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https://www.readbyqxmd.com/read/27914088/murine-mycobacterium-marinum-infection-as-a-model-for-tuberculosis
#1
Julia Lienard, Fredric Carlsson
Mycobacteria are a major human health problem globally. Regarding tuberculosis the situation is worsened by the poor efficacy of current vaccine regimens and by emergence of drug-resistant strains (Manjelievskaia J et al, Trans R Soc Trop Med Hyg 110: 110, 2016; Pereira et al., Lancet Infect Dis 12:300-306, 2012; http://www.who.int/tb/publications/global_report/en/) undermining both disease-prevention and available treatments. Thus, increased basic understanding of mycobacterial-and particularly Mycobacterium tuberculosis-virulence strategies and pathogenesis is of great importance...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27913648/cd36-mediated-uptake-of-surfactant-lipids-by-human-macrophages-promotes-intracellular-growth-of-mycobacterium-tuberculosis
#2
Claire E Dodd, Charlie J Pyle, Rebecca Glowinski, Murugesan V S Rajaram, Larry S Schlesinger
Mycobacterium tuberculosis imposes a large global health burden as the airborne agent of tuberculosis. Mycobacterium tuberculosis has been flourishing in human populations for millennia and is therefore highly adapted to the lung environment. Alveolar macrophages, a major host cell niche for M. tuberculosis, are not only phagocytose inhaled microbes and particulate matter but are also crucial in catabolizing lung surfactant, a lipid-protein complex that lines the alveolar spaces. Because macrophage host defense properties can be regulated by surfactant and M...
December 15, 2016: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/27910720/the-management-of-infection-with-mycobacterium-tuberculosis-in-young-children-post-2015-an-opportunity-to-close-the-policy-practice-gap
#3
Stephen M Graham
The treatment of infection with Mycobacterium tuberculosis in young children is supported by universal policy based on strong rationale and evidence of effectiveness, but has rarely been implemented in tuberculosis endemic countries. Areas covered: This review highlights a number of important recent developments that provide an unprecedented opportunity to close the policy-practice gap, as well as ongoing needs to facilitate implementation under programmatic conditions and scale-up. Expert commentary: The WHO's End TB Strategy and Stop TB Partnership's Plan to End TB provide ambitious targets for prevention at a time when National Tuberculosis Programs in tuberculosis endemic countries are increasing attention to the challenges of management and prevention of tuberculosis disease in children...
December 2, 2016: Expert Review of Respiratory Medicine
https://www.readbyqxmd.com/read/27909634/nontuberculous-mycobacteria-lymphadenitis-a-case-report
#4
Amanda M Krantz, Meera Varnam, Cristina Fernandez
Atypical mycobacteria, also known as nontuberculous mycobacteria (NTM) includes acid-fast bacteria other than Mycobacterium tuberculosis. NTM can be isolated from a variety of environmental sources including water, food products, domestic animals, and soil; human exposure is typically from soil to the oral cavity and respiratory tract. Diagnosis of NTM is suspected in children less than five years old with subacute, unilateral, non-tender cervicofacial lymphadenitis in combination with a history of water exposure, penetrating injection, as well as negative routine cultures or response to antistaphylococcal and antistreptococcal antibiotics...
October 25, 2016: Curēus
https://www.readbyqxmd.com/read/27906474/tuning-the-energy-transfer-efficiency-between-ce-3-and-ln-3-ions-ln-tm-sm-tb-dy-by-controlling-the-crystal-phase-of-nayf4-nanocrystals
#5
Venkata N K B Adusumalli, Heramba V S R M Koppisetti, Sagar Ganguli, Shyam Sarkar, Venkataramanan Mahalingam
NaYF4 is a superior host matrix to study the luminescence properties of lanthanide (Ln(3+) ) ions. Ln(3+) ions in hexagonal-phase NaYF4 (β-phase) nanocrystals (NCs) exhibit strong luminescence via an upconversion process compared to cubic NaYF4 (α-phase) NCs. However, in Ce(3+) /Ln(3+) -doped NaYF4 NCs (Ln=Tm, Tb, Sm, Dy) the α-phase NaYF4 NCs shows strong luminescence compared to their counterpart β-phase NCs despite the latter being much larger in size. This is attributed to comparatively large overlap between Ce(3+) ions emission band with excited energy levels of those Ln(3+) ions in α-phase compared to β-phase NCs...
