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https://www.readbyqxmd.com/read/29784074/effects-of-fenbendazole-impregnated-feed-and-topical-moxidectin-during-quarantine-on-the-gut-microbiota-of-c57bl-6-mice
#1
Scott W Korte, Craig L Franklin, Rebecca A Dorfmeyer, Aaron C Ericsson
To protect the biosecurity of research rodent colonies, research institutions frequently require a quarantine period for live animals transferred into their facilities. Quarantine practices often include antibiotic and antiparasitic treatment with drugs such as fenbendazole and macrolide lactones. The influence of these compounds on the resident gut microbiota of mice is unknown, and any effects might subsequently affect model reproducibility. To test the influence of standard quarantine procedures on the composition of the microbiota, C57BL/6 mice, purchased from 2 different commercial suppliers, were randomly assigned to treatment groups (n = 12) by vendor and treated with fenbendazole-supplemented feed, topical moxidectin, both treatments, or no treatment (control), according to our institution's standard treatment regimen and duration...
May 1, 2018: Journal of the American Association for Laboratory Animal Science: JAALAS
https://www.readbyqxmd.com/read/29782954/comparison-between-disk-diffusion-and-agar-dilution-methods-to-determine-in-vitro-susceptibility-of-corynebacterium-spp-clinical-isolates-and-update-of-their-susceptibility
#2
Claudia Barberis, Eugenia Sandoval, Carlos Hernán Rodriguez, María Soledad Ramírez, Angela Famiglietti, Marisa Almuzara, Carlos Vay
INTRODUCTION: Although Corynebacterium species are part of the skin and mucous membranes microbiota, human infections caused by Corynebacterium spp. have been reported and the multidrug resistance pattern of the recovered isolates was emphasized. Due to the usefulness of disk diffusion in daily practice, the purpose of this work was to compare disk diffusion against agar dilution to determine disk diffusion breakpoints and to review the antimicrobial susceptibility of the most frequent Corynebacterium spp...
May 18, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29780512/iriomoteolides-novel-chemical-tools-to-study-actin-dynamics
#3
A Unzue, R Cribiú, M M Hoffman, T Knehans, K Lafleur, A Caflisch, C Nevado
Despite its promising biological profile, the cellular targets of iriomoteolide-3a, a novel 15-membered macrolide isolated from Amphidinium sp., have remained unknown. A small library of non-natural iriomoteolide-3a analogues is presented here as a result of a novel, highly convergent, catalysis-based scaffold-diversification campaign, which revealed the suitable sites for chemical editing in the original core. We provide compelling experimental evidence for actin as one of iriomoteolides' primary cellular targets, establishing the ability of these secondary metabolites to inhibit cell migration, induce severe morphological changes in cells and cause a reversible cytoplasmic retraction and reduction of F-actin fibers in a time and dose dependent manner...
April 21, 2018: Chemical Science
https://www.readbyqxmd.com/read/29778191/antimicrobial-susceptibility-and-genetic-relatedness-of-respiratory-tract-pathogens-in-weaner-pigs-over-a-12-month-period
#4
Lisa Niemann, Petra Müller, Jasmin Brauns, Rolf Nathaus, Franziska Schäkel, Kerstin Kipschull, Doris Höltig, Michael Wendt, Stefan Schwarz, Kristina Kadlec
The collaboration project VASIB aims at reducing the antibiotic consumption in pig production by integrating information from consulting expertise in clinical inspection, hygiene, epidemiology, microbiology and pharmacology. In this VASIB subproject, we investigated the antimicrobial susceptibility and relatedness of porcine respiratory tract pathogens. Bordetella bronchiseptica (n = 47), Pasteurella multocida (n = 18) and Streptococcus suis (n = 58) were obtained from weaner pigs at two farms. Antimicrobial susceptibility testing was performed by broth microdilution according to CLSI standards...
