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https://www.readbyqxmd.com/read/28102767/synthesis-stereochemical-characterization-and-antimicrobial-evaluation-of-a-potentially-nonnephrotoxic-3-c-acethydrazide-puromycin-analog
#1
Josh Carter, Blair A Weaver, Maria A Chiacchio, Amy R Messersmith, Will E Lynch, Brent D Feske, Giuseppe Gumina
Puromycin is a peptidyl nucleoside endowed with significant antibiotic and anticancer properties, but also with an unfortunate nephrotoxic character that has hampered its use as a chemotherapeutic agent. Since hydrolysis of puromycin's amide to puromycin aminonucleoside is the first metabolic step leading to nephrotoxicity, we designed a 3'-C-hydrazide analog where the nitrogen and carbon functionality around the amide carbonyl of puromycin are inverted. The title compound, synthesized in 11 steps from D-xylose, cannot be metabolized to the nephrotoxic aminonucleoside...
January 19, 2017: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/28102347/low-level-predation-by-lytic-phage-phiipla-rodi-promotes-biofilm-formation-and-triggers-the-stringent-response-in-staphylococcus-aureus
#2
Lucía Fernández, Silvia González, Ana Belén Campelo, Beatriz Martínez, Ana Rodríguez, Pilar García
An important lesson from the war on pathogenic bacteria has been the need to understand the physiological responses and evolution of natural microbial communities. Bacterial populations in the environment are generally forming biofilms subject to some level of phage predation. These multicellular communities are notoriously resistant to antimicrobials and, consequently, very difficult to eradicate. This has sparked the search for new therapeutic alternatives, including phage therapy. This study demonstrates that S...
January 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28101896/adaptation-of-genetically-monomorphic-bacteria-evolution-of-copper-resistance-through-multiple-horizontal-gene-transfers-of-complex-and-versatile-mobile-genetic-elements
#3
D Richard, V Ravigné, A Rieux, B Facon, C Boyer, K Boyer, P Grygiel, S Javegny, M Terville, B I Canteros, I Robène, C Vernière, A Chabirand, O Pruvost, P Lefeuvre
Copper-based antimicrobial compounds are widely used to control plant bacterial pathogens. Pathogens have adapted in response to this selective pressure. Xanthomonas citri pv. citri, a major citrus pathogen causing Asiatic citrus canker, was first reported to carry plasmid-encoded copper resistance in Argentina. This phenotype was conferred by the copLAB gene system. The emergence of resistant strains has since been reported in Réunion and Martinique. Using microsatellite-based genotyping and copLAB PCR, we demonstrated that the genetic structure of the copper-resistant strains from these three regions was made up of two distant clusters and varied for the detection of copLAB amplicons...
January 19, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28101785/acinetobacter-baumannii-bacteraemia-in-patients-with-haematological-malignancy-a-multicentre-retrospective-study-from-the-infection-working-party-of-jiangsu-society-of-hematology
#4
X Wang, L Zhang, A Sun, X Yang, W Sang, Y Jiang, J Cheng, J Wang, M Zhou, B Chen, J Ouyang
Acinetobacter baumannii (Ab) bacteraemia in patients with haematological malignancies is fatal but rarely reported. We explored the clinical characteristics, drug resistances and prognostic factors in these patients. This multicentre, retrospective study was conducted at the department of haematology wards of 18 tertiary hospitals in China from January 2014 to June 2015. The total clinical isolates from every source were collected from patients with haematological malignancy. Haematological malignancy patients diagnosed with Ab bacteraemia were analysed...
