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https://www.readbyqxmd.com/read/28214557/quadruple-first-line-drug-resistance-in-mycobacterium-tuberculosis-in-vietnam-what-can-we-learn-from-genes
#1
Huy Quang Nguyen, Nhung Viet Nguyen, Lucie Contamin, Thanh Hoa Thi Tran, Thuong Thi Vu, Hung Van Nguyen, Ngoc Lan Thi Nguyen, Son Thai Nguyen, Anh Duc Dang, Anne-Laure Bañuls, Van Anh Thi Nguyen
In Vietnam, a country with high tuberculosis (137/100.000 population) and multidrug-resistant (MDR)-TB burdens (7.8/100.000 population), little is known about the molecular signatures of drug resistance in general and more particularly of second line drug (SLD) resistance. This study is specifically focused on Mycobacterium tuberculosis isolates resistant to four first-line drugs (FLDs) that make TB much more difficult to treat. The aim is to determine the proportion of SLD resistance in these quadruple drug resistant isolates and the genetic determinants linked to drug resistance to better understand the genetic processes leading to quadruple and extremely drug resistance (XDR)...
February 15, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28210505/nanotechnology-based-approach-in-tuberculosis-treatment
#2
REVIEW
Mohammad Nasiruddin, Md Kausar Neyaz, Shilpi Das
Tuberculosis, commonly known as TB, is the second most fatal infectious disease after AIDS, caused by bacterium called Mycobacterium tuberculosis. Prolonged treatment, high pill burden, low compliance, and stiff administration schedules are factors that are responsible for emergence of MDR and XDR cases of tuberculosis. Till date, only BCG vaccine is available which is ineffective against adult pulmonary TB, which is the most common form of disease. Various unique antibodies have been developed to overcome drug resistance, reduce the treatment regimen, and elevate the compliance to treatment...
2017: Tuberculosis Research and Treatment
https://www.readbyqxmd.com/read/28202091/isolation-unit-for-multidrug-resistant-tuberculosis-patients-in-a-low-endemic-country-a-step-towards-the-world-health-organization-end-tb-strategy
#3
M C Payen, J P VAN Vooren, O Vandenberg, N Clumeck, S DE Wit
Tuberculosis (TB) remains a threat to public health and is the second cause of death due to a single infectious agent after HIV/AIDS. The worldwide distribution of TB is heterogeneous. The incidence is decreasing in most high-income regions, but the situation remains worrying in many parts of the world. The emergence of Mycobacterium tuberculosis strains resistant to key agents used in treatment (rifampin and isoniazid) contributes to TB transmission around the world. To achieve TB elimination, both high and low endemic countries must upscale their efforts to decrease disease transmission and improve cure rates...
February 16, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28178199/combined-use-of-delamanid-and-bedaquiline-to-treat-multidrug-resistant-and-extensively-drug-resistant-tuberculosis-a-systematic-review
#4
REVIEW
Giovanni Battista Migliori, Emanuele Pontali, Giovanni Sotgiu, Rosella Centis, Lia D'Ambrosio, Simon Tiberi, Marina Tadolini, Susanna Esposito
The new drugs delamanid and bedaquiline are increasingly being used to treat multidrug-resistant (MDR-) and extensively drug-resistant tuberculosis (XDR-TB). The World Health Organization, based on lack of evidence, recommends their use under specific conditions and not in combination. No systematic review has yet evaluated the efficacy, safety, and tolerability of delamanid and bedaquiline used in combination. A search of peer-reviewed, scientific evidence was carried out, aimed at evaluating the efficacy/effectiveness, safety, and tolerability of delamanid and bedaquiline-containing regimens in individuals with pulmonary/extrapulmonary disease, which were bacteriologically confirmed as M/XDR-TB...
February 7, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28157163/transmission-electron-microscopy-of-xdr-mycobacterium-tuberculosis-isolates-grown-on-high-dose-of-o%C3%AF-oxacin
#5
Mohammad Arjomandzadegan, Maryam Sadrnia, Leonid Titov, Larissa Surkova, Hossein Sarmadian, Reza Ghasemikhah, Hossein Hosseiny
The aim of the study was to investigate behavior of resistant Mycobacterium tuberculosis (MTB) isolates under a high dose of ofloxacin and its morphological changes. 19 extensively drug resistant (XDR) clinical isolates of MTB were grown on Löwenstein-Jensen medium containing progressively increasing concentrations of ofloxacin (2, 4, 8, 16, 32 mg/L). Ultra-structure analyses of resistant isolates grown on ofloxacin were conducted by transmission electron microscopy (TEM). Fixation was carried out by 4% glutaraldehyde in 0...
