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https://www.readbyqxmd.com/read/29348166/clinical-evaluation-of-a-blood-assay-to-diagnose-paucibacillary-tuberculosis-via-bacterial-antigens
#1
Chang Liu, Christopher J Lyon, Yang Bu, Zaian Deng, Elisabetta Walters, Yan Li, Liqun Zhang, Anneke C Hesseling, Edward A Graviss, Ye Hu
BACKGROUND: The diagnosis of active tuberculosis (TB)10 cases primarily relies on methods that detect Mycobacterium tuberculosis (Mtb) bacilli or their DNA in patient samples (e.g., mycobacterial culture and Xpert MTB/RIF assays), but these tests have low clinical sensitivity for patients with paucibacillary TB disease. Our goal was to evaluate the clinical performance of a newly developed assay that can rapidly diagnose active TB cases by direct detection of Mtb-derived antigens in patients' blood samples...
January 18, 2018: Clinical Chemistry
https://www.readbyqxmd.com/read/29346642/rnase7-but-not-psoriasin-nor-spla2-iia-associates-to-mycobacterium-tuberculosis-during-airway-epithelial-cells-infection
#2
Flor Torres-Juarez, Lousseine Touqui, Juan Leon-Contreras, Cesar Rivas-Santiago, Jose A Enciso-Moreno, Rogelio Hernández-Pando, Bruno Rivas-Santiago
Tuberculosis (TB) is a disease caused by Mycobacterium tuberculosis (Mtb). Innate immunity is the first line of defense against Mtb and malfunctions in any of its components is associated with the susceptibility to the disease. Epithelial products, such as host defence peptides (HDP) are the first molecules produced to counteract the infection. Although a wide variety of HDP are produced by epithelial cells only few of them have been studied during Mtb infection. Here, we assessed the expression and production of the HDPs: psoriasin, sPLA2-IIA and RNase 7 in airway epithelial cells (NCI-H292), type II pneumocytes (A549 cells) and monocytes-derived macrophages from human peripheral blood mononuclear cells (bMDM) and from the human cell line THP1(MDM) after Mtb in vitro infection...
January 16, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29345920/acetylation-by-eis-and-deacetylation-by-rv1151c-of-mycobacterium-tuberculosis-hupb-biochemical-and-structural-insight
#3
Keith D Green, Tapan Biswas, Allan H Pang, Melisa J Willby, Matthew S Reed, Olga Stuchlik, Jan Pohl, James E Posey, Oleg V Tsodikov, Sylvie Garneau-Tsodikova
Bacterial nucleoid-associated proteins (NAPs) are critical to genome integrity and chromosome maintenance. Post-translational modifications of bacterial NAPs appear to function similarly to their better studied mammalian counterparts. The histone-like NAP HupB from Mycobacterium tuberculosis (Mtb) was previously observed to be acetylated by the acetyltransferase Eis, leading to genome reorganization. We report biochemical and structural aspects of acetylation of HupB by Eis. We also found that the SirT-family NAD+-dependent deacetylase Rv1151c from Mtb deacetylated HupB in vitro and characterized the deacetylation kinetics...
January 18, 2018: Biochemistry
https://www.readbyqxmd.com/read/29345365/deletion-of-bcg-hip1-protease-enhances-dendritic-cell-and-cd4-t-cell-responses
#4
Erica Bizzell, Jonathan Kevin Sia, Melanie Quezada, Ana Enriquez, Maria Georgieva, Jyothi Rengarajan
Dendritic cells (DCs) play a key role in the generation of CD4 T cell responses to pathogens. Mycobacterium tuberculosis (Mtb) harbors immune evasion mechanisms that impair DC responses and prevent optimal CD4 T cell immunity. The vaccine strain Mycobacterium bovis Bacille Calmette-Guérin (BCG) shares many of the immune evasion proteins utilized by Mtb, but the role of these proteins in DC and T cell responses elicited by BCG is poorly understood. We previously reported that the Mtb serine protease, Hip1, promotes sub-optimal DC responses during infection...
