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Journal of Innate Immunity

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https://www.readbyqxmd.com/read/30428481/bacteria-host-crosstalk-sensing-of-the-quorum-in-the-context-of-pseudomonas-aeruginosa-infections
#1
REVIEW
Maria V Turkina, Elena Vikström
Cell-to-cell signaling via small molecules is an essential process to coordinate behavior in single species within a community, and also across kingdoms. In this review, we discuss the quorum sensing (QS) systems used by the opportunistic pathogen Pseudomonas aeruginosa to sense bacterial population density and fitness, and regulate virulence, biofilm development, metabolite acquisition, and mammalian host defense. We also focus on the role of N-acylhomoserine lactone-dependent QS signaling in the modulation of innate immune responses connected together via calcium signaling, homeostasis, mitochondrial and cytoskeletal dynamics, and governing transcriptional and proteomic responses of host cells...
November 14, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30408777/tlr-activation-alters-bone-marrow-derived-macrophage-differentiation
#2
Gertrude O Oppong-Nonterah, Omar Lakhdari, Asami Yamamura, Hal M Hoffman, Lawrence S Prince
Early exposure to inflammatory signals may have a lasting impact on immune function. Present throughout embryogenesis, macrophages are key cells providing innate immune protection to the developing fetus and newborn. Here, we have used an established model of macrophage development to test how early inflammatory signals can impact cellular differentiation and function. Bone marrow-derived macrophages were treated with Escherichia coli lipopolysaccharide (LPS) 2 days after initial isolation and culture. LPS treatment during this early stage of differentiation decreased the expression of CSF1R and increased that of the mature macrophage marker F4/80...
November 8, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30404092/extracellular-rna-sensing-by-pattern-recognition-receptors
#3
REVIEW
Megumi Tatematsu, Kenji Funami, Tsukasa Seya, Misako Matsumoto
RNA works as a genome and messenger in RNA viruses, and it sends messages in most of the creatures of the Earth, including viruses, bacteria, fungi, plants, and animals. The human innate immune system has evolved to detect single- and double-stranded RNA molecules from microbes by pattern recognition receptors and induce defense reactions against infections such as the production of type I interferons and inflammatory cytokines. To avoid cytokine toxicity causing chronic inflammation or autoimmunity by sensing self-RNA, the activation of RNA sensors is strictly regulated...
November 7, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30396172/host-peptidic-hormones-affecting-bacterial-biofilm-formation-and-virulence
#4
REVIEW
Olivier Lesouhaitier, Thomas Clamens, Thibaut Rosay, Florie Desriac, Mélissande Louis, Sophie Rodrigues, Andrei Gannesen, Vladimir K Plakunov, Emeline Bouffartigues, Ali Tahrioui, Alexis Bazire, Alain Dufour, Pierre Cornelis, Sylvie Chevalier, Marc G J Feuilloley
Bacterial biofilms constitute a critical problem in hospitals, especially in resuscitation units or for immunocompromised patients, since bacteria embedded in their own matrix are not only protected against antibiotics but also develop resistant variant strains. In the last decade, an original approach to prevent biofilm formation has consisted of studying the antibacterial potential of host communication molecules. Thus, some of these compounds have been identified for their ability to modify the biofilm formation of both Gram-negative and Gram-positive bacteria...
November 5, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30391945/trichomonas-vaginalis-induces-nlrp3-inflammasome-activation-and-pyroptotic-cell-death-in-human-macrophages
#5
Angelica Montenegro Riestra, J Andrés Valderrama, Kathryn A Patras, Sharon D Booth, Xing Yen Quek, Chih-Ming Tsai, Victor Nizet
Trichomonas vaginalis is a sexually transmitted, eukaryotic parasite that causes trichomoniasis, the most common nonviral, sexually transmitted disease in the USA and worldwide. Little is known about the molecular mechanisms involved in the host immune response to this widespread parasite. Here we report that T. vaginalis induces NLRP3 inflammasome activation in human macrophages, leading to caspase-1 activation and the processing of pro-IL-1β to the mature and bioactive form of the cytokine. Using inhibitor-based approaches, we show that NLRP3 activation by T...
November 2, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30391943/dynamics-of-structural-barriers-and-innate-immune-components-during-incubation-of-the-avian-egg-critical-interplay-between-autonomous-embryonic-development-and-maternal-anticipation
#6
REVIEW
Maxwell T Hincke, Mylène Da Silva, Nicolas Guyot, Joël Gautron, Marc D McKee, Rodrigo Guabiraba-Brito, Sophie Réhault-Godbert
The integrated innate immune features of the calcareous egg and its contents are a critical underpinning of the remarkable evolutionary success of the Aves clade. Beginning at the time of laying, the initial protective structures of the egg, i.e., the biomineralized eggshell, egg-white antimicrobial peptides, and vitelline membrane, are rapidly and dramatically altered during embryonic development. The embryo-generated extra-embryonic tissues (chorioallantoic/amniotic membranes, yolk sac, and associated chambers) are all critical to counteract degradation of primary egg defenses during development...
