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https://www.readbyqxmd.com/read/28535606/isolation-purification-and-characterization-of-five-active-diketopiperazine-derivatives-from-endophytic-streptomyces-suk-25-with-antimicrobial-and-cytotoxic-activities
#1
Muhanna M Alshaibani, Juriyati Jalil, Nik M Sidik, Siti Junaidah Ahmad, Nurkhalida Kamal, Ruangelie Edrada-Ebel, Noraziah M Zin
On our search for new sources of bioactive secondary metabolites from Streptomyces sp., the ethyl acetate extracts from the endophytic Streptomyces SUK 25 afforded five active diketopiperazines compounds. The aim of this study was to characterize the bioactive compounds isolated from endophytic Streptomyces SUK 25 and evaluate its bioactivity against multiple drug resistance (MDR) bacteria such as Enterococcus raffinosus, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumanii, Pseudomonas aeruginosa and Enterobacter spp...
May 24, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28532398/clinical-outcomes-of-linezolid-and-vancomycin-in-patients-with-nosocomial-pneumonia-caused-by-methicillin-resistant-staphylococcus-aureus-stratified-by-baseline-renal-function-a-retrospective-cohort-analysis
#2
Ping Liu, Blair Capitano, Amy Stein, Ali A El-Solh
BACKGROUND: The primary objective of this study is to assess whether baseline renal function impacts treatment outcomes of linezolid and vancomycin (with a dose-optimized regimen) for methicillin-resistant Staphylococcus aureus (MRSA) pneumonia. METHODS: We conducted a retrospective cohort analysis of data generated from a prospective, randomized, controlled clinical trial (NCT 00084266). The analysis included 405 patients with culture-proven MRSA pneumonia. Baseline renal function was stratified based on creatinine clearance...
May 22, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28527358/improving-the-pharmacokinetics-and-tissue-distribution-of-pyrinezolid-by-self-assembled-polymeric-micelles
#3
Haiyue Long, Xiaoling Li, Zitai Sang, Lan Mei, Tao Yang, Zicheng Li, Liangxue Zhou, Yu Zheng, Gu He, Gang Guo, Zhenling Wang, Yong Deng, Youfu Luo
Antibiotic-resistance by bacteria is a growing global concern within the healthcare field, and it has provided an impetus for continued antimicrobial development. Pyrinezolid (PZ), a novel oxazolidinone compound, can effectively inhibit most gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant Enterococci (VRE). Though PZ is a promising antimicrobial candidate, the druggability of PZ is limited by its poor water solubility. Therefore, the amphipathic mPEG-PLLA copolymer was used to prepare the pyrinezolid micelles (PZ-M)...
May 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28515091/angiotensin-converting-enzyme-enhances-the-oxidative-response-and-bactericidal-activity-of-neutrophils
#4
Zakir Khan, Xiao Z Shen, Ellen A Bernstein, Jorge F Giani, Masahiro Eriguchi, Tuantuan V Zhao, Romer A Gonzalez-Villalobos, Sebastien Fuchs, George Y Liu, Kenneth E Bernstein
Angiotensin converting enzyme (ACE) inhibitors are widely used to reduce blood pressure. Here, we examined if ACE is important for the antibacterial effectiveness of neutrophils. ACE knockout mice or mice treated with an ACE inhibitor were more susceptible to bacterial infection by methicillin-resistant S. aureus (MRSA). In contrast, mice over expressing ACE in neutrophils (Neu(ACE) mice) have increased resistance to MRSA, and better in vitro killing of MRSA, P. aeruginosa, and K. pneumoniae ACE overexpression increased neutrophil production of reactive oxygen species (ROS) following MRSA challenge, an effect independent of the angiotensin II AT1 receptor...
May 17, 2017: Blood
https://www.readbyqxmd.com/read/28513576/biofilm-is-a-major-virulence-determinant-in-bacterial-colonization-of-chronic-skin-ulcers-independently-from-the-multidrug-resistant-phenotype
#5
Enea Gino Di Domenico, Ilaria Farulla, Grazia Prignano, Maria Teresa Gallo, Matteo Vespaziani, Ilaria Cavallo, Isabella Sperduti, Martina Pontone, Valentina Bordignon, Laura Cilli, Alessandra De Santis, Fabiola Di Salvo, Fulvia Pimpinelli, Ilaria Lesnoni La Parola, Luigi Toma, Fabrizio Ensoli
Bacterial biofilm is a major factor in delayed wound healing and high levels of biofilm production have been repeatedly described in multidrug resistant organisms (MDROs). Nevertheless, a quantitative correlation between biofilm production and the profile of antimicrobial drug resistance in delayed wound healing remains to be determined. Microbial identification, antibiotic susceptibility and biofilm production were assessed in 135 clinical isolates from 87 patients. Gram-negative bacteria were the most represented microorganisms (60...
