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https://www.readbyqxmd.com/read/28538243/bk-virus-as-a-mediator-of-graft-dysfunction-following-kidney-transplantation
#1
Stephanie G Yi, Richard J Knight, Keri E Lunsford
PURPOSE OF REVIEW: BK virus is a significant risk factor for kidney allograft dysfunction and loss among renal transplant recipients. Currently, there is no proven effective treatment except for the reduction of immunosuppression. In this review, we discuss diagnostic challenges and current treatment options for BK in kidney transplant recipients. RECENT FINDINGS: Antiviral and antibiotic therapies have been employed for BK viraemia with variable efficacy. In addition, novel therapeutic regimens such as adoptive transfer of targeted T cells have been described as possible treatment options for recipients with BK nephropathy...
May 22, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28535607/generation-of-the-new-discovered-resistant-gene-mcr-1-knockout-in-escherichia-coli-using-crispr-cas9-system
#2
Lichang Sun, Tao He, Lili Zhang, Maoda Pang, Qiaoyan Zhang, Yan Zhou, Hongduo Bao, Ran Wang
The mcr-1 gene was the new discovered "superbug" gene which makes the bacteria highly resistant to the last-resort class of antibiotics in China in 2016. The mcr-1 gene raised serious concern about its possible global dissemination and spread. Here, we report a potential anti-resistant strategy that CRISPR/Cas9 mediated approach can efficiently induce mcr-1 gene knockout in Escherichia coli. Our findings suggested that using CRISPPR/Cas9 system to knockout the resistant gene mcr-1 might be a potential anti-resistant strategy...
May 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28535440/management-of-ventilator-associated-pneumonia-with-a-new-antibiotic-adjuvant-entity-ceftriaxone-sulbactam-disodium-edetate-a-novel-approach-to-spare-carbapenems
#3
Prachee Sathe, Sagar Maddani, Shilpa Kulkarni, Nita Munshi
BACKGROUND: Ventilator associated pneumonia (VAP) is one of the most serious nosocomial infections in Intensive Care Unit (ICU). The aim of this study was to evaluate a new approach to spare the carbapenems for the management of patients diagnosed with VAP due to Acinetobacter baumannii (A. baumannii). METHOD: This retrospective study was conducted on VAP patients presenting for treatment at tertiary care centre between May 2014 and March 2016. The case sheets of patients who have been treated for VAP with meropenem, antibiotic adjuvant entity (AAE) and colistin were analysed...
May 15, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28534807/lobophorin-k-a-new-natural-product-with-cytotoxic-activity-produced-by-streptomyces-sp-m-207-associated-with-the-deep-sea-coral-lophelia-pertusa
#4
Alfredo F Braña, Aida Sarmiento-Vizcaíno, Miguel Osset, Ignacio Pérez-Victoria, Jesús Martín, Nuria de Pedro, Mercedes de la Cruz, Caridad Díaz, Francisca Vicente, Fernando Reyes, Luis A García, Gloria Blanco
The present article describes the isolation of a new natural product of the lobophorin family, designated as lobophorin K (1), from cultures of the marine actinobacteria Streptomyces sp. M-207, previously isolated from the cold-water coral Lophelia pertusa collected at 1800 m depth during an expedition to the submarine Avilés Canyon. Its structure was determined using a combination of spectroscopic techniques, mainly ESI-TOF MS and 1D and 2D NMR. This new natural product displayed cytotoxic activity against two human tumor cell lines, such as pancreatic carcinoma (MiaPaca-2) and breast adenocarcinoma (MCF-7)...
May 19, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28534207/construction-of-polyarylenes-with-various-structural-features-via-bergman-cyclization-polymerization
#5
REVIEW
Youfu Wang, Shudan Chen, Aiguo Hu
Synthetic polymer chemistry is a fundamental part of polymer science, and highly efficient polymerization reactions are essential for the synthesis of high-performance polymers. Development of new synthetic methods for emerging polymer science is of great importance in this regard. Bergman cyclization is a chemical process in which highly reactive aryl diradicals form from enediyne precursors, having a strong impact in a number of fields including pharmaceutics, synthetic chemistry, and materials science. Diradical intermediates stemming from enediynes can cause DNA cleavage under physiological conditions, leading to the strong cytotoxicity of many naturally occurring enediyne antibiotics...
