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Quinolone

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https://www.readbyqxmd.com/read/28324670/relationship-of-antibiotic-treatment-to-recovery-after-acute-fev1-decline-in-children-with-cystic-fibrosis
#1
Wayne J Morgan, Jeffrey S Wagener, David J Pasta, Stefanie J Millar, Donald R VanDevanter, Michael W Konstan
RATIONALE: Children with cystic fibrosis often suffer acute declines in lung function. We previously showed that such declines are not always treated with antibiotics, but did not assess whether treatment improves the likelihood of recovery. OBJECTIVES: To determine whether new antibiotic treatment was associated with recovery from acute FEV1 decline. METHODS: We studied episodes of FEV1 decline (≥10% from baseline) from the Epidemiologic Study of Cystic Fibrosis...
March 21, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28318003/small-molecule-hedgehog-pathway-antagonists
#2
Trieu N Trinh, Eileen A McLaughlin, Christopher P Gordon, Ilana R Bernstein, Victoria J Pye, Kate A Redgrove, Adam McCluskey
Leveraging our quinolone-1-(2H)-one based Hedgehog signalling pathway (HSP) inhibitors we have developed two new classes of HSP inhibitors based on: l-tryptophan and benzo[1,3]dioxol-5-ylmethyl-[2-(1H-indol-3-yl)-ethyl]-amine. Synthesis of focused compound libraries identified six l-tryptophan based inhibitors, and two stimulators, of Gli at 10 μM compound concentration. 2,4-Dichloro-13 and indole 16 suppressed mRNA expression of Ptch1 in Shh LIGHT2 cells, with 13 suppressing and 16 stimulating Gli2 mRNA expression...
March 20, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28317169/molecular-characteristics-of-ofloxacin-mono-resistant-mycobacterium-tuberculosis-isolates-from-new-and-previously-treated-tuberculosis-patients
#3
Zhirui Wang, Tong Xie, Cheng Mu, Chunhua Wang, Hanfang Ju, Hui Zhao, Rui Sun
BACKGROUND: Ofloxacin (OFX) resistant Mycobacterium tuberculosis (MTB) isolates have been increasingly observed and are a major concern in recent years. This study investigated the genetic mutations associated with OFX resistance among clinical OFX mono-resistant MTB isolates from new and previously treated tuberculosis patients. METHODS: A total of 50 unrelated OFX mono-resistant MTB isolates were analyzed. For all isolates, the quinolone resistance determining regions of gyrA and gyrB were PCR amplified and sequenced...
March 20, 2017: Journal of Clinical Laboratory Analysis
https://www.readbyqxmd.com/read/28316051/pathogenic-multiple-antimicrobial-resistant-escherichia-coli-serotypes-in-recreational-waters-of-mumbai-india-a-potential-public-health-risk
#4
Aayushi Maloo, Abhay B Fulke, Najmuddin Mulani, Soniya Sukumaran, Anirudh Ram
Globally, coastal waters have emerged into a pool of antibiotic resistance genes and multiple antibiotic resistant microorganisms, and pathogenicity of these resistant microorganisms in terms of serotypes and virulence genes has made the environment vulnerable. The current study underscores the presence of multiple antibiotic resistant pathogenic serotypes and pathotypes of Escherichia coli, the predominant faecal indicator bacteria (FIB), in surface water and sediment samples of famous recreational beaches (Juhu, Versova, Mahim, Dadar, and Girgaon) of Mumbai...
March 18, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28314077/comparative-subproteomic-analysis-of-clinically-acquired-fluoroquinolone-resistance-and-ciprofloxacin-stress-in-salmonella-typhimurium-dt104b
#5
Susana Correia, Michel Hébraud, Ingrid Chafsey, Christophe Chambon, Didier Viala, Yolanda Sáenz, José Luis Capelo, Patrícia Poeta, Gilberto Igrejas
PURPOSE: Antimicrobial resistance is a worldwide public health threat and Salmonella enterica subsp. enterica serotype Typhimurium phage type DT104B multiresistant strains with additional quinolone resistance have been responsible for global outbreaks and high mortality. Quinolone resistance is known to be multifactorial but is still far from a complete understanding. To give new insights about the resistance mechanisms involved, this work aimed to evaluate subproteome changes between a S...
