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https://www.readbyqxmd.com/read/27916544/characterization-of-escherichia-coli-causing-community-acquired-urinary-tract-infections-in-mexico-city
#1
Laura Belmont-Monroy, Rosa María Ribas-Aparicio, Armando Navarro-Ocaña, H Ángel Manjarrez-Hernández, Sandra Gavilanes-Parra, Gerardo Aparicio-Ozores, Patricia Isidra Cauich-Sánchez, Ulises Garza-Ramos, José Molina-López
The O25-ST131 clone was identified within 169 uropathogenic Escherichia coli (UPEC) strains. The 44.8% of the 29 O25-ST131 clones detected were positive to least to one extended-spectrum β-lactamase gene. The phylogroup D was mainly found. The O25-ST131 clone appeared to be associated with community-acquired UTI in Mexico City.
November 14, 2016: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/27902433/escherichia-coli-clonal-group-a-cga-among-uropathogenic-infections-in-mexico-city
#2
Angel Manjarrez-Hernandez, José Molina-López, Sandra Gavilanes-Parra, Rigoberto Hernandez-Castro
Escherichia coli clonal group A (CGA) causes urinary tract and other extraintestinal infections in humans. CGA is an important cause of trimethoprim/sulfamethoxazole (SXT)-resistance in extraintestinal pathogens. We examined the extent to which resistance in this area is related to CGA dissemination of E. coli from urinary tract infections (UTIs) in Mexico City. The virulence backgrounds of the isolates were also characterized. In this study, the frequency of resistance to SXT used for UTI treatment was high (56-65%) and CGA isolates accounted for 9 of the 78 SXT-resistant isolates (11...
November 7, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27843814/dimeric-and-trimeric-fusion-proteins-generated-with-fimbrial-adhesins-of-uropathogenic-escherichia-coli
#3
Víctor M Luna-Pineda, Juan Pablo Reyes-Grajeda, Ariadnna Cruz-Córdova, Zeus Saldaña-Ahuactzi, Sara A Ochoa, Carmen Maldonado-Bernal, Vicenta Cázares-Domínguez, Leticia Moreno-Fierros, José Arellano-Galindo, Rigoberto Hernández-Castro, Juan Xicohtencatl-Cortes
Urinary tract infections (UTIs) are associated with high rates of morbidity and mortality worldwide, and uropathogenic Escherichia coli (UPEC) is the main etiologic agent. Fimbriae assembled on the bacterial surface are essential for adhesion to the urinary tract epithelium. In this study, the FimH, CsgA, and PapG adhesins were fused to generate biomolecules for use as potential target vaccines against UTIs. The fusion protein design was generated using bioinformatics tools, and template fusion gene sequences were synthesized by GenScript in the following order fimH-csgA-papG-fimH-csgA (fcpfc) linked to the nucleotide sequence encoding the [EAAAK]5 peptide...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27825516/adaptation-of-escherichia-coli-traversing-from-the-faecal-environment-to-the-urinary-tract
#4
Karen L Nielsen, Marc Stegger, Paul A Godfrey, Michael Feldgarden, Paal S Andersen, Niels Frimodt-Møller
The majority of extraintestinal pathogenic Escherichia coli (ExPEC) causing urinary tract infections (UTI) are found in the patient's own gut flora, but only limited knowledge is available on the potential adaptation that may occur in the bacteria in order to traverse the perineum and successfully infect the urinary tract. Here, matching pairs of faecal and UTI isolates from 42 patients were compared pairwise using in-depth whole-genome sequencing to investigate whether genetic changes were evident for successful colonization in these two different environments...
December 2016: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/27821778/siderophore-vaccine-conjugates-protect-against-uropathogenic-escherichia-coli-urinary-tract-infection
#5
Laura A Mike, Sara N Smith, Christopher A Sumner, Kathryn A Eaton, Harry L T Mobley
Uropathogenic Escherichia coli (UPEC) is the primary cause of uncomplicated urinary tract infections (UTIs). Whereas most infections are isolated cases, 1 in 40 women experience recurrent UTIs. The rise in antibiotic resistance has complicated the management of chronic UTIs and necessitates new preventative strategies. Currently, no UTI vaccines are approved for use in the United States, and the development of a highly effective vaccine remains elusive. Here, we have pursued a strategy for eliciting protective immunity by vaccinating with small molecules required for pathogenesis, rather than proteins or peptides...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27801366/evaluation-of-paiusp-subtyping-to-characterize-uropathogenic-e-coli-isolates
#6
Yun Mei Lai, Myo Thura Zaw, Shamsul Bahari Shamsudin, Zaw Lin
INTRODUCTION: Uropathogenic virulence factors have been identified by comparing the prevalence of these among urinary tract isolates and environmental strains. The uropathogenic-specific protein (USP) gene is present on the pathogenicity island (PAI) of uropathogenic Escherichia coli (UPEC) and, depending on its two diverse gene types and the sequential patterns of three open reading frame units (orfUs) following it, there is a method to characterize UPEC epidemiologically called PAIusp subtyping...
