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Polymyxins

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https://www.readbyqxmd.com/read/28636788/role-of-positively-charged-residues-on-the-polar-and-non-polar-faces-of-amphipathic-%C3%AE-helical-antimicrobial-peptides-amps-on-specificity-and-selectivity-for-gram-negative-pathogens
#1
Ziqing Jiang, Colin T Mant, Michael Vasil, Robert S Hodges
We have designed de novo and synthesized eight 26-residue all D-conformation amphipathic α-helical cationic antimicrobial peptides (AMPs), four with "specificity determinants" which provide specificity for prokaryotic cells over eukaryotic cells and four AMPs without specificity determinants. The eight AMPs contain six positively charged Lys residues on the polar face in four different arrangements to understand the role of these residues have on antimicrobial activity against 14 Acinetobacter baumannii strains, 7 of which were resistant to polymyxin B and colistin; 6 diverse Pseudomonas aeruginosa strains and 17 Staphylococcus aureus strains, 9 of which were Methicillin-sensitive (MSSA) and 8 of which were Methicillin-resistant (MRSA)...
June 21, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28629080/efficient-megalin-targeted-delivery-to-renal-proximal-tubular-cells-mediated-by-modified-polymyxin-b-polyethylenimine-based-nano-gene-carriers
#2
Fatemeh Oroojalian, Ali Hossein Rezayan, Faramarz Mehrnejad, Azadeh Hashem Nia, Wayne Thomas Shier, Khalil Abnous, Mohammad Ramezani
Non-viral vectors have attracted great interest, as they are simple to prepare, easy to modify and relatively safe, compared to viral vectors. Kidney-targeted gene delivery systems depict a promising technology to improve drug efficacy in renal diseases treatments. In order to develop a novel kidney-targeted gene delivery system, we synthesized polyamine-PEI conjugates using polymyxin B as ligand and investigated their potential targeting efficiency. After grafting either PEI25 kDa or PEI10 kDa with polymyxin B through amidation reaction, the modified-polymyxin-PEI/DNA-nanoplexes were produced via electrostatic attraction between the cationic polymers and EGFP plasmid...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28628170/recent-advances-and-perspectives-in-the-design-and-development-of-polymyxins
#3
REVIEW
Francesc Rabanal, Yolanda Cajal
Covering: 1947-early 2017, particularly from 2005-early 2017The rise of bacterial pathogens with acquired resistance to almost all available antibiotics is becoming a serious public health issue. Polymyxins, antibiotics that were mostly abandoned a few decades ago because of toxicity concerns, are ultimately considered as a last-line therapy to treat infections caused by multi-drug resistant Gram-negative bacteria. This review surveys the progress in understanding polymyxin structure, and their chemistry, mechanisms of antibacterial activity and nephrotoxicity, biomarkers, synergy and combination with other antimicrobial agents and antibiofilm properties...
June 19, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28616507/the-first-report-of-escherichia-fergusonii-isolated-from-non-human-primates-in-africa
#4
Barbara Glover, Jeanette Wentzel, Akinbowale Jenkins, Moritz Van Vuuren
The aim of this study was to determine the resistance phenotypes of selected enteric bacteria isolated from non-human primates at a wildlife-human interface. Bacterial isolates from faecal samples of non-human primates at two wildlife rehabilitation centres in South Africa were screened for the presence of Escherichia coli. The biochemical characterisation of E. coli and E. coli-like bacteria revealed both adonitol positive and sorbitol negative strains - a unique characteristic of Escherichia fergusonii and Escherichia coli K99...
June 2017: One Health
https://www.readbyqxmd.com/read/28615078/characterisation-of-roseomonas-mucosa-isolated-from-the-root-canal-of-an-infected-tooth
#5
Nina Diesendorf, Stefanie Köhler, Walter Geißdörfer, Tanja Grobecker-Karl, Matthias Karl, Andreas Burkovski
OBJECTIVE: The genus Roseomonas comprises a group of pink-pigmented, slow-growing, aerobic, non-fermentative Gram-negative bacteria, which have been isolated from environmental sources such as water and soil, but are also associated with human infections. In the study presented here, Roseomonas mucosa was identified for the first time as part of the endodontic microbiota of an infected root canal and characterised in respect to growth, antibiotic susceptibility and biofilm formation. RESULTS: The isolated R...
