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time dependent antibiotics

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https://www.readbyqxmd.com/read/28822069/characterization-of-ofloxacin-interaction-with-mutated-a91v-quinolone-resistance-determining-region-of-dna-gyrase-in-mycobacterium-leprae-through-computational-simulation
#1
J Nisha, V Shanthi
Mycobacterium leprae, the causal agent of leprosy is non-cultivable in vitro. Thus, the assessment of antibiotic activity against Mycobacterium leprae depends primarily upon the time-consuming mouse footpad system. The GyrA protein of Mycobacterium leprae is the target of the antimycobacterial drug, Ofloxacin. In recent times, the GyrA mutation (A91V) has been found to be resistant to Ofloxacin. This phenomenon has necessitated the development of new, long-acting antimycobacterial compounds. The underlying mechanism of drug resistance is not completely known...
August 18, 2017: Cell Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28819878/aspergillus-bronchitis-in-patients-with-cystic-fibrosis
#2
Claudia Brandt, Jobst Roehmel, Volker Rickerts, Volker Melichar, Nadja Niemann, Carsten Schwarz
Aspergillus fumigatus frequently colonizes the airways of patients with cystic fibrosis (CF) and may cause various severe infections, such as bronchitis. Serological data, sputum dependent markers and longitudinal data of treated cases of Aspergillus bronchitis were evaluated for further description of this infection. This study, which comprises three substudies, aimed to analyze epidemiological data of Aspergillus in CF and the entity of Aspergillus bronchitis. In a first step, data of the German Cystic Fibrosis Registry were used to evaluate the frequency of Aspergillus colonization in patients with CF (n = 2599)...
August 17, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28814112/an-injectable-in-situ-gel-with-cubic-and-hexagonal-nanostructures-for-local-treatment-of-chronic-periodontitis
#3
Liling Mei, Yecheng Xie, Xintian Huang, Jintian Chen, Ying Huang, Bei Wang, Hui Wang, Xin Pan, Chuanbin Wu
Periodontitis is a chronic bacterial infection, and its effective treatment is dependent on the retention of antibiotics of effective concentrations at the periodontal pockets. In this study, a solution-gel based inverse lyotropic liquid crystalline (LLC) system was explored to deliver metronidazole to the periodontal pockets for local treatment of periodontitis. It was found that the metronidazole-loaded LLC precursor spontaneously transformed into gel in the presence of water in the oral cavity. The low viscosity of the precursor would allow its penetration to the rather difficult to reach infection sites, while the adhesiveness and crystalline nanostructures (inverse bicontinuous cubic Pn3m phase and inverse hexagonal phase) of the formed gel would permit its firm adhesion to the periodontal pockets...
November 2017: Drug Delivery
https://www.readbyqxmd.com/read/28812812/a-cost-analysis-of-the-jan-aushadhi-scheme-in-india
#4
Kanchan Mukherjee
Medicines constitute a substantial proportion of out-of-pocket (OOP) expenses in Indian households. In order to address this issue, the Government of India launched the Jan Aushadhi (Medicine for the Masses) Scheme (JAS) to provide cheap generic medicines to the patients (http://janaushadhi.gov.in/about_jan_aushadhi.html). These medicines are provided through the Jan Aushadhi stores established across the country. The objective of this study was to do a quick assessment for policy-makers regarding the objective of the JAS...
January 17, 2017: International Journal of Health Policy and Management
https://www.readbyqxmd.com/read/28811610/antibiotic-induced-release-of-small-extracellular-vesicles-exosomes-with-surface-associated-dna
#5
Andrea Németh, Norbert Orgovan, Barbara W Sódar, Xabier Osteikoetxea, Krisztina Pálóczi, Katalin É Szabó-Taylor, Krisztina V Vukman, Ágnes Kittel, Lilla Turiák, Zoltán Wiener, Sára Tóth, László Drahos, Károly Vékey, Robert Horvath, Edit I Buzás
Recently, biological roles of extracellular vesicles (which include among others exosomes, microvesicles and apoptotic bodies) have attracted substantial attention in various fields of biomedicine. Here we investigated the impact of sustained exposure of cells to the fluoroquinolone antibiotic ciprofloxacin on the released extracellular vesicles. Ciprofloxacin is widely used in humans against bacterial infections as well as in cell cultures against Mycoplasma contamination. However, ciprofloxacin is an inducer of oxidative stress and mitochondrial dysfunction of mammalian cells...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28811347/tifa-signaling-in-gastric-epithelial-cells-initiates-the-cag-type-4-secretion-system-dependent-innate-immune-response-to-helicobacter-pylori-infection
#6
Alevtina Gall, Ryan G Gaudet, Scott D Gray-Owen, Nina R Salama
Helicobacter pylori is a bacterial pathogen that colonizes the human stomach, causing inflammation which, in some cases, leads to gastric ulcers and cancer. The clinical outcome of infection depends on a complex interplay of bacterial, host genetic, and environmental factors. Although H. pylori is recognized by both the innate and adaptive immune systems, this rarely results in bacterial clearance. Gastric epithelial cells are the first line of defense against H. pylori and alert the immune system to bacterial presence...
