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https://www.readbyqxmd.com/read/28739784/assessment-of-bactericidal-drug-activity-and-treatment-outcome-in-a-mouse-tuberculosis-model-using-a-clinical-beijing-strain
#1
Bas C Mourik, Gerjo J de Knegt, Annelies Verbon, Johan W Mouton, Hannelore I Bax, Jurriaan E M de Steenwinkel
Objectives:Mycobacterium tuberculosis Beijing strains are associated with lower treatment success rates in tuberculosis patients. In contrast, laboratory strains such as H37Rv are often used in preclinical tuberculosis models. Therefore, we explored the impact of using a clinical Beijing strain on treatment outcome in our mouse tuberculosis model. Additionally, the predictive value of bactericidal activity on treatment outcome was assessed.Methods: BALB/c mice were infected with a Beijing strain and treated with one of ten different combinations of conventional anti-TB drugs...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739782/co-administration-of-allopurinol-to-increase-anti-mycobacterial-efficacy-of-pyrazinamide-evaluation-in-a-whole-blood-bactericidal-activity-model
#2
Claire M Naftalin, Rupangi Verma, Meera Gurumurthy, Qingshu Lu, Matthew Zimmerman, Benjamin Chaik Meng Yeo, Kin Hup Tan, Wenwei Lin, Buduo Yu, Véronique Dartois, Nicholas I Paton
Co-administering pyrazinamide (PZA) with the xanthine oxidase inhibitor, allopurinol, increases systemic levels of the active metabolite, pyrazinoic acid (POA), but effects on bactericidal activity against tuberculosis are unknown. We randomized healthy volunteers to take a single dose of PZA (either 10mg/kg or 25mg/kg) and the same dose 7 days later co-administered with allopurinol (100mg daily, 2 days before to 1 day after PZA dose). Blood was drawn at intervals to 48 hours after each PZA dose and drug levels were measured using liquid chromatography-tandem mass spectrometry...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739779/in-vitro-drug-susceptibility-of-bedaquiline-delamanid-linezolid-clofazimine-moxifloxacin-and-gatifloxacin-against-extensively-drug-resistant-tuberculosis-from-beijing-china
#3
Yu Pang, Zhaojing Zong, Fengmin Huo, Wei Jing, Yifeng Ma, Lingling Dong, Yunxu Li, Liping Zhao, Yuhong Fu, Hairong Huang
Extensively drug-resistant tuberculosis (XDR-TB) is a deadly form of TB that can be incurable due to its extreme drug resistance. In this study, we aimed to explore in vitro drug susceptibility of bedaquiline (BDQ), delamanid (DMD), linezolid (LZD), clofazimine (CLO), moxifloxacin (MXF), and gatifloxacin (GAT) against 90 XDR-TB strains isolated from patients in China. We also described the genetic characteristics of XDR-TB isolates with acquired drug resistance. Resistance to MFX, GAT, LZD, CLO, DMD and BDQ was found in 82 (91...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28739353/incidence-of-tuberculosis-among-patients-with-rheumatoid-arthritis-using-tnf-blockers-in-brazil-data-from-the-brazilian-registry-of-biological-therapies-in-rheumatic-diseases-registro-brasileiro-de-monitora%C3%A3-%C3%A3-o-de-terapias-biol%C3%A3-gicas-biobadabrasil
#4
Claudia Leiko Yonekura, Rene Donizeti Ribeiro Oliveira, David C Titton, Roberto Ranza, Aline Ranzolin, André L Hayata, Ângela Duarte, Inês G Silveira, Hellen M da S de Carvalho, Júlio C Bertacini de Moraes, Mirhelen Mendes de Abreu, Valéria Valim, Washington Bianchi, Claiton Viegas Brenol, Ivanio A Pereira, Izaias Costa, José C Macieira, José R S Miranda, Luiz S Guedes-Barbosa, Manoel B Bertolo, Maria Fátima Lobato da C Sauma, Marília B G Silva, Marlene Freire, Morton A Scheinberg, Roberto A Toledo, Sheila K F Oliveira, Vander Fernandes, Marcelo M Pinheiro, Glaucio Castro, Walber Pinto Vieira, Cesar Emile Baaklini, Antonio Ruffino-Netto, Geraldo da Rocha Castelar Pinheiro, Ieda Maria Magalhães Laurindo, Paulo Louzada-Junior
OBJECTIVES: To assess the incidence of tuberculosis and to screen for latent tuberculosis infection among Brazilians with rheumatoid arthritis using biologics in clinical practice. PATIENTS AND METHODS: This cohort study used data from the Brazilian Registry of Biological Therapies in Rheumatic Diseases (Registro Brasileiro de Monitoração de Terapias Biológicas - BiobadaBrasil), from 01/2009 to 05/2013, encompassing 1552 treatments, including 415 with only synthetic disease-modifying anti-rheumatic drugs, 942 synthetic DMARDs combined with anti-tumor necrosis factor (etanercept, infliximab, adalimumab) and 195 synthetic DMARDs combined with other biologics (abatacept, rituximab and tocilizumab)...
