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https://www.readbyqxmd.com/read/29785848/the-total-synthesis-of-tetarimycin-a-%C3%A2-naphthacemycin-a-9-and-%C3%A2-fasamycin-a-structure-activity-relationship-studies-against-drug-resistant-bacteria
#1
Jing-Kai Huang, Tsai-Ling Yang Lauderdale, Chun-Cheng Lin, Kak-Shan Shia
Making use of a reductive olefin coupling reaction and Michael-Dieckmann condensation as two key operations, we have completed a concise total synthesis of tetarimycin A, (±)-naphthacemycin A9 and (±)-fasamycin A in a highly convergent and practical protocol. Synthetic procedures thus developed have also been applied to providing related analogues for structure-activity relationship studies, thereof coming to a conclusion that the free hydroxyl group at C-10 is essential for exerting inhibitory activities against a panel of Gram-positive bacteria, including drug-resistant strains VRE and MRSA...
May 22, 2018: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29784838/in-vivo-and-in-vitro-effects-of-a-clpp-activating-antibiotic-against-vancomycin-resistant-enterococci
#2
Autumn Brown Gandt, Elizabeth C Griffith, Ida M Lister, Lisa L Billings, Angel Han, Rajendra Tangallapally, Ying Zhao, Aman P Singh, Richard E Lee, Michael D LaFleur
Antibiotics with novel bactericidal mechanisms of action are urgently needed. The antibiotic acyldepsipeptide 4 (ADEP4) activates the ClpP protease and causes cells to self-digest. The effects of ADEP4 and ClpP activation have not been sufficiently characterized for the enterococci, which are important pathogens known for high levels of acquired and intrinsic antibiotic resistance. In the present study, ADEP4 was found to be potently active against both Enterococcus faecalis and Enterococcus faecium with an MIC90 of 0...
May 21, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29784578/quantitative-study-about-the-role-of-environmental-conditions-in-the-survival-capability-of-multidrug-resistant-bacteria
#3
Adrienn Hanczvikkel, Ákos Tóth
BACKGROUND: Healthcare-associated infections (HAIs) caused by multidrug-resistant bacteria (MDRB) are of global concern and hospital textiles can contribute to their transmission. MDRB are able to survive on textiles for more than enough time to spread in the environment. Some studies summarized the effect of environmental factors on the duration of bacterial survival, but it remained an open question how these factors influence the quantity of surviving bacteria in a period of a few days, which is relevant from the perspective of HAIs...
May 18, 2018: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29783077/effects-of-prolonged-exposure-and-virtual-reality-exposure-on-suicidal-ideation-in-active-duty-soldiers-an-examination-of-potential-mechanisms
#4
REVIEW
Aaron M Norr, Derek J Smolenski, Greg M Reger
OBJECTIVE: The current study sought to investigate the effects of exposure therapy on suicidal ideation (SI), as well as potential mechanistic pathways of SI reduction among active duty military personnel. METHODS: Active duty army soldiers (N = 162) were recruited from a military base in the U.S. and were enrolled in a randomized clinical trial comparing Prolonged Exposure (PE), Virtual Reality Exposure (VRE), and a wait-list control for the treatment of posttraumatic stress disorder (PTSD) stemming from deployments to Iraq or Afghanistan...
May 12, 2018: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/29778894/new-n-phenylpyrrolamide-dna-gyrase-b-inhibitors-optimization-of-efficacy-and-antibacterial-activity
#5
Martina Durcik, Denise Lovison, Žiga Skok, Cristina Durante Cruz, Päivi Tammela, Tihomir Tomašič, Davide Benedetto Tiz, Gábor Draskovits, Ákos Nyerges, Csaba Pál, Janez Ilaš, Lucija Peterlin Mašič, Danijel Kikelj, Nace Zidar
The ATP binding site located on the subunit B of DNA gyrase is an attractive target for the development of new antibacterial agents. In recent decades, several small-molecule inhibitor classes have been discovered but none has so far reached the market. We present here the discovery of a promising new series of N-phenylpyrrolamides with low nanomolar IC50 values against DNA gyrase, and submicromolar IC50 values against topoisomerase IV from Escherichia coli and Staphylococcus aureus. The most potent compound in the series has an IC50 value of 13 nM against E...