October 31, 2016: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/27795353/purine-biosynthesis-metabolically-constrains-intracellular-survival-of-uropathogenic-e-coli
#7
Carrie L Shaffer, Ellisa W Zhang, Anne G Dudley, Beverly R E A Dixon, Kirsten R Guckes, Erin J Breland, Kyle A Floyd, Daniel P Casella, Holly M Scott Algood, Douglass B Clayton, Maria Hadjifrangiskou
The ability to de novo synthesize purines has been associated with the intracellular survival of multiple bacterial pathogens. Uropathogenic Escherichia coli (UPEC), the predominant cause of urinary tract infections, undergoes a transient intracellular lifestyle during which bacteria clonally expand into multicellular bacterial communities within the cytoplasm of bladder epithelial cells. Here, we characterized the contribution of the conserved de novo purine biosynthesis-associated locus cvpA-purF to UPEC pathogenesis...
October 17, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27767067/the-cytochrome-bd-i-respiratory-oxidase-augments-survival-of-multidrug-resistant-escherichia-coli-during-infection
#8
Mark Shepherd, Maud E S Achard, Adi Idris, Makrina Totsika, Minh-Duy Phan, Kate M Peters, Sohinee Sarkar, Cláudia A Ribeiro, Louise V Holyoake, Dimitrios Ladakis, Glen C Ulett, Matthew J Sweet, Robert K Poole, Alastair G McEwan, Mark A Schembri
Nitric oxide (NO) is a toxic free radical produced by neutrophils and macrophages in response to infection. Uropathogenic Escherichia coli (UPEC) induces a variety of defence mechanisms in response to NO, including direct NO detoxification (Hmp, NorVW, NrfA), iron-sulphur cluster repair (YtfE), and the expression of the NO-tolerant cytochrome bd-I respiratory oxidase (CydAB). The current study quantifies the relative contribution of these systems to UPEC growth and survival during infection. Loss of the flavohemoglobin Hmp and cytochrome bd-I elicit the greatest sensitivity to NO-mediated growth inhibition, whereas all but the periplasmic nitrite reductase NrfA provide protection against neutrophil killing and promote survival within activated macrophages...
October 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27752899/persistence-of-uropathogenic-escherichia-coli-in-the-bladders-of-female-patients-with-sterile-urine-after-antibiotic-therapies
#9
Shu-Cheng Liu, Xiao-Min Han, Ming Shi, Zi-Li Pang
This study aimed to provide evidence of persistent uropathogenic Escherichia coli (UPEC) in female patients with recurrent urinary tract infection (UTI) after antibiotic therapy. We collected biopsies of the bladder, and clean-catch urine samples from 32 women who had episodes of recurrent UTI and were given antibiotic therapy. Urine samples and biopsies were analyzed by conventional bacteriological techniques. Phylogenetic group and 16 virulence factors (VFs) of UPEC were determined using polymerase chain reaction (PCR)...
October 2016: Journal of Huazhong University of Science and Technology. Medical Sciences
https://www.readbyqxmd.com/read/27744103/detection-of-ampc-%C3%AE-lactamase-and-adherence-factors-in-uropathogenic-escherichia-coli-isolated-from-aged-patients
#10
Santosh Kumar Singh, Kumari Seema, Minakshi Gupta
Escherichia coli mediated urinary tract infection has been reported to be most prevalent among patients of different class, gender and ages. Currently, multidrug resistant E. coli harboring several virulence factors are most perilous threats for patients especially for elders. The aim of this study was to determine the antibiotic resistance pattern, co-resistance and phenotypic virulence factors present in uropathogenic E. coli isolated from aged patients. Thirty-nine E. coli isolates were collected during May-June 2014 from patients between 50 to 80 years of age...
October 13, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27699248/bladder-catheterization-increases-susceptibility-to-infection-that-can-be-prevented-by-prophylactic-antibiotic-treatment
#11
Matthieu Rousseau, H M Sharon Goh, Sarah Holec, Matthew L Albert, Rohan B H Williams, Molly A Ingersoll, Kimberly A Kline
Catheter-associated urinary tract infections (CAUTI) are the most common hospital-associated infections. Here, we report that bladder catheterization initiated a persistent sterile inflammatory reaction within minutes of catheter implantation. Catheterization resulted in increased expression of genes associated with defense responses and cellular migration, with ensuing rapid and sustained innate immune cell infiltration into the bladder. Catheterization also resulted in hypersensitivity to Enterococcus faecalis and uropathogenic Escherichia coli (UPEC) infection, in which colonization was achieved using an inoculum 100-fold lower than the ID90 for infection of an undamaged urothelium with the same uropathogens...
