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https://www.readbyqxmd.com/read/27909995/solithromycin-a-novel-fluoroketolide-for-the-treatment-of-community-acquired-bacterial-pneumonia
#1
REVIEW
George G Zhanel, Erika Hartel, Heather Adam, Sheryl Zelenitsky, Michael A Zhanel, Alyssa Golden, Frank Schweizer, Bala Gorityala, Philippe R S Lagacé-Wiens, Andrew J Walkty, Alfred S Gin, Daryl J Hoban, Joseph P Lynch, James A Karlowsky
Solithromycin is a novel fluoroketolide developed in both oral and intravenous formulations to address increasing macrolide resistance in pathogens causing community-acquired bacterial pneumonia (CABP). When compared with its macrolide and ketolide predecessors, solithromycin has several structural modifications which increase its ribosomal binding and reduce its propensity to known macrolide resistance mechanisms. Solithromycin, like telithromycin, affects 50S ribosomal subunit formation and function, as well as causing frame-shift errors during translation...
December 1, 2016: Drugs
https://www.readbyqxmd.com/read/27908699/fast-methodology-for-the-determination-of-a-broad-set-of-antibiotics-and-some-of-their-metabolites-in-seafood
#2
Albert Serra-Compte, Diana Álvarez-Muñoz, Sara Rodríguez-Mozaz, Damià Barceló
The presence of antibiotics in seafood for human consumption may pose a risk for consumers. A methodology for the analysis of antibiotics in seafood based on QuEChERS (quick, easy, cheap, effective, rugged, and safe) extraction, followed by detection and quantification using liquid chromatography coupled to mass spectrometry was developed. The analytical method was evaluated for the determination of 23 antibiotics (including parent compounds and some metabolites) in fish, mussels and clams. Recoveries ranged between 30% and 70% for most of the compounds and method detection and quantification limits (MDLs and MQLs) were between 0...
November 28, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/27908240/new-fluorescent-macrolide-derivatives-for-studying-interactions-of-antibiotics-and-their-analogs-with-the-ribosomal-exit-tunnel
#3
A G Tereshchenkov, A V Shishkina, V V Karpenko, V A Chertkov, A L Konevega, P S Kasatsky, A A Bogdanov, N V Sumbatyan
Novel fluorescent derivatives of macrolide antibiotics related to tylosin bearing rhodamine, fluorescein, Alexa Fluor 488, BODIPY FL, and nitrobenzoxadiazole (NBD) residues were synthesized. The formation of complexes of these compounds with 70S E. coli ribosomes was studied by measuring the fluorescence polarization depending on the ribosome amount at constant concentration of the fluorescent substance. With the synthesized fluorescent tylosin derivatives, the dissociation constants for ribosome complexes with several known antibiotics and macrolide analogs previously obtained were determined...
October 2016: Biochemistry. Biokhimii︠a︡
https://www.readbyqxmd.com/read/27907248/mycobacterium-ulcerans-toxin-mycolactone-may-enhance-host-seeking-and-oviposition-behavior-by-aedes-aegypti-l-diptera-culicidae
#4
M L Sanders, H R Jordan, C Serewis-Pond, L Zheng, M E Benbow, P L Small, J K Tomberlin
The ecological functions of many toxins continue to remain unknown for those produced by environmental pathogens. Mycobacterium ulcerans, the causative agent of the neglected tropical disease, Buruli ulcer, produces a cytotoxic macrolide, mycolactone, whose function(s) in the environment remains elusive. Through a series of dual-choice behavior assays, we show that mycolactone may be an interkingdom cue for the yellow fever mosquito, Aedes aegypti, seeking blood-meals as well as oviposition sites. Results provide novel insight into the evolution between bacteria and potential vectors...
December 1, 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27906087/legionella-pneumonia-in-the-niagara-region-ontario-canada-a-case-series
#5
Stephanie Cargnelli, Jeff Powis, Jennifer L Y Tsang
BACKGROUND: Legionella pneumophila, a major cause of Legionnaires' disease, accounts for 2-15 % of all community-acquired pneumonia requiring hospitalization and up to 30 % of community-acquired pneumonia requiring intensive care unit admission. Early initiation of appropriate antimicrobial therapy is a crucial step in the prevention of morbidity and mortality. However, recognition of Legionnaires' disease continues to be challenging because of its nonspecific clinical features. We sought to describe hospitalized community-acquired Legionnaires' disease to increase awareness of this important and potentially lethal disease...
