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Antibacterial agents

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https://www.readbyqxmd.com/read/28448028/system-for-efficacy-and-cytotoxicity-screening-of-inhibitors-targeting-intracellular-mycobacterium-tuberculosis
#1
Xingji Zheng, Yossef Av-Gay
Mycobacterium tuberculosis, the causative agent of tuberculosis (TB), is a leading cause of morbidity and mortality worldwide. With the increased spread of multi drug-resistant TB (MDR-TB), there is a real urgency to develop new therapeutic strategies against M. tuberculosis infections. Traditionally, compounds are evaluated based on their antibacterial activity under in vitro growth conditions in broth; however, results are often misleading for intracellular pathogens like M. tuberculosis since in-broth phenotypic screening conditions are significantly different from the actual disease conditions within the human body...
April 5, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28443385/pseudomonas-aeruginosa-prevalence-antibiotic-resistance-and-antimicrobial-use-in-chinese-burn-wards-from-2007-to-2014
#2
Yi Dou, Jingning Huan, Feng Guo, Zengding Zhou, Yan Shi
Objective To assess the application of antibacterial agents, alongside pathogen prevalence and Pseudomonas aeruginosa drug resistance, with the aim of understanding the impact of inappropriate antibacterial use. Methods This retrospective study assessed bacteria from wounds, catheters, blood, faeces, urine and sputum of hospitalized patients in burn wards between 2007 and 2014. The intensity of use of antibacterial agents and resistance of P. aeruginosa to common anti-Gram-negative antibiotics were measured...
January 1, 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28443279/analogs-of-the-frog-skin-antimicrobial-peptide-temporin-1tb-exhibit-a-wider-spectrum-of-activity-and-a-stronger-antibiofilm-potential-as-compared-to-the-parental-peptide
#3
Lucia Grassi, Giuseppantonio Maisetta, Giuseppe Maccari, Semih Esin, Giovanna Batoni
The frog skin-derived peptide Temporin 1Tb (TB) has gained increasing attention as novel antimicrobial agent for the treatment of antibiotic-resistant and/or biofilm-mediated infections. Nevertheless, such a peptide possesses a preferential spectrum of action against Gram-positive bacteria. In order to improve the therapeutic potential of TB, the present study evaluated the antibacterial and antibiofilm activities of two TB analogs against medically relevant bacterial species. Of the two analogs, TB_KKG6A has been previously described in the literature, while TB_L1FK is a new analog designed by us through statistical-based computational strategies...
2017: Frontiers in Chemistry
https://www.readbyqxmd.com/read/28442908/antibacterial-activity-and-cytocompatibility-of-an-implant-coating-consisting-of-tio2-nanotubes-combined-with-a-gl13k-antimicrobial-peptide
#4
Tao Li, Na Wang, Su Chen, Ran Lu, Hongyi Li, Zhenting Zhang
Prevention of implant-associated infections at an early stage of surgery is highly desirable for the long-term efficacy of implants in dentistry and orthopedics. Infection prophylaxis using conventional antibiotics is becoming less effective due to the development of bacteria resistant to multiple antibiotics. An ideal strategy to conquer bacterial infections is the local delivery of antibacterial agents. Therefore, antimicrobial peptide (AMP) eluting coatings on implant surfaces is a promising alternative...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28442427/neglected-antibacterial-activity-of-ethylene-glycol-as-a-common-solvent
#5
M Moghayedi, H Ahmadzadeh, K Ghazvini, E K Goharshadi
For the first time, the antibacterial activity of ethylene glycol (EG), a routine frequently used solvent against Escherichia coli (E. coli) bacterium, was assessed. The antibacterial activity of EG against E. coli was measured using colony counting and broth turbidity assays. The influence of EG concentration (1.5-25.0%v/v) and exposure time on the growth of E. coli was investigated. By increasing EG concentration, its antibacterial activity against E. coli increased so that for both 24.0% and 25.0% of EG, the bacteria growth was totally inhibited within 4 h...
April 22, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28441741/peptides-peptidomimetics-and-polypeptides-from-marine-sources-a-wealth-of-natural-sources-for-pharmaceutical-applications
#6
Rushikesh Sable, Pravin Parajuli, Seetharama Jois
Nature provides a variety of peptides that are expressed in most living species. Evolutionary pressure and natural selection have created and optimized these peptides to bind to receptors with high affinity. Hence, natural resources provide an abundant chemical space to be explored in peptide-based drug discovery. Marine peptides can be extracted by simple solvent extraction techniques. The advancement of analytical techniques has made it possible to obtain pure peptides from natural resources. Extracted peptides have been evaluated as possible therapeutic agents for a wide range of diseases, including antibacterial, antifungal, antidiabetic and anticancer activity as well as cardiovascular and neurotoxin activity...