September 22, 2016: JCI Insight
https://www.readbyqxmd.com/read/27698083/the-catabolite-repressor-protein-cyclic-amp-complex-regulates-csgd-and-biofilm-formation-in-uropathogenic-escherichia-coli
#12
David A Hufnagel, Margery L Evans, Sarah E Greene, Jerome S Pinkner, Scott J Hultgren, Matthew R Chapman
The extracellular matrix protects Escherichia coli from immune cells, oxidative stress, predation, and other environmental stresses. Production of the E. coli extracellular matrix is regulated by transcription factors that are tuned to environmental conditions. The biofilm master regulator protein CsgD upregulates curli and cellulose, the two major polymers in the extracellular matrix of uropathogenic E. coli (UPEC) biofilms. We found that cyclic AMP (cAMP) regulates curli, cellulose, and UPEC biofilms through csgD The alarmone cAMP is produced by adenylate cyclase (CyaA), and deletion of cyaA resulted in reduced extracellular matrix production and biofilm formation...
December 15, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27689912/antivirulence-c-mannosides-as-antibiotic-sparing-oral-therapeutics-for-urinary-tract-infections
#13
Laurel Mydock-McGrane, Zachary Cusumano, Zhenfu Han, Jana Binkley, Maria Kostakioti, Thomas Hannan, Jerome S Pinkner, Roger Klein, Vasilios Kalas, Jan Crowley, Nigam P Rath, Scott J Hultgren, James W Janetka
Gram-negative uropathogenic Escherichia coli (UPEC) bacteria are a causative pathogen of urinary tract infections (UTIs). Previously developed antivirulence inhibitors of the type 1 pilus adhesin, FimH, demonstrated oral activity in animal models of UTI but were found to have limited compound exposure due to the metabolic instability of the O-glycosidic bond (O-mannosides). Herein, we disclose that compounds having the O-glycosidic bond replaced with carbon linkages had improved stability and inhibitory activity against FimH...
October 14, 2016: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27667696/inflammation-induced-adhesin-receptor-interaction-provides-a-fitness-advantage-to-uropathogenic-e-%C3%A2-coli-during-chronic-infection
#14
Matt S Conover, Ségolène Ruer, Joemar Taganna, Vasilios Kalas, Henri De Greve, Jerome S Pinkner, Karen W Dodson, Han Remaut, Scott J Hultgren
Uropathogenic E. coli (UPEC) is the dominant cause of urinary tract infections, clinically described as cystitis. UPEC express CUP pili, which are extracellular fibers tipped with adhesins that bind mucosal surfaces of the urinary tract. Here we identify the role of the F9/Yde/Fml pilus for UPEC persistence in the inflamed urothelium. The Fml adhesin FmlH binds galactose β1-3 N-acetylgalactosamine found in core-1 and -2 O-glycans. Deletion of fmlH had no effect on UPEC virulence in an acute mouse model of cystitis...
October 12, 2016: Cell Host & Microbe
https://www.readbyqxmd.com/read/27602327/ameliorating-effect-of-ginseng-on-epididymo-orchitis-inducing-alterations-in-sperm-quality-and-spermatogenic-cells-apoptosis-following-infection-by-uropathogenic-escherichia-coli-in-rats
#15
Mehdi Eskandari, Soghra Jani, Mahsa Kazemi, Habib Zeighami, Alireza Yazdinezhad, Sahar Mazloomi, Saeed Shokri
OBJECTIVE: Epididymo-orchitis (EO) potentially results in reduced fertility in up to 60% of affected patients. The anti-inflammatory effects of Korean red ginseng (KRG) and its ability to act as an immunoenhancer in parallel with the beneficial effects of this ancient herbal medicine on the reproductive systems of animals and humans led us to evaluate its protective effects against acute EO. MATERIALS AND METHODS: This animal experimental study was conducted in the Department of Anatomical Sciences, Faculty of Medicine, Zanjan University of Medical Sciences (ZUMS), Zanjan, Iran during 2013-2015...
