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https://www.readbyqxmd.com/read/29138101/primary-antibiotic-resistance-of-helicobacter-pylori-in-chinese-patients-a-multi-region-prospective-7-year-study
#1
Dong-Sheng Liu, You-Hua Wang, Zhi-Rong Zeng, Zhen-Yu Zhang, Hong Lu, Jian-Ming Xu, Yi-Qi Du, Yan Li, Jiang-Bin Wang, San-Ping Xu, Ye Chen, Chun-Hui Lan, Hong Cheng, Ming-de Jiang, Ling-Xia Zhang, Li-Juan Huo, Shi-Yao Chen, Guo-Xin Zhang, Kai-Chun Wu, Xuan Zhu, You-Xiang Chen, Yin Zhu, Xu Shu, Yong Xie, Nong-Hua Lu
OBJECTIVES: To explore the characteristics of H. pylori resistance in China and the association between antibiotic resistance and several clinical factors. METHODS: H. pylori strains were collected from patients in 13 provinces/cities in China between 2010 and 2016. Demographic data including type of disease, geographic area, age, gender and isolation year were collected to analyse their association with antibiotic resistance. Antibiotic resistance was detected using the Epsilometer test and the Kirby-Bauer disk diffusion method...
November 11, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29136469/novel-linear-lipopeptide-paenipeptins-with-potential-for-eradicating-biofilms-and-sensitizing-gram-negative-bacteria-to-rifampicin-and-clarithromycin
#2
Sun Hee Moon, Xuan Zhang, Guangrong Zheng, Daniel G Meeker, Mark S Smeltzer, En Huang
We report the structure-activity relationship (SAR) analyses of 17 linear lipopeptide paenipeptin analogues. Analogues 7, 12 and 17 were more potent than the lead compound. Analogue 17 was active against carbapenem-resistant and polymyxin-resistant pathogens. This compound at 40 μg/mL resulted in 3 log and 2.6 log reductions of methicillin-resistant Staphylococcus aureus and Pseudomonas aeruginosa, respectively, in catheter-associated biofilms in vitro. Analogue 17 showed little hemolysis at 32 µg/ml and lysed 11% of red blood cells at 64 µg/ml...
November 14, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29136155/a-model-informed-preclinical-approach-for-prediction-of-clinical-pharmacodynamic-interactions-of-anti-tb-drug-combinations
#3
Oskar Clewe, Sebastian G Wicha, Corné P de Vogel, Jurriaan E M de Steenwinkel, Ulrika S H Simonsson
Background: Identification of pharmacodynamic interactions is not reasonable to carry out in a clinical setting for many reasons. The aim of this work was to develop a model-informed preclinical approach for prediction of clinical pharmacodynamic drug interactions in order to inform early anti-TB drug development. Methods: In vitro time-kill experiments were performed with Mycobacterium tuberculosis using rifampicin, isoniazid or ethambutol alone as well as in different combinations at clinically relevant concentrations...
November 9, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/29133554/what-is-resistance-impact-of-phenotypic-versus-molecular-drug-resistance-testing-on-multi-and-extensively-drug-resistant-tuberculosis-therapy
#4
Jan Heyckendorf, Sönke Andres, Claudio U Köser, Ioana D Olaru, Thomas Schön, Erik Sturegård, Patrick Beckert, Viola Schleusener, Thomas A Kohl, Doris Hillemann, Danesh Moradigaravand, Julian Parkhill, Sharon J Peacock, Stefan Niemann, Christoph Lange, Matthias Merker
Rapid and accurate drug-susceptibility testing (DST) is essential for the treatment of multi- and extensively drug-resistant tuberculosis (M/XDR-TB). We compared the utility of genotypic DST assays with phenotypic DST (pDST) using BACTEC 960 MGIT or Löwenstein-Jensen to construct M/XDR-TB treatment regimens for a cohort of 25 consecutive M/XDR-TB patients and 15 possible anti-TB drugs.Genotypic DST results from Cepheid GeneXpert MTB/RIF (Xpert) and line probe assays (LPAs: Hain GenoType MTBDRplus 2.0 and MTBDRsl 2...
