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https://www.readbyqxmd.com/read/28101884/lung-microdialysis-study-of-florfenicol-in-pigs-after-single-intramuscular-administration
#1
B Yang, J D Gao, X Y Cao, Q Y Wang, G Z Sun, J J Yang
For most bacterial lung infections, the concentration of unbound antimicrobial agent in lung interstitial fluid has been considered as the gold standard for estimating the antibacterial efficacy. In this study, the pharmacokinetics of florfenicol (FF) in porcine lung interstitial fluid was investigated after single intramuscular administration at two different doses (20 and 50 mg/kg). Twelve pigs underwent thoracotomy under general anesthesia. Then, the CMA/30 probe was implanted into the lung and perfused at 1 μL/min...
January 19, 2017: Journal of Veterinary Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28101682/synthesis-spectral-and-extended-spectrum-beta-lactamase-studies-of-transition-metal-tetraaza-macrocyclic-complexes
#2
Dinesh Kumar, Nutan Sharma, Manjula Nair
Urinary tract infections commonly occur in humans due to microbial pathogens invading the urinary tract, which can bring about a range of clinical symptoms and potentially fatal sequelae. The present study is aimed at addressing the development of a new antimicrobial agent against extended spectrum beta lactamase (ESBL) producing E. coli bacteria. We have synthesised some biologically potent (NNNN) donor macrocycles (L 1  = dibenzo[f,n]dipyrido[3,4-b:4',3'-j][1,4,9,12]tetraazacyclohexadecine-6,11,18,23(5H,12H, 7H, 24H)-tetraone, and L 2  = 6,12,19,25-tetraoxo-4,6,11,12,16,18,23,24-octahydrotetrabenzo [b,g,k,p][1,5,10,14]tetra azacyclooctadecine-2,13-dicarboxylic acid) and their Ti and Zr metal complexes in alcoholic media using microwave protocol...
January 18, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/28100224/radical-scavenging-activities-of-lagerstroemia-speciosa-l-pers-petal-extracts-and-its-hepato-protection-in-ccl4-intoxicated-mice
#3
Bipransh Kumar Tiwary, Somit Dutta, Priyankar Dey, Mossaraf Hossain, Anoop Kumar, Sony Bihani, Ashis Kumar Nanda, Tapas Kumar Chaudhuri, Ranadhir Chakraborty
BACKGROUND: Lagerstroemia speciosa (L.) Pers. has medicinal importance. Bioactive phytochemicals isolated from different parts of L. speciosa, have revealed hypoglycemic, antibacterial, anti-inflammatory, antioxidant and hepato protective properties. Despite one report from Philippines detailing the use of L. speciosa as curative for fever and as well as diuretic, there is no experimental evidence about the hepatoprotective activity of the flower extracts. METHODS: Several spectroscopic methods, including GC-MS, were used to characterize phytochemicals present in the petal extract of L...
January 18, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28097041/effect-of-catechins-green-tea-extract-and-methylxanthines-in-combination-with-gentamicin-against-staphylococcus-aureus-and-pseudomonas-aeruginosa-combination-therapy-against-resistant-bacteria
#4
Bibi Sedigheh Fazly Bazzaz, Sahar Sarabandi, Bahman Khameneh, Hossein Hosseinzadeh
OBJECTIVES: Bacterial resistant infections have become a global health challenge and threaten the society's health. Thus, an urgent need exists to find ways to combat resistant pathogens. One promising approach to overcoming bacterial resistance is the use of herbal products. Green tea catechins, the major green tea polyphenols, show antimicrobial activity against resistant pathogens. The present study aimed to investigate the effect of catechins, green tea extract, and methylxanthines in combination with gentamicin against standard and clinical isolates of Staphylococcus aureus (S...
December 2016: Journal of Pharmacopuncture
https://www.readbyqxmd.com/read/28096686/peptide-consensus-sequence-determination-for-the-enhancement-of-the-antimicrobial-activity-and-selectivity-of-antimicrobial-peptides
#5
Ammar Almaaytah, Ya'u Ajingi, Ahmad Abualhaijaa, Shadi Tarazi, Nizar Alshar'i, Qosay Al-Balas
The rise of multidrug-resistant bacteria is causing a serious threat to the world's human population. Recent reports have identified bacterial strains displaying pan drug resistance against antibiotics and generating fears among medical health specialists that humanity is on the dawn of entering a post-antibiotics era. Global research is currently focused on expanding the lifetime of current antibiotics and the development of new antimicrobial agents to tackle the problem of antimicrobial resistance. In the present study, we designed a novel consensus peptide named "Pepcon" through peptide consensus sequence determination among members of a highly homologous group of scorpion antimicrobial peptides...