May 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28513176/selective-inhibition-of-e-coli-rna-and-dna-topoisomerase-i-by-hoechst-33258-derived-mono-and-bisbenzimidazoles
#6
Nihar Ranjan, Sandra Story, Geraldine Fulcrand, Fenfei Leng, Muzammil Ahmad, Ada King, Souvik Sur, Weidong Wang, Yuk-Ching Tse-Dinh, Dev Priya Arya
A series of Hoechst 33258 based mono and bisbenzimidazoles have been synthesized and their E. coli DNA topoisomerase I inhibition, binding to B-DNA duplex and antibacterial activity has been evaluated. Bisbenzimidazoles with alkynyl side chains display excellent E. coli DNA topoisomerase I inhibition properties with IC50 values < 5.0 μM. Several bisbenzimidazoles (3, 6, 7, 8) also inhibit RNA topoisomerase activity of E. coli DNA topoisomerase I. Bisbenzimidazoles inhibit antibacterial growth much better than mono-benzimidazoles for gram positive strains...
May 17, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28511708/enzyme-mediated-formulation-of-stable-elliptical-silver-nanoparticles-tested-against-clinical-pathogens-and-mdr-bacteria-and-development-of-antimicrobial-surgical-thread
#7
Rupak Thapa, Chintan Bhagat, Pragya Shrestha, Suvash Awal, Pravin Dudhagara
BACKGROUND: Silver nanoparticles (AgNPs) are believed to be emerging tool against various infectious diseases including multi-drug resistant (MDR) bacteria. In the present study, in vitro synthesis of AgNPs was optimized using 1:50 ratio of macerozyme (25 μg/μl) and 1 mM AgNO3 incubated at 80 °C for 8 h. AgNPs were characterized by UV-Visible spectroscopy, dynamic light scattering (DLS), scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy (TEM) and X-ray diffraction (XRD)...
May 16, 2017: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/28510730/trimethoprim-sulfamethoxazole-versus-vancomycin-in-the-treatment-of-healthcare-ventilator-associated-mrsa-pneumonia-a-case-control-study
#8
Noa Eliakim-Raz, Moran Hellerman, Dafna Yahav, Jonathan Cohen, Ili Margalit, Sharon Fisher, Oren Zusman, Hila Shaked, Jihad Bishara
No abstract text is available yet for this article.
May 16, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28505374/comment-on-trimethoprim-sulfamethoxazole-versus-vancomycin-in-the-treatment-of-healthcare-ventilator-associated-mrsa-pneumonia-a-case-control-study
#9
Bryan P White, Ruben D Villanueva
No abstract text is available yet for this article.
May 15, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28500042/carboxyl-analogue-of-mutacin-1140-a-scaffold-for-lead-antibacterial-discovery
#10
Jerome Escano, Akshaya Ravichandran, Bita Salamat, Leif Smith
Mutacin 1140 belongs to the epidermin group of lantibiotics. Epidermin class lantibiotics are ribosomally synthesized and post translationally modified antibiotics with potent activity against Gram-positive bacteria. In particular, this class is effective at targeting drug resistant Streptococcus pneumoniae, MRSA,Mycobacterium tuberculosis, and Clostridium difficile A C-terminal S-[(Z)-2-aminovinyl]-D-cysteine (AviCys) residue is derived from a decarboxylation of a terminal cysteine that is involved in one of the lanthionine ring formation...
