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https://www.readbyqxmd.com/read/28077674/population-structure-of-japanese-extraintestinal-pathogenic-escherichia-coli-and-its-relationship-with-antimicrobial-resistance
#1
Yasufumi Matsumura, Taro Noguchi, Michio Tanaka, Toru Kanahashi, Masaki Yamamoto, Miki Nagao, Shunji Takakura, Satoshi Ichiyama
OBJECTIVES: To define the population structure of extraintestinal pathogenic Escherichia coli (ExPEC) in Japan and its relationship with antimicrobial resistance and the major resistance mechanisms for fluoroquinolones and β-lactams, we designed a multicentre prospective study. METHODS: A total of 329 ExPEC isolates were collected at 10 Japanese acute-care hospitals during December 2014. We defined the clonal groups of ExPEC by fumC and fimH sequencing (CH typing)...
January 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28072925/impact-of-low-and-high-doses-of-marbofloxacin-on-the-selection-of-resistant-enterobacteriaceae-in-the-commensal-gut-flora-of-young-cattle-discussion-of-data-from-2-study-populations
#2
Guillaume Lhermie, Véronique Dupouy, Farid El Garch, Nadine Ravinet, Pierre-Louis Toutain, Alain Bousquet-Mélou, Henri Seegers, Sébastien Assié
In the context of requested decrease of antimicrobial use in veterinary medicine, our objective was to assess the impact of two doses of marbofloxacin administered on young bulls (YBs) and veal calves (VCs) treated for bovine respiratory disease, on the total population of Enterobacteriaceae in gut flora and on the emergence of resistant Enterobacteriaceae. In two independent experiments, 48 YBs from 6 commercial farms and 33 VCs previously colostrum deprived and exposed to cefquinome were randomly assigned to one of the three groups LOW, HIGH, and Control...
January 10, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28065892/rapid-detection-of-the-plasmid-mediated-quinolone-resistance-determinant-aac-6-ib-cr-in-enterobacteriaceae-by-maldi-tof-ms-analysis
#3
Marina Oviaño, Jose Manuel Rodríguez-Martínez, Álvaro Pascual, Germán Bou
OBJECTIVES: Rapid detection of the plasmid-mediated quinolone resistance determinant AAC(6')-Ib-cr in Enterobacteriaceae by measuring acetyltransferase activity against fluoroquinolones by MALDI-TOF MS analysis. METHODS: The presence of the AAC(6')-Ib-cr enzyme was determined by MS by measuring the acetyltransferase activity of a collection of 81 isogenic Escherichia coli control strains [10 carrying the AAC(6')-Ib-cr enzyme during exposure to ciprofloxacin, norfloxacin and levofloxacin] and further analysis of 36 clinical isolates [25 carrying the AAC(6')-Ib-cr enzyme in addition to different combinations of quinolone resistance mechanisms]...
January 8, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28063087/antimicrobial-activity-and-acute-toxicity-of-ozonated-lomefloxacin-solution
#4
Amanda Marchi Duarte de Oliveira, Milena Guedes Maniero, Caio Rodrigues-Silva, José Roberto Guimarães
Lomefloxacin (LOM) is a synthetic antimicrobial from the fluoroquinolone family (FQ) used as a veterinary and human drug. Once in the environment, LOM may pose a risk to aquatic and terrestrial microorganisms due to its antimicrobial activity. This study evaluated the effect of ozonation of LOM (500 μg L(-1)), the residual antimicrobial activity against Escherichia coli and acute toxicity against Vibrio fischeri. In addition, degradation products were investigated by UHPLC-MS/MS and proposed. Ozonation was carried out varying the applied ozone dose from 0 to 54...
January 7, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28052123/determination-of-the-mutant-selection-window-and-evaluation-of-the-killing-of-mycoplasma-gallisepticum-by-danofloxacin-doxycycline-tilmicosin-tylvalosin-and-valnemulin
#5
Nan Zhang, Xiaomei Ye, Yuzhi Wu, Zilong Huang, Xiaoyan Gu, Qinren Cai, Xiangguang Shen, Hongxia Jiang, Huanzhong Ding
Mycoplasma gallisepticum is a common etiological cause of a chronic respiratory disease in chickens; its increasing antimicrobial resistance compromises the use of tetracyclines, macrolides and quinolones in the farm environment. Mutant selection window (MSW) determination was used to investigate the propensity for future resistance induction by danofloxacin, doxycycline, tilmicosin, tylvalosin and valnemulin. Killing of M. gallisepticum strain S6 by these antimicrobials was also studied by incubating M. gallisepticum into medium containing the compounds at the minimal concentration that inhibits colony formation by 99% (MIC99) and the mutant prevention concentration (MPC)...
