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Bacterial adaptive immunity

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https://www.readbyqxmd.com/read/29219058/macrophage-targeted-cellular-carriers-for-effective-delivery-of-anti-tubercular-drugs
#1
S Beg, Jaya Agnihotri, Shibhna Singh, Mohammad Wais
Newly developed vaccine VPM1002 confers paradigm swing in the prophylactic treatment of tuberculosis (TB).Multi drug resistant and latent TB in adults as well as in underprivileged patients is instigating menace over world population if the host is immune-compromised. One third of the world's population is infected with TB. Recently it is estimated around 9.6 million people around the world became sick with TB disease. There were 1.5 million TB-related deaths worldwide. Therefore with the advent in biotechnology and Nano engineering, newly adapted survival molecular mechanism of Mycobacterium tuberculosis, new targets receptors on alveolar macrophages must be explored out for eradication of TB from the globe...
December 7, 2017: Recent Patents on Anti-infective Drug Discovery
https://www.readbyqxmd.com/read/29209320/how-mucosal-epithelia-deal-with-stress-role-of-nkg2d-nkg2d-ligands-during-inflammation
#2
REVIEW
Fabrizio Antonangeli, Alessandra Soriani, Cristina Cerboni, Giuseppe Sciumè, Angela Santoni
Mucosal epithelia encounter both physicochemical and biological stress during their life and have evolved several mechanisms to deal with them, including regulation of immune cell functions. Stressed and damaged cells need to be cleared to control local inflammation and trigger tissue healing. Engagement of the activating NKG2D receptor is one of the most direct mechanisms involved in the recognition of stressed cells by the immune system. Indeed, injured cells promptly express NKG2D ligands that in turn mediate the activation of lymphocytes of both innate and adaptive arms of the immune system...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29204145/molecular-signatures-of-immunity-and-immunogenicity-in-infection-and-vaccination
#3
REVIEW
Mariëlle C Haks, Barbara Bottazzi, Valentina Cecchinato, Corinne De Gregorio, Giuseppe Del Giudice, Stefan H E Kaufmann, Antonio Lanzavecchia, David J M Lewis, Jeroen Maertzdorf, Alberto Mantovani, Federica Sallusto, Marina Sironi, Mariagrazia Uguccioni, Tom H M Ottenhoff
Vaccinology aims to understand what factors drive vaccine-induced immunity and protection. For many vaccines, however, the mechanisms underlying immunity and protection remain incompletely characterized at best, and except for neutralizing antibodies induced by viral vaccines, few correlates of protection exist. Recent omics and systems biology big data platforms have yielded valuable insights in these areas, particularly for viral vaccines, but in the case of more complex vaccines against bacterial infectious diseases, understanding is fragmented and limited...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29197958/immunohaemostasis-a-new-view-on-haemostasis-during-sepsis
#4
REVIEW
Xavier Delabranche, Julie Helms, Ferhat Meziani
Host infection by a micro-organism triggers systemic inflammation, innate immunity and complement pathways, but also haemostasis activation. The role of thrombin and fibrin generation in host defence is now recognised, and thrombin has become a partner for survival, while it was seen only as one of the "principal suspects" of multiple organ failure and death during septic shock. This review is first focused on pathophysiology. The role of contact activation system, polyphosphates and neutrophil extracellular traps has emerged, offering new potential therapeutic targets...
December 2, 2017: Annals of Intensive Care
https://www.readbyqxmd.com/read/29191848/keratin-6a-reorganization-for-ubiquitin-proteasomal-processing-is-a-direct-antimicrobial-response
#5
Jonathan K L Chan, Don Yuen, Priscilla Hiu-Mei Too, Yan Sun, Belinda Willard, David Man, Connie Tam
Skin and mucosal epithelia deploy antimicrobial peptides (AMPs) to eliminate harmful microbes. We reported that the intermediate filament keratin 6a (K6a) is constitutively processed into antimicrobial fragments in corneal epithelial cells. In this study, we show that K6a network remodeling is a host defense response that directly up-regulates production of keratin-derived AMPs (KAMPs) by the ubiquitin-proteasome system (UPS). Bacterial ligands trigger K6a phosphorylation at S19, S22, S37, and S60, leading to network disassembly...