January 18, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28101333/behaviour-change-interventions-to-influence-antimicrobial-prescribing-a-cross-sectional-analysis-of-reports-from-uk-state-of-the-art-scientific-conferences
#5
T M Rawson, L S P Moore, A M Tivey, A Tsao, M Gilchrist, E Charani, A H Holmes
BACKGROUND: To improve the quality of antimicrobial stewardship (AMS) interventions the application of behavioural sciences supported by multidisciplinary collaboration has been recommended. We analysed major UK scientific research conferences to investigate AMS behaviour change intervention reporting. METHODS: Leading UK 2015 scientific conference abstracts for 30 clinical specialties were identified and interrogated. All AMS and/or antimicrobial resistance(AMR) abstracts were identified using validated search criteria...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28101153/upregulated-effects-of-mir-7-in-methicillin-resistant-staphylococcus-aureus
#6
Hong Zhang, Haiqing Li, Yan Liu, Qingyan Li, Yufang Bi, Guiqing Fang
The aim of the study was to investigate the characteristic function of the upregulated effects of miR-7 in methicillin-resistant Staphylococcus aureus (MRSA). After separating the MRSA in clinic, the expression of miR-7 mRNA was tested by reverse transcription polymerase chain reaction. The overexpression, inhibition of miR-7, and control group were established by plasmid in vitro. Following transfection of the bacterial strain, the effect of β-lactam antibiotics in minimum inhibitory concentration (MIC) was observed using the microporous dilution method, and antibacterial effects in vitro were observed using the dynamic growth curve method...
December 2016: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28100600/suitability-of-the-carbapenem-inactivation-method-cim-to-detect-imp-metallo-%C3%AE-lactamase-producing-enterobacteriaceae
#7
Kyoichi Saito, Ryuichi Nakano, Yuki Suzuki, Akiyo Nakano, Yoshihiko Ogawa, Shinsuke Yonekawa, Shiro Endo, Fumiko Mizuno, Kei Kasahara, Keiichi Mikasa, Mitsuo Kaku, Hisakazu Yano
Carbapenem-resistant Enterobacteriaceae (CRE) have become globally distributed in the past decade, resulting in concern over control of hospital infections and antimicrobial therapies (1. 2).….
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28100443/surveillance-of-antimicrobial-use-in-dutch-long-term-care-facilities
#8
Monique Roukens, Linda Verhoef, Ellen Stobberingh, Stephanie Natsch
OBJECTIVES: Residents living in a long-term care facility (LTCF) are more susceptible to infections. Treatment with antimicrobials is sometimes necessary; however, antibiotic use is considered one of the most important drivers of the development of antibiotic resistance. Surveillance data on antibiotic use in these LTCFs are necessary to get more insight into these patterns. The objective of this study was to describe antibiotic use in LTCFs in the Netherlands. METHODS: One hundred and seventy-seven LTCFs in the Netherlands were contacted and asked to participate in a study concerning antibiotic resistance and antibiotic use...
January 18, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28100229/surveillance-of-life-long-antibiotics-a-review-of-antibiotic-prescribing-practices-in-an-australian-healthcare-network
#9
Jillian S Y Lau, Christopher Kiss, Erika Roberts, Kylie Horne, Tony M Korman, Ian Woolley
BACKGROUND: The rise of antimicrobial use in the twentieth century has significantly reduced morbidity due to infection, however it has also brought with it the rise of increasing resistance. Some patients are on prolonged, if not "life-long" course of antibiotics. The reasons for this are varied, and include non-infectious indications. We aimed to study the characteristics of this potential source of antibiotic resistance, by exploring the antibiotic dispensing practices and describing the population of patients on long-term antibiotic therapy...
January 18, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28100194/interspecies-transfer-of-vancomycin-erythromycin-and-tetracycline-resistance-among-enterococcus-species-recovered-from-agrarian-sources
#10
M Conwell, V Daniels, P J Naughton, J S G Dooley
BACKGROUND: Enterococci are now well recognised for their ability to transfer antibiotic resistance and for their association with nosocomial infections, but less is known regarding their relevance in the wider environment. Enterococcus faecalis and Enterococcus faecium were isolated from a range of agrarian associated sources (low-flow water, septic tank, poultry litter, high flow water, slurry/soil) and were assessed for latent ability to transfer antimicrobial resistance. RESULTS: The isolates were tested for phenotypic clumping in the presence of cell-free supernatant from other isolates...
