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https://www.readbyqxmd.com/read/28334005/multi-scale-model-of-drug-induced-adaptive-resistance-of-gram-negative-bacteria-to-polymyxin-b
#1
Wojciech Krzyzanski, Gauri G Rao
The purpose of this report is to apply multi-scale modeling using the theory of physiologically structured populations (PSP) to develop a mathematical model for antimicrobial resistance based on a heterogeneous distribution of receptors and affinities among bacterial cells. The theory has been tested on data obtained from an in vitro static time-kill infection model analyzing the pharmacodynamics of polymyxin B against Gram-negative bacteria. The drug binding parameter KD (dissociation equilibrium constant) is assumed to vary between the bacterial cells...
2017: PloS One
https://www.readbyqxmd.com/read/28331426/environmental-distribution-and-drug-susceptibility-of-achromobacter-xylosoxidans-isolated-from-outdoor-and-indoor-environments
#2
Sachiko Nakamoto, Misaki Sakamoto, Kana Sugimura, Yuki Honmura, Yuki Yamamoto, Natsumi Goda, Hiroo Tamaki, Naoto Burioka
Achromobacter xylosoxidans is an environmental bacterium with multi-drug resistance. We isolated Achromobacter xylosoxidans and investigated its susceptibility to 13 drugs. Seventy-eight water samples were collected from rivers and ponds, and 11 samples were swabbed from residential sinks and baths. Nine strains of Achromobacter xylosoxidans were isolated from the 89 samples. Five strains, including 2 that were sampled from residential homes, showed high resistance to multiple aminoglycosides. This indicated that Achromobacter xylosoxidans is widely distributed in various outdoor and indoor environments...
March 2017: Yonago Acta Medica
https://www.readbyqxmd.com/read/28328161/synthesis-in-vitro-evaluation-and-68-ga-radiolabeling-of-cdp1-towards-pet-ct-imaging-of-bacterial-infection
#3
Jyotibon Dutta, Sooraj Baijnath, Anou M Somboro, Savania Nagiah, Fernando Albericio, Beatriz G de la Torre, Biljana Marjanovic-Painter, Jan Rijn Zeevaart, Mike Sathekge, Hendrik G Kruger, Anil Chuturgoon, Tricia Naicker, Thomas Ebenhan, Thavendran Govender
Bacterial infections are a major concern in the human health sector due to poor diagnosis and development of multi drug resistant strains. PET/CT provides a means for the noninvasive detection and localization of the infectious foci; however, the radiotracers available are either cumbersome to prepare or their exact contribution towards the imaging is not yet established. Human antimicrobial peptides are of interest for development as PET radiotracers as they are an integral component of the immune system, non-immunogenic towards the recipient and show selectivity towards pathogens such as bacteria...
March 22, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28326075/advantages-of-the-silkworm-as-an-animal-model-for-developing-novel-antimicrobial-agents
#4
REVIEW
Suresh Panthee, Atmika Paudel, Hiroshi Hamamoto, Kazuhisa Sekimizu
The demand for novel antibiotics to combat the global spread of multi drug-resistant pathogens continues to grow. Pathogenic bacteria and fungi that cause fatal human infections can also kill silkworms and the infected silkworms can be cured by the same antibiotics used to treat infections in the clinic. As an invertebrate model, silkworm model is characterized by its convenience, low cost, no ethical issues. The presence of conserved immune response and similar pharmacokinetics compared to mammals make silkworm infection model suitable to examine the therapeutic effectiveness of antimicrobial agents...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28326070/antimicrobial-protection-of-marsupial-pouch-young
#5
REVIEW
Yuanyuan Cheng, Katherine Belov
Marsupials diverged from eutherian mammals about 148 million years ago and represent a unique lineage of mammals with distinctive morphological and reproductive characteristics. Marsupials have significantly shorter gestation periods than eutherians. Pregnancy typically ranges from 15 to 35 days, with young being born at a very early developmental stage and lacking differentiated lymphoid tissues and mature effector cells. Recent microbiome studies of the marsupial pouch revealed that marsupial young can face intense microbial challenges after birth, as the pouch contains a broad range of Gram-positive and Gram-negative bacteria...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28321578/silver-embedded-screens-in-the-intensive-care-unit-a-new-tool-to-control-multi-drug-resistant-bacterial-cross-transmission
#6
J Ruiz, P Ramirez, E Villarreal, M Gordon, S Cuesta, M Piñol, J Frasquet, Á Castellanos
The purpose of this study was to assess the effectiveness of silver-embedded surfaces (BactiBlock®) to prevent surface colonization by multi-resistant bacteria (MRB) and to reduce the incidence of MRB colonization and infection in patients admitted to an intensive care unit (ICU). A 6-month prospective observational study in a 24-bed mixed ICU divided into two identical subunits (12 beds each) was designed. Seven solid mobile screens were placed in one of the subunits while in the other cloth screens remained...
