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Uropathogens

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https://www.readbyqxmd.com/read/28087946/invasion-of-host-cells-and-tissues-by-uropathogenic-bacteria
#1
Adam J Lewis, Amanda C Richards, Matthew A Mulvey
Within the mammalian urinary tract uropathogenic bacteria face many challenges, including the shearing flow of urine, numerous antibacterial molecules, the bactericidal effects of phagocytes, and a scarcity of nutrients. These problems may be circumvented in part by the ability of uropathogenic Escherichia coli and several other uropathogens to invade the epithelial cells that line the urinary tract. By entering host cells, uropathogens can gain access to additional nutrients and protection from both host defenses and antibiotic treatments...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087935/diagnosis-treatment-and-prevention-of-urinary-tract-infection
#2
Paula Pietrucha-Dilanchian, Thomas M Hooton
UTI may involve the lower or upper urinary tract and may be uncomplicated or complicated. The emphasis of this chapter is uncomplicated UTI. The diagnosis of uncomplicated cystitis (bladder infection) and pyelonephritis (kidney infection) is usually easily made based on the clinical presentation, whereas the diagnosis in patients with complicated UTI is often more complex. Thus uncomplicated cystitis is usually manifested by dysuria, frequency and/or urgency without fever, and pyelonephritis is usually manifested by fever and back pain/costovertebral angle tenderness...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087925/host-responses-to-urinary-tract-infections-and-emerging-therapeutics-sensation-and-pain-within-the-urinary-tract
#3
Lori A Birder, David J Klumpp
Urinary tract infection (UTI) pathogenesis is understood increasingly at the level of the uropathogens and the cellular and molecular mediators of host inflammatory responses. However, little is known about the mediators of symptoms during UTI and what distinguishes symptomatic events from asymptomatic bacteriuria. Here, we review bladder physiology and sensory pathways in the context of an emerging literature from murine models dissecting the host and pathogen factors mediating pain responses during UTI. The bladder urothelium is considered a mediator of sensory responses and appears to play a role in UTI pain responses...
October 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087472/extract-of-clinopodium-bolivianum-protects-against-e-coli-invasion-of-uroepithelial-cells
#4
Soumitra Mohanty, Witchuda Kamolvit, Silvia Zambrana, Corine Sandström, Eduardo Gonzales, Claes-Göran Östenson, Annelie Braunerf
ETHNOPHARMACOLOGICAL RELEVANCE: Clinopodium bolivianum is a South American plant with anti-inflammatory and anti-infective activities. The increasing antibiotic resistance urges for alternative therapy. Based on its use in traditional medicine, we investigated the effect of C. bolivianum on the ability to defend bladder epithelial cells from E. coli infection. MATERIALS AND METHODS: The extract was analysed by LC-MS. Bladder epithelial cell lines T24 and 5637 and uropathogenic E...
January 10, 2017: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/28087318/etiologies-of-community-onset-urinary-tract%C3%A2-infections-requiring-hospitalization-and%C3%A2-antimicrobial-susceptibilities-of%C3%A2-causative-microorganisms
#5
Chih-Chien Chiu, Tzu-Chao Lin, Rui-Xin Wu, Ya-Sung Yang, Po-Jen Hsiao, Yi Lee, Jung-Chung Lin, Feng-Yee Chang
BACKGROUND: Community-onset urinary tract infections (CoUTIs) are the most common bacterial infections, and a decline in antibiotic susceptibility causes many clinical challenges. Adequate empiric antibiotic treatment can decrease unnecessary hospital stays and complications, while reducing the antimicrobial resistance progression. METHODS: From October 2014 to April 2015, we retrospectively enrolled patients who were at least 18 years old and required hospitalization for CoUTIs...
December 18, 2016: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28081324/treatment-efficacy-and-superinfection-rates-in-complicated-urinarytract-infections-treated-with-ertapenem-or-piperacillin-tazobactam
#6
Murat Dizbay, Hasan Selçuk Özger, Ömer Karaşahin, Emine Fusun Karaşahin
BACKGROUND/AIM: In this retrospective study, the efficacy of ertapenem and piperacillin tazobactam was compared in the treatment of complicated urinary tract infections (cUTIs). Treatment responses were also evaluated for both antibiotics. MATERIALS AND METHODS: A total of 230 patients were enrolled in the study. Of these, 170 received ertapenem and 60 received piperacillin-tazobactam. RESULTS: In both groups, urine cultures after 48 h were negative for the initial uropathogen...