June 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28534009/genomic-insight-into-mechanisms-of-reversion-of-antibiotic-resistance-in-multidrug-resistant-mycobacterium-tuberculosis-induced-by-a-nanomolecular-iodine-containing-complex-fs-1
#6
Aleksandr I Ilin, Murat E Kulmanov, Ilya S Korotetskiy, Rinat A Islamov, Gulshara K Akhmetova, Marina V Lankina, Oleg N Reva
Drug induced reversion of antibiotic resistance is a promising way to combat multidrug resistant infections. However, lacking knowledge of mechanisms of drug resistance reversion impedes employing this approach in medicinal therapies. Induction of antibiotic resistance reversion by a new anti-tuberculosis drug FS-1 has been reported. FS-1 was used in this work in combination with standard anti-tuberculosis antibiotics in an experiment on laboratory guinea pigs infected with an extensively drug resistant (XDR) strain Mycobacterium tuberculosis SCAID 187...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28533265/antibiotic-prescription-strategies-and-adverse-outcome-for-uncomplicated-lower-respiratory-tract-infections-prospective-cough-complication-cohort-3c-study
#7
Paul Little, Beth Stuart, Sue Smith, Matthew J Thompson, Kyle Knox, Ann van den Bruel, Mark Lown, Michael Moore, David Mant
Objective To assess the impact on adverse outcomes of different antibiotic prescribing strategies for lower respiratory tract infections in people aged 16 years or more.Design Prospective cohort study.Setting UK general practice.Participants 28 883 patients with lower respiratory tract infection; symptoms, signs, and antibiotic prescribing strategies were recorded at the index consultation.Main outcome measures The main outcomes were reconsultation with symptoms of lower respiratory tract infection in the 30 days after the index consultation, hospital admission, or death...
May 22, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28533247/first-detection-of-a-fosfomycin-resistance-gene-fosa7-in-salmonella-enterica-serovar-heidelberg-isolated-from-broiler-chickens
#8
Muhammad A Rehman, Xianhua Yin, Marissa G Persaud-Lachhman, Moussa S Diarra
We previously described Salmonella Heidelberg harbouring a chromosomal gene cluster similar to the glutathione S-transferase gene, a putative fosA conferring resistance to fosfomycin. Here we show that this new gene named fosA7 confers resistance to fosfomycin. Introduction of fosA7 into fosfomycin susceptible Salmonella Enteritidis, resulted in a substantial increase in the fosfomycin MIC. This finding increases awareness of antibiotic resistance in Salmonella Heidelberg from broiler related to the food safety and public health...
May 22, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28532080/antibiotic-loaded-microspheres-as-antimicrobial-delivery-systems-for-medical-applications
#9
J Szczeblinska, K Fijalkowski, J Kohn, M El Fray
In this paper, we present the preparation and antibiotic loading of polymeric microspheres, composed of copolymers derived from fatty acid/amino acid components, as new polymeric platforms for antibiotic delivery systems. New polymeric materials were used to prepare microspheres with and without immobilized model antibiotics (streptomycin, chloramphenicol and amphotericin B) by a W/O/W double-emulsion/solvent evaporation method, in which chloroform and poly(vinyl alcohol) are used as the solvent and emulsifier, respectively...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28531095/synthesis-of-1-2-3-triazolo-4-5-h-quinolone-derivatives-with-novel-anti-microbial-properties-against-metronidazole-resistant-helicobacter-pylori
#10
Mohammad Abu-Sini, Amal Mayyas, Nehaya Al-Karablieh, Rula Darwish, Yusuf Al-Hiari, Talal Aburjai, Shereen Arabiyat, Luay Abu-Qatouseh
Helicobacter pylori infection can lead to gastritis, peptic ulcer, and the development of mucosa associated lymphoid tissue (MALT) lymphoma. Treatment and eradication of H. pylori infection can prevent relapse and accelerate the healing of gastric and duodenal ulcers as well as regression of malignancy. Due to the increasing emergence of antibiotic resistance among clinical isolates of H. pylori, alternative approaches using newly discovered antimicrobial agents in combination with the standard antibiotic regimens for the treatment of H...