2017: Infection and Drug Resistance
https://www.readbyqxmd.com/read/28096662/synthetic-nanoparticles-of-bovine-serum-albumin-with-entrapped-salicylic-acid
#6
E S Bronze-Uhle, B C Costa, V F Ximenes, P N Lisboa-Filho
Bovine serum albumin (BSA) is highly water soluble and binds drugs or inorganic substances noncovalently for their effective delivery to various affected areas of the body. Due to the well-defined structure of the protein, containing charged amino acids, albumin nanoparticles (NPs) may allow electrostatic adsorption of negatively or positively charged molecules, such that substantial amounts of drug can be incorporated within the particle, due to different albumin-binding sites. During the synthesis procedure, pH changes significantly...
2017: Nanotechnology, Science and Applications
https://www.readbyqxmd.com/read/28096373/pathogen-mediated-manipulation-of-arthropod-microbiota-to-promote-infection
#7
Nabil M Abraham, Lei Liu, Brandon Lyon Jutras, Akhilesh K Yadav, Sukanya Narasimhan, Vissagan Gopalakrishnan, Juliana M Ansari, Kimberly K Jefferson, Felipe Cava, Christine Jacobs-Wagner, Erol Fikrig
Arthropods transmit diverse infectious agents; however, the ways microbes influence their vector to enhance colonization are poorly understood. Ixodes scapularis ticks harbor numerous human pathogens, including Anaplasma phagocytophilum, the agent of human granulocytic anaplasmosis. We now demonstrate that A. phagocytophilum modifies the I. scapularis microbiota to more efficiently infect the tick. A. phagocytophilum induces ticks to express Ixodes scapularis antifreeze glycoprotein (iafgp), which encodes a protein with several properties, including the ability to alter bacterial biofilm formation...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28096238/activation-of-trpa1-channel-by-antibacterial-agent-triclosan-induces-vegf-secretion-in-human-prostate-cancer-stromal-cells
#8
Sandra Derouiche, Pascal Mariot, Marine Warnier, Eric Vancauwenberghe, Gabriel Bidaux, Pierre Gosset, Brigitte Mauroy, Jean-Louis Bonnal, Christian Slomianny, Philippe Delcourt, Etienne Dewailly, Natalia Prevarskaya, Morad Roudbaraki
Accruing evidence indicates that exposure to environmental compounds may adversely impact human health and promote carcinogenesis. Triclosan (TCS), an antimicrobial agent widely used as a preservative in personal care products, has been shown to act as an endocrine disruptor in hormone-dependent tissues. Here we demonstrate a new molecular mechanism by which TCS stimulates the secretion by human prostate cancer stromal cells of Vascular Endothelial Growth Factor (VEGF), a factor known to promote tumour growth...
January 17, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28094220/molecular-docking-discovery-synthesis-and-pharmacological-properties-of-new-6-substituted-2-3-phenoxyphenyl-4-phenyl-quinoline-derivatives-an-approach-to-developing-potent-dna-gyrase-inhibitors-antibacterial-agents
#9
Manikandan Alagumuthu, Sivakumar Arumugam
Synthesis and molecular validation of 6-substituted-2-(3-phenoxyphenyl)-4-phenylquinoline derivatives (4a-h) as antibacterial/DNA gyrase inhibitors reported. Primarily, 6-substituted-2-(3-phenoxyphenyl)-4-phenylquinoline derivatives were docked into the active sites of DNA gyrase A&B, to ensure the binding mode of the compounds, and the results were superior on DNA gyrase A over DNA gyrase B. Based on this, S. aureus DNA gyrase A assay was proposed and executed. Most prominent DNA gyrase inhibition showed by 6-fluoro-2-(3-phenoxyphenyl)-4-phenylquinoline (4c), IC50 0...
