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https://www.readbyqxmd.com/read/28917089/the-trehalose-specific-transporter-lpqy-sugabc-is-required-for-antimicrobial-and-anti-biofilm-activity-of-trehalose-analogues-in-mycobacterium-smegmatis
#1
Jeffrey M Wolber, Bailey L Urbanek, Lisa M Meints, Brent F Piligian, Irene C Lopez-Casillas, Kailey M Zochowski, Peter J Woodruff, Benjamin M Swarts
Mycobacteria, including the bacterial pathogen that causes human tuberculosis, possess distinctive pathways for synthesizing and utilizing the non-mammalian disaccharide trehalose. Trehalose metabolism is essential for mycobacterial viability and has been linked to in vitro biofilm formation, which may bear relevance to in vivo drug tolerance. Previous research has shown that some trehalose analogues bearing modifications at the 6-position inhibit growth of various mycobacterial species. In this work, 2-, 5-, and 6-position-modified trehalose analogues were synthesized using our previously reported one-step chemoenzymatic method and shown to inhibit growth and biofilm formation in the two-to three-digit micromolar range in Mycobacterium smegmatis...
August 9, 2017: Carbohydrate Research
https://www.readbyqxmd.com/read/28914953/grafting-of-a-eu-3-tfac-complex-on-to-a-tb-3-metal-organic-framework-for-use-as-a-ratiometric-thermometer
#2
Anna M Kaczmarek, Ying-Ya Liu, Chunhua Wang, Brecht Laforce, Laszlo Vincze, Pascal Van Der Voort, Rik Van Deun
Microrods of [Tb2(bpydc)3(H2O)3]·nDMF (TbMOF) were employed as a platform for grafting a β-diketonate complex of Eu(3+) for the purpose of obtaining ratiometric luminescence thermometer materials. A straightforward post-synthetic functionalization is employed to obtain the TbMOF@Eu_tfac (tfac = trifluoroacetylacetonate) compounds. The emission color of the TbMOF@Eu compounds can be slightly tuned by varying the percentage of the grafted β-diketonate complex of Eu(3+). Also, as shown, the thermometric properties of the material can be tuned by the percentage of grafted β-diketonate complex of Eu(3+)...
September 15, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28914808/structural-and-dynamics-perspectives-on-the-binding-of-substrate-and-inhibitors-in-mycobacterium-tuberculosis-dhfr
#3
Pimonluck Sittikornpaiboon, Pisanu Toochinda, Luckhana Lawtrakul
Dihydrofolate reductase (DHFR), an essential enzyme in the folate pathway, is a potential target for new anti-tuberculosis drugs. Fifteen crystal structures of Mycobacterium tuberculosis DHFR complexed with NADPH and various inhibitors are available in the RCSB Protein Data Bank, but none of them is a substrate binding structure. Therefore, we performed molecular dynamics simulations on ternary complexes of M. tuberculosis DHFR:NADPH with a substrate (dihydrofolate) and each of three competitive inhibitors the in 2,4-diaminopyrimidine series (P1, P157, and P169), in order to gain insight into the inhibition-mechanism of DHFR in the folate pathway...
