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Multidrug resistant gram negative bacteria

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https://www.readbyqxmd.com/read/29767453/optimizing-antimicrobial-peptide-dendrimers-in-chemical-space
#1
Thissa Siriwardena, Alice Capecchi, Bee-Ha Gan, Xian Jin, Runze He, Dengwen Wei, Lan Ma, Thilo Köhler, Christian van Delden, Sacha Javor, Jean-Louis Reymond
Here we used nearest neighbor searches in chemical space to improve the activity of antimicrobial peptide dendrimer (AMPD) G3KL and identified dendrimer T7 with an expanded activity range against Gram-negative pathogenic bacteria including Klebsiellae pneumoniae, increased serum stability and promising activity in an in vivo infection model against a multidrug resistant strain of Acinetobacter baumannii. Imaging, spectroscopic studies and a structural model from molecular dynamics simulations suggest that T7 acts by membrane disruption...
May 16, 2018: Angewandte Chemie
https://www.readbyqxmd.com/read/29765362/tachyplesin-causes-membrane-instability-that-kills-multidrug-resistant-bacteria-by-inhibiting-the-3-ketoacyl-carrier-protein-reductase-fabg
#2
Cunbao Liu, Jialong Qi, Bin Shan, Yanbing Ma
Tachyplesin is a type of cationic β-hairpin antimicrobial peptide discovered in horseshoe crab approximately 30 years ago that is well known for both its potential antimicrobial activities against multidrug-resistant bacteria and its cytotoxicity to mammalian cells. Though its physical interactions with artificial membranes have been well studied, details of its physiological mechanism of action the physiological consequences of its action remain limited. By using the DNA-binding fluorescent dye propidium iodide to monitor membrane integrity, confocal microscopy to assess the intracellular location of FITC-tagged tachyplesin, and RNA sequencing of the differentially expressed genes in four Gram-negative bacteria ( Escherichia coli, Acinetobacter baumannii, Klebsiella pneumoniae , and Pseudomonas aeruginosa ) treated with lethal or sublethal concentrations of tachyplesin, we found that compared with levofloxacin-treated bacteria, tachyplesin-treated bacteria showed significant effects on the pathways underlying unsaturated fatty acid biosynthesis...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29765275/-tristemma-hirtum-and-five-other-cameroonian-edible-plants-with-weak-or-no-antibacterial-effects-modulate-the-activities-of-antibiotics-against-gram-negative-multidrug-resistant-phenotypes
#3
Gaëlle S Nguenang, Armelle T Mbaveng, Aimé G Fankam, Hermione T Manekeng, Paul Nayim, Brice E N Wamba, Victor Kuete
In order to contribute to the fight against infectious diseases, the in vitro antibacterial activity and the antibiotic-potentiating effects of Tristemma hirtum and five other Cameroonian edible plants have been evaluated against Gram-negative multidrug-resistant (MDR) phenotypes. The microdilution method was used to evaluate the bacterial susceptibility of the extracts and their combination to common antibiotics. The phytochemical screening of the extracts was carried out according to standard methods. Phytochemical analysis of the extracts revealed the presence of alkaloids, triterpenes, steroids, and polyphenols, including flavonoids in most of the tested extracts...
2018: TheScientificWorldJournal
https://www.readbyqxmd.com/read/29760961/ctx-m-15-is-established-in-most-multidrug-resistant-uropathogenic-enterobacteriaceae-and-pseudomonaceae-from-hospitals-in-nigeria
#4
David Olusoga Ogbolu, O A Terry Alli, Mark Alexander Webber, Adeolu Sunday Oluremi, Omoboriowo Moses Oloyede
β-Lactam antibiotics are widely used to treat urinary tract infections in Nigeria. This study aimed to determine the presence and characteristics of extended spectrum β-lactamases in commonly isolated uropathogenic Gram-negative bacteria (GNB) in Nigeria. Fifty non-duplicate GNB isolates consisting of Escherichia coli , 19; Klebsiella pneumoniae , 21; and Pseudomonas aeruginosa , 10 were obtained from three tertiary hospitals in Nigeria. The antibiotic susceptibility testing of all isolates to a panel of antibiotics including minimum inhibitory concentrations (MICs) and extended spectrum β-lactamases was determined...
