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https://www.readbyqxmd.com/read/29436711/evidence-for-dispensability-of-protein-kinase-r-in-host-control-of-tuberculosis
#1
Shashirekha Mundhra, Ruslana Bryk, Natalie Hawryluk, Tuo Zhang, Xiuju Jiang, Carl F Nathan
Genetic deficiency of protein kinase R (PKR) in mice was reported to enhance macrophage activation in vitro in response to interferon-γ (IFNγ) and to reduce the burden of Mycobacterium tuberculosis (Mtb) in vivo (Wu et al. PloS One. 2012 7:e30512). Consistent with this, treatment of wild-type (WT) macrophages in vitro with a novel PKR inhibitor (Bryk et al., Bioorg. Med. Chem. Lett. 2011 21:4108-4114) also enhanced IFNγ-dependent macrophage activation (Wu et al. PloS One. 2012 7:e30512). Here we show that co-treatment with IFNγ and a new PKR inhibitor identified herein to be highly but not completely selective likewise induced macrophages to produce more reactive nitrogen intermediates (RNI) and tumor necrosis factor alpha (TNFα) and less interleukin 10 (IL-10) than seen with IFNγ alone...
February 13, 2018: European Journal of Immunology
https://www.readbyqxmd.com/read/29432913/effects-of-fluconazole-on-the-clinical-outcome-and-immune-response-in-fungal-co-infected-tuberculosis-patients
#2
Xiaojuan Ren, Wei Liu, Yi Liu
With overuse of the broad-spectrum antibiotics, the pulmonary fungal infection increasingly becomes the most common complication associated with senile pulmonary tuberculosis (TB) and attracts intensive attentions from clinicians. Here we presented the retrospective analysis of impact of fluconazole treatment on the clinical outcome and immune response in fungal co-infected tuberculosis patients. A randomized, double-blind, placebo-controlled trial of fluconazole (100 mg per day for consecutive weeks) in fungal-positive senile tuberculosis patients was conducted in our hospital...
February 9, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29427966/do-higher-cut-off-values-for-tuberculin-skin-test-increase-the-specificity-and-diagnostic-agreement-with-interferon-gamma-release-assays-in-immunocompromised-bacillus-calmette-gu%C3%A3-rin-vaccinated-patients
#3
Serhat Erol, Fatma Arslan Ciftci, Aydin Ciledag, Akin Kaya, Ozlem Ozdemir Kumbasar
PURPOSE: Immunocompromised patients with latent tuberculosis infection (LTBI) are at high risk of progression to active tuberculosis. Detection and treatment of LTBI in this group of patients are very important to control active tuberculosis. Tuberculin skin test (TST) and interferon gamma release assays (IGRAs) are two methods for detection of LTBI. Diagnostic agreement between two tests are poor especially in Bacillus Calmette-Guérin (BCG) vaccinated immunocompromised patients. In this study, we tried to figure out if the use of a higher cut-off for TST increases diagnostic agreement with IGRAs and TST specificity and or not...
February 7, 2018: Advances in Medical Sciences
https://www.readbyqxmd.com/read/29422794/asian-organization-for-crohn-s-and-colitis-and-asia-pacific-association-of-gastroenterology-consensus-on-tuberculosis-infection-in-patients-with-inflammatory-bowel-disease-receiving-anti-tumor-necrosis-factor-treatment-part-2-management
#4
REVIEW
Dong Il Park, Tadakazu Hisamatsu, Minhu Chen, Siew Chien Ng, Choon Jin Ooi, Shu Chen Wei, Rupa Banerjee, Ida Normiha Hilmi, Yoon Tae Jeen, Dong Soo Han, Hyo Jong Kim, Zhihua Ran, Kaichun Wu, Jiaming Qian, Pin-Jin Hu, Katsuyoshi Matsuoka, Akira Andoh, Yasuo Suzuki, Kentaro Sugano, Mamoru Watanabe, Toshifumi Hibi, Amarender S Puri, Suk-Kyun Yang
Because anti-tumor necrosis factor (anti-TNF) therapy has become increasingly popular in many Asian countries, the risk of developing active tuberculosis (TB) among anti-TNF users may raise serious health problems in this region. Thus, the Asian Organization for Crohn's and Colitis and the Asia Pacific Association of Gastroenterology have developed a set of consensus statements about risk assessment, detection and prevention of latent TB infection, and management of active TB infection in patients with inflammatory bowel disease (IBD) receiving anti-TNF treatment...