June 14, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28608297/neomycin-polymyxin-b-and-dexamethasone-allergic-reactions-following-periocular-surgery
#6
Nicholas A Moore, Craig N Czyz, Tracy D Carter, Jill A Foster, Kenneth V Cahill
BACKGROUND: The aim of this study was to evaluate the rate of periocular allergic skin reactions to topical neomycin, polymyxin B, and dexamethasone (NPD) ophthalmic ointment. METHODS: A consecutive patient prospective study was performed. A total of 522 patients who had a procedure involving incision of the periocular skin with subsequent postoperative application of NPD ophthalmic ointment were included. Patients were evaluated for signs of allergy at 1 week postoperatively or prior if the patient had complaints...
December 2017: Journal of Ophthalmic Inflammation and Infection
https://www.readbyqxmd.com/read/28607018/antibiotic-mediated-modulations-of-outer-membrane-vesicles-in-enterohemorrhagic-escherichia-coli-o104-h4-and-o157-h7
#7
Andreas Bauwens, Lisa Kunsmann, Helge Karch, Alexander Mellmann, Martina Bielaszewska
Ciprofloxacin, meropenem, fosfomycin, and polymyxin B strongly increase production of outer membrane vesicles (OMVs) in Escherichia coli O104:H4 and O157:H7. Ciprofloxacin also upregulates OMV-associated Shiga toxin 2a, the major virulence factor of these pathogens, whereas the other antibiotics increase OMV production without the toxin. Both these effects might worsen the clinical outcome of infections caused by Shiga toxin-producing E. coli Our data support the existing recommendations to avoid antibiotics for treatment of these infections...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28606644/comparison-of-methods-for-detection-of-plasmid-mediated-and-chromosomally-encoded-colistin-resistance-in-enterobacteriaceae
#8
Aurélie Jayol, Patrice Nordmann, Philippe Lehours, Laurent Poirel, Véronique Dubois
OBJECTIVES: Because of the emergence of plasmid-mediated (mcr-1 and mcr-2 genes) and chromosomally-encoded colistin resistance, reliable methods for detecting colistin resistance/susceptibility in routine laboratories are required. We evaluated the respective performances of the BD Phoenix automated system, the newly-developed Rapid Polymyxin NP test and the broth microdilution (BMD) reference method to detect colistin resistance in Enterobacteriaceae, and particularly those producing MCR-1 and MCR-2...
June 9, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28605374/laboratory-techniques-used-to-maintain-and-differentiate-biotypes-of-vibrio-cholerae-clinical-and-environmental-isolates
#9
Kyle D Brumfield, Bailey M Carignan, Jordan N Ray, Panagiota E Jumpre, Mike S Son
The aquatic Gram-negative bacterium Vibrio cholerae is the etiological agent of the infectious gastrointestinal disease cholera. Due to the global prevalence and severity of this disease, V. cholerae has been extensively studied in both environmental and laboratory settings, requiring proper maintenance and culturing techniques. Classical and El Tor are two main biotypes that compose the V. cholerae O1 serogroup, each displaying unique genotypic and phenotypic characteristics that provide reliable mechanisms for biotype characterization, and require distinct virulence inducing culturing conditions...
May 30, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28601867/novel-insights-into-the-direct-removal-of-endotoxin-by-polymyxin-b-hemoperfusion
#10
Alexander D Romaschin, Christina V Obiezu-Forster, Hisataka Shoji, David J Klein
AIM: To demonstrate the capacity of polymyxin B-direct hemoperfusion (PMX-DHP) column Toraymyxin® 20R (PMX-20R) in removing endotoxin (LPS) from perfused blood, serum and plasma. METHODS: Endotoxin-spiked bovine serum or plasma was perfused in PMX-20R as per the recommended performance testing protocol. Samples were taken at various time points to assess the amount of endotoxin removed during a 4-h session. In another set of experiments, FITC-labelled LPS (FITC-LPS) was spiked into a pool of human whole blood, followed by perfusion with the spiked blood for 2 h in order to allow FITC-LPS to bind PMX-20R...
