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https://www.readbyqxmd.com/read/28212308/antimicrobial-treatment-of-polymeric-medical-devices-by-silver-nanomaterials-and-related-technology
#1
REVIEW
Markéta Polívková, Tomáš Hubáček, Marek Staszek, Václav Švorčík, Jakub Siegel
Antimicrobial biocompatible polymers form a group of highly desirable materials in medicinal technology that exhibit interesting thermal and mechanical properties, and high chemical resistance. There are numerous types of polymers with antimicrobial activity or antimicrobial properties conferred through their proper modification. In this review, we focus on the second type of polymers, especially those whose antimicrobial activity is conferred by nanotechnology. Nanotechnology processing is a developing area that exploits the antibacterial effects of broad-scale compounds, both organic and inorganic, to form value-added medical devices...
February 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28210466/antimicrobial-effects-of-ferula-gummosa-boiss-gum-against-extended-spectrum-%C3%AE-lactamase-producing-acinetobacter-clinical-isolates
#2
Fatemeh Farid Afshar, Parvaneh Saffarian, Hamideh Mahmoodzadeh Hosseini, Fereshteh Sattarian, Mohsen Amin, Abbas Ali Imani Fooladi
BACKGROUND AND OBJECTIVES: Acinetobacter spp. are important causes of nosocomial infections. They possess various antibiotic resistance mechanisms including extended spectrum beta lactamases (ESBLs). The aim of this study was to determine antibiotic resistance profile of Acinetobacter clinical isolates especially among ESBL-producing strains and to investigate the antimicrobial effects of oleo-gum-resin extract and essential oil of Ferula gummosa Boiss. MATERIALS AND METHODS: 120 Acinetobacter strains were isolated from various clinical samples of hospitalized patients in Baqiyatallah hospital, Tehran during 2011-2012...
August 2016: Iranian Journal of Microbiology
https://www.readbyqxmd.com/read/28209374/design-synthesis-and-evaluation-of-novel-pyrazolo-pyrimido-4-5-d-pyrimidine-derivatives-as-potent-antibacterial-and-biofilm-inhibitors
#3
Lingala Suresh, P Sagar Vijay Kumar, Y Poornachandra, C Ganesh Kumar, G V P Chandramouli
An efficient four-component reaction of 6-amino-1,3-dimethyluracil, N,N-dimethylformamide dimethylacetal, 1-phenyl-3-(4-substituted-phenyl)-4-formyl-1H-pyrazoles and aromatic amines was conducted in the presence of [Bmim]FeCl4 ionic liquid as a promoting medium. This strategy provided a convenient route without any additional catalyst or metal salt under mild conditions. All the synthesized pyrazolo-pyrimido[4,5-d]pyrimidines derivatives were evaluated for their antibacterial, minimum bactericidal concentration (MBC), biofilm inhibition, intracellular ROS accumulation and protein leakage activities...
February 3, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28209130/determination-of-antibacterial-activity-and-minimum-inhibitory-concentration-of-larval-extract-of-fly-via-resazurin-based-turbidometric-assay
#4
Chien Huey Teh, Wasi Ahmad Nazni, Ab Hamid Nurulhusna, Ahmad Norazah, Han Lim Lee
BACKGROUND: Antimicrobial resistance is currently a major global issue. As the rate of emergence of antimicrobial resistance has superseded the rate of discovery and introduction of new effective drugs, the medical arsenal now is experiencing shortage of effective drugs to combat diseases, particularly against diseases caused by the dreadful multidrug-resistant strains, such as the methicillin-resistant Staphylococcus aureus (MRSA). The ability of fly larvae to thrive in septic habitats has prompted us to determine the antibacterial activity and minimum inhibitory concentrations (MICs) of larval extract of flies, namely Lucilia cuprina, Sarcophaga peregrina and Musca domestica against 4 pathogenic bacteria [Staphylococcus aureus, methicillin-resistant S...
February 16, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28208680/anti-bacterial-and-anti-fungal-activity-of-xanthones-obtained-via-semi-synthetic-modification-of-%C3%AE-mangostin-from-garcinia-mangostana
#5
Srinivasan Narasimhan, Shanmugam Maheshwaran, Imad A Abu-Yousef, Amin F Majdalawieh, Janarthanam Rethavathi, Prince Edwin Das, Palmiro Poltronieri
The microbial contamination in food packaging has been a major concern that has paved the way to search for novel, natural anti-microbial agents, such as modified α-mangostin. In the present study, twelve synthetic analogs were obtained through semi-synthetic modification of α-mangostin by Ritter reaction, reduction by palladium-carbon (Pd-C), alkylation, and acetylation. The evaluation of the anti-microbial potential of the synthetic analogs showed higher bactericidal activity than the parent molecule. The anti-microbial studies proved that I E showed high anti-bacterial activity whereas I I showed the highest anti-fungal activity...