August 15, 2017: MBio
https://www.readbyqxmd.com/read/28807478/role-of-lipid-mediators-in-the-regulation-of-oxidative-stress-and-inflammatory-responses-in-dairy-cattle
#7
REVIEW
Vengai Mavangira, Lorraine M Sordillo
Periparturient dairy cows experience an increased incidence and severity of several inflammatory-based diseases such as mastitis and metritis. Factors associated with the physiological adaptation to the onset of lactation can impact the efficiency of the inflammatory response at a time when it is most needed to eliminate infectious pathogens that cause these economically important diseases. Oxidative stress, for example, occurs when there is an imbalance between the production of oxygen radicals during periods of high metabolic demand and the reduced capabilities of the host's antioxidant defenses...
August 2, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28797895/patterns-of-c-reactive-protein-ratio-predicts-outcomes-in-healthcare-associated-pneumonia-in-critically-ill-patients-with-cancer
#8
Ligia S C F Rabello, Pedro Póvoa, Jose R Lapa E Silva, Luciano C P Azevedo, Fernando Jose da Silva Ramos, Thiago Lisboa, Marcio Soares, Jorge I F Salluh
PURPOSE: Describe the patterns of C-reactive protein relative changes in response to antibiotic therapy in critically ill cancer patients with healthcare-associated pneumonia (HCAP) and its ability to predict outcome. METHODS: Secondary analysis of a prospective cohort of critically ill cancer patients with HCAP. CRP was sampled every other day from D0 to D6 of antibiotic therapy. Patients were classified according to an individual pattern of CRP-ratio response: fast - CRP at D4 of therapy was <0...
July 11, 2017: Journal of Critical Care
https://www.readbyqxmd.com/read/28797073/assessment-of-veterinary-drugs-in-plants-using-pharmacokinetic-approaches-the-absorption-distribution-and-elimination-of-tetracycline-and-sulfamethoxazole-in-ephemeral-vegetables
#9
Hui-Ru Chen, Tirawat Rairat, Shih-Hurng Loh, Yu-Chieh Wu, Thomas W Vickroy, Chi-Chung Chou
The present study was carried out to demonstrate novel use of pharmacokinetic approaches to characterize drug behaviors/movements in the vegetables with implications to food safety. The absorption, distribution, metabolism and most importantly, the elimination of tetracycline (TC) and sulfamethoxazole (SMX) in edible plants Brassica rapa chinensis and Ipomoea aquatica grown hydroponically were demonstrated and studied using non-compartmental pharmacokinetic analysis. The results revealed drug-dependent and vegetable-dependent pharmacokinetic differences and indicated that ephemeral vegetables could have high capacity accumulating antibiotics (up to 160 μg g-1 for TC and 38 μg g-1 for SMX) within hours...
2017: PloS One
https://www.readbyqxmd.com/read/28789609/dose-and-time-dependency-of-the-toxicity-and-pharmacokinetic-profiles-of-bedaquiline-and-its-n-desmethyl-metabolite-in-dogs
#10
Ilham Smyej, Sandra De Jonghe, Adriana Looszova, Geert Mannens, Tom Verhaeghe, Sandy Thijssen, Sofie Starckx, Ann Lampo, Marie-Claude Rouan
Bedaquiline (BDQ) is an antibiotic to treat pulmonary multidrug-resistant tuberculosis (MDR-TB). Studies up to 39 weeks were conducted orally in dogs to assess the toxicity and pharmacokinetics of BDQ and its N-desmethyl metabolite (D-BDQ). Phospholipidosis (PLD) seen in the monocytic phagocytic system was considered an adaptive change. Skeletal muscle, heart, stomach, liver, and pancreas toxicities with D-BDQ as the main contributor were associated with a less-than-dose-proportional increase in plasma exposure and an overproportional tissue uptake of BDQ and D-BDQ at high-dose levels...