March 20, 2017: European Journal of Clinical Microbiology & Infectious Diseases
https://www.readbyqxmd.com/read/28321210/production-of-ramoplanin-and-ramoplanin-analogs-by-actinomycetes
#7
Mercedes de la Cruz, Ignacio González, Craig A Parish, Russell Onishi, José R Tormo, Jesús Martín, Fernando Peláez, Debbie Zink, Noureddine El Aouad, Fernando Reyes, Olga Genilloud, Francisca Vicente
Ramoplanin is a glycolipodepsipeptide antibiotic obtained from fermentation of Actinoplanes sp. ATCC 33076 that exhibits activity against clinically important multi-drug-resistant, Gram-positive pathogens including vancomycin-resistant Enterococcus (VRE), methicillin-resistant Staphylococcus aureus (MRSA), and vancomycin-intermediate resistant Clostridium difficile. It disrupts bacterial cell wall through a unique mechanism of action by sequestering the peptidoglycan intermediate Lipid II and therefore does not show cross-resistance with other antibiotics...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28320357/outcome-of-neurological-early-rehabilitation-patients-carrying-multi-drug-resistant-bacteria-results-from-a-german-multi-center-study
#8
J D Rollnik, M Bertram, C Bucka, M Hartwich, M Jöbges, G Ketter, B Leineweber, M Mertl-Rötzer, D A Nowak, T Platz, K Scheidtmann, R Thomas, F von Rosen, C W Wallesch, H Woldag, P Peschel, J Mehrholz, M Pohl
BACKGROUND: Colonization or infection with multi-drug resistant (MDR) bacteria is considered detrimental to the outcome of neurological and neurosurgical early rehabilitation patients. METHODS: In a German multi-center study, 754 neurological early rehabilitation patients were enrolled and and reviewed in respect to MDR status, length of stay (LOS) and the following outcome variables: Barthel Index (BI), Early Rehabilitation Index (ERI), Glasgow Outcome Score Extended (GOSE), Coma Remission Scale (CRS), Functional Ambulation Categories (FAC)...
March 20, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28319476/anesthesia-in-patients-with-infectious-disease-caused-by-multi-drug-resistant-bacteria
#9
Sharon Einav, Yonit Wiener-Well
PURPOSE OF REVIEW: Up to 50% of specific bacterial strains in healthcare admission facilities are multidrug-resistant organisms (MDROs). Involvement of anesthesiologists in management of patients carrying/at risk of carrying MDROs may decrease transmission in the Operating Room (OR). RECENT FINDINGS: Anesthesiologists, their work area and tools have all been implicated in MDRO outbreaks. Causes include contamination of external ventilation circuits and noncontribution of filters to prevention, inappropriate decontamination procedures for nondisposable equipment (e...
March 17, 2017: Current Opinion in Anaesthesiology
https://www.readbyqxmd.com/read/28306387/help-is-on-the-way-monoclonal-antibody-therapy-for-multi-drug-resistant-bacteria
#10
Rachelle Babb, Liise-Anne Pirofski
No abstract text is available yet for this article.