December 28, 2017: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/29342972/the-effect-of-combining-natural-terpenes-and-antituberculous-agents-against-reference-and-clinical-mycobacterium-tuberculosis-strains
#5
Elwira Sieniawska, Rafal Sawicki, Marta Swatko-Ossor, Agnieszka Napiorkowska, Agata Przekora, Grazyna Ginalska, Ewa Augustynowicz-Kopec
Background: On account of emergence of multi- and extensively drug-resistant Mycobacterium tuberculosis (Mtb) strains, combinations of drugs with natural compounds were tested to search for antibiotic activity enhancers. In this work we studied terpenes (α-pinene, bisabolol, β-elemene, (R)-limonene, (S)-limonene, myrcene, sabinene), which are the main constituents of essential oil obtained from Mutellina purpurea L., a plant with described antitubercular activity, to investigate their interactions with antibiotics against reference Mtb strains and multidrug-resistant clinical isolates...
January 15, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29339565/a-home-visiting-parenting-program-and-child-obesity-a-randomized-trial
#6
Monica Roosa Ordway, Lois S Sadler, Margaret L Holland, Arietta Slade, Nancy Close, Linda C Mayes
BACKGROUND: Young children living in historically marginalized families are at risk for becoming adolescents with obesity and subsequently adults with increased obesity-related morbidities. These risks are particularly acute for Hispanic children. We hypothesized that the prevention-focused, socioecological approach of the "Minding the Baby" (MTB) home visiting program might decrease the rate of childhood overweight and obesity early in life. METHODS: This study is a prospective longitudinal cohort study in which we include data collected during 2 phases of the MTB randomized controlled trial...
January 16, 2018: Pediatrics
https://www.readbyqxmd.com/read/29334710/-a-study-on-genotype-of-271-mycobacterium-tuberculosis-isolates-in-6-prefectures-in-yunnan-province
#7
L Y Chen, X Yang, H H Ru, H J Yang, S Q Yan, L Ma, J O Chen, R Yang, L Xu
Objective: To understand the characteristics of genotypes of Mycobacterium tuberculosis isolates in Yunnan province, and provide the molecular epidemiological evidence for prevention and control of tuberculosis in Yunnan Province. Methods: Mycobacterium Tuberculosis isolates were collected from 6 prefectures of Yunnan province in 2014 and their Genetypes of Mycobacterium tuberculosis isolates were obtained using spoligotyping and multiple locus variable numbers of tandem repeats analysis (MLVA). The results of spoligotyping were entered into the SITVITWEB database to obtain the Spoligotyping International Type (SIT) patterns and the sublineages of MTB isolates...
January 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
https://www.readbyqxmd.com/read/29334373/prevention-of-tuberculosis-in-rhesus-macaques-by-a-cytomegalovirus-based-vaccine
#8
Scott G Hansen, Daniel E Zak, Guangwu Xu, Julia C Ford, Emily E Marshall, Daniel Malouli, Roxanne M Gilbride, Colette M Hughes, Abigail B Ventura, Emily Ainslie, Kurt T Randall, Andrea N Selseth, Parker Rundstrom, Lauren Herlache, Matthew S Lewis, Haesun Park, Shannon L Planer, John M Turner, Miranda Fischer, Christina Armstrong, Robert C Zweig, Joseph Valvo, Jackie M Braun, Smitha Shankar, Lenette Lu, Andrew W Sylwester, Alfred W Legasse, Martin Messerle, Michael A Jarvis, Lynn M Amon, Alan Aderem, Galit Alter, Dominick J Laddy, Michele Stone, Aurelio Bonavia, Thomas G Evans, Michael K Axthelm, Klaus Früh, Paul T Edlefsen, Louis J Picker
Despite widespread use of the bacille Calmette-Guérin (BCG) vaccine, tuberculosis (TB) remains a leading cause of global mortality from a single infectious agent (Mycobacterium tuberculosis or Mtb). Here, over two independent Mtb challenge studies, we demonstrate that subcutaneous vaccination of rhesus macaques (RMs) with rhesus cytomegalovirus vectors encoding Mtb antigen inserts (hereafter referred to as RhCMV/TB)-which elicit and maintain highly effector-differentiated, circulating and tissue-resident Mtb-specific CD4+ and CD8+ memory T cell responses-can reduce the overall (pulmonary and extrapulmonary) extent of Mtb infection and disease by 68%, as compared to that in unvaccinated controls, after intrabronchial challenge with the Erdman strain of Mtb at ∼1 year after the first vaccination...
