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https://www.readbyqxmd.com/read/28440335/mycobacterium-tuberculosis-pe_pgrs41-enhances-the-intracellular-survival-of-m-smegmatis-within-macrophages-via-blocking-innate-immunity-and-inhibition-of-host-defense
#1
Wanyan Deng, Quanxin Long, Jie Zeng, Ping Li, Wenmin Yang, Xinchun Chen, Jianping Xie
The success of Mycobacterium tuberculosis (M. tuberculosis) as a pathogen is largely contributes to its ability to manipulate the host immune responses. The genome of M. tuberculosis encodes multiple immune-modulatory proteins, including several members of the multi-genic PE_PPE family. Despite of intense research, the roles of PE_PGRS proteins in mycobacterial pathogenesis remain elusive. The function of M. tuberculosis PE_PGRS41, characterized by an extended and unique C-terminal domain, was studied. Expression of PE_PGRS41 in Mycobacterium smegmatis, a non-pathogenic species intrinsically deficient of PE_PGRS, severely impaired the resistance of the recombinant to multiple stresses via altering the cell wall integrity...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28440326/complex-multifractal-nature-in-mycobacterium-tuberculosis-genome
#2
Saurav Mandal, Tanmoy Roychowdhury, Keilash Chirom, Alok Bhattacharya, R K Brojen Singh
The mutifractal and long range correlation (C(r)) properties of strings, such as nucleotide sequence can be a useful parameter for identification of underlying patterns and variations. In this study C(r) and multifractal singularity function f(α) have been used to study variations in the genomes of a pathogenic bacteria Mycobacterium tuberculosis. Genomic sequences of M. tuberculosis isolates displayed significant variations in C(r) and f(α) reflecting inherent differences in sequences among isolates. M. tuberculosis isolates can be categorised into different subgroups based on sensitivity to drugs, these are DS (drug sensitive isolates), MDR (multi-drug resistant isolates) and XDR (extremely drug resistant isolates)...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28438933/pyrazinoic-acid-inhibits-a-bifunctional-enzyme-in-mycobacterium-tuberculosis
#3
Moses Njire, Na Wang, Bangxing Wang, Yaoju Tan, Xingshan Cai, Yanwen Liu, Julius Mugweru, Jintao Guo, H M Adnan Hameed, Shouyong Tan, Jianxiong Liu, Wing Wai Yew, Eric Nuermberger, Gyanu Lamichhane, Jinsong Liu, Tianyu Zhang
Pyrazinamide (PZA), an indispensable component of modern tuberculosis treatment, acts as a key sterilizing drug. While the mechanism of activation of this prodrug by Mycobacterium tuberculosis into pyrazinoic acid (POA) has been extensively studied, not all molecular determinants that confer resistance to this mysterious drug have been identified. Here, we report a new PZA resistance determinant: Asp67Asn substitution in Rv2783 confers M. tuberculosis resistance to PZA. Expression of the mutant but not the wild-type allele in M...
April 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28438221/isolated-splenic-tuberculosis-with-subsequent-paradoxical-deterioration-a-case-report
#4
Frederick Wangai, Loice Achieng, George Otieno, Jacqueline Njoroge, Tabitha Wambaire, Jamilla Rajab
BACKGROUND: Isolated tuberculosis of the spleen has been described occasionally in literature, mostly in immunosuppressed individuals with various risk factors. Sequestration in the spleen makes such Mycobacterium tuberculosis infection difficult to diagnose. This report describes an extremely rare case of isolated splenic tuberculosis in an immunocompetent individual. CASE PRESENTATION: A 26 year old Kenyan male presented with pyrexia of unknown origin, with negative screening tests for bacterial, fungal and parasitic infections...
April 24, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28438143/erratum-to-high-pre-diagnosis-attrition-among-patients-with-presumptive-mdr-tb-an-operational-research-from-bhopal-district-india
#5
Hemant Deepak Shewade, Arun M Kokane, Akash Ranjan Singh, Manoj Verma, Malik Parmar, Ashish Chauhan, Sanjay Singh Chahar, Manoj Tiwari, Sheeba Naz Khan, Vivek Gupta, Jaya Prasad Tripathy, Mukesh Nagar, Sanjai Kumar Singh, Pradeep Kumar Mehra, Ajay M V Kumar
No abstract text is available yet for this article.
