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Polymyxin-b

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https://www.readbyqxmd.com/read/29340720/correction-to-polymyxin-b-immobilized-hemoperfusion-and-mortality-in-critically-ill-adult-patients-with-sepsis-septic-shock-a-systematic-review-with-meta-analysis-and-trial-sequential-analysis
#1
Tomoko Fujii, Riki Ganeko, Yuki Kataoka, Toshi A Furukawa, Robin Featherstone, Kent Doi, Jean-Louis Vincent, Daniela Pasero, René Robert, Claudio Ronco, Sean M Bagshaw
Owing to an oversight by the authors, Figure 2 in this article was not the version intended for publication. The correct Figure 2, reproduced here, features footnote symbols and Figure 2b includes three studies as described in the main text.
January 16, 2018: Intensive Care Medicine
https://www.readbyqxmd.com/read/29340452/detection-of-multidrug-resistant-pseudomonas-aeruginosa-harboring-bla-ges-1-and-bla-ges-11-in-recife-brazil
#2
Valdemir Vicente da Silva Júnior, Laura Durão Ferreira, Lílian Rodrigues Alves, Adriane Borges Cabral, Paula Regina Luna de Araújo Jácome, Paulo Sérgio Ramos de Araújo, Ana Catarina de Souza Lopes, Maria Amélia Vieira Maciel
INTRODUCTION: Pseudomonas aeruginosa, an important pathogen globally, presents several resistance mechanisms. This study aimed to investigate the presence of bla GES in clinical isolates of Pseudomonas aeruginosa obtained from various clinical specimens from patients admitted to three different hospitals in Recife, Brazil. The Guiana extended spectrum beta-lactamase (GES) enzymes are responsible for conferring broad spectrum resistance to beta-lactam drugs, including the carbapenems. METHODS: A total of 100 carbapenem-resistant P...
November 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/29339386/pterostilbene-a-potential-mcr-1-inhibitor-that-enhances-the-efficacy-of-polymyxin-b
#3
Yonglin Zhou, Shui Liu, Tingting Wang, Hui Li, Shusheng Tang, Jianfeng Wang, Yang Wang, Xuming Deng
We characterized pterostilbene produced a synergistic effect with polymyxin B (FIC index=0.156 or 0.188) against MCR-producing Escherichia coli strains of both human and animal origin. The time-killing assays showed that either pterostilbene or polymyxin B failed to eradicate a mcr-1- and NDM-positive E. coli strain ZJ487, but the combination eliminated by 1-hour post-inoculation. The survival rate of mouse following the intraperitoneal infection significantly promoted from 0% to 60% in the group of combination therapy applied...
January 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29319510/metallo-beta-lactamase-producing-pseudomonas-aeruginosa-in-a-healthcare-setting-in-alexandria-egypt
#4
Amani F Abaza, Soraya A El Shazly, Heba S A Selim, Gehan S A Aly
Pseudomonas aeruginosa has emerged as a major healthcare associated pathogen that creates a serious public health disaster in both developing and developed countries. In this work we aimed at studying the occurrence of metallo-beta-lactamase (MBL) producing P. aeruginosa in a healthcare setting in Alexandria, Egypt. This cross sectional study included 1583 clinical samples that were collected from patients admitted to Alexandria University Students' Hospital. P. aeruginosa isolates were identified using standard microbiological methods and were tested for their antimicrobial susceptibility patterns using single disc diffusion method according to the Clinical and Laboratory Standards Institute recommendations...
September 27, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/29319449/management-and-closure-of-multiple-large-cutaneous-lesions-in-a-juvenile-cat-with-severe-acquired-skin-fragility-syndrome-secondary-to-iatrogenic-hyperadrenocorticism
#5
C Noël McKnight, Linda J Lew, David A Gamble
CASE DESCRIPTION A 13-month-old castrated male cat was evaluated for a large, spontaneously developed cutaneous laceration over the left scapular region. The cat had a history of severe gingivostomatitis, conjunctivitis, giardiasis, and feline herpesvirus infection and had received systemic glucocorticoid treatment for 7 weeks prior to evaluation. CLINICAL FINDINGS Physical examination revealed a 10 × 7-cm full-thickness cutaneous laceration over the left scapular region, extremely thin skin, crusts over the dorsal aspect of the neck and base of the skull, medially curling pinnae, and moderate gingivostomatitis...