January 15, 2018: Nature Medicine
https://www.readbyqxmd.com/read/29325545/phthiocerol-dimycocerosates-promote-access-to-the-cytosol-and-intracellular-burden-of-mycobacterium-tuberculosis-in-lymphatic-endothelial-cells
#9
Thomas R Lerner, Christophe J Queval, Antony Fearns, Urska Repnik, Gareth Griffiths, Maximiliano G Gutierrez
BACKGROUND: Phthiocerol dimycocerosates (PDIM), glycolipids found on the outer surface of virulent members of the Mycobacterium tuberculosis (Mtb) complex, are a major contributing factor to the pathogenesis of Mtb. Myelocytic cells, such as macrophages and dendritic cells, are the primary hosts for Mtb after infection and previous studies have shown multiple roles for PDIM in supporting Mtb in these cells. However, Mtb can infect other cell types. We previously showed that Mtb efficiently replicates in human lymphatic endothelial cells (hLECs) and that the hLEC cytosol acts as a reservoir for Mtb in humans...
January 4, 2018: BMC Biology
https://www.readbyqxmd.com/read/29325465/prevalence-of-positive-quantiferon-gold-in-tube-testing-in-hidradenitis-suppurativa
#10
Tina Boortalary, Kanchan Misra, Sean McNish, Derek Jones, Victoria K Shanmugam
Hidradenitis suppurativa (HS) is a chronic, recurrent, inflammatory disease of the apocrine sweat glands. Tumor necrosis factor-alpha (TNF-α) inhibitors are commonly used to treat HS. However, prior to initiating therapy patients must be screened for mycobacterium tuberculosis (mTB) exposure. Several mTB screening tests based on interferon gamma release assays are commercially available, but the performance of these assays in the HS population is unknown. The purpose of this study was to investigate the performance of the QuantiFERON gold in-tube assay (QFT-GIT) in a cohort of patients with Hidradenitis suppurativa (HS)...
January 12, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29325117/blood-rna-signatures-prospectively-discriminate-controllers-from-progressors-early-after-low-dose-m-tuberculosis-infection-of-cynomolgus-macaques
#11
Ethan G Thompson, Smitha Shankar, Hannah P Gideon, Jackie Braun, Joe Valvo, Jason Skinner, Alan Aderem, JoAnne L Flynn, Philana Ling Lin, Daniel E Zak
The cynomolgus macaque model of low-dose Mycobacterium tuberculosis (Mtb) infection recapitulates clinical aspects of human TB pathology but it is unknown whether the two systems are sufficiently similar that host-based signatures of TB will be predictive across species. By blind prediction, we demonstrate that a subset of genes comprising a human signature for TB risk is simultaneously predictive in humans and macaques and prospectively discriminates progressor from controller animals 3-6 weeks after infection...
January 8, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29321075/a-phase-i-open-label-trial-on-the-safety-and-immunogenicity-of-the-adjuvanted-tuberculosis-subunit-vaccine-h1-ic31%C3%A2-in-people-living-in-a-tb-endemic-area
#12
Jemal Hussein, Martha Zewdie, Lawrence Yamuah, Ahmed Bedru, Markos Abebe, Alemnew F Dagnew, Menberework Chanyalew, Asfawesen G Yohannes, Jemal Ahmed, Howard Engers, T Mark Doherty, Peter Bang, Ingrid Kromann, Søren T Hoff, Abraham Aseffa
BACKGROUND: H1/IC31® is a tuberculosis (TB) subunit vaccine candidate consisting of the fusion protein of Ag85B and ESAT-6 (H1) formulated with the IC31® adjuvant. Previous trials have reported on the H1/IC31® vaccine in M. tuberculosis (Mtb)-naïve, BCG-vaccinated and previously Mtb-infected individuals. In this trial, conducted between December 2008 and April 2010, the safety and immunogenicity of H1/IC31® was assessed in participants living in Ethiopia - a highly TB-endemic area...
