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https://www.readbyqxmd.com/read/29778036/polymeric-nanoparticles-as-a-platform-for-permeability-enhancement-of-class-iii-drug-amikacin
#1
Saman Fatima, Zeenat Iqbal, A K Panda, M Samim, Sushama Talegaonkar, Farhan Jalees Ahmad
Amikacin (A), a water soluble aminoglycoside antibiotic is commercially available for intravenous administration only. Present investigation is aimed at the development of poly-lactic-co-glycolic acid (PLGA) nanoparticles (A-NPs).1 for oral permeability enhancement of amikacin. The pharmaceutical attributes of the A-NPs revealed particle size, 260.3 ± 2.05 nm, zeta potential, -12.9 ± 1.12 mV and drug content, 40.10 ± 1.87 μg/mg with spherical shape and smooth surface. In vitro antibacterial studies showed that the A-NPs were active against P...
May 16, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29776363/rapid-detection-of-carbapenemase-activity-of-enterobacteriaceae-isolated-from-positive-blood-cultures-by-maldi-tof-ms
#2
Jiajia Yu, Jingxian Liu, Yuanrui Li, Jing Yu, Weinan Zhu, Ying Liu, Lisong Shen
BACKGROUND: Matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS) has been proved to be a useful tool for identification of pathogens directly isolated from blood cultures in clinical microbiology laboratories. β-Lactam antibiotics are commonly used for treatment of bloodstream infections caused by Enterobacteriaceae strains, and carbapenem is the superlative class of β-lactam antibiotics. Since the carbapenem resistance rate of Enterobacteriaceae strains raised year by year, efficient detection of carbapenemase activity and timely delivery of carbapenem susceptibility reports of Enterobacteriaceae strains isolated from blood cultures is important for clinicians...
May 18, 2018: Annals of Clinical Microbiology and Antimicrobials
https://www.readbyqxmd.com/read/29775296/incorporation-of-a-theranostic-two-tone-luminescent-silver-complex-into-biocompatible-agar-hydrogel-composite-for-the-eradication-of-eskape-pathogens-in-a-skin-and-soft-tissue-infection-model
#3
Miguel N Pinto, Jorge Martinez-Gonzalez, Indranil Chakraborty, Pradip K Mascharak
Microbial invasion and colonization of the skin and underlying soft tissues are among the most common types of infections, becoming increasingly prevalent in hospital settings. Systemic antibiotic chemotherapies are now extremely limited due to emergence of drug-resistant Gram-positive and multidrug-resistant Gram-negative bacterial strains. Topical administration of antimicrobials provides an effective route for the treatment of skin and soft tissue infections (SSTIs). Therefore, the development of new and effective materials for the delivery of these agents is of paramount importance...
May 18, 2018: Inorganic Chemistry
https://www.readbyqxmd.com/read/29773788/immunogene-therapy-with-fusogenic-nanoparticles-modulates-macrophage-response-to-staphylococcus-aureus
#4
Byungji Kim, Hong-Bo Pang, Jinyoung Kang, Ji-Ho Park, Erkki Ruoslahti, Michael J Sailor
The incidence of adverse effects and pathogen resistance encountered with small molecule antibiotics is increasing. As such, there is mounting focus on immunogene therapy to augment the immune system's response to infection and accelerate healing. A major obstacle to in vivo gene delivery is that the primary uptake pathway, cellular endocytosis, results in extracellular excretion and lysosomal degradation of genetic material. Here we show a nanosystem that bypasses endocytosis and achieves potent gene knockdown efficacy...
May 17, 2018: Nature Communications
https://www.readbyqxmd.com/read/29772345/autologous-liquid-platelet-rich-fibrin-a-novel-drug-delivery-system
#5
REVIEW
Richard J Miron, Yufeng Zhang
There is currently widespread interest within the biomaterial field to locally deliver biomolecules for bone and cartilage regeneration. Substantial work to date has focused on the potential role of these biomolecules during the healing process, and the carrier system utilized is a key factor in their effectiveness. Platelet rich fibrin (PRF) is a naturally derived fibrin scaffold that is easily obtained from peripheral blood following centrifugation. Slower centrifugation speeds have led to the commercialization of a liquid formulation (liquid-PRF) resulting in an upper plasma layer composed of liquid fibrinogen/thrombin prior to clot formation that remains in its liquid phase for approximately 15 minutes until injected into bodily tissues...