July 21, 2017: Revista Brasileira de Reumatologia
https://www.readbyqxmd.com/read/28739225/distribution-scheme-of-anti-tuberculosis-drug-resistance-among-hiv-patients-in-a-referral-center-over-10-years
#5
Parvaneh Baghaei, Payam Tabarsi, Afshin Moniri, Majid Marjani, Parissa Farnia, Sayena Jabbehdari, Ali Akbar Velayati
OBJECTIVES: Anti-tuberculosis (TB) drug resistance is increasing among TB patients globally, particularly, in those that are human immunodeficiency virus (HIV) positive. The aim of this study was to determine the pattern of anti-TB drug resistance in these patients in an effort to improve successful treatment outcomes with a proper regimen. METHODS: A cross-sectional study was conducted on adult TB-HIV patients from 2005 to 2015. The pattern of anti-TB drugs resistance was evaluated among HIV positive patients with and without a history of TB treatment...
July 21, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28736556/ras-signaling-inhibitors-attenuate-disease-in-adjuvant-induced-arthritis-via-targeting-pathogenic-antigen-specific-th17-type-cells
#6
Morad Zayoud, Victoria Marcu-Malina, Einav Vax, Jasmine Jacob-Hirsch, Galit Elad-Sfadia, Iris Barshack, Yoel Kloog, Itamar Goldstein
The Ras family of GTPases plays an important role in signaling nodes downstream to T cell receptor and CD28 activation, potentially lowering the threshold for T-cell receptor activation by autoantigens. Somatic mutation in NRAS or KRAS may cause a rare autoimmune disorder coupled with abnormal expansion of lymphocytes. T cells from rheumatoid arthritis (RA) patients show excessive activation of Ras/MEK/ERK pathway. The small molecule farnesylthiosalicylic acid (FTS) interferes with the interaction between Ras GTPases and their prenyl-binding chaperones to inhibit proper plasma membrane localization...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28735047/sesamol-exhibits-potent-antimycobacterial-activity-underlying-mechanisms-and-impact-on-virulence-traits
#7
Sandeep Hans, Sharda Sharma, Saif Hameed, Zeeshan Fatima
OBJECTIVES: Novel strategies to overcome multidrug resistance (MDR) in Tuberculosis (TB) still remain a concern. Usage of natural compounds nowadays to surmount the increasing burden of MDR-TB has shown promising results. The aim of this study was to evaluate the antimycobacterial potential of sesamol (Ses) a natural phenolic compound against Mycobacterium smegmatis, a surrogate for MTB and its underlying mechanism of action along with its effect on mycobacterial virulence traits. METHODS: Cell surface phenotypes were estimated microscopically and spectrophotometrically respectively...