April 2018: European Journal of Microbiology & Immunology
https://www.readbyqxmd.com/read/29760959/molecular-epidemiology-of-multidrug-resistant-bacteria-isolated-from-libyan-and-syrian-patients-with-war-injuries-in-two-bundeswehr-hospitals-in-germany
#5
Hagen Frickmann, Thomas Köller, Ralf Matthias Hagen, Klaus-Peter Ebert, Martin Müller, Werner Wenzel, Renate Gatzer, Ulrich Schotte, Alfred Binder, Romy Skusa, Philipp Warnke, Andreas Podbielski, Christian Rückert, Bernd Kreikemeyer
Introduction: We assessed the molecular epidemiology of multidrug-resistant bacteria colonizing or infecting war-injured patients from Libya and Syria who were treated at the Bundeswehr hospitals Hamburg and Westerstede, Germany. Methods: Enterobacteriaceae and Gram-negative rod-shaped nonfermentative bacteria with resistance against third-generation methoxyimino cephalosporins or carbapenems as well as methicillin-resistant Staphylococcus aureus (MRSA) from war-injured patients from Libya and Syria were assessed by molecular typing, i...
April 2018: European Journal of Microbiology & Immunology
https://www.readbyqxmd.com/read/29751127/temporal-trends-and-patterns-in-antimicrobial-resistant-gram-negative-bacteria-implicated-in-intensive-care-unit-acquired-infections-a-cohort-based-surveillance-study-in-istanbul-turkey
#6
Bulent Durdu, Evangelos I Kritsotakis, Andrew C K Lee, Perihan Torun, Ismail N Hakyemez, Bilge Gultepe, Turan Aslan
OBJECTIVES: This study assessed trends and patterns in antimicrobial resistant intensive care unit (ICU)-acquired infections caused by Gram-negative bacteria (GNB) in Istanbul, Turkey. METHODS: Bacterial culture and antibiotic susceptibility data were collected for all GNB causing nosocomial infections in five adult ICUs of a large university hospital during 2012-2015. Multi-resistance patterns were categorised as multidrug (MDR), extensively-drug (XDR) and pandrug (PDR)-resistance...
May 8, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29744456/facially-amphiphilic-polyionene-biocidal-polymers-derived-from-lithocholic-acid
#7
Mitra S Ganewatta, Md Anisur Rahman, Louis Mercado, Tinom Shokfai, Alan W Decho, Theresa M Reineke, Chuanbing Tang
Bacterial infections have become a global issue that requires urgent attention, particularly regarding to emergence of multidrug resistant bacteria. We developed quaternary amine-containing antimicrobial poly(bile acid)s that contain a hydrophobic core of lithocholic acid in the main-chain. Interestingly, by choosing appropriate monomers, these cationic polymers can form core-shell micelles. These polymers exhibited biocidal activity against both Gram-positive and Gram-negative bacterial species. It is demonstrated that the micelles can deliver hydrophobic antibiotics that functionally have dual antimicrobial activities...
June 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29741597/acinetobacter-pneumonia-improving-outcomes-with-early-identification-and-appropriate-therapy
#8
Cristina Vazquez Guillamet, Marin H Kollef
In an era of increasing antimicrobial resistance, Acinetobacter distinguishes itself as one of the most resistant Gram-negative bacteria responsible for significant morbidity and mortality. New solutions are needed to combat the detrimental effects of increasing rates of antimicrobial resistance. Using empiric broad-spectrum antibiotics in patients deemed at risk for infections caused by multidrug-resistant pathogens may protect against attributable mortality but this temporary solution furthers the risk of antimicrobial resistance...
May 5, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29740543/quorum-sensing-signaling-and-quenching-in-the-multidrug-resistant-pathogen-stenotrophomonas-maltophilia
#9
REVIEW
Pol Huedo, Xavier Coves, Xavier Daura, Isidre Gibert, Daniel Yero
Stenotrophomonas maltophilia is an opportunistic Gram-negative pathogen with increasing incidence in clinical settings. The most critical aspect of S. maltophilia is its frequent resistance to a majority of the antibiotics of clinical use. Quorum Sensing (QS) systems coordinate bacterial populations and act as major regulatory mechanisms of pathogenesis in both pure cultures and poly-microbial communities. Disruption of QS systems, a phenomenon known as Quorum Quenching (QQ), represents a new promising paradigm for the design of novel antimicrobial strategies...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29738784/m-grabowski-et-al-characterizations-of-handwashing-sink-activities-in-a-single-hospital-medical-intensive-care-unit
#10
M Grabowski, J M Lobo, B Gunnell, K Enfield, R Carpenter, L Barnes, A Mathers
BACKGROUND: Handwashing sink drains are increasingly implicated as a potential reservoir of antibiotic-resistant bacteria in hospital outbreaks; however, usage patterns that may promote this source remain unknown. AIM: To understand behaviours in the intensive care unit (ICU) that may facilitate establishment and nosocomial transmission of multidrug-resistant Gram negatives from a sink-trap reservoir to a patient. METHODS: Motion-sensitive cameras captured anonymized activity paired with periodic in-person observations during a quality investigation from four ICU sinks (two patient rooms and two patient bathrooms) in a university hospital...
