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https://www.readbyqxmd.com/read/29665883/plasmid-mediated-colistin-resistance-in-animals-current-status-and-future-directions
#1
Jian Sun, Ximin Zeng, Xing-Ping Li, Xiao-Ping Liao, Ya-Hong Liu, Jun Lin
Colistin, a peptide antibiotic belonging to the polymyxin family, is one of the last effective drugs for the treatment of multidrug resistant Gram-negative infections. Recent discovery of a novel mobile colistin resistance gene, mcr-1, from people and food animals has caused a significant public health concern and drawn worldwide attention. Extensive usage of colistin in food animals has been proposed as a major driving force for the emergence and transmission of mcr-1; thus, there is a worldwide trend to limit colistin usage in animal production...
December 2017: Animal Health Research Reviews
https://www.readbyqxmd.com/read/29665289/a-whole-body-physiologically-based-pharmacokinetic-model-for-colistin-and-colistin-methanesulfonate-cms-in-rat
#2
Salim Bouchene, Sandrine Marchand, William Couet, Lena E Friberg, Patrice Gobin, Isabelle Lamarche, Nicolas Grégoire, Sven Björkman, Mats O Karlsson
Colistin is a polymyxin antibiotic used to treat patients infected with multidrug-resistant Gram negative bacteria (MDR-GNB). The objective of this work was to develop a whole-body physiologically based pharmacokinetic (WB-PBPK) model to predict tissue distribution of colistin in rat. The distribution of a drug in a tissue is commonly characterized by its tissue-to-plasma partition coefficient, Kp . Colistin and its prodrug, colistin methanesulfonate (CMS) Kp priors were measured experimentally from rat tissue homogenates or predicted in silico...
April 17, 2018: Basic & Clinical Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29626525/whole-genome-sequence-of-an-mcr-1-carrying-esbl-producing-escherichia-coli-st746-isolate-recovered-from-community-acquired-urinary-tract-infection
#3
Lingjiao Wu, Jing Chen, Li Wang, Zhe Wu
OBJECTIVES: Colistin is regarded as one of the last-resort antimicrobials for severe infections. Plasmid-borne mobile colistin resistance gene (mcr-1)-carrying isolates were rarely reported in community-acquired infections. Here we report the draft genome sequence of an MCR-1-carrying, extended-spectrum β-lactamase (ESBL)-producing Escherichia coli isolate from community-acquired urinary tract infection. MTHODS: Antimicrobial susceptibility tests (AST) were determined by the broth microdilution method...
April 4, 2018: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/29623443/pharmacokinetic-and-pharmacodynamic-considerations-of-antibiotics-of-last-resort-in-treating-gram-negative-infections-in-adult-critically-ill-patients
#4
REVIEW
Mojdeh S Heavner, Kimberly C Claeys, Anne M Masich, Jeffrey P Gonzales
PURPOSE OF REVIEW: We provide an overview of antimicrobials that are considered last resort for the treatment of resistant gram-negative infections in adult critically ill patients. The role in therapy, pharmacodynamic (PD) goals, and pharmacokinetic (PK) changes in critical illness for aminoglycosides, polymyxins, tigecycline, fosfomycin, and fluoroquinolones are summarized. RECENT FINDINGS: Altered PK in septic patients in the intensive care unit (ICU) is observed with many of our agents of last resort...
April 5, 2018: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/29619335/role-of-neomycin-polymyxin-sulfate-solution-bladder-wash-for-prevention-of-catheter-associated-urinary-tract-infection-in-traumatic-brain-injury-patient-admitted-to-intensive-care-unit-a-prospective-randomized-study
#5
Neeraj Kumar, Yashpal Singh, Ghanshyam Yadav, S K Mathur, Umesh Kumar Bhadani
Background: Catheter - associated urinary tract infection (CAUTI) remains a critical threat for patients in intensive care unit especially in traumatic brain injury patients with low Glasgow coma score (GCS). Almost all patients in ICU receive antibiotic either prophylactic or therapeutic based on local antibiogram of particular ICU or hospital. For prophylaxis, systemic antibiotics are used. It will be helpful to avoid systemic side effects by introducing antibiotics locally through bladder irrigation...