November 30, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/29190678/type-i-interferon-signaling-restrains-il-10r-colonic-macrophages-and-dendritic-cells-and-leads-to-more-severe-salmonella-colitis
#6
Kailyn L Stefan, Avner Fink, Neeraj K Surana, Dennis L Kasper, Suryasarathi Dasgupta
Type I interferons (IFNα, IFNβ) are key regulators of innate and adaptive immunity, modulating the severity of both viral and bacterial infections. While type I IFN signaling leads to improved outcomes in viral infections, its role in bacterial infections is more contextual and depends on the specific pathogen and route of infection. Given the limited evidence on whether type I IFN signaling affects enteric bacterial pathogens, we investigated the role of this signaling pathway in Salmonella enterica serovar Typhimurium (S...
2017: PloS One
https://www.readbyqxmd.com/read/29179671/phylogenomics-of-cas4-family-nucleases
#7
Sanjarbek Hudaiberdiev, Sergey Shmakov, Yuri I Wolf, Michael P Terns, Kira S Makarova, Eugene V Koonin
BACKGROUND: The Cas4 family endonuclease is a component of the adaptation module in many variants of CRISPR-Cas adaptive immunity systems. Unlike most of the other Cas proteins, Cas4 is often encoded outside CRISPR-cas loci (solo-Cas4) and is also found in mobile genetic elements (MGE-Cas4). RESULTS: As part of our ongoing investigation of CRISPR-Cas evolution, we explored the phylogenomics of the Cas4 family. About 90% of the archaeal genomes encode Cas4 compared to only about 20% of the bacterial genomes...
November 28, 2017: BMC Evolutionary Biology
https://www.readbyqxmd.com/read/29177864/detecting-release-of-bacterial-dsdna-into-the-host-cytosol-using-fluorescence-microscopy
#8
Roland Felix Dreier, José Carlos Santos, Petr Broz
Recognition of pathogens by the innate immune system relies on germline-encoded pattern recognition receptors (PRRs) that recognize unique microbial molecules, so-called pathogen-associated molecular patterns (PAMPs). Nucleic acids and their derivatives are one of the most important groups of PAMPs, and are recognized by a number of surface-associated as well as cytosolic PRRs. Cyclic GMP-AMP synthase (cGAS) recognizes the presence of pathogen- or host-derived dsDNA in the cytosol and initiates type-I-IFN production...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29177862/measuring-innate-immune-responses-to-bacterial-viability
#9
Julien Moretti, Nicolas Vabret, J Magarian Blander
The innate immune system directly senses microbial viability via the detection of a special class of viability-associated pathogen-associated molecular patterns (vita-PAMPs), such as prokaryotic messenger RNA. In the case of Gram-negative bacteria, detection of bacterial viability by phagocytes leads to a unique activation of inflammasome and type I interferon pathways, resulting in a robust pro-inflammatory innate response and a vigorous adaptive immune response. This protocol describes the methods required to study activation of both inflammasome and type I interferon pathways after stimulation of mouse bone marrow-derived macrophages with live or killed Gram-negative and Gram-positive bacteria...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29174635/the-independent-loss-model-with-ordered-insertions-for-the-evolution-of-crispr-spacers
#10
F Baumdicker, A M I Huebner, P Pfaffelhuber
Today, the CRISPR (clustered regularly interspaced short palindromic repeats) region within bacterial and archaeal genomes is known to encode an adaptive immune system. We rely on previous results on the evolution of the CRISPR arrays, which led to the ordered independent loss model, introduced by Kupczok and Bollback (2013). When focusing on the spacers (between the repeats), new elements enter a CRISPR array at rate θ at the leader end of the array, while all spacers present are lost at rate ρ along the phylogeny relating the sample...