May 10, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29777835/combined-bacteriophages-and-antibiotics-as-an-efficient-therapy-against-vre-enterococcus-faecalis-in-a-mouse-model
#6
Daniel Gelman, Shaul Beyth, Vanda Lerrer, Karen Adler, Ronit Poradosu-Cohen, Shunit Coppenhagen-Glazer, Ronen Hazan
Clinical applications of bacteriophage therapy have been recently gathering significant attention worldwide, used mostly as rescue therapy in cases of near-fatal antibiotic failure. Thus, clinically relevant in-vivo models presenting both short- and long-term implications of phage therapy given as rescue treatment for fulminant infections are of highest importance. In this study, a cocktail consisting of two lytic bacteriophages was used to evaluate the therapeutic efficacy of phage therapy as a rescue treatment for severe septic peritonitis in a mouse model...
May 16, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/29773506/in-vitro-activity-of-salicylamide-derivatives-against-vancomycin-resistant-enterococci
#7
Sarka Pospisilova, Hana Michnova, Tereza Kauerova, Karel Pauk, Peter Kollar, Jarmila Vinsova, Ales Imramovsky, Alois Cizek, Josef Jampilek
A series of 13 salicylamide derivatives was assessed for antibacterial activity against three isolates of vancomycin-resistant Enterococcus faecalis (VRE) and Enterococcus faecalis ATCC 29212 as a quality standard. The minimum inhibitory concentration was determined by the broth microdilution method with subsequent subcultivation of aliquots to assess minimum bactericidal concentration. The growth kinetics was established by the time-kill assay. Ampicillin, ciprofloxacin, tetracycline and vancomycin were used as the reference antibacterial drugs...
May 14, 2018: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/29760912/continuous-increase-of-vancomycin-resistance-in-enterococci-causing-nosocomial-infections-in-germany-10-years-of-surveillance
#8
Cornelius Remschmidt, Christin Schröder, Michael Behnke, Petra Gastmeier, Christine Geffers, Tobias Siegfried Kramer
Background: Enterococci are frequent pathogens causing nosocomial infections in Germany. Infections due to strains with vancomycin resistance are high when compared with other European states. Therefore, the study aimed to describe the recent progression of nosocomial infections due to vancomycin-resistant enterococci (VRE) in Germany. Methods: We analyzed data from two components of the German national nosocomial infection surveillance system for the period 2007-2016...
2018: Antimicrobial Resistance and Infection Control
https://www.readbyqxmd.com/read/29746941/10-year-trends-in-vancomycin-resistant-enterococci-among-allogeneic-hematopoietic-cell-transplant-recipients
#9
Trenton J MacAllister, Erica Stohs, Catherine Liu, Andrew Bryan, Estella Whimbley, Amanda Phipps, Steven A Pergam
OBJECTIVES: We examined VRE colonization, bacteremia (VREB) incidence and outcomes within 100 days of allogeneic hematopoietic cell transplantation (HCT). METHODS: HCT recipients screened for VRE were assessed, and colonization and VREB incidence compared over time using linear regression. Cox proportional hazards models were constructed to assess the relationship between mortality, pre-HCT colonization, and underlying disease. RESULTS: Of 1,492 HCT recipients, 204 (14%) patients were colonized pre-HCT, while 90 (6%) acquired colonization post-HCT...
May 7, 2018: Journal of Infection
https://www.readbyqxmd.com/read/29746380/one-year-incidence-of-infection-in-pediatric-intestine-transplantation
#10
Jared W Clouse, Chandrashekhar A Kubal, Jonathan A Fridell, Richard S Mangus
BACKGROUND: This study reports the infection rate, location of infection, and pathogen causing bacterial, fungal, or viral infections in intestine transplant recipients at a pediatric transplant center. METHODS: Records from a pediatric center were reviewed for patients receiving an intestine transplant. Positive cultures and pathology reports were used to diagnose bacterial, fungal, and viral infections and also to determine location and infectious agent. Risk for infection was assessed based on liver or colon inclusion, and immunosuppression induction, as part of the intestine transplant...
May 9, 2018: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29745356/noninfectious-hospital-adverse-events-decline-after-elimination-of-contact-precautions-for-mrsa-and-vre
#11
Elise M Martin, Brandy Bryant, Tristan R Grogan, Zachary A Rubin, Dana L Russell, David Elashoff, Daniel Z Uslan
OBJECTIVETo evaluate the impact of discontinuing routine contact precautions (CP) for endemic methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) on hospital adverse events.DESIGNRetrospective, nonrandomized, observational, quasi-experimental study.SETTINGAcademic medical center with single-occupancy rooms.PARTICIPANTSInpatients.METHODSWe compared hospital reportable adverse events 1 year before and 1 year after discontinuation of routine CP for endemic MRSA and VRE (preintervention and postintervention periods, respectively)...