March 17, 2017: Proteomics. Clinical Applications
https://www.readbyqxmd.com/read/28304213/characterization-of-the-genetic-environment-of-the-blaveb-4-gene-associated-with-a-transposable-region-in-a-proteus-mirabilis-clinical-isolate
#6
Paula Espinal, Elisenda Miró, Laia Ramoneda, Manel Flores, Alba Rivera, Pere Coll, Ferran Navarro
Proteus mirabilis is the second most common cause of urinary tract infections and is also an important cause of nosocomial infections. TEM-type and CTX-M-type extended-spectrum β-lactamases (ESBLs) are the most widely distributed in this bacterial species, but minor ESBLs such as the VEB-type have also been identified. The aim of this study was to analyze the genetic environment of the blaVEB-4 gene found in a P. mirabilis clinical isolate recovered in Spain. P. mirabilis N2231 showed resistance to penicillins, cephalosporins, and aminoglycosides, remaining susceptible to imipenem, cefoxitin, β-lactamases inhibitors, and quinolones...
March 17, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28304162/rational-design-synthesis-and-biological-evaluation-of-heterocyclic-quinolones-targeting-the-respiratory-chain-of-mycobacterium-tuberculosis
#7
Weiqian David Hong, Peter D Gibbons, Suet C Leung, Richard Amewu, Paul A Stocks, Andrew Valentine Stachulski, Pedro C Horta, Maria Lurdes Santos Cristiano, Alison E Shone, Darren Moss, Alison Ardrey, Raman Sharma, Ashley J Warman, Paul T P Bedingfield, Nicholas E Fisher, Ghaith Aljayyoussi, Sally Mead, Maxine Caws, Neil G Berry, Stephen A Ward, Giancarlo A Biagini, Paul M O'Neill, Gemma Louise Nixon
A High-throughput screen (HTS) was undertaken against the respiratory chain dehydrogenase component, NADH:menaquinone oxidoreductase (Ndh) of Mycobacterium tuberculosis (Mtb). 11,000 compounds were selected for the HTS based on the known phenothiazine Ndh inhibitors, trifluoperazine and thioridazine. Combined HTS (11,000 compounds) and in-house screening of a limited number of quinolones (50 compounds) identified ~100 hits and four distinct chemotypes, the most promising of which contained the quinolone core...
March 17, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28303985/pattern-of-antimicrobial-drug-resistance-of-salmonella-typhi-and-paratyphi-a-in-a-teaching-hospital-in-islamabad
#8
Azmat Ali, Hafiz Awais Ali, Fazal Hussain Shah, Arslan Zahid, Hina Aslam, Benazir Javed
OBJECTIVE: To see the pattern of antimicrobial drug resistance among Salmonella serovars. METHODS: This longitudinal, observational study was conducted at Khan Research Laboratories Hospital, Islamabad, Pakistan, from May 2012 to December 2014. All patients presenting with typhoid fever with positive blood culture were included. Age, gender, salmonella serovar and sensitivity to 9 antimicrobial drugs were taken into account. The tested antimicrobial drugs were ampicillin, trimethoprim/sulphamethoxazole, chloramphenicol, nalidixic acid, ciprofloxacin, ofloxacin, levofloxacin, ceftriaxone and cefixime...
March 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28303388/the-impact-of-antibiotic-stewardship-programs-in-combating-quinolone-resistance-a-systematic-review-and-recommendations-for-more-efficient-interventions
#9
REVIEW
Vasiliki Pitiriga, Georgia Vrioni, George Saroglou, Athanasios Tsakris
Quinolones are among the most commonly prescribed antibiotics worldwide. A clear relationship has been demonstrated between excessive quinolone use and the steady increase in the incidence of quinolone-resistant bacterial pathogens, both in hospital and community sites. In addition, exposure to quinolones has been associated with colonization and infection with healthcare-associated pathogens such as methicillin-resistant Staphylococcus aureus and Clostridium difficile in hospitalized patients. Therefore, the management of quinolone prescribing in hospitals through antibiotic stewardship programs is considered crucial...