January 2018: International Journal of Critical Illness and Injury Science
https://www.readbyqxmd.com/read/29611663/antimicrobial-susceptibility-of-salmonella-spp-strains-isolated-from-free-living-birds
#6
M Krawiec, S Rusiecki, M Kuczkowski, A Wieliczko
Salmonella is one of the most common causes of food poisoning in the European Union and the United States of America. Free-living birds are known as a reservoir for the different serovars of Salmonella, including S. Typhimurium, S. Enteritidis, S. Infantis, S. Newport and S. Hadar, which may play an important role in the epidemiology of salmonellosis in farm animals, particularly poultry. Also, the antibiotic resistance of Salmonella spp. is a growing, public health emergency. In the present study, the authors examined 36 Salmonella spp...
December 2017: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/29581252/global-increase-and-geographic-convergence-in-antibiotic-consumption-between-2000-and-2015
#7
Eili Y Klein, Thomas P Van Boeckel, Elena M Martinez, Suraj Pant, Sumanth Gandra, Simon A Levin, Herman Goossens, Ramanan Laxminarayan
Tracking antibiotic consumption patterns over time and across countries could inform policies to optimize antibiotic prescribing and minimize antibiotic resistance, such as setting and enforcing per capita consumption targets or aiding investments in alternatives to antibiotics. In this study, we analyzed the trends and drivers of antibiotic consumption from 2000 to 2015 in 76 countries and projected total global antibiotic consumption through 2030. Between 2000 and 2015, antibiotic consumption, expressed in defined daily doses (DDD), increased 65% (21...
March 26, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29575185/identification-of-vim-2-metallo-%C3%AE-lactamase-producing-pseudomonas-aeruginosa-isolated-from-dogs-with-pyoderma-and-otitis-in-korea
#8
Jae-Eun Hyun, Tae-Ho Chung, Cheol-Yong Hwang
BACKGROUND: Pseudomonas aeruginosa is a challenging pathogen cultured from cases of acute and chronic canine otitis and sometimes in cases of deep pyoderma. The spread of antimicrobial resistance, especially carbapenem resistance, is a serious therapeutic challenge worldwide. HYPOTHESIS/OBJECTIVES: To investigate the identification and characterization of resistant P. aeruginosa clinical canine isolates. MATERIALS: Clinical isolates (n = 80) were collected from dogs with pyoderma (n = 18) and otitis (n = 62) in Korea...
March 25, 2018: Veterinary Dermatology
https://www.readbyqxmd.com/read/29566483/sputum-active-polymyxin-lipopeptides-activity-against-cystic-fibrosis-pseudomonas-aeruginosa-isolates-and-their-interactions-with-sputum-biomolecules
#9
Elena K Schneider-Futschik, Olivia K A Paulin, Daniel Hoyer, Kade D Roberts, James Ziogas, Mark A Baker, John Karas, Jian Li, Tony Velkov
The mucoid biofilm mode of growth of Pseudomonas aeruginosa in the lungs of cystic fibrosis patients makes eradication of infections with antibiotic therapy very difficult. The lipopeptide antibiotics polymyxin B and colistin are currently the last-resort therapies for infections caused by multidrug-resistant P. aeruginosa. In the present study, we investigated the antibacterial activity of a series of polymyxin lipopeptides (polymyxin B, colistin, FADDI-003, octapeptin A3 and polymyxin A2) against a panel of polymyxin-susceptible and polymyxin-resistant P...
March 22, 2018: ACS Infectious Diseases
https://www.readbyqxmd.com/read/29556720/polymyxin-b-causes-dna-damage-in-hk-2-cells-and-mice
#10
B Yun, T Zhang, M A K Azad, J Wang, C J Nowell, P Kalitsis, T Velkov, D F Hudson, J Li
Increasing incidence of multidrug-resistant bacteria presents an imminent risk to global health. Polymyxins are 'last-resort' antibiotics against Gram-negative 'superbugs'; however, nephrotoxicity remains a key impediment in their clinical use. Molecular mechanisms underlying this nephrotoxicity remain poorly defined. Here, we examined the pathways which led to polymyxin B induced cell death in vitro and in vivo. Human proximal tubular cells were treated with polymyxin B (12.5-100 μM) for up to 24 h and showed a significant increase in micronuclei frequency, as well as abnormal mitotic events (over 40% in treated cells, p < 0...
