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Antimicrobial

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https://www.readbyqxmd.com/read/29166596/the-gcn2-atf4-signaling-pathway-induces-4e-bp-to-bias-translation-and-boost-antimicrobial-peptide-synthesis-in-response-to-bacterial-infection
#1
Deepika Vasudevan, Nicholas K Clark, Jessica Sam, Victoria C Cotham, Beatrix Ueberheide, Michael T Marr, Hyung Don Ryoo
Bacterial infection often leads to suppression of mRNA translation, but hosts are nonetheless able to express immune response genes through as yet unknown mechanisms. Here, we use a Drosophila model to demonstrate that antimicrobial peptide (AMP) production during infection is paradoxically stimulated by the inhibitor of cap-dependent translation, 4E-BP (eIF4E-binding protein; encoded by the Thor gene). We found that 4E-BP is induced upon infection with pathogenic bacteria by the stress-response transcription factor ATF4 and its upstream kinase, GCN2...
November 21, 2017: Cell Reports
https://www.readbyqxmd.com/read/29166538/antimicrobial-photodynamic-therapy-associated-with-conventional-endodontic-treatment-a-clinical-and-molecular-microbiological-study
#2
Caroline C da Silva, Sérgio P Chaves Júnior, Gabriela L D Pereira, Karla B F C da Fontes, Lívia A A Antunes, Helvécio C C Póvoa, Leonardo S Antunes, Natalia L P Póvoa Iorio
This study evaluated antimicrobial photodynamic therapy (aPDT) as an adjunct to endodontic treatment. Ten uniradicular teeth (control group (CG)= 4 (2 and test group (TG)= 6) with primary endodontic infections, from both genders, between 17 and 65 years old, were analyzed. Microbiological samples were collected before and after chemical-mechanical instrumentation (CMI), after aPDT (for the TG), and after the removal of the temporary restorations (second session). In TG, the aPDT was performed with 100 μg/mL methylene blue and irradiated with low power laser (InGaAIP, 660 nm; 100 mW; 40 sec) with a fiber-coupled optical laser...
November 22, 2017: Photochemistry and Photobiology
https://www.readbyqxmd.com/read/29166531/a-polysaccharide-fraction-extracted-from-pleurotus-ostreatus-mycelial-biomass-inhibit-sarcoma-180-tumor
#3
Elisabeth Wisbeck, Jean M Facchini, Endi P Alves, Marcia L L Silveira, Regina M M Gern, Jorge L Ninow, Sandra A Furlan
Fungi of Pleurotus genus have attracted a great interest due to their medicinal properties such as anti-inflammatory, antimicrobial and antitumor. These properties are attributed mainly to polysaccharides synthesized by Pleurotus. This work aimed to study the mycelial growth of P. ostreatus in submerged culture, evaluating the influence of the initial concentration of substrate (20 and 40 g/L of glucose) and the pH (4 and 6) on kinetic parameters of production of biomass. The effectiveness of different doses (10, 30 and 50 mg/kg) of a mycelium polysaccharide fraction extracted from P...
2017: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/29166382/human-milk-h2o2-content-does-it-benefit-preterm-infants
#4
Monika Cieslak, Cristina H F Ferreira, Yulia Shifrin, Jingyi Pan, Jaques Belik
BACKGROUND: Human milk has a high content of the antimicrobial compound hydrogen peroxide (H2O2). As opposed to healthy full-term infants, preterm neonates are fed previously expressed and stored maternal milk. These practices may favor H2O2 decomposition, thus limiting its potential benefit to preterm infants. The goal of this study was to evaluate the factors responsible for H2O2 generation and degradation in breastmilk. METHODS: Human donors' and rat milk, along with rat mammary tissue were evaluated...
November 22, 2017: Pediatric Research
https://www.readbyqxmd.com/read/29165756/the-pathogenic-detection-for-126-children-with-diarrhea-and-drug-sensitivity-tests
#5
X-X Song, D-H Fang, Y-Q Quan, D-J Feng
OBJECTIVE: To investigate the cause of infective diarrhea in children, special distribution of the infection and the drug sensitivity. PATIENTS AND METHODS: We carried out pathogenic detection and drug sensitivity tests for one hundred and twenty-six children with diarrhea, including 67 children in infant group (0-<1 year) and 59 children in child group (1-5 years). RESULTS: Fat particles and starch particles were seen in most stool samples under microscope; 42 kinds of pathogenic bacteria were obtained from 126 stool samples, including 10 Diarrheagenic E...
