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Aminoglycoside

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https://www.readbyqxmd.com/read/28223390/expression-of-the-aac-6-ib-cr-gene-in-class-1-integrons
#1
Sophie Raherison, Thomas Jove, Margaux Gaschet, Emilie Pinault, Aurore Tabesse, Carmen Torres, Marie-Cécile Ploy
The aac(6')-Ib-cr is a plasmid-mediated quinolone resistance (PMQR) gene embedded within a gene cassette, most often within an integron. It confers resistance to both quinolones and aminoglycosides. We investigated the role of a 101-bp fragment frequently present upstream of the aac(6')-Ib-cr gene cassette and found it contributes to the expression of aac(6')-Ib-cr and provides an alternative START codon confirming the length of the AAC(6')-Ib-cr protein to 199-aa.
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28223374/enterobacter-cloacae-complex-isolates-harboring-blanmc-a-or-blaimi-type-class-a-carbapenemase-genes-on-novel-chromosomal-integrative-elements-and-plasmids
#2
David A Boyd, Laura F Mataseje, Ross Davidson, Johannes A Delport, Jeff Fuller, Linda Hoang, Brigitte Lefebvre, Paul Levett, Diane L Roscoe, Barbara M Willey, Michael R Mulvey
Carbapenem-resistant Enterobacter cloacae complex isolates submitted to a reference laboratory from 2010 to 2015 were screened by PCR for seven common carbapenemase gene groups, namely, KPC, NDM, OXA-48, VIM, IMP, GES, and NMC-A/IMI. Nineteen of the submitted isolates (1.7%) were found to harbor Ambler class A blaNMC-A or blaIMI-type carbapenemases. All 19 isolates were resistant to at least one carbapenem but susceptible to aminoglycosides, trimethoprim-sulfamethoxazole, tigecycline, and ciprofloxacin. Most isolates (17/19) gave positive results with the Carba-NP test for phenotypic carbapenemase detection...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28217442/whole-genome-sequencing-and-analysis-of-campylobacter-coli-yh502-from-retail-chicken-reveals-a-plasmid-borne-type-vi-secretion-system
#3
Sandeep Ghatak, Yiping He, Sue Reed, Terence Strobaugh, Peter Irwin
Campylobacter is a major cause of foodborne illnesses worldwide. Campylobacter infections, commonly caused by ingestion of undercooked poultry and meat products, can lead to gastroenteritis and chronic reactive arthritis in humans. Whole genome sequencing (WGS) is a powerful technology that provides comprehensive genetic information about bacteria and is increasingly being applied to study foodborne pathogens: e.g., evolution, epidemiology/outbreak investigation, and detection. Herein we report the complete genome sequence of Campylobacter coli strain YH502 isolated from retail chicken in the United States...
March 2017: Genomics Data
https://www.readbyqxmd.com/read/28212755/stimulating-central-carbon-metabolism-to-re-sensitize-pseudomonas-aeruginosa-to-aminoglycosides
#4
Dorival Martins, Dao Nguyen
In this issue of Cell Chemical Biology, Meylan et al. (2017) examine how stimulation of central carbon metabolism of Pseudomonas aeruginosa modulates aminoglycoside lethality in tolerant bacteria. They identify fumarate as a tobramycin potentiator that stimulates proton motive force-dependent drug uptake and increases respiration-dependent killing.