November 13, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29131410/primary-antibiotic-resistance-of-helicobacter-pylori-strains-among-adults-and-children-in-a-tertiary-referral-centre-in-lithuania
#5
Gintare Dargiene, Juozas Kupcinskas, Laimas Jonaitis, Mindaugas Vezbavicius, Edmundas Kadusevicius, Eugenija Kupcinskiene, Tove Havnhoj Frandsen, Ruta Kucinskiene, Limas Kupcinskas, Leif Percival Andersen
The study evaluated primary antibiotic resistance of Helicobacter pylori within the period 2013-2015 and trends of antibiotic consumption over the last decade in Lithuania; 242 adults and 55 children were included in the study. E-tests were performed for amoxicillin, metronidazole, clarithromycin, ciprofloxacin, rifampicin and tetracycline. The presence of H. pylori and clarithromycin resistance was additionally tested by PCR. Helicobacter pylori culture was positive in 67 of 242 (28%) adult and in 12 of 55 (21...
November 13, 2017: APMIS: Acta Pathologica, Microbiologica, et Immunologica Scandinavica
https://www.readbyqxmd.com/read/29129341/erratum-to-rifampicin-lipid-polymer-hybrid-nanoparticles-lipomer-for-enhanced-peyer-s-patch-uptake-international-journal-of-pharmaceutics-532-2017-612-622
#6
Sagar S Bachhav, Vikas D Dighe, Darsheen Kotak, Padma V Devarajan
No abstract text is available yet for this article.
December 20, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/29126464/direct-electrochemical-dna-sensor-based-on-a-new-redox-oligomer-modified-with-ferrocene-and-carboxylic-acid-application-to-the-detection-of-mycobacterium-tuberculosis-mutant-strain
#7
Salma Bizid, Saber Blili, Rym Mlika, Ayoub Haj Said, Hafsa Korri-Youssoufi
A new redox oligomer "oligo-methoxy-phenyl-acetonitrile" (Fc-acid-OMPA) modified with ferrocene groups and carboxylic acids as functional groups in side chains, has been synthesized. The redox indicator has been used for monitoring the electrochemical behavior. The functional groups give the flexibility for direct covalent attachment of biomolecules. The electrochemical properties of the redox oligomer film deposited on gold electrodes have been studied by cyclic voltammetry (CV), which showed a rate of electron transfer of 6...
November 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29124333/assessment-of-hepatotoxicity-of-first-line-anti-tuberculosis-drugs-on-wistar-rats
#8
Radhika Sharma, Ramneek Kaur, Manishi Mukesh, Vijay L Sharma
Adverse drug reactions are inevitable risk factors associated with use of modern medicines. First-line anti-tuberculosis drugs contribute to diverse pathological complications, and hepatotoxicity is one of them. This study investigated the effects of anti-TB drugs in combination (rifampicin [RIF] + isoniazid [INH] + pyrazinamide [PZA]) on Wistar rats. Rats were grouped as control group (saline), toxicant group that was given (30.85 mg/kg b.wt., INH + 61.7 mg/kg b.wt., RIF + 132.65 mg/kg b.wt. PZA in dosage extrapolated from dose that is used in human)...
November 9, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/29122410/non-compliance-with-idsa-guidelines-for-patients-presenting-with-methicillin-susceptible-staphylococcus-aureus-prosthetic-joint-infection-is-a-risk-factor-for-treatment-failure
#9
A Bouaziz, I Uçkay, S Lustig, A Boibieux, D Lew, P Hoffmeyer, P Neyret, C Chidiac, T Ferry
OBJECTIVE: The long-term impact of treatment strategies proposed by the IDSA guidelines for patients presenting with methicillin-susceptible S. aureus (MSSA) prosthetic joint infection (PJI) is not well-known. PATIENTS AND METHODS: Retrospective (2000-2010) cohort study including patients presenting with MSSA hip or knee PJI. A univariate Cox analysis was performed to determine if the non-compliance with IDSA surgical guidelines was a risk factor for treatment failure...
November 6, 2017: Médecine et Maladies Infectieuses
https://www.readbyqxmd.com/read/29120971/a-systematic-review-of-salivary-versus-blood-concentrations-of-anti-tuberculosis-drugs-and-their-potential-for-salivary-therapeutic-drug-monitoring
#10
Simone H J van den Elsen, Lisette M Oostenbrink, Scott K Heysell, Daiki Hira, Daan J Touw, Onno W Akkerman, Mathieu S Bolhuis, Jan-Willem C Alffenaar
BACKGROUND: Therapeutic drug monitoring is useful in the treatment of tuberculosis to assure adequate exposure, minimize antibiotic resistance, and reduce toxicity. Salivary therapeutic drug monitoring could reduce the risks, burden, and costs of blood-based therapeutic drug monitoring. This systematic review compared human pharmacokinetics of anti-tuberculosis drugs in saliva and blood to determine if salivary therapeutic drug monitoring could be a promising alternative. METHODS: On December 2, 2016, PubMed and the Institute for Scientific Information Web of Knowledge were searched for pharmacokinetic studies reporting human salivary and blood concentrations of anti-tuberculosis drugs...