September 15, 2017: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/28911362/assessment-of-the-quality-of-anti-tuberculosis-medicines-in-almaty-kazakhstan-2014
#4
D Nabirova, G Schmid, R Yusupova, M Kantarbayeva, S I Ismailov, D Moffett, R W O Jähnke, J P Nuorti
SETTING: In 2009, the World Health Organization (WHO) conducted a survey of the quality of four anti-tuberculosis drugs in the former Soviet Union countries. Kazakhstan had the highest proportion of substandard drugs. OBJECTIVE: To assess the quality of anti-tuberculosis drugs used in Kazakhstan in 2014. DESIGN: Fourteen anti-tuberculosis drugs from the Almaty Interdistrict TB Dispensary were randomly selected and screened for quality using Global Pharma Health Fund Minilab™ testing...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911361/detecting-mycobacterium-tuberculosis-using-the-loop-mediated-isothermal-amplification-test-in-south-africa
#5
S Reddy, S Ntoyanto, Y Sakadavan, T Reddy, S Mahomed, M Dlamini, B Spooner, G Ramjee, A Coutsoudis, N Ngomane, K Naidoo, K Mlisana, P Kiepiela
SETTING: In South Africa, KwaZulu-Natal is the epicentre of the human immunodeficiency virus (HIV) epidemic, where approximately 70% of people with tuberculosis (TB) are co-infected with HIV. Undiagnosed TB contributes to high mortality in HIV-infected patients. Delays in diagnosing TB and treatment initiation result in prolonged transmission and increased infectiousness. OBJECTIVE: To evaluate the LoopampTM MTBC Detection kit (TB-LAMP; based on the loop-mediated isothermal amplification assay), smear microscopy and Xpert test with the gold standard of mycobacterial culture...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911357/pulmonary-tuberculosis-diagnostic-practices-among-people-living-with-the-human-immunodeficiency-virus-in-lesotho
#6
D E O'Connor, K Frederix, S Saito, L B Maama, Y Hirsch-Moverman, B Pitt, E Hayes-Larson, L Lebelo, M Shale, A A Howard
SETTING: Twelve health facilities in Berea District, Lesotho, that participated in the Start TB Patients on ART and Retain on Treatment (START) Study, a mixed-methods cluster-randomized trial evaluating a combination intervention package to improve early initiation of antiretroviral therapy (ART) and anti-tuberculosis treatment success among patients with tuberculosis (TB) and human immunodeficiency virus (HIV). OBJECTIVE: To assess TB and HIV diagnostic practices among TB-HIV patients...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911356/high-completion-rates-of-isoniazid-preventive-therapy-among-persons-living-with-hiv-in-swaziland
#7
L V Adams, N Mahlalela, E A Talbot, M Pasipamire, S Ginindza, M Calnan, S Haumba
SETTING: Five human immunodeficiency virus (HIV) care facilities in Swaziland. OBJECTIVE: To assess adherence and treatment completion of a 6-month course of isoniazid preventive therapy (IPT) provided to HIV-infected patients through a self-selected model of facility-based, community-based or peer-supported IPT delivery coordinated with antiretroviral refills. DESIGN: Prospective cohort study. RESULTS: Between February and August 2015, we enrolled 908 patients, with follow-up until February 2016...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911354/drug-resistance-patterns-among-extra-pulmonary-tuberculosis-cases-in-a-tertiary-care-centre-in-north-india
#8
S K Sharma, J Chaubey, B K Singh, R Sharma, A Mittal, A Sharma
BACKGROUND: xtra-pulmonary tuberculosis (EPTB) is a growing public health concern, and data on drug resistance are limited. MATERIAL AND METHODS: Specimens from 2468 clinically diagnosed EPTB patients received at the Intermediate Reference Laboratory (IRL) of a tertiary centre in India were subjected to Ziehl-Neelsen staining, Xpert® MTB/RIF testing, liquid culture and drug susceptibility testing (DST) using automated BACTEC MGIT™ 960™. Line-probe assay (LPA) was performed on all culture-positive isolates...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911350/applying-the-care-group-model-to-tuberculosis-control-findings-from-a-community-based-project-in-mozambique
#9
A Brown, P Ernst, A Cambule, M Morrow, D Dortzbach, J E Golub, H B Perry
BACKGROUND: We describe the effectiveness of an innovative community-based social mobilization approach called Care Groups to improve the effectiveness of the national tuberculosis (TB) program by increasing TB testing and improving treatment outcomes in six districts of rural Mozambique. METHODS: The Care Group approach, which was implemented in a population of 218 191, enabled a facilitator to meet every 6 months with 10-12 community health volunteers (forming a Care Group) to share key TB messages and then for them to convey these messages over the subsequent 6 months to 10-12 households...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911349/tuberculosis-human-rights-and-ethics-considerations-along-the-route-of-a-highly-vulnerable-migrant-from-sub-saharan-africa-to-europe
#10
V Wild, D Jaff, N S Shah, M Frick
Migrant health is a critical public health issue, and in many countries attention to this topic has focused on the link between migration and communicable diseases, including tuberculosis (TB). When creating public health policies to address the complex challenges posed by TB and migration, countries should focus these policies on evidence, ethics, and human rights. This paper traces a commonly used migration route from sub-Saharan Africa to Europe, identifying situations at each stage in which human rights and ethical values might be affected in relation to TB care...