April 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28441350/synthesis-and-bioactivity-evaluation-of-novel-2-salicyloylbenzofurans-as-antibacterial-agents
#7
Phuong-Thuy T Phan, Thu-Trang T Nguyen, Hong-Nhung T Nguyen, Bao-Khanh N Le, Thao T Vu, Dong C Tran, Tuan-Anh N Pham
In order to discover new antibacterial agents, series of 2-salicyloylbenzofuran derivatives were designed, synthesized and evaluated for their antibacterial activities against three Gram-(+) strains (methicillin-sensitive Staphylococcus aureus (MSSA) ATCC 29213, methicillin-resistant Staphylococcus aureus (MRSA) ATCC 43300, and Streptococcus faecalis (S. faecalis) ATCC 29212) and one Gram-(-) strain (Escherichia coli (E. coli) ATCC 25922). The 2-salicyloylbenzofuran heterocycles were generated by Rap-Stoermer condensation of salicylaldehydes with phenacyl bromides and then converted to diverse O-ether derivatives by Williamson synthesis...
April 25, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28440203/antimicrobial-biofilm-inhibitory-and-anti-infective-activity-of-metallic-nanoparticles-against-multi-drug-resistant-mrsa-and-pseudomonas-aeruginosa-pa01
#8
Jamuna Bai Ashwathanarayan, Ravishankar Rai Vittal
BACKGROUND: The emergence of drug resistant pathogens is a major concern to the scientific community. Novel approaches such as the use of functionalized nanomaterials with antimicrobial activity is required to treat infectious diseases. OBJECTIVE: In the present study, the metallic nanoparticles (iron, gold, zinc oxide and copper oxide) were evaluated for the antimicrobial, biofilm inhibitory and anti-infective activity against human pathogens methicillin resistant Staphylococcus aureus and Pseudomonas aeruginosa PA01...
April 24, 2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28438936/demonstrating-the-protective-efficacy-of-the-novel-fluoroquinolone-finafloxacin-against-an-inhalational-exposure-to-burkholderia-pseudomallei
#9
Kay B Barnes, Karleigh A Hamblin, Mark I Richards, Thomas R Laws, Andreas Vente, Helen S Atkins, Sarah V Harding
Burkholderia pseudomallei is the causative agent of melioidosis, a serious disease endemic in South East Asia and Northern Australia. Antibiotic treatment is lengthy and relapse often occurs. Finafloxacin is a novel fluoroquinolone with increased antibacterial activity in acidic conditions in contrast to other fluoroquinolones which demonstrate reduced activity at lower pH. Therefore finafloxacin may have improved efficacy against B. pseudomallei, which can survive within host cells where the local pH is acidic...
April 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28437746/catalytic-reduction-of-4-nitrophenol-and-photo-inhibition-of-pseudomonas-aeruginosa-using-gold-nanoparticles-as-photocatalyst
#10
Shafiullah Khan, Wang Runguo, Kamran Tahir, Zhang Jichuan, Liqun Zhang
A simple, green method is described for the synthesis of Gold (Au) nanoparticles (NPs) using Cotoneaster horizontalis extract as a phyto-reducer and capping agent with superior photo inhibition activity against Pseudomonas aeruginosa. Different from the other methods used elevated temperatures for nanoparticles synthesis, the novelty of our method lies in its energy saving process and fast synthesis rates (~5min for AuNPs), and its potential to tune the nanoparticles size and afterward their catalytic activity...
April 13, 2017: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/28436320/antibacterial-activity-of-desert-truffles-from-saudi-arabia-against-staphylococcus-aureus-and-pseudomonas-aeruginosa
#11
Domenico Schillaci, Maria Grazia Cusimano, Stella Maria Cascioferro, Vita Di Stefano, Vincenzo Arizza, Marco Chiaramonte, Luigi Inguglia, Abdulhakim Bawadekji, Salvatore Davino, Maria Letizia Gargano, Giuseppe Venturella
Medicinal mushrooms represent an unlimited source of polysaccharides with nutritional, antitumoral, antibacterial, and immune-stimulating properties. Traditional studies of epigeous higher Basidiomycetes have recently been joined by studies of hypogeous fungi and, in particular, of so-called desert truffles. With the aim to obtain novel agents against bacteria of clinical importance, we focused on the edible desert truffle mushrooms Tirmania pinoyi, Terfezia claveryi, and Picoa juniperi as sources of new antimicrobial agents...