November 8, 2017: Therapeutic Drug Monitoring
https://www.readbyqxmd.com/read/29119867/targeted-macrophages-delivery-of-rifampicin-loaded-lipid-nanoparticles-to-improve-tuberculosis-treatment
#11
Alexandre Cc Vieira, Joana Magalhães, Sónia Rocha, Marcos S Cardoso, Susana G Santos, Margarida Borges, Marina Pinheiro, Salette Reis
AIM: This work aims to develop a mannosylated nanostructured lipid carrier (NLC) loaded with rifampicin to improve tuberculosis treatment. MATERIALS & METHODS: An active targeting strategy was used and the nanoparticles were characterized. Effects on cell viability and the antimycobacterial activity of the nanoformulations were evaluated. RESULTS: The nanoparticles developed exhibited a size of about 315 nm and polydispersity <0.2. The drug encapsulation efficiency was higher than 90% and its release was sensitive to pH...
November 9, 2017: Nanomedicine
https://www.readbyqxmd.com/read/29119205/secretome-profile-analysis-of-multidrug-resistant-monodrug-resistant-and-drug-susceptible-mycobacterium-tuberculosis
#12
Chanyanuch Putim, Narumon Phaonakrop, Janthima Jaresitthikunchai, Ratikorn Gamngoen, Khajornsak Tragoolpua, Sorasak Intorasoot, Usanee Anukool, Chayada Sitthidet Tharincharoen, Ponrut Phunpae, Chatchai Tayapiwatana, Watchara Kasinrerk, Sittiruk Roytrakul, Bordin Butr-Indr
The emergence of drug-resistant tuberculosis has generated great concern in the control of tuberculosis and HIV/TB patients have established severe complications that are difficult to treat. Although, the gold standard of drug-susceptibility testing is highly accurate and efficient, it is time-consuming. Diagnostic biomarkers are, therefore, necessary in discriminating between infection from drug-resistant and drug-susceptible strains. One strategy that aids to effectively control tuberculosis is understanding the function of secreting proteins that mycobacteria use to manipulate the host cellular defenses...
November 8, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/29117990/simultaneous-physiologically-based-pharmacokinetic-pbpk-modeling-of-parent-and-active-metabolites-to-investigate-complex-cyp3a4-drug-drug-interaction-potential-a-case-example-of-midostaurin
#13
Helen Gu, Catherine Dutreix, Sam Rebello, Taoufik Ouatas, Lai Wang, Dung Yu Chun, Heidi J Einolf, Handan He
Midostaurin (PKC412) is being investigated for the treatment of acute myeloid leukemia (AML) and advanced systemic mastocytosis (advSM). It is extensively metabolized by cytochrome P450 (CYP) 3A4 to form 2 major active metabolites, CGP52421 and CGP62221. In vitro and clinical drug-drug interaction (DDI) studies indicated that midostaurin and its metabolites are substrates, reversible and time-dependent inhibitors, and inducers of CYP3A4. A simultaneous pharmacokinetic model of parent and active metabolites was initially developed by incorporating data from in vitro, preclinical, and clinical pharmacokinetic studies in healthy volunteers and in patients with AML or advSM...
November 8, 2017: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/29117342/the-south-african-tuberculosis-care-cascade-estimated-losses-and-methodological-challenges
#14
Pren Naidoo, Grant Theron, Molebogeng X Rangaka, Violet N Chihota, Louise Vaughan, Zameer O Brey, Yogan Pillay
Background: While tuberculosis incidence and mortality are declining in South Africa, meeting the goals of the End TB Strategy requires an invigorated programmatic response informed by accurate data. Enumerating the losses at each step in the care cascade enables appropriate targeting of interventions and resources. Methods: We estimated the tuberculosis burden; the number and proportion of individuals with tuberculosis who accessed tests, had tuberculosis diagnosed, initiated treatment, and successfully completed treatment for all tuberculosis cases, for those with drug-susceptible tuberculosis (including human immunodeficiency virus (HIV)-coinfected cases) and rifampicin-resistant tuberculosis...