December 1, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27906027/antiretroviral-treatment-regardless-of-cd4-count-the-universal-answer-to-a-contextual-question
#6
REVIEW
Serge P Eholié, Anani Badje, Gérard M Kouame, Jean-Baptiste N'takpe, Raoul Moh, Christine Danel, Xavier Anglaret
After a period where it was recommended to start antiretroviral therapy (ART) early, the CD4 threshold for treating asymptomatic adults dropped to 200/mm(3) at the beginning of the 2000s. This was mostly due to a great prudence with regards to drug toxicity. The ART-start CD4 threshold in most international guidelines was then raised to 350/mm(3) in 2006-2009 and to 500/mm(3) in 2009-2013. Between 2012 and 2015, international guidelines went the last step further and recommended treating all HIV-infected adults regardless of their CD4 count...
July 26, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27906016/high-prevalence-of-being-overweight-and-obese-hiv-infected-persons-before-and-after-24%C3%A2-months-on-early-art-in-the-anrs-12136-temprano-trial
#7
Calixte Guehi, Anani Badjé, Delphine Gabillard, Eric Ouattara, Serge Olivier Koulé, Raoul Moh, Didier Ekouevi, Hugues Ahibo, Jean Baptiste N'Takpé, Gérard Kouamé Menan, Nina Deschamps, Jerôme Lecarrou, Serge Eholié, Xavier Anglaret, Christine Danel
BACKGROUND: HIV is usually associated with weight loss. World health Organization (WHO) recommends early antiretroviral (ART) initiation, but data on the progression of body mass index (BMI) in participants initiating early ART in Africa are scarce. METHODS: The Temprano randomized trial was conducted in Abidjan to assess the effectiveness of early ART and Isoniazid (INH) prophylaxis for tuberculosis in HIV-infected persons with high CD4 counts below 800 cells/mm(3) without any indication for starting ART...
February 25, 2016: AIDS Research and Therapy
https://www.readbyqxmd.com/read/27905897/cost-and-cost-effectiveness-of-tuberculosis-treatment-shortening-a-model-based-analysis
#8
G B Gomez, D W Dowdy, M L Bastos, A Zwerling, S Sweeney, N Foster, A Trajman, M A Islam, S Kapiga, E Sinanovic, G M Knight, R G White, W A Wells, F G Cobelens, A Vassall
BACKGROUND: Despite improvements in treatment success rates for tuberculosis (TB), current six-month regimen duration remains a challenge for many National TB Programmes, health systems, and patients. There is increasing investment in the development of shortened regimens with a number of candidates in phase 3 trials. METHODS: We developed an individual-based decision analytic model to assess the cost-effectiveness of a hypothetical four-month regimen for first-line treatment of TB, assuming non-inferiority to current regimens of six-month duration...