April 24, 2017: BMC Health Services Research
https://www.readbyqxmd.com/read/28438132/early-detection-of-multidrug-and-pre-extensively-drug-resistant-tuberculosis-from-smear-positive-sputum-by-direct-sequencing
#6
Jun Chen, Peng Peng, Yixiang Du, Yi Ren, Lifeng Chen, Youyi Rao, Weihua Wang
BACKGROUND: Emergence of multidrug- and extensively drug-resistant tuberculosis (M/XDR-TB) is a major hurdle for TB control programs especially in developing countries like China. Resistance to fluoroquinolones is high among MDR-TB patients. Early diagnosis of MDR/pre-XDR-TB is essential for lowering transmission of drug-resistant TB and adjusting the treatment regimen. METHODS: Smear-positive sputum specimens (n = 186) were collected from Wuhan Institute for Tuberculosis Control...
April 24, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28437174/more-than-fever-thermoregulatory-responses-to-immunological-stimulation-and-consequences-of-thermoregulatory-strategy-on-innate-immunity-in-gopher-tortoises-gopherus-polyphemus
#7
Jeffrey M Goessling, Craig Guyer, Mary T Mendonça
Organisms possess a range of thermoregulatory strategies that may vary in response to sickness, thereby driving important life-history consequences. Because the immune system is vital to maintaining organism function, understanding the suite of immune responses to infection indicates basic costs and benefits of physiological strategies. Here, we assessed consequences of thermoregulation and seasonality on immune function in both immunologically stimulated and nonstimulated gopher tortoises (Gopherus polyphemus)...
July 2017: Physiological and Biochemical Zoology: PBZ
https://www.readbyqxmd.com/read/28436493/an-attenuated-mycobacterium-tuberculosis-clinical-strain-with-a-defect-in-esx-1-secretion-induces-minimal-host-immune-responses-and-pathology
#8
Helena Strand Clemmensen, Niels Peter Hell Knudsen, Erik Michael Rasmussen, Jessica Winkler, Ida Rosenkrands, Ahmad Ahmad, Troels Lillebaek, David R Sherman, Peter Lawætz Andersen, Claus Aagaard
Although Mycobacterium tuberculosis (M.tb) DK9897 is an attenuated strain, it was isolated from a patient with extrapulmonary tuberculosis and vaccination with a subunit vaccine (H56) induced poor protection against it. Both attenuation and lack of protection are because M.tb DK9897 cannot secrete the EsxA virulence factor nor induce a host response against it. Genome sequencing identified a frameshift mutation in the eccCa1 gene. Since the encoded EccCa1 protein provides energy for ESX-1 secretion, it suggested a defect in the ESX-1 type VII secretion system...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28436453/functional-thermodynamics-structural-and-biological-studies-of-in-silico-identified-inhibitors-of-mycobacterium-tuberculosis-enoyl-acp-coa-reductase-enzyme
#9
Leonardo K B Martinelli, Mariane Rotta, Anne D Villela, Valnês S Rodrigues-Junior, Bruno L Abbadi, Rogério V Trindade, Guilherme O Petersen, Giuliano M Danesi, Laura R Nery, Ivani Pauli, Maria M Campos, Carla D Bonan, Osmar Norberto de Souza, Luiz A Basso, Diogenes S Santos
Novel chemotherapeutics agents are needed to kill Mycobacterium tuberculosis, the main causative agent of tuberculosis (TB). The M. tuberculosis 2-trans-enoyl-ACP(CoA) reductase enzyme (MtInhA) is the druggable bona fide target of isoniazid. New chemotypes were previously identified by two in silico approaches as potential ligands to MtInhA. The inhibition mode was determined by steady-state kinetics for seven compounds that inhibited MtInhA activity. Dissociation constant values at different temperatures were determined by protein fluorescence spectroscopy...
