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Uropathogen

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https://www.readbyqxmd.com/read/29345620/functional-role-of-the-type-1-pilus-rod-structure-in-mediating-host-pathogen-interactions
#1
Caitlin N Spaulding, Henry Louis Schreiber, Weili Zheng, Karen W Dodson, Jennie E Hazen, Matt S Conover, Fengbin Wang, Pontus Svenmarker, Areli Luna-Rico, Olivera Francetic, Magnus Andersson, Scott Hultgren, Edward H Egelman
Uropathogenic E. coli (UPEC), which cause urinary tract infections (UTI), utilize type 1 pili, a chaperone usher pathway (CUP) pilus, to cause UTI and colonize the gut. The pilus rod, comprised of repeating FimA subunits, provides a structural scaffold for displaying the tip adhesin, FimH. We solved the 4.2 Å resolution structure of the type 1 pilus rod using cryo-electron microscopy. Residues forming the interactive surfaces that determine the mechanical properties of the rod were maintained by selection based on a global alignment of fimA sequences...
January 18, 2018: ELife
https://www.readbyqxmd.com/read/29340897/invasion-and-translocation-of-uropathogenic-escherichia-coli-isolated-from-urosepsis-and-patients-with-community-acquired-urinary-tract-infection
#2
B Owrangi, N Masters, A Kuballa, C O'Dea, T L Vollmerhausen, M Katouli
Uropathogenic Escherichia coli (UPEC) strains are found in high numbers in the gut of patients with urinary tract infections (UTIs). We hypothesised that in hospitalised patients, UPEC strains might translocate from the gut to the blood stream and that this could be due to the presence of virulence genes (VGs) that are not commonly found in UPEC strains that cause UTI only. To test this, E. coli strains representing 75 dominant clonal groups of UPEC isolated from the blood of hospitalised patients with UTI (urosepsis) (n = 22), hospital-acquired (HA) UTI without blood infection (n = 24) and strains isolated from patients with community-acquired (CA)-UTIs (n = 29) were tested for their adhesion to, invasion and translocation through Caco-2 cells, in addition to the presence of 34 VGs associated with UPEC...
January 16, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29339564/accuracy-of-the-urinalysis-for-urinary-tract-infections-in-febrile-infants-60-days-and-younger
#3
Leah Tzimenatos, Prashant Mahajan, Peter S Dayan, Melissa Vitale, James G Linakis, Stephen Blumberg, Dominic Borgialli, Richard M Ruddy, John Van Buren, Octavio Ramilo, Nathan Kuppermann
OBJECTIVES: Reports of the test accuracy of the urinalysis for diagnosing urinary tract infections (UTIs) in young febrile infants have been variable. We evaluated the test characteristics of the urinalysis for diagnosing UTIs, with and without associated bacteremia, in young febrile infants. METHODS: We performed a planned secondary analysis of data from a prospective study of febrile infants ≤60 days old at 26 emergency departments in the Pediatric Emergency Care Applied Research Network...
January 16, 2018: Pediatrics
https://www.readbyqxmd.com/read/29339393/early-clinical-assessment-of-the-antimicrobial-activity-of-finafloxacin-compared-to-ciprofloxacin-in-sub-sets-of-microbiologically-characterized-isolates
#4
Andreas Vente, Christine Bentley, Mark Lückermann, Paul Tambyah, Axel Dalhoff
INTRODUCTION: Two phase II studies were performed in patients with uncomplicated (uUTI) and complicated urinary tract infections or acute pyelonephritis (cUTI/PN) to compare finafloxacin (300 mg b.i.d, p.o. for uUTI 800 mg q.d., i.v. for cUTI/PN) and ciprofloxacin (250 mg b.i.d, p.o. for uUTI and 400 mg b.i.d., i.v. for cUTI/PN). The early response to the study medications was evaluated in the microbiological-intent-to treat population (mITT) at day 3. RESULTS: 21% of the isolates were ciprofloxacin-resistant, 13...