May 14, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29767993/multi-metallic-microparticles-increase-the-potency-of-rifampicin-against-intracellular-mycobacterium-tuberculosis
#6
Timothy Ellis, Michele Chiappi, Andres Garcia-Trenco, Maryam Al-Ejji, Srijata Sarkar, Theoni K Georgiou, Milo Sebastian Peter Shaffer, Teresa D Tetley, Stephan Schwander, Mary P Ryan, Alexandra E Porter
Mycobacterium tuberculosis (M.tb) has the extraordinary ability to adapt to the administration of antibiotics through the development of resistance mechanisms. By rapidly exporting drugs from within the cytosol, these pathogenic bacteria diminish antibiotic potency and drive the presentation of drug tolerant tuberculosis (TB). The membrane integrity of M.tb is pivotal in retaining these drug-resistant traits. Silver (Ag) and zinc oxide (ZnO) nanoparticles (NPs) are established antimicrobial agents that effectively compromise membrane stability, giving rise to increased bacterial permeability to antibiotics...
May 16, 2018: ACS Nano
https://www.readbyqxmd.com/read/29764503/bacteriological-profile-of-neonatal-sepsis-and-antibiotic-susceptibility-pattern-of-isolates-admitted-at-kanti-children-s-hospital-kathmandu-nepal
#7
Nikita Singh Yadav, Saroj Sharma, Dhiraj Kumar Chaudhary, Prabhat Panthi, Pankaj Pokhrel, Anil Shrestha, Pappu Kumar Mandal
OBJECTIVE: Neonatal sepsis is a major cause of morbidity and mortality of newborns (< 1 month of age). Septicemia and drug resistance is a predominant issue for neonatal death in Nepal. This study is intended to find bacteriological profile of neonatal sepsis and antibiotic susceptibility pattern of the isolates from neonates at Kanti Children's Hospital, Kathmandu, Nepal. RESULTS: Out of 350 suspected cases of neonatal sepsis, 59 (16.9%) cases showed positive blood culture...
May 15, 2018: BMC Research Notes
https://www.readbyqxmd.com/read/29763756/tobramycin-mediated-silver-nanospheres-graphene-oxide-composite-for-synergistic-therapy-of-bacterial-infection
#8
Sadeeq Ullah, Aftab Ahmad, Fazli Subhan, Aminullah Jan, Muslim Raza, Arif Ullah Khan, Aziz-Ur Rahman, Usman Ali Khan, Muhammad Tariq, Qipeng Yuan
Graphene-based materials have attracted a significant attention in constructing hybrid systems for drug delivery with enhanced antimicrobial activities. In our work, we demonstrated the formation of silver nanoparticles (AgNPs) on graphene oxide (GO) using tobramycin (TOB), an aminoglycoside antibiotic, as reducing and decorating agent. The TOB decorated GO AgNPs (TOB-GO-Ag) composite was used as an antibacterial agent against multi-drug resistant Gram-negative E-coli (BL21 DE3). The reversal of surface potential from -30 mV (GO) to +20 mV confirms the successful reduction of GO by TOB...
May 7, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29761674/screening-arab-israeli-pregnant-women-for-group-b-streptococcus-by-the-amplivue-gbs-assay-are-the-rates-higher-than-the-national-average
#9
Marwan Hakim, Adel Jabour, Miriam Anton, Meggie Hakim, Sahar Kheirallah
BACKGROUND: The recommendation of the U.S. Centers for Disease Control and Prevention regarding universal screening for Group B Streptococcus (GBS) at 35-37 weeks gestational age in pregnancy is not accepted in Israel. The National Council for Obstetrics, Neonatology and Genetics recommends intrapartum prophylaxis, mainly based on risk factors, to prevent early neonatal GBS infection. This policy is based on past studies demonstrating low colonization rates of the bacteria in Israeli pregnant women and very low neonatal sepsis rates...