March 17, 2017: Virulence
https://www.readbyqxmd.com/read/28287735/targeted-antibiotic-delivery-selective-siderophore-conjugation-with-daptomycin-confers-potent-activity-against-multi-drug-resistant-acinetobacter-baumannii-both-in-vitro-and-in-vivo
#11
Manuka Ghosh, Patricia A Miller, Ute Möllmann, William D Claypool, Valerie A Schroeder, William R Wolter, Mark Suckow, Honglin Yu, Shuang Li, Weiqiang Huang, Jaroslav Zajicek, Marvin J Miller
In order to address the dire need for new antibiotics to treat specific strains of drug resistant Gram-negative bacterial infections, a mixed ligand analog of the natural Acinetobacter baumannii selective siderophore, fimsbactin, was coupled to daptomycin, a Gram-positive only antibiotic. The resulting conjugate, 11, has potent activity against multi-drug resistant strains of A. baumannii, both in vitro and in vivo. The study also indicates that conjugation of siderophores to "drugs" that are much larger than the siderophore (iron transport agent) itself facilitates active uptake that circumvents the normal permeability problems in Gram-negative bacteria...
March 13, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28283923/characterization-of-staphylococcus-aureus-in-goose-feces-from-state-parks-in-northeast-ohio
#12
Dipendra Thapaliya, Mark Dalman, Jhalka Kadariya, Katie Little, Victoria Mansell, Mohammed Y Taha, Dylan Grenier, Tara C Smith
Staphylococcus aureus can colonize a range of species. Although numerous studies have isolated pathogenic bacteria from wild birds, very little is known regarding S. aureus and their potential to spread methicillin-resistant (MRSA) strains. The objective of this study was to determine the presence and molecular characteristics of S. aureus in geese fecal samples collected from ten state parks across Northeast Ohio (NEO). A total of 182 fecal samples from Canada geese (Branta canadensis) were collected in April 2015...
March 10, 2017: EcoHealth
https://www.readbyqxmd.com/read/28275372/non-disulfide-bridge-peptide-5-5-from-the-scorpion-hadrurus-gertschi-inhibits-the-growth-of-mycobacterium-abscessus-subsp-massiliense
#13
Monalisa M Trentini, Rogério C das Neves, Bruno de Paula Oliveira Santos, Roosevelt A DaSilva, Adolfo C Barros de Souza, Márcia R Mortari, Elisabeth F Schwartz, André Kipnis, Ana P Junqueira-Kipnis
Multi-drug resistant microorganisms have been a growing concern during the last decades due to their contribution in mortality rates worldwide. Antimicrobial peptides (AMPs) are broad spectrum antimicrobial agents that display potent microbicidal activity against a wide range of microorganisms. AMPs generally have a rapid mode of action that reduces the risk of resistance developing among pathogens. In this study, an AMP derived from scorpion venom, NDBP-5.5, was evaluated against Mycobacterium abscessus subsp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28273965/emergence-of-carbapenem-resistant-non-fermenting-gram-negative-bacilli-isolated-in-an-icu-of-a-tertiary-care-hospital
#14
Sonika Agarwal, Barnali Kakati, Sushant Khanduri, Shalini Gupta
INTRODUCTION: The emergence and spread of Multi-Drug Resistant (MDR) Non-Fermenting Gram-Negative Bacilli (NFGNB) in Intensive Care Units (ICU) and their genetic potential to transmit diverse antibiotic resistance regardless of their ability to ferment glucose poses a major threat in hospitals. The complex interplay of clonal spread, persistence, transmission of resistance elements and cell-cell interaction leads to the difficulty in controlling infections caused by these multi drug-resistant strains...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28272303/effects-of-silver-nanoparticles-on-multiple-drug-resistant-strains-of-staphylococcus-aureus-and-pseudomonas-aeruginosa-from-mastitis-infected-goats-an-alternative-approach-for-antimicrobial-therapy
#15
Yu-Guo Yuan, Qiu-Ling Peng, Sangiliyandi Gurunathan
Recently, silver nanoparticles (AgNPs) have been widely used in various applications as antimicrobial agents, anticancer, diagnostics, biomarkers, cell labels, and drug delivery systems for the treatment of various diseases. Microorganisms generally acquire resistance to antibiotics through the course of antibacterial therapy. Multi-drug resistance (MDR) has become a growing problem in the treatment of infectious diseases, and the widespread use of broad-spectrum antibiotics has resulted in the development of antibiotic resistance by numerous human and animal bacterial pathogens...