February 2, 2017: Scientia Pharmaceutica
https://www.readbyqxmd.com/read/28141813/determination-of-plasma-concentrations-of-levofloxacin-by-high-performance-liquid-chromatography-for-use-at-a-multidrug-resistant-tuberculosis-hospital-in-tanzania
#6
Andrew Ebers, Suzanne Stroup, Stellah Mpagama, Riziki Kisonga, Isaack Lekule, Jie Liu, Scott Heysell
Therapeutic drug monitoring may improve multidrug-resistant tuberculosis (MDR-TB) treatment outcomes. Levofloxacin demonstrates significant individual pharmacokinetic variability. Thus, we sought to develop and validate a high-performance liquid chromatography (HPLC) method with ultraviolet (UV) detection for levofloxacin in patients on MDR-TB treatment. The HPLC-UV method is based on a solid phase extraction (SPE) and a direct injection into the HPLC system. The limit of quantification was 0.25 μg/mL, and the assay was linear over the concentration range of 0...
2017: PloS One
https://www.readbyqxmd.com/read/28134321/rapid-sputum-multiplex-detection-of-the-m-tuberculosis-complex-mtbc-and-resistance-mutations-for-eight-antibiotics-by-nucleotide-maldi-tof-ms
#7
Kang-Yi Su, Bo-Shiun Yan, Hao-Chieh Chiu, Chong-Jen Yu, So-Yi Chang, Ruwen Jou, Jia-Long Liu, Po-Ren Hsueh, Sung-Liang Yu
The increasing incidence of multidrug-resistant (MDR) and extensively drug-resistant (XDR) Mycobacterium tuberculosis (MTB) adds further urgency for rapid and multiplex molecular testing to identify the MTB complex and drug susceptibility directly from sputum for disease control. A nucleotide matrix-assisted-laser-desorption-ionization time-of-flight mass spectrometry (MALDI-TOF MS)-based assay was developed to identify MTB (MTBID panel) and 45 chromosomal mutations for resistance to eight antibiotics (MTBDR panel)...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28125692/recurrence-after-successful-treatment-of-multidrug-resistant-tuberculosis-in-taiwan
#8
Meng-Yu Chen, Yi-Chun Lo, Wan-Chin Chen, Kwei-Feng Wang, Pei-Chun Chan
Recurrence after successful treatment for multidrug-resistant tuberculosis (MDR-TB) is challenging because of limited retreatment options. This study aimed to determine rates and predictors of MDR-TB recurrence after successful treatment in Taiwan. Recurrence rates were analyzed by time from treatment completion in 295 M DR-TB patients in a national cohort. Factors associated with MDR-TB recurrence were examined using a multivariate Cox regression analysis. Ten (3%) patients experienced MDR-TB recurrence during a median follow-up of 4...
2017: PloS One
https://www.readbyqxmd.com/read/28111912/in-silico-approaches-and-chemical-space-of-anti-p-type-atpase-compounds-for-discovering-new-antituberculous-drugs
#9
REVIEW
Paola Santos, Fabian López-Vallejo, Carlos-Y Soto
Tuberculosis (TB) is one of the most important public health problems around the world. The emergence of multi-drug resistant (MDR) and extensively drug resistant (XDR) Mycobacterium tuberculosis strains has driven the finding of alternative anti-TB targets. In this context, P-type ATPases are interesting therapeutic targets due to their key role in ion homeostasis across the plasma membrane and the mycobacterial survival inside macrophages. In this review, in silico and experimental strategies used for the rational design of new anti-TB drugs are presented; in addition, the chemical space distribution based on the structure and molecular properties of compounds with anti-TB and anti-P-type ATPase activity is discussed...
January 22, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28100602/find-tuberculosis-strain-bank-a-resource-for-researchers-and-developers-working-on-tests-to-detect-mycobacterium-tuberculosis-and-related-drug-resistance
#10
Belay Tessema, Pamela Nabeta, Eloise Valli, Audrey Albertini, Jimena Collantes, Nguyen Huu Lan, Elena Romancenco, Nestani Tukavdze, Claudia M Denkinger, David L Dolinger
BACKGROUND: The spread of multidrug-resistant tuberculosis and extensively drug-resistant TB hampers the global efforts in the fight against tuberculosis. To enhance the development and evaluation of diagnostic tests quickly and efficiently, well characterized strains and samples from drug resistant tuberculosis patients are necessary. In this project, FIND has focused on the collection, characterization and storage of such well-characterized reference materials and to make them available to researchers and developers...