December 1, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27905500/targeting-intracellular-p-aminobenzoic-acid-production-potentiates-the-anti-tubercular-action-of-antifolates
#9
Joshua M Thiede, Shannon L Kordus, Breanna J Turman, Joseph A Buonomo, Courtney C Aldrich, Yusuke Minato, Anthony D Baughn
The ability to revitalize and re-purpose existing drugs offers a powerful approach for novel treatment options against Mycobacterium tuberculosis and other infectious agents. Antifolates are an underutilized drug class in tuberculosis (TB) therapy, capable of disrupting the biosynthesis of tetrahydrofolate, an essential cellular cofactor. Based on the observation that exogenously supplied p-aminobenzoic acid (PABA) can antagonize the action of antifolates that interact with dihydropteroate synthase (DHPS), such as sulfonamides and p-aminosalicylic acid (PAS), we hypothesized that bacterial PABA biosynthesis contributes to intrinsic antifolate resistance...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27904808/effect-of-common-and-experimental-anti-tuberculosis-treatments-on-mycobacterium-tuberculosis-growing-as-biofilms
#10
James P Dalton, Benedict Uy, Narisa Phummarin, Brent R Copp, William A Denny, Simon Swift, Siouxsie Wiles
Much is known regarding the antibiotic susceptibility of planktonic cultures of Mycobacterium tuberculosis, the bacterium responsible for the lung disease tuberculosis (TB). As planktonically-grown M. tuberculosis are unlikely to be entirely representative of the bacterium during infection, we set out to determine how effective a range of anti-mycobacterial treatments were against M. tuberculosis growing as a biofilm, a bacterial phenotype known to be more resistant to antibiotic treatment. Light levels from bioluminescently-labelled M...
2016: PeerJ
https://www.readbyqxmd.com/read/27904047/protective-effect-of-deer-bone-oil-on-cartilage-destruction-in-rats-with-monosodium-iodoacetate-mia-induced-osteoarthritis
#11
Hyeon-Son Choi, Suji Im, Je Won Park, Hyung Joo Suh
The anti-osteoarthritic activity of the methanol fraction of deer bone oil extract (DBO-M) was evaluated in interleukin (IL)-1β-inflamed primary rabbit chondrocytes and in rats with monosodium iodoacetate (MIA)-induced osteoarthritis. The active compound in DBO-M was analyzed using a direct infusion liquid chromatography quadrupole (LCQ) ion-trap electrospray ionization (ESI)-mass spectrometer (MS). DBO-M significantly suppressed the IL-1β-induced sulfated-glycosaminoglycan (s-GAG) release from chondrocyte, and lowered mRNA levels of the collagen-degrading enzymes matrix metalloproteinase (MMP)-1 and MMP-3 in a dose-dependent manner...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27903602/whole-genome-sequencing-of-mycobacterium-tuberculosis-provides-insight-into-the-evolution-and-genetic-composition-of-drug-resistant-tuberculosis-in-belarus
#12
Kurt R Wollenberg, Christopher A Desjardins, Aksana Zalutskaya, Vervara Slodovnikova, Andrew J Oler, Mariam Quiñones, Thomas Abeel, Sinead B Chapman, Michael Tartakovsky, Andrei Gabrielian, Sven Hoffner, Aliaksandr Skrahin, Bruce W Birren, Alexander Rosenthal, Alena Skrahina, Ashlee M Earl
The emergence and spread of drug resistant Mycobacterium tuberculosis (DR-TB) is a critical global health issue. Eastern Europe has some of the highest incidences of DR-TB, particularly multidrug-resistant (MDR) and extensively drug-resistant (XDR) TB. To better understand the genetic composition and evolution of MDR- and XDR-TB in the region, we sequenced and analyzed the genomes of 138 M. tuberculosis isolates from 97 patients sampled between 2010 and 2013 in Minsk, Belarus. MDR and XDR-TB isolates were significantly more likely to belong to the Beijing lineage than to the Euro-American lineage, and known resistance-conferring loci accounted for the majority of phenotypic resistance to first- and second-line drugs in MDR and XDR-TB...
November 30, 2016: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/27903467/arterio-cutaneous-fistula-associated-with-bilateral-femoral-pseudoaneurysms-caused-by-bacillus-calmette-gu%C3%A3-rin-apropos-of-a-case-and-review-of-literature
#13
Álvaro Torres-Blanco, Francisco Gómez-Palonés, Gemma Edo-Fleta
Vascular complications of intravesical instillation of bacillus Calmette-Guérin (BCG) are rare. BCG is an attenuated strain of Mycobacterium bovis (M. Bovis) that was initially developed for vaccination against tuberculosis, but it has also been used as an adjuvant treatment for bladder transitional carcinoma. We report a patient with a history of instillation of BCG two years before, who underwent surgical treatment of 2 pseudoaneurysms. The first, located in the left superficial femoral artery (SFA), was resected and the artery was ligated because he had a history of femoropopliteal occlusion...