2017: International Journal of Medicinal Mushrooms
https://www.readbyqxmd.com/read/28435943/influence-of-charged-defects-on-the-interfacial-bonding-strength-of-tantalum-and-silver-doped-nanograined-tio2
#12
Jalal Azadmanjiri, James Wang, Christopher C Berndt, Ajay Kapoor, De Ming Zhu, Andrew S M Ang, Vijay K Srivastava
A nano-grained layer including line defects was formed on the surface of a Ti alloy (Tialloy, Ti-6Al-4V ELI). Then, the micro- and nano-grained Tialloy with the formation of TiO2 on its top surface was coated with a bioactive Ta layer with or without incorporating an antibacterial agent of Ag that was manufactured by magnetron sputtering. Subsequently, the influence of the charged defects (the defects that can be electrically charged on the surface) on the interfacial bonding strength and hardness of the surface system was studied via an electronic model...
April 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28435429/antibacterial-and-cytotoxic-activities-of-naphthoquinone-pigments-from-onosma-visianii-clem
#13
Milena D Vukic, Nenad L Vukovic, Gorica T Djelic, Suzana Lj Popovic, Milan M Zaric, Dejan D Baskic, Gordana B Krstic, Vele V Tesevic, Miroslava M Kacaniova
In this study, the antibacterial and cytotoxic activities of isolated compounds from the roots of Onosma visianii were investigated. By using different chromatographic techniques and appropriate spectroscopic methods, the seven naphthoquinones were described: deoxyshikonin ( 1 ), isobutyrylshikonin ( 2 ), α-methylbutyrylshikonin ( 3 ), acetylshikonin ( 4 ), β-hydroxyisovalerylshikonin ( 5 ), 5,8-O-dimethyl isobutyrylshikonin ( 6 ) and 5,8-O-dimethyl deoxyshikonin ( 7 ). Among the tested compounds, 3 and 4 exhibited the highest antibacterial activities toward all tested bacterial species (MIC50 and MIC90 for gram positive bacteria: 6...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28434876/dual-targeting-small-molecule-inhibitors-of-the-staphylococcus-aureus-fmn-riboswitch-disrupt-riboflavin-homeostasis-in-an-infectious-setting
#14
Hao Wang, Paul A Mann, Li Xiao, Charles Gill, Andrew M Galgoci, John A Howe, Artjohn Villafania, Christopher M Barbieri, Juliana C Malinverni, Xinwei Sher, Todd Mayhood, Megan D McCurry, Nicholas Murgolo, Amy Flattery, Matthias Mack, Terry Roemer
Riboswitches are bacterial-specific, broadly conserved, non-coding RNA structural elements that control gene expression of numerous metabolic pathways and transport functions essential for cell growth. As such, riboswitch inhibitors represent a new class of potential antibacterial agents. Recently, we identified ribocil-C, a highly selective inhibitor of the flavin mononucleotide (FMN) riboswitch that controls expression of de novo riboflavin (RF, vitamin B2) biosynthesis in Escherichia coli. Here, we provide a mechanistic characterization of the antibacterial effects of ribocil-C as well as of roseoflavin (RoF), an antimetabolite analog of RF, among medically significant Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus (MRSA) and Enterococcus faecalis...
April 18, 2017: Cell Chemical Biology
https://www.readbyqxmd.com/read/28434766/stereoselective-synthesis-of-enantiopure-n-substituted-pyrrolidin-2-5-dione-derivatives-by-1-3-dipolar-cycloaddition-and-assessment-of-their-in-vitro-antioxidant-and-antibacterial-activities
#15
Siwar Ghannay, Sana Bakari, Ameni Ghabi, Adel Kadri, Moncef Msaddek, Kaïss Aouadi
1,3-Dipolar cycloaddition between a chiral nitrone and N-substituted maleimides afforded unprecedented enantiopure spiro-fused heterocycles in good yields with a high enantio- and diastereoselectivity. The reaction was taking place on the less hindered face of the nitrone. The obtaining heterocycles were screened for their in vitro antioxidant properties and the results revealed that the potent antioxidant activity was generally recorded to compounds (3g) and (3e). The in vitro antibacterial activities of these two compounds were also investigated and the results demonstrated the strongest potential of compound (3g) against all the tested bacteria...