February 16, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28210248/coexistence-of-blaoxa-48-and-truncated-blandm-1-on-different-plasmids-in-a-klebsiella-pneumoniae-isolate-in-china
#5
Lianyan Xie, Yi Dou, Kaixin Zhou, Yue Chen, Lizhong Han, Xiaokui Guo, Jingyong Sun
Objectives: To describe the genetic environment, transferability, and antibiotic susceptibility of one clinical Klebsiella pneumoniae isolate harboring both blaOXA-48 and blaNDM-1 on different plasmids from a Chinese hospital. Methods: The isolate was subjected to antimicrobial susceptibility testing and multilocus sequence typing using Etest and PCR. The plasmids harboring blaOXA-48 and blaNDM-1 were analyzed through conjugation experiments, S1-nuclease pulsed-field gel electrophoresis, and hybridization with specific probes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28207768/prevalence-of-mdr-pathogens-of-bacterial-meningitis-in-egypt-and-new-synergistic-antibiotic-combinations
#6
Mona M Abdelkader, Khaled M Aboshanab, Marwa A El-Ashry, Mohammad M Aboulwafa
The aim of this study was identifying bacterial pathogens involved in meningitis, studying their antibiotic resistance profiles, investigating the antibiotic resistance genes as well as evaluating the use of various antibiotic combinations. Antibiotic susceptibility tests were evaluated according to CLSI guidelines. Antibiotic combinations were evaluated by calculating the Fractional Inhibitory Concentration (FIC) index. A total of 71 bacterial isolates were recovered from 68 culture positive CSF specimens...
2017: PloS One
https://www.readbyqxmd.com/read/28204495/early-in-vitro-development-of-daptomycin-non-susceptibility-in-high-level-aminoglycoside-resistant-enterococcus-faecalis-predicts-the-efficacy-of-the-combination-of-high-dose-daptomycin-plus-ampicillin-in-an-in-vivo-model-of-experimental-endocarditis
#7
J M Pericàs, C García-de-la-Mària, M Brunet, Y Armero, J García-González, G Casals, M Almela, E Quintana, C Falces, S Ninot, D Fuster, J Llopis, F Marco, A Moreno, J M Miró
No abstract text is available yet for this article.
February 14, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28198501/effect-of-gjb2-235delc-and-30-35delg-genetic-polymorphisms-on-risk-of-congenital-deafness-in-a-chinese-population
#8
Y Xiong, M Zhong, J Chen, Y L Yan, X F Lin, X Li
Congenital deafness is a serious and irreversible condition in humans. The GJB2 gene is implicated in the pathogenesis of autosomal recessive nonsyndromic hearing loss. Its 235delC and 30-35delG polymorphisms are reported to be associated with risk of hereditary deafness. However, the effect of the interaction between GJB2 235delC and 30-35delG and environmental factors on congenital deafness has not been described. Therefore, we performed a case-control study to investigate the influence of these polymorphisms on congenital deafness risk, and their interaction with maternal and other environmental factors in the development of this disease...
February 8, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28197902/neuropsychiatric-effects-of-antimicrobial-agents
#9
REVIEW
Nicholas Zareifopoulos, George Panayiotakopoulos
Antimicrobial drugs used in clinical practice are selected on the basis of their selective toxicity against bacterial cells. However, all exhibit multiple offsite interactions with eukaryotic cell structures, resulting in adverse reactions during antimicrobial pharmacotherapy. A multitude of these side effects involve the nervous system as antimicrobials at clinically relevant concentrations seem to interact with many of the same molecules usually implicated in the action of psychotropic drugs. The importance of such events cannot be overstated, as the misdiagnosis of an adverse drug reaction as a symptom of a primary psychiatric or neurological disorder entails great suffering for the patient affected as well as significant costs for the healthcare system...