October 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29165636/reducing-redundant-anaerobic-therapy-through-spaced-education-and-antimicrobial-stewardship-interventions
#6
Kelly B Flett, Athos Bousvaros, Jane Carpenter, Carly E Millrinen, Patricia Martin, Thomas J Sandora
Background: Decreasing the use of redundant anaerobic therapy is a key target for antimicrobial stewardship. Education techniques that optimize knowledge retention could be an important component of reducing these regimens. Methods: We implemented a quality improvement project that incorporated spaced education to reduce the use of redundant anaerobic therapy. The initial interventions (November through December 2015) included education in a hospital-wide newsletter and review of redundant anaerobic regimens by the antimicrobial stewardship program...
November 20, 2017: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/29165561/evaluation-of-short-exposure-times-of-antimicrobial-wound-solutions-against-microbial-biofilms-from-in-vitro-to-in-vivo
#7
K Johani, M Malone, S O Jensen, H G Dickson, I B Gosbell, H Hu, Q Yang, G Schultz, K Vickery
Objectives: Test the performance of topical antimicrobial wound solutions against microbial biofilms using in vitro, ex vivo and in vivo model systems at clinically relevant exposure times. Methods: Topical antimicrobial wound solutions were tested under three different conditions: (in vitro) 4% w/v Melaleuca oil, polyhexamethylene biguanide, chlorhexidine, povidone iodine and hypochlorous acid were tested at short duration exposure times for 15 min against 3 day mature biofilms of Staphylococcus aureus and Pseudomonas aeruginosa; (ex vivo) hypochlorous acid was tested in a porcine skin explant model with 12 cycles of 10 min exposure, over 24 h, against 3 day mature P...
November 18, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29165519/-central-nervous-system-infection-by-bartonella-henselae-associated-with-a-choroid-plexus-papilloma
#8
Natalia Barnafi, Natalia Conca, Cecilia von Borries, Isabel Fuentes, Francisca Montoya, Elisa Alcalde
Bartonella henselae infection is a prevalent illness in Chile. It presents generally as a cat scratch disease or as a prolonged fever syndrome. There are atypical manifestations, which include central nervous system, bone, cardiac and hepato-esplenic compromised. We present an adolescent case with a history of fever, vomiting and ataxia, whose diagnosis was a central nervous system infection by Bartonella henselae associated with a choroid plexus papilloma. This case corresponds to an unusual presentation, with a challenging diagnosis...
August 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/29165513/-a-five-year-experience-with-zoonotic-salmonella-at-a-pediatric-reference-centre
#9
Patricia Barrios, Federica Badía, Valentina Misa, M Inés Mota, Arací Martínez, Hebert Mariño, Gabriela Algorta, Javier Prego, M Catalina Pírez
BACKGROUND: Salmonella can cause asymptomatic infections, diarrhea, bacteremia and focal infections such as meningitis and osteomyelitis. AIM: To describe clinical and microbiological aspects of infections by Salmonella spp. in children in a pediatric referral hospital: Centro Hospitalario Pereira Rossell, in Montevideo, Uruguay. MATERIALS AND METHODS: Descriptive and retrospective study of 46 patients, from which Salmonella spp was isolated between January 1, 2005 and December 31, 2010...
August 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/29165505/-evolutionary-interactions-as-a-possible-mechanism-of-drug-interactions-an-approach-to-the-control-of-antibiotic-resistant-bacteria
#10
Héctor Holguín, Pedro Amariles, William Ospina
In the 21st century, the world is facing a post-antibiotic era, in which the appearance of infections with a minor or no therapeutic alternative is common. In this context, it is essential to implement measures that optimize the available therapeutic tool, thus generating new strategies that strengthen the fight against growing bacterial resistance. The evolutionary interactions suggest that the development of sensitivity or resistance of a microorganism to an antimicrobial will have an inverse effect (collateral sensitivity) or similar (cross resistance) in a second antimicrobial that is involved in this system...