November 2, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30368505/aif-1-and-rnaset2-play-complementary-roles-in-the-innate-immune-response-of-medicinal-leech
#7
Nicolò Baranzini, Laura Monti, Marta Vanotti, Viviana T Orlandi, Fabrizio Bolognese, Debora Scaldaferri, Rossana Girardello, Gianluca Tettamanti, Magda de Eguileor, Jacopo Vizioli, Roberto Taramelli, Francesco Acquati, Annalisa Grimaldi
Recent studies demonstrated that allograft inflammatory factor-1 (AIF-1) and RNASET2 act as chemoattractants for macrophages and modulate the inflammatory processes in both vertebrates and invertebrates. The expression of these proteins significantly increases after bacterial infection; however, the mechanisms by which they regulate the innate immune response are still poorly defined. Here, we evaluate the effect of bacterial lipopolysaccharide injection on the expression pattern of these genes and the interrelation between them during innate immune response in the medicinal leech, an invertebrate model with a simple anatomy and a marked similarity with vertebrates in inflammatory processes...
October 26, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30359972/journal-of-innate-immunity-ten-years-later
#8
EDITORIAL
(no author information available yet)
No abstract text is available yet for this article.
October 25, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30347401/biofilm-leukocyte-cross-talk-impact-on-immune-polarization-and-immunometabolism
#9
REVIEW
Kelsey J Yamada, Tammy Kielian
Biofilms are bacterial communities contained within an extracellular matrix, which can colonize both native tissues and artificial surfaces. In particular, indwelling medical devices and prosthetic implants are targets for biofilm formation because they facilitate bacterial attachment via host proteins that coat the foreign body. Biofilm infections are particularly challenging to treat, since they are not readily cleared by antibiotics, require invasive procedures to eradicate, and are prone to recurrence. It has been demonstrated that biofilm-derived products can actively suppress proinflammatory immune responses, as evident by the recruitment of myeloid-derived suppressor cells and macrophage (MФ) polarization towards an anti-inflammatory state...
October 22, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30296787/compromised-dna-repair-and-signalling-in-human-granulocytes
#10
Viviane Ponath, Daniel Heylmann, Tobias Haak, Kevin Woods, Huong Becker, Bernd Kaina
In previous studies, we showed impaired DNA repair in human monocytes. Here, we addressed the question of whether human neutrophilic granulocytes that arise from the same precursor as monocytes exhibit a similar phenotype and are impaired in repairing their DNA. We show that neutrophilic granulocytes isolated from peripheral blood display a lack of the same repair proteins that are missing in monocytes and do not show repair of their DNA when damaged by ionising radiation (IR) or chemical ROS. Contrary to T cells, we observed no decline in the number of single-strand breaks following γ-radiation...
October 8, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30293076/surfactant-proteins-a-and-d-trimerized-innate-immunity-proteins-with-an-affinity-for-viral-fusion-proteins
#11
REVIEW
Alastair Watson, Maximillian J S Phipps, Howard W Clark, Chris-Kriton Skylaris, Jens Madsen
Innate recognition of viruses is an essential part of the immune response to viral pathogens. This is integral to the maintenance of healthy lungs, which are free from infection and efficient at gaseous exchange. An important component of innate immunity for identifying viruses is the family of C-type collagen-containing lectins, also known as collectins. These secreted, soluble proteins are pattern recognition receptors (PRRs) which recognise pathogen-associated molecular patterns (PAMPs), including viral glycoproteins...
October 5, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30286447/the-gut-microbiota-and-hematopoietic-stem-cell-transplantation-challenges-and-potentials
#12
REVIEW
Fozia Noor, Anne Kaysen, Paul Wilmes, Jochen G Schneider
The human gut microbiota gained tremendous importance in the last decade as next-generation technologies of sequencing and multiomics analyses linked the role of the microbial communities to host physiology and pathophysiology. A growing number of human pathologies and diseases are linked to the gut microbiota. One of the main mechanisms by which the microbiota influences the host is through its interactions with the host immune system. These interactions with both innate and adaptive host intestinal and extraintestinal immunity, although usually commensalistic even mutualistic with the host, in some cases lead to serious health effects...
October 4, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30269134/catch-me-if-you-can-streptococcus-pyogenes-complement-evasion-strategies
#13
REVIEW
David Ermert, Maisem Laabei
The human host has evolved elaborate protection mechanisms to prevent infection from the billions of microorganisms to which it host is exposed and is home. One of these systems, complement, is an evolutionary ancient arm of innate immunity essential for combatting bacterial infection. Complement permits the efficient labelling of bacteria with opsonins, supports phagocytosis, and facilitates phagocyte recruitment to the site of infection through the production of chemoattractants. However, it is by no means perfect, and certain organisms engage in an evolutionary arms race with the host where complement has become a major target to promote immune evasion...
September 28, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30257246/expanding-neutrophil-horizons-new-concepts-in-inflammation
#14
REVIEW
Simon M Chatfield, Nathalie Thieblemont, Véronique Witko-Sarsat
Research into neutrophil biology in the last 10 years has uncovered a number of unexpected aspects of this still mysterious innate immune cell. Advances in technology have allowed visualisation of neutrophil trafficking to sites of inflammation, and, remarkably, neutrophils have been observed to depart from the scene in what has been termed reverse migration. There has also been increasing appreciation of the heterogeneity of neutrophils with ongoing categorisation of neutrophil subsets, including myeloid-derived suppressor cells and low-density granulocytes...