January 18, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28099089/genotypic-characterization-of-quinolone-resistant-escherichia-coli-isolates-from-retail-food-in-morocco
#11
Kaotar Nayme, Abouddihaj Barguigua, Brahim Bouchrif, Bouchra Karraouan, Fatima El Otmani, Naima Elmdaghri, Khalid Zerouali, Mohammed Timinouni
This study was conducted to assess the retail food as a possible vehicle for antimicrobial resistant, particularly quinolones resistant and pathogenic Escherichia coli. We determined the prevalence and characteristics of nalidixic acid (Nal) resistant E. coli isolates from diverse retail food samples. In all, 70 (28%) of 250 E. coli isolates studied were Nal-resistant E. coli and 91% of these were multi-drug resistant. Plasmid mediated quinolone resistance genes were identified in 32 isolates, including aac(6')-Ib-cr (n = 16), qnrS1 (n = 11) and qnrB19 (n = 7)...
February 2017: Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes
https://www.readbyqxmd.com/read/28098806/antibacterial-activities-and-possible-modes-of-action-of-acacia-nilotica-l-del-against-multidrug-resistant-escherichia-coli-and-salmonella
#12
Muhammad Bilal Sadiq, Joel Tarning, Tay Zar Aye Cho, Anil Kumar Anal
Medicinal plants are frequently used for the treatment of various infectious diseases. The objective of this study was to evaluate the antibacterial activity and mode of action of Acacia nilotica and the antibiogram patterns of foodborne and clinical strains of Escherichia coli and Salmonella. The mechanism of action of acacia extracts against E. coli and Salmonella was elucidated by observing morphological damages including cell integrity and cell membrane permeability, as well as changes in cell structures and growth patterns in kill-time experiments...
January 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28098790/synthesis-structure-and-antimicrobial-properties-of-novel-benzalkonium-chloride-analogues-with-pyridine-rings
#13
Bogumił Brycki, Izabela Małecka, Anna Koziróg, Anna Otlewska
Quaternary ammonium compounds (QACs) are a group of compounds of great economic significance. They are widely used as emulsifiers, detergents, solubilizers and corrosion inhibitors in household and industrial products. Due to their excellent antimicrobial activity QACs have also gained a special meaning as antimicrobials in hospitals, agriculture and the food industry. The main representatives of the microbiocidal QACs are the benzalkonium chlorides (BACs), which exhibit biocidal activity against most bacteria, fungi, algae and some viruses...
January 13, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28098416/motuporamine-derivatives-as-antimicrobial-agents-and-antibiotic-enhancers-against-resistant-gram-negative-bacteria
#14
Diane Borselli, Marine Blanchet, Jean-Michel Bolla, Aaron Muth, Kristen Skruber, Otto Phanstiel, Jean Michel Brunel
Dihydromotuporamine C and its derivatives were evaluated for their in vitro antimicrobial activities and antibiotic enhancement properties against Gram-negative bacteria and clinical isolates. The mechanism of action of one of these derivatives, MOTU-N44, was investigated against Enterobacter aerogenes by using fluorescent dyes to evaluate outer-membrane depolarization and permeabilization. Its efficiency correlated with inhibition of dye transport, thus suggesting that these molecules inhibit drug transporters by de-energization of the efflux pump rather than by direct interaction of the molecule with the pump...
January 18, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28098241/characterization-of-a-p1-like-bacteriophage-carrying-ctx-m-27-in-salmonella-spp-resistant-to-third-generation-cephalosporins-isolated-from-pork-in-china
#15
Ling Yang, Wan Li, Gui-Ze Jiang, Wen-Hui Zhang, Huan-Zhong Ding, Ya-Hong Liu, Zhen-Ling Zeng, Hong-Xia Jiang
The aim of this study was to elucidate the epidemiology of third generation cephalosporin resistant Samonella isolates from pork of a slaughterhouse in China and the features of transferable elements carrying blaCTX-M genes. One hundred and twenty-six (7.3%) Salmonella isolates were identified; S. Derby and S. Rissen were the most two prevalent serotypes. Among these isolates 20 (15.8%) were resistant to third generation cephalosporins and nine of them carried blaCTX-M-27. S1-PFGE and replicon typing of blaCTX-M-27-carrying plasmids showed that seven were untypeable plasmids of about 104 Kb and two were IncP plasmids of about 300 Kb...