January 15, 2018: Journal of the American Veterinary Medical Association
https://www.readbyqxmd.com/read/29315029/correlations-among-resistances-to-different-antimicrobial-compounds-in-salmonella-strains-from-hen-eggshells
#6
Maria Luisa Fernández Márquez, María José Grande Burgos, Rubén Pérez Pulido, Antonio Gálvez, Rosario Lucas López
Persistence of antibiotic-resistant Salmonella in the food chain may depend on strain tolerance to other antimicrobials and also on biofilm formation capacity. Yet, there is limited information on sensitivity of antibiotic-resistant Salmonella to other antimicrobials, such as phenolic compounds, chemical preservatives, or antimicrobial peptides. This study aimed at correlating antimicrobial resistance and biofilm formation capacity in antibiotic-resistant, biocide-tolerant Salmonella strains from hen eggshells...
February 2018: Journal of Food Protection
https://www.readbyqxmd.com/read/29311071/population-pharmacokinetics-of-polymyxin-b-in-acutely-ill-adult-patients
#7
Cristina Miglis, Nathaniel J Rhodes, Sean Avedissian, Christine J Kubin, Michael T Yin, Brian Nelson, Manjunath P Pai, Marc H Scheetz
Polymyxin B (PB) has reemerged as a common treatment against multidrug-resistant Gram-negative pathogens. However, nephrotoxicity remains a significant dose-limiting side effect and contemporary pharmacokinetic (PK) data is limited. This study sought to evaluate PB exposure differences in various load and non-loading strategies according to total body weight (TBW) and adjusted body weight (ABW). Patients treated with PB had plasma samples obtained for clinical care and analyzed using LC-MS/MS. Compartmental PK models with linear and allometric scaling of TBW were explored...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29311066/population-pharmacokinetics-of-intravenous-polymyxin-b-from-clinical-samples
#8
Christine J Kubin, Brian C Nelson, Cristina Miglis, Marc H Scheetz, Nathaniel Rhodes, Sean Avedissian, Serge Cremers, Michael T Yin
A retrospective study was conducted in hospitalized patients receiving intravenous polymyxin B who underwent therapeutic drug monitoring during treatment. The aim of this study was to assess the population pharmacokinetics (PK) of intravenous polymyxin B in patients with variable total body weights and create a population model for clinical use. Nonlinear mixed-effects modeling analyses were performed. A total of 43 patients were included: 70% were male with a median age of 58 years and a median weight of 78 kg...
January 8, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29308749/-2017-clinical-breakthroughs-in-critical-care-medicine
#9
Wei Huang
New achievements in critical care medicine 2017 may include updating of "Surviving Sepsis Campaign" international guideline. Comparing evaluation of sequential (sepsis-related) organ failure assessment (SOFA) and quick sequential organ failure assessment (qSOFA), combination therapies with steroid, vitamin B1 and vitamin C in patients with sepsis, identification of endophenotype of sepsis, as well phenotype of acute respiratory distress syndrome (ARDS). However, it is also need to mention some of negative trials, such as levosimendan in patients undergoing cardiac surgery, low-dose immunoglobulin G and polymyxin B hemoperfusion for patient with septic shock, and enteral versus parenteral early nutrition in ventilated adults with shock...
January 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/29305954/clinical-use-of-the-polymyxins-the-tale-of-the-fox-and-the-cat
#10
Eric Wenzler, Kristen L Bunnell, Larry H Danziger
BACKGROUND: There is a need to identify practice patterns of polymyxin use, quantify gaps in knowledge, and recognize areas of persistent confusion. METHODS: A structured electronic survey was distributed to physicians, pharmacists, and microbiologists. Demographic information was obtained along with data regarding the availability, stewardship principles, therapeutic usage, dosing, microbiological testing, and knowledge, attitudes, and beliefs regarding the polymyxins...