March 16, 2017: Advances in Therapy
https://www.readbyqxmd.com/read/28303249/a-descriptive-study-of-open-fractures-contaminated-by-seawater-infection-pathogens-and-antibiotic-resistance
#10
Hongyi Zhu, Xingwei Li, Xianyou Zheng
Aims. In this work, the main objectives were to investigate the clinical characteristics and bacterial spectrum present in open fractures contaminated by seawater. Methods. We conducted a retrospective cohort study and included all patients with open fractures from 1st January, 2012, to 31st December, 2015, in our hospital. Patients were grouped based on the presence of seawater contamination in wounds. We compared the infection rate, bacterial spectrum, and antibiotic resistance between the two groups. Results...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28303132/mycobacterium-abscessus-subsp-abscessus-is-capable-of-degrading-pseudomonas-aeruginosa-quinolone-signals
#11
Franziska S Birmes, Timo Wolf, Thomas A Kohl, Kai Rüger, Franz Bange, Jörn Kalinowski, Susanne Fetzner
Pseudomonas aeruginosa employs 2-heptyl-3-hydroxy-4(1H)-quinolone (the Pseudomonas quinolone signal, PQS) and 2-heptyl-4(1H)-quinolone (HHQ) as quorum sensing signal molecules, which contribute to a sophisticated regulatory network controlling the production of virulence factors and antimicrobials. We demonstrate that Mycobacterium abscessus(T) and clinical M. abscessus isolates are capable of degrading these alkylquinolone signals. Genome sequences of 50 clinical M. abscessus isolates indicated the presence of aqdRABC genes, contributing to fast degradation of HHQ and PQS, in M...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28299457/current-trends-of-human-infections-and-antibiotic-resistance-of-the-genus-shewanella
#12
REVIEW
K Yousfi, S Bekal, V Usongo, A Touati
Shewanella spp. are commonly known as environmental bacteria and are most frequently isolated from aquatic areas. Currently, diseases syndromes and multidrug resistance have increasingly been reported in the genus Shewanella. Some species are associated with various infections, such as skin and soft tissue infections, as well as bacteremia. Generally, these bacteria are opportunistic and mostly affect people with an impaired immune system. This genus is also a probable vehicle and progenitor of antibiotic resistance genes...
March 15, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28298441/identification-of-the-binding-sites-for-ubiquinone-and-inhibitors-in-the-na-pumping-nadh-ubiquinone-oxidoreductase-of-vibrio-cholerae-by-photoaffinity-labeling
#13
Takeshi Ito, Masatoshi Murai, Satoshi Ninokura, Yuki Kitazumi, Katherine G Mezic, Brady F Cress, Mattheos A G Koffas, Joel E Morgan, Blanca Barquera, Hideto Miyoshi
The Na(+)-pumping NADH-quinone oxidoreductase (Na(+)-NQR) is the first enzyme of the respiratory chain and the main ion transporter in many marine and pathogenic bacteria, including Vibrio cholerae The V. cholerae Na(+)-NQR has been extensively studied, but its binding sites for ubiquinone and inhibitors remain controversial. Here, using a photoreactive ubiquinone PUQ-3 as well as two aurachin-type inhibitors [(125)I]PAD-1 and [(125)I]PAD-2 and photoaffinity labeling experiments on the isolated enzyme, we demonstrate that the ubiquinone ring binds to the NqrA subunit in the regions Leu32-Met39 and Phe131-Lys138, encompassing the rear wall of a predicted ubiquinone-binding cavity...
March 15, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28289146/the-pseudomonas-aeruginosa-prrf-small-rnas-regulate-iron-homeostasis-during-acute-murine-lung-infection
#14
Alexandria A Reinhart, Angela T Nguyen, Luke K Brewer, Justin Bevere, Jace W Jones, Maureen A Kane, F Heath Damron, Mariette Barbier, Amanda G Oglesby-Sherrouse
Pseudomonas aeruginosa is a Gram-negative opportunistic pathogen that requires iron for virulence. Iron homeostasis is maintained in part by the PrrF1 and PrrF2 small RNAs, which block the expression of iron-containing proteins in iron-depleted conditions. The PrrF sRNAs also promote the production of the Pseudomonas quinolone signal, a quorum sensing molecule that activates the expression of several virulence genes. The tandem arrangement of the prrF genes allows for expression of a third sRNA, PrrH, which is predicted to regulate gene expression through its unique sequence derived from the prrF1-prrF2 intergenic sequence (the PrrH-IG sequence)...
March 13, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28287903/cytotoxic-effect-associated-with-overexpression-of-qnr-proteins-in-escherichia-coli
#15
Jesús Machuca, Paula Diaz de Alba, Esther Recacha, Álvaro Pascual, José Manuel Rodriguez-Martinez
OBJECTIVE: The objective was to evaluate the cytotoxic effect associated with overexpression of multiple Qnr-like plasmid-mediated quinolone resistance (PMQR) mechanisms in Escherichia coli. METHODS: Coding regions of different PMQR genes (qnrA1, qnrB1, qnrC, qnrD1, qnrS1, and qepA2) and efsqnr were cloned into pET29a(+) vector and overexpressed in E. coli BL21. E. coli BL21 with and without an empty pET29a(+) vector were used as controls. The cytotoxic effect associated with PMQR mechanism overexpression was determined by transmission electron microscopy and viability assays...
