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https://www.readbyqxmd.com/read/28630202/identifying-spectra-of-activity-and-therapeutic-niches-for-ceftazidime-avibactam-and-imipenem-relebactam-against-carbapenem-resistant-enterobacteriaceae
#1
Ghady Haidar, Cornelius J Clancy, Liang Chen, Palash Samanta, Ryan K Shields, Barry N Kreiswirth, M Hong Nguyen
We determined imipenem, imipenem-relebactam, ceftazidime and ceftazidime-avibactam minimum inhibitory concentrations (MICs) against 100 CRE isolates that underwent whole genome sequencing. KPCs were the most common carbapenemases. Forty-six isolates carried ESBLs. With the addition of relebactam, imipenem susceptibility increased from 8% to 88%. With the addition of avibactam, ceftazidime susceptibility increased from 0% to 85%. Neither imipenem-relebactam nor ceftazidime-avibactam was active against MBL-producers...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28614760/abundance-of-carbapenemase-genes-blakpc-blandm-and-blaoxa-48-in-wastewater-effluents-from-tunisian-hospitals
#2
Emna Nasri, Jessica Subirats, Alexandre Sànchez-Melsió, Hedi Ben Mansour, Carles M Borrego, José Luis Balcázar
Carbapenems are β-lactam antibiotics with a broad spectrum of activity and are usually considered the last resort for the treatment of severe infections caused by multidrug-resistant pathogens. The clinically most significant carbapenemases are KPC, NDM, and OXA-48-like enzymes, whose genes have been increasingly reported worldwide in members of the family Enterobacteriaceae. In this study, we quantified the abundance of these genes in wastewater effluents from different Tunisian hospitals. The blaNDM and blaOXA-48-like genes were detected at similar concentrations in all hospital wastewater effluents...
June 11, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28614623/a-carbon-dot-based-fluorescent-nanosensor-for-simple-visualization-of-bacterial-nucleic-acids
#3
Ha Neul Lee, Jea-Sung Ryu, Cheong Shin, Hyun Jung Chung
A simple and facile method for sensing of nucleic acids is in great need for disease biomarker detection and diagnosis. Herein, a fluorescent nanosensor utilizing carbon dot nanoparticles is introduced that form visible precipitates in the presence of target DNA. Carbon dot nanoparticles are fabricated by microwave pyrolysis of polyethylenimine, which emits strong photoluminescence and can form precipitates when added to target DNA oligonucleotides. The precipitates can be easily visualized by UV illumination, and data can be acquired as images using a smartphone, which are analyzed for quantification...
June 14, 2017: Macromolecular Bioscience
https://www.readbyqxmd.com/read/28611107/il-6-receptor-blockade-enhances-chemotherapy-efficacy-in-pancreatic-ductal-adenocarcinoma
#4
Kristen B Long, Graham Tooker, Evan Tooker, Santiago Lombo Luque, Jae W Lee, Xiaoqing Pan, Gregory L Beatty
Inflammation mediated by activation of Janus kinase/signal transducer and activator of transcription (JAK/STAT) signaling is a major cause of chemotherapy resistance in cancer. We studied the impact of selectively blocking the IL-6 receptor (IL6R) as a strategy to inhibit IL-6-induced STAT activation and to overcome chemoresistance in pancreatic ductal adenocarcinoma (PDAC). To do this, STAT activation was investigated in tumors arising spontaneously in LSL-Kras(G12D/+);LSL-Trp53(R172H/+);Pdx-1Cre (KPC) mice...
June 13, 2017: Molecular Cancer Therapeutics
https://www.readbyqxmd.com/read/28605515/fri-2-carbapenemase-producing-enterobacter-cloacae-complex-in-the-uk
#5
Danièle Meunier, Jacqueline Findlay, Michel Doumith, Daniel Godoy, Claire Perry, Rachel Pike, Firza Gronthoud, Theresa Shryane, Laurent Poirel, William Welfare, Neil Woodford, Katie L Hopkins
Objectives: Detection of rarer carbapenemases is challenging, as it requires molecular assays with comprehensive coverage or the use of phenotypic methods for the detection of carbapenemase activity. We describe a new class A carbapenemase, FRI-2, in an Enterobacter cloacae complex isolate following implementation of an in-house multiplex PCR for the detection of 'rare' class A carbapenemases. Methods: MICs were determined by agar dilution. A carbapenem-resistant E...