May 10, 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29734488/virtual-reality-exposure-versus-prolonged-exposure-for-ptsd-which-treatment-for-whom
#12
Aaron M Norr, Derek J Smolenski, Andrea C Katz, Albert A Rizzo, Barbara O Rothbaum, JoAnn Difede, Patricia Koenen-Woods, Mark A Reger, Greg M Reger
BACKGROUND: The majority of studies comparing active psychological treatments for posttraumatic stress disorder (PTSD) do not find significant differences at posttreatment. This was the case in a recent trial examining prolonged exposure (PE) and virtual reality exposure (VRE) among active-duty soldiers with combat-related PTSD. Matching individual patients to specific treatments provides a potential avenue to improve significantly the public health impact of effective treatments for PTSD...
May 7, 2018: Depression and Anxiety
https://www.readbyqxmd.com/read/29726892/environmental-panels-as-a-proxy-for-nursing-facility-patients-with-methicillin-resistant-staphylococcus-aure-and-vancomycin-resistant-enterococcus-colonization
#13
Marco Cassone, Julia Mantey, Mary Beth Perri, Kristen Gibson, Bonnie Lansing, Sara McNamara, Payal K Patel, Vincent C C Cheng, Maroya S Walters, Nimalie D Stone, Marcus J Zervos, Lona Mody
Background: Most nursing facilities (NFs) lack methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococcus (VRE) surveillance programs due to limited resources and high costs. We investigated the utility of environmental screening of high-touch surfaces in patient rooms as a way to circumvent these challenges. Methods: We compared MRSA and VRE culture data from high-touch surfaces in patients' rooms (14450 samples from 6 NFs) and ranked each site's performance in predicting patient colonization (7413 samples)...
May 2, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/29722581/antibacterial-activity-of-3-methylbenzo-d-thiazol-methylquinolinium-derivatives-and-study-of-their-action-mechanism
#14
Ning Sun, Ruo-Lan Du, Yuan-Yuan Zheng, Qi Guo, Sen-Yuan Cai, Zhi-Hua Liu, Zhi-Yuan Fang, Wen-Chang Yuan, Ting Liu, Xiao-Mei Li, Yu-Jing Lu, Kwok-Yin Wong
The increasing incidence of multidrug resistant bacterial infection renders an urgent need for the development of new antibiotics. To develop small molecules disturbing FtsZ activity has been recognized as promising approach to search for antibacterial of high potency systematically. Herein, a series of novel quinolinium derivatives were synthesized and their antibacterial activities were investigated. The compounds show strong antibacterial activities against different bacteria strains including MRSA, VRE and NDM-1 Escherichia coli...
December 2018: Journal of Enzyme Inhibition and Medicinal Chemistry
https://www.readbyqxmd.com/read/29718329/antimicrobial-susceptibility-and-ribotypes-of-clostridium-difficile-isolates-from-a-phase-2-clinical-trial-of-ridinilazole-smt19969-and-vancomycin
#15
David R Snydman, Laura A McDermott, Cheleste M Thorpe, Justin Chang, Jenna Wick, Seth T Walk, Richard J Vickers
Objectives: We evaluated the antimicrobial susceptibility and ribotypes of Clostridium difficile isolates from participants in a Phase 2 study of ridinilazole, a novel targeted-spectrum agent for treatment of C. difficile infection. Methods: Participants received ridinilazole (200 mg twice daily) or vancomycin (125 mg four times daily) for 10 days (ClinicalTrials.gov: NCT02092935). The MICs of ridinilazole and comparators for C. difficile isolates from stool samples were determined by agar dilution...
April 30, 2018: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29708837/molecular-epidemiology-of-vancomycin-resistant-enterococcus-faecalis-and-enterococcus-faecium-isolated-from-clinical-specimens-in-the-northwest-of-iran
#16
Ali Jahansepas, Mohammad Ahangarzadeh Rezaee, Alka Hasani, Yaeghob Sharifi, Marjan Rahnamaye Farzami, Alireza Dolatyar, Mohammad Aghazadeh
This study was conducted to investigate the phenotypic and genotypic characteristics of vancomycin-resistant Enterococcus faecalis and Enterococcus faecium. Antibiotic resistance and virulence genes in the aforementioned resistant isolates were studied using the epsilometer (E)-test and polymerase chain reaction (PCR). These isolates were subjected to typing by pulsed-field gel electrophoresis (PFGE). Thirty vancomycin-resistant enterococci (VRE; 18.75%) were isolated from a total of 160 various clinical specimens cultured for any bacterial growth...