July 19, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28733601/anti-tubercular-activity-of-pyrazinamide-is-independent-of-trans-translation-and-rpsa
#8
Nicholas A Dillon, Nicholas D Peterson, Heather A Feaga, Kenneth C Keiler, Anthony D Baughn
Pyrazinamide (PZA) is a first line anti-tubercular drug for which the mechanism of action remains unresolved. Recently, it was proposed that the active form of PZA, pyrazinoic acid (POA), disrupts the ribosome rescue process of trans-translation in Mycobacterium tuberculosis. This model suggested that POA binds within the carboxy-terminal domain of ribosomal protein S1 (RpsA) and inhibits trans-translation leading to accumulation of stalled ribosomes. Here, we demonstrate that M. tuberculosis RpsA interacts with single stranded RNA, but not with POA...
July 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28730751/tuberculosis-and-biologics-in-rheumatology-india-a-special-situation
#9
REVIEW
Rohini Handa, Sundeep Upadhyaya, Sanjiv Kapoor, Ramesh Jois, Bimlesh D Pandey, Anuj K Bhatnagar, Ashwani Khanna, Vishal Goyal, Kamal Kumar
India has a huge patient burden of rheumatic diseases (RDs) including rheumatoid arthritis. The use of biologics has transformed the treatment paradigm for RD; however, biologic treatment-related infections (especially tuberculosis [TB]) are an area of potential concern for TB-endemic nations like India. Anti-tumor necrosis factor (TNF) therapy impairs the physiological TNF-mediated signaling and may cause reactivation and dissemination of latent TB infection (LTBI). Careful screening is, thus, crucial in RD patients who are about to commence anti-TNF treatment...
July 21, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/28727774/inhibitors-of-mycobacterium-marinum-virulence-identified-in-a-dictyostelium-discoideum-host-model
#10
Hajer Ouertatani-Sakouhi, Sébastien Kicka, Gianpaolo Chiriano, Christopher F Harrison, Hubert Hilbi, Leonardo Scapozza, Thierry Soldati, Pierre Cosson
Tuberculosis remains one of the major threats to public health worldwide. Given the prevalence of multi drug resistance (MDR) in Mycobacterium tuberculosis strains, there is a strong need to develop new anti-mycobacterial drugs with modes of action distinct from classical antibiotics. Inhibitors of mycobacterial virulence might target new molecular processes and may represent a potential new therapeutic alternative. In this study, we used a Dictyostelium discoideum host model to assess virulence of Mycobacterium marinum and to identify compounds inhibiting mycobacterial virulence...
2017: PloS One
https://www.readbyqxmd.com/read/28725053/cyclic-di-gmp-regulates-mycobacterium-tuberculosis-resistance-to-ethionamide
#11
Hai-Nan Zhang, Zhao-Wei Xu, He-Wei Jiang, Fan-Lin Wu, Xiang He, Yin Liu, Shu-Juan Guo, Yang Li, Li-Jun Bi, Jiao-Yu Deng, Xian-En Zhang, Sheng-Ce Tao
Tuberculosis is still on the top of infectious diseases list on both mobility and mortality, especially due to drug-resistance of Mycobacterium tuberculosis (M.tb). Ethionamide (ETH) is one of effective second line anti-TB drugs, a synthetic compound similar to isoniazid (INH) structurally, with existing severe problem of ETH resistance. ETH is a prodrug, which is activated by Etha inside M.tb, and etha is transcriptionally repressed by Ethr. We found that c-di-GMP could bind Ethr, enhanced the binding of Ethr to the promoter of etha, and then repressed the transcription of etha, thus caused resistance of M...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28721972/ultrasound-imaging-features-of-isolated-pancreatic-tuberculosis
#12
Yi Dong, Christian Jürgensen, Rajesh Puri, Mirko D'Onofrio, Michael Hocke, Wen-Ping Wang, Nathan Atkinson, Malay Sharma, Christoph F Dietrich
BACKGROUND AND OBJECTIVES: Isolated pancreatic tuberculosis (PTB) is extremely rare worldwide. The purpose of this multicenter retrospective study is to analyze imaging features of histologically confirmed isolated PTB in order to determine the diagnostic features of the new methods contrast enhanced ultrasound (CEUS), ultrasound elastography and contrast enhanced endoscopic ultrasound (CE-EUS). PATIENTS AND METHODS: We report on a retrospective data collection of 12 cases of PTB confirmed by histology or cytology...