January 10, 2018: Trials
https://www.readbyqxmd.com/read/29320502/impaired-ifn-%C3%AE-mediated-signal-in-dendritic-cells-differentiates-active-from-latent-tuberculosis
#13
Stefania Parlato, Teresa Chiacchio, Debora Salerno, Linda Petrone, Luciano Castiello, Giulia Romagnoli, Irene Canini, Delia Goletti, Lucia Gabriele
Individuals exposed to Mycobacterium tuberculosis (Mtb) may be infected and remain for the entire life in this condition defined as latent tuberculosis infection (LTBI) or develop active tuberculosis (TB). Among the multiple factors governing the outcome of the infection, dendritic cells (DCs) play a major role in dictating antibacterial immunity. However, current knowledge on the role of the diverse components of human DCs in shaping specific T-cell response during Mtb infection is limited. In this study, we performed a comparative evaluation of peripheral blood circulating DC subsets as well as of monocyte-derived Interferon-α DCs (IFN-DCs) from patients with active TB, subjects with LTBI and healthy donors (HD)...
2018: PloS One
https://www.readbyqxmd.com/read/29319836/tbc-kan-p%C3%A3-visas-med-pcr-%C3%A2-men-bara-i-direktpositiva-luftv%C3%A3-gsprov
#14
Bodil Jönsson, Elisabet Lönnermark, Malin Ridell
TB can be detected with PCR - but only in smear-positive respiratory samples Unnecessary and inappropriate clinical requests represent a great waste of time and money and may also result in false diagnoses. PCR-techniques, such as Cobas TaqMan MTB, are used for rapid detection of tuberculosis (TB).  These assays are only validated for respiratory specimens, but they are commonly requested also for non-respiratory specimens.  These assays perform well in smear-positive respiratory samples, while the sensitivities are quite unsatisfactory for both respiratory and non-respiratory smear-negatives samples...
January 9, 2018: Läkartidningen
https://www.readbyqxmd.com/read/29319347/sigma-factors-mediated-signaling-in-mycobacterium-tuberculosis
#15
Peifu Zhou, Xinpeng Wang, Yuzhong Zhao, Wei Yuan, Jianping Xie
Activation of signaling cascades is critical for Mycobacterium tuberculosis (Mtb) to adapt the macrophage lifestyle. Parallel to several signal systems, sigma factor systems, especially the extra-cytoplasmic function sigma factors, are crucial for Mtb signaling. Most sigma factors lack a signal sensory domain and often are activated by various proteins that perceive the environmental cues and relay the signals through variegated post-translational modifications via the activity of antisigma factor, protein kinase and related transcriptional regulators...