September 26, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30253386/cyclic-dimeric-guanosine-monophosphate-activation-and-inhibition-of-innate-immune-response
#15
REVIEW
Tao Cui, Huaixing Cang, Baoqiang Yang, Zheng-Guo He
Cyclic dimeric guanosine monophosphate (c-di-GMP) is a universally conserved second messenger that contributes to the pathogenicity of numerous bacterial species. In recent years, growing evidence has shown that bacterial extracellular c-di-GMP can interact with the innate immune system and regulate host immune responses. This review summarizes our current understanding on the dual roles of bacterial c-di-GMP in pathogen-host interaction: activation of the antibacterial innate immune response through the cytosolic surveillance pathway and inhibition of innate immune defense for iron restriction...
September 25, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30205385/a-trypsin-sensitive-proteoglycan-from-the-tapeworm-hymenolepis-diminuta-inhibits-murine-neutrophil-chemotaxis-in-vitro-by-suppressing-p38-map-kinase-activation
#16
Nicholas Graves, Vivek P Venu, Bryan G Yipp, Björn Petri, Simon Hirota, John Gilleard, Derek M McKay, Fernando Lopes
It has emerged that neutrophils can play important roles in the host response following infection with helminth parasites. Mice infected with the tapeworm, Hymenolepis diminuta, are protected from some inflammatory conditions, accompanied by reduced neutrophil tissue infiltration. Thus, the ability of a phosphate-buffered saline-soluble extract of the worm (H. diminuta extract [HdE]) was tested for (1) its ability to activate murine neutrophils (Ca2+ mobilization, reactive oxygen species (ROS) and cytokine production); and (2) affect neutrophil chemotaxis in vitro to the penta-peptide, WKYMVm, the chemokine, KC, and leukotriene B4...
September 11, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30189430/markers-involved-in-innate-immunity-and-neutrophil-activation-are-elevated-during-acute-human-anaphylaxis-validation-of-a-microarray-study
#17
Abbie Francis, Erika Bosio, Shelley F Stone, Daniel M Fatovich, Glenn Arendts, Stephen P J MacDonald, Sally Burrows, Simon G A Brown
BACKGROUND: We have previously identified the upregulation of the innate immune response, neutrophil activation, and apoptosis during anaphylaxis using a microarray approach. This study aimed to validate the differential gene expression and investigate protein concentrations of "hub genes" and upstream regulators during anaphylaxis. METHODS: Samples were collected from patients with anaphylaxis on their arrival at the emergency department, and after 1 and 3 h...
September 6, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30176668/staphylococcus-epidermidis-activates-aryl-hydrocarbon-receptor-signaling-in-human-keratinocytes-implications-for-cutaneous-defense
#18
Franziska Rademacher, Maren Simanski, Bettina Hesse, Gregor Dombrowsky, Nikolas Vent, Regine Gläser, Jürgen Harder
Bacterial challenge of keratinocytes with the abundant skin commensal Staphylococcus epidermidis induces distinct innate immune responses, but the underlying molecular mechanisms are still emerging. We report that the aryl hydrocarbon receptor (AhR) was activated in human primary keratinocytes infected with S. epidermidis, leading to induction of the AhR-responsive gene cytochrome P450 1A1 (CYP1A1). In addition, functional AhR was required for S. epidermidis-mediated induction of IL-1β expression in keratinocytes...
September 3, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30176656/candida-platelet-interaction-and-platelet-activity-in-vitro
#19
Claudia Eberl, Cornelia Speth, Ilse D Jacobsen, Martin Hermann, Magdalena Hagleitner, Hemalata Deshmukh, Christoph G Ammann, Cornelia Lass-Flörl, Günter Rambach
Over the last 2 decades, platelets have been recognized as versatile players of innate immunity. The interaction of platelets with fungal pathogens and subsequent processes may critically influence the clinical outcome of invasive mycoses. Since the role of platelets in Candida infections is poorly characterized and controversially discussed, we studied interactions of human platelets with yeast cells, (pseudo-)hyphae, biofilms and secretory products of human pathogenic Candida species applying platelet rich plasma and a whole blood model...
September 3, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/30165356/chemokine-subversion-by-human-herpesviruses
#20
REVIEW
Sergio M Pontejo, Philip M Murphy, James E Pease
Viruses use diverse molecular mechanisms to exploit and evade the immune response. Herpesviruses, in particular, encode functional chemokine and chemokine receptor homologs pirated from the host, as well as secreted chemokine-binding proteins with unique structures. Multiple functions have been described for herpesvirus chemokine components, including attraction of target cells, blockade of leukocyte migration, and modulation of gene expression and cell entry by the virus. Here we review current concepts about how human herpesvirus chemokines, chemokine receptors, and chemokine-binding proteins may be used to shape a proviral state in the host...
August 30, 2018: Journal of Innate Immunity
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