2017: PloS One
https://www.readbyqxmd.com/read/28045693/kelch-like-ech-associated-protein-1-dependent-nuclear-factor-e2-related-factor-2-activation-in-relation-to-antioxidation-induced-by-sevoflurane-preconditioning
#6
Min Cai, Li Tong, Beibei Dong, Wugang Hou, Likai Shi, Hailong Dong
BACKGROUND: The authors have reported that antioxidative effects play a crucial role in the volatile anesthetic-induced neuroprotection. Accumulated evidence shows that endogenous antioxidation could be up-regulated by nuclear factor-E2-related factor 2 through multiple pathways. However, whether nuclear factor-E2-related factor 2 activation is modulated by sevoflurane preconditioning and, if so, what is the signaling cascade underlying upstream of this activation are still unknown. METHODS: Sevoflurane preconditioning in mice was performed with sevoflurane (2...
December 30, 2016: Anesthesiology
https://www.readbyqxmd.com/read/28043500/design-and-development-of-novel-inhibitors-for-the-treatment-of-latent-tuberculosis
#7
Rudraraju Srilakshmi Reshma, Perumal Yogeeswari, Dharmarajan Sriram
OBJECTIVE/BACKGROUND: "The captain of all these men of death", is the apt sobriquet for the age-old disease tuberculosis (TB). Despite the availability of many drugs, cases of increasing resistance in the forms of multi-drug and extensively drug-resistant TB and persistence [characteristic of Mycobacterium tuberculosis (MTB)] make the eradication of TB a nightmare. Approval of bedaquiline by the Food and Drug Administration focused attention on quinoline scaffolds for development of new anti-TB agents...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28035601/epidemiological-relationships-of-campylobacter-jejuni-strains-isolated-from-humans-and-chickens-in-south-korea
#8
Jae-Young Oh, Yong-Kuk Kwon, Bai Wei, Hyung-Kwan Jang, Suk-Kyung Lim, Cheon-Hyeon Kim, Suk-Chan Jung, Min-Su Kang
Thirty-nine human isolates of Campylobacter jejuni obtained from a national university hospital during 2007-2010 and 38 chicken isolates of C. jejuni were collected from poultry farms during 2009-2010 in South Korea were used in this study. Campylobacter genomic species and virulence-associated genes were identified by PCR. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were performed to compare their genetic relationships. All isolates were highly resistant to ciprofloxacin, nalidixic acid, and tetracycline...
January 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28033700/brucellosis-with-multi-organ-involvement-in-a-patient-with-history-of-composite-aortic-graft-and-hepatitis-b
#9
Seyed Ali Dehghan Manshadi, Omid Rezahosseini, Zahra Abdi Liaei
The brucellosis with multi-organ involvement in a patient with a history of the composite aortic graft (Bentall procedure) and Hepatitis B infection is rare. A 35-year-old man presented to us with fever and loss of consciousness. Four years ago, he was IDU and underwent cardiac surgery because of endocarditis. Recently lumbar spondylodiscitis was diagnosed. The Wright (1/320) and Coombs Wright tests (1/640) were positive. After CNS imaging, lumbar puncture was done. The CSF pleocytosis was lymphocyte dominant...
November 2016: Acta Medica Iranica
https://www.readbyqxmd.com/read/28031197/ciprofloxacin-mediated-mutagenesis-is-suppressed-by-subinhibitory-concentrations-of-amikacin-in-pseudomonas-aeruginosa
#10
Estela Ynés Valencia, Fernanda Esposito, Beny Spira, Jesús Blázquez, Rodrigo S Galhardo
Resistance to antibiotics is a global health problem. Activation of the SOS response, and the subsequent elevation in mutagenesis, contributes to the appearance of resistance mutations. Among currently used drugs, quinolones are the most potent inducers of the SOS response. In the present study, we show that amikacin inhibits ciprofloxacin-mediated SOS induction and mutagenesis in Pseudomonas aeruginosa.