January 10, 2018: Future Microbiology
https://www.readbyqxmd.com/read/29317718/protein-tyrosine-kinase-ptka-is-required-for-mycobacterium-tuberculosis-growth-in-macrophages
#16
Dennis Wong, Wu Li, Joseph D Chao, Peifu Zhou, Gagandeep Narula, Clement Tsui, Mary Ko, Jianping Xie, Carlos Martinez-Frailes, Yossef Av-Gay
Protein phosphorylation plays a key role in Mycobacterium tuberculosis (Mtb) physiology and pathogenesis. We have previously shown that a secreted protein tyrosine phosphatase, PtpA, is essential for Mtb inhibition of host macrophage acidification and maturation, and is a substrate of the protein tyrosine kinase, PtkA, encoded in the same operon. In this study, we constructed a ∆ptkA deletion mutant in Mtb and found that the mutant exhibited impaired intracellular survival in the THP-1 macrophage infection model, correlated with the strain's inability to inhibit macrophage phagosome acidification...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29311240/potential-immunological-biomarkers-for-detection-of-mycobacterium-tuberculosis-infection-in-endemic-setting-ethiopia
#17
Takele Teklu, Kwon Keehwan, Biniam Wondale, Milkessa HaileMariam, Mengistu Legesse, Girmay Medhin, Aboma Zewude, Rembert Pieper, Gobena Ameni
Accurate diagnosis and early treatment of tuberculosis (TB) and latent TB infection (LTBI) are vital to prevent and control TB. The lack of specific biomarkers hinders these efforts. This study's purpose was to screen immunological markers that discriminate M. tuberculosis (Mtb) infection outcomes in an endemic setting of Ethiopia. Whole blood from 90 participants was stimulated using the ESAT-6/CFP-10 antigen cocktail. The interferon-γ (IFN-γ)-based QuantiFERON diagnostic test was used to distinguish between LTBI and uninfected control cases...
January 8, 2018: Infection and Immunity
https://www.readbyqxmd.com/read/29310595/potential-of-dosr-and-rpf-antigens-from-mycobacterium-tuberculosis-to-discriminate-between-latent-and-active-tuberculosis-in-a-tuberculosis-endemic-population-of-medellin-colombia
#18
Leonar Arroyo, Diana Marín, Kees L M C Franken, Tom H M Ottenhoff, Luis F Barrera
BACKGROUND: Tuberculosis (TB) remains one of the most deadly infectious diseases. One-third to one-fourth of the human population is estimated to be infected with Mycobacterium tuberculosis (Mtb) without showing clinical symptoms, a condition called latent TB infection (LTBI). Diagnosis of Mtb infection is based on the immune response to a mixture of mycobacterial antigens (PPD) or to Mtb specific ESAT-6/CFP10 antigens (IGRA), highly expressed during the initial phase of infection. However, the immune response to PPD and IGRA antigens has a low power to discriminate between LTBI and PTB...
January 8, 2018: BMC Infectious Diseases
https://www.readbyqxmd.com/read/29310414/left-extensive-infection-in-the-forearm-caused-by-whitlow-infected-by-mycobacterium-tuberculosis-a-case-report
#19
Tao Wang, Gang Zhao, Yong-Jun Rui, Zheng-Feng Lu, Jing-Yi Mi
INTRODUCTION: Whitlow is a common disease in clinic, characterized by pain and swelling of finger. However, few articles had reported on extensive infection in the forearm caused by whitlow infected by mycobacterium tuberculosis (MTB). PATIENT CONCERNS: A 70-year-old Chinese female complained of fester in back of left hand for 5 days. She had a history of recurrent whitlow for 14 months and pulmonary tuberculosis (TB). She received treatment in another hospital due to whitlow on July 2016...
December 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29306028/unique-mtb-protein-found-in-urine-of-tb-patients-discovery-of-a-unique-mycobacterium-tuberculosis-protein-through-proteomic-analysis-of-urine-from-patients-with-active-tuberculosis
#20
Nira Pollock, Rakesh Dhiman, Nada Daifalla, Maha Farhat, Antonio Campos-Neto
Identification of pathogen-specific biomarkers present in patients' serum or urine samples can be a useful diagnostic approach. In efforts to discover Mycobacterium tuberculosis (Mtb) biomarkers we identified by mass spectroscopy a unique 21-mer Mtb peptide sequence (VVLGLTVPGGVELLPGVALPR) present in the urines of TB patients from Zimbabwe. This peptide has 100% sequence homology with the protein TBCG_03312 from the C strain of Mtb (a clinical isolate identified in New York, NY, USA) and 95% sequence homology with Mtb oxidoreductase (MRGA423_21210) from the clinical isolate MTB423 (identified in Kerala, India)...
January 3, 2018: Microbes and Infection
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