April 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28435564/acute-paraplegia-in-a-toddler-a-diagnostic-journey-compounding-the-challenge-in-management-a-case-report
#10
J H Goh, M Fazir, N A Zainal-Abidin, D Amir, M Singh
Spinal tuberculosis is not common in the paediatric age group. Initial clinical features are often vague and non specific until the disease progresses to later stages. We highlight the diagnostic difficulties and management challenges of a complicated extradural tuberculoma with neurological deficits in a very young girl.
July 2016: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/28434972/one-bacillus-to-rule-them-all-investigating-broad-range-host-adaptation-in-mycobacterium-bovis
#11
REVIEW
Adrian R Allen
Recent advances are permitting researchers to undertake largescale comparative genomics studies within and between bacterial species to determine the types of genetic change that underpin the phenotypic spectrum that runs from strict host adaptation to generalist. Within the Mycobacterium tuberculosis complex (MTBC) of bacilli, there is much heterogeneity in host specificity. Globally, Mycobacterium bovis exhibits a broad host range encompassing domesticated bovine and wildlife animals unlike the human adapted specialist M...
April 20, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28433210/non-tuberculous-mycobacteria-an-emerging-threat
#12
Susana Martínez González, Arantxa Cano Cortés, Luis Alfonso Sota Yoldi, José María García García, Luz María Alba Álvarez, Juan José Palacios Gutiérrez
INTRODUCTION AND OBJECTIVE: Non-tuberculous mycobacteria (NTM) isolates are becoming more common. The main objective of our study was to establish the number and diversity of NTM species in our region and their distribution according to the source sample, age and gender of the patients, and to analyse clinically significant isolates. METHODOLOGY: Prospective study of all NTM isolated in Asturias from 2005 to 2012. Samples were processed following internationally accepted guidelines...
April 19, 2017: Archivos de Bronconeumología
https://www.readbyqxmd.com/read/28433200/the-case-against-performing-pleural-biopsies-for-the-aetiological-diagnosis-of-exudates
#13
J M Porcel
In most cases, the etiological diagnosis of pleural exudates does not require a pleural biopsy. However, when it is considered necessary, the biopsy should seldom be conducted using invasive methods such as thoracoscopy. Two paradigmatic examples are pleural tuberculosis and malignant effusions. In many centres, pleural fluid adenosine deaminase measurement has replaced closed pleural biopsies in the diagnosis of tuberculosis. Similarly, pathological and molecular studies on pleural fluid cell blocks or alternatively, image-guided pleural biopsies have drastically reduced the need for thoracoscopy...
April 19, 2017: Revista Clínica Española
https://www.readbyqxmd.com/read/28432379/high-resolution-tomography-based-quantification-of-cortical-porosity-and-cortical-thickness-at-the-surgical-neck-of-the-humerus-during-aging
#14
Tobias Helfen, Christoph M Sprecher, Ursula Eberli, Boyko Gueorguiev, Peter E Müller, Robert G Richards, Florian Schmidutz
Fractures of the proximal humerus are highly related to age and osteoporotic bone remodeling. Previous studies have highlighted the cortex as a major side of the bone loss, but the microstructural changes of the humerus have not been evaluated entirely. Sixty-four (n = 64) humeri of a representative collective (18-100 years) were scanned with high-resolution peripheral quantitative computed tomography (82 µm). Bone mineral density (BMD), trabecular bone volume fraction (Tb.BV/TV), cortical thickness (Ct...
April 21, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28432321/mycobacterium-tuberculosis-lineage-distribution-in-xinjiang-and-gansu-provinces-china
#15
Haixia Chen, Li He, Hairong Huang, Chengmin Shi, Xumin Ni, Guangming Dai, Liang Ma, Weimin Li
Mycobacterium tuberculosis (M. tuberculosis) genotyping has dramatically improved the understanding of the epidemiology of tuberculosis (TB). In this study, 187 M. tuberculosis isolates from Xinjiang Uygur Autonomous Region (Xinjiang) and Gansu province in China were genotyped using large sequence polymorphisms (LSPs) and variable number tandem repeats (VNTR). Ten isolates, which represent major nodes of VNTR-based minimum spanning tree, were selected and subsequently subjected to multi-locus sequence analyses (MLSA) that include 82 genes...