January 2018: Intestinal Research
https://www.readbyqxmd.com/read/29422793/asian-organization-for-crohn-s-and-colitis-and-asia-pacific-association-of-gastroenterology-consensus-on-tuberculosis-infection-in-patients-with-inflammatory-bowel-disease-receiving-anti-tumor-necrosis-factor-treatment-part-1-risk-assessment
#5
REVIEW
Dong Il Park, Tadakazu Hisamatsu, Minhu Chen, Siew Chien Ng, Choon Jin Ooi, Shu Chen Wei, Rupa Banerjee, Ida Normiha Hilmi, Yoon Tae Jeen, Dong Soo Han, Hyo Jong Kim, Zhihua Ran, Kaichun Wu, Jiaming Qian, Pin-Jin Hu, Katsuyoshi Matsuoka, Akira Andoh, Yasuo Suzuki, Kentaro Sugano, Mamoru Watanabe, Toshifumi Hibi, Amarender S Puri, Suk-Kyun Yang
Because anti-tumor necrosis factor (anti-TNF) therapy has become increasingly popular in many Asian countries, the risk of developing active tuberculosis (TB) among anti-TNF users may raise serious health problems in this region. Thus, the Asian Organization for Crohn's and Colitis and the Asia Pacific Association of Gastroenterology have developed a set of consensus statements about risk assessment, detection and prevention of latent TB infection, and management of active TB infection in patients with inflammatory bowel disease (IBD) receiving anti-TNF treatment...
January 2018: Intestinal Research
https://www.readbyqxmd.com/read/29406278/association-of-tnf-%C3%AE-il-10-and-il-6-promoter-polymorphisms-in-pulmonary-tuberculosis-patients-and-their-household-contacts-of-younger-age-group
#6
Lavanya Joshi, Lakshmi Kiran Chelluri, Vijayalakshmi Valluri, Sumanlatha Gaddam
Single nucleotide polymorphisms (SNPs) of cytokine genes have been found to be involved in the clinical outcome of Tuberculosis. The present study was aimed to identify the high risk genotypes in Tuberculosis patients and their household contacts. A total of 490 subjects were studied which includes 150 active pulmonary tuberculosis patients (APTB), 190 household contacts (HHC) and 150 healthy controls (HC). The SNPs of TNF-α (-308A/G), IL-10(-1082G/A) and IL-6(-174G/C) were performed by ARMs PCR. The IL-10 GA genotype showed significant association in APTB and HHC and was 2...
February 2018: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/29391775/tuberculosis-and-viral-hepatitis-infection-in-eastern-europe-asia-and-latin-america-impact-of-tumor-necrosis-factor-%C3%AE-inhibitors-in-clinical-practice
#7
REVIEW
Yi-Hsing Chen, Hellen Mds de Carvalho, Umut Kalyoncu, Lyndon John Q Llamado, Gaston Solano, Ron Pedersen, Galina Lukina, Juan J Lichauco, Radu S Vasilescu
Tumor necrosis factor-α (TNF-α) inhibitors are increasingly becoming the standard of care for treating a number of inflammatory diseases. However, treatment with TNF-α inhibitors carries an inherent risk of compromising the immune system, resulting in an increased susceptibility to infections and malignancies. This increased risk of infection is of particular concern in Asia, Eastern Europe, and Latin America where tuberculosis (TB) and viral hepatitis are endemic. In this brief review, we examine the literature and review the impact of TNF-α inhibitors on the incidence and the reactivation of latent disease with respect to TB, hepatitis C infection, and hepatitis B infection...