February 14, 2017: Clinical Drug Investigation
https://www.readbyqxmd.com/read/28197140/molecular-characteristics-of-carbapenem-resistant-enterobacter-cloacae-in-ningxia-province-china
#10
Zhiyun Shi, Huizheng Zhao, Gang Li, Wei Jia
The emergence of carbapenem-resistant Enterobacteriaceae (CRE) has become a major public health concern worldwide and a new challenge in the treatment of infectious diseases. The molecular characteristics of Enterobacter cloacae in Ningxia China are unknown. In this study, we reported 10 carbapenem-resistant E. cloacae isolates from the General Hospital of Ningxia Medical University, the largest university hospital in Ningxia between January 2012 and December 2013. Bacteria isolates were identified by Vitek2 compact and the identity of non-duplicate E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28194411/antibiotic-resistance-of-campylobacter-recovered-from-faeces-and-carcasses-of-healthy-livestock
#11
Akosua B Karikari, Kwasi Obiri-Danso, Enoch H Frimpong, Karen A Krogfelt
Campylobacter is of major significance in food safety and human and veterinary medicine. This study highlighted resistance situation in the area of veterinary public health in Ghana. Using selective mCCDA agar, isolates were confirmed phenotypically on API CAMPY and genotypically by multiplex PCR of IpxA gene. The susceptibility profile of species to common and relevant antibiotics was determined by the Kirby-Bauer disk diffusion method. Cattle, sheep, goat, and pig faecal samples analysed, respectively, yielded 13...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28193669/overexpression-of-smedef-efflux-pump-decreases-aminoglycoside-resistance-in-stenotrophomonas-maltophilia
#12
Yi-Wei Huang, Cheng-Wen Lin, Hsiao-Chen Ning, Yi-Tsung Lin, Yi-Chih Chang, Tsuey-Ching Yang
The SmeDEF pump of Stenotrophomonas maltophilia is negatively regulated by SmeT. Strains KJΔT (smeT deletion mutant) and KJT-D(m) (mutant with defective SmeT-binding site) showed increased resistance to chloramphenicol/nalidixic acid/macrolides and susceptibility to aminoglycoside. Overexpression of the SmeDEF pump, in either KJΔT or KJT-D(m), downregulated smeYZ expression, which is responsible for the reduced aminoglycoside resistance. Furthermore, the SmeRySy two-component regulatory system was downregulated in response to SmeDFE overexpression, supporting its involvement in the regulatory circuit...
February 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28192916/combating-enhanced-intracellular-survival-eis-mediated-kanamycin-resistance-of-mycobacterium-tuberculosis-by-novel-pyrrolo-1-5-a-pyrazine-based-eis-inhibitors
#13
Atefeh Garzan, Melisa J Willby, Huy X Ngo, Chathurada S Gajadeera, Keith D Green, Selina Y L Holbrook, Caixia Hou, James E Posey, Oleg V Tsodikov, Sylvie Garneau-Tsodikova
Tuberculosis (TB) remains one of the leading causes of mortality worldwide. Hence, the identification of highly effective antitubercular drugs with novel modes of action is crucial. In this paper, we report the discovery and development of pyrrolo[1,5-a]pyrazine-based analogues as highly potent inhibitors of the Mycobacterium tuberculosis (Mtb) acetyltransferase enhanced intracellular survival (Eis), whose up-regulation causes clinically observed resistance to the aminoglycoside (AG) antibiotic kanamycin A (KAN)...
February 17, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28191309/co-existence-of-blaoxa-23-and-blandm-1-genes-of-acinetobacter-baumannii-isolated-from-nepal-antimicrobial-resistance-and-clinical-significance
#14
Prabhu Raj Joshi, Mahesh Acharya, Trishna Kakshapati, Udomluk Leungtongkam, Rapee Thummeepak, Sutthirat Sitthisak
BACKGROUND: Molecular analysis of carbapenem-resistant genes in Acinetobacter baumannii, an emerging pathogen, is less commonly reported from Nepal. In this study we determined the antibiotic susceptibility profile and genetic mechanism of carbapenem resistance in clinical isolates of A. baumannii. METHODS: A. baumannii were isolated from various clinical specimens and identified based on Gram staining, biochemical tests, and PCR amplification of organism specific 16S rRNA and blaOXA-51 genes...
2017: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/28185617/mycobacterium-kansasii
#15
James C Johnston, Leslie Chiang, Kevin Elwood
The incidence of Mycobacterium kansasii varies widely over time and by region, but this organism remains one of the most clinically relevant isolated species of nontuberculous mycobacteria. In contrast to other common nontuberculous mycobacteria, M. kansasii is infrequently isolated from natural water sources or soil. The major reservoir appears to be tap water. Infection is likely acquired through the aerosol route, with low infectivity in regions of endemicity. Human-to-human transmission is thought not to occur...
