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Infection and Immunity

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https://www.readbyqxmd.com/read/28717032/th17-mediated-cross-protection-against-pneumococcal-carriage-by-vaccination-with-a-variable-antigen
#1
Kirsten Kuipers, Wouter S P Jong, Christa E van der Gaast-de Jongh, Diane Houben, Fred van Opzeeland, Elles Simonetti, Saskia van Selm, Ronald de Groot, Marije I Koenders, Taj Azarian, Elder Pupo, Peter van der Ley, Jeroen D Langereis, Aldert Zomer, Joen Luirink, Marien I de Jonge
Serotype-specific protection against a Streptococcus pneumoniae is an important limitation of the current polysaccharide-based vaccines. To prevent serotype replacement, reduce transmission and limit emergence of new variants, it is essential to induce broad protection and restrict pneumococcal colonization. In this study, we used a prototype vaccine formulation consisting of LPS-detoxified outer membrane vesicles (OMVs) from Salmonella Typhimurium displaying the variable N-terminus of PspA (α1α2) for intranasal vaccination, which induced strong Th17 immunity associated with substantial reduction of pneumococcal colonization...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28717031/phagocytic-receptors-activate-syk-and-src-signaling-during-borrelia-burgdorferi-phagocytosis
#2
Tess L Killpack, Maria Ballesteros, Stephen C Bunnell, Alice Bedugnis, Lester Kobzik, Linden T Hu, Tanja Petnicki-Ocwieja
Phagocytosis of the Lyme disease causing pathogen Borrelia burgdorferi has been shown to be important in generating an inflammatory response to the pathogen. As a result, understanding the mechanisms of phagocytosis has been an area of great interest in the field of Lyme disease. Several cell surface receptors that participate in B. burgdorferi phagocytosis have been reported, including scavenger receptor MARCO and integrin α3β1. We sought to define the mechanisms by which these receptors mediated phagocytosis and to identify signaling pathways activated downstream of these receptors upon contact with B...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28717030/intestinal-epithelial-ecto-5-nucleotidase-cd73-regulates-intestinal-colonization-and-infection-by-nontyphoidal-salmonella
#3
Daniel J Kao, Bejan J Saeedi, David Kitzenberg, Krista M Burney, Evgenia Dobrinskikh, Kayla D Battista, Andrés Vázquez-Torres, Sean P Colgan, Douglas J Kominsky
Ecto-5' -nucleotidase (CD73) is expressed abundantly on the apical surface of intestinal epithelial cells (IEC) and functions as the terminal enzyme in the generation of extracellular adenosine. Previous work has demonstrated that adenosine signaling in IECs results in a number of tissue-protective effects during inflammation; however, a rationale for its apical expression has been lacking. We hypothesized that the highly polarized expression of CD73 is indicative of an important role for extracellular adenosine as a mediator of host-microbe interactions...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28717029/the-metabolite-transporter-peg344-is-required-for-the-full-virulence-of-the-hypervirulent-klebsiella-pneumoniae-strain-hvkp1-after-pulmonary-but-not-subcutaneous-challenge
#4
Jeffrey Bulger, Ulrike MacDonald, Ruth Olson, Janet Beanan, Thomas A Russo
Hypervirulent Klebsiella pneumoniae (hvKP) is an emerging pathotype that is capable of causing tissue-invasive, organ and life threatening infections in healthy individuals from the community. Knowledge on the virulence factors specific to hvKP is limited. In this report we describe a new factor (PEG344) that increases the virulence of the hvKP strain hvKP1. peg344 is present on the hvKP1 virulence plasmid, is broadly prevalent among hvKP strains, and has increased RNA abundance when grown in human ascites...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28717028/the-norepinephrine-metabolite-3-4-dihydroxymandelic-acid-is-produced-by-the-commensal-microbiota-and-promotes-chemotaxis-and-virulence-gene-expression-in-enterohemorrhagic-escherichia-coli
#5
Nitesh Sule, Sasi Pasupuleti, Nandita Kohli, Rani Menon, Lawrence J Dangott, Michael D Manson, Arul Jayaraman
Enterohemorrhagic E. coli (EHEC) is a commonly occuring foodborne pathogen responsible for numerous multistate outbreaks in the US. It is known to infect the host gastrointestinal tract, specifically in locations associated with lymphoid tissue. These niches serve as sources of enteric neurotransmitters such as epinephrine and norepinephrine that are known to increase virulence in several pathogens, including enterohemorrhagic E. coli The mechanisms that allow pathogens to target these niches are poorly understood...