2018: Biologics: Targets & Therapy
https://www.readbyqxmd.com/read/29388150/rv0646c-an-esterase-from-m-tuberculosis-up-regulates-the-host-immune-response-in-thp-1-macrophages-cells
#8
Ruchi Rastogi, Arbind Kumar, Jagdeep Kaur, Varinder Saini, Jasbinder Kaur, Archana Bhatnagar
The genome sequence of Mycobacterium tuberculosis revealed the presence of several hydrolases involved in lipid metabolism including the members of Lip gene family. Rv0646c (LipG) is one of them. It is annotated as putative esterase/lipase because of the presence of consensus sequence 'GXSXG.' The gene was cloned, expressed, and purified in E. coli. It showed 22 U/mg specific activity with pNP-butyrate as a preferred substrate. However, it actively worked on substrates with short chain. The enzyme was optimally active at 50 °C/pH 8...
January 31, 2018: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29386556/recombinant-mtb9-8-of-mycobacterium-bovis-stimulates-tnf-%C3%AE-and-il-1%C3%AE-secretion-by-raw264-7-macrophages-through-activation-of-nf-%C3%AE%C2%BAb-pathway-via-tlr2
#9
Shuqing Liu, Hong Jia, Shaohua Hou, Ting Xin, Xiaoyu Guo, Gaimei Zhang, Xintao Gao, Ming Li, Wuyang Zhu, Hongfei Zhu
The Mtb9.8 antigenic protein of Mycobacterium bovis/Mycobacterium tuberculosis has been identified as a target of the T-cell response. However, the interaction of Mtb9.8 with Toll-like receptors (TLRs) and the relevant signaling pathways have not been fully clarified. In this study, recombinant Mtb9.8 (rMtb9.8) derived from M. bovis-stimulated RAW264.7 cells initiated the secretion of TNF-α and IL-1β in a dose-dependent manner. Blocking assays show that TLR2-neutralizing antibody decreases the production of TNF-α and IL-1β...
January 31, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29373700/the-role-of-klrg1-in-human-cd4-t-cell-immunity-against-tuberculosis
#10
Zhidong Hu, Hui-Min Zhao, Chun-Ling Li, Xu-Hui Liu, Daniel Barkan, Douglas B Lowrie, Shui-Hua Lu, Xiao-Yong Fan
Background: KLRG1 is a marker of terminally differentiated CD8+ T cells in viral infection, but its role in human tuberculosis infection remains elusive. Methods: A set of tuberculosis cohorts was designed and the expression profiles and functions of KLRG1+CD4+ T cells were determined with and without antibody blocking. Results: KLRG1 expression on CD4+ T cells was significantly increased in active tuberculosis patients compared with healthy controls and non-tuberculosis patients...
January 24, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29362230/contrasting-function-of-structured-n-terminal-and-unstructured-c-terminal-segments-of-mycobacterium-tuberculosis-ppe37-protein
#11
Javeed Ahmad, Aisha Farhana, Rita Pancsa, Simran Kaur Arora, Alagiri Srinivasan, Anil Kumar Tyagi, Madan Mohan Babu, Nasreen Zafar Ehtesham, Seyed Ehtesham Hasnain
Pathogens frequently employ eukaryotic linear motif (ELM)-rich intrinsically disordered proteins (IDPs) to perturb and hijack host cell networks for a productive infection. Mycobacterium tuberculosis has a relatively high percentage of IDPs in its proteome, the significance of which is not known. The Mycobacterium-specific PE-PPE protein family has several members with unusually high levels of structural disorder and disorder-promoting Ala/Gly residues. PPE37 protein, a member of this family, carries an N-terminal PPE domain capable of iron binding, two transmembrane domains, and a disordered C-terminal segment harboring ELMs and a eukaryotic nuclear localization signal (NLS)...