April 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28431845/infection-prevention-and-control-and-the-refugee-population-experiences-from-the-university-of-louisville-global-health-center
#16
Ruth M Carrico, Linda Goss, Timothy L Wiemken, Rahel S Bosson, Paula Peyrani, William A Mattingly, Allison Pauly, Rebecca A Ford, Stanley Kotey, Julio A Ramirez
BACKGROUND: During 2016, approximately 140,000 individuals entered the United States as part of the federal government refugee resettlement program and established themselves in communities in virtually every state. No national database regarding refugee health currently exists; therefore, little is known about existing infectious diseases, conditions, and cultural practices that impact successful acculturation. The objective of this report is to identify what is currently known about refugees and circumstances important to infection prevention and control with respect to their roles as new community members, employees, and consumers of health care...
April 18, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28431548/water-pipe-smoke-condensate-increases-the-internalization-of-mycobacterium-bovis-of-type-ii-alveolar-epithelial-cells-a549
#17
Esmaeil Mortaz, Shamila D Alipoor, Masoud Movassaghi, Mohammad Varahram, Jahangir Ghorbani, Gert Folkerts, Johan Garssen, Ian M Adcock
BACKGROUND: Tuberculosis (TB) is a major global health problem, and there is an association between tobacco smoke and TB. Water pipe smoking has become an increasing problem not only in Middle Eastern countries but also globally because users consider it as safer than cigarettes. The presence of high levels of toxic substances in water-pipe smoke may be a predisposing factor that enhances the incidence of pulmonary disorders. For example, uncontrolled macropinocytosis in alveolar epithelial cells following exposure to water-pipe smoke may predispose subjects to pulmonary infection...
April 21, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/28431545/optimising-spatial-accessibility-to-inform-rationalisation-of-specialist-health-services
#18
Catherine M Smith, Hannah Fry, Charlotte Anderson, Helen Maguire, Andrew C Hayward
BACKGROUND: In an era of budget constraints for healthcare services, strategies for provision of services that improve quality whilst saving costs are highly valued. A proposed means to achieve this is consolidation of services into fewer specialist centres, but this may lead to reduced spatial accessibility. We describe a methodology which includes implementing a combinatorial optimisation algorithm to derive combinations of services which optimise spatial accessibility in the context of service rationalisation, and demonstrate its use through the exemplar of tuberculosis clinics in London...
April 21, 2017: International Journal of Health Geographics
https://www.readbyqxmd.com/read/28429346/dynamic-and-contrast-enhanced-ct-imaging-of-lung-carcinoma-pulmonary-tuberculoma-and-inflammatory-pseudotumor
#19
C-R Li, Y-Z Li, Y-M Li, Y-S Zheng
OBJECTIVE: Our main aim was to investigate the effect of dynamic and contrast enhanced CT imaging on differential diagnosis of lung carcinoma, pulmonary tuberculoma, inflammatory pseudotumor, and coexisting pulmonary tuberculosis and lung cancer. PATIENTS AND METHODS: About, 144 patients with pulmonary sarcoidosis as the study subjects were chosen which included: 36 patients with lung carcinoma, 36 patients with pulmonary tuberculoma, 36 patients with inflammatory pseudotumor, 36 patients with coexisting pulmonary tuberculosis and lung cancer...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28429168/bedaquiline-susceptibility-test-for-totally-drug-resistant-tuberculosis-mycobacterium-tuberculosis
#20
Ji-Chan Jang, Yong-Gyun Jung, Jungil Choi, Hyunju Jung, Sungweon Ryoo
This study aimed to provide information that bedaquilline is significantly effective for treatment of totally drug resistant (TDR) Mycobacterium tuberculosis that shows resistant to all first- and second-line drugs-using an innovative disc agarose channel (DAC) system. Time-lapse images of single bacterial cells under culture conditions with different concentrations of bedaquiline were analysed by image processing software to determine minimum inhibitory concentrations (MICs). Bedaquiline inhibited the growth of TDR M...
April 20, 2017: Journal of Microbiology / the Microbiological Society of Korea
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