January 18, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28099825/transmission-of-extensively-drug-resistant-tuberculosis-in-south-africa
#11
N Sarita Shah, Sara C Auld, James C M Brust, Barun Mathema, Nazir Ismail, Pravi Moodley, Koleka Mlisana, Salim Allana, Angela Campbell, Thuli Mthiyane, Natashia Morris, Primrose Mpangase, Hermina van der Meulen, Shaheed V Omar, Tyler S Brown, Apurva Narechania, Elena Shaskina, Thandi Kapwata, Barry Kreiswirth, Neel R Gandhi
Background Drug-resistant tuberculosis threatens recent gains in the treatment of tuberculosis and human immunodeficiency virus (HIV) infection worldwide. A widespread epidemic of extensively drug-resistant (XDR) tuberculosis is occurring in South Africa, where cases have increased substantially since 2002. The factors driving this rapid increase have not been fully elucidated, but such knowledge is needed to guide public health interventions. Methods We conducted a prospective study involving 404 participants in KwaZulu-Natal Province, South Africa, with a diagnosis of XDR tuberculosis between 2011 and 2014...
19, 2017: New England Journal of Medicine
https://www.readbyqxmd.com/read/28098814/thioridazine-a-non-antibiotic-drug-highly-effective-in-combination-with-first-line-anti-tuberculosis-drugs-against-any-form-of-antibiotic-resistance-of-mycobacterium-tuberculosis-due-to-its-multi-mechanisms-of-action
#12
REVIEW
Leonard Amaral, Miguel Viveiros
This review presents the evidence that supports the use of thioridazine (TZ) for the therapy of a pulmonary tuberculosis infection regardless of its antibiotic resistance status. The evidence consists of in vitro and ex vivo assays that demonstrate the activity of TZ against all encountered Mycobacterium tuberculosis (Mtb) regardless of its antibiotic resistance phenotype, as well as in vivo as a therapy for mice infected with multi-drug resistant strains of Mtb, or for human subjects infected with extensively drug resistant (XDR) Mtb...
January 14, 2017: Antibiotics
https://www.readbyqxmd.com/read/28089216/diabetes-is-associated-with-severe-adverse-events-in-multidrug-resistant-tuberculosis
#13
Marcela Muñoz-Torrico, José Caminero-Luna, Giovanni Battista Migliori, Lia D'Ambrosio, José Luis Carrillo-Alduenda, Héctor Villareal-Velarde, Alfredo Torres-Cruz, Héctor Flores-Vergara, Dina Martínez-Mendoza, Cecilia García-Sancho, Rosella Centis, Miguel Ángel Salazar-Lezama, Rogelio Pérez-Padilla
INTRODUCTION: Diabetes mellitus (DM), a very common disease in Mexico, is a well-known risk factor for tuberculosis (TB). However, it is not known by which extent DM predisposes to adverse events (AE) to anti-TB drugs and/or to worse outcomes in patients with multidrug-resistant (MDR-TB) and extensively drug-resistant TB (XDR-TB). The main objective of this study was to describe the outcomes of TB treatment, the impact of DM and the prevalence of AE in a cohort of patients with MDR-/XDR pulmonary TB treated at the national TB referral centre in Mexico City...
January 11, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/28069654/reduced-chance-of-hearing-loss-associated-with-therapeutic-drug-monitoring-of-aminoglycosides-in-the-treatment-of-multidrug-resistant-tuberculosis
#14
R van Altena, J A Dijkstra, M E van der Meer, J F Borjas Howard, J G W Kosterink, D van Soolingen, T S van der Werf, J W C Alffenaar
Hearing loss and nephrotoxicity are associated with prolonged treatment duration and higher dosage of amikacin and kanamycin. In our Tuberculosis Center, we have employed therapeutic drug monitoring (TDM) targeting pre-set pharmacokinetic/pharmacodynamic (PK/PD) surrogate endpoints in an attempt to maintain efficacy while preventing (oto-)toxicity. To evaluate this strategy, we retrospectively evaluated medical charts of TB patients treated with amikacin or kanamycin in the period 2000 - 2012.Patients with culture-confirmed multi- or extensively drug resistant tuberculosis (MDR/XDR-TB) receiving amikacin or kanamycin as part of their TB treatment for at least 3 days were eligible for inclusion in this retrospective study...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28062386/rna-expression-analysis-of-efflux-pump-genes-in-clinical-isolates-of-multidrug-resistant-and-extensively-drug-resistant-mycobacterium-tuberculosis-in-south-korea
#15
Tae Sang Oh, Young Jin Kim, Hee Yoon Kang, Chang-Ki Kim, Sun Young Cho, Hee Joo Lee
Tuberculosis (TB), caused by infection with Mycobacterium tuberculosis, is an important communicable disease. Various mechanisms of resistance to antituberculosis drugs have been reported; these are principally mutations in target genes. However, not all M. tuberculosis resistance can be explained by mutations in such genes. Other resistance mechanisms associated with drug transport, such as efflux pumps, have also been reported. In this study, we investigated the expression levels of three putative efflux pumps and mutations in target genes associated with injectable agents and fluoroquinolones with clinical MDR and XDR-TB isolates...