July 19, 2017: Endoscopic Ultrasound
https://www.readbyqxmd.com/read/28720136/bilateral-multiple-pulmonary-artery-aneurysms-associated-with-cavitary-pulmonary-tuberculosis-a-case-report
#13
Pedro Pallangyo, Frederick Lyimo, Smita Bhalia, Hilda Makungu, Bashir Nyangasa, Flora Lwakatare, Pal Suranyi, Mohamed Janabi
BACKGROUND: Pulmonary artery aneurysms constitute <1% of aneurysms occurring in the thoracic cavity. Congenital cardiac defects are responsible for the majority (>50%) of cases, however, pulmonary artery aneurysm is a rare sequelae of pulmonary tuberculosis reported in about 5% of patients with chronic cavitary tuberculosis on autopsy. The natural history of this potentially fatal condition remains poorly understood and guidelines for optimal management are controversial. CASE PRESENTATION: A 24-year-old man, a nursing student of African descent, was referred to us from an up-country regional hospital with a 4-week history of recurrent episodes of breathlessness, awareness of heartbeats and coughing blood 3 weeks after completing a 6-month course of anti-tuberculosis drugs...
July 19, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28716625/a-comparative-study-of-phenotypic-and-genotypic-first-and-second-line-drug-resistance-testing-of-mycobacterium-tuberculosis
#14
Fatemeh Sakhaee, Morteza Ghazanfari, Nayereh Ebrahimzadeh, Farzam Vaziri, Fatemeh Rahimi Jamnani, Mehdi Davari, Safoora Gharibzadeh, Fatemeh Hemati Mandjin, Abolfazl Fateh, Seyed Davar Siadat
This study aimed to evaluate the frequency of resistance to first- and second-line drugs using phenotypic and genotypic methods and its correlation with resistance-linked mutations in Mycobacterium tuberculosis (M. tb) isolated in Iran. Three different methods, including the indirect proportion method(PM), direct and indirect nitrate reductase assay(NRA), and direct sequencing were used to assess drug resistance. In this study, sensitivity, specificity, agreement, costs, and turnaround time of these methods were compared in 395 smear positive isolates...
July 15, 2017: Biologicals: Journal of the International Association of Biological Standardization
https://www.readbyqxmd.com/read/28715978/the-role-of-efflux-pumps-in-tuberculosis-treatment-and-their-promise-as-a-target-in-drug-development-unraveling-the-black-box
#15
Lindsey H M Te Brake, Gerjo J de Knegt, Jurriaan E de Steenwinkel, Teunis J P van Dam, David M Burger, Frans G M Russel, Reinout van Crevel, Jan B Koenderink, Rob E Aarnoutse
Insight into drug transport mechanisms is highly relevant to the efficacious treatment of tuberculosis (TB). Major problems in TB treatment are related to the transport of antituberculosis (anti-TB) drugs across human and mycobacterial membranes, affecting the concentrations of these drugs systemically and locally. Firstly, transporters located in the intestines, liver, and kidneys all determine the pharmacokinetics and pharmacodynamics of anti-TB drugs, with a high risk of drug-drug interactions in the setting of concurrent use of antimycobacterial, antiretroviral, and antidiabetic agents...
July 17, 2017: Annual Review of Pharmacology and Toxicology
https://www.readbyqxmd.com/read/28713389/non-steroidal-anti-inflammatory-drugs-as-host-directed-therapy-for-tuberculosis-a-systematic-review
#16
REVIEW
Vera M Kroesen, Matthias I Gröschel, Neil Martinson, Alimuddin Zumla, Markus Maeurer, Tjip S van der Werf, Cristina Vilaplana
Lengthy, antimicrobial therapy targeting the pathogen is the mainstay of conventional tuberculosis treatment, complicated by emerging drug resistances. Host-directed therapies, including non-steroidal anti-inflammatory drugs (NSAIDs), in contrast, target host factors to mitigate disease severity. In the present Systematic Review, we investigate whether NSAIDs display any effects as therapy of TB and discuss possible mechanisms of action of NSAIDs as adjunctive therapy of TB. Ten studies, seven preclinical studies in mice and three clinical trials, were included and systematically reviewed...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28711989/striking-the-right-immunological-balance-prevents-progression-of-tuberculosis
#17
REVIEW
Shachi Pranjal Vyas, Ritobrata Goswami
INTRODUCTION: Tuberculosis (TB) caused by infection with Mycobacterium tuberculosis (Mtb) is a major burden for human health worldwide. Current standard treatments for TB require prolonged administration of antimycobacterial drugs leading to exaggerated inflammation and tissue damage. This can result in the reactivation of latent TB culminating in TB progression. Thus, there is an unmet need to develop therapies that would shorten the duration of anti-TB treatment and to induce optimal protective immune responses to control the spread of mycobacterial infection with minimal lung pathology...