December 20, 2016: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28076665/carbohydrate-lectin-interactions-an-unexpected-contribution-to-affinity
#7
Giulio Navarra, Pascal Zihlmann, Roman P Jakob, Katia Stangier, Roland C Preston, Said Rabbani, Martin Smiesko, Bea Wagner, Timm Maier, Beat Ernst
Uropathogenic E. coli exploit the PapG-II adhesin for infecting host cells of the kidney; moreover, the expression of PapG-II located at the tip of bacterial pili has been correlated with the onset of pyelonephritis in humans, a potentially life-threatening condition. It was envisaged that the blocking of PapG-II, and thus bacterial adhesion, embodies a viable therapeutic alternative to conventional antibiotic treatment. Within our search for potent PapG-II antagonists, we observed an increase in affinity when tetrasaccharide 1, the natural ligand of PapG-II in human kidneys, was elongated to hexasaccharide 2, although the additional Siaα(2-3)Gal extension is not in direct contact with the lectin...
January 11, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28074004/signaling-by-two-component-system-noncognate-partners-promotes-intrinsic-tolerance-to-polymyxin-b-in-uropathogenic-escherichia-coli
#8
Kirsten R Guckes, Erin J Breland, Ellisa W Zhang, Sarah C Hanks, Navleen K Gill, Holly M S Algood, Jonathan E Schmitz, Charles W Stratton, Maria Hadjifrangiskou
Bacteria use two-component systems (TCSs) to react appropriately to environmental stimuli. Typical TCSs comprise a sensor histidine kinase that acts as a receptor coupled to a partner response regulator that coordinates changes in bacterial behavior, often through its activity as a transcriptional regulator. TCS interactions are typically confined to cognate pairs of histidine kinases and response regulators. We describe two distinct TCSs in uropathogenic Escherichia coli (UPEC) that interact to mediate a response to ferric iron...
January 10, 2017: Science Signaling
https://www.readbyqxmd.com/read/28070848/intravaginal-delivery-of-polyphenon-60-and-curcumin-nanoemulsion-gel
#9
Atinderpal Kaur, Yashaswee Saxena, Rakhi Bansal, Sonal Gupta, Amit Tyagi, Rakesh Kumar Sharma, Javed Ali, Amulya Kumar Panda, Reema Gabrani, Shweta Dang
Polyphenon 60 (P60) and curcumin (CUR) were loaded in a single nanoemulsion system and their combined antibacterial action was studied against uropathogenic Escherichia coli. To enhance availability at target organs and to inhibit enzymatic degradation in gastro intestinal tract, vaginal route of administration was explored. P60 + CUR nanoemulsion (NE) was formulated by ultra-sonication and optimized using Box-Behnken design. Optimized NE showed Z-average of 211.2 nm, polydispersity index of 0.343, and zeta potential of -32...
January 9, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28063174/oral-supplementation-of-trans-cinnamaldehyde-reduces-uropathogenic-escherichia-coli-colonization-in-a-mouse-model
#10
Amoolya Narayanan, Muhammed Shafeekh Muyyarikkandy, Shankumar Mooyottu, Kumar Venkitanarayanan, Mary Anne Roshni Amalaradjou
Urinary tract infections (UTIs) in the United States result in more than 7 million hospital visits per year. Uropathogenic E. coli (UPEC) is responsible for more than 80% of UTIs. Although antibiotics are the drug of choice to control UTIs, their repeated use has resulted in the emergence of antibiotic resistant UPEC. Thus, there is a need for effective alternate strategies to control UPEC infections. This study investigated the efficacy of trans-cinnamaldehye (TC), a food-grade molecule present in cinnamon, in reducing UPEC colonization and pathogenesis in the lower UTI...