May 5, 2018: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29731647/ambulance-vehicles-as-a-source-of-multidrug-resistant-infections-a-multicenter-study-in-assiut-city-egypt
#11
Mohamed A El-Mokhtar, Helal F Hetta
Background: Ambulances may represent a potential source of infection to patients, patients' relatives, and paramedical staffs. In this study, we analyzed the extent of bacterial contamination in ambulance vehicles and measured the degree of antimicrobial resistance among isolated pathogens. Materials and methods: Twenty-five vehicles were included and 16 sampling points were swabbed in each vehicle. Then the swabs were immediately transferred to the laboratory to identify bacterial contaminants utilizing standard microbiological procedures and API® systems...
2018: Infection and Drug Resistance
https://www.readbyqxmd.com/read/29717727/an-antimicrobial-bicyclic-peptide-from-chemical-space-against-multidrug-resistant-gram-negative-bacteria
#12
Ivan Di Bonaventura, Stéphane Baeriswyl, Alice Capecchi, Bee-Ha Gan, Xian Jin, Thissa N Siriwardena, Runze He, Thilo Köhler, Arianna Pompilio, Giovanni Di Bonaventura, Christian van Delden, Sacha Javor, Jean-Louis Reymond
We used the concept of chemical space to explore a virtual library of bicyclic peptides formed by double thioether cyclization of a precursor linear peptide, and identified an antimicrobial bicyclic peptide (AMBP) with remarkable activity against several MDR strains of Acinetobacter baumannii and Pseudomonas aeruginosa.
May 2, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29713166/in-vivo-antimicrobial-activity-of-silver-nanoparticles-produced-via-a-green-chemistry-synthesis-using-acacia-rigidula-as-a-reducing-and-capping-agent
#13
Carlos Enrique Escárcega-González, J A Garza-Cervantes, A Vázquez-Rodríguez, Liliana Zulem Montelongo-Peralta, M T Treviño-González, E Díaz Barriga Castro, E M Saucedo-Salazar, R M Chávez Morales, D I Regalado Soto, F M Treviño González, J L Carrazco Rosales, Rocío Villalobos Cruz, José Rubén Morones-Ramírez
Introduction: One of the main issues in the medical field and clinical practice is the development of novel and effective treatments against infections caused by antibiotic-resistant bacteria. One avenue that has been approached to develop effective antimicrobials is the use of silver nanoparticles (Ag-NPs), since they have been found to exhibit an efficient and wide spectrum of antimicrobial properties. Among the main drawbacks of using Ag-NPs are their potential cytotoxicity against eukaryotic cells and the latent environmental toxicity of their synthesis methods...
2018: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29707286/-in-vitro-assessment-of-cefoperazone-sulbactam-based-combination-therapy-for-multidrug-resistant-acinetobacter-baumannii-isolates-in-china
#14
Tao Li, Meiyan Sheng, Tengzhen Gu, Yan Zhang, Ailiyaer Yirepanjiang, Yu Li
Background: Multidrug-resistant Acinetobacter baumannii (MDRAB) has emerged as an important pathogen of nosocomial infections. Even though cefoperazone-sulbactam is frequently used to treat MDRAB infections, this single-drug therapeutic approach often results in antibiotic resistance. Thus, combination therapy is preferred over single-drug therapy, particularly in the case of carbapenemase-producing gram negative bacteria. The aim of this study was to investigate the efficacy of cefoperazone-sulbactam combined with either tigecycline or rifampicin against clinical isolates of MDRAB...