February 12, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28205348/photochemical-eradication-of-methicillin-resistant-staphylococcus-aureus-by-blue-light-activation-of-riboflavin
#6
Karim Makdoumi, Ray Goodrich, Anders Bäckman
PURPOSE: To compare elimination of methicillin-resistant Staphylococcus aureus (MRSA) by exposure of blue light alone and with riboflavin. METHODS: A reference strain of MRSA was cultured and diluted in PBS with and without riboflavin (0.01%). Fifteen microlitre was added on a microscope slide, creating a fluid layer with a thickness of around 400 microns. Both of the bacterial suspensions were exposed to blue light, and the effect between exposure with and without riboflavin was compared...
February 15, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28204821/neutrophil-extracellular-traps-induce-il-1%C3%AE-production-by-macrophages-in-combination-with-lipopolysaccharide
#7
Zhongshuang Hu, Taisuke Murakami, Hiroshi Tamura, Johannes Reich, Kyoko Kuwahara-Arai, Toshiaki Iba, Yoko Tabe, Isao Nagaoka
Upon exposure to invading microorganisms, neutrophils undergo NETosis, a recently identified type of programmed cell death, and release neutrophil extracellular traps (NETs). NETs are described as an antimicrobial mechanism, based on the fact that NETs can trap microorganisms and exhibit bactericidal activity through the action of NET‑associated components. In contrast, the components of NETs have been recognized as damage‑associated molecular pattern molecules (DAMPs), which trigger inflammatory signals to induce cell death, inflammation and organ failure...
January 27, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28203238/differential-ability-of-bovine-antimicrobial-cathelicidins-to-mediate-nucleic-acid-sensing-by-epithelial-cells
#8
Arnaud Baumann, Mirjam Susanna Kiener, Brendan Haigh, Vincent Perreten, Artur Summerfield
Cathelicidins encompass a family of cationic peptides characterized by antimicrobial activity and other functions, such as the ability to enhance the sensing of nucleic acids by the innate immune system. The present study aimed to investigate the ability of the bovine cathelicidins indolicidin, bactenecin (Bac)1, Bac5, bovine myeloid antimicrobial peptide (BMAP)-27, BMAP-28, and BMAP-34 to inhibit the growth of bacteria and to enhance the sensing of nucleic acid by the host's immune system. BMAP-27 was the most effective at killing Staphylococcus aureus, Streptococcus uberis, and Escherichia coli, and this was dependent on its amphipathic structure and cationic charge...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28203232/cationic-net-charge-and-counter-ion-type-as-antimicrobial-activity-determinant-factors-of-short-lipopeptides
#9
Katarzyna E Greber, Malgorzata Dawgul, Wojciech Kamysz, Wieslaw Sawicki
To get a better insight into the antimicrobial potency of short cationic lipopeptides, 35 new entities were synthesized using solid phase peptide strategy. All newly obtained lipopeptides were designed to be positively charged from +1 to +4. This was achieved by introducing basic amino acid - lysine - into the lipopeptide structure and had a hydrophobic fatty acid chain attached. Lipopeptides were subjected to microbiological tests using reference strains of Gram-negative bacteria: Escherichia coli, Klebsiella pneumoniae, Proteus vulgaris, Pseudomonas aeruginosa, Gram-positive bacteria: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis, Enterococcus faecalis, and fungi: Candida albicans, Candida tropicalis, Aspergillus brasiliensis...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28198105/antibiotic-dependent-perturbations-of-extended-spectrum-beta-lactamase-producing-klebsiella-pneumoniae-proteome
#10
Moo-Jin Suh, Sarah L Keasey, Ernst E Brueggemann, Robert G Ulrich
Extended spectrum beta-lactamase producing Klebsiella pneumoniae (ESBL-KP) causes life-threatening infections in susceptible and immuno-compromised individuals. Because of the emergence of multidrug resistance and tolerance, it is crucial to better understand the mechanisms by which ESBL-KP can adapt to antibiotic stress. The aim of this study was to provide an overview of the global proteome changes occurring in ESBL-KP in response to sub-lethal concentrations of the antibiotics doxycycline (DC, bacteriostatic) and streptomycin (SM, bactericidal), which both impair ribosomal synthesis of bacterial proteins...
