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Bacterial pathogenesis

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https://www.readbyqxmd.com/read/29679773/distinctive-infectious-complications-in-patients-with-central-nervous-system-lymphoma-undergoing-thiotepa-busulfan-and-cyclophosphamide-tbc-conditioned-autologous-stem-cell-transplantation
#1
Michael Scordo, Sejal M Morjaria, Eric R Littmann, Ankush Bhatia, Helen H Chung, Molly Maloy, Lisa M DeAngelis, Sergio A Giralt, Ying Taur, Craig S Sauter
We investigated the incidence of viral, fungal, bacterial, and parasitic infections observed in 57 patients with central nervous system lymphoma (CNSL) after TBC-ASCT and 79 patients with systemic NHL after traditional BEAM-ASCT. Twenty of 57 (35%) TBC-ASCT patients had detectable viremia with human herpesvirus 6 (HHV-6), cytomegalovirus (CMV), adenovirus (ADV), or BK virus (BKV), versus 9 of 79 (11%) BEAM-ASCT patients. Nine TBC-ASCT patients had clinically relevant viral infections (4 HHV-6, 2 CMV, 1 ADV, 2 BKV), versus 0 in the BEAM-ASCT group...
April 18, 2018: Biology of Blood and Marrow Transplantation
https://www.readbyqxmd.com/read/29679484/the-role-of-autoimmune-reactivity-induced-by-heat-shock-protein-70-in-the-pathogenesis-of-essential-hypertension
#2
REVIEW
Bernardo Rodriguez-Iturbe, Miguel A Lanaspa, Richard J Johnson
Autoimmunity is increasingly recognized as having a central role in essential hypertension. Heat shock proteins are immunodominant molecules with high interspecies homology and autoimmune reactivity directed against HSP70 may play a role in the pathogenesis of hypertension. Autoimmunity to HSP70 may result from molecular mimicry between human HSP and bacterial HSP, or alternatively, as a response to HSP70-peptide complexes generated during cellular stress and delivered to the major histocompatibility complex in antigen presenting cells...
April 21, 2018: British Journal of Pharmacology
https://www.readbyqxmd.com/read/29678129/clustage-a-tool-for-clustering-and-distribution-analysis-of-bacterial-accessory-genomic-elements
#3
Egon A Ozer
BACKGROUND: The non-conserved accessory genome of bacteria can be associated with important adaptive characteristics that can contribute to niche specificity or pathogenicity of strains. High degrees of structural and compositional diversity in genomic islands and other elements of the accessory genome can complicate characterization of accessory genome contents among populations of strains. Methods for easily and effectively defining the distributions of discrete elements of the accessory genome among bacterial strains in a population are needed to explore the relationships between the flexible genome and bacterial adaptive traits...
April 20, 2018: BMC Bioinformatics
https://www.readbyqxmd.com/read/29674747/glycointeractions-in-bacterial-pathogenesis
#4
REVIEW
Jessica Poole, Christopher J Day, Mark von Itzstein, James C Paton, Michael P Jennings
Many important interactions between bacterial pathogens and their hosts are highly specific binding events that involve host or pathogen carbohydrate structures (glycans). Glycan interactions can mediate adhesion, invasion and immune evasion and can act as receptors for toxins. Several bacterial pathogens can also enzymatically alter host glycans to reveal binding targets, degrade the host cell glycans or alter the function of host glycoproteins. In recent years, high-throughput screening technologies, such as lectin, glycan and mucin microarrays, have transformed the field by identifying new bacterial-host glycointeractions, which are crucial for colonization, persistence and disease...
April 19, 2018: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/29673332/expression-of-cytokines-in-aqueous-humor-from-fungal-keratitis-patients
#5
Yingnan Zhang, Qingfeng Liang, Yang Liu, Zhiqiang Pan, Christophe Baudouin, Antoine Labbé, Qingxian Lu
BACKGROUND: Although a series of reports on corneal fungal infection have been published, studies on pathogenic mechanisms and inflammation-associated cytokines remain limited. In this study, aqueous humor samples from fungal keratitis patients were collected to examine cytokine patterns and cellular profile for the pathogenesis of fungal keratitis. METHODS: The aqueous humor samples were collected from ten patients with advanced stage fungal keratitis. Eight aqueous humor samples from patients with keratoconus or corneal dystrophy were taken as control...