January 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29339296/silent-transmission-of-an-is1294b-deactivated-mcr-1-gene-with-inducible-colistin-resistance
#5
Kai Zhou, Qixia Luo, Qin Wang, Chen Huang, Haifeng Lu, Rossen W A John, Yonghong Xiao, Lanjuan Li
The global dissemination of the mobile colistin resistance mcr-1 is of special concern, as colistin is one of the last-resort antibiotics for the treatment of severe infections caused by carbapenem-resistant Gram-negative bacteria. Here, we characterized an inactive form of mcr-1 in a fluoroquinolone-resistant and colistin-susceptible uropathogenic Escherichia coli isolate (ECO3347). The mcr-1 gene was deactivated by the insertion of a 1.7-Kb IS1294b element flanked by two tetramers (GTTC), and located on a 62-Kb pHNSHP45-like plasmid (p3347-mcr-1)...
January 12, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29327292/alterations-of-growth-rate-and-gene-expression-levels-of-upec-by-antibiotics-at-sub-mic
#6
Defne Gümüş, Fatma Kalaycı-Yüksek, Emre Yörük, Gülşen Uz, Eşref Çelik, Cansu Arslan, Elif Merve Aydın, Cem Canlı, Mine Anğ-Küçüker
The host is the main environment for bacteria, and they also expose to many antibiotics during the treatment of infectious diseases in host body. In this study, it was aimed to investigate possible changes in growth rate and expression levels of three virulence genes (foc/foc, cnf1, and usp) in a uropathogenic E. coli standard strain within the presence of ciprofloxacin, nitrofurantoin, and trimethoprim-sulfamethoxazole. The UPEC C7 strain was grown on tryptic soy broth-TSB (control), TSB + ciprofloxacin, TSB + nitrofurantoin, and TSB + trimethoprim-sulfamethoxazole for determination of both growth rate and gene expression level...
January 11, 2018: Folia Microbiologica
https://www.readbyqxmd.com/read/29326207/complete-genome-sequence-of-bacteriophage-st11ph5-which-infects-uropathogenic-escherichia-coli-strain-up11
#7
Alla K Golomidova, Eugene E Kulikov, Vladislav V Babenko, Elena S Kostryukova, Andrey V Letarov
Bacteriophage St11Ph5 was isolated from a sewage sample on a particularly phage-resistant uropathogenic Escherichia coli (UPEC) up11 host strain. It appeared to be closely related to bacteriophage G7C, isolated from horse feces; however, it carries a highly divergent host recognition module.
January 11, 2018: Genome Announcements
https://www.readbyqxmd.com/read/29324795/nanodiamonds-facilitate-killing-of-intracellular-uropathogenic-e-coli-in-an-in-vitro-model-of-urinary-tract-infection-pathogenesis
#8
Janaki Kannan Iyer, Alexia Dickey, Parvaneh Rouhani, Anil Kaul, Nirmal Govindaraju, Raj Narain Singh, Rashmi Kaul
About 25-44% of women will experience at least one episode of recurrent UTI and the causative agent in over 70% of UTI cases is uropathogenic Escherichia coli (UPEC). UPEC cause recurrent UTI by evading the bladder's innate immune system through internalization into the bladder epithelium where antibiotics cannot reach or be effective. Thus, it is important to develop novel therapeutics to eliminate these intracellular pathogens. Nanodiamonds (NDs) are biocompatible nanomaterials that serve as promising candidates for targeted therapeutic applications...
2018: PloS One
https://www.readbyqxmd.com/read/29320984/prevalence-and-antibiotic-susceptibility-of-uropathogens-from-cases-of-urinary-tract-infections-uti-in-shashemene-referral-hospital-ethiopia
#9
Wubalem Desta Seifu, Alemayehu Desalegn Gebissa
BACKGROUND: Urinary tract infection (UTI) remains to be one of the most common infectious diseases diagnosed in developing countries. And a widespread use of antibiotics against uropathogens has led to the emergence of antibiotic resistant species. A laboratory based cross-sectional survey was conducted in Shashemene referral hospital to determine the prevalence and antibiotic susceptibility of uropathogens. METHODS: We have collected 384 clean catch mid-stream urine samples from all suspected UTI outpatients using sterile screw capped container...