May 20, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28530797/unexpected-biotransformation-of-the-hdac-inhibitor-vorinostat-yields-aniline-containing-fungal-metabolites
#11
Donovon A Adpressa, Kayla J Stalheim, Philip Jerome Proteau, Sandra Loesgen
The diversity of genetically encoded small molecules produced by filamentous fungi remains largely unexplored, which makes these fungi an attractive source for the discovery of new compounds. However, accessing their full chemical repertoire under common laboratory culture conditions is a challenge. Epigenetic manipulation of gene expression has become a well-established tool for overcoming this obstacle. Here we report that perturbation of the endophytic ascomycete Chalara sp. 6661, producer of the isofusidienol class of antibiotics, with the HDAC inhibitor vorinostat resulted in the production of four new modified xanthones...
May 22, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28530279/bifunctional-antimicrobial-conjugates-and-hybrid-antimicrobials
#12
REVIEW
P Klahn, M Brönstrup
Covering: up to the end of 2016Novel antimicrobial drugs are continuously needed to counteract bacterial resistance development. An innovative molecular design strategy for novel antibiotic drugs is based on the hybridization of an antibiotic with a second functional entity. Such conjugates can be grouped into two major categories. In the first category (antimicrobial hybrids), both functional elements of the hybrid exert antimicrobial activity. Due to the dual targeting, resistance development can be significantly impaired, the pharmacokinetic properties can be superior compared to combination therapies with the single antibiotics, and the antibacterial potency is often enhanced in a synergistic manner...
May 22, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28530195/facile-synthesis-of-silver-nanoparticles-mediated-by-polyacrylamide-reduction-approach-to-antibacterial-application
#13
Hosam I Salaheldin, Meshal H K Almalki, Abd Elhameed M Hezma, Gamal E H Osman
The current time increase in the prevalence of antibiotic resistant 'super-bugs' and the risks associated with food safety have become global issues. Therefore, further research is warranted to identify new and effective antimicrobial substances. Silver nanoparticles (Ag-NPs) were synthesized by autoclaving technique using, different concentrations of Ag salt (AgNO3) solution (1, 5, 10, and 25 mM). Their presence was confirmed by a surface plasmon resonance band at ∼435 nm using UV-Vis absorption spectra...
June 2017: IET Nanobiotechnology
https://www.readbyqxmd.com/read/28529865/hyaluronic-acid-and-its-composites-as-a-local-antimicrobial-antiadhesive-barrier
#14
REVIEW
C L Romanò, E De Vecchi, M Bortolin, I Morelli, L Drago
Living in biofilms is probably the most common condition for bacteria and fungi and biofilm-related infections account for the majority of bacterial infectious diseases worldwide. Among others biofilm-related infections, those associated with implanted biomaterials have an enormous and still largely underestimated impact in orthopaedics and trauma, cardio-surgery and several other surgical disciplines. Given the limited efficacy of existing antibiotics in the prevention and treatment of bacterial biofilms, new strategies are needed to protect implants and host tissues, overcoming the striking ability of the microorganisms to adhere on different surfaces and to immediately protect themselves by forming the biofilm matrix...
2017: J Bone Jt Infect
https://www.readbyqxmd.com/read/28529326/persistent-bacterial-infections-and-persister-cells
#15
REVIEW
Robert A Fisher, Bridget Gollan, Sophie Helaine
Many bacteria can infect and persist inside their hosts for long periods of time. This can be due to immunosuppression of the host, immune evasion by the pathogen and/or ineffective killing by antibiotics. Bacteria can survive antibiotic treatment if they are resistant or tolerant to a drug. Persisters are a subpopulation of transiently antibiotic-tolerant bacterial cells that are often slow-growing or growth-arrested, and are able to resume growth after a lethal stress. The formation of persister cells establishes phenotypic heterogeneity within a bacterial population and has been hypothesized to be important for increasing the chances of successfully adapting to environmental change...