January 23, 2018: MBio
https://www.readbyqxmd.com/read/29352446/mycobacterium-marinum-infection-in-zebrafish-and-microglia-imitates-the-early-stage-of-tuberculous-meningitis
#12
Zhan Chen, Xiao-Yi Shao, Chao Wang, Min-Hui Hua, Cheng-Niu Wang, Xin Wang, Qian-Jin Wang, Jin-Yi Yao, Yi-Hui Fan, Yong-Wei Qin
Mycobacterium tuberculosis (M. tuberculosis) invading and activating microglia causes the most serious subtypes of tuberculosis called tubercular meningitis. However, the developmental process of tubercular meningitis, especially the early phase, is poorly understood due to lacking well-established and well-accepted visible models in vitro and in vivo. Here, consistent with one recent report, we found Mycobacterium marinum (M. marinum) invade the zebrafish brain and subsequently cause granuloma-like structures...
January 20, 2018: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29345364/the-n-terminal-peptide-moiety-of-the-mycobacterium-tuberculosis-19-kda-lipoprotein-harbors-rp105-agonistic-properties
#13
Thomas E Schultz, Karl-Heinz Wiesmüller, Megan Lucas, Karen M Dobos, Alan G Baxter, Antje Blumenthal
Radioprotective 105 kDa (RP105, CD180) is a member of the Toll-like receptor (TLR) family that interacts with TLR2 and facilitates recognition of mature lipoproteins expressed by Mycobacterium tuberculosis and Mycobacterium bovis BCG. In this study, we used synthetic lipopeptide analogs of the M. tuberculosis 19 kDa lipoprotein to define structural characteristics that promote RP105-mediated host cell responses. A tripalmitoylated lipopeptide composed of the first 16 N-terminal amino acids of the M. tuberculosis 19 kDa lipoprotein induced RP105-dependent TNF and IL-6 production by macrophages...
January 9, 2018: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/29345081/screening-for-latent-tuberculosis-infection-among-patients-with-rheumatoid-arthritis-in-the-era-of-biologics-and-targeted-synthetic-disease-modifying-anti-rheumatic-drugs-in-india-a-high-burden-tb-country-the-importance-of-mantoux-and-quantiferon-tb-gold-tests
#14
Anand N Malaviya, Vishal K Aggarwal, Roopa Rawat, Sadhana Baghel, Ravita Thakran, Qamar Zaheer, Shriram Garg, Sanjiv Kapoor
AIM: To test the validity of an augmented tuberculosis skin test (a-TST) combined with Quantiferon TB-gold® (QFTG) test for the screening of latent tuberculosis infection (LTBI) in patients with rheumatoid arthritis (RA) being considered for treatment with biologic disease-modifying anti-rheumatic drugs or targeted synthetic disease-modifying anti-rheumatic drugs. METHOD: Standard TST using 1 tuberculin unit (TU) of purified protein derivative (PPD, RT23 strain) was carried out...
January 17, 2018: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/29325881/rv2204c-rv0753c-and-rv0009-antigens-specific-t-cell-responses-in-latent-and-active-tb-a-flow-cytometry-based-analysis
#15
Balaji Pathakumari, Santhi Devasundaram, Prabhavathi Maddineni, Alamelu Raja
High global prevalence of latent TB infection (LTBI) is a key challenge in distinguishing patients with active pulmonary TB (PTB) from those with LTBI. The functional profile of CD4+ and CD8+ T cell cytokines produced as a response to Mycobacterium tuberculosis antigens vary during the course of tuberculosis (TB) infection. We evaluated antigen-specific CD4+ and CD8+ T cell cytokine response after overnight in vitro stimulation of peripheral blood with mycobacterial antigens ESAT-6, CFP-10, Rv2204c, Rv0753c and Rv0009 by flow cytometry...
December 6, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29325465/prevalence-of-positive-quantiferon-gold-in-tube-testing-in-hidradenitis-suppurativa
#16
Tina Boortalary, Kanchan Misra, Sean McNish, Derek Jones, Victoria K Shanmugam
AIM: 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 HS...