June 10, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28601655/regulation-of-p27-by-ubiquitin-ligases-and-its-pathological-significance-in-human-lung-carcinomas
#6
Yoh Dobashi, Hiroyoshi Tsubochi, Kentaro Minegishi, Masatoshi Kitagawa, Shinichi Otani, Akishi Ooi
Downregulation of cyclin-dependent kinase inhibitor protein p27, due to enhanced degradation, is frequently observed in various cancers. The ubiquitin ligases that mediate this degradation have been identified as S-phase kinase-associated protein-2 (Skp2), Kip1 ubiquitylation-promoting complex (KPC), and p53-inducible protein with RING-H2 domain (Pirh2) as well. We investigated the correlation among expression of these 3 ligases and p27 status in surgical specimens of human lung carcinomas by immunohistochemical analysis...
June 7, 2017: Human Pathology
https://www.readbyqxmd.com/read/28598078/-the-transmission-of-kpc-2-gene-in-klebsiella-species
#7
Li-Juan Wu, Ting-Ting Wang, Qing-Yan He, Dan Zhao, Si-Shi Tang, Mei Kang, Chao He, Yi Xie
OBJECTIVES: To explore the mechanisms of imipenem resistance inKlebsiella spp. and the transmission of Klebsiella pneumoniae Carbapenemase-2(KPC-2) gene in Klebsiella species. METHODS: The imipenem resistant Klebsiella pneumoniae and Klebsiella oxytoca were isolated in the West China Hospital of Sichuan University in 2009/2010 and 2012/2013. Their minimal inhibitory concentration (MIC) was determined by agar dilution method. CARB ChromID plate and improved Hodge test were undertaken to detect carbapenemases resistant phenotype...
September 2016: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
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
#8
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/28589468/optimal-treatment-of-jugular-foramen-schwannomas-long-term-outcome-of-a-multidisciplinary-approach-for-a-series-of-29-cases-in-a-single-institute
#9
Sung Mo Ryu, Jung-Il Lee, Kwan Park, Jung Won Choi, Doo-Sik Kong, Do-Hyun Nam, Han-Shin Jeong, Yang-Sun Cho, Ho Jun Seol
BACKGROUND: The goal of treatment for jugular foramen schwannomas (JFSs) is to achieve complete tumor removal with cranial nerve preservation. However, achieving this goal remains a challenge despite the advances in microsurgical techniques. The aim of this study was to determine optimal treatment strategies for JFSs based on a review of a series of 29 surgical cases in our institute. MATERIALS AND METHODS: Between 1997 and 2013, 29 patients with JFSs underwent surgical treatment by multidisciplinary otoneurosurgical approaches...
June 6, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/28586386/differential-th17-response-induced-by-the-two-clades-of-the-pandemic-st258-klebsiella-pneumoniae-clonal-lineages-producing-kpc-type-carbapenemase
#10
Ann Maria Clemente, Giuseppe Castronovo, Alberto Antonelli, Marco Maria D'Andrea, Michele Tanturli, Eloisa Perissi, Sara Paccosi, Astrid Parenti, Federico Cozzolino, Gian Maria Rossolini, Maria Gabriella Torcia
The spread of KPC-type carbapenemases is mainly attributed to the global dissemination of Klebsiella pneumoniae (KP) strains belonging to the clonal group (CG) 258, including sequence type (ST) 258 and other related STs. Two distinct clades of CG258-KP have evolved, which differ mainly for the composition of their capsular polysaccharides, and recent studies indicate that clade 1 evolved from an ancestor of clade 2 by recombination of a genomic fragment carrying the capsular polysaccharide (cps) locus. In this paper, we investigated the ability of two ST258-KP strains, KKBO-1 and KK207-1, selected as representatives of ST258-KP clade 2 and clade 1, respectively, to activate an adaptive immune response using ex vivo-stimulation of PBMC from normal donors as an experimental model...
2017: PloS One
https://www.readbyqxmd.com/read/28585170/rapid-and-simple-identification-of-carbapenemase-genes-bla-ndm-bla-oxa-48-bla-vim-bla-imp-14-and-bla-kpc-groups-in-gram-negative-bacilli-by-in-house-loop-mediated-isothermal-amplification-with-hydroxynaphthol-blue-dye
#11
Arpasiri Srisrattakarn, Aroonlug Lulitanond, Chotechana Wilailuckana, Nicha Charoensri, Lumyai Wonglakorn, Pimjai Saenjamla, Prajuab Chaimanee, Jureerut Daduang, Aroonwadee Chanawong
Carbapenem-resistant Enterobacteriaceae isolates by carbapenemase production are being reported globally with increasing frequency, leading to limited therapeutic options. We therefore developed a loop-mediated isothermal amplification method with hydroxynaphthol blue dye (LAMP-HNB) for rapid confirmation of bla NDM, bla OXA-48, bla VIM, bla IMP-14 and bla KPC groups. Sixty-two Enterobacteriaceae and Pseudomonas spp. isolates carrying various carbapenemase genes (28 bla NDM-1, 9 bla IMP-14a, 2 bla IMP-48, 1 bla IMP-1, 1 bla IMP-4, 1 bla IMP-9, 1 bla IMP-15, 4 bla VIM-2, 1 bla VIM-1, 1 bla IMP-14a & bla VIM-2, 7 bla KPC-2, 3 bla OXA-48 and 3 bla OXA-181) and 37 non-carbapenemase-producing Enterobacteriaceae isolates as confirmed by the PCR methods were included...