February 15, 2017: Proteomics
https://www.readbyqxmd.com/read/28197990/a-chlorhexidine-releasing-epoxy-based-coating-on-titanium-implants-prevents-staphylococcus-aureus-experimental-biomaterial-associated-infection
#11
M Riool, A J Dirks, V Jaspers, L de Boer, T J Loontjens, C M van der Loos, S Florquin, I Apachitei, L N Rijk, H A Keul, S A Zaat
Prevention of biomaterial-associated infections (BAI) remains a challenging problem, in particular due to the increased risk of resistance development with the current antibiotic-based strategies. Metallic orthopaedic devices, such as non-cemented implants, are often inserted under high mechanical stress. These non-cemented implants cannot be protected by e.g. antibioticreleasing bone cement or other antimicrobial approaches, such as the use of bioactive glass. Therefore, in order to avoid abrasion during implantation procedures, we developed an antimicrobial coating with great mechanical stability for orthopaedic implants, to prevent Staphylococcus aureus BAI...
February 14, 2017: European Cells & Materials
https://www.readbyqxmd.com/read/28196957/a-novel-small-molecule-inhibitor-of-the-mycobacterium-tuberculosis-demethylmenaquinone-methyltransferase-meng-is-bactericidal-to-both-growing-and-nutritionally-deprived-persister-cells
#12
Paridhi Sukheja, Pradeep Kumar, Nisha Mittal, Shao-Gang Li, Eric Singleton, Riccardo Russo, Alexander L Perryman, Riju Shrestha, Divya Awasthi, Seema Husain, Patricia Soteropoulos, Roman Brukh, Nancy Connell, Joel S Freundlich, David Alland
Active tuberculosis (TB) and latent Mycobacterium tuberculosis infection both require lengthy treatments to achieve durable cures. This problem has partly been attributable to the existence of nonreplicating M. tuberculosis "persisters" that are difficult to kill using conventional anti-TB treatments. Compounds that target the respiratory pathway have the potential to kill both replicating and persistent M. tuberculosis and shorten TB treatment, as this pathway is essential in both metabolic states. We developed a novel respiratory pathway-specific whole-cell screen to identify new respiration inhibitors...
February 14, 2017: MBio
https://www.readbyqxmd.com/read/28196734/bactericidal-activity-of-sera-from-adolescents-vaccinated-with-bivalent-rlp2086-against-meningococcal-serogroup-b-outbreak-strains-from-france
#13
Muhamed-Kheir Taha, Julio Cesar Hawkins, Paul Liberator, Ala-Eddine Deghmane, Lubomira Andrew, Li Hao, Thomas R Jones, Lisa K McNeil, Robert E O'Neill, John L Perez, Kathrin U Jansen, Annaliesa S Anderson
OBJECTIVES: Bivalent rLP2086 (Trumenba®; MenB-FHbp), composed of two factor H binding proteins (FHbps), is a vaccine approved in the United States for prevention of Neisseria meningitidis serogroup B (MnB) invasive meningococcal disease (IMD). Bactericidal activity of sera from subjects vaccinated with bivalent rLP2086 was assessed against MnB isolates from recent disease outbreaks in France. METHODS: MnB isolates from IMD cases were characterized by whole genome sequencing and FHbp expression was assessed using a flow cytometry-based assay...
February 10, 2017: Vaccine
https://www.readbyqxmd.com/read/28193909/rv2299c-a-novel-dendritic-cell-activating-antigen-of-mycobacterium-tuberculosis-fused-esat-6-subunit-vaccine-confers-improved-and-durable-protection-against-the-hypervirulent-strain-hn878-in-mice
#14
Han-Gyu Choi, Seunga Choi, Yong Woo Back, Seungwha Paik, Hye-Soo Park, Woo Sik Kim, Hongmin Kim, Seung Bin Cha, Chul Hee Choi, Sung Jae Shin, Hwa-Jung Kim
Understanding functional interactions between DCs and antigens is necessary for achieving an optimal and desired immune response during vaccine development. Here, we identified and characterized protein Rv2299c (heat-shock protein 90 family), which effectively induced DC maturation. The Rv2299c-maturated DCs showed increased expression of surface molecules and production of proinflammatory cytokines. Rv2299c induced these effects by binding to TLR4 and stimulating the downstream MyD88-, MAPK- and NF-κB-dependent signaling pathways...
February 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/28193668/towards-selective-mycobacterial-clpp1p2-inhibitors-with-reduced-activity-against-the-human-proteasome
#15
Wilfried Moreira, Sridhar Santhanakrishnan, Grace J Y Ngan, Choon Bing Low, Kanda Sangthongpitag, Anders Poulsen, Brian W Dymock, Thomas Dick
Mycobacterium tuberculosis (TB) is responsible for the greatest number of deaths worldwide due to a bacterial agent. We recently identified bortezomib (1) as a promising anti-TB compound. We showed that 1 inhibits the mycobacterial caseinolytic protease ClpP1P2 and exhibits bactericidal activity and established 1 and ClpP1P2 as an attractive lead/target couple. However, 1 is a human proteasome inhibitor currently approved for cancer therapy, and as such exhibits significant toxicity. Selective inhibition of the bacterial protease over the human proteasome is desirable in order to maintain antibacterial activity while reducing toxicity...