June 2018: Veterinary Microbiology
https://www.readbyqxmd.com/read/29777830/occurrence-spatial-distribution-and-seasonal-variation-of-emerging-trace-organic-pollutants-in-source-water-for-shanghai-china
#5
Sainan Sun, Yanan Chen, Yujin Lin, Dong An
The long-term low concentrations of trace "contaminants of emerging concern" (CECs) can have potential toxic effects on human health and serious risks to the ecological environment. This study investigated the occurrence, spatial distributions, and seasonal variations of 65 target CECs, including 35 pesticides, 17 antibiotics, 7 microcystins, 5 estrogens, and 1 plasticizers in Shanghai's source water. The detected pesticides and antibiotics of sulfonamides and macrolides were relatively ubiquitous in source water of Shanghai, with levels decreasing in the following order: pesticides (average (avg...
May 16, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29773092/preliminary-study-on-drug-susceptibility-profile-and-resistance-mechanisms-to-macrolides-of-clinical-isolates-of-non-tuberculous-mycobacteria-from-china
#6
Fu Li, Gui Lian Li, Hui Pang, Hai Can Liu, Tong Yang Xiao, Shuang Jun Li, Qiao Luo, Yi Jiang, Rui Bai Wang, Kang Lin Wan
OBJECTIVE: Macrolide susceptibility and drug resistance mechanisms of clinical non-tuberculous mycobacteria (NTM) isolates were preliminarily investigated for more accurate diagnosis and treatment of the infection in China. METHODS: Four macrolides, including clarithromycin (CLAR), azithromycin (AZM), roxithromycin (ROX), and erythromycin (ERY), were used to test the drug susceptibility of 310 clinical NTM isolates from six provinces of China with the broth microdilution method...
April 2018: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29771095/-a-progress-of-macrolides-therapy-for-chronic-rhinosinusitis
#7
REVIEW
S Shen, C S Wang
Macrolides are a type of antibiotics with macrocyclic lactone ring, which have been commonly used in the treatment of diffuse panbronchiolitis, chronic obstructive pulmonary disease, bronchial asthma, cystic fibrosis and other diseases. Macrolides not only have effect on antibacterial, but also effect on anti-inflammatory and immunoregulation. Chronic rhinosinusitis (CRS) is a common disease entity of infectious and inflammatory diseases that involved in nasal cavity and nasal sinuses, with various clinical phenotypes...
May 2018: Journal of Clinical Otorhinolaryngology, Head, and Neck Surgery
https://www.readbyqxmd.com/read/29770902/high-isolation-rate-and-multidrug-resistance-tendency-of-penicillin-susceptible-group-b-streptococcus-with-reduced-ceftibuten-susceptibility-in-japan
#8
Hirotsugu Banno, Kouji Kimura, Tomomi Seki, Wanchun Jin, Jun-Ichi Wachino, Keiko Yamada, Noriyuki Nagano, Yoshichika Arakawa
Group B Streptococcus (GBS) clinical isolates with reduced penicillin susceptibility (PRGBS) have emerged through acquisition of amino acid substitutions in penicillin-binding protein 2X (PBP2X). Moreover, we also reported the emergence of penicillin-susceptible GBS clinical isolates with reduced ceftibuten susceptibility (CTBr PSGBS) due to amino acid substitutions in PBPs. However, whether or not these amino acid substitutions are responsible for the reduced ceftibuten susceptibility (RCTBS) profile remains unclear...
May 17, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29762038/total-synthesis-of-the-marine-macrolide-amphidinolide-f
#9
Laurent Ferrié, Johan Fenneteau, Bruno Figadère
A new and efficient convergent approach toward the synthesis of amphidinolide F is described through the assembly of three fragments. The two trans-tetrahydrofurans were built by a diastereoselective C-glycosylation with titanium enolate of bulky N-acetyloxazolidinethiones. The side chain was inserted by a Liebeskind-Srogl cross-coupling reaction. A sulfone condensation/desulfonylation sequence, a Stille cross-coupling, and a macrolactonization were applied to connect the fragments.
May 15, 2018: Organic Letters
https://www.readbyqxmd.com/read/29761214/analysis-of-resistance-genes-of-clinical-pannonibacter-phragmitetus-strain-31801-by-complete-genome-sequencing
#10
De-Song Ming, Qing-Qing Chen, Xiao-Tin Chen
To clarify the resistance mechanisms of Pannonibacter phragmitetus 31801, isolated from the blood of a liver abscess patient, at the genomic level, we performed whole genomic sequencing using a PacBio RS II single-molecule real-time long-read sequencer. Bioinformatic analysis of the resulting sequence was then carried out to identify any possible resistance genes. Analyses included Basic Local Alignment Search Tool searches against the Antibiotic Resistance Genes Database, ResFinder analysis of the genome sequence, and Resistance Gene Identifier analysis within the Comprehensive Antibiotic Resistance Database...