March 2018: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/29706953/conserved-bacterial-binding-peptides-of-the-scavenger-like-human-lymphocyte-receptor-cd6-protect-from-mouse-experimental-sepsis
#15
Mario Martínez-Florensa, Cristina Català, María Velasco-de Andrés, Olga Cañadas, Víctor Fraile-Ágreda, Sergi Casadó-Llombart, Noelia Armiger-Borràs, Marta Consuegra-Fernández, Cristina Casals, Francisco Lozano
Sepsis is an unmet clinical need constituting one of the most important causes of death worldwide, a fact aggravated by the appearance of multidrug resistant strains due to indiscriminate use of antibiotics. Host innate immune receptors involved in pathogen-associated molecular patterns (PAMPs) recognition represent a source of broad-spectrum therapies alternative or adjunctive to antibiotics. Among the few members of the ancient and highly conserved scavenger receptor cysteine-rich superfamily (SRCR-SF) sharing bacterial-binding properties there is CD6, a lymphocyte-specific surface receptor...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29706941/novel-polymyxin-combination-with-antineoplastic-mitotane-improved-the-bacterial-killing-against-polymyxin-resistant-multidrug-resistant-gram-negative-pathogens
#16
Thien B Tran, Jiping Wang, Yohei Doi, Tony Velkov, Phillip J Bergen, Jian Li
Due to limited new antibiotics, polymyxins are increasingly used to treat multidrug-resistant (MDR) Gram-negative bacteria, in particular carbapenem-resistant Acinetobacter baumannii , Pseudomonas aeruginosa , and Klebsiella pneumoniae . Unfortunately, polymyxin monotherapy has led to the emergence of resistance. Polymyxin combination therapy has been demonstrated to improve bacterial killing and prevent the emergence of resistance. From a preliminary screening of an FDA drug library, we identified antineoplastic mitotane as a potential candidate for combination therapy with polymyxin B against polymyxin-resistant Gram-negative bacteria...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29705860/bloodstream-infections-in-haematological-cancer-patients-colonized-by-multidrug-resistant-bacteria
#17
C Cattaneo, R Di Blasi, C Skert, A Candoni, B Martino, N Di Renzo, M Delia, S Ballanti, F Marchesi, V Mancini, E Orciuolo, S Cesaro, L Prezioso, R Fanci, G Nadali, A Chierichini, L Facchini, M Picardi, M Malagola, V Orlando, E M Trecarichi, M Tumbarello, F Aversa, G Rossi, L Pagano
Infections by multidrug-resistant (MDR) bacteria are a worrisome phenomenon in hematological patients. Data on the incidence of MDR colonization and related bloodstream infections (BSIs) in haematological patients are scarce. A multicentric prospective observational study was planned in 18 haematological institutions during a 6-month period. All patients showing MDR rectal colonization as well as occurrence of BSI at admission were recorded. One-hundred forty-four patients with MDR colonization were observed (6...
April 28, 2018: Annals of Hematology
https://www.readbyqxmd.com/read/29704005/multidrug-resistant-pseudomonas-aeruginosa-aggravates-inflammatory-responses-in-murine-chronic-colitis
#18
Eliane von Klitzing, Ira Ekmekciu, Anja A Kühl, Stefan Bereswill, Markus M Heimesaat
The World Health Organization has rated multidrug-resistant (MDR) Gram-negative bacteria including Pseudomonas aeruginosa (Psae) as serious threat to human health. We here addressed whether chronic murine gut inflammation facilitates intestinal MDR Psae colonization and whether bacterial infection subsequently worsens colonic immunopathology. Converse to wildtype counterparts, Psae colonized the intestines of IL-10-/- mice with chronic colitis following peroral challenge, but did not lead to changes in intestinal microbiota composition...
April 27, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29701657/characterization-of-silver-nanomaterials-derived-from-marine-streptomyces-sp-al-dhabi-87-and-its-in-vitro-application-against-multidrug-resistant-and-extended-spectrum-beta-lactamase-clinical-pathogens
#19
Naif Abdullah Al-Dhabi, Abdul-Kareem Mohammed Ghilan, Mariadhas Valan Arasu
A novel antagonistic marine Streptomyces sp. Al-Dhabi-87 that was recovered from the Gulf region of Saudi Arabia was used to synthesize silver nanoparticles (NP) from the culture free extract. The produced NP were confirmed by UV-visible spectroscopy (UV-Vis), high-resolution scanning electron microscope (HRSEM), transmission electron microscope (TEM), Fourier-transform infrared spectroscopy (FTIR), Energy Dispersive Spectroscopy (EDAX), and X-ray Powder Diffraction (XRD), and broth micro dilution techniques were employed for the determination of minimum inhibitory concentrations (MIC) values...
April 26, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29697286/vaccines-for-healthcare-associated-infections-present-future-and-expectations
#20
Amandine Gagneux-Brunon, Frédéric Lucht, Odile Launay, Philippe Berthelot, Elisabeth Botelho-Nevers
In spite of the widespread implementation of preventive strategies, the prevalence of healthcare-associated infections (HAIs) remains high. HAIs are associated with multidrug resistant organisms, and in the post-antibiotic era, alternative strategies such as vaccines are needed for their management. Areas covered: Vaccines to prevent HAIs could be proposed to at-risk patients, or to healthcare workers (HCWs) to prevent cross-transmission. After searches in Pubmed and clinicaltrials.gov, existing vaccines and vaccines under clinical development are presented in this narrative review...
May 7, 2018: Expert Review of Vaccines
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