January 6, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28094219/3-4-dihydropyrimidinone-coumarin-analogues-as-a-new-class-of-selective-agent-against-s-aureus-synthesis-biological-evaluation-and-molecular-modelling-study
#10
Nirmala S Naik, Lokesh A Shastri, Shrinivas D Joshi, Sheshagiri R Dixit, Bahubali M Chougala, S Samundeeswari, Megharaj Holiyachi, Farzanabi Shaikh, Jyoti Madar, Rashmi Kulkarni, Vinay Sunagar
Bacterial infections are increasingly difficult to combat as bacteria evolve resistance to antibiotic drugs and have severely compromised the arsenal of antibiotic drugs. On the other hand matrix metalloproteinases (MMPs) play a fundamental role in inflammation and extracellular matrix degradation in physiological and pathological conditions. In search of potent antibiotic, taking coumarin and dihydropyrimidinone as lead compound, a green, eco-friendly and efficient protocol has been developed and synthesized the dihydropyrimidin-2(1H)-one/thione derivatives of coumarin 3/4 from substituted 4-formylcoumarins 2 and ethylacetoacetate using urea/thiourea in the presence of catalytic amount of ceric ammonium nitrate is reported...
January 5, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28091587/bacillus-volatiles-adversely-affect-the-physiology-and-ultra-structure-of-ralstonia-solanacearum-and-induce-systemic-resistance-in-tobacco-against-bacterial-wilt
#11
Hafiz Abdul Samad Tahir, Qin Gu, Huijun Wu, Yuedi Niu, Rong Huo, Xuewen Gao
Volatile organic compounds (VOCs) produced by various bacteria have significant potential to enhance plant growth and to control phytopathogens. Six of the most effective antagonistic Bacillus spp. were used in this study against Ralstonia solanacearum (Rsc) TBBS1, the causal agent of bacterial wilt disease in tobacco. Bacillus amyloliquefaciens FZB42 and Bacillus artrophaeus LSSC22 had the strongest inhibitory effect against Rsc. Thirteen VOCs produced by FZB42 and 10 by LSSC22 were identified using gas chromatography-mass spectrometry analysis...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090811/antibacterial-combination-therapy-using-co-3-cu-2-zn-2-and-pd-2-complexes-their-calf-thymus-dna-binding-studies
#12
Fatemeh Khosravi, Hassan Mansouri-Torshizi
Four Co(III)-, Cu(II)-, Zn(II)- and Pd(II)- based potent antibacterial complexes of formula K3[Co(ox)3].3H2O (I), [Cu(bpy)2Cl]Cl.5H2O (II), [Zn(bpy)3]Cl2 (III) and [Pd(bpy)2](NO3)2 (IV) (where ox is oxalate and bpy is 2,2'-bipyridine) were synthesized. They were characterized by elemental analyses, molar conductance measurements, UV-Vis, FT-IR, (1)H NMR and (13)C NMR spectra. These metal complexes were ordered in three combination series of I+II, I+II+III and I+II+III+IV. Antibacterial activity was tested for each of these four metal complexes and their combinations against gram positive and gram negative bacteria...
January 16, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28090277/anti-quorum-sensing-activity-of-substances-isolated-from-wild-berry-associated-bacteria
#13
Suha M Abudoleh, Adel M Mahasneh
BACKGROUND: Quorum Sensing (QS) is a mechanism used by bacteria to determine their physiological activities and coordinate gene expression based on cell to cell signaling. Many bacterial physiological functions are under the regulation of quorum sensing such as virulence, luminescence, motility, sporulation and biofilm formation. The aim of the present study was to isolate and characterize Quorum Sensing Inhibitory (QSI) substances from epiphytic bacteria residing on wild berries surfaces...
January 2017: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/28089350/rickettsia-prowazekii-methionine-aminopeptidase-as-a-promising-target-for-the-development-of-antibacterial-agents
#14
Travis R Helgren, Congling Chen, Phumvadee Wangtrakuldee, Thomas E Edwards, Bart L Staker, Jan Abendroth, Banumathi Sankaran, Nicole A Housley, Peter J Myler, Jonathon P Audia, James R Horn, Timothy J Hagen
Methionine aminopeptidase (MetAP) is a class of ubiquitous enzymes essential for the survival of numerous bacterial species. These enzymes are responsible for the cleavage of N-terminal formyl-methionine initiators from nascent proteins to initiate post-translational modifications that are often essential to proper protein function. Thus, inhibition of MetAP activity has been implicated as a novel antibacterial target. We tested this idea in the present study by targeting the MetAP enzyme in the obligate intracellular pathogen Rickettsia prowazekii...