January 3, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29290748/therapeutic-drug-monitoring-of-prolonged-infusion-aztreonam-for-multi-drug-resistant-pseudomonas-aeruginosa-a-case-report
#11
Jeffrey J Cies, Richard J LaCoursiere, Wayne S Moore, Arun Chopra
Aztreonam, a broad-spectrum monobactam, is typically reserved for multidrug resistant (MDR) infections. Pharmacokinetic (PK) data to guide dosing in children, however, are limited to healthy volunteers or nonintensive care unit (ICU) patients. Impaired antibiotic delivery into tissue remains a major concern and may explain the high morbidity and mortality associated with MDR infections. Therefore, evaluating the PK changes in pediatric ICU patients is necessary to elucidate the most appropriate antimicrobial regimen...
November 2017: Journal of Pediatric Pharmacology and Therapeutics: JPPT: the Official Journal of PPAG
https://www.readbyqxmd.com/read/29281684/candida-albicans-derived-mannoproteins-activate-nf-%C3%AE%C2%BAb-in-reporter-cells-expressing-tlr4-md2-and-cd14
#12
Traci Ness, Mahmud Abdallah, Jaime Adams, Claudia Alvarado, Edwin Gunn, Brittany House, John Lamb, Jack Macguire, Emily Norris, Rebekah Robinson, Morgan Sapp, Jill Sharma, Ronald Garner
The ability of soluble C. albicans 20A (serotype A) mannoprotein (CMP) to serve as a ligand for toll-like receptor 4 (TLR4) and its co-receptors was examined using commercially available and stably-transfected HEK293 cells that express human TLR4, MD2 and CD14, but not MR. These TLR4 reporter cells also express an NF-κB-dependent, secreted embryonic alkaline phosphatase (SEAP) reporter gene. TLR4-reporter cells exhibited a dose-dependent SEAP response to both LPS and CMP, wherein peak activation was achieved after stimulation with 40-50 μg/mL of CMP...
2017: PloS One
https://www.readbyqxmd.com/read/29278732/loading-of-polymyxin-b-onto-anionic-mesoporous-silica-nanoparticles-retains-antibacterial-activity-and-enhances-biocompatibility
#13
Zahra Gounani, Mohammad A Asadollahi, Rikke L Meyer, Ayyoob Arpanaei
Polymyxin B is a polycationic antibiotic used as the last line treatment against antibiotic-resistant Gram negative bacteria. However, application of polymyxin B is limited because of its toxicity effects. Herein, we used bare and surface modified mesoporous silica nanoparticles (MSNs) with an average diameter of 72.29 ± 8.17 nm as adsorbent for polymyxin B to improve its therapeutic properties. The polymyxin B adsorption onto MSN surfaces was explained as a function of pH, type of buffer and surface charge of nanoparticles, according to the ζ-potential of silica nanoparticles and adsorption kinetics results...
December 24, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29246635/the-evaluation-of-immunogenic-impact-of-selected-bacterial-recombinant-hsp60-antigens-in-dba-2j-mice
#14
Joanna Bajzert, Michał Gorczykowski, Józef Galli, Tadeusz Stefaniak
Heat Shock Proteins (HSP) are highly conserved proteins that are widely spread throughout all organisms. They function in the cytoplasm as chaperones; however, they could be expressed on the cell surface. It has been shown that Hsp60 obtained from gram-negative bacteria are able to stimulate cells of the acquired and innate immune system. The aim of this study was the evaluation of the immunogenic properties of recombinant Hsp60 proteins derived from four common pathogenic bacteria: Escherichia coli, Histophilus somni, Pasteurella multocida and Salmonella Enteritidis...
December 12, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29238962/population-pharmacokinetics-of-polymyxin-b
#15
Pooja Manchandani, Visanu Thamlikitkul, Yanina Dubrovskaya, Jessica T Babic, David C Lye, Lawrence S Lee, Vincent H Tam
Polymyxin B is used as a last treatment resort for multidrug-resistant Gram-negative bacterial infections. The objectives of this study were to examine the population pharmacokinetics of polymyxin B and investigate factor(s) influencing pharmacokinetic variability. Four serial blood samples each were collected from 35 adult patients at steady state. The concentrations of individual polymyxin B components were analyzed using a validated liquid chromatography / tandem mass spectrometry assay and combined to derive total concentrations...