April 13, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28432381/modulation-of-the-multidrug-efflux-pump-emrd-3-from-vibrio-cholerae-by-allium-sativum-extract-and-the-bioactive-agent-allyl-sulfide-plus-synergistic-enhancement-of-antimicrobial-susceptibility-by-a-sativum-extract
#16
Merissa M Bruns, Prathusha Kakarla, Jared T Floyd, Mun Mun Mukherjee, Robert C Ponce, John A Garcia, Indrika Ranaweera, Leslie M Sanford, Alberto J Hernandez, T Mark Willmon, Grace L Tolson, Manuel F Varela
The causative agent of cholera, Vibrio cholerae, is a public health concern. Multidrug-resistant V. cholerae variants may reduce chemotherapeutic efficacies of severe cholera. We previously reported that the multidrug efflux pump EmrD-3 from V. cholerae confers resistance to multiple structurally distinct antimicrobials. Medicinal plant compounds are potential candidates for EmrD-3 efflux pump modulation. The antibacterial activities of garlic Allium sativum, although poorly understood, predicts that a main bioactive component, allyl sulfide, modulates EmrD-3 efflux...
April 21, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28432320/formation-of-cuo-nano-flowered-surfaces-via-submerged-photo-synthesis-of-crystallites-and-their-antimicrobial-activity
#17
Fumika Nishino, Melbert Jeem, Lihua Zhang, Kazumasa Okamoto, Satoshi Okabe, Seiichi Watanabe
We report the fabrication of flower-like CuO nanostructured surfaces via submerged photo-synthesis of crystallites (SPSC), which requires only UV illumination in neutral water. In this paper, we discuss the reaction mechanism of the photochemical formation of the SPSC-fabricated CuO nanostructures in detail based on surface microstructural analyses and a radiation-chemical consideration with additional gamma-ray irradiation. Since the SPSC method for surface nanostructural fabrication can work at low temperatures at atmospheric pressure without using harmful substances, it is a potential fabrication method for green nanotechnology applications...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28432099/acute-hepatopancreatic-necrosis-disease-ahpnd-causing-vibrio-parahaemolyticus-strains-maintain-an-antibacterial-type-vi-secretion-system-with-versatile-effector-repertoires
#18
Peng Li, Lisa N Kinch, Ann Ray, Ankur B Dalia, Qian Cong, Linda M Nunan, Andrew Camilli, Nick V Grishin, Dor Salomon, Kim Orth
Acute hepatopancreatic necrosis disease (AHPND) is a newly emerging shrimp disease that has severely damaged the global shrimp industry. AHPND is caused by toxic strains of Vibrio parahaemolyticus (V. parahaemolyticus) that have acquired a "selfish plasmid" encoding the deadly binary toxins PirA(vp)/PirB(vp) To better understand the repertoire of virulence factors in AHPND-causing V. parahaemolyticus, we conducted a comparative analysis using genome sequences of the clinical strain RIMD2210633, environmental non-AHPND and toxic AHPND isolates of V...
April 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28429393/synthesis-and-evaluation-of-thiazolidine-amide-and-n-thiazolyl-amide-fluoroquinolone-derivatives
#19
Isaac Garza, Miranda J Wallace, Dinesh Fernando, Aman Singh, Richard E Lee, Jason S Gerding, Cynthia Franklin, Raghunandan Yendapally
In an effort to develop new fluoroquinolones, we synthesized eight compounds and tested them against a panel of bacteria. The design of these compounds was guided by the introduction of the isothiazoloquinolone motif. The three most active compounds in this series, 8-10, demonstrated good antibacterial activity against methicillin-sensitive Staphylococcus aureus and healthcare-acquired methicillin-resistant Staphylococcus aureus (MIC 0.62-6.3 µg/mL). Further, when these three active compounds were tested for their inhibitory effects on bacterial enzymes, compound 9 was the most effective agent exhibiting IC50 values of 33...
April 21, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28425874/in-vitro-and-in-vivo-assessments-of-rhodomyrtus-tomentosa-leaf-extract-as-an-alternative-anti-streptococcal-agent-in-nile-tilapia-oreochromis-niloticus-l
#20
Pinanong Na-Phatthalung, Sasitorn Chusri, Naraid Suanyuk, Supayang Piyawan Voravuthikunchai
PURPOSE: Rhodomyrtustomentosa is a Thai medicinal plant that has been attracting attention for its remarkable antibacterial properties against Gram-positive pathogenic bacteria. The purpose of this study was to evaluate the antibacterial properties of R. tomentosa leaf extract against Streptococcus agalactiae and Streptococcus iniae isolated from infected tilapia. METHODOLOGY: The anti-streptococcal activity of R. tomentosa was determined using broth microdilution assays...
April 21, 2017: Journal of Medical Microbiology
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