April 30, 2018: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
https://www.readbyqxmd.com/read/29705860/bloodstream-infections-in-haematological-cancer-patients-colonized-by-multidrug-resistant-bacteria
#17
C Cattaneo, R Di Blasi, C Skert, A Candoni, B Martino, N Di Renzo, M Delia, S Ballanti, F Marchesi, V Mancini, E Orciuolo, S Cesaro, L Prezioso, R Fanci, G Nadali, A Chierichini, L Facchini, M Picardi, M Malagola, V Orlando, E M Trecarichi, M Tumbarello, F Aversa, G Rossi, L Pagano
Infections by multidrug-resistant (MDR) bacteria are a worrisome phenomenon in hematological patients. Data on the incidence of MDR colonization and related bloodstream infections (BSIs) in haematological patients are scarce. A multicentric prospective observational study was planned in 18 haematological institutions during a 6-month period. All patients showing MDR rectal colonization as well as occurrence of BSI at admission were recorded. One-hundred forty-four patients with MDR colonization were observed (6...
April 28, 2018: Annals of Hematology
https://www.readbyqxmd.com/read/29701222/progressive-cationic-functionalization-of-chlorin-derivatives-for-antimicrobial-photodynamic-inactivation-and-related-vancomycin-conjugates
#18
Liyi Huang, Min Wang, Ying-Ying Huang, Ahmed El-Hussein, Lawrence M Wolf, Long Y Chiang, Michael R Hamblin
It is known that multiple cationic charges are required to produce broad-spectrum antimicrobial photosensitizers (PS) for photodynamic inactivation (aPDI) or photodynamic therapy of bacteria and fungi. In the present study we describe the synthesis and aPDI testing of a set of derivatives prepared from the parent pheophytin molecule with different numbers of attached side arms (1-3) each consisting of five quaternized cationic groups (pentacationic), producing the corresponding [Zn2+]pheophorbide-a-N(C2N+C1C3)5 (Zn-Phe-N5+, 5 charges), [Zn2+]chlorin e6-[N(C2N+C1C3)5]2 (Zn-Chl-N10+, 10 charges) and [Zn2+]mesochlorin e6-[N(C2N+C1C3)5]3 (Zn-mChl-N15+, 15 charges)...
April 27, 2018: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/29700554/platelet-rich-plasma-as-an-additional-therapeutic-option-for-infected-wounds-with-multi-drug-resistant-bacteria-in-vitro-antibacterial-activity-study
#19
Rıza Aytaç Çetinkaya, Ercan Yenilmez, Patrizio Petrone, Soner Yılmaz, Bayhan Bektöre, Berksan Şimsek, Tuğba Kula Atik, Mustafa Özyurt, Aytekin Ünlü
PURPOSE: Infected wounds, such as diabetic foot infections, are mostly polymicrobial and microorganisms have high resistance rates to antimicrobials. Infected wounds in diabetic patients have high cost, morbidity, and mortality rates. Based on these facts, there is a need for supportive localized treatment options such as platelet-rich plasma (PRP) implementations. Demonstrating the in vitro antimicrobial effect, our aim was to lead up to clinical trials of localized PRP implementations in infected wounds such as diabetic foot infections...
April 26, 2018: European Journal of Trauma and Emergency Surgery: Official Publication of the European Trauma Society
https://www.readbyqxmd.com/read/29690991/-treatment-of-vancomycin-resistant-enterococcal-infections
#20
Lars Christian Lund, Barbara Juliane Holzknecht, Ulrik Stenz Justesen
Vancomycin-resistant enterococci (VRE) are a growing healthcare concern, and since 2012 the incidence has increased eightfold in Denmark. Treatment options for infections with ampicillin-resistant VRE are sparse, and there are no Danish guidelines concerning this topic. For treatment of uncomplicated VRE urinary tract infections, ciprofloxacin or nitrofurantoin can be used. The mainstay of treatment of bacteraemia and other severe infections caused by VRE is linezolid or high-dose daptomycin. Combination treatment is recommended for complicated infections and/or prolonged therapy...
April 16, 2018: Ugeskrift for Laeger
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