January 7, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28061852/the-occurrence-of-esbl-producing-escherichia-coli-carrying-aminoglycoside-resistance-genes-in-urinary-tract-infections-in-saudi-arabia
#11
Essam J Alyamani, Anamil M Khiyami, Rayan Y Booq, Majed A Majrashi, Fayez S Bahwerth, Elena Rechkina
BACKGROUND: The infection and prevalence of extended-spectrum β-lactamases (ESBLs) is a worldwide problem, and the presence of ESBLs varies between countries. In this study, we investigated the occurrence of plasmid-mediated ESBL/AmpC/carbapenemase/aminoglycoside resistance gene expression in Escherichia coli using phenotypic and genotypic techniques. METHODS: A total of 58 E. coli isolates were collected from hospitals in the city of Makkah and screened for the production of ESBL/AmpC/carbapenemase/aminoglycoside resistance genes...
January 6, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28053916/urinary-tract-infections-a-retrospective-descriptive-study-of-causative-organisms-and-antimicrobial-pattern-of-samples-received-for-culture-from-a-tertiary-care-setting
#12
Bhuvanesh Sukhlal Kalal, Savitha Nagaraj
INTRODUCTION: Urinary tract infections (UTI) are common infections encountered by physicians either on an outpatient or inpatient basis. These infections have taken center stage due to increasing resistance being reported for commonly used antibiotics. Understanding the distribution and antibiotic susceptibility patterns of uropathogens would facilitate appropriate therapy. METHODS: A retrospective analysis of the culture isolates obtained from urine samples received at the Department of Microbiology, St...
December 2016: Germs
https://www.readbyqxmd.com/read/28049430/spread-of-avian-pathogenic-escherichia-coli-st117-o78-h4-in-nordic-broiler-production
#13
Troels Ronco, Marc Stegger, Rikke Heidemann Olsen, Camilla Sekse, Anne Bang Nordstoga, Tarja Pohjanvirta, Berit Lilje, Ulrike Lyhs, Paal Skytt Andersen, Karl Pedersen
BACKGROUND: Escherichia coli infections known as colibacillosis constitute a considerable challenge to poultry farmers worldwide, in terms of decreased animal welfare and production economy. Colibacillosis is caused by avian pathogenic E. coli (APEC). APEC strains are extraintestinal pathogenic E. coli and have in general been characterized as being a genetically diverse population. In the Nordic countries, poultry farmers depend on import of Swedish broiler breeders which are part of a breeding pyramid...
January 3, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28043017/evolution-and-structural-dynamics-of-bacterial-glycan-binding-adhesins
#14
REVIEW
Kristof Moonens, Han Remaut
Infectious disease processes like bacterial adherence or the activity of secreted toxins frequently gain host and tissue specificity by glycan binding interactions with the host glycome. Recent functional and structural studies highlight the high niche specialization of bacterial lectins, but also reveal a remarkable plasticity in their glycan binding sites and mechanisms, to adapt to host glycome dynamics or changing environmental conditions at the site of infection. In this review we put emphasis on new structural insights in host adaptation and dynamics of bacterial carbohydrate binding adhesins and toxins in human pathogens like uropathogenic and enteropathogenic Escherichia coli, Helicobacter pylori, Yersinia pestis or Vibrio cholera...
December 30, 2016: Current Opinion in Structural Biology
https://www.readbyqxmd.com/read/28042660/determination-of-minimum-biofilm-eradication-concentrations-of-orbifloxacin-for-canine-bacterial-uropathogens-over-different-treatment-periods
#15
Takae Shimizu, Kazuki Harada
Biofilm formation can cause refractory urinary tract infections (UTIs) in dogs; however, minimum biofilm eradication concentrations (MBECs) of veterinary drugs against canine uropathogens remain to be investigated. In this study, we determined the MBECs of orbifloxacin (OBFX), trimethoprim-sulfamethoxazole (TMS), and amoxicillin/clavulanate (ACV) over different time periods for treatment of canine uropathogenic Escherichia coli (n = 10). We also determined the MBECs of OBFX for other bacterial uropathogens, including Staphylococcus pseudintermedius (n = 5), Pseudomonas aeruginosa (n = 5), Klebsiella pneumoniae (n=5), and Proteus mirabilis (n=5)...