March 20, 2018: Archives of Toxicology
https://www.readbyqxmd.com/read/29554105/sub-minimum-inhibitory-concentrations-of-colistin-and-polymyxin-b-promote-acinetobacter-baumannii-biofilm-formation
#11
Yoshinori Sato, Yuka Unno, Tsuneyuki Ubagai, Yasuo Ono
We investigated the numbers of planktonic and biofilm cells and the expression levels of genes encoding efflux pumps and biofilm-related proteins in 10 clinical isolates of multi-drug resistant Acinetobacter baumannii (MDRA) as well as in its standard strain ATCC 19606 in the presence of colistin (CST), polymyxin B (PMB), minomycin (MIN), and tigecycline (TGC) at their respective sub-MICs. The number of planktonic and biofilm cells of ATCC 19606 decreased in the presence of all aforementioned antibiotics in a dose-dependent manner...
2018: PloS One
https://www.readbyqxmd.com/read/29529934/screening-of-potential-lead-molecules-against-prioritized-targets-of-multi-drug-resistant-acinetobacter-baumannii-insights-from-molecular-docking-molecular-dynamic-simulations-and-in-vitro-assays
#12
Sinosh Skariyachan, Meghna Manjunath, Nikhil Bachappanavar
Acinetobacter baumannii, an opportunistic pathogen, has become multi-drug resistant (MDR) to major classes of antibacterial and poses grave threat to public health. The current study focused to screen novel phytotherapeutics against prioritized targets of Acinetobacter baumannii by computational investigation. Fourteen potential drug targets were screened based on their functional role in various biosynthetic pathways and the three dimensional structures of nine targets were retrieved from Protein Data Bank and others were computationally predicted...
March 12, 2018: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29525421/towards-understanding-mcr-like-colistin-resistance
#13
REVIEW
Jian Sun, Huimin Zhang, Ya-Hong Liu, Youjun Feng
Antibiotic resistance has become a global public health priority. Polymyxins, a family of cationic polypeptide antibiotics, act as a final line of refuge against severe infections by Gram-negative pathogens with pan-drug resistance. Unfortunately, this last-resort antibiotic has been challenged by the emergence and global spread of mobilized colistin resistance determinants (mcr). Given the fact that it has triggered extensive concerns worldwide, we present here an updated view of MCR-like colistin resistance...
March 7, 2018: Trends in Microbiology
https://www.readbyqxmd.com/read/29524060/chromosomally-encoded-and-plasmid-mediated-polymyxins-resistance-in-acinetobacter-baumannii-a-huge-public-health-threat
#14
REVIEW
William Gustavo Lima, Mara Cristina Alves, Waleska Stephanie Cruz, Magna Cristina Paiva
Acinetobacter baumannii is an opportunistic pathogen associated with nosocomial and community infections of great clinical relevance. Its ability to rapidly develop resistance to antimicrobials, especially carbapenems, has re-boosted the prescription and use of polymyxins. However, the emergence of strains resistant to these antimicrobials is becoming a critical issue in several regions of the world because very few of currently available antibiotics are effective in these cases. This review summarizes the most up-to-date knowledge about chromosomally encoded and plasmid-mediated polymyxins resistance in A...
March 9, 2018: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/29514937/an-improved-medium-for-colistin-susceptibility-testing
#15
Konrad Gwozdzinski, Saina Azarderakhsh, Can Imirzalioglu, Linda Falgenhauer, Trinad Chakraborty
The plasmid-located colistin resistance gene ( mcr - 1 ) confers low-level resistance to colistin, a last-line antibiotic against multidrug-resistant Gram-negative bacteria. Current EUCAST/CLSI recommendations require the use of a broth microdilution (BMD) method in cation-adjusted Mueller-Hinton (CA-MH) for colistin susceptibility testing, but approximately 15% of all MCR-1-producers classify as sensitive in this medium. Here we report on an improved calcium-enhanced Mueller-Hinton (CE-MH) medium that permits simple and reliable determination of mcr-1 -producing Enterobacteriaceae Colistin susceptibility for 50 mcr-1 -encoding isolates of E...