May 14, 2018: Archives of Microbiology
https://www.readbyqxmd.com/read/29757980/determination-of-ten-macrolide-drugs-in-environmental-water-using-molecularly-imprinted-solid-phase-extraction-coupled-with-liquid-chromatography-tandem-mass-spectrometry
#11
Xuqin Song, Tong Zhou, Jiufeng Li, Meiyu Zhang, Jingmeng Xie, Limin He
With the extensive application of antibiotics in livestock, their contamination of the aquatic environment has received more attention. Molecularly imprinted polymer (MIP), as an eco-friendly and durable solid-phase extraction material, has shown great potential for the separation and enrichment of antibiotics in water. This study aims at developing a practical and economical method based on molecularly imprinted solid phase extraction (MISPE) combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS) for simultaneously detecting ten macrolide drugs in different sources of water samples...
May 14, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29757237/investigation-of-the-anti-prostate-cancer-properties-of-marine-derived-compounds
#12
REVIEW
Meiqi Fan, Amit Kumar Nath, Yujiao Tang, Young-Jin Choi, Trishna Debnath, Eun-Ju Choi, Eun-Kyung Kim
This review focuses on marine compounds with anti-prostate cancer properties. Marine species are unique and have great potential for the discovery of anticancer drugs. Marine sources are taxonomically diverse and include bacteria, cyanobacteria, fungi, algae, and mangroves. Marine-derived compounds, including nucleotides, amides, quinones, polyethers, and peptides are biologically active compounds isolated from marine organisms such as sponges, ascidians, gorgonians, soft corals, and bryozoans, including those mentioned above...
May 12, 2018: Marine Drugs
https://www.readbyqxmd.com/read/29755920/patterns-of-chemical-diversity-in-the-marine-ascidian-phallusia-spp-anti-tumor-activity-and-metabolic-pathway-inhibiting-steroid-biosynthesis
#13
Satheesh Kumar Palanisamy, Velusamy Arumugam, Magesh D Peter, Umamaheswari Sundaresan
The complex nature of marine biodiversity is partially responsible for the lack of studies in Indian ascidian species, which often target a small number of novel biomolecules. We performed untargeted metabolomics using gas chromatography-mass spectrometry (GC-MS) in two invasive ascidian species to investigate the inter-specific chemical diversity of Phallusia nigra and P. arabica in search of drug-like properties and metabolic pathways. The chemical profiling of individual ascidian species was obtained using GC-MS, and the metabolites were determined by searching in NIST library and literature data...
May 2018: 3 Biotech
https://www.readbyqxmd.com/read/29751897/a-strategy-for-untargeted-screening-of-macrolides-and-metabolites-in-bass-by-liquid-chromatography-coupled-to-quadrupole-orbitrap-mass-spectrometry
#14
Wei Jia, Lin Shi, Xiaogang Chu, James Chang, Ying Chen, Feng Zhang
An analytical method for the non-target screening of macrolides and metabolites in bass (Lateolabrax) was developed using an automated on-line extraction procedure followed by ultrahigh-performance liquid chromatography coupled to electrospray ionization quadrupole Orbitrap high-resolution mass spectrometry (UHPLC Q-Orbitrap). The estimated performance characteristics were satisfied, complying with the requirements of the guidelines specified in European Commission Decision 2002/657/EC. The decision limit ranged from 0...
October 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29751244/behavior-of-tetracycline-and-macrolide-antibiotics-in-activated-sludge-process-and-their-subsequent-removal-during-sludge-reduction-by-ozone
#15
Lu Wang, Weiwei Ben, Yangang Li, Chao Liu, Zhimin Qiang
Ozonation is a promising means for the reduction of excess sludge in wastewater treatment plants. However, little information is available on the removal of antibiotics during sludge ozonation. Therefore, this study investigated first the behavior of four commonly-used hydrophobic antibiotics, including three tetracyclines (tetracycline, oxytetracycline, and doxycycline) and one macrolide (azithromycin) in activated sludge process and then their removal during sludge reduction by ozone. Results indicate that the studied antibiotics were primarily transferred into the solid phase of activated sludge via sorption, which was a reversible, spontaneous, and exothermic process governed by surface reactions...