June 10, 2017: Blood Purification
https://www.readbyqxmd.com/read/28600615/clinical-study-of-blood-purification-therapy-in-critical-care-in-japan-results-from-the-survey-research-of-the-japan-society-for-blood-purification-in-critical-care-in-2013
#11
Toshiaki Arimura, Masanori Abe, Hidetoshi Shiga, Hiroshi Katayama, Kazo Kaizu, Shigeto Oda
To clarify the clinical status of blood purification therapy (BPT) in critical care in Japan, we conducted a cohort study using data from a nationwide registry of the Japan Society for Blood Purification in Critical Care in 2013. We enrolled 2227 patients treated with BPT (female, 39.1%; mean age, 65.5 ± 12.1 years) in the intensive care units of 43 facilities. Patient characteristics, modes of BPT, and survival rate for each disease were investigated. In total, BPT was performed 3053 times. Continuous renal replacement therapy (CRRT) (57...
June 9, 2017: Journal of Artificial Organs: the Official Journal of the Japanese Society for Artificial Organs
https://www.readbyqxmd.com/read/28597511/successful-treatment-of-enterohemorrhagic-escherichia-coli-induced-acute-encephalopathy-and-hemolytic-uremic-syndrome-with-polymyxin-b-direct-hemoperfusion
#12
Hisashi Kaneda, Masaki Shimizu, Akihiro Yachie
No abstract text is available yet for this article.
June 8, 2017: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/28592552/colistin-and-polymyxin-b-susceptibility-testing-for-carbapenem-resistant-and-mcr-positive-enterobacteriaceae-comparison-of-sensititre-microscan-vitek-2-and-etest-with-broth-microdilution
#13
Ka Lip Chew, My-Van La, Raymond T P Lin, Jeanette W P Teo
Colistin and polymyxin B remain part of the last line of antibiotics for multi-drug-resistant Gram negative bacteria such as carbapenem-resistant-Enterobacteriaceae Current EUCAST-CLSI joint recommendations are for broth microdilution to be performed for MIC testing of colistin. Commercial susceptibility testing methods were evaluated and compared against reference broth microdilution (BMD), using a susceptible breakpoint of ≤2mg/L for both colistin and polymyxin B. Seventy-six Enterobacteriaceae were included, of which twenty-one were mcr-1 positive...
June 7, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28592318/potential-survival-benefit-of-polymyxin-b-hemoperfusion-in-patients-with-septic-shock-a-propensity-matched-cohort-study
#14
Yoshihiko Nakamura, Taisuke Kitamura, Fumiaki Kiyomi, Mineji Hayakawa, Kota Hoshino, Yasumasa Kawano, Reiko Yamasaki, Takeshi Nishida, Mariko Mizunuma, Hiroyasu Ishikura
BACKGROUND: The purpose of this study was to investigate whether polymyxin B hemoperfusion (PMX-HP) improves the survival of patients with septic shock. METHODS: This was a retrospective, multicenter study conducted on patients treated during a 3-year period. We performed propensity-score analyses of the Japan Septic Disseminated Intravascular Coagulation (JSEPTIC DIC) study database. The study included data on 1723 patients with septic shock aged 16 years or older...
June 7, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28590820/activity-of-ceftazidime-avibactam-against-clinical-isolates-of-klebsiella-pneumoniae-including-kpc-carrying-isolates-endemic-to-new-york-city
#15
Nyla Manning, Gregory Balabanian, Michael Rose, David Landman, John Quale
In this report, we examined the (1) activity of ceftazidime-avibactam against clinical isolates Klebsiella pneumoniae, including those harboring blaKPC, (2) potential mechanisms leading to reduced susceptibility, and (3) activity of ceftazidime-avibactam when combined with other agents. Of 802 carbapenem-resistant isolates of K. pneumoniae gathered from New York City from 1999 to 2014, all were susceptible to ceftazidime-avibactam. Minimum inhibitory concentrations (MICs) were higher in isolates with K. pneumoniae, with the carbapenemase (KPC)-3 (compared to KPC-2), and those with a frameshift mutation in ompK35...