October 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28911125/differences-in-survival-among-adults-with-hiv-associated-kaposi-s-sarcoma-during-routine-hiv-treatment-initiation-in-zomba-district-malawi-a-retrospective-cohort-analysis
#11
Emmanuel Singogo, Thomas J Keegan, Peter J Diggle, Monique van Lettow, Alfred Matengeni, Joep J van Oosterhout, Sumeet Sodhi, Martias Joshua, Benjamin M Taylor
Background: The HIV epidemic is a major public health concern throughout Africa. Malawi is one of the worst affected countries in sub-Saharan Africa with a 2014 national HIV prevalence currently estimated at 10% (9.3-10.8%) by UNAIDS. Study reports, largely in the African setting comparing outcomes in HIV patients with and without Kaposi's sarcoma (KS) indicate poor prognosis and poor health outcomes amongst HIV+KS patients. Understanding the mortality risk in this patient group could help improve patient management and care...
September 1, 2017: International Health
https://www.readbyqxmd.com/read/28911035/evaluation-of-pe_pgrs33-as-a-potential-surface-target-for-humoral-responses-against-mycobacterium-tuberculosis
#12
Mariachiara Minerva, Flavio De Maio, Serena Camassa, Basem Battah, Palucci Ivana, Riccardo Manganelli, Maurizio Sanguinetti, Michela Sali, Giovanni Delogu
Mycobacterium tuberculosis (Mtb) PE_PGRS33 is a surface-exposed protein that was shown to interact with Toll-like receptor 2 on host macrophages to induce inflammatory signals and promote entry in macrophages. In this study, we investigated PE_PGRS33 as a potential target of a humoral response aimed at hampering key processes in tuberculosis pathogenesis. PE_PGRS33 protein was successfully expressed and purified under native condition in Escherichia coli. The purified protein retained its native functional and biological properties, showing the ability to elicit proinflammatory signals in murine and human macrophages...
November 30, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28911030/whole-genome-sequencing-identifies-nosocomial-transmission-of-extra-pulmonary-m-tuberculosis-response
#13
T M Walker, D W Crook, T E A Peto, C P Conlon
No abstract text is available yet for this article.
September 1, 2017: QJM: Monthly Journal of the Association of Physicians
https://www.readbyqxmd.com/read/28910983/quantitative-proteomic-analysis-of-host-responses-triggered-by-mycobacterium-tuberculosis-infection-in-human-macrophage-cells
#14
Hua Li, Sha Wei, Yuan Fang, Min Li, Xia Li, Zhe Li, Jibin Zhang, Guofeng Zhu, Chuanyou Li, Lijun Bi, Guimin Zhang, Dianbing Wang, Xian-En Zhang
Macrophages are primary host of Mycobacterium tuberculosis (M.tb) and the central effector of in vivo innate immune responses against bacteria. Though the interaction between macrophages and mycobacteria has been widely investigated, the molecular mechanisms of M.tb pathogenesis in macrophages are still not clear. In this work, we investigated the altered protein expression profiles of macrophages after virulent H37Rv strain and avirulent H37Ra strain infection by tandem mass tag-based quantitative proteomics...
September 1, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/28910939/-genotyping-and-drug-susceptibility-of-mycobacterium-tuberculosis-isolated-in-changping-district-in-beijing-2011-2015
#15
Z G Zhang, J F Wu, L Wang, L Q Wang, L Han, S B Ma, T J Gao
Objective: To understand the genotype distribution of Mycobacterium tuberculosis and the drug susceptibility of M. tuberculosis with different genotypes in Changping district of Beijing and evaluate the application of genotyping of M. tuberculosis in local tuberculosis (TB) prevention and control. Methods: A total of 1 099 M. tuberculosis strains isolated in Changping from 2011 to 2015 were used. Spoligotyping and 12-locus VNTR recommended by Gao were used for the genotyping of these isolates. In addition, the susceptibility of the M...