December 1, 2016: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/27905836/invasive-pneumococcal-disease-from-a-tertiary-care-hospital-in-the-post-vaccine-era
#6
Sevgen Tanır Basaranoglu, Eda Karadag Oncel, Kubra Aykac, Yasemin Ozsurekci, Ali Bulent Cengiz, Ates Kara, Mehmet Ceyhan
A breakthrough infection occurring with 13-valent pneumococcal conjugate vaccine (PCV13) in Turkey are previously described. A breakthrough infection is defined as IPD in a child who had received ≥1 PCV-7 or PCV-13 and for which the pneumococcal isolate was a vaccine serotype. During one year period, among six patients with invasive pneumococcal infection, two patients were considered to have a vaccine failure with serotype 19F. Antibiotic resistance results were remarkable; macrolide resistance were observed in all strains except one, and high and intermediate penicillin resistance were determined in two strains...
December 1, 2016: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/27902646/macrolide-and-clindamycin-resistance-in-group-a-streptococci-isolated-from-children-with-pharyngitis
#7
Gregory P DeMuri, Alana K Sterkel, Phillip A Kubica, Megan N Duster, Kurt D Reed, Ellen R Wald
Group A streptococcus (GAS) is responsible for 15-30% of cases of acute pharyngitis in children. Macrolides such as azithromycin have become popular for treating GAS pharyngitis. We report macrolide resistance rates in a primary care setting in our geographic area over the past 5 years and discuss the implications of resistance in making treatment decisions. Throat swabs were collected from children with pharyngitis from May 2011 to May 2015 in a primary care setting in Madison, WI. Susceptibility testing was performed for erythromycin and clindamycin using the Kirby-Bauer disk diffusion method...
November 28, 2016: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/27902365/the-oral-cavities-of-healthy-infants-harbor-high-proportions-of-streptococcus-salivarius-strains-with-phenotypic-and-genotypic-resistance-to-multiple-classes-of-antibiotics
#8
Thaís H Palma, Erika Harth-Chú, Jodie Scott, Rafael N Stipp, Heike Boisvert, Mariana F Salomão, Jéssica D Theobaldo, Rosana F Possobon, Leandro C Nascimento, Jonathan W McCafferty, Lina Faller, Margaret J Duncan, Renata O Mattos-Graner
Emerging antibiotic resistance in the oropharyngeal microbiota, of which Streptococcus salivarius is a prominent species, represents a challenge for treating pediatric populations. In this study, we investigated the role of S. salivarius as a reservoir for antibiotic resistance genes (ARG) in the oral microbiota by analyzing 95 S. salivarius isolates from 22 healthy infants (2 to 16 months of age). Minimum inhibitory concentrations (MIC) of penicillin G, amoxicillin, erythromycin, tetracycline, doxycycline and streptomycin were determined...
October 24, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27899792/nature-nurtures-the-design-of-new-semi-synthetic-macrolide-antibiotics
#9
REVIEW
Prabhavathi Fernandes, Evan Martens, David Pereira
Erythromycin and its analogs are used to treat respiratory tract and other infections. The broad use of these antibiotics during the last 5 decades has led to resistance that can range from 20% to over 70% in certain parts of the world. Efforts to find macrolides that were active against macrolide-resistant strains led to the development of erythromycin analogs with alkyl-aryl side chains that mimicked the sugar side chain of 16-membered macrolides, such as tylosin. Further modifications were made to improve the potency of these molecules by removal of the cladinose sugar to obtain a smaller molecule, a modification that was learned from an older macrolide, pikromycin...