July 17, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28694295/in-vivo-analysis-of-the-viable-microbiota-and-helicobacter-pylori-transcriptome-in-gastric-infection-and-early-stages-of-carcinogenesis
#6
Kaisa Thorell, Johan Bengtsson-Palme, Oscar Hsin-Fu Liu, Reyna Victoria Palacios Gonzales, Intawat Nookaew, Linda Rabeneck, Lawrence Paszat, David Y Graham, Jens Nielsen, Samuel B Lundin, Åsa Sjöling
Emerging evidence shows that the human microbiota plays a larger role in disease progression and health than previously anticipated. Helicobacter pylori, the causative agent of gastric cancer and duodenal and gastric ulcers, was early associated with gastric disease, but it has also been proposed that the accompanying microbiota in Helicobacter pylori-infected individuals might affect disease progression and gastric cancer development. In this study, the composition of the transcriptionally active microbial community and the H...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28694294/bacteroides-fragilis-enterotoxin-induces-the-formation-of-autophagosomes-in-endothelial-cells-but-interferes-their-autophagosomal-fusion-with-lysosomes-for-complete-autophagic-flux-through-a-mitogen-activated-protein-kinase-ap-1-and-c-ebp-homologous-protein
#7
Su Hyuk Ko, Jong Ik Jeon, Hyun Soo Myung, Young-Jeon Kim, Jung Mogg Kim
Bacteroides fragilis enterotoxin (BFT), a virulence factor of enterotoxigenic B. fragilis (ETBF), plays an essential role in mucosal inflammation. Although autophagy contributes to the pathogenesis of diverse infectious diseases, little is known about autophagy in ETBF infection. This study was conducted to investigate the role of BFT in the autophagic process in endothelial cells (ECs). Stimulation of human umbilical vein ECs (HUVECs) with BFT increased LC3-II conversion from LC3-I and protein expression of p62, Atg5 and Atg12...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28694293/the-trophic-life-cycle-stage-of-the-opportunistic-fungal-pathogen-pneumocystis-murina-hinders-the-ability-of-dendritic-cells-to-stimulate-cd4-t-cell-responses
#8
Heather M Evans, Andrew Simpson, Shu Shen, Arnold J Stromberg, Carol L Pickett, Beth A Garvy
The life cycle of the opportunistic fungal pathogen Pneumocystis murina consists of a trophic stage and an ascus-like cystic stage. Infection with the cyst stage induces proinflammatory immune responses, while trophic forms suppress the cytokine response to multiple PAMPs, including β-glucan. A targeted gene expression assay was used to evaluate the dendritic cell response following stimulation with trophic forms alone, a normal mixture of trophic forms and cysts, or with β-glucan. We demonstrate that stimulation with trophic forms downregulated the expression of multiple genes normally associated with the response to infection, including genes encoding transcription factors...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28694292/specialized-pro-resolving-mediators-spm-rescue-infant-mice-from-lethal-citrobacter-rodentium-infection-and-promote-immunity-against-re-infection
#9
Luis Alonso Diaz, Norman H Altman, Wasif Khan, Charles N Serhan, Becky Adkins
Infants are generally highly susceptible to oral pathogens. Intestinal infection and the associated diarrhea are significant global causes of morbidity and mortality in infants. Among the enteric pathogens, enteropathogenic E. coli (EPEC) stands out as showing the highest risk for infection-induced death in infants ≤ 12 months old. We have developed an experimental model of infant infection with EPEC, using the murine specific pathogen Citrobacter rodentium Our murine infant model is similar to EPEC infection in human infants since infant mice are much more susceptible to C...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28694291/differential-regulation-of-mas-related-g-protein-coupled-receptor-x2-mediated-mast-cell-degranulation-by-antimicrobial-host-defense-peptides-and-p-gingivalis-lps
#10
Kshitij Gupta, Chizobam Idahosa, Saptarshi Roy, Donguk Lee, Hariharan Subramanian, Anuradha Dhingra, Kathleen Boesze-Battaglia, Jonathan Korostoff, Hydar Ali
Porphyromonas gingivalis (P. gingivalis) is a keystone pathogen that contributes to periodontal pathogenesis by disrupting host-microbe homeostasis and promoting dysbiosis. Virulence of P. gingivalis likely reflects an alteration in the lipid A composition of its lipopolysaccharide (LPS) from the penta-acylated (PgLPS1690) to the tetra-acylated (PgLPS1435/1449) form. Mast cells play an important role in periodontitis but the mechanisms of their activation and regulation remain unknown. The expression of epithelium and neutrophil-derived host defense peptides (HDPs; LL-37, human β-defensin-3), which activate mast cells via Mas-related G protein coupled receptor X2 (MRGPRX2), is increased in periodontitis...