July 15, 2017: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/28711677/extended-spectrum-of-antibiotic-susceptibility-for-tuberculosis-djibouti
#18
Fériel Bouzid, Hélène Astier, Djaltou Aboubaker Osman, Emilie Javelle, Mohamed Osman Hassan, Fabrice Simon, Eric Garnotel, Michel Drancourt
The Horn of Africa suffers from a high prevalence of tuberculosis which is reported to be partly driven by multi-drug resistant (MDR) Mycobacterium tuberculosis strictu sensu strains. We conducted a prospective study to investigate M. tuberculosis complex species causing tuberculosis in Djibouti; along with their in vitro susceptibility to standard anti-tuberculous antibiotics, in addition to clofazimine, minocycline, chloramphenicol and sulfadiazine. Among the 118 mycobacteria isolates from 118 successive patients with suspected pulmonary tuberculosis, 111 strains of M...
July 12, 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28710351/combination-therapy-for-tuberculosis-treatment-pulmonary-administration-of-ethionamide-and-booster-co-loaded-nanoparticles
#19
Joana Costa-Gouveia, Elisabetta Pancani, Samuel Jouny, Arnaud Machelart, Vincent Delorme, Giuseppina Salzano, Raffaella Iantomasi, Catherine Piveteau, Christophe J Queval, Ok-Ryul Song, Marion Flipo, Benoit Deprez, Jean-Paul Saint-André, José Hureaux, Laleh Majlessi, Nicolas Willand, Alain Baulard, Priscille Brodin, Ruxandra Gref
Tuberculosis (TB) is a leading infectious cause of death worldwide. The use of ethionamide (ETH), a main second line anti-TB drug, is hampered by its severe side effects. Recently discovered "booster" molecules strongly increase the ETH efficacy, opening new perspectives to improve the current clinical outcome of drug-resistant TB. To investigate the simultaneous delivery of ETH and its booster BDM41906 in the lungs, we co-encapsulated these compounds in biodegradable polymeric nanoparticles (NPs), overcoming the bottlenecks inherent to the strong tendency of ETH to crystallize and the limited water solubility of this Booster...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710015/bactericidal-impact-of-ag-zno-and-mixed-agzno-colloidal-nanoparticles-on-h37rv-mycobacterium-tuberculosis-phagocytized-by-thp-1%C3%A2-cell-lines
#20
Alireza Jafari, Nader Mosavari, Farahnaz Movahedzadeh, Saeedeh Jafari Nodooshan, Roya Safarkar, Rossella Moro, Morteza Kamalzadeh, Ali Majidpour, Mina Boustanshenas, Tahereh Mosavi
The purpose of this research project was to infection of human macrophages (THP-1) cell lines by H37Rv strain of Mycobacterium tuberculosis (H37RvMTB) and find out the ratio/dilution of mixture silver (Ag NPs) and zinc oxide nanoparticles (ZnO NPs) whose ability to eliminate phagocytized bacteria compared to rifampicin. The colloidal Ag NPs and ZnO NPs were synthesized and their characteristics were evaluated. The THP-1 cell lines were infected with different concentration of H37RvMTB. Next, the infected cells were treated with different ratios/dilutions of Ag NPs, ZnO NPs and rifampicin...
July 11, 2017: Microbial Pathogenesis
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