January 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28184305/once-daily-aerosolised-tobramycin-in-adult-patients-with-cystic-fibrosis-in-the-management-of-pseudomonas-aeruginosa-chronic-infection
#16
Marco Mantero, Andrea Gramegna, Giovanna Pizzamiglio, Alice D'Adda, Paolo Tarsia, Francesco Blasi
It is estimated that about 60-70% of Cystic Fibrosis patients develop Pseudomonas aeruginosa chronic infection, with progressive loss of lung function, as well as increased antibiotic resistance and mortality. The current strategy is to maintain lung function by chronic suppressive antipseudomonas antibiotic therapy. Tobramycin inhalation solution was the first approved aerosolised antibiotic to be used against P. aeruginosa; inhalatory tobramycin frequency of administration is twice daily and inhalation time is estimated to be 15 to 20 min...
2017: Multidisciplinary Respiratory Medicine
https://www.readbyqxmd.com/read/28167856/prevalence-of-high-level-gentamicin-resistant-enterococcus-faecalis-and-enterococcus-faecium-in-an-iranian-hospital
#17
M Emaneini, B Khoramian, F Jabalameli, R Beigverdi, K Asadollahi, M Taherikalani, A R Lari
This study was designed to determine the molecular characteristics and antimicrobial resistance of enterococcal strains isolated from patients admitted to an Iranian Hospital. Enterococcal strains were isolated from the burn patients. All strains were screened for genes encoding resistance to aminoglycoside [aac(6')-Ie-aph(2'')-Ia, aph (3'), ant (4')], resistance to vancomycin (vanA, vanB), resistance to tetracycline (tetK, tetL, tetM, tetO), and resistance to erythromycin (ermA, ermB, ermC) by PCR and multiplex PCR-based methods...
December 2016: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28166656/combination-of-ceftriaxone-and-ampicillin-for-the-treatment-of-enterococcal-endocarditis
#18
Shaylee C Peterson, Tim T Y Lau, Mary H H Ensom
OBJECTIVE: The aim of this systematic review is to review all human trials assessing the efficacy and safety of ampicillin and ceftriaxone for enterococcal endocarditis and to discuss the clinical implications of the findings. DATA SOURCES: MEDLINE (1946-), EMBASE (1974-), CENTRAL, Google Scholar, and the World Health Organization Clinical Trials Registry Platform were searched through January 2017 using the search terms ampicillin, penicillin, ceftriaxone, cephalosporin, enterococ*, and endocarditis...
February 1, 2017: Annals of Pharmacotherapy
https://www.readbyqxmd.com/read/28164482/noninvasive-test-for-mitochondrial-dna-a1555g-mutation-associated-with-deafness
#19
Wenlu Fan, Yi Zhu, Xiaowen Tang, Ling Xue
BACKGROUND: The homoplasmic mitochondrial DNA (mtDNA) A1555G mutation in the highly conserved decoding site of 12S rRNA has been associated with aminoglycoside-induced and nonsyndromic hearing loss in many families worldwide. The A1555G mutation detection is an important part of hearing screening. At present, blood samples are the most common source of genomic DNA. However, drawing blood is invasive for individuals. METHODS: The whole genomic DNA of samples carrying mitochondrial DNA A1555G mutation (LX010 and LX044) with aminoglycoside-induced and nonsyndromic deafness as well as wild type were used as templates...
January 1, 2017: Clinical Laboratory
https://www.readbyqxmd.com/read/28162962/in-vitro-synergistic-antibacterial-activity-of-the-essential-oil-from-zingiber-cassumunar-roxb-against-extensively-drug-resistant-acinetobacter-baumannii-strains
#20
Wongwarut Boonyanugomol, Kairin Kraisriwattana, Kamolchanok Rukseree, Kraisorn Boonsam, Panchaporn Narachai
In this study, we determined the antibacterial and synergistic activities of the essential oil from Zingiber cassumunar against the extensively drug-resistant (XDR) Acinetobacter baumannii strains. The antibacterial and synergistic properties of the essential oil from Z. cassumunar were examined by agar disc diffusion tests. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) were evaluated by broth microdilution using the resazurin assay. The in vitro time-kill antibacterial kinetics was analyzed using the plate count technique...
February 2, 2017: Journal of Infection and Public Health
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