February 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28192483/development-of-a-high-throughput-method-to-evaluate-serum-bactericidal-activity-using-bacterial-atp-measurement-as-survival-readout
#16
Francesca Necchi, Allan Saul, Simona Rondini
Serum Bactericidal Activity (SBA) assay is the method of choice to evaluate the complement-mediated functional activity of both infection- and vaccine-induced antibodies. To perform a typical SBA assay, serial dilutions of sera are incubated with target bacterial strains and complement. The conventional SBA assay is based on plating on agar the SBA reaction mix and counting the surviving bacterial colony forming units (CFU) at each serum dilution. Even with automated colony counting, it is labor-intensive, time-consuming and not amenable for large-scale studies...
2017: PloS One
https://www.readbyqxmd.com/read/28192437/species-dependent-impact-of-helminth-derived-antigens-on-human-macrophages-infected-with-mycobacterium-tuberculosis-direct-effect-on-the-innate-anti-mycobacterial-response
#17
Naomi Aira, Anna-Maria Andersson, Susmita K Singh, Derek M McKay, Robert Blomgran
BACKGROUND: In countries with a high prevalence of tuberculosis there is high coincident of helminth infections that might worsen disease outcome. While Mycobacterium tuberculosis (Mtb) gives rise to a pro-inflammatory Th1 response, a Th2 response is typical of helminth infections. A strong Th2 response has been associated with decreased protection against tuberculosis. PRINCIPAL FINDINGS: We investigated the direct effect of helminth-derived antigens on human macrophages, hypothesizing that helminths would render macrophages less capable of controlling Mtb...
February 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28188204/siderophore-product-ornibactin-is-required-for-the-bactericidal-activity-of-burkholderia-contaminans-ms14
#18
Peng Deng, Adam Foxfire, Jianhong Xu, Sonya M Baird, Jiayuan Jia, Keren H Delgado, Ronald Shin, Leif Smith, Shi-En Lu
Burkholderia contaminans MS14 was isolated from soil in Mississippi. When cultivated on nutrient broth-yeast extract (NBY) agar medium, the colonies exhibit bactericidal activity against a wide range of plant pathogenic bacteria. Only a bacteriostatic compound with siderophore activity was successfully purified, which was determined by nuclear magnetic resonance (NMR) to be ornibactin. The isolation of the bactericidal compound has not yet been achieved, thus, the exact nature of the bactericidal compound is still unknown...
February 10, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28186464/evaluation-of-antimicrobial-photodynamic-therapy-using-indocyanine-green-and-near-infrared-diode-laser-against-enterococcus-faecalis-in-infected-human-root-canals
#19
Charis Beltes, Nikolaos Economides, Hercules Sakkas, Chrissanthy Papadopoulou, Theodoros Lambrianidis
OBJECTIVE: Photodynamic therapy (PDT) is considered a promising adjunct to the currently available endodontic disinfection techniques leading to more effective reduction of intracanal bacteria. The present ex vivo study aimed to assess the antimicrobial effect of PDT using indocyanine green (ICG) as photosensitizer and a near-infrared (NIR) diode laser in root canals of human teeth infected with Enterococcus faecalis. MATERIALS AND METHODS: Ninety single-rooted teeth after chemomechanical preparation and sterilization were contaminated with an E...
February 9, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28185274/clarithromycin-trimethoprim-and-penicillin-and-oxidative-nucleic-acid-modifications-in-humans-randomised-controlled-trials
#20
Emil List Larsen, Vanja Cejvanovic, Laura Kofoed Kjaer, Morten Thorup Pedersen, Sara Daugaard Popik, Lina Kallehave Hansen, Jon Traerup Andersen, Espen Jimenez-Solem, Kasper Broedbaek, Morten Petersen, Allan Weimann, Trine Henriksen, Jens Lykkesfeldt, Christian Torp-Pedersen, Henrik Enghusen Poulsen
AIMS: In vitro studies have demonstrated that formation of reactive oxygen species (ROS) contributes to the effect of bactericidal antibiotics. The formation of ROS is not restricted to bacteria, but also occurs in mammalian cells. Oxidative stress is linked to several diseases. This study investigates whether antibiotic drugs induce oxidative stress in healthy humans as a possible mechanism for adverse reactions to the antibiotic drugs. METHODS: This study contains information from two randomised, controlled trials...
February 10, 2017: British Journal of Clinical Pharmacology
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