November 22, 2017: Theoretical Population Biology
https://www.readbyqxmd.com/read/29170665/canonical-stimulation-of-the-nlrp3-inflammasome-by-fungal-antigens-links-innate-and-adaptive-b-lymphocyte-responses-by-modulating-il-1%C3%AE-and-igm-production
#11
Mohamed F Ali, Harika Dasari, Virginia P Van Keulen, Eva M Carmona
The NLRP3 inflammasome is activated in response to different bacterial, viral, and fungal pathogens and serves as modulator of different pattern recognition receptors signaling pathways. One of the main functions of NLRP3 is to participate in IL-1β maturation which is important in the host defense against Pneumocystis and other fungal infections. However, dysregulation of NLRP3 and IL-1β secretion are also implicated in the pathophysiology of many auto-inflammatory disorders. Often time's inflammatory flares are preceded by infectious illnesses questioning the role of infection in autoimmune exacerbations...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29169146/how-bacteria-control-the-crispr-cas-arsenal
#12
REVIEW
Lina M Leon, Senén D Mendoza, Joseph Bondy-Denomy
CRISPR-Cas systems are adaptive immune systems that protect their hosts from predation by bacteriophages (phages) and parasitism by other mobile genetic elements (MGEs). Given the potent nuclease activity of CRISPR effectors, these enzymes must be carefully regulated to minimize toxicity and maximize anti-phage immunity. While attention has been given to the transcriptional regulation of these systems (reviewed in [1]), less consideration has been given to the crucial post-translational processes that govern enzyme activation and inactivation...
November 20, 2017: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/29163354/diabetes-and-sepsis-risk-recurrence-and-ruination
#13
REVIEW
Lynn M Frydrych, Fatemeh Fattahi, Katherine He, Peter A Ward, Matthew J Delano
Sepsis develops when an infection surpasses local tissue containment. A series of dysregulated physiological responses are generated, leading to organ dysfunction and a 10% mortality risk. When patients with sepsis demonstrate elevated serum lactates and require vasopressor therapy to maintain adequate blood pressure in the absence of hypovolemia, they are in septic shock with an in-hospital mortality rate >40%. With improvements in intensive care treatment strategies, overall sepsis mortality has diminished to ~20% at 30 days; however, mortality continues to steadily climb after recovery from the acute event...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/29149896/liposomal-vaccine-formulations-as-prophylactic-agents-design-considerations-for-modern-vaccines
#14
REVIEW
Luis O De Serrano, David J Burkhart
Vaccinology is one of the most important cornerstones in modern medicine, providing better quality of life. The human immune system is composed of innate and adaptive immune processes that interplay when infection occurs. Innate immunity relies on pathogen-associated molecular patterns which are recognized by pathogen recognition receptors localized in antigen presenting cells. After antigen processing and presentation, CD4(+) T cell polarization occurs, further leading to B cell and CD8(+) activation and humoral and cell-mediated adaptive immune responses...
November 17, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/29146448/sialic-acid-binding-lectins-sabls-from-solen-grandis-function-as-prrs-ensuring-immune-recognition-and-bacterial-clearance
#15
Xiumei Wei, Dinglong Yang, Huiying Li, Hailin Jiang, Xiangquan Liu, Qin Zhang, Jialong Yang
Sialic acid-binding lectins (SABLs) are ubiquitous ancient molecules with binding properties to N-acetyl or N-glycolyl carbohydrates, and play crucial roles in both adaptive and innate immune responses. In present study, recombinant protein and antibodies of two SABLs from mollusk Solen grandis (SgSABL-1 and SgSABL-2) were prepared to investigate their functions in innate immunity. The recombinant protein of SgSABL-1 (rSgSABL-1) could bind LPS, PGN and β-glucan in vitro, while rSgSABL-2 could only bind PGN rather than LPS and β-glucan...