January 1, 2017: Toxicologic Pathology
https://www.readbyqxmd.com/read/28780877/-identification-of-risk-factors-of-multiresistant-infections-on-two-intensive-care-units
#11
Marcell Szabó, Noémi Kanász, Katalin Darvas, János Gál
INTRODUCTION: Intensive care units are favourable environment for infections, many of them are caused by antibiotic resistant bacteria. AIM: Identifying risk factors of ICU-acquired multiresistant infections. METHOD: We performed observational study on two academic intensive care units (a multidisciplinary and a surgical ICU) between 01/09/2014 and 30/11/2015. Patients with a first infection caused by predefined organisms (P. aeruginosa, E...
August 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28780692/factors-influencing-adsorption-and-desorption-of-trimethoprim-on-marine-sediments-mechanisms-and-kinetics
#12
Jia Li, Hua Zhang
Adsorption-desorption behavior of ionic antibiotics in natural aquatic environment is complex, especially in coastal or estuary area where influencing factors such as pH and salinity usually varied in a wide range. In this study, batch-type and stirred flow chamber (SFC) experiments were carried out to simulate the sorption-desorption behavior of trimethoprim (TMP) in seawater-sediment system. Equilibrium and kinetic modeling were carried out to determine the rate and extent of TMP sorption on two marine sediments with different properties...
August 5, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28772141/vancomycin-sorption-on-activated-sludge-gram-bacteria-rather-than-on-eps-3d-confocal-laser-scanning-microscopy-time-lapse-imaging
#13
J N Louvet, C Carrion, T Stalder, M Alrhmoun, M Casellas, O Potier, M N Pons, C Dagot
Antibiotics-bacteria interactions depend on antibiotic concentration at the scale of bacteria. This study investigates how vancomycin penetrates into activated sludge flocs and can be sorbed on the bacteria and extracellular polymeric substances (EPS). The 3D structure of flocs was imaged using EPS autofluorescence. The green fluorescent BODIPY(®) FL vancomycin was introduced in a microscopic chamber containing activated sludge and penetration of vancomycin into the flocs by diffusion was observed using time-lapse microscopy...
July 26, 2017: Water Research
https://www.readbyqxmd.com/read/28771932/acute-liver-failure-induced-by-idiosyncratic-reaction-to-drugs-challenges-in-diagnosis-and-therapy
#14
Shannan R Tujios, William M Lee
Acute liver failure (ALF) requires urgent attention to identify etiology and determine prognosis, in order to assess likelihood of survival or need for transplantation. Identifying idiosyncratic drug-induced liver injury (iDILI) may be particularly difficult, but the illness generally follows a subacute course, allowing time to assess outcome and find a liver graft if needed. Not all drugs that cause iDILI lead to ALF; the most common are antibiotics including anti-tuberculous medications, non-steroidal anti-inflammatory agents and herbal and dietary supplements (HDS)...
August 3, 2017: Liver International: Official Journal of the International Association for the Study of the Liver
https://www.readbyqxmd.com/read/28768551/feed-additive-probiotics-accelerate-yet-antibiotics-delay-intestinal-microbiota-maturation-in-broiler-chicken
#15
Pengfei Gao, Chen Ma, Zheng Sun, Lifeng Wang, Shi Huang, Xiaoquan Su, Jian Xu, Heping Zhang
BACKGROUND: Reducing antibiotics overuse in animal agriculture is one key in combat against the spread of antibiotic resistance. Probiotics are a potential replacement of antibiotics in animal feed; however, it is not clear whether and how probiotics and antibiotics differ in impact on physiology and microbial ecology of host animals. RESULTS: Host phenotype and fecal microbiota of broilers with either antibiotics or probiotics as feed additive were simultaneously sampled at four time points from birth to slaughter and then compared...