January 2, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28040531/traditionally-used-medicinal-plants-against-uncomplicated-urinary-tract-infections-hexadecyl-coumaric-acid-ester-from-the-rhizomes-of-agropyron-repens-l-p-beauv-with-antiadhesive-activity-against-uropathogenic-e-coli
#16
Shabnam Sarshar Beydokthi, Jandirk Sendker, Simone Brandt, Andreas Hensel
The rhizomes from Agropyron repens are traditionally used for the treatment of uncomplicated urinary tract infections. Extracts prepared with solvents of different polarity did not show any cytotoxic effects against different strains of uropathogenic E. coli (UPEC) and human T24 bladder cells under in vitro conditions. Significant antiadhesive activity against the bacterial attachment to human T24 bladder cells was found for an acetone extract (AAE) at concentrations >250μg/mL. More hydrophilic extracts did not influence the bacterial attachment to the eukaryotic host cells...
December 29, 2016: Fitoterapia
https://www.readbyqxmd.com/read/28031261/copper-is-a-host-effector-mobilized-to-urine-during-urinary-tract-infection-to-impair-bacterial-colonization
#17
Amanda N Hyre, Kylie Kavanagh, Nancy D Kock, George L Donati, Sargurunathan Subashchandrabose
Urinary tract infection (UTI) is a major global infectious disease affecting millions of people annually. Human urinary copper (Cu) content is elevated during UTI caused by uropathogenic E. coli (UPEC). UPEC upregulate the expression of Cu efflux genes during clinical UTI in patients as an adaptive response to host-derived Cu. Whether Cu is mobilized to urine as a host response to UTI and its role in protection against UTI remain unresolved. To address these questions, we tested the hypothesis that Cu is a host effector mobilized to urine during UTI to limit bacterial growth...
December 28, 2016: Infection and Immunity
https://www.readbyqxmd.com/read/28028717/multi-drug-resistant-uropathogenic-escherichia-coli-and-its-treatment-by-chinese-medicine
#18
Shi-Wei Liu, Xiao-Yang Xu, Jie Xu, Jiu-Yun Yuan, Wei-Kang Wu, Ning Zhang, Ze-Liang Chen
OBJECTIVES: To investigate the resistance and virulence profiles of uropathogenic Escherichia coli (UPEC) and its treatment by Chinese medicine (CM) Fuzheng Qingre Lishi Formula (, FQLF). METHODS: UPEC strains were isolated from recurrent urinary tract infections (UTIs) patients. Patient sensitivities to 17 antibiotics were tested by the disk diffusion method. Virulence genes were screened by plolymerase chain reaction. A mouse model was constructed using a multi-drug resistant and virulent UPEC strain and treated with FQLF or the antibiotic imipenem...
December 27, 2016: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28028294/emergence-of-ctx-m-15-producing-e-coli-o25b-st131-clone-in-a-tertiary-care-hospital-of-bangladesh
#19
N Begum, S M Shamsuzzaman
BACKGROUND: Extended-spectrum β-lactamase (ESBL) producing uropathogens has become prevalent worldwide. E. coli O25b-ST131 clone, associated with blaCTX-M-15, has been reported from many parts of the world and is frequently associated with multidrug resistance. Thus far, there are no reports about this clone in Bangladesh. The objective of this study was to investigate ESBL producing uropathogens and to survey the prevalence of E. coli O25b-ST131 clone among ESBL positive E. coli isolates...
December 2016: Malaysian Journal of Pathology
https://www.readbyqxmd.com/read/28017513/from-catheter-to-kidney-stone-the-uropathogenic-lifestyle-of-proteus-mirabilis
#20
REVIEW
Allison N Norsworthy, Melanie M Pearson
Proteus mirabilis is a model organism for urease-producing uropathogens. These diverse bacteria cause infection stones in the urinary tract and form crystalline biofilms on indwelling urinary catheters, frequently leading to polymicrobial infection. Recent work has elucidated how P. mirabilis causes all of these disease states. Particularly exciting is the discovery that this bacterium forms large clusters in the bladder lumen that are sites for stone formation. These clusters, and other steps of infection, require two virulence factors in particular: urease and MR/P fimbriae...
December 22, 2016: Trends in Microbiology
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