November 14, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29129586/mannose-binding-lectin-and-its-roles-in-immune-responses-in-grass-carp-ctenopharyngodon-idella-against-aeromonas-hydrophila
#16
Yunfei Dang, Xinzhan Meng, Shentong Wang, Lisen Li, Meng Zhang, Moyan Hu, Xiaoyan Xu, Yubang Shen, Liqun Lv, Rongquan Wang, Jiale Li
The complement system is a crucial component of the innate immune system that links innate and adaptive immunity via four pathways. Mannose-binding lectin (MBL), the initiating molecule of the lectin pathway, plays a significant role in the innate immune system in mammals and fish. Herein, we identified an MBL homolog (gcMBL) in grass carp (Ctenopharyngodon idella). The full-length 948 bp gcMBL cDNA includes a 741 bp open reading frame encoding a 246 amino acid protein with a signal peptide, collagen triple helix repeat domain, and a C-type lectin-like/link domain...
November 10, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29111601/active-migration-is-associated-with-specific-and-consistent-changes-to-gut-microbiota-in-calidris-shorebirds
#17
Alice Risely, David Waite, Beata Ujvari, Bethany Hoye, Marcel Klaassen
1.Gut microbes are increasingly recognised for their role in regulating an animal's metabolism and immunity. However, identifying repeatable associations between host physiological processes and their gut microbiota has proved challenging, in part because microbial communities often respond stochastically to host physiological stress (e.g. fasting, forced exercise or infection). 2.Migratory birds provide a valuable system in which to test host-microbe interactions under physiological extremes because these hosts are adapted to predictable metabolic and immunological challenges as they undergo seasonal migrations, including temporary gut atrophy during long-distance flights...
November 7, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/29109552/butyrate-and-propionate-inhibit-antigen-specific-cd8-t-cell-activation-by-suppressing-il-12-production-by-antigen-presenting-cells
#18
Claudia Nastasi, Simon Fredholm, Andreas Willerslev-Olsen, Morten Hansen, Charlotte Menné Bonefeld, Carsten Geisler, Mads Hald Andersen, Niels Ødum, Anders Woetmann
Short chain fatty acids (SCFAs), such as acetate, butyrate and propionate, are products of microbial macronutrients fermentation that distribute systemically and are believed to modulate host immune responses. Recent data have indicated that certain SCFAs, such as butyrate and propionate, directly modulate human dendritic cell (DC) function. Given the role of DCs in initiating and shaping the adaptive immune response, we now explore how SCFAs affect the activation of antigen-specific CD8(+) T cells stimulated with autologous, MART1 peptide-pulsed DC...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29109290/sea-anemone-model-has-a-single-toll-like-receptor-that-can-function-in-pathogen-detection-nf-%C3%AE%C2%BAb-signal-transduction-and-development
#19
Joseph J Brennan, Jonathan L Messerschmidt, Leah M Williams, Bryan J Matthews, Marinaliz Reynoso, Thomas D Gilmore
In organisms from insects to vertebrates, Toll-like receptors (TLRs) are primary pathogen detectors that activate downstream pathways, specifically those that direct expression of innate immune effector genes. TLRs also have roles in development in many species. The sea anemone Nematostella vectensis is a useful cnidarian model to study the origins of TLR signaling because its genome encodes a single TLR and homologs of many downstream signaling components, including the NF-κB pathway. We have characterized the single N...
November 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29093656/functional-defects-in-type-3-innate-lymphoid-cells-and-classical-monocytes-in-a-patient-with-hyper-ige-syndrome
#20
Yuna Chang, Sung-Yoon Kang, Jihyun Kim, Hye-Ryun Kang, Hye Young Kim
Hyper-IgE syndrome (HIES) is a very rare primary immune deficiency characterized by elevated serum IgE levels, recurrent bacterial infections, chronic dermatitis, and connective tissue abnormalities. Autosomal dominant (AD) HIES involves a mutation in signal transducer and activator of transcription 3 (STAT3) that leads to an impaired TH17 response. STAT3 signaling is also involved in the function of RORγt(+) type 3 innate lymphoid cells (ILC3s) and RORγt(+)TH17 cells. The aim of this study was to investigate the role of innate immune cells such as innate lymphoid cells (ILCs), granulocytes, and monocytes in a patient with HIES...
October 2017: Immune Network
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