December 28, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28027794/intraperitoneal-vancomycin-plus-either-oral-moxifloxacin-or-intraperitoneal-ceftazidime-for-the-treatment-of-peritoneal-dialysis-related-peritonitis-a-randomized-controlled-pilot%C3%A2-study
#11
Rong Xu, Zhikai Yang, Zhen Qu, Huan Wang, Xue Tian, David W Johnson, Jie Dong
BACKGROUND: Intraperitoneal administration of antibiotics is recommended as a first treatment for managing peritoneal dialysis (PD)-related peritonitis. However, the efficacy of oral administration of quinolones has not been well studied. STUDY DESIGN: Randomized controlled pilot study. SETTING & PARTICIPANTS: 80 eligible patients with PD-related peritonitis from Peking University First Hospital (40 in each arm). INTERVENTION: Intraperitoneal vancomycin, 1g, every 5 days plus oral moxifloxacin, 400mg, every day (treatment group) versus intraperitoneal vancomycin, 1g, every 5 days plus intraperitoneal ceftazidime, 1g, every day (control group)...
December 24, 2016: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28018312/enzyme-mediated-quenching-of-the-pseudomonas-quinolone-signal-pqs-promotes-biofilm-formation-of-pseudomonas-aeruginosa-by-increasing-iron-availability
#12
Beatrix Tettmann, Christine Niewerth, Frank Kirschhöfer, Anke Neidig, Andreas Dötsch, Gerald Brenner-Weiss, Susanne Fetzner, Joerg Overhage
The 2-alkyl-3-hydroxy-4(1H)-quinolone 2,4-dioxygenase HodC was previously described to cleave the Pseudomonas quinolone signal, PQS, which is exclusively used in the complex quorum sensing (QS) system of Pseudomonas aeruginosa, an opportunistic pathogen employing QS to regulate virulence and biofilm development. Degradation of PQS by exogenous addition of HodC to planktonic cells of P. aeruginosa attenuated production of virulence factors, and reduced virulence in planta. However, proteolytic cleavage reduced the efficacy of HodC...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28013238/genetic-characterization-of-plasmid-mediated-quinolone-resistance-gene-qnrs2-in-pseudoalteromonas-and-shewanella-isolates-from-seawater
#13
Jing-Yi Zhao, Shu-Mei Zhao, Xiao-Dong Mu, Zijun Xiao
Three qnrS2-containing isolates of Pseudoalteromonas and Shewanella were collected from the seawater samples of Qingdao in China during 2014. They displayed resistance to ampicillin, ciprofloxacin, kanamycin, nalidixic acid and sulfamethoxazole. The qnrS2 genes were identified in the chromosomes of Pseudoalteromonas strain E8 and S16, and in a 140-kb plasmid in Shewanella strain S14, respectively. In addition, two copies of qnrS2 were identified in the strain E8. Sequence analyses revealed that there was an identical DNA segment located in the downstream of qnrS2 in strain S14 and E8, coding for a TetR transcriptional regulator, two putative integrases and a hypothetical protein...
December 23, 2016: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28011969/comparison-of-quinolone-and-beta-lactam-resistance-among-escherichia-coli-strains-isolated-from-urinary-tract-infections
#14
Zahra Tayebi, Hamid Heidari, Hossein Kazemian, Seyed Mohammad Ghafoori, Shahram Boroumandi, Hamidreza Houri
The growing frequency of antibiotic resistances is now a universal problem. Increasing resistance to new generations of β-lactam and quinolone antibiotics in multidrug-resistant Enterobacteriaceae isolates is considered an emergency health issue worldwide. The aim of this study was to evaluate plasmid-mediated quinolone resistance genes in ESBL-producing Escherichia coli isolated from urinary tract infections (UTIs). In our study ESBL-producing isolates were assessed by screening methods. After determination of antimicrobial susceptibility testing, detection of ESBLs and quinolone resistance genes was performed...
1, 2016: Le Infezioni in Medicina
https://www.readbyqxmd.com/read/28011210/synergistic-antibacterial-effect-of-bi2s3-nanospheres-combined-with-ineffective-antibiotic-gentamicin-against-methicillin-resistant-staphylococcus-aureus
#15
Lulu Ma, Jie Wu, Shilei Wang, Hao Yang, Donghui Liang, Zhong Lu
In this paper, Bi2S3 nanospheres with size of 212nm were prepared by a simple hydrothermal process. The selectively enhanced antibacterial effects of Bi2S3 nanospheres with three classes of ineffective antibiotics, β-lactam (cefuroxime, CXM; cefotaxime, CTX and piperacillin, PIP), quinolone (ciprofloxacin, CIP) and aminoglycoside (gentamicin, GEN) against clinical isolated methicillin-resistant Staphylococcus aureus (MRSA) were investigated for the first time. GEN shows significantly synergistic growth inhibition against MRSA when combined with Bi2S3 nanospheres, while CXM, CTX, PIP and CIP do not...