July 2017: World Journal of Microbiology & Biotechnology
https://www.readbyqxmd.com/read/28572684/%C3%AF-bo1e-a-newly-discovered-lytic-bacteriophage-targeting-carbapenemase-producing-klebsiella-pneumoniae-of-the-pandemic-clonal-group-258-clade-ii-lineage
#12
Marco Maria D'Andrea, Pasquale Marmo, Lucia Henrici De Angelis, Mattia Palmieri, Nagaia Ciacci, Gustavo Di Lallo, Elisa Demattè, Elisa Vannuccini, Pietro Lupetti, Gian Maria Rossolini, Maria Cristina Thaller
The pandemic dissemination of KPC carbapenemase-producing Klebsiella pneumoniae (KPC-KP) represents a major public health problem, given their extensive multidrug resistance profiles and primary role in causing healthcare-associated infections. This phenomenon has largely been contributed by strains of Clonal Group (CG) 258, mostly of clade II, which in some areas represent the majority of KPC-KP isolates. Here we have characterized a newly discovered lytic Podoviridae, named φBO1E, targeting KPC-KP strains of clade II lineage of CG258...
June 1, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28566732/peptide-markers-for-rapid-detection-of-kpc-carbapenemase-by-lc-ms-ms
#13
Honghui Wang, Steven K Drake, Jung-Ho Youn, Avi Z Rosenberg, Yong Chen, Marjan Gucek, Anthony F Suffredini, John P Dekker
Carbapenemase producing organisms (CPOs) represent an urgent public health threat, and the need for new rapid methods to detect these organisms has been widely recognized. CPOs carrying the Klebsiella pneumoniae carbapenemase (bla KPC ) gene have caused outbreaks globally with substantial attributable mortality. Here we describe the validation of a rapid MS method for the direct detection of unique tryptic peptides of the KPC protein in clinical bacterial isolates with an isolate-to-result time of less than 90 minutes...
May 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28562752/phenotypic-methods-for-screening-carbapenem-resistant-enterobacteriaceae-and-assessment-of-their-antimicrobial-susceptibility-profile
#14
Danielly da Costa Silva, Roberta Filipini Rampelotto, Vinícius Victor Lorenzoni, Silvana Oliveira Dos Santos, Juliana Damer, Manfredo Hörner, Rosmari Hörner
INTRODUCTION: In this study, we used phenotypic methods to screen carbapenem-resistant Enterobacteriaceae (CREs) and evaluated their antimicrobial sensitivity profile. METHODS: One hundred and seventy-eight CREs were isolated at a university hospital in south Brazil in a one-year period. Samples were assessed using disk diffusion tests with inhibitors of β-lactamases such as phenylboronic acid (AFB), cloxacillin (CLOXA), and ethylenediaminetetraacetic acid (EDTA)...
March 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28560183/outbreak-by-hypermucoviscous-klebsiella-pneumoniae-st11-isolates-with-carbapenem-resistance-in-a-tertiary-hospital-in-china
#15
Lingling Zhan, Shanshan Wang, Yinjuan Guo, Ye Jin, Jingjing Duan, Zhihao Hao, Jingnan Lv, Xiuqin Qi, Longhua Hu, Liang Chen, Barry N Kreiswirth, Rong Zhang, Jingye Pan, Liangxing Wang, Fangyou Yu
Hypervirulent and multidrug resistant Klebsiella pneumoniae strains pose a significant threat to the public health. In the present study, 21 carbapenem-resistant K. pneumoniae isolates (CRKP) were determined by the string test as hypermucoviscous K. pneumoniae (HMKP), with the prevalence of 15.0% (21/140) among CRKP, and 1.1% (21/1838) among all K. pneumoniae isolates. Among them, 7 (33.3%), and 1 (4.76%) isolate belonged to capsular serotype K20 and K2 respectively, while 13 (61.9%, 13/21) weren't successfully typed by capsular serotyping...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28559268/circulation-of-blakpc-3-carrying-incx3-plasmids-among-c-freundii-isolates-in-an-italian-hospital
#16
Carolina Venditti, Daniela Fortini, Laura Villa, Antonella Vulcano, Silvia D'Arezzo, Alessandro Capone, Nicola Petrosillo, Carla Nisii, Alessandra Carattoli, Antonino Di Caro
Colonisations due to carbapenem-resistant Enterobacteriaceae (CRE) are a source of antimicrobial resistance transmission in healthcare settings. Eleven Citrobacter freundii strains producing KPC-3 carbapenemase were isolated from rectal swabs during a three-year surveillance programme. In 9/11 strains, blaKPC-3-carrying plasmids were found to belong to the IncX3 group and complete nucleotide sequences were obtained for two of them. Our results highlight the possible role of C. freundii as reservoir of resistance genes...