April 19, 2018: BMC Ophthalmology
https://www.readbyqxmd.com/read/29669991/ribosome-inactivating-proteins-from-plant-defense-to-treatments-against-human-misuse-or-diseases
#6
EDITORIAL
Julien Barbier, Daniel Gillet
Ribosome inactivating proteins (RIPs) form a vast family of hundreds of toxins from plants, fungi, algae, and bacteria. RIP activities have also been detected in animal tissues. They exert an N-glycosydase catalytic activity that is targeted to a single adenine of a ribosomal RNA, thereby blocking protein synthesis and leading intoxicated cells to apoptosis. In many cases, they have additional depurinating activities that act against other nucleic acids, such as viral RNA and DNA, or genomic DNA. Although their role remains only partially understood, their functions may be related to plant defense against predators and viruses, plant senescence, or bacterial pathogenesis...
April 18, 2018: Toxins
https://www.readbyqxmd.com/read/29668950/secondary-bacterial-pneumonia-by-staphylococcus-aureus-following-influenza-a-infection-is-saer-s-dependent
#7
Timothy R Borgogna, Bennett Hisey, Emily Heitmann, Joshua J Obar, Nicole Meissner, Jovanka M Voyich
S. aureus is a predominant cause of fatal pneumonia following influenza A virus (IAV) infection. Herein we investigate the influence of antecedent IAV infection on S. aureus virulence gene expression. Using a murine model, comparing USA300 and USA300ΔsaeR/S strains, we demonstrate S. aureus pathogenesis following IAV infection is SaeR/S dependent. Furthermore, we show that IAV modulates the lung environment to rapidly up-regulate S. aureus virulence factors containing the SaeR-binding domain. Data demonstrate the pathogen response to IAV infection impacts host outcome and provides evidence that the ability of S...
April 13, 2018: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/29668262/visualization-of-mycobacterial-biomarkers-and-tuberculosis-drugs-in-infected-tissue-by-maldi-ms-imaging
#8
Landry Blanc, Anne J Lenaerts, Véronique Dartois, Brendan Prideaux
MALDI mass spectrometry imaging (MALDI-MSI) is a technique capable of label-free identification and visualization of analytes in tissue sections. We have previously applied MALDI-MSI to study the spatial distribution of tuberculosis (TB) drugs in necrotic lung granulomas characteristic of pulmonary TB disease, revealing heterogeneous and often suboptimal drug distribution. To investigate the impact of differential drug distribution at the sites of infection, we sought to image mycobacterial biomarkers to co-register drugs and bacteria in lesion sections...
April 18, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29666886/whole-genome-sequence-and-genome-annotation-of-xanthomonas-citri-pv-mangiferaeindicae-causal-agent-of-bacterial-black-spot-on-mangifera-indica
#9
Feng Liu, Xiong-Chang Ou, Ru-Lin Zhan
A newly isolated strain XC01 was identified as Xanthomonas citri pv. mangiferaeindicae, isolated from an infected mango fruit in Guangxi, China. The complete genome sequence of XC01 was carried out using the PacBio RSII platform. The genome contains a circular chromosome with 3,865,165 bp, 3442 protein-coding genes, 53 tRNAs, and 2 rRNA operons. Phylogenetic analysis revealed that this pathogen is very close to the soybeans bacterial pustule pathogen X. citri pv. glycines CFBP 2526, with a completely different host range...
April 17, 2018: Archives of Microbiology
https://www.readbyqxmd.com/read/29666608/capsular-sialyltransferase-specificity-mediates-different-phenotypes-in-streptococcus-suis-and-group-b-streptococcus
#10
David Roy, Daisuke Takamatsu, Masatoshi Okura, Guillaume Goyette-Desjardins, Marie-Rose Van Calsteren, Audrey Dumesnil, Marcelo Gottschalk, Mariela Segura
The capsular polysaccharide (CPS) represents a key virulence factor for most encapsulated streptococci. Streptococcus suis and Group B Streptococcus (GBS) are both well-encapsulated pathogens of clinical importance in veterinary and/or human medicine and responsible for invasive systemic diseases. S. suis and GBS are the only Gram-positive bacteria which express a sialylated CPS at their surface. An important difference between these two sialylated CPSs is the linkage between the side-chain terminal galactose and sialic acid, being α-2,6 for S...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29666285/type-ii-secretion-dependent-aminopeptidase-lapa-and-acyltransferase-plac-are-redundant-for-nutrient-acquisition-during-legionella-pneumophila-intracellular-infection-of-amoebas
#11
Richard C White, Felizza F Gunderson, Jessica Y Tyson, Katherine H Richardson, Theo J Portlock, James A Garnett, Nicholas P Cianciotto
Legionella pneumophila genes encoding LapA, LapB, and PlaC were identified as the most highly upregulated type II secretion (T2S) genes during infection of Acanthamoeba castellanii , although these genes had been considered dispensable on the basis of the behavior of mutants lacking either lapA and lapB or plaC A plaC mutant showed even higher levels of lapA and lapB transcripts, and a lapA lapB mutant showed heightening of plaC mRNA levels, suggesting that the role of the LapA/B aminopeptidase is compensatory with respect to that of the PlaC acyltransferase...