January 10, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29317513/cyclic-amp-regulates-bacterial-persistence-through-repression-of-the-oxidative-stress-response-and-sos-dependent-dna-repair-in-uropathogenic-escherichia-coli
#10
Roberto C Molina-Quiroz, Cecilia Silva-Valenzuela, Jennifer Brewster, Eduardo Castro-Nallar, Stuart B Levy, Andrew Camilli
Bacterial persistence is a transient, nonheritable physiological state that provides tolerance to bactericidal antibiotics. The stringent response, toxin-antitoxin modules, and stochastic processes, among other mechanisms, play roles in this phenomenon. How persistence is regulated is relatively ill defined. Here we show that cyclic AMP, a global regulator of carbon catabolism and other core processes, is a negative regulator of bacterial persistence in uropathogenic Escherichia coli, as measured by survival after exposure to a β-lactam antibiotic...
January 9, 2018: MBio
https://www.readbyqxmd.com/read/29313570/fosfomycin-susceptibility-in-urinary-tract-enterobacteriaceae
#11
Bhargav Patel, Kinjal Patel, Anjali Shetty, Rajeev Soman, Camilla Rodrigues
Introduction: Antibiotic treatment of Urinary Tract Infections (UTI) is becoming increasingly difficult due to emergence of multi-drug resistant (ESBLs, AmpC, CRE) uropathogens. Fosfomycin is an old antibiotic that has evoked renewed interest with unique properties of not sharing any structural similarity and lack of cross-resistance with other antimicrobial agents. Our aim is to evaluate in-vitro activity of Fosfomycin against urinary tract Enterobacteriaceae. Material & Methods: The study period was March 2014 to September 2015...
September 2017: Journal of the Association of Physicians of India
https://www.readbyqxmd.com/read/29311237/evaluation-of-cpxra-as-a-therapeutic-target-for-uropathogenic-escherichia-coli-infections
#12
Lana Dbeibo, Julia J van Rensburg, Sara N Smith, Kate R Fortney, Dharanesh Gangaiah, Hongyu Gao, Juan Marzoa, Yunlong Liu, Harry L T Mobley, Stanley M Spinola
CpxRA is an envelope stress response system found in all species of Enterobacteriaceae; CpxA has kinase activity for CpxR and phosphatase activity for phospho-CpxR, a transcription factor. CpxR also accepts phosphate groups and acetyl phosphate, a glucose metabolite. Activation of CpxR increases transcription of genes encoding for membrane repair and downregulates virulence determinants. We hypothesized that activation of CpxR could serve as an antimicrobial/antivirulence strategy and discovered compounds that activate CpxR in Escherichia coli by inhibiting CpxA phosphatase activity...
January 8, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29310594/the-impact-of-cathelicidin-the-human-antimicrobial-peptide-ll-37-in-urinary-tract-infections
#13
Ibrahim H Babikir, Elsir A Abugroun, Naser Eldin Bilal, Abdullah Ali Alghasham, Elmuataz Elmansi Abdalla, Ishag Adam
BACKGROUND: The defense mechanisms of the urinary tract are attributed mainly to the innate immune system and the urinary tract urothelium which represent the first line of defense against invading pathogens and maintaining sterility of the urinary tract. There are only a few publications regarding cathelicidin (LL-37) and a urinary tract infection (UTI). This study was done to investigate the plasma and urine levels of human LL-37 in patients with UTI. METHODS: A case-control study was conducted at Omdurman Hospital, Sudan during the period from August 2014 to May 2017...
January 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29310191/re-selective-depletion-of-uropathogenic-e-coli-from-the-gut-by-a-fimh-antagonist
#14
Anthony Atala
No abstract text is available yet for this article.
January 2018: Journal of Urology
https://www.readbyqxmd.com/read/29305503/elucidating-waterborne-pathogen-presence-and-aiding-source-apportionment-in-an-impaired-stream
#15
Jennifer Weidhaas, Angela Anderson, Rubayat Jamal
Fecal indicator bacteria (FIB) are the basis for water quality regulations and are considered proxies for waterborne pathogens when conducting human health risk assessments. Direct detection of pathogens in water and simultaneous identification of the source of fecal contamination is possible with microarrays, circumventing drawbacks to FIB approaches. A multi-gene target microarray was used to assess the prevalence of waterborne pathogens in a fecally impaired, mixed use watershed. Results indicate that fecal coliforms have improved substantially in the watershed since its listing as a 303(d) impaired stream in 2002 and are now near United States recreational water criteria standards...