November 26, 2016: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/27902779/differential-cytokine-gene-expression-in-granulomas-from-lungs-and-lymph-nodes-of-cattle-experimentally-infected-with-aerosolized-mycobacterium-bovis
#14
Mitchell V Palmer, Tyler C Thacker, W Ray Waters
The hallmark lesion of tuberculosis in humans and animals is the granuloma. The granuloma represents a distinct host cellular immune response composed of epithelioid macrophages, lymphocytes, and multinucleated giant cells, often surrounding a caseous necrotic core. Within the granuloma, host-pathogen interactions determine disease outcome. Factors within the granulomas such as cytokines and chemokines drive cell recruitment, activity, function and ultimately the success or failure of the host's ability to control infection...
2016: PloS One
https://www.readbyqxmd.com/read/27902737/a-comparison-of-the-sensititre-mycotb-plate-the-bactec-mgit-960-and-a-microarray-based-molecular-assay-for-the-detection-of-drug-resistance-in-clinical-mycobacterium-tuberculosis-isolates-in-moscow-russia
#15
Elena Y Nosova, Danila V Zimenkov, Anastasia A Khakhalina, Alexandra I Isakova, Ludmila Y Krylova, Marina V Makarova, Ksenia Y Galkina, Maria A Krasnova, Svetlana G Safonova, Vitaly I Litvinov, Dmitry A Gryadunov, Elena M Bogorodskaya
BACKGROUND: The goal of this study was to compare the consistency of three assays for the determination of the drug resistance of Mycobacterium tuberculosis (MTB) strains with various resistance profiles isolated from the Moscow region. METHODS: A total of 144 MTB clinical isolates with a strong bias toward drug resistance were examined using Bactec MGIT 960, Sensititre MycoTB, and a microarray-based molecular assay TB-TEST to detect substitutions in the rpoB, katG, inhA, ahpC, gyrA, gyrB, rrs, eis, and embB genes that are associated with resistance to rifampin, isoniazid, fluoroquinolones, second-line injectable drugs and ethambutol...
2016: PloS One
https://www.readbyqxmd.com/read/27901369/involvement-of-endogenous-central-hydrogen-sulfide-h2s-in-hypoxia-induced-hypothermia-in-spontaneously-hypertensive-rats
#16
João Paulo J Sabino, Renato N Soriano, Alberto F Donatti, Rodrigo Restrepo Fernandez, Marcelo Kwiatkoski, Heloísa D C Francescato, Terezila M Coimbra, Luiz G S Branco
Spontaneously hypertensive rats (SHR) display autonomic imbalance and abnormal body temperature (Tb) adjustments. Hydrogen sulfide (H2S) modulates hypoxia-induced hypothermia, but its role in SHR thermoregulation is unknown. We tested the hypothesis that SHR display peculiar thermoregulatory response to hypoxia and that endogenous H2S overproduced in the caudal nucleus of the solitary tract (NTS) of SHR modulates this response. SHR and Wistar rats were microinjected into the fourth ventricle with aminooxyacetate (AOA, H2S-synthezing enzyme inhibitor) or sodium sulfide (Na2S, H2S donor) and exposed to normoxia (21% inspired O2) or hypoxia (10% inspired O2, 30 min)...