April 17, 2018: MBio
https://www.readbyqxmd.com/read/29666166/type-i-interferons-in-tuberculosis-foe-and-occasionally-friend
#12
REVIEW
Lúcia Moreira-Teixeira, Katrin Mayer-Barber, Alan Sher, Anne O'Garra
Tuberculosis remains one of the leading causes of mortality worldwide, and, despite its clinical significance, there are still significant gaps in our understanding of pathogenic and protective mechanisms triggered by Mycobacterium tuberculosis infection. Type I interferons (IFN) regulate a broad family of genes that either stimulate or inhibit immune function, having both host-protective and detrimental effects, and exhibit well-characterized antiviral activity. Transcriptional studies have uncovered a potential deleterious role for type I IFN in active tuberculosis...
April 17, 2018: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/29665864/recurrent-pregnancy-loss-is-associated-to-leaky-gut-a-novel-pathogenic-model-of-endometrium-inflammation
#13
C Tersigni, S D'Ippolito, F Di Nicuolo, R Marana, V Valenza, V Masciullo, F Scaldaferri, F Malatacca, C de Waure, A Gasbarrini, G Scambia, N Di Simone
BACKGROUND: Recurrent pregnancy loss (RPL) occurs in 3-5% in about 30% of cases no cause can be found. Women with RPL show higher prevalence of undiagnosed gut disorders. Furthermore, in endometrial tissues of RPL women, higher expression of pro-inflammatory cytokines and Nalp-3 inflammasome has been observed. Aim of this study was to investigate whether an abnormal gut permeability might occur in RPL women and allow passage into systemic circulation of pro-inflammatory molecules able to induce endometrial inflammation...
April 17, 2018: Journal of Translational Medicine
https://www.readbyqxmd.com/read/29662129/intracellular-replication-of-streptococcus-pneumoniae-inside-splenic-macrophages-serves-as-a-reservoir-for-septicaemia
#14
Giuseppe Ercoli, Vitor E Fernandes, Wen Y Chung, Joseph J Wanford, Sarah Thomson, Christopher D Bayliss, Kornelis Straatman, Paul R Crocker, Ashley Dennison, Luisa Martinez-Pomares, Peter W Andrew, E Richard Moxon, Marco R Oggioni
Bacterial septicaemia is a major cause of mortality, but its pathogenesis remains poorly understood. In experimental pneumococcal murine intravenous infection, an initial reduction of bacteria in the blood is followed hours later by a fatal septicaemia. These events represent a population bottleneck driven by efficient clearance of pneumococci by splenic macrophages and neutrophils, but as we show in this study, accompanied by occasional intracellular replication of bacteria that are taken up by a subset of CD169+ splenic macrophages...
April 16, 2018: Nature Microbiology
https://www.readbyqxmd.com/read/29661152/genetic-variability-in-the-sdrd-gene-in-staphylococcus-aureus-from-healthy-nasal-carriers
#15
Clement Ajayi, Espen Åberg, Fatemeh Askarian, Johanna U E Sollid, Mona Johannessen, Anne-Merethe Hanssen
BACKGROUND: Staphylococcus aureus cell wall anchored Serine Aspartate repeat containing protein D (SdrD) is a member of the microbial surface component recognising adhesive matrix molecules (MSCRAMMs). It is involved in the bacterial adhesion and virulence. However the extent of genetic variation in S. aureus sdrD gene within isolates from healthy carriers are not known. The aim of this study was to evaluate allelic variation of the sdrD gene among S. aureus from healthy nasal carriers...