May 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28559250/ceftazidime-avibactam-is-superior-to-other-treatment-regimens-against-carbapenem-resistant-klebsiella-pneumoniae-bacteremia
#17
Ryan K Shields, M Hong Nguyen, Liang Chen, Ellen G Press, Brian A Potoski, Rachel V Marini, Yohei Doi, Barry N Kreiswirth, Cornelius J Clancy
There are no data comparing outcomes of patients treated with ceftazidime-avibactam vs. comparators for carbapenem-resistant Enterobacteriaceae infections. At our center, ceftazidime-avibactam treatment of carbapenem-resistant Klebsiella pneumoniae bacteremia was associated with higher rates of clinical success (P=0.006) and survival (P=0.01) than other regimens. Across treatment groups, there were no differences in underlying diseases, severity of illness, source of bacteremia, or strain characteristics (97% were KPC-producing)...
May 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28559247/mortality-associated-with-bacteremia-due-to-colistin-resistant-klebsiella-pneumoniae-with-high-level-meropenem-resistance-importance-of-combination-therapy-without-colistin-and-carbapenems
#18
Isabel Machuca, Belén Gutiérrez-Gutiérrez, Irene Gracia-Ahufinger, Francisco Rivera Espinar, Ángela Cano, Julia Guzmán-Puche, Elena Pérez-Nadales, Clara Natera, Marina Rodríguez, Rafael León, Juan J Castón, Fernando Rodríguez-López, Jesús Rodríguez-Baño, Julián Torre-Cisneros
Background. Combination therapy including colistin and a carbapenem has been found to be associated with lower mortality in the treatment of bloodstream infections (BSI) due to KPC-producing Klebsiella pneumoniae (KPCKP) when the isolates show a meropenem or imipenem MIC < 16 mg/L. However, the optimal treatment of BSI caused by colistin and high level carbapenem-resistant KPCKP is unknown. Methods.A prospective cohort study including episodes of bacteremia caused by colistin-resistant and high-level meropenem-resistant (MIC ≥ 64 mg/L) KPCKP diagnosed from July 2012 to February 2016 was performed...
May 30, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28555403/dissemination-of-bla-oxa-370-gene-among-several-enterobacteriaceae-species-in-brazil
#19
C M Magagnin, F P Rozales, L Antochevis, L S Nunes, A S Martins, A L Barth, J M Sampaio, A P Zavascki
OXA-370 is a recently described OXA-48 variant that has only been described in a few Enterobacter spp. and Klebsiella pneumoniae isolates. The purpose of this study is to assess the prevalence of OXA-370-producing isolates in carbapenem-nonsusceptible Enterobacteriaceae recovered from 28 hospitals from Brazil. Real-time PCR was used to determine the presence of bla NDM-1, bla KPC-2, bla VIM-type, bla GES-type, bla OXA-48-like, and bla IMP-type genes. A total of 4,451 Enterobacteriaceae were screened. The gene bla OXA-48-like was detected in 74 (2...
May 30, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28552659/antimicrobial-activity-evaluation-and-comparison-of-methods-of-susceptibility-for-klebsiella-pneumoniae-carbapenemase-kpc-producing-enterobacter-spp-isolates
#20
Daniele Zendrini Rechenchoski, Angélica Marim Lopes Dambrozio, Ana Carolina Polano Vivan, Paulo Alfonso Schuroff, Tatiane das Neves Burgos, Marsileni Pelisson, Marcia Regina Eches Perugini, Eliana Carolina Vespero
The production of KPC (Klebsiella pneumoniae carbapenemase) is the major mechanism of resistance to carbapenem agents in enterobacterias. In this context, forty KPC-producing Enterobacter spp. clinical isolates were studied. It was evaluated the activity of antimicrobial agents: polymyxin B, tigecycline, ertapenem, imipenem and meropenem, and was performed a comparison of the methodologies used to determine the susceptibility: broth microdilution, Etest(®) (bioMérieux), Vitek 2(®) automated system (bioMérieux) and disc diffusion...
May 10, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
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