May 12, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28487208/epidemiology-and-outcome-of-invasive-fungal-infections-and-methicillin-resistant-staphylococcus-aureus-mrsa-pneumonia-and-complicated-skin-and-soft-tissue-infections-cssti-in-lebanon-and-saudi-arabia
#11
Rima Moghnieh, Adel F Alothman, Abdulhakeem O Althaqafi, Madonna J Matar, Thamer H Alenazi, Fayassal Farahat, Shelby L Corman, Caitlyn T Solem, Nirvana Raghubir, Cynthia Macahilig, Jennifer M Stephens
The objectives of this retrospective medical chart review study were to document the inpatient incidence, treatment, and clinical outcomes associated with invasive fungal infections (IFI) due to Candida and Aspergillus species, Methicillin-resistant Staphylococcus aureus (MRSA) pneumonia and MRSA complicated skin and soft tissue infections (cSSTI) in the Middle East. This study evaluated 2011-2012 data from 5 hospitals in Saudi Arabia and Lebanon with a combined total of 207,498 discharges. Hospital medical chart data were abstracted for a random sample of patients with each infection type (102 patients - IFI, 93 patients - MRSA pneumonia, and 87 patients-MRSA cSSTI)...
May 6, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28485324/a-novel-porcine-model-of-septic-shock-induced-by-acute-respiratory-distress-syndrome-due-to-methicillin-resistant-staphylococcus-aureus
#12
Shuo Wang, Jun-Yu Wang, Tao Wang, Chen-Chen Hang, Rui Shao, Chun-Sheng Li
BACKGROUND: Sepsis is one of the main causes of mortality in critically ill patients following progression to septic shock. To investigate the pathophysiologic changes of sepsis, we developed a novel porcine model of septic shock induced by acute respiratory distress syndrome (ARDS) due to methicillin-resistant Staphylococcus aureus(MRSA) pneumonia. METHODS: Twenty-six male Landraces (Lvyuanweiye, Beijing, China) weighing 30 ± 2 kg were divided into four groups: sham group (SH; n = 5); cotton smoke inhalation group (SM; n = 6); MRSA pneumonia group (MR; n = 6); and septic shock group with cotton smoke inhalation + MRSA pneumonia (SS; n = 9)...
May 20, 2017: Chinese Medical Journal
https://www.readbyqxmd.com/read/28483959/gepotidacin-gsk2140944-in-vitro-activity-against-gram-positive-and-gram-negative-bacteria-mbc-mic-kill-kinetics-checkerboard-pae-sme-tests
#13
R K Flamm, D J Farrell, P R Rhomberg, N E Scangarella-Oman, H S Sader
Gepotidacin is a first in class, novel triazaacenaphthylene antibiotic that inhibits bacterial DNA replication and has in vitro activity against susceptible and drug-resistant pathogens. Reference in vitro methods were used to investigate the minimum inhibitory (MIC) and minimum bactericidal concentration (MBC) activity of gepotidacin and comparator agents against Staphylococcus aureusStreptococcus pneumoniae and Escherichia coli. Gepotidacin in vitro activity was also evaluated using time-kill kinetics, broth microdilution checkerboard methods for synergy testing, and for postantibiotic and subinhibitory effects...
May 8, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28483717/surveillance-of-the-activity-of-solithromycin-cem-101-against-bacteria-from-respiratory-tract-infections
#14
Stephen Hawser, Ian Morrissey, Barbara Lemos, Kara Keedy, Prabhavathi Fernandes
The activity of solithromycin, a fourth-generation macrolide and novel fluoroketolide, was evaluated by determining its minimum inhibitory concentration (MIC) (via Clinical and Laboratory Standards Institute broth microdilution) against 2797 contemporary clinical respiratory tract isolates collected from North America, Europe, Asia-Pacific and other regions of the world in 2012-13. Solithromycin was very active against Streptococcus pneumoniae and Streptococcus pyogenes, with MIC90 of 0.25 and 0.12 µg/mL, respectively...
May 5, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28479017/reduced-nosocomial-infection-rate-in-a-neonatal-intensive-care-unit-during-a-4-year-surveillance-period
#15
Yong-Chuan Chen, Chen-Fu Lin, Yun-Jiau Fuh Rehn, Juei-Chao Chen, Po-Yen Chen, Chao-Huei Chen, Teh-Ming Wang, Fang-Liang Huang
BACKGROUND: Hospital-acquired infections are a leading cause of morbidity and mortality in neonatal intensive care units (NICU). The aim of the study was to investigate the change of nosocomial infection rate in a NICU during a 4-year surveillance period. METHODS: We investigated the changes in nosocomial infection rates, infection sites, and microorganism species in a NICU before and after the unit was moved to a new location, extending from November 2008 to October 2012...