July 10, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674034/antibody-mediated-catalysis-in-infection-and-immunity
#11
Anthony Bowen, Maggie Wear, Arturo Casadevall
The existence of catalytic antibodies has been known for decades. Natural antibodies capable of cleaving nucleic acid, protein, and polysaccharide substrates have been described. Although the discovery of catalytic antibodies initially aroused great interest because of their promise for the development of new catalysts, their enzymatic performance has been disappointing due to slow reaction rates. However, in the areas of infection and immunity, where processes often occur over much longer time frames and involve high antibody concentrations, even slow catalytic rates have the potential to influence biological outcomes...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674033/haemophilus-parainfluenzae-strain-atcc33392-forms-biofilms-in-vitro-and-during-experimental-otitis-media-infections
#12
Bing Pang, W Edward Swords
Haemophilus parainfluenzae is a nutritionally fastidious, Gram-negative bacterium with an oropharyngeal/nasopharyngeal carriage niche that is associated with a range of opportunistic infections, which include infectious endocarditis and otitis media (OM). These infections are often chronic/recurrent in nature and typically involve bacterial persistence within biofilm communities that are highly resistant to host clearance. This study addresses the primary hypothesis that H. parainfluenzae forms biofilm communities that are important determinants of persistence in vivo The results from in vitro biofilm studies confirmed that H...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674032/genetic-adjuvantation-of-a-cell-based-therapeutic-vaccine-for-amelioration-of-chagasic-cardiomyopathy
#13
Vanaja Konduri, Matthew M Halpert, Dan Liang, Jonathan M Levitt, Julio V C Cruz, Bin Zhan, Maria Elena Bottazzi, Peter J Hotez, Kathryn M Jones, William K Decker
Chagas disease, caused by infection with the protozoan parasite Trypanosoma cruzi, is a leading cause of heart disease ("Chagasic cardiomyopathy") in Latin America, disproportionately affecting people in resource poor areas. Efficacy of currently approved pharmaceutical treatments is mainly limited to acute infection, and there are no effective treatments for the chronic phase of the disease. Pre-clinical models of Chagas disease have demonstrated that antigen specific CD8(+)IFNγ(+) T-cell responses are essential for reducing parasite burdens, increasing survival, and decreasing cardiac pathology in both the acute and chronic phases of Chagas disease...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674031/the-role-of-sapa-and-yfga-in-susceptibility-to-antibody-mediated-complement-dependent-killing-and-virulence-of-salmonella-enterica-typhimurium
#14
Edna M Ondari, Jennifer N Heath, Elizabeth J Klemm, Gemma Langridge, Lars Barquist, David A Goulding, Simon Clare, Gordon Dougan, Robert A Kingsley, Calman A MacLennan
The ST313 pathovar of S Typhimurium contributes to a high burden of invasive disease among African infants and HIV-infected adults. It is characterized by genome degradation (loss of coding capacity) and has increased resistance to antibody-dependent complement-mediated killing compared with enterocolitis-causing strains of S Typhimurium. Vaccination is an attractive disease-prevention strategy and leading candidates focus on the induction of bactericidal antibodies. Antibody-resistant strains arising through further gene deletion could compromise such a strategy...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674030/s-nitrosoglutathione-reductase-gsnor-deficiency-confers-improved-survival-and-neurological-outcome-in-experimental-cerebral-malaria
#15
Robyn E Elphinstone, Rickvinder Besla, Eric A Shikatani, Ziyue Lu, Alfred Hausladen, Matthew Davies, Clinton S Robbins, Mansoor Husain, Jonathan S Stamler, Kevin C Kain
Artesunate remains the mainstay of treatment for cerebral malaria, but is less effective in later stages of disease when the host inflammatory response and blood brain barrier integrity dictate clinical outcomes. Nitric oxide (NO) is an important regulator of inflammation and microvascular integrity, and impaired NO bioactivity is associated with fatal outcomes in malaria. Endogenous NO bioactivity in mammals is largely mediated by S-nitrosothiols (SNOs). Based on these observations, we hypothesized that animals deficient in the SNO-metabolizing enzyme, S-nitrosoglutathione (GSNO) reductase (GSNOR), which exhibit enhanced S-nitrosylation, would have improved outcomes in a preclinical model of cerebral malaria...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28674029/atla-mediates-extracellular-dna-release-that-contributes-to-streptococcus-mutans-biofilm-formation-in-an-experimental-infective-endocarditis-rat-model
#16
Chiau-Jing Jung, Ron-Bin Hsu, Chia-Tung Shun, Chih-Chieh Hsu, Jean-San Chia
Host factors, like platelets, have been shown to enhance biofilm formation of oral commensal streptococci, inducing infective endocarditis (IE), but how bacterial components contribute to biofilm formation in vivo is still not clear. We previously demonstrated that an isogenic mutant strain of Streptococcus mutans deficient in autolysin AtlA (ΔatlA) showed reduced ability to cause vegetation in a rat model of bacterial endocarditis. However, the role of AtlA in bacterial biofilm formation is unclear. Herein, confocal laser scanning microscopy analysis showed the extracellular DNA (eDNA) embedded inside S...
