEC and EPEC in wildlife, 326 faecal E. coli strains from 304 clinically healthy animals were analyzed. For this approach stx1, stx2 and eae genes, as well as accessory virulence determinants (ehx, hlyA, saa, tia, bfp, subAB) were PCR-screened and sequenced...
August 2017: Veterinary Microbiology
https://www.readbyqxmd.com/read/28700648/highly-diverse-and-antimicrobial-susceptible-escherichia-coli-display-a-na%C3%A3-ve-bacterial-population-in-fruit-bats-from-the-republic-of-congo
#17
Kathrin Nowak, Jakob Fahr, Natalie Weber, Antina Lübke-Becker, Torsten Semmler, Sabrina Weiss, Jean-Vivien Mombouli, Lothar H Wieler, Sebastian Guenther, Fabian H Leendertz, Christa Ewers
Bats are suspected to be a reservoir of several bacterial and viral pathogens relevant to animal and human health, but studies on Escherichia coli in these animals are sparse. We investigated the presence of E. coli in tissue samples (liver, lung and intestines) collected from 50 fruit bats of five different species (Eidolon helvum, Epomops franqueti, Hypsignathus monstrosus, Myonycteris torquata, Rousettus aegyptiacus) of two different areas in the Republic of Congo between 2009 and 2010. To assess E. coli pathotypes and phylogenetic relationships, we determined the presence of 59 virulence associated genes and multilocus sequence types (STs)...
2017: PloS One
https://www.readbyqxmd.com/read/28694292/specialized-pro-resolving-mediators-spm-rescue-infant-mice-from-lethal-citrobacter-rodentium-infection-and-promote-immunity-against-re-infection
#18
Luis Alonso Diaz, Norman H Altman, Wasif Khan, Charles N Serhan, Becky Adkins
Infants are generally highly susceptible to oral pathogens. Intestinal infection and the associated diarrhea are significant global causes of morbidity and mortality in infants. Among the enteric pathogens, enteropathogenic E. coli (EPEC) stands out as showing the highest risk for infection-induced death in infants ≤ 12 months old. We have developed an experimental model of infant infection with EPEC, using the murine specific pathogen Citrobacter rodentium Our murine infant model is similar to EPEC infection in human infants since infant mice are much more susceptible to C...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28693504/prevalence-of-multi-drug-resistant-enteropathogenic-and-enteroinvasive-escherichia-coli-isolated-from-children-with-and-without-diarrhea-in-northeast-indian-population
#19
Karuppasamy Chellapandi, Tapan Kumar Dutta, Indu Sharma, Surajit De Mandal, Nachimuthu Senthil Kumar, Lalsanglura Ralte
BACKGROUND: Diarrheagenic Escherichia coli are associated with infantile diarrhea in the developing countries. The present study was conducted to determine the occurrence and antimicrobial resistance pattern of enteropathogenic and enteroinvasive E. coli associated with diarrhoea among the paediatric patients. METHODS: A total of 262 stool samples were collected from children with and without diarrhea from Mizoram, Northeast India. E. coli were isolated and subjected to multiplex PCR to detect virulent genes of EPEC (eaeA and bfpA) and EIEC (ial)...
July 11, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28687945/extraction-of-lactobacillus-acidophilus-cicc-6074-s-layer-proteins-and-their-ability-to-inhibit-enteropathogenic-escherichia-coli
#20
Jinye Zhang, Jinjin Gao, Yuxing Guo, Zhen Wu, Daodong Pan
An adhesion-related protein of Lactobacillus acidophilus strain CICC 6074 involved in binding to Caco-2 cells and inhibiting Enteropathogenic Escherichia coli (EPEC) was isolated and characterized. The S-layer protein was extracted with 5M LiCl and the active fraction purified by gel filtration (G-75). The S-layer protein was visualized by SDS-PAGE and characterized by estimating the relative molecular weight using mass spectra. The inhibitory effect of L. acidophilus and its S-layer proteins on the ability of EPEC to adhere to cells was explored by using a Caco-2 cell model...
July 7, 2017: Current Microbiology
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