March 6, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28268024/presence-distribution-and-molecular-epidemiology-of-multi-drug-resistant-gram-negative-bacilli-from-medical-personnel-of-intensive-care-units-in-tianjin-china-2007-2015
#16
H Liu, C N Fei, Y Zhang, G W Liu, J Liu, J Dong
BACKGROUND: Multi-drug-resistant Gram-negative bacteria (MDRGNB) have become an important cause of nosocomial infection in intensive care units (ICUs). AIMS: To investigate the molecular epidemiology of MDRGNB isolated from medical personnel (MP) and non-medical personnel (NMP) at 69 ICUs in Tianjin, China. METHODS: From April 2007 to October 2015, 2636 nasal and hand swab samples from 1185 MP and 133 NMP were cultured for GNB (including MDRGNB), meticillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE)...
January 28, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28264490/plakofuranolactone-as-a-quorum-quenching-agent-from-the-indonesian-sponge-plakortis-cf-lita
#17
Valeria Costantino, Gerardo Della Sala, Kumar Saurav, Roberta Teta, Rinat Bar-Shalom, Alfonso Mangoni, Laura Steindler
There is an urgent need for novel strategies to fight drug resistance and multi-drug resistance. As an alternative to the classic antibiotic therapy, attenuation of the bacteria virulence affecting their Quorum sensing (QS) system is a promising approach. Quorum sensing (QS) is a genetic regulation system that allows bacteria to communicate with each other and coordinate group behaviors. A new γ-lactone that is capable of inhibiting the LasI/R QS system, plakofuranolactone (1), was discovered in the extract of the marine sponge Plakortis cf...
February 28, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28261736/dual-antibacterial-activities-of-a-chitosan-modified-upconversion-photodynamic-therapy-system-against-drug-resistant-bacteria-in-deep-tissue
#18
Siwen Li, Sisi Cui, Deyan Yin, Qiuyun Zhu, Yuxiang Ma, Zhiyu Qian, Yueqing Gu
Photodynamic therapy (PDT) has recently been proposed as an innovative approach to combat multi-drug resistant (MDR) bacteria. To improve the penetration depth of current PDT, a core-shell upconversion nanoparticle (UCNP) based PDT system, composed of a cationic N-octyl chitosan (OC) coated UCNP loaded with the photosensitizer zinc phthalocyanine (OC-UCNP-ZnPc), was constructed to enhance the antibacterial efficacy against MDR bacteria in deep tissue. The core-shell UCNPs displayed a higher upconversion fluorescence efficiency compared to the inner UCNP core...
March 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28251266/rapid-killing-of-bacteria-by-a-new-type-of-photosensitizer
#19
Yaxin Zhang, Ke Zheng, Zhuo Chen, Jincan Chen, Ping Hu, Linrong Cai, Zafar Iqbal, Mingdong Huang
Photodynamic antimicrobial chemotherapy (PACT) uses non-traditional mechanisms (free radicals) and is a highly advocated method with promise of inactivating drug-resistance bacteria for local infections. However, there is no related drug used in clinical practice yet. Therefore, new photosensitizers for PACT are under active development. Here, we report the synthesis of a series of photosensitizers with variable positive charges (ZnPc(TAP)4(n+), n = 0, 4, 8, 12) and their inactivation against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria...
March 1, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28249575/first-report-on-bla-ndm-1-producing-acinetobacter-baumannii-in-three-clinical-isolates-from-ethiopia
#20
Michael Pritsch, Ahmed Zeynudin, Maxim Messerer, Simon Baumer, Gabriele Liegl, Soeren Schubert, Thomas Löscher, Michael Hoelscher, Tefara Belachew, Andrea Rachow, Andreas Wieser
BACKGROUND: Multidrug-resistant Gram-negative bacterial infections are recognized as one of the major threats to global health. In this study, we describe for the first time bla NDM-1 gene carrying organisms from Ethiopia consisting of three Acinetobacter baumannii isolates from patients in Jimma. METHODS: Besides phenotypic antimicrobial susceptibility testing, molecular strain typing and sequencing was performed to describe the phylogenetic relation of the Ethiopian isolates in detail in relation to published isolates from all over the globe...
March 1, 2017: BMC Infectious Diseases
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