January 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28097716/parental-knowledge-of-antibiotic-use-in-children-with-respiratory-infections-a-systematic-review
#16
REVIEW
Lourdes Cantarero-Arévalo, Mia Pavelics Hallas, Susanne Kaae
OBJECTIVE: Antimicrobial resistance (AMR) is an increasing global problem. AMR threatens the effective prevention and treatment of an ever-increasing range of infections caused by bacteria, parasites, viruses and fungi. The misuse and overuse of antibiotics (AB) is the major contributor to the emergence of resistant bacteria in humans. To present and describe characteristics in parents' knowledge about when and how to use AB for an upper respiratory tract infection (URTI), their attitudes towards doctors and AB use in general, and their behaviour when their child suffers from an URTI...
February 2017: International Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/28097645/bacterial-subversion-of-camp-signalling-inhibits-cathelicidin-expression-which-is-required-for-innate-resistance-to-mycobacterium-tuberculosis
#17
Shashank Gupta, Kathryn Winglee, Richard Gallo, William R Bishai
Antimicrobial peptides such as cathelicidins are an important component of innate immune defence against inhaled microorganisms and have demonstrated antimicrobial activity against Mycobacterium tuberculosis with in vitro models. Despite this, little is known about the regulation and expression of cathelicidin during tuberculosis in vivo. We sought to determine whether the cathelicidin-related antimicrobial peptide (Cramp) gene, the murine functional homologue of the human cathelicidin gene (CAMP or LL-37), is required for regulating protective immunity during M...
January 18, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28097636/andrographolide-antibacterial-activity-against-common-bacteria-of-human-health-concern-and-possible-mechanism-of-action
#18
Malabika Banerjee, Debaprasad Parai, Subrata Chattopadhyay, Samir Kumar Mukherjee
Increasing bacterial resistance to common drugs is a major public health concern for the treatment of infectious diseases. Certain naturally occurring compounds of plant sources have long been reported to possess potential antimicrobial activity. This study was aimed to investigate the antibacterial activity and possible mechanism of action of andrographolide (Andro), a diterpenoid lactone from a traditional medicinal herb Andrographis paniculata. Extent of antibacterial action was assessed by minimal bactericidal concentration method...
January 17, 2017: Folia Microbiologica
https://www.readbyqxmd.com/read/28097041/effect-of-catechins-green-tea-extract-and-methylxanthines-in-combination-with-gentamicin-against-staphylococcus-aureus-and-pseudomonas-aeruginosa-combination-therapy-against-resistant-bacteria
#19
Bibi Sedigheh Fazly Bazzaz, Sahar Sarabandi, Bahman Khameneh, Hossein Hosseinzadeh
OBJECTIVES: Bacterial resistant infections have become a global health challenge and threaten the society's health. Thus, an urgent need exists to find ways to combat resistant pathogens. One promising approach to overcoming bacterial resistance is the use of herbal products. Green tea catechins, the major green tea polyphenols, show antimicrobial activity against resistant pathogens. The present study aimed to investigate the effect of catechins, green tea extract, and methylxanthines in combination with gentamicin against standard and clinical isolates of Staphylococcus aureus (S...
December 2016: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28097012/pharmacokinetics-and-pharmacodynamics-of-antibiotics-in-critically-ill-acute-kidney-injury-patients
#20
REVIEW
Welder Zamoner, Fernanda M de Freitas, Durval S S Garms, Mariele Gobo de Oliveira, André L Balbi, Daniela Ponce
Sepsis is the most common cause of death in critically ill patients and is associated with multiorgan failure, including acute kidney injury (AKI). This situation can require acute renal support and increase mortality. Therefore, it is essential to administer antimicrobials in doses that achieve adequate serum levels, avoiding both overdosing and drug toxicity as well as underdosing and the risk of antibiotic resistance and higher mortality. Currently, there are no validated guidelines on antibiotic dose adjustments in septic patients with AKI...
December 2016: Pharmacology Research & Perspectives
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