September 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28910933/-visual-spatial-and-temporal-characteristics-related-to-infectious-tuberculosis-epidemics-in-guangxi-zhuang-autonomous-region-2012-2015
#16
M Lin, Z Z Cui, D W Lin, D B Liang, M Y Huang, H B Su, X Y Tang
Objective: To study the spatial and temporal mode of infectious TB transmission in Guangxi Zhuang Autonomous Region (Guangxi). Methods: Data related to infectious TB case (Include smear and/or culture positive patients) in Guangxi were collected from the National Notifiable Disease Reported System (NNDRS) from 2010 to 2015. Spatial-temporal analysis and prediction were performed by SaTScan 7.0.2, GeoDa 1.8.12, R program v 3.3.1 and SPSS 19.0 software, using the time series model, Moran's I global and local spatial autocorrelation (Empirical Bayes adjustment)...
September 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/28905401/mycothiol-acetyltransferase-rv0819-of-mycobacterium-tuberculosis-is-a-potential-biomarker-for-direct-diagnosis-of-tuberculosis-using-patient-serum-specimens
#17
H Zeitoun, M Bahey-El-Din, M A Kassem, H M Aboushleib
Mycobacterium tuberculosis infection constitutes a global threat that results in significant morbidity and mortality worldwide. Efficient and early diagnosis of tuberculosis (TB) is of paramount importance for successful treatment. The aim of the current study is to investigate the mycobacterial mycothiol acetyltransferase Rv0819 as a potential novel biomarker for diagnosis of active TB infection. The gene encoding Rv0819 was cloned and successfully expressed in Escherichia coli. The recombinant Rv0819 was purified using metal affinity chromatography and was used to raise murine polyclonal antibodies against Rv0819...
September 14, 2017: Letters in Applied Microbiology
https://www.readbyqxmd.com/read/28904673/mutations-in-rpob-and-katg-genes-of-multidrug-resistant-mycobacterium-tuberculosis-undetectable-using-genotyping-diagnostic-methods
#18
Faustinos Tatenda Takawira, Racheal Shamiso Dube Mandishora, Zephaniah Dhlamini, Ellen Munemo, Babill Stray-Pedersen
INTRODUCTION: Tuberculosis remains the leading causes of death worldwide with frequencies of mutations in rifampicin and isoniazid resistant Mycobacterium tuberculosis isolates varying according to geographical location. There is limited information in Zimbabwe on specific antibiotic resistance gene mutation patterns in MTB and hence, increased rate of discordant results and mortality due to inappropriate antibiotic prescriptions. The rpoB and katG genes molecular markers are used for detecting rifampicin and isoniazid resistance respectively...
2017: Pan African Medical Journal
https://www.readbyqxmd.com/read/28904186/stool-culture-for-the-diagnosis-of-pulmonary-tuberculosis-in-children
#19
Elisabetta Walters, Anne-Marie Demers, Marieke M van der Zalm, Andrew Whitelaw, Megan Palmer, Corné Bosch, Heather R Draper, Robert P Gie, Anneke C Hesseling
Bacteriological confirmation of Mycobacterium tuberculosis is achieved in the minority of young children with tuberculosis (TB), as specimen collection is resource-intensive and respiratory secretions are mostly paucibacillary, leading to limited sensitivity of available diagnostic tests. Although molecular tests are increasingly available globally, mycobacterial culture remains the gold standard for diagnosis and determination of drug susceptibility and is more sensitive than molecular methods for paucibacillary TB...
September 13, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28903800/predicting-treatment-failure-death-and-drug-resistance-using-a-computed-risk-score-among-newly-diagnosed-tb-patients-in-tamaulipas-mexico
#20
B E Abdelbary, M Garcia-Viveros, H Ramirez-Oropesa, M H Rahbar, B I Restrepo
The purpose of this study was to develop a method for identifying newly diagnosed tuberculosis (TB) patients at risk for TB adverse events in Tamaulipas, Mexico. Surveillance data between 2006 and 2013 (8431 subjects) was used to develop risk scores based on predictive modelling. The final models revealed that TB patients failing their treatment regimen were more likely to have at most a primary school education, multi-drug resistance (MDR)-TB, and few to moderate bacilli on acid-fast bacilli smear. TB patients who died were more likely to be older males with MDR-TB, HIV, malnutrition, and reporting excessive alcohol use...
September 14, 2017: Epidemiology and Infection
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