January 5, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29305250/diagnosis-and-treatment-of-urinary-tract-infections-across-age-groups
#16
REVIEW
Christine M Chu, Jerry L Lowder
Urinary tract infections (UTI) are the most common outpatient infections, but predicting the probability of UTI through symptoms and test results can be complex. The most diagnostic symptoms of UTI include change in frequency, dysuria, urgency, and presence or absence of vaginal discharge, but UTIs may present differently in older women. Dipstick urinalysis is popular for its availability and usefulness, but results must be interpreted in context of the patient's pretest probability based on symptoms and characteristics...
January 2, 2018: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/29304717/analysis-of-the-spectrum-and-antibiotic-resistance-of-uropathogens-in-outpatients-at-a-tertiary-hospital
#17
Bo Yang, Fujia Yang, Shanmei Wang, Qian Wang, Zhirui Liu, Wei Feng, Fengjun Sun, Peiyuan Xia
The objective of this study was to analyse the distribution and antimicrobial resistance of bacterial uropathogens isolated from outpatients at Henan Provincial People's Hospital. A total of 1419 samples from 823 newly diagnosed and 596 recurrent UTI outpatients culture positive. Escherichia coli was the most common uropathogen. Compared with the recurrent group, the newly diagnosed group had a higher isolation rate of E. coli and Enterobacter cloacae but a lower isolation rate of Klebsiella pneumoniae, Pseudomonas aeruginosa and Acinetobacter spp...
January 5, 2018: Journal of Chemotherapy
https://www.readbyqxmd.com/read/29300775/analytical-profiling-of-mutations-in-quinolone-resistance-determining-region-of-gyra-gene-among-upec
#18
Lesley R Varughese, Meenakshi Rajpoot, Soniya Goyal, Ravinder Mehra, Vinod Chhokar, Vikas Beniwal
Mutations in gyrA are the primary cause of quinolone resistance encountered in gram-negative clinical isolates. The prospect of this work was to analyze the role of gyrA mutations in eliciting high quinolone resistance in uropathogenic E.coli (UPEC) through molecular docking studies. Quinolone susceptibility testing of 18 E.coli strains isolated from UTI patients revealed unusually high resistance level to all the quinolones used; especially norfloxacin and ciprofloxacin. The QRDR of gyrA was amplified and sequenced...
2018: PloS One
https://www.readbyqxmd.com/read/29300289/urinary-sample-collection-methods-in-ileal-conduit-urinary-diversion-patients-a-randomized-control-trial
#19
Markku H Vaarala
PURPOSE: The purpose of this study was to compare bacteriological urinalysis findings using 3 urinary sample collection methods (clean stoma catheterization, urine dripping from the stoma, urine collected from the clean urostomy pouch) in ileal conduit urinary diversion patients. DESIGN: Randomized controlled trial. SAMPLE AND SETTING: Twenty-seven patients with ileal conduit urinary diversion from an outpatient urology clinic were enrolled; 9 patients were seen twice, for a total of 36 subjects and comparisons...
January 2018: Journal of Wound, Ostomy, and Continence Nursing
https://www.readbyqxmd.com/read/29288300/biogenic-synthesis-of-silver-nanoparticles-using-piper-betle-aqueous-extract-and-evaluation-of-its-anti-quorum-sensing-and-antibiofilm-potential-against-uropathogens-with-cytotoxic-effects-an-in-vitro-and-in-vivo-approach
#20
Ramanathan Srinivasan, Loganathan Vigneshwari, Tamilselvam Rajavel, Ravindran Durgadevi, Arunachalam Kannappan, Krishnaswamy Balamurugan, Kasi Pandima Devi, Arumugam Veera Ravi
Urinary tract infections are the utmost common bacterial infections caused by Proteus mirabilis, Pseudomonas aeruginosa, Escherichia coli, and Serratia marcescens. These uropathogens resist the action of several antibiotics due to their ability to form biofilms. Most of these bacterial pathogens use the quorum sensing (QS) machinery to co-ordinate their cells and regulate several virulence factors and biofilm formation. On the other hand, the anti-quorum sensing (anti-QS) and antibiofilm potential of silver nanoparticles have been well reported against certain bacterial pathogens, but to the best of our knowledge, no report is available against the pathogenicity of uropathogens in particular S...
December 29, 2017: Environmental Science and Pollution Research International
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