November 30, 2016: Journal of Antibiotics
https://www.readbyqxmd.com/read/27899591/modulation-of-nonsense-mediated-decay-by-rapamycin
#10
Rocio T Martinez-Nunez, Andrew Wallace, Doyle Coyne, Linnea Jansson, Miles Rush, Hanane Ennajdaoui, Sol Katzman, Joanne Bailey, Katrin Deinhardt, Tilman Sanchez-Elsner, Jeremy R Sanford
Rapamycin is a naturally occurring macrolide whose target is at the core of nutrient and stress regulation in a wide range of species. Despite well-established roles as an inhibitor of cap-dependent mRNA translation, relatively little is known about its effects on other modes of RNA processing. Here, we characterize the landscape of rapamycin-induced post-transcriptional gene regulation. Transcriptome analysis of rapamycin-treated cells reveals genome-wide changes in alternative mRNA splicing and pronounced changes in NMD-sensitive isoforms...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27897365/an-expedient-total-synthesis-of-chivosazole%C3%A2-f-an-actin-binding-antimitotic-macrolide-from-the-myxobacterium-sorangium-cellulosum
#11
Simon Williams, Jialu Jin, S B Jennifer Kan, Mungyuen Li, Lisa J Gibson, Ian Paterson
A unified strategy for the chemical synthesis of the chivosazoles is described. This strategy is based on two closely related approaches involving the late-stage installation of the isomerization-prone (2Z,4E,6Z,8E)-tetraenoate motif, and an expedient fragment-assembly procedure. The result is a highly convergent total synthesis of chivosazole F through the orchestration of three mild Pd/Cu-mediated Stille cross-coupling reactions, including the use of a one-pot, site-selective, three-component process, in combination with controlled installation of the requisite alkene geometry...
November 29, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27895643/azithromycin-attenuates-pseudomonas-induced-lung-inflammation-by-targeting-bacterial-proteins-secreted-in-the-cultured-medium
#12
Teresinha Leal, Gabriella Bergamini, François Huaux, Nadtha Panin, Sabrina Noel, Barbara Dhooghe, Jeremy B Haaf, Pierluigi Mauri, Sara Motta, Dario Di Silvestre, Paola Melotti, Claudio Sorio
BACKGROUND: Pseudomonas aeruginosa airway infections are a major cause of morbidity and mortality in patients with cystic fibrosis (CF). Azithromycin improves the related clinical outcomes, but its mechanisms of action remain poorly understood. We tested the hypothesis that azithromycin downregulates P. aeruginosa-induced pro-inflammatory responses by modifying release of bacterial proteins. METHODS: We monitored inflammatory markers in lungs of CF mutant mice and their littermate controls in response to conditioned media (CM) collected from the reference P...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27895010/mutations-associated-with-decreased-susceptibility-to-seven-antimicrobial-families-in-field-and-laboratory-derived-mycoplasma-bovis-strains
#13
Kinga M Sulyok, Zsuzsa Kreizinger, Enikő Wehmann, Inna Lysnyansky, Krisztián Bányai, Szilvia Marton, Ákos Jerzsele, Zsuzsanna Rónai, Ibolya Turcsányi, László Makrai, Szilárd Jánosi, Sára Ágnes Nagy, Miklós Gyuranecz
The molecular mechanisms of resistance to fluoroquinolones, tetracyclines, an aminocyclitol, macrolides, a lincosamide, a phenicol and pleuromutilins were investigated in Mycoplasma bovis For the identification of mutations responsible for the high minimal inhibitory concentrations (MICs) to certain antibiotics, whole genome sequencing of 35 M. bovis field isolates and 36 laboratory-derived antibiotic resistant mutants was performed. In vitro resistant mutants were selected by serial passages of M. bovis in broth medium containing subinhibitory concentrations of the antibiotics...
November 28, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27890625/pharmacological-treatment-optimization-for-stable-chronic-obstructive-pulmonary-disease-proposals-from-the-soci%C3%A3-t%C3%A3-de-pneumologie-de-langue-fran%C3%A3-aise
#14
M Zysman, F Chabot, P Devillier, B Housset, C M Panzini, N Roche
The Société de Pneumologie de Langue Française proposes a decision algorithm on long-term pharmacological COPD treatment. A working group reviewed the literature published between January 2009 and May 2016. This document lays out proposals and not guidelines. It only focuses on pharmacological treatments except vaccinations, smoking cessation treatments and oxygen therapy. Any COPD diagnosis, based on pulmonary function tests, should lead to recommend smoking cessation, vaccinations, physical activity, pulmonary rehabilitation in case of activity limitation, and short-acting bronchodilators...
November 24, 2016: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/27890614/structural-insights-into-the-binding-of-lauric-acid-to-cyp107l2-from-streptomyces-avermitilis
#15
Songhee Han, Tan-Viet Pham, Joo-Hwan Kim, Young-Ran Lim, Hyoung-Goo Park, Dabin Jeong, Chul-Ho Yun, Young-Jin Chun, Lin-Woo Kang, Donghak Kim
Streptomyces avermitilis is an actinobacterium known to produce clinically useful macrolides including avermectins. CYP107L2 from S. avermitilis shares a high sequence similarity with the PikC (CYP107L1) from S. venezuelae. To elucidate the structural features of CYP107L2, we conducted biochemical and structural characterization of CYP107L2 from S. avermitilis. The CYP107L2 gene was cloned, and its recombinant protein was expressed and purified. The CYP107L2 showed a low-spin state of heme, and the reduced form yielded the CO difference spectra with a maximal absorption at 449 nm...