August 3, 2017: Microbiome
https://www.readbyqxmd.com/read/28763019/use-of-antibiotics-for-maintenance-of-axenic-cultures-of-amphidinium-carterae-for-the-analysis-of-translation
#16
Chieh-Lun Liu, Allen R Place, Rosemary Jagus
Most dinoflagellates in culture are bacterized, complicating the quantification of protein synthesis, as well as the analysis of its regulation. In bacterized cultures of Amphidinium carterae Hulbert, up to 80% of protein synthetic activity appears to be predominantly bacterial based on responses to inhibitors of protein synthesis. To circumvent this, axenic cultures of A. carterae were obtained and shown to respond to inhibitors of protein synthesis in a manner characteristic of eukaryotes. However, these responses changed with time in culture correlating with the reappearance of bacteria...
August 1, 2017: Marine Drugs
https://www.readbyqxmd.com/read/28754611/transdermal-delivery-of-gentamicin-using-dissolving-microneedle-arrays-for-potential-treatment-of-neonatal-sepsis
#17
Patricia González-Vázquez, Eneko Larrañeta, Maelíosa T C McCrudden, Courtney Jarrahian, Annie Rein-Weston, Manjari Quintanar-Solares, Darin Zehrung, Helen McCarthy, Aaron J Courtenay, Ryan F Donnelly
Neonatal infections are a leading cause of childhood mortality in low-resource settings. World Health Organization guidelines for outpatient treatment of possible serious bacterial infection (PSBI) in neonates and young infants when referral for hospital treatment is not feasible include intramuscular gentamicin (GEN) and oral amoxicillin. GEN is supplied as an aqueous solution of gentamicin sulphate in vials or ampoules and requires health care workers to be trained in dose calculation or selection of an appropriate dose based on the patient's weight band and to have access to safe injection supplies and appropriate sharps disposal...
July 25, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28751010/incidence-risk-factors-and-outcome-of-multi-drug-resistant-acinetobacter-baumannii-acquisition-during-an-outbreak-in-a-burns-unit
#18
Anne-Lise Munier, Lucie Biard, Clotilde Rousseau, Matthieu Legrand, Matthieu Lafaurie, Alexandra Lomont, Jean-Luc Donay, Eugénie de Beaugrenier, Rémi Flicoteaux, Alexandre Mebazaa, Maurice Mimoun, Jean-Michel Molina
BACKGROUND: Multi-drug resistant Acinetobacter baumannii (MR-AB) can cause outbreaks in a burns unit (BU). We aimed to study the incidence, risk factors and outcome of MR-AB colonization during an outbreak. METHODS: We conducted a prospective study from April to November 2014 in a BU in Paris. Weekly surveillance cultures of patients and their environment were performed. MR-AB acquisition, discharge or death without MR-AB colonization were considered as competing events...
July 24, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28750328/inactivation-efficiency-of-plasmid-encoded-antibiotic-resistance-genes-during-water-treatment-with-chlorine-uv-and-uv-h2o2
#19
Younggun Yoon, Hay Jung Chung, Doris Yoong Wen Di, Michael C Dodd, Hor-Gil Hur, Yunho Lee
This study assessed the inactivation efficiency of plasmid-encoded antibiotic resistance genes (ARGs) both in extracellular form (e-ARG) and present within Escherichia coli (intracellular form, i-ARG) during water treatment with chlorine, UV (254 nm), and UV/H2O2. A quantitative real-time PCR (qPCR) method was used to quantify the ARG damage to amp(R) (850 bp) and kan(R) (806 bp) amplicons, both of which are located in the pUC4K plasmid. The plate count and flow cytometry methods were also used to determine the bacterial inactivation parameters, such as culturability and membrane damage, respectively...
June 22, 2017: Water Research
https://www.readbyqxmd.com/read/28746884/effects-of-single-and-combined-use-of-bacteriophages-and-antibiotics-to-inactivate-escherichia-coli
#20
Nádia Valério, Cristiana Oliveira, Vânia Jesus, Tatiana Branco, Carla Pereira, Catarina Moreirinha, Adelaide Almeida
A major concern of phage therapy is the emergency of phage-resistant mutants. This limitation can be overcome by the combined use of phages and antibiotics. It has been shown that the combination of antibiotics and phages is an alternative that cannot only be effective at reducing bacterial numbers, but also to contribute to the management of resistance levels. However, this view has only been discussed with regard to antibiotic resistance and not to control phage-mutant emergence. In our study we compared not only the resistance of the bacteria to the four antibiotics tested with and without phages addition, but also the resistance to the phages in the presence and absence of antibiotics...
July 23, 2017: Virus Research
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