May 2018: Israel Medical Association Journal: IMAJ
https://www.readbyqxmd.com/read/29760101/design-of-an-allosterically-modulated-doxycycline-and-doxorubicin-drug-binding-protein
#10
Karin Schmidt, Bernd R Gardill, Alina Kern, Peter Kirchweger, Michael Börsch, Yves A Muller
The allosteric interplay between distant functional sites present in a single protein provides for one of the most important regulatory mechanisms in biological systems. While the design of ligand-binding sites into proteins remains challenging, this holds even truer for the coupling of a newly engineered binding site to an allosteric mechanism that regulates the ligand affinity. Here it is shown how computational design algorithms enabled the introduction of doxycycline- and doxorubicin-binding sites into the serine proteinase inhibitor (serpin) family member α1-antichymotrypsin...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29760099/hydrogel-delivery-of-lysostaphin-eliminates-orthopedic-implant-infection-by-staphylococcus-aureus-and-supports-fracture-healing
#11
Christopher T Johnson, James A Wroe, Rachit Agarwal, Karen E Martin, Robert E Guldberg, Rodney M Donlan, Lars F Westblade, Andrés J García
Orthopedic implant infections are a significant clinical problem, with current therapies limited to surgical debridement and systemic antibiotic regimens. Lysostaphin is a bacteriolytic enzyme with high antistaphylococcal activity. We engineered a lysostaphin-delivering injectable PEG hydrogel to treat Staphylococcus aureus infections in bone fractures. The injectable hydrogel formulation adheres to exposed tissue and fracture surfaces, ensuring efficient, local delivery of lysostaphin. Lysostaphin encapsulation within this synthetic hydrogel maintained enzyme stability and activity...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29757658/a-macropinocytosis-intensifying-albumin-domain-based-scfv-antibody-and-its-conjugate-directed-against-k-ras-mutant-pancreatic-cancer
#12
Xiaofei Wang, Weijin Sheng, Yangyang Wang, Liang Li, Yi Li, Shenghua Zhang, Xiujun Liu, Shuzhen Chen, Yongsu Zhen
Enhanced macropinocytosis has been found in K-Ras mutant pancreatic cancer cells and through which albumin can massively enter into the K-Ras driven cancer cells suggesting its role serving as micropinocytosis-intensifying drug delivery carrier. In the present study, a novel recombinant protein Fv-LDP-D3 and its reconstituted analogue Fv-LDP-D3-AE were designed and prepared. In which, Fv is the fragment of an anti-EGFR antibody, D3 is the domain III of HSA, LDP is the apoprotein of the antitumor antibiotic lidamycin (LDM), and AE is an extremely cytotoxic enediyne derived from LDM...
May 14, 2018: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/29752111/doxorubicin-dna-adduct-entrenched-and-motif-tethered-artificial-virus-encased-in-ph-responsive-polypeptide-complex-for-targeted-cancer-therapy
#13
K C Ajithkumar, K Pramod
Doxorubicin is a broad spectrum anticancer antibiotic that possesses toxic effects such as cardiomyopathy, that even lead to congestive heart failure. Thus, the development of a new bio-inspired system is required, that retain the advantageous effect of doxorubicin while retarding the side effects. Hence, a system was developed that we describe 'doxorubicin-DNA adduct entrenched artificial virus encased in polypeptide complex'. The drug-DNA adduct (DDA) was prepared by a formaldehyde mediated reaction. A simple chloroform extraction method for the separation of DDA was developed...
August 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29748896/improving-the-stability-and-the-pharmaceutical-properties-of-norfloxacin-form-c-through-binary-complexes-with-%C3%AE-cyclodextrin
#14
Claudia Garnero, Ana Karina Chattah, Carolina Aloisio, Luis Fabietti, Marcela Longhi
Norfloxacin, an antibiotic that exists in different solid forms, has very unfavorable properties in terms of solubility and stability. Binary complexes of norfloxacin, in the solid form C, and β-cyclodextrin were procured by the kneading method and physical mixture. Their effect on the solubility, the dissolution rate, and the chemical and physical stability of norfloxacin was evaluated. To perform stability studies, the solid samples were stored under accelerated storage conditions, for a period of 6 months...