January 3, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28059955/diagnosis-of-opportunistic-infections-hiv-co-infections-tuberculosis
#16
Lesley Scott, Pedro da Silva, Catharina C Boehme, Wendy Stevens, Christopher M Gilpin
PURPOSE OF REVIEW: Tuberculosis (TB) incidence has declined ∼1.5% annually since 2000, but continued to affect 10.4 million individuals in 2015, with 1/3 remaining undiagnosed or underreported. The diagnosis of TB among those co-infected with HIV is challenging as TB remains the leading cause of death in such individuals. Accurate and rapid diagnosis of active TB will avert mortality in both adults and children, reduce transmission, and assist in timeous decisions for antiretroviral therapy initiation...
March 2017: Current Opinion in HIV and AIDS
https://www.readbyqxmd.com/read/28043788/comparison-of-bacteriological-conversion-and-treatment-outcomes-among-mdr-tb-patients-with-and-without-diabetes-in-mexico-preliminary-data
#17
M Muñoz-Torrico, J Caminero Luna, G B Migliori, L D'Ambrosio, J L Carrillo-Alduenda, H Villareal-Velarde, A Torres-Cruz, H Flores-Ergara, D Martínez-Mendoza, C García-Sancho, R Centis, M Á Salazar-Lezama, R Pérez-Padilla
: Diabetes mellitus (DM) is a well-known risk factor for tuberculosis (TB). However, it is not known to what extent DM affects the outcome in patients with multidrug-resistant (MDR-TB) and extensively drug-resistant TB (XDR-TB) treated with second-line anti-TB drugs. The objective of this study was to compare the microbiological evolution (sputum smear and culture conversion) and final outcomes of MDR/XDR-TB patients with and without DM, managed at the national TB reference centre in Mexico City...
December 30, 2016: Revista Portuguesa de Pneumologia
https://www.readbyqxmd.com/read/28043640/alternate-efflux-pump-mechanism-may-contribute-to-drug-resistance-in-extensively-drug-resistant-isolates-of-mycobacterium-tuberculosis
#18
Akbar Kanji, Rumina Hasan, Ambreen Zaver, Asho Ali, Kehkashan Imtiaz, Mussarat Ashraf, Taane G Clark, Ruth McNerney, Samreen Shafiq, Zahra Hasan
INTRODUCTION: Extensively drug-resistant tuberculosis (XDR-TB) has emerged as one of the biggest threats to public health and TB control programs worldwide. XDR-TB is caused by Mycobacterium tuberculosis (MTB) strains resistant to rifampin and isoniazid, as well as to a fluoroquinolone and to at least one injectable aminoglycoside. Drug resistance in MTB has primarily been associated with single nucleotide polymorphisms (SNPs) in particular genes. However, it has also been shown that efflux pumps may play a role in resistance of MTB...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043617/bedaquiline-in-the-multidrug-resistant-tuberculosis-treatment-belarus-experience
#19
Alena Skrahina, Hennadz Hurevich, Dennis Falzon, Liudmila Zhilevich, Valiantsin Rusovich, Masoud Dara, Svetlana Setkina
BACKGROUND/OBJECTIVE: Outcomes of treatment for multidrug-resistant tuberculosis (MDR-TB) remain poor worldwide. Among patients with MDR-TB in Belarus who started treatment in 2012, only 54% completed it successfully, with treatment failure reported in 22% of the patients; additionally, 11% died and 13% were lost to follow-up or remained unevaluated. In Belarus, to improve outcomes, bedaquiline was introduced in MDR-TB treatment in June 2015. The national TB program developed measures to monitor safety and effectiveness of bedaquiline-containing regimens in line with the World Health Organization recommendations...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043606/ethambutol-resistance-testing-by-mutation-detection-using-mtbdrsl
#20
H Margaryan, S Rüsch-Gerdes, A Hayrapetyan, A Mirzoyan
AIMS AND OBJECTIVES: Despite the successes in managing drug-susceptible TB, drug-resistant (DR) tuberculosis is a major challenge to the effectiveness of National Tuberculosis Program in Armenia, placing the country in the list of 18 high-burden countries for MDR-TB in the WHO European Region. Estimated burden of MDR-TB in 2012 was 9.4 (7-12) and 43 (38-49) among retreatment TB cases. A total of 92 laboratory confirmed cases had been reported to the WHO (57 new and 35 previously treated) out of 511 cases tested for MDR-TB...
December 2016: International Journal of Mycobacteriology
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