August 2017: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
https://www.readbyqxmd.com/read/29165457/the-chemical-composition-nutritional-value-and-antimicrobial-properties-of-abelmoschus-esculentus-seeds
#11
Spyridon Petropoulos, Ângela Fernandes, Lillian Barros, Ana Ciric, Marina Sokovic, Isabel C F R Ferreira
Okra is a vegetable crop usually used for its immature pods. The harvest stage (fruit size) depends on consumers' preferences and the fruit that does not meet market requirements is being disposed of. Considering the short time interval from the setting of the fruit to the harvest stage, the present study evaluates the nutritional value, chemical composition, and antioxidant and antimicrobial properties of okra seeds from genotypes cultivated under Mediterranean conditions, as an alternative end-use product...
November 22, 2017: Food & Function
https://www.readbyqxmd.com/read/29165439/proteomic-signatures-differentiating-bacillus-anthracis-sterne-sporulation-on-soil-relative-to-laboratory-media
#12
D S Wunschel, J R Hutchison, B L Deatherage Kaiser, E D Merkley, B M Hess, A Lin, M G Warner
The process of sporulation is vital for the stability and infectious cycle of Bacillus anthracis. The spore is the infectious form of the organism and therefore relevant to biodefense. While the morphological and molecular events occurring during sporulation have been well studied, the influence of growth medium and temperature on the proteins expressed in sporulated cultures is not well understood. Understanding the features of B. anthracis sporulation specific to natural vs. laboratory production will address an important question in microbial forensics...
November 22, 2017: Analyst
https://www.readbyqxmd.com/read/29165350/large-scale-analysis-of-antimicrobial-activities-in-relation-to-amphipathicity-and-charge-reveals-novel-characterization-of-antimicrobial-peptides
#13
Chien-Kuo Wang, Ling-Yi Shih, Kuan Y Chang
It has been unclear to which antimicrobial activities (e.g., anti-gram-positive bacterial, anti-gram-negative bacterial, antifungal, antiparasitic, and antiviral activities) of antimicrobial peptides (AMPs) a given physiochemical property matters most. This is the first computational study using large-scale AMPs to examine the relationships between antimicrobial activities and two major physiochemical properties of AMPs-amphipathicity and net charge. The results showed that among all kinds of antimicrobial activities, amphipathicity and net charge best differentiated between AMPs with and without anti-gram-negative bacterial activities...
November 22, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29165349/combating-fusarium-infection-using-bacillus-based-antimicrobials
#14
REVIEW
Noor Khan, Maskit Maymon, Ann M Hirsch
Despite efforts to control toxigenic Fusarium species, wilt and head-blight infections are destructive and economically damaging diseases that have global effects. The utilization of biological control agents in disease management programs has provided an effective, safe, and sustainable means to control Fusarium-induced plant diseases. Among the most widely used microbes for biocontrol agents are members of the genus Bacillus. These species influence plant and fungal pathogen interactions by a number of mechanisms such as competing for essential nutrients, antagonizing pathogens by producing fungitoxic metabolites, or inducing systemic resistance in plants...
November 22, 2017: Microorganisms
https://www.readbyqxmd.com/read/29165344/high-throughput-identification-of-antimicrobial-peptides-from-amphibious-mudskippers
#15
Yunhai Yi, Xinxin You, Chao Bian, Shixi Chen, Zhao Lv, Limei Qiu, Qiong Shi
Widespread existence of antimicrobial peptides (AMPs) has been reported in various animals with comprehensive biological activities, which is consistent with the important roles of AMPs as the first line of host defense system. However, no big-data-based analysis on AMPs from any fish species is available. In this study, we identified 507 AMP transcripts on the basis of our previously reported genomes and transcriptomes of two representative amphibious mudskippers, Boleophthalmus pectinirostris (BP) and Periophthalmus magnuspinnatus (PM)...