June 7, 2017: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/28589262/the-surgical-outcomes-of-lung-cancer-combined-with-interstitial-pneumonia-a-single-institution-report
#16
Daisuke Taniguchi, Naoya Yamasaki, Takuro Miyazaki, Tomoshi Tsuchiya, Keitaro Matsumoto, Go Hatachi, Tomoyuki Kakugawa, Noriho Sakamoto, Hiroshi Mukae, Takeshi Nagayasu
PURPOSE: Several studies have reported that an acute exacerbation (AE) of idiopathic interstitial pneumonia (IIP) can occur after lung resection in patients with non-small cell lung cancer (NSCLC); however, the perioperative management strategy is controversial. METHODS: The data of lung cancer patients at Nagasaki University Hospital from June 1994 to October 2013 were retrospectively reviewed. RESULTS: Among all 1701 NSCLC patients who underwent lung resection, 59 (3...
June 6, 2017: Surgery Today
https://www.readbyqxmd.com/read/28586429/hafnia-an-enterobacterial-genus-naturally-resistant-to-colistin-revealed-by-three-susceptibility-testing-methods
#17
Aurélie Jayol, Marion Saly, Patrice Nordmann, Armelle Ménard, Laurent Poirel, Véronique Dubois
Objectives: To determine the susceptibility to colistin of Hafnia alvei and Hafnia paralvei , and to compare methods for colistin resistance detection in the Hafnia genus. Methods: A collection of 25 Hafnia isolates was studied. Species were identified by using 16S rRNA gene sequencing with subsequent phylogeny analysis. Susceptibility to colistin was determined using the broth microdilution (BMD) reference method, the Phoenix automated system, the Rapid Polymyxin NP test, the Etest system and the disc diffusion method...
June 6, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28584102/crystal-structures-of-the-burkholderia-multivorans-hopanoid-transporter-hpnn
#18
Nitin Kumar, Chih-Chia Su, Tsung-Han Chou, Abhijith Radhakrishnan, Jared A Delmar, Kanagalaghatta R Rajashankar, Edward W Yu
Strains of the Burkholderia cepacia complex (Bcc) are Gram-negative opportunisitic bacteria that are capable of causing serious diseases, mainly in immunocompromised individuals. Bcc pathogens are intrinsically resistant to multiple antibiotics, including β-lactams, aminoglycosides, fluoroquinolones, and polymyxins. They are major pathogens in patients with cystic fibrosis (CF) and can cause severe necrotizing pneumonia, which is often fatal. Hopanoid biosynthesis is one of the major mechanisms involved in multiple antimicrobial resistance of Bcc pathogens...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28583381/synergistic-activities-of-meropenem-double-and-triple-combinations-against-carbapenemase-producing-enterobacteriaceae
#19
Marlene Fredborg, Teis E Sondergaard, Mikala Wang
The increasing emergence of carbapenemase-producing Enterobacteriaceae poses a considerable threat to global health as only limited treatment options are available and has therefore led to efforts to discover antibiotic combination regimens effective. The aim of this study was to evaluate in vitro synergistic activity of 10 meropenem double and triple combinations against the 5 most frequently encountered carbapenemases-producing Enterobacteriaceae. Broth microdilution assays showed that the meropenem and ertapenem combination was the most efficient regimen of the double combinations tested (>5-log2 fold decrease)...
May 3, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28578555/infections-due-to-acinetobacter-baumannii-in-the-icu-treatment-options
#20
Joseph P Lynch, George G Zhanel, Nina M Clark
Bacteria within the genus Acinetobacter (principally A. baumannii-calcoaceticus complex [ABC]) are gram-negative coccobacilli that may cause nosocomial infections in critically ill or debilitated patients (particularly ventilator-associated pneumonia and infections of the bloodstream, urinary tract, and wounds). Treatment of Acinetobacter infections is difficult, as Acinetobacter spp. are intrinsically resistant to multiple antimicrobial agents, and have a remarkable ability to acquire new resistance determinants via mechanisms that include plasmids, transposons, integrons, and resistance islands...
June 2017: Seminars in Respiratory and Critical Care Medicine
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