December 10, 2016: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28010047/distal-and-proximal-promoters-co-regulate-pqsr-expression-in-pseudomonas-aeruginosa
#16
John M Farrow, Everett C Pesci
The ubiquitous bacterium Pseudomonas aeruginosa is an opportunistic pathogen that can cause serious infections in immunocompromised individuals. P. aeruginosa virulence is controlled partly by intercellular communication, and the transcription factor PqsR is a necessary component in the P. aeruginosa cell-to-cell signaling network. PqsR acts as the receptor for the Pseudomonas quinolone signal, and it controls the production of 2-alkyl-4-quinolone molecules which are important for pathogenicity. Previous studies showed that the expression of pqsR is positively controlled by the quorum-sensing regulator LasR, but it was unclear how LasR is able to induce pqsR transcription...
December 23, 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/28009252/structural-basis-for-the-inhibition-of-recbcd-by-gam-and-its-synergistic-antibacterial-effect-with-quinolones
#17
Martin Wilkinson, Lucy Troman, Wan Ak Wan Nur Ismah, Yuriy Chaban, Matthew B Avison, Mark S Dillingham, Dale B Wigley
Our previous paper (Wilkinson et al, 2016) used high-resolution cryo-electron microscopy to solve the structure of the Escherichia coli RecBCD complex, which acts in both the repair of double-stranded DNA breaks and the degradation of bacteriophage DNA. To counteract the latter activity, bacteriophage λ encodes a small protein inhibitor called Gam that binds to RecBCD and inactivates the complex. Here, we show that Gam inhibits RecBCD by competing at the DNA-binding site. The interaction surface is extensive and involves molecular mimicry of the DNA substrate...
December 23, 2016: ELife
https://www.readbyqxmd.com/read/28009105/prevalence-and-antimicrobial-resistance-of-salmonella-enterica-serovar-indiana-in-china-1984-2016
#18
REVIEW
J Gong, P Kelly, C Wang
Salmonella enterica serovar Indiana, first described in 1955, is generally regarded as having a low frequency worldwide with outbreaks of gastroenteritis and abortions described in North America and Europe. In China, S. Indiana was first reported in 1984 and in the subsequent 71 surveys in 35 cities/municipalities from 18 provinces, 70% of which were after 2012, S. Indiana has been shown to have become widely prevalent in people, animals, food and the environment around abattoirs and meat processing facilities...
December 23, 2016: Zoonoses and Public Health
https://www.readbyqxmd.com/read/28003592/antibiotic-susceptibilities-and-genetic-characterization-of-extended-spectrum-beta-lactamase-producing-escherichia-coli-isolated-from-stools-of-pediatric-diarrhea-patients-in-surabaya-indonesia
#19
Eddy Bagus Wasito, Katsumi Shigemura, Kayo Osawa, Alpha Fardah, Akiho Kanaida, Dadik Raharjo, K Kuntaman, Usman Hadi, Sugeng Harijono, Subijanto Marto Sudarmo, Tatsuya Nakamura, Keigo Shibayama, Masato Fujisawa, Toshiro Shirakawa
The purpose of this study was to investigate extended-spectrum beta-lactamase (ESBL)-producing E. coli isolated from pediatric (0-3 year old) diarrhea patients, as well as bacterial antibiotic susceptibilities, ESBL typing, multilocus sequence typing (MLST) typing and diarrheagenic E. coli (DEC)-typing in Surabaya, Indonesia, where this kind of survey is rarely done. ESBL-producing E. coli were detected in 18.8 % of strains. Many ESBL-producing E. coli had significantly less susceptibility to gentamicin (p<0...
December 22, 2016: Japanese Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28001397/synthesis-of-fused-pyrimidinone-and-quinolone-derivatives-in-an-automated-high-temperature-and-high-pressure-flow-reactor
#20
Jennifer Tsoung, Andrew R Bogdan, Stanislaw Kantor, Ying Wang, Manwika Charaschanya, Stevan W Djuric
Fused pyrimidinone and quinolone derivatives that are of potential interest to pharmaceutical research were synthesized within minutes in up to 96% yield in an automated Phoenix high-temperature and high-pressure continuous flow reactor. Heterocyclic scaffolds that are either hard to synthesize or require multisteps are readily accessible using a common set of reaction conditions. The use of low-boiling solvents along with the high conversions of these reactions allowed for facile workup and isolation. The methods reported herein are highly amenable for fast and efficient heterocycle synthesis as well as compound scale-ups...
January 10, 2017: Journal of Organic Chemistry
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