April 16, 2018: BMC Microbiology
https://www.readbyqxmd.com/read/29658991/novel-de-novo-synthesized-phosphate-carrier-compound-aba-peg20k-pi20-suppresses-collagenase-production-in-enterococcus-faecalis-and-prevents-colonic-anastomotic-leak-in-an-experimental-model
#16
M Wiegerinck, S K Hyoju, J Mao, A Zaborin, C Adriaansens, E Salzman, N H Hyman, O Zaborina, H van Goor, J C Alverdy
BACKGROUND: Previous work has demonstrated that anastomotic leak can be caused by collagenolytic bacteria such as Enterococcus faecalis via an effect on wound collagen. In humans, E. faecalis is the organism cultured most commonly from a leaking anastomosis, and is not routinely eliminated by standard oral or intravenous antibiotics. Novel strategies are needed to contain the virulence of this pathogen when present on anastomotic tissues. METHODS: Polyphosphorylated polymer ABA-PEG20k-Pi20 was tested in mice for its ability to prevent anastomotic leak caused by collagenolytic E...
April 16, 2018: British Journal of Surgery
https://www.readbyqxmd.com/read/29657714/non-typeable-haemophilus-influenzae-detection-in-the-lower-airways-of-patients-with-lung-cancer-and-chronic-obstructive-pulmonary-disease
#17
Krishna B Sriram, Amanda J Cox, Pathmanathan Sivakumaran, Maninder Singh, Annabelle M Watts, Nicholas P West, Allan W Cripps
Background: Chronic airway inflammation and hypersensitivity to bacterial infection may contribute to lung cancer pathogenesis. Previous studies have demonstrated that nontypeable Haemophilus influenzae (NTHi) is the most common colonizing bacteria in the lower airways of patients with COPD. The objective of this study was to determine the presence of NTHi and immunoglobulin concentrations in patients with lung cancer, COPD and controls. Methods: Serum and bronchial wash samples were collected from patients undergoing diagnostic bronchoscopy...
2018: Multidisciplinary Respiratory Medicine
https://www.readbyqxmd.com/read/29653163/epstein-barr-virus-presence-as-a-potential-etiology-of-persistent-bladder-inflammation-in-human-interstitial-cystitis-bladder-pain-syndrome
#18
Jia-Fong Jhang, Yung-Hsiang Hsu, Chih-Wen Peng, Yuan-Hong Jiang, Han-Chen Ho, Hann-Chorng Kuo
PURPOSE: Interstitial cystitis/bladder pain syndrome is characterized by bladder inflammation without a bacterial infection. Although viral infection is a potential etiologic cause, few studies are reported. MATERIAL AND METHODS: Bladder specimens were obtained from patients with interstitial cystitis/bladder pain syndrome and patients with stress urinary incontinence (control). Bladder specimens were tested for Epstein-Barr-encoded RNAs by in situ hybridization, Epstein-Barr DNA by quantitative real-time polymerase chain reaction (qPCR), serology, and immunohistochemical staining...
April 10, 2018: Journal of Urology
https://www.readbyqxmd.com/read/29652241/bacterial-burden-in-critically-injured-ventilated-patients-does-not-correlate-with-progression-to-pneumonia
#19
Bradley M Dennis, Richard D Betzold, Daryl Patton, Herbert A Hopper, Judith Jenkins, Chris Fonnesbeck, Wonder Drake, Addison K May
BACKGROUND: Ventilator-associated pneumonia (VAP) is common in critically injured patients. The pathogenesis of VAP is not completely understood. We hypothesized that mechanically ventilated trauma patients who develop pneumonia have a progressive increase in pathogen burden over the course of ventilation until a threshold for symptomatic pneumonia is reached, leading to clinical suspicion of VAP. METHODS: Critically injured adults ventilated for more than two successive days were enrolled...
March 13, 2018: Surgical Infections
https://www.readbyqxmd.com/read/29649785/albumin-biofunctionalization-to-minimize-the-staphylococcus-aureus-adhesion-on-solid-substrates
#20
María Laura Martín, Valeria Pfaffen, Laura E Valenti, Carla E Giacomelli
Staphylococcus aureus has become the most common opportunistic microorganism related to nosocomial infections due to the bacteria capacity to form biofilms on biomedical devices and implants. Since bacterial adhesion is the first step in this pathogenesis, it is evident that inhibiting such a process will reduce the opportunity for bacterial colonization on the devices. This work is aimed at optimizing a surface biofunctionalization strategy to inhibit the adhesion of S. aureus on solid substrates. The first part of the work deals with the albumin adsorption-desorption process, studied by a factorial design of experiments to explore a wide range of experimental factors (protein concentration, pH, flow rate and adsorption time) and responses (initial adsorption rate, adsorbed amount, desorbed extent) for hydrophilic and hydrophobic substrates, with a reduced number of experiments...
April 3, 2018: Colloids and Surfaces. B, Biointerfaces
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