May 22, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28528940/macromolecular-agents-with-antimicrobial-potentialities-a-drive-to-combat-antimicrobial-resistance
#16
REVIEW
Muhammad Bilal, Tahir Rasheed, Hafiz M N Iqbal, Hongbo Hu, Wei Wang, Xuehong Zhang
In recent years, the antimicrobial resistance (AMR) or multidrug resistance (MDR) has become a serious health concern and major challenging issue, worldwide. After decades of negligence, the AMR has now captured global attention. The increasing number of antibiotic-resistant strains has threatened the achievements of science and medicine since it inactivates conventional antimicrobial therapeutics. Scientists are trying to respond to AMR/MDR threat by exploring innovative platforms and new therapeutic strategies to tackle infections from these resistant strains and bypass treatment limitations related to these pathologies...
May 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28528648/copper-and-antibiotics-discovery-modes-of-action-and-opportunities-for-medicinal-applications
#17
Alex G Dalecki, Cameron L Crawford, Frank Wolschendorf
Copper is a ubiquitous element in the environment as well as living organisms, with its redox capabilities and complexation potential making it indispensable for many cellular functions. However, these same properties can be highly detrimental to prokaryotes and eukaryotes when not properly controlled, damaging many biomolecules including DNA, lipids, and proteins. To restrict free copper concentrations, all bacteria have developed mechanisms of resistance, sequestering and effluxing labile copper to minimize its deleterious effects...
2017: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/28528646/metal-based-combinations-that-target-protein-synthesis-by-fungi
#18
Cindy Vallières, Simon V Avery
A wide range of fungicides (or antifungals) are used in agriculture and medicine, with activities against a spectrum of fungal pathogens. Unfortunately, the evolution of fungicide resistance has become a major issue. Therefore, there is an urgent need for new antifungal treatments. Certain metals have been used for decades as efficient fungicides in agriculture. However, concerns over metal toxicity have escalated over this time. Recent studies have revealed that metals like copper and chromate can impair functions required for the fidelity of protein synthesis in fungi...
2017: Advances in Microbial Physiology
https://www.readbyqxmd.com/read/28528569/time-to-treatment-and-mortality-during-mandated-emergency-care-for-sepsis
#19
Christopher W Seymour, Foster Gesten, Hallie C Prescott, Marcus E Friedrich, Theodore J Iwashyna, Gary S Phillips, Stanley Lemeshow, Tiffany Osborn, Kathleen M Terry, Mitchell M Levy
Background In 2013, New York began requiring hospitals to follow protocols for the early identification and treatment of sepsis. However, there is controversy about whether more rapid treatment of sepsis improves outcomes in patients. Methods We studied data from patients with sepsis and septic shock that were reported to the New York State Department of Health from April 1, 2014, to June 30, 2016. Patients had a sepsis protocol initiated within 6 hours after arrival in the emergency department and had all items in a 3-hour bundle of care for patients with sepsis (i...
May 21, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28528473/properties-of-streptomyces-albus-j1074-mutant-deficient-in-trna-leu-uaa-gene-blda
#20
Oksana Koshla, Maria Lopatniuk, Ihor Rokytskyy, Oleksandr Yushchuk, Yuriy Dacyuk, Victor Fedorenko, Andriy Luzhetskyy, Bohdan Ostash
Streptomyces albus J1074 is one of the most popular and convenient hosts for heterologous expression of gene clusters directing the biosynthesis of various natural metabolic products, such as antibiotics. This fuels interest in elucidation of genetic mechanisms that may limit secondary metabolism in J1074. Here, we report the generation and initial study of J1074 mutant, deficient in gene bldA for tRNA(Leu)UAA, the only tRNA capable of decoding rare leucyl TTA codon in Streptomyces. The bldA deletion in J1074 resulted in a highly conditional Bld phenotype, with depleted formation of aerial hyphae on certain solid media...
May 20, 2017: Archives of Microbiology
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