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macrophage tuberculosis

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https://www.readbyqxmd.com/read/28106119/early-secreted-antigenic-target-of-6-kda-of-mycobacterium-tuberculosis-stimulates-il-6-production-by-macrophages-through-activation-of-stat3
#1
Bock-Gie Jung, Xisheng Wang, Na Yi, Justin Ma, Joanne Turner, Buka Samten
As early secreted antigenic target of 6 kDa (ESAT-6) of Mycobacterium tuberculosis (Mtb) is an essential virulence factor and macrophages are critical for tuberculosis infection and immunity, we studied ESAT-6 stimulated IL-6 production by macrophages. ESAT-6 stimulated significantly higher IL-6 secretion by murine bone marrow derived macrophages (BMDM) compared to culture filtrate protein 10 kDa (CFP10) and antigen 85A. Polymyxin B, an LPS blocker, did not affect ESAT-6 stimulated macrophage IL-6 production...
January 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28103313/mycobacterium-marinum-degrades-both-triacylglycerols-and-phospholipids-from-its-dictyostelium-host-to-synthesise-its-own-triacylglycerols-and-generate-lipid-inclusions
#2
Caroline Barisch, Thierry Soldati
During a tuberculosis infection and inside lipid-laden foamy macrophages, fatty acids (FAs) and sterols are the major energy and carbon source for Mycobacterium tuberculosis. Mycobacteria can be found both inside a vacuole and the cytosol, but how this impacts their access to lipids is not well appreciated. Lipid droplets (LDs) store FAs in form of triacylglycerols (TAGs) and are energy reservoirs of prokaryotes and eukaryotes. Using the Dictyostelium discoideum/Mycobacterium marinum infection model we showed that M...
January 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28097645/bacterial-subversion-of-camp-signalling-inhibits-cathelicidin-expression-which-is-required-for-innate-resistance-to-mycobacterium-tuberculosis
#3
Shashank Gupta, Kathryn Winglee, Richard Gallo, William R Bishai
Antimicrobial peptides such as cathelicidins are an important component of innate immune defence against inhaled microorganisms and have demonstrated antimicrobial activity against Mycobacterium tuberculosis with in vitro models. Despite this, little is known about the regulation and expression of cathelicidin during tuberculosis in vivo. We sought to determine whether the cathelicidin-related antimicrobial peptide (Cramp) gene, the murine functional homologue of the human cathelicidin gene (CAMP or LL-37), is required for regulating protective immunity during M...
January 18, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28095608/esx-1-and-phthiocerol-dimycocerosates-of-mycobacterium-tuberculosis-act-in-concert-to-cause-phagosomal-rupture-and-host-cell-apoptosis
#4
Jacques Augenstreich, Ainhoa Arbues, Roxane Simeone, Evert Haanappel, Alice Wegener, Fadel Sayes, Fabien Le Chevalier, Christian Chalut, Wladimir Malaga, Christophe Guilhot, Roland Brosch, Catherine Astarie-Dequeker
Although phthiocerol dimycocerosates (DIM) are major virulence factors of Mycobacterium tuberculosis (Mtb), the causative agent of human tuberculosis, little is known about their mechanism of action. Localized in the outer membrane of mycobacterial pathogens, DIM are predicted to interact with host cell membranes. Interaction with eukaryotic membranes is a property shared with another virulence factor of Mtb, the early secretory antigenic target EsxA (also known as ESAT-6). This small protein, which is secreted by the type VII secretion system ESX-1 (T7SS/ESX-1), is involved in phagosomal rupture and cell death induced by virulent mycobacteria inside host phagocytes...
January 17, 2017: Cellular Microbiology
https://www.readbyqxmd.com/read/28092373/chronic-signaling-via-the-metabolic-checkpoint-kinase-mtorc1-induces-macrophage-granuloma-formation-and-marks-sarcoidosis-progression
#5
Monika Linke, Ha Thi Thanh Pham, Karl Katholnig, Thomas Schnöller, Anne Miller, Florian Demel, Birgit Schütz, Margit Rosner, Boris Kovacic, Nyamdelger Sukhbaatar, Birgit Niederreiter, Stephan Blüml, Peter Kuess, Veronika Sexl, Mathias Müller, Mario Mikula, Wolfram Weckwerth, Arvand Haschemi, Martin Susani, Markus Hengstschläger, Michael J Gambello, Thomas Weichhart
The aggregation of hypertrophic macrophages constitutes the basis of all granulomatous diseases, such as tuberculosis or sarcoidosis, and is decisive for disease pathogenesis. However, macrophage-intrinsic pathways driving granuloma initiation and maintenance remain elusive. We found that activation of the metabolic checkpoint kinase mTORC1 in macrophages by deletion of the gene encoding tuberous sclerosis 2 (Tsc2) was sufficient to induce hypertrophy and proliferation, resulting in excessive granuloma formation in vivo...