May 3, 2017: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/28473609/progression-and-variability-of-physiologic-deterioration-in-an-ovine-model-of-lung-infection-sepsis
#16
Farid Yaghouby, Chathuri Daluwatte, Satoshi Fukuda, Christina Nelson, John Salsbury, Michael P Kinsky, George C Kramer, David G Strauss, Perenlei Enkhbaatar, Christopher G Scully
In this study, a lung infection model of pneumonia in sheep (N=12) that included smoke inhalation injury followed by Methicillin-resistant Staphylococcus aureus (MRSA) placement into the lungs was used to investigate hemodynamic and pulmonary dysfunctions during the course of sepsis progression. To assess the variability in disease progression, animals were retrospectively divided into survivor (N=6) and non-survivor (N=6) groups and a range of physiological indices reflecting hemodynamic and pulmonary function were estimated and compared to evaluate variability in dynamics underlying sepsis development...
May 4, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28465626/synthesis-and-biological-evaluation-of-indole-core-based-derivatives-with-potent-antibacterial-activity-against-resistant-bacterial-pathogens
#17
Wei Hong, Jingyang Li, Zhe Chang, Xiaoli Tan, Hao Yang, Yifan Ouyang, Yanhui Yang, Sargit Kaur, Ian C Paterson, Yun Fong Ngeow, Hao Wang
The emergence of drug resistance in bacterial pathogens is a growing clinical problem that poses difficult challenges in patient management. To exacerbate this problem, there is currently a serious lack of antibacterial agents that are designed to target extremely drug-resistant bacterial strains. Here we describe the design, synthesis and antibacterial testing of a series of 40 novel indole core derivatives, which are predicated by molecular modeling to be potential glycosyltransferase inhibitors. Twenty of these derivatives were found to show in vitro inhibition of Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus...
May 3, 2017: Journal of Antibiotics
https://www.readbyqxmd.com/read/28450195/evaluation-of-the-eazyplex-mrsa-assay-for-the-rapid-detection-of-staphylococcus-aureus-in-pleural-and-synovial-fluid
#18
D Henares, P Brotons, X Buyse, I Latorre, H D de Paz, C Muñoz-Almagro
OBJECTIVE: Loop-mediated isothermal amplification (LAMP) is a simple and sensitive technique for rapid microbiological diagnosis. The aim of this study was to evaluate the analytical and diagnostic performance of the LAMP eazyplex MRSA test for the direct detection and differentiation of methicillin-susceptible (MSSA) and methicillin-resistant Staphylococcus aureus (MRSA) in synovial/pleural fluid. METHODS: Analytical validation included the determination of the limit of detection (LoD) and analytical specificity of the eazyplex MRSA test...
April 24, 2017: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/28448954/copper-complexes-containing-thiosemicarbazones-derived-from-6-nitropiperonal-antimicrobial-and-biophysical-properties
#19
Floyd A Beckford, Kelsey R Webb
A series of four thiosemicarbazones from 6-nitropiperonal along with the corresponding copper complexes were synthesized. The biophysical characteristics of the complexes were investigated by the binding to DNA and human serum albumin. The binding to DNA is moderate; the binding constants run from (0.49-7.50)×10(4)M(-1). In relation to HSA, the complexes interact strongly with binding constants on the order of 10(5)M(-1). The complexes also display antioxidant behavior as determined by the ability to scavenge diphenylpicrylhydrazyl (dpph) and nitric oxide radicals...
April 20, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28442909/tat-functionalized-liposomes-for-the-treatment-of-meningitis-an-in-vitro-study
#20
Caterina Bartomeu Garcia, Di Shi, Thomas J Webster
Bacterial meningitis has become a global concern, because of the emergence of antibiotic-resistant bacteria. It has been demonstrated that liposomes can enter bacteria, thus providing a possible treatment for numerous infections, including meningitis. Fusogenic liposomes are pH-sensitive with a high capacity to fuse with the bacteria membrane and promote intracellular drug release. Moreover, this ability can be improved by using cell-penetrating peptides (such as Tat47-57, which is a peptide derived from the Tat protein of HIV)...
2017: International Journal of Nanomedicine
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