September 6, 2016: Canadian Journal of Physiology and Pharmacology
https://www.readbyqxmd.com/read/27901051/mycobacterium-avium-mav2054-protein-induces-macrophage-apoptosis-by-targeting-mitochondria-and-reduces-intracellular-bacterial-growth
#17
Kang-In Lee, Jake Whang, Han-Gyu Choi, Yeo-Jin Son, Haet Sal Jeon, Yong Woo Back, Hye-Soo Park, Seungwha Paik, Jeong-Kyu Park, Chul Hee Choi, Hwa-Jung Kim
Mycobacterium avium complex induces macrophage apoptosis. However, the M. avium components that inhibit or trigger apoptosis and their regulating mechanisms remain unclear. We recently identified the immunodominant MAV2054 protein by fractionating M. avium culture filtrate protein by multistep chromatography; this protein showed strong immuno-reactivity in M. avium complex pulmonary disease and in patients with tuberculosis. Here, we investigated the biological effects of MAV2054 on murine macrophages. Recombinant MAV2054 induced caspase-dependent macrophage apoptosis...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27900592/tuberculosis-among-incarcerated-hispanic-persons-in-the-united-states-1993-2014
#18
Godwin Mindra, Jonathan M Wortham, Maryam B Haddad, Jorge L Salinas, Krista M Powell, Lori R Armstrong
We examined the National tuberculosis surveillance system to describe Hispanic persons who were incarcerated at time of tuberculosis (TB) diagnosis and to compare their characteristics with those of non-Hispanic incarcerated TB patients. After declines between 1993 and 2002, the annual proportion of Hispanic TB patients who were incarcerated grew from 4.9% in 2003 to 8.4% in 2014. During 2003-2014, 19% of incarcerated US-born TB patients were Hispanic, and 86% of the foreign-born were Hispanic. Most incarcerated TB patients were in local jails, but about a third of all foreign-born Hispanics were in the facility category that includes Immigration and Customs Enforcement detention centers...
November 29, 2016: Journal of Immigrant and Minority Health
https://www.readbyqxmd.com/read/27899559/division-of-labor-among-mycobacterium-smegmatis-rnase-h-enzymes-rnase-h1-activity-of-rnha-or-rnhc-is-essential-for-growth-whereas-rnhb-and-rnha-guard-against-killing-by-hydrogen-peroxide-in-stationary-phase
#19
Richa Gupta, Debashree Chatterjee, Michael S Glickman, Stewart Shuman
RNase H enzymes sense the presence of ribonucleotides in the genome and initiate their removal by incising the ribonucleotide-containing strand of an RNA:DNA hybrid. Mycobacterium smegmatis encodes four RNase H enzymes: RnhA, RnhB, RnhC and RnhD. Here, we interrogate the biochemical activity and nucleic acid substrate specificity of RnhA. We report that RnhA (like RnhC characterized previously) is an RNase H1-type magnesium-dependent endonuclease with stringent specificity for RNA:DNA hybrid duplexes. Whereas RnhA does not incise an embedded mono-ribonucleotide, it can efficiently cleave within tracts of four or more ribonucleotides in duplex DNA...
November 28, 2016: Nucleic Acids Research
https://www.readbyqxmd.com/read/27898665/extending-contact-tracing-into-the-community-within-a-50-metre-radius-of-an-index-tuberculosis-patient-using-xpert-mtb-rif-in-urban-pakistan-did-it-increase-case-detection
#20
Razia Fatima, Ejaz Qadeer, Aashifa Yaqoob, Mahboob Ul Haq, Suman S Majumdar, Hemant D Shewade, Robert Stevens, Jacob Creswell, Nasir Mahmood, Ajay M V Kumar
BACKGROUND: Currently, only 62% of incident tuberculosis (TB) cases are reported to the national programme in Pakistan. Several innovative interventions are being recommended to detect the remaining 'missed' TB cases. One such intervention involved expanding contact investigation to the community using the Xpert MTB/RIF test. METHODS: This was a before and after intervention study involving retrospective record review. Passive case finding and household contact investigation was routinely done in the pre-intervention period July 2011-June 2013...
2016: PloS One
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