November 25, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27888123/acute-rhinosinusitis-during-hajj-season-2014-prevalence-of-bacterial-infection-and-patterns-of-antimicrobial-susceptibility
#16
Osama A Marglani, Ameen Z Alherabi, Islam R Herzallah, Faisal A Saati, Enas A Tantawy, Talal A Alandejani, Hani S Faidah, Naif A Bawazeer, Abdullah A Marghalani, Tariq A Madani
BACKGROUND: The presence of large number of pilgrims during Hajj in Makkah region increases the risk of respiratory diseases. In this study, we aimed to assess the bacteriology of acute rhinosinusitis (ARS) during Hajj season and to demonstrate the antimicrobial susceptibility patterns that should guide the clinicians towards more appropriate antibiotic use. METHODS: Patients with ARS presenting during Hajj season of 2014 were prospectively enrolled. According to EPOS2012 criteria...
November 23, 2016: Travel Medicine and Infectious Disease
https://www.readbyqxmd.com/read/27886775/a-simple-fast-and-sensitive-screening-lc-esi-ms-ms-method-for-antibiotics-in-fish
#17
Letícia Rocha Guidi, Flávio Alves Santos, Ana Cláudia S R Ribeiro, Christian Fernandes, Luiza H M Silva, Maria Beatriz A Gloria
The objective of this study was to develop and validate a fast, sensitive and simple liquid chromatography-electrospray ionization-tandem mass spectrometry (LC-ESI-MS/MS) method for the screening of six classes of antibiotics (aminoglycosides, beta-lactams, macrolides, quinolones, sulfonamides and tetracyclines) in fish. Samples were extracted with trichloroacetic acid. LC separation was achieved on a Zorbax Eclipse XDB C18 column and gradient elution using 0.1% heptafluorobutyric acid in water and acetonitrile as mobile phase...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27886034/antibiotic-resistance-profiles-of-campylobacter-species-in-the-south-africa-private-health-care-sector
#18
Christiana O Shobo, Linda Antionette Bester, Sooraj Baijnath, Anou M Somboro, Abdool K C Peer, Sabiha Y Essack
INTRODUCTION: There is a dearth of surveillance data on clinical Campylobacter in South Africa, particularly in the private healthcare environment. We investigated the prevalence of resistance to first-line antibiotics used to treat campylobacterioses in clinical Campylobacter isolates from a private pathology laboratory. METHODOLOGY: Identification of the Campylobacter specific genes were confirmed by PCR. Minimum inhibitory concentrations were determined using the broth micro-dilution method against macrolides (erythromycin, azithromycin), fluoroquinolones (ciprofloxacin, gatifloxacin) and tetracycline...
November 24, 2016: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/27885928/epoch-making-milestones-in-antibiotic-exploratory-researches-in-japan
#19
Kunimoto Hotta
Professor Satoshi Ōmura was awarded the 2015 Nobel Prize in Physiology or Medicine. He is the third to win the award for research on antibiotic, following Fleming' (UK, 1945, discovery of penicillin) and Waksman (USA, 1952, discovery of streptomycin), and the second person after Waksman to receive the award for research on actinomycetes. By focusing his research on macrolides stemming from leucomycin research rather than β-lactams like penicillin or aminoglycosides like streptomycin, Prof. Ōmura realized many scientific achievements...
January 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/27883234/stereospecific-synthesis-of-fluoroalkenes-by-silver-mediated-fluorination-of-functionalized-alkenylstannanes
#20
Alois Fürstner, Heiko Sommer
The known procedures for the conversion of alkenylstannanes into the corresponding fluoroalkenes suffer from largely variable yields and a limited compatibility with functional groups; most notably, protodestannation becomes a serious issue whenever protic sites are present in the substrate. Outlined in this paper is a convenient alternative with a much improved application profile, which is largely unperturbed by free alcohols and amides of all sorts. Key to success is the use of F-TEDA-PF6 in combination with non-hygroscopic and bench-stable silver phosphinate (AgOP(O)Ph2) that acts as an essentially neutral, non-nucleophilic promotor and effective tin-scavenger at the same time...
November 24, 2016: Chemistry: a European Journal
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