November 10, 2016: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28087617/in-vitro-activity-of-the-antiasthmatic-drug-zafirlukast-against-the-oral-pathogens-porphyromonas-gingivalis-and-streptococcus-mutans
#15
Evelien Gerits, Isolde Van der Massen, Katleen Vandamme, Kaat De Cremer, Katrijn De Brucker, Karin Thevissen, Bruno P A Cammue, Serge Beullens, Maarten Fauvart, Natalie Verstraeten, Jan Michiels
Oral infections are among the most common diseases worldwide. Many protocols for the prevention and treatment of oral infections have been described, yet no golden standard has been developed so far. The antiseptic chlorhexidine and antibiotics are often used in these treatment procedures. However, long-term use of chlorhexidine can lead to side effects and extensive use of antibiotics can promote the development of antibiotic-resistant bacteria, which in turn can compromise the effectiveness of the treatment...
January 12, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28087253/what-is-an-ideal-antibiotic-discovery-challenges-and-path-forward
#16
REVIEW
Sheo B Singh, Katherine Young, Lynn L Silver
An ideal antibiotic is an antibacterial agent that kills or inhibits the growth of all harmful bacteria in a host, regardless of site of infection without affecting beneficial gut microbes (gut flora) or causing undue toxicity to the host. Sadly, no such antibiotics exist. What exists are many effective Gram-positive antibacterial agents as well as broad-spectrum agents that provide treatment of certain Gram-negative bacteria but not holistic treatment of all bacteria. However effectiveness of all antibacterial agents is being rapidly eroded due to resistance...
January 10, 2017: Biochemical Pharmacology
https://www.readbyqxmd.com/read/28079199/structural-influence-of-proteins-upon-adsorption-to-mos2-nanomaterials-comparison-of-mos2-force-field-parameters
#17
Zonglin Gu, Phil De Luna, Zaixing Yang, Ruhong Zhou
Molybdenum disulfide (MoS2) has recently emerged as a promising nanomaterial in a wide range of applications due to its unique and impressive properties. For example, MoS2 has gained attention in the biomedical field because of its ability to act as an antibacterial and anticancer agent. However, the potential influence of this exciting nanomaterial on biomolecules is yet to be extensively studied. Molecular dynamics (MD) simulations are invaluable tools in the examination of protein interactions with nanomaterials such as MoS2...
January 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28070663/the-pygidial-gland-secretion-of-the-forest-caterpillar-hunter-calosoma-calosoma-sycophanta-the-antimicrobial-properties-against-human-pathogens
#18
REVIEW
Marija Nenadić, Marina Soković, Jasmina Glamočlija, Ana Ćirić, Vesna Perić-Mataruga, Larisa Ilijin, Vele Tešević, Marina Todosijević, Ljubodrag Vujisić, Nikola Vesović, Srećko Ćurčić
Recently, various insect secretions have been tested as possible antimicrobial agents. In beetles, these secretions are essentially products of various exocrine glands, of which particular emphasis is on pygidial glands that are common for the suborder Adephaga. The antimicrobial potential of the pygidial gland secretion isolated from the adults of Calosoma sycophanta against human pathogens has been tested and compared with the potential of other carabid species, particularly within the tribe Carabini. The antimicrobial assay includes a microdilution method which was applied in order to determine the minimal inhibitory, minimal fungicidal and minimal bactericidal concentrations...
February 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28067839/antibacterial-activity-of-neat-chitosan-powder-and-flakes
#19
Nury Ardila, France Daigle, Marie-Claude Heuzey, Abdellah Ajji
This study investigates the antibacterial activity of neat chitosan powder and flakes against three different bacterial species, Escherichia coli, Listeria innocua and Staphylococcus aureus, which are frequent causes of food spoilage. The effect of chitosan concentration and purity, as well as the influence of temperature, ionic strength (salt) and impact of a solid physical support in the medium are examined. Results show that the antibacterial activity of neat chitosan: (i) requires partial solubilisation; (ii) can be promoted by environmental factors such as adequate temperature range, ionic strength and the presence of a solid physical support that may facilitate the attachment of bacteria; (iii) depends on bacterial species, with a sensitivity order of E...
January 6, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28067105/antimicrobial-effects-of-mastic-extract-against-oral-and-periodontal-pathogens
#20
Stefka Koychev, Henrik Dommisch, Hong Chen, Nicole Pischon
BACKGROUND: Various antimicrobial agents are widely used in the therapy of oral inflammatory diseases. However, their side effects and the appearance of drug resistance justify research on natural antimicrobial agents to target oral pathogens that are safe for the host. In the present study, antimicrobial properties of mastic extract on commensal and pathogenic oral bacteria, as well as its possible cytotoxic effect toward cells of epithelial and mesenchymal origin, were evaluated in comparison to the common antimicrobial agents hydrogen peroxide (H2O2) and chlorhexidine digluconate (CHX)...
January 8, 2017: Journal of Periodontology
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