May 3, 2018: Chemosphere
https://www.readbyqxmd.com/read/29749357/-mycoplasma-pneumoniae-a-significant-but-underrated-pathogen-in-paediatric-community-acquired-lower-respiratory-tract-infections
#16
REVIEW
Surinder Kumar
Lower respiratory tract infections are considered a common cause responsible for morbidity and mortality among children, and Mycoplasma pneumoniae is identified to be responsible for up to 40 per cent of community-acquired pneumonia in children greater than five years of age. Extrapulmonary manifestations have been reported either due to spread of infection or autoimmune mechanisms. Infection by M. pneumoniae has high incidence and clinical importance but is still an underrated disease. Most widely used serologic methods are enzyme immunoassays for detection of immunoglobulin M (IgM), IgG and IgA antibodies to M...
January 2018: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/29746693/requests-for-new-oral-antibiotic-prescriptions-in-children-within-2-days-a-norwegian-population-based-study
#17
E H Bergene, H Nordeng, T B Rø, A Steinsbekk
Background: Children commonly refuse to take antibiotics, which may induce parents to request new antibiotic prescriptions with different pharmaceutical characteristics. Objectives: To investigate prescription changes for children 0-12 years receiving oral liquid or solid antibiotic formulations and to explore the relationships between prescription changes and characteristics related to the child, prescriber and antibiotic. Methods: A population-based registry study based on data from the Norwegian Prescription Database (NorPD) from 2004 to 2016...
May 9, 2018: Family Practice
https://www.readbyqxmd.com/read/29743095/roxithromycin-monotherapy-inducing-a-partial-response-in-a-patient-with-myeloma-a-case-report
#18
Kern Y Chai, Anna L Byrne, Ian M Morison
BACKGROUND: Clarithromycin is an efficacious treatment for myeloma in combination with other anti-myeloma therapy but not as monotherapy. To date, all studies have focused on a clarithromycin-specific effect rather than a class effect (macrolide) and there is no information on the activity of roxithromycin in myeloma. CASE PRESENTATION: Here we report an untreated 86-year-old New Zealand European white man with IgA myeloma whose paraprotein decreased by 57%, consistent with a partial response, after a course of roxithromycin for pneumonia...
May 10, 2018: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/29741104/two-new-12-membered-macrolides-from-the-endophytic-fungal-strain-cladosprium-colocasiae-a801-of-callistemon-viminalis
#19
Hong-Xin Liu, Hai-Bo Tan, Sai-Ni Li, Yu-Chan Chen, Hao-Hua Li, Sheng-Xiang Qiu, Wei-Min Zhang
Two new polyketide metabolites, the 12-membered macrolides 4-hydroxy-12-methyloxacyclododecane-2,5,6-trione (1) and 12-methyloxacyclododecane-2,5,6-trione (2), were isolated from the endophytic fungal strain Cladosprium colocasiae A801 of the plant Callistemon viminalis, together with five known derivatives. Their structures were fully characterized by means of detailed spectroscopic analysis for new structures, and in comparison with published data for known compounds. The antibacterial, cytotoxic, and α-glucosidase inhibitory activities of the new compounds 1 and 2 were evaluated...
May 9, 2018: Journal of Asian Natural Products Research
https://www.readbyqxmd.com/read/29738765/the-crystal-structure-of-p450-tt-heme-domain-provides-the-first-structural-insights-into-the-versatile-class-vii-p450s
#20
Michele Tavanti, Joanne L Porter, Colin W Levy, J Rubén Gómez Castellanos, Sabine L Flitsch, Nicholas J Turner
The first crystal structure of a class VII P450, CYP116B46 from Tepidiphilus thermophilus, has been solved at 1.8 Å resolution. The structure reveals overall conservation of the P450-fold and a water conduit around the I-helix. Active site residues have been identified and sequence comparisons have been made with other class VII enzymes. A structure similarity search demonstrated that the P450-TT structure is similar to enzymes capable of oxy-functionalization of fatty acids, terpenes, macrolides, steroids and statins...
May 5, 2018: Biochemical and Biophysical Research Communications
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