November 6, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29116933/first-line-antituberculosis-drugs-disrupt-endocrine-balance-and-induce-ovarian-and-uterine-oxidative-stress-in-rats
#15
Olayinka A Adebayo, Omolola A Adesanoye, Olalekan A Abolaji, Aderemi O Kehinde, Oluwatosin A Adaramoye
BACKGROUND: The first-line antituberculosis (anti-TB) drugs, isoniazid (INH), rifampicin (RIF), ethambutol (EMB), and pyrazinamide (PZA), are effective in the treatment of pulmonary tuberculosis. However, the toxicity of these drugs in the clinical setting limits their use. Here, we evaluated the effects of anti-TB drugs on the reproductive system in female rats. METHODS: Thirty-five female Wistar rats were assigned into five groups of seven animals each. The control group received normal saline, whereas others received INH (5 mg/kg), RIF (10 mg/kg), EMB (15 mg/kg), and PZA (15 mg/kg) through gavage thrice a week for 8 consecutive weeks...
November 8, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/29116638/evolution-of-phenotypic-and-molecular-drug-susceptibility-testing
#16
Daniela M Cirillo, Paolo Miotto, Enrico Tortoli
Drug Resistant Tuberculosis (DRTB) is an emerging problem world-wide. In order to control the disease and decrease the number of cases overtime a prompt diagnosis followed by an appropriate treatment should be provided to patients. Phenotypic DST based on liquid automated culture has greatly reduced the time needed to generate reliable data but has the drawback to be expensive and prone to contamination in the absence of appropriate infrastructures. In the past 10 years molecular biology tools have been developed...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29116637/epidemiology-of-drug-resistant-tuberculosis
#17
Anna S Dean, Helen Cox, Matteo Zignol
As we move into the era of the Sustainable Development Goals (SDGs), the World Health Organization (WHO) has developed the End TB strategy 2016-2035 with a goal to end the global epidemic of tuberculosis (TB) by 2035. Achieving the targets laid out in the Strategy will require strengthening of the whole TB diagnosis and treatment cascade, including improved case detection, the establishment of universal drug susceptibility testing and rapid treatment initiation. An estimated 3.9% of new TB cases and 21% of previously treated cases had rifampicin-resistant (RR) or multidrug-resistant (MDR) TB in 2015...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29110871/prevalence-of-rifampicin-resistant-mycobacterium-tuberculosis-among-human-immunodeficiency-virus-seropositive-patients-and-their-treatment-outcomes
#18
C K Vidyaraj, A Chitra, S Smita, M Muthuraj, S Govindarajan, B Usharani, S Anbazhagi
Multidrug resistant (MDR) and extensively drug resistant tuberculosis (TB) are a threat to the TB control programs in developing countries, and the situation is worsened by the human immunodeficiency virus (HIV) pandemic. This study was performed to correlate treatment outcome with the resistance patterns in HIV-seropositive patients coinfected with pulmonary TB. Sputum specimens were collected from 1643 HIV-seropositive patients and subjected to microscopy and liquid culture for TB. The smear- and culture-positive Mycobacterium tuberculosis isolates were subjected to Genotype MTBDRplus assay version 2...
December 2017: Journal of Epidemiology and Global Health
https://www.readbyqxmd.com/read/29109705/complete-genome-sequence-of-vibrio-campbellii-lmb-29-isolated-from-red-drum-with-four-native-megaplasmids
#19
Jinxin Liu, Zhe Zhao, Yiqing Deng, Yan Shi, Yupeng Liu, Chao Wu, Peng Luo, Chaoqun Hu
Vibrio spp. are the most common pathogens for animals reared in aquaculture. Vibrio campbellii, which is often involved in shrimp, fish and mollusks diseases, is widely distributed in the marine environment worldwide, but our knowledge about its pathogenesis and antimicrobial resistance is very limited. The existence of this knowledge gap is at least partially because that V. campbellii was originally classified as Vibrio harveyi, and the detailed information of its comparative genome analysis to other Vibrio spp...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29109183/mutation-and-suppressor-analysis-of-the-essential-lps-transport-protein-lpta-reveals-strategies-to-overcome-severe-outer-membrane-permeability-defects-in-escherichia-coli
#20
Federica A Falchi, Elisa A Maccagni, Simone Puccio, Clelia Peano, Cristina De Castro, Angelo Palmigiano, Domenico Garozzo, Alessandra M Martorana, Alessandra Polissi, Gianni Dehò, Paola Sperandeo
In Gram-negative bacteria, lipopolysaccharide (LPS) contributes to the robust permeability barrier of the outer membrane (OM), preventing the entry of toxic molecules such as detergents and antibiotics. LPS is transported from the inner membrane (IM) to the OM by the Lpt multiprotein machinery. Defects in LPS transport compromise LPS assembly at the OM and result in increased antibiotic sensitivity. LptA is a key component of the Lpt machine that interacts with the IM protein LptC and chaperons LPS through the periplasm...
November 6, 2017: Journal of Bacteriology
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