December 14, 2017: Clinical Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/29235272/real-time-detection-of-antibiotic-activity-by-measuring-nanometer-scale-bacterial-deformation
#16
Rafael Iriya, Karan Syal, Wenwen Jing, Manni Mo, Hui Yu, Shelley E Haydel, Shaopeng Wang, Nongjian Tao
Diagnosing antibiotic-resistant bacteria currently requires sensitive detection of phenotypic changes associated with antibiotic action on bacteria. Here, we present an optical imaging-based approach to quantify bacterial membrane deformation as a phenotypic feature in real-time with a nanometer scale (∼9  nm) detection limit. Using this approach, we found two types of antibiotic-induced membrane deformations in different bacterial strains: polymyxin B induced relatively uniform spatial deformation of Escherichia coli O157:H7 cells leading to change in cellular volume and ampicillin-induced localized spatial deformation leading to the formation of bulges or protrusions on uropathogenic E...
December 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29226922/a-polymyxin-b-silver-nanoparticle-colloidal-system-and-the-application-of-lipopolysaccharide-analysis
#17
Tao Liu, Liqian Gao, Jing Zhao, Ya Cao, Yuguo Tang, Peng Miao
Polymyxin B (PMB) is a small cyclic polycationic lipopeptide, which can be used as an antibiotic drug against Gram-negative bacteria. In this work, the interaction between citrate capped silver nanoparticles (AgNPs) and PMB is studied. Experimental results show that the association constant is extremely high and the binding event leads to a significant variation in the localized surface plasmon resonance (LSPR) of AgNPs. Moreover, the PMB-AgNP colloidal system can be further exploited as a sensitive analytical platform...
December 11, 2017: Analyst
https://www.readbyqxmd.com/read/29224710/spm-1-producing-pseudomonas-aeruginosa-st277-clone-recovered-from-microbiota-of-migratory-birds
#18
Willames M B S Martins, Ana Clara Narciso, Rodrigo Cayô, Stéfanie Vanessa Santos, Lorena C C Fehlberg, Patrícia Locosque Ramos, João Batista da Cruz, Ana Cristina Gales
The production of São Paulo metallo-β-lactamase (SPM-1) is the most common carbapenem resistance mechanism detected among multidrug-resistant Pseudomonas aeruginosa clinical isolates in Brazil. Dissemination of SPM-1-producing P. aeruginosa has been restricted to the nosocomial settings, with sporadic reports of environmental isolates due to contamination by hospital sewage. Herein, we described the detection and molecular characterization of SPM-1-producing P. aeruginosa recovered from the microbiota of migratory birds in Brazil...
November 10, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29223553/lipopolysaccharide-induces-autophagy-by-targeting-the-ampk-mtor-pathway-in-human-nasal-epithelial-cells
#19
Xue-Hai Wang, Zhong-Hua Zhang, Xiao-Lan Cai, Ping Ye, Xin Feng, Ting-Ting Liu, Xue-Zhong Li
Chronic rhinosinusitis (CRS) is a well-known disease encountered in the department of otorhinolaryngology, yet little is known about its pathogenesis. Autophagy, a lysosome-dependent degradation process, has been reported to be involved in the process of many chronic inflammatory diseases. Here we tried to evaluate the function of autophagy in CRS as well as explore the related mechanisms. We first stained light chain 3B (LC3B) with immunohistochemistry in uncinate tissues (UT) from patients with and without CRS and found that its expression was up-regulated in CRS patients...
December 6, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29221222/polymyxin-b-hemoperfusion-in-septic-shock-nothing-overmuch-meden-agan
#20
EDITORIAL
Stavroula Ilia, Panagiotis Briassoulis, George Briassoulis
No abstract text is available yet for this article.
September 2017: Journal of Thoracic Disease
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