2016: Cell Journal
https://www.readbyqxmd.com/read/27600504/the-adherent-invasive-escherichia-coli-aiec-strain-lf82-invades-and-persists-in-human-prostate-cell-linerwpe-1-activating-a-strong-inflammatory-response
#16
Maria P Conte, Marta Aleandri, Massimiliano Marazzato, Antonietta L Conte, Cecilia Ambrosi, Mauro Nicoletti, Carlo Zagaglia, Guido Gambara, Fioretta Palombi, Paola De Cesaris, Elio Ziparo, Anna T Palamara, Anna Riccioli, Catia Longhi
Adherent/invasive Escherichia coli (AIEC) strains are recently receiving increased attention because they are more prevalent and persistent in the intestine of Crohn (CD) patients than in healthy subjects. Since AIEC strains show a high percentage of similarity with ExPEC NMEC and UPEC, here we compared AIEC strain LF82 with a UPEC isolate (strain EC73) to assess whether LF82 could be able to infect prostate cells, as an extra-intestinal target. The virulence phenotypes of both strains were determined by using the RWPE-1 prostate cell line...
September 6, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27572332/fur-ferric-uptake-regulator-represses-adhesion-to-invasion-of-and-intracellular-bacterial-community-ibc-formation-within-bladder-epithelial-cells-and-motility-in-uropathogenic-escherichia-coli-upec
#17
Kumiko Kurabayashi, Tomohiro Agata, Hirofumi Asano, Haruyoshi Tomita, Hidetada Hirakawa
Uropathogenic Escherichia coli (UPEC) is a major pathogen that causes urinary tracts infections (UTIs). This bacterium adheres and invades into the host cells in the bladder, where it forms biofilm-like polymicrobial structures termed intracellular bacterial community (IBC) that protect UPEC from antimicrobial agents and the host immune systems. Using genetic screening, we found that deletion of the fur gene which encodes an iron-binding transcriptional repressor for iron uptake systems elevated the expression of type I fimbriae and motility when UPEC is grown in iron-rich conditions, and led to an increased number of adhered and internalized UPEC cells to the bladder epithelial cells...
August 29, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/27541977/mexican-unpasteurised-fresh-cheeses-are-contaminated-with-salmonella-spp-non-o157-shiga-toxin-producing-escherichia-coli-and-potential-uropathogenic-e-coli-strains-a-public-health-risk
#18
Rosa Guzman-Hernandez, Araceli Contreras-Rodriguez, Rosa Hernandez-Velez, Iza Perez-Martinez, Ahide Lopez-Merino, Mussaret B Zaidi, Teresa Estrada-Garcia
Fresh cheeses are a main garnish of Mexican food. Consumption of artisanal fresh cheeses is very common and most of them are made from unpasteurised cow milk. A total of 52 fresh unpasteurised cheeses of five different types were purchased from a variety of suppliers from Tabasco, Mexico. Using the most probable number method, 67% and 63% of samples were positive for faecal coliforms and E. coli, respectively; revealing their low microbiological quality. General hygienic conditions and practices of traditional cheese manufacturers were poor; most establishments had unclean cement floors, all lacked windows and doors screens, and none of the food-handlers wore aprons, surgical masks or bouffant caps...
November 21, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27530830/multidrug-resistance-dissemination-by-extended-spectrum-%C3%AE-lactamase-producing-escherichia-coli-causing-community-acquired-urinary-tract-infection-in-the-central-western-region-brazil
#19
Laura Fernandes Gonçalves, Paulo de Oliveira Martins-Júnior, Ana Beatriz Fabrício de Melo, Rafaella Christina Rocha Moreira da Silva, Vicente de Paulo Martins, André Pitondo-Silva, Tatiana Amabile de Campos
The aim of this work was to analyse extended-spectrum β-lactamase (ESBL)-producing Escherichia coli strains isolated from outpatients with signs of cystitis in Hospital Universitário de Brasília (Brasília, Brazil) during the period July 2013 to April 2014. E. coli isolated from urine culture were identified and their antibiotic susceptibility profile was determined by VITEK 2. ESBL-producing strains identified were submitted to PCR for Clermont phylotyping, CTX-M group typing and virulence determinant detection, and clonal relationships were determined by enterobacterial repetitive intergenic consensus (ERIC)-PCR...
September 2016: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/27528276/lipopolysaccharide-domains-modulate-urovirulence
#20
Lizath M Aguiniga, Ryan E Yaggie, Anthony J Schaeffer, David J Klumpp
Uropathogenic E. coli (UPEC) account for 80-90% of urinary tract infections (UTI), and the increasing rate of antibiotic resistance among UPEC isolates reinforces the need for vaccines to prevent UTIs and recurrent infections. Previous studies have shown that UPEC isolate NU14 suppresses pro-inflammatory NFκB-dependent cytokines. However, modification of lipopolysaccharide (LPS) structure by deleting the O-antigen ligase gene (waaL) enhanced pro-inflammatory cytokine secretion. Vaccination with ΔwaaL diminished NU14 reservoirs, and protected against subsequent infections...
August 15, 2016: Infection and Immunity
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