July 3, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28652313/identification-and-characterization-of-klebsiella-pneumoniae-two-lpxl-lipid-a-late-acyltransferases-and-their-role-in-virulence
#17
Grant Mills, Amy Dumigan, Timothy Kidd, Laura Hobley, José A Bengoechea
Klebsiella pneumoniae causes a wide range of infections, from urinary tract infections to pneumonia. The lipopolysaccharide is a virulence factor of this pathogen, although there are gaps in our understanding of its biosynthesis. Here we report the characterization of K. pneumoniae LpxL which encodes one of the enzymes responsible for late secondary acylation of immature lipid A molecules. Analysis of the available K. pneumoniae genomes revealed that this pathogen encodes two orthologues of Escherichia coli LpxL...
June 26, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28652312/nanr-regulates-nani-sialidase-expression-by-clostridium-perfringens-f4969-a-human-enteropathogenic-strain
#18
Jihong Li, Daniel R Evans, John C Freedman, Bruce A McClane
Clostridium perfringens can produce up to three different sialidases including NanI, its major exosialidase. The current study first showed that human intestinal strains of C. perfringens can utilize for growth either glucose or sialic acids, such as N-acetylneuraminic acid (Neu5Ac), which are the end products of sialidase activity. For the human enteropathogenic strain F4969, it was then determined that culture supernatant sialidase activity and expression of exosialidase genes, particularly nanI, are influenced by the presence of Neu5Ac or glucose...
June 26, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28652311/a-nutrient-regulated-cyclic-diguanylate-phosphodiesterase-controls-clostridium-difficile-biofilm-and-toxin-production-during-stationary-phase
#19
Erin B Purcell, Robert W McKee, David S Courson, Elizabeth M Garrett, Shonna M McBride, Richard E Cheney, Rita Tamayo
The signaling molecule cyclic diguanylate (c-di-GMP) mediates physiological adaptation to extracellular stimuli in a wide range of bacteria. The complex metabolic pathways governing c-di-GMP synthesis and degradation are highly regulated, but the specific cues that impact c-di-GMP signaling are largely unknown. In the intestinal pathogen Clostridium difficile, c-di-GMP inhibits flagellar motility and toxin production, and promotes pilus-dependent biofilm formation, but no specific biological functions have been ascribed to any of the individual c-di-GMP synthases or phosphodiesterases...
June 26, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28652310/bacterial-nucleotidyl-cyclase-inhibits-host-innate-immune-response-through-suppressing-tak1-activation
#20
Chenxi He, Yilong Zhou, Feng Liu, Haipeng Liu, Hao Tan, Shouguang Jin, Weihui Wu, Baoxue Ge
Exoenzyme Y (ExoY) is a type III secretion system effector found in 90% of the Pseudomonas aeruginosa isolates. Although it is known that ExoY is a soluble nucleotidyl cyclase that increases the cytoplasmic levels of nucleoside 3' , 5' -cyclic monophosphates (cNMPs) to mediate endothelial Tau phosphorylation and permeability, its functional role in the innate immune response is still poorly understood. Transforming growth factor β activated kinase-1 (TAK1) is critical for mediating Toll-like receptor (TLR) signaling and subsequent activation of NF-κB and AP-1, which are transcriptional activators of innate immunity...
June 26, 2017: Infection and Immunity
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