May 10, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29748872/two-photon-probes-for-in-vivo-multicolor-microscopy-of-the-structure-and-signals-of-brain-cells
#15
REVIEW
Clément Ricard, Erica D Arroyo, Cynthia X He, Carlos Portera-Cailliau, Gabriel Lepousez, Marco Canepari, Daniel Fiole
Imaging the brain of living laboratory animals at a microscopic scale can be achieved by two-photon microscopy thanks to the high penetrability and low phototoxicity of the excitation wavelengths used. However, knowledge of the two-photon spectral properties of the myriad fluorescent probes is generally scarce and, for many, non-existent. In addition, the use of different measurement units in published reports further hinders the design of a comprehensive imaging experiment. In this review, we compile and homogenize the two-photon spectral properties of 280 fluorescent probes...
May 11, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29746379/factors-influencing-the-intestinal-microbiome-during-the-first-year-of-life
#16
Petra Zimmermann, Nigel Curtis
The intestinal microbiome plays a crucial role in the development of the immune system and regulation of immune responses. Many factors influence the composition of the infant intestinal microbiome and therefore the development and function of the immune system. This in turn may alter the risk of subsequent allergies, autoimmune diseases and other adverse health outcomes. Here, we review factors that influence the composition of the intestinal microbiome during the first year of life, including birth location, gestational age, delivery mode, feeding method, hospitalization, antibiotic and probiotic intake, and living conditions...
May 9, 2018: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/29744453/studies-on-the-cytocompatibility-mechanical-and-antimicrobial-properties-of-3d-printed-poly-methyl-methacrylate-beads
#17
David K Mills, Uday Jammalamadaka, Karthik Tappa, Jeffery Weisman
Osteomyelitis is typically a bacterial infection (usually from Staphylococcus) or, more rarely, a fungal infection of the bone. It can occur in any bone in the body, but it most often affects the long bones (leg and arm), vertebral (spine), and bones of the foot. Microbial success in osteomyelitis is due to their ability to form biofilms which inhibit the wound healing process and increases resistance to anti-infective agents. Also, biofilms do not allow easy penetration of antibiotics into their matrix making clinical treatment a challenge...
June 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29744436/lipid-polymer-hybrid-nanoparticles-development-statistical-optimization-of-norfloxacin-for-topical-drug-delivery-system
#18
Vivek Dave, Renu Bala Yadav, Kriti Kushwaha, Sachdev Yadav, Swapnil Sharma, Udita Agrawal
Poly lactic acid is a biodegradable, biocompatible, and non-toxic polymer, widely used in many pharmaceutical preparations such as controlled release formulations, parenteral preparations, surgical treatment applications, and tissue engineering. In this study, we prepared lipid-polymer hybrid nanoparticles for topical and site targeting delivery of Norfloxacin by emulsification solvent evaporation method (ESE). The design of experiment (DOE) was done by using software to optimize the result, and then a surface plot was generated to compare with the practical results...
December 2017: Bioactive Materials
https://www.readbyqxmd.com/read/29742307/the-effects-of-essential-oils-and-their-major-compounds-on-fish-bacterial-pathogens-a-review
#19
REVIEW
Jessyka A da Cunha, Berta M Heinzmann, Bernardo Baldisserotto
The increased resistance of fish pathogens to conventional treatments has lead researchers to investigate the antibacterial properties of natural resources, such as essential oils (EOs) of plants, in an effort to find products that are less harmful to the environment. The objective of this review is to provide an overview of the studies, in vivo and in vitro, that addressed the use of EOs and their major compounds as antimicrobial agents in fish, to identify the best EOs and compounds to investigate considering feasibility of application and suggest possible future studies...
May 9, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29738907/dual-role-of-layered-double-hydroxide-nanocomposites-on-antibacterial-activity-and-degradation-of-tetracycline-and-oxytetracyline
#20
Zaineb Bouaziz, Laurence Soussan, Jean-Marc Janot, Maguy Jaber, Abdesslem Ben Haj Amara, Sebastien Balme
The antibiotic intercalation inside the layered double hydroxide (LDH) layers was usually considered for water decontamination but rarely for drug delivery. Here, tetracycline (TCH) and oxytetracycline (OXY) were immobilized in Zn2 Al-Cl LDH following two methods: co-precipitation and anionic exchange. The interfacial concentration of antibiotic varies from 0.04 to 0.5 depending the method of immobilization. The antibiotics are not intercalated in the interlayer space allowing their release in 10 Hours. The antibacterial activity against both E...
May 2, 2018: Chemosphere
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