January 16, 2017: Nature Immunology
https://www.readbyqxmd.com/read/28091914/altered-liver-proteoglycan-glycosaminoglycan-structure-as-a-manifestation-of-extracellular-matrix-remodeling-upon-bcg-induced-granulomatosis-in-mice
#6
L B Kim, V A Shkurupy, A N Putyatina
Experimental BCG-induced granulomatosis in mice was used to study changes in the dynamics of individual liver proteoglycan components reflecting phasic extracellular matrix remodeling, determined by the host-parasite interaction and associated with granuloma development. In the early BCG-granulomatosis period, the increase in individual proteoglycan components promotes granuloma formation, providing conditions for mycobacteria adhesion to host cells, migration of phagocytic cells from circulation, and cell-cell interaction leading to granuloma development and fibrosis...
January 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28087945/innate-immune-responses-to-tuberculosis
#7
Jeffrey S Schorey, Larry S Schlesinger
Tuberculosis remains one of the greatest threats to human health. The causative bacterium, Mycobacterium tuberculosis, is acquired by the respiratory route. It is exquisitely adapted to humans and is a prototypic intracellular pathogen of macrophages, with alveolar macrophages being the primary conduit of infection and disease. However, M. tuberculosis bacilli interact with and are affected by several soluble and cellular components of the innate immune system which dictate the outcome of primary infection, most commonly a latently infected healthy human host, in whom the bacteria are held in check by the host immune response within the confines of tissue granuloma, the host histopathologic hallmark...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28076390/il-37-confers-protection-against-mycobacterial-infection-involving-suppressing-inflammation-and-modulating-t-cell-activation
#8
Haipeng Liu, Ruijuan Zheng, Peng Wang, Hua Yang, Xin He, Qun Ji, Wenjuan Bai, Hao Chen, Jianxia Chen, Wenxia Peng, Siyu Liu, Zhonghua Liu, Baoxue Ge
Interleukin-37 (IL-37), a novel member of the IL-1 family, plays fundamental immunosuppressive roles by broadly reducing both innate inflammation and acquired immunity, but whether it is involved in the pathogenesis of tuberculosis (TB) has not been clearly elucidated. In this study, single nucleotide polymorphism (SNP) analysis demonstrated an association of the genetic variant rs3811047 of IL-37 with TB susceptibility. In line with previous report, a significant elevated IL-37 abundance in the sera and increased expression of IL-37 protein in the peripheral blood mononuclear cells (PBMC) were observed in TB patients in comparison to healthy controls...
2017: PloS One
https://www.readbyqxmd.com/read/28071726/the-ppe2-protein-of-mycobacterium-tuberculosis-translocates-to-host-nucleus-and-inhibits-nitric-oxide-production
#9
Khalid Hussain Bhat, Shruti Srivastava, Sandeep Kumar Kotturu, Sudip Ghosh, Sangita Mukhopadhyay
Mycobacterium tuberculosis, the bacterium that causes tuberculosis, is one of the most successful pathogens of humans. It has evolved several adaptive skills and evasion mechanisms to hijack the immunologically educated host to suit its intracellular lifestyle. Here, we show that one of the unique PPE family member proteins of M. tuberculosis, PPE2, can limit nitric oxide (NO) production by inhibiting inos gene transcription. PPE2 protein has a leucine zipper DNA-binding motif and a functional nuclear localization signal...
January 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28069816/the-interaction-of-the-cd43-sialomucin-with-the-mycobacterium-tuberculosis-cpn60-2-chaperonin-mediates-macrophage-tnf-%C3%AE-production
#10
Alvaro Torres-Huerta, Tomas Villaseñor, Angel Flores-Alcantar, Cristina Parada, Estefanía Alemán-Navarro, Clara Espitia, Gustavo Pedraza-Alva, Yvonne Rosenstein
Mycobacterium tuberculosis is the causal agent of tuberculosis. TNF-α, TGF-β and IFN-γ secreted by activated macrophages and lymphocytes are considered essential to contain Mycobacterium tuberculosis infection. The CD43 sialomucin has been reported to act as a receptor for bacilli through its interaction with the chaperonin Cpn60.2, facilitating mycobacteria-macrophage contact. We report here that Cpn60.2 induces both THP-1 cells and bone marrow-derived macrophages (BMMs) to produce TNF-α and that this production is CD43 dependent...