March 7, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29514208/fitness-cost-of-mcr-1-mediated-polymyxin-resistance-in-klebsiella-pneumoniae
#16
Sue C Nang, Faye C Morris, Michael J McDonald, Mei-Ling Han, Jiping Wang, Richard A Strugnell, Tony Velkov, Jian Li
Objectives: The discovery of mobile colistin resistance mcr-1, a plasmid-borne polymyxin resistance gene, highlights the potential for widespread resistance to the last-line polymyxins. In the present study, we investigated the impact of mcr-1 acquisition on polymyxin resistance and biological fitness in Klebsiella pneumoniae. Methods: K. pneumoniae B5055 was used as the parental strain for the construction of strains carrying vector only (pBBR1MCS-5) and mcr-1 recombinant plasmids (pmcr-1)...
March 5, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29511071/carbapenem-resistant-klebsiella-pneumoniae-exhibiting-clinically-undetected-colistin-heteroresistance-leads-to-treatment-failure-in-a-murine-model-of-infection
#17
Victor I Band, Sarah W Satola, Eileen M Burd, Monica M Farley, Jesse T Jacob, David S Weiss
Antibiotic resistance is a growing crisis and a grave threat to human health. It is projected that antibiotic-resistant infections will lead to 10 million annual deaths worldwide by the year 2050. Among the most significant threats are carbapenem-resistant Enterobacteriaceae (CRE), including carbapenem-resistant Klebsiella pneumoniae (CRKP), which lead to mortality rates as high as 40 to 50%. Few treatment options are available to treat CRKP, and the polymyxin antibiotic colistin is often the "last-line" therapy...
March 6, 2018: MBio
https://www.readbyqxmd.com/read/29510541/a-rapid-and-semi-quantitative-gold-nanoparticles-based-strip-sensor-for-polymyxin-b-sulfate-residues
#18
Yue Li, Liqiang Liu, Shanshan Song, Hua Kuang, Chuanlai Xu
Increasing attention is now being directed to the utilization of polymyxin B (PMB) as a last-line treatment for life-threatening infections caused by multidrug resistant Gram-negative bacteria. Unfortunately, polymyxins resistance is also increasingly reported, leaving a serious threat to human health. Therefore, the establishment of rapid detection methods for PMB residues is highly essential to ensure public health. In this study, two monoclonal antibodies (mAb; 2A2 and 3C6) were obtained using PMB-bovine serum albumin as the immunogen and PMB-ovalbumin as the coating antigen, which were prepared with N -(γ-maleimidobutyryloxy) succinimide ester and glutaraldehyde as cross-linking agents, respectively...
March 5, 2018: Nanomaterials
https://www.readbyqxmd.com/read/29501823/multidrug-resistant-shigella-sonnei-carrying-plasmid-mediated-mcr-1-gene-in-china
#19
Qiuxia Ma, Yong Huang, Jian Wang, Xuebin Xu, Jane Hawkey, Chaojie Yang, Beibei Liang, Xiaofeng Hu, Fuli Wu, Xiaoxia Yang, Jinyan Wang, Rongrui Li, Peng Li, Jing Xie, Leili Jia, Ligui Wang, Rongzhang Hao, Yigang Tong, Kathryn E Holt, Shaofu Qiu, Yansong Sun, Hongbin Song
Since the plasmid-mediated polymyxin resistance gene mcr-1 was first reported in Escherichia coli and Klebsiella pneumoniae in China, only one mcr-1-positive isolate of Shigella sonnei, containing inactivated mcr-1, has been reported worldwide. Here, we screened 1650 historical S. sonnei strains isolated from 2003 to 2015 in China for mcr-1. We determined the antimicrobial susceptibilities and resistance genes of mcr-1-positive isolates and investigated the transferability of polymyxin resistance by plasmid conjugation...
February 28, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29501820/identification-and-bio-evaluation-of-sri-12742-as-a-antimicrobial-agent-against-multi-drug-resistant-acinetobacter-baumannii
#20
Manjulika Shukla, Isha Soni, Karen Matsuyama, Tran Tran, Mary Tanga, Leyi Gong, Sidharth Chopra
INTRODUCTION: Multidrug-resistant Acinetobacter baumannii (MDR-AB) is one of the most significant nosocomial pathogens, that is increasingly being isolated in healthcare settings worldwide. Owing to its inherent drug-resistant nature, coupled with its ability to readily acquire resistance to other antibiotic classes, there is a real dearth of antibiotics available to treat infections with MDR-AB. MATERIALS AND METHODS: A commercially available library was screened against MDR-AB BAA-1605 to identify novel inhibitory molecules...
February 28, 2018: International Journal of Antimicrobial Agents
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