March 13, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28287857/assessment-of-immunomodulatory-activities-and-in-vitro-toxicity-of-new-quinolone-7-ethyl-9-ethyl-6-oxo-6-9-dihydro-1-2-5-selenadiazolo-3-4-h-quinoline-7-carboxylate
#16
Soňa Jantová, Ema Paulovičová, Lucia Paulovičová, Dominika Topoľská, Miroslav Pánik, Viktor Milata
Our previous studies on leukemia cells L1210 and cervical cancer HeLa cells revealed cytotoxic effects of the 7-ethyl 9-ethyl-6-oxo-6,9-dihydro[1,2,5]selenadiazolo[3,4-h]quinoline-7-carboxylate (E2h), a new synthetically prepared quinolone derivative, toward selected cancer cell lines. The aim of the present study was to examine the cytotoxicity of E2h toward next cell lines and tissues; that is, human cancer HL-60 and A549 cells, human non-cancer fibroblast BHNF-1 cells, and reconstructed human epidermis tissues...
March 13, 2017: Immunological Investigations
https://www.readbyqxmd.com/read/28283137/molecular-evaluation-of-high-fluoroquinolone-resistant-genes-in-endemic-cases-of-shigellosis-northeast-part-of-karnataka-india
#17
Prabhurajeshwar C, Pramod Desai, Kelmani Chandrakanth R
OBJECTIVES: Shigellosis is an acute infection of the intestine caused by bacteria in the genus Shigella and also an important cause of diarrhea in developing countries. This study was carried out to find the extent and nature of the emerging resistance in north part of Karnataka, India, and surrounding region with huge population, and also focused on the molecular mechanism of development of resistance against different generations of fluoroquinolones and explored the diversity of restriction endonucleases; we also tried to establish the significance of reduced minimal inhibitory concentrations (MIC) values...
September 2016: Annals of Global Health
https://www.readbyqxmd.com/read/28277045/antibiotic-prescribing-in-relation-to-diagnoses-and-consultation-rates-in-belgium-the-netherlands-and-sweden-use-of-european-quality-indicators
#18
Mia Tyrstrup, Alike van der Velden, Sven Engstrom, Geert Goderis, Sigvard Molstad, Theo Verheij, Samuel Coenen, Niels Adriaenssens
OBJECTIVE: To assess the quality of antibiotic prescribing in primary care in Belgium, the Netherlands and Sweden using European disease-specific antibiotic prescribing quality indicators (APQI) and taking into account the threshold to consult and national guidelines. DESIGN: A retrospective observational database study. SETTING: Routine primary health care registration networks in Belgium, the Netherlands and Sweden. SUBJECTS: All consultations for one of seven acute infections [upper respiratory tract infection (URTI), sinusitis, tonsillitis, otitis media, bronchitis, pneumonia and cystitis] and the antibiotic prescriptions in 2012 corresponding to these diagnoses...
March 3, 2017: Scandinavian Journal of Primary Health Care
https://www.readbyqxmd.com/read/28276133/plasmid-mediated-resistance-to-cephalosporins-and-quinolones-in-escherichia-coli-from-american-crows-in-the-usa
#19
Ivana Jamborova, Monika Dolejska, Ludek Zurek, Andrea K Townsend, Anne B Clark, Julie C Ellis, Ivo Papousek, Alois Cizek, Ivan Literak
American crow (Corvus brachyrhynchos) feces were tested for Escherichia coli with plasmid-mediated quinolone resistance (PMQR), extended-spectrum beta-lactamases (ESBL) and AmpC beta-lactamases. A total of 590 fecal samples were collected at four roosting sites in the USA and cultivated on selective media. Pulsed-field gel electrophoresis (PFGE) and multi-locus sequence typing (MLST) were performed to assess clonality. Transferability of resistance genes was studied using conjugation and transformation bioassays...
March 9, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28273650/bioanalysis-of-pseudomonas-aeruginosa-alkyl-quinolone-signalling-molecules-in-infected-mouse-tissue-using-lc-ms-ms-and-its-application-to-a-pharmacodynamic-evaluation-of-mvfr-inhibition
#20
Paul Turnpenny, Anthony Padfield, Patrick Barton, Joanne Teague, Laurence G Rahme, Michael J Pucci, Robert Zahler, Aileen Rubio
Alkyl quinolone molecules 2-heptyl-4-quinolone (HHQ) and 2-heptyl-3-hydroxy-4(1H)-quinolone (PQS) are important quorum sensing signals, which play a mediatory role in the pathogenesis of acute and chronic Pseudomonas aeruginosa infection. A targeted approach inhibiting the bacterial 'multiple virulence factor regulon' (MvfR) protein complex, offers the possibility to block the synthesis of MvfR-dependant signal molecules. Here, a high throughput bioanalytical method was developed using LC-MS/MS detection for the selective determination of HHQ and PQS in mouse tissue homogenate, over a sensitive range of 1-5000 and 10-5000pg/mL, respectively...
February 28, 2017: Journal of Pharmaceutical and Biomedical Analysis
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