January 22, 2018: Journal of Dermatological Treatment
https://www.readbyqxmd.com/read/29317823/european-perspective-on-the-management-of-rheumatoid-arthritis-clinical-utility-of-tofacitinib
#17
REVIEW
Paweł Kawalec, Katarzyna Śladowska, Iwona Malinowska-Lipień, Tomasz Brzostek, Maria Kózka
Xeljanz ® (tofacitinib) is an oral small-molecule inhibitor that reversibly inhibits Janus-activated kinase (JAK)-dependent cytokine signaling, thus reducing inflammation. As a result of these mechanisms, effects on the immune system such as a moderate decrease in the total lymphocyte count, a dose-dependent decrease in natural killer (NK) cell count, and an increase in B-cell count have been observed. Therefore, tofacitinib provides an innovative approach to modulating the immune and inflammatory responses in patients with rheumatoid arthritis (RA), which is especially important in individuals who do not respond to tumor necrosis factor inhibitors or show a loss of response over time...
2018: Therapeutics and Clinical Risk Management
https://www.readbyqxmd.com/read/29311492/innate-immunity-mediated-by-dendritic-cells-macrophages-plays-a-central-role-in-the-early-period-in-tumor-treatment-using-gene-of-mycobacterium-tuberculosis-antigen
#18
Takahiro Ushigusa, Yoshiyuki Koyama, Tomoko Ito, Kenichi Watanabe, James K Chambers, Aya Hasegawa, Kazuyuki Uchida, Ryoji Kanegi, Shingo Hatoya, Toshio Inaba, Kikuya Sugiura
By using a complex of DNA, polyethylenimine and chondroitin sulfate, the in vivo transfection of early secretory antigenic target-6 (ESAT-6) gene into tumor cells was found to cause significant suppression of the tumor growth. In order to apply the method in clinical cancer treatment in dogs and cats, mechanisms underlying the suppressive effects were investigated in a tumor-bearing mouse model. The transfection efficiency was only about 10%, but the transfection of ESAT-6 DNA nevertheless induced systemic immune responses against ESAT-6...
January 1, 2018: Journal of Veterinary Medical Science
https://www.readbyqxmd.com/read/29298876/correlation-between-mbl-cd14-and-tnf-%C3%AE-gene-polymorphisms-with-susceptibility-to-spinal-tuberculosis-in-chinese-population
#19
Mingfeng Zheng, Shiyuan Shi, Wei Wei, Qi Zheng, Yifan Wang, Xiaozhang Ying, Di Lu
Objective: This study investigated the clinical significances of mannose-binding lectin2(MBL2), cluster of differentiation 14(CD14) and tumor necrosis factor- α (TNF-α) gene polymorphisms in spinal tuberculosis(TB) patients in Chinese population. Methods: A total of 240 patients with spinal TB were enrolled in this study from May 2013 to August 2016 at Hangzhou Red Cross Hospital. 150 age- and sex-matched healthy subjectes were enrolled as controls. The genomic DNA was extracted from peripheral blood of all subjects, and the MBL2, CD14 and TNF-α gene polymorphisms were detected by direct DNA sequencing...
January 3, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29284895/the-effects-of-aloe-vera-on-tnf-a-levels-the-percentage-of-nk-cells-and-th-17-cells-in-rat-that-received-izoniazid-and-rifampycin
#20
Herin Mawarti, Mukhamad Rajin, Zulfikar Asumta
Background: The present study was undertaken to investigate the hepatoprotective effect of Aloe vera against side effect of antituberculosis drug. Material and methods: Twenty-five rats will be divided into five groups, namely the control group (without any treatment), the group of rats treated with anti-tuberculosis drugs, and a group of rats were treated antituberculosis drugs and got Aloe vera extract at a dose of 40; 80; and 120 mg/kg body weight. Antituberculosis drugs are isoniazid and rifampicin a dose of 50 mg/kg body weight...
October 2017: Medical Archives
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