January 9, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28061952/anti-mycobacterial-function-of-macrophages-is-impaired-in-a-diet-induced-model-of-type-2-diabetes
#11
Md Abdul Alim, Suchandan Sikder, Tahnee L Bridson, Catherine M Rush, Brenda L Govan, Natkunam Ketheesan
Type 2 diabetes (T2D) is one of the major risk factors for tuberculosis (TB). In this study, a diet induced murine model of T2D (DIMT2D) was developed and characterized in the context of metabolic, biochemical and histopathological features following diet intervention. Mycobacterial susceptibility was investigated using Mycobacterium fortuitum as a surrogate. Phagocytic capability of alveolar macrophages and resident peritoneal macrophages were determined by in vitro assays using mycolic acid coated beads and M...
January 2017: Tuberculosis
https://www.readbyqxmd.com/read/28061949/mycobacterium-tuberculosis-rv0560c-is-not-essential-for-growth-in%C3%A2-vitro-or-in-macrophages
#12
Rachel Kokoczka, Dorothée L Schuessler, Julie V Early, Tanya Parish
Mycobacterium tuberculosis Rv0560c, a putative benzoquinone methyl transferase, is heavily induced in response to salicylate exposure. It has some similarity to Escherichia coli UbiG, although its role in ubiquinone or menaquinone synthesis is not clear, since M. tuberculosis is not known to produce ubiquinone. We constructed an unmarked in-frame deletion of Rv0560c in M. tuberculosis to determine its role in vitro. Deletion of Rv0560c in M. tuberculosis had no effect on growth in medium containing salicylate or in its ability to grow in macrophages...
January 2017: Tuberculosis
https://www.readbyqxmd.com/read/28052847/subcellular-partitioning-and-intra-macrophage-selectivity-of-antimicrobial-compounds-against-mycobacterium-tuberculosis
#13
Michael D Schump, Douglas M Fox, Carolyn R Bertozzi, Lee W Riley
The efficacy of antimicrobial drugs against Mycobacterium tuberculosis (Mtb), an intracellular bacterial pathogen, is generally first established by testing compounds against bacteria in axenic culture. However, inside of infected macrophages bacteria encounter an environment which differs substantially from broth culture and are subject to important host-dependent pharmacokinetic phenomena which modulate drug activity. Here we describe how pH dependent partitioning drives asymmetric antimicrobial drug distribution in Mtb infected macrophages...
January 4, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28050854/saxifragifolin-d-attenuates-phagosome-maturation-arrest-in-mycobacterium-tuberculosis-infected-macrophages-via-an-ampk-and-vps34-dependent-pathway
#14
Jia Zhou, Rui Xu, Xian-Zhi Du, Xiang-Dong Zhou, Qi Li
Saxifragifolin D (SD), a traditional Chinese medicine, is a pentacyclic triterpenoid compound first isolated from Androsace umbellata. Various plant triterpenoids have been reported to exhibit antitubercular activity. In this study, THP-1-derived macrophages were infected with an attenuated M. tuberculosis (M.tb) strain, H37Ra. Intracellular replication of M.tb was evaluated by counting the colonies after 4 weeks of incubation. The results indicated that SD treatment reduced the intracellular replication of M...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28049128/immune-reconstitution-inflammatory-syndrome-associated-with-pulmonary-pathogens
#15
REVIEW
Radha Gopal, Rekha R Rapaka, Jay K Kolls
Immune reconstitution inflammatory syndrome (IRIS) is an exaggerated immune response to a variety of pathogens in response to antiretroviral therapy-mediated recovery of the immune system in HIV-infected patients. Although IRIS can occur in many organs, pulmonary IRIS, associated with opportunistic infections such as Mycobacterium tuberculosis and Pneumocystis jirovecii, is particularly associated with high morbidity and mortality. The pathology of IRIS is associated with a variety of innate and adaptive immune factors, including CD4(+) T-cells, CD8(+) T-cells, γδ T-cells, natural killer cells, macrophages, the complement system and surfactant proteins, Toll-like receptors and pro-inflammatory cytokines and chemokines...