November 22, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29165152/detection-of-antibiotic-resistant-acinetobacter-baumannii-in-various-hospital-environments-potential-sources-for-transmission-of-acinetobacter-infections
#16
Zahra Shamsizadeh, Mahnaz Nikaeen, Bahram Nasr Esfahani, Seyed Hamed Mirhoseini, Maryam Hatamzadeh, Akbar Hassanzadeh
BACKGROUND: Antibiotic resistant Acinetobacter baumannii has emerged as one of the most problematic hospital acquired pathogens around the world. This study was designed to investigate the presence of antibiotic resistant A. baumannii in various hospital environments. METHODS: Air, water and inanimate surface samples were taken in different wards of four hospitals and analyzed for the presence of A. baumannii. Confirmed A. baumannii isolates were analyzed for antimicrobial susceptibility and also screened for the presence of three most common OXA- type carbapenemase-encoding genes...
May 8, 2017: Environmental Health and Preventive Medicine
https://www.readbyqxmd.com/read/29165092/synthesis-characterization-and-biological-activities-of-new-symmetric-bis-1-2-3-triazoles-with-click-chemistry
#17
Fatih Celik, Yasemin Unver, Burak Barut, Arzu Ozel, Kemal Sancak
BACKGROUND: 1,2,3-Triazole and its derivatives have important biological activities such as antimicrobial, anti-allergic, analgesic, anti-HIV, antiinflammatory, anticancer, antimalarial and antituberculosis. Other significant triazole derivatives are 1,2,4-triazoles which play a very important role in the medicinal chemistry due to the antiinflammatory, antimicrobial, antimigraine, anticancer, antimicrobial and antimycotic activities. In this study, we aimed to synthesize a new series of bis-1,2,3-triazole derivatives including 1,2,4-triazole to obtain more effective biological activities METHODS: In this study, a new series of bis-1,2,3-triazole compounds (9,10,11) were synthesized...
November 20, 2017: Medicinal Chemistry
https://www.readbyqxmd.com/read/29165086/association-between-ltf-polymorphism-and-risk-of-hiv-1-transmission-among-zambian-seropositive-mothers
#18
Luisa Zupin, Vania Polesello, Ludovica Segat, Anselmo Jiro Kamada, Louise Kuhn, Sergio Crovella
BACKGROUND: Lactoferrin is a member of the innate immune system acting in the first line of defence against pathogens, and it is known for its antibacterial, antifungal and antiviral activity, including HIV-1. Two polymorphisms, T29A and R47K, in the exon 1 region of the LTF gene (encoding for the lactoferrin protein) were previously described as able to influence the lactoferrin antimicrobial function. OBJECTIVES: LTF T29A and R47K genetic variants were analysed in a Zambian population to unravel if these polymorphisms could play a role in HIV-1 mother-to-child HIV-1 transmission...
November 19, 2017: Current HIV Research
https://www.readbyqxmd.com/read/29165071/minocycline-loaded-in-situ-hydrogel-for-periodontitis-treatment
#19
Xiaoqing Wang, Jianli Ma, Xiaoming Zhu, Fang Wang, Liang Zhou
In situ hydrogel based on phase separation by solvent exchange has emerged as an attractive alternative for periodontal pocket injection. In this study, an minocycline (MCL)-loaded in situ hydrogel was prepared composed of poly(lactide-co-glycolide) (PLGA) and N-methylpyrrolidone (NMP) to enhance the topical treatment of periodontitis. A series of reasonable and applicable formulations were optimized by investigating their syringeability, viscosity and in vitro drug release. The rheological profiles, antimicrobial activities and pharmacodynamics were further studied to evaluate its effect on periodontitis treatment...
November 20, 2017: Current Drug Delivery
https://www.readbyqxmd.com/read/29164875/insights-into-the-mechanism-of-action-of-the-two-peptide-lantibiotic-lacticin-3147
#20
Alireza Bakhtiary, Stephen A Cochrane, Pascal Mercier, Ryan T McKay, Mark Miskolzie, Clarissa S Sit, John C Vederas
Lacticin 3147 is a two peptide lantibiotc (LtnA1 and LtnA2) that displays nanomolar activity against many Gram-positive bacteria. Lacticin 3147 may exert its antimicrobial effect by several mechanisms. Isothermal titration calorimetry experiments show that only LtnA1 binds to the peptidoglycan precursor lipid II, which could inhibit peptidoglycan biosynthesis. An experimentally supported model of the resulting complex suggests that the key binding partners are the C-terminus of LtnA1 and pyrophosphate of lipid II...
November 22, 2017: Journal of the American Chemical Society
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