January 2017: European Respiratory Review: An Official Journal of the European Respiratory Society
https://www.readbyqxmd.com/read/28043634/mycobacterial-excretory-secretory-31-protein-with-serine-protease-and-lipase-activities-an-immunogen-and-drug-target-against-tuberculosis-infection
#16
Bhaskar C Harinath
OBJECTIVE/BACKGROUND: Tuberculosis (TB) has been declared as a global emergency by the World Health Organization in 1993 and still remains one of the world's biggest threats. Worldwide, 9.6 million people have been estimated to have fallen ill with TB in 2014: 5.4 million men, 3.2 million women, and 1.0 million children. To reduce this burden, detection and treatment gaps must be addressed and new tools developed (Global TB report 2015). METHODS: Seroreactivity of the purified excretory secretory (ES) antigens ES-31, ES-43, ES-41, and ES-6 have been assessed in pulmonary TB (fresh, relapse, chronic, and latent), extrapulmonary TB, and in human immunodeficiency virus-TB coinfection...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043589/tuberculosis-in-slaughtered-cattle-and-workers-in-some-abattoirs-of-baghdad-governorate
#17
A N Al-Thwani, M S Al-Mashhadani
OBJECTIVE/BACKGROUND: Tuberculosis (the white plague) is regarded as one of the most widespread infectious diseases and continues to be a leading cause of death and the most prominent public health problem worldwide. It is caused by Mycobacterium tuberculosis complex, which refers to a group of seven species; one of them known as Mycobacterium bovis-the cause of bovine-type tuberculosis-has an exceptionally wide host range. It infects cattle, humans, goats, cats, dogs, buffalo, and deer...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043581/common-features-of-tuberculosis-and-sarcoidosis
#18
Esmaeil Mortaz, Mohammad Reza Masjedi, Atefeh Abedini, Soheila Matroodi, Arda Kiani, Dina Soroush, Ian M Adcock
Tuberculosis (TB) is a disease caused by Mycobacterium tuberculosis. Despite the availability of novel therapeutic approaches, TB is considered as one of the leading causes of death due to infectious diseases worldwide. Alveolar macrophages are the first line of defense against M. tuberculosis; they ingest and sequester the bacilli within granulomatous structures. Control and resolution of the infection requires activated T lymphocytes as well as Th1 cytokines. There are two forms of TB: active TB and latent TB...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043576/immunohistochemical-findings-of-the-granulomatous-reaction-associated-with-tuberculosis
#19
Shirin Karimi, Masoud Shamaei, Mihan Pourabdollah, Makan Sadr, Mehrdad Karbasi, Arda Kiani, Moslem Bahadori
OBJECTIVE/BACKGROUND: The histological diagnosis of Mycobacterium tuberculosis (MTB) has long been a diagnostic challenge in the anatomical pathology field despite availability of different laboratory methods. Immunohistochemistry (IHC) could not only confirm granulomatous tissue involvement but also demonstrate MTB antigen immunolocalization. This study tries to clarify the details of IHC staining for MTB with pAbBCG. METHODS: A total of 50 patients undergoing simultaneous biopsy and tissue culture with positive tissue culture for MTB during 2005-2009 were selected from the MRC Department at Masih Daneshvari Hospital, Tehran, Iran...
December 2016: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28043560/the-importance-of-single-nucleotide-polymorphisms-in-interferon-gamma-receptor-1-gene-in-pulmonary-patients-infected-with-rapid-grower-mycobacterium
#20
Poopak Farnia, Jalaledin Ghanavi, Payam Tabasri, Shima Saif, Ali Akbar Velayati
OBJECTIVE/BACKGROUND: Interferon gamma (IFN-γ) plays a key role in protective immune response against Mycobacterial infection. IFN-γ excretes its antimycobacterial effectors mechanisms by activation of macrophages and dendritic cells via interaction with its receptor complex, that is, a ligand-binding subunit [IFN-γ receptor (IFNGR)1] and an accessory subunit (IFNGR2) on the cell surface. It has been shown that individuals with complete or partial IFNGR1 receptor deficiency are highly susceptible to infection by nontuberculous mycobacteria (NTM), Mycobacterium tuberculosis, and some Salmonella species...
December 2016: International Journal of Mycobacteriology
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