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Streptolysin O

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https://www.readbyqxmd.com/read/29720109/altered-cerebral-glucose-metabolism-normalized-in-a-patient-with-a-pediatric-autoimmune-neuropsychiatric-disorder-after-streptococcal-infection-pandas-like-condition-following-treatment-with-plasmapheresis-a-case-report
#1
A H Nave, P Harmel, R Buchert, L Harms
BACKGROUND: Pediatric autoimmune neuropsychiatric disorder after streptococcal infection (PANDAS) is a specific autoimmune response to group-A streptococcal infections in children and adolescents with a sudden onset of obsessive-compulsive disorders or tic-like symptoms. Cerebral metabolic changes of patients have not yet been observed. CASE PRESENTATION: We present a case of an 18-year old male with a PANDAS-like condition after developing tic-like symptoms and involuntary movements three weeks after cardiac surgery...
May 2, 2018: BMC Neurology
https://www.readbyqxmd.com/read/29696021/soluble-n-ethylmaleimide-sensitive-factor-attachment-protein-receptor-derived-peptides-for-regulation-of-mast-cell-degranulation
#2
Yoosoo Yang, Byoungjae Kong, Younghoon Jung, Joon-Bum Park, Jung-Mi Oh, Jaesung Hwang, Jae Youl Cho, Dae-Hyuk Kweon
Vesicle-associated V-soluble N -ethylmaleimide-sensitive factor attachment protein receptor (SNARE) proteins and target membrane-associated T-SNAREs (syntaxin 4 and SNAP-23) assemble into a core trans -SNARE complex that mediates membrane fusion during mast cell degranulation. This complex plays pivotal roles at various stages of exocytosis from the initial priming step to fusion pore opening and expansion, finally resulting in the release of the vesicle contents. In this study, peptides with the sequences of various SNARE motifs were investigated for their potential inhibitory effects against SNARE complex formation and mast cell degranulation...
2018: Frontiers in Immunology
https://www.readbyqxmd.com/read/29686658/gut-microbiota-profiling-and-gut-brain-crosstalk-in-children-affected-by-pediatric-acute-onset-neuropsychiatric-syndrome-and-pediatric-autoimmune-neuropsychiatric-disorders-associated-with-streptococcal-infections
#3
Andrea Quagliariello, Federica Del Chierico, Alessandra Russo, Sofia Reddel, Giulia Conte, Loris R Lopetuso, Gianluca Ianiro, Bruno Dallapiccola, Francesco Cardona, Antonio Gasbarrini, Lorenza Putignani
Pediatric acute-onset neuropsychiatric syndrome (PANS) and pediatric autoimmune neuropsychiatric disorders associated with streptococcal infections syndrome (PANDAS) are conditions that impair brain normal neurologic function, resulting in the sudden onset of tics, obsessive-compulsive disorder, and other behavioral symptoms. Recent studies have emphasized the crosstalk between gut and brain, highlighting how gut composition can influence behavior and brain functions. Thus, the present study investigates the relationship between PANS/PANDAS and gut microbiota ecology...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29614382/extended-exposure-duration-of-cultured-intestinal-epithelial-cell-monolayers-in-characterizing-hazardous-and-non-hazardous-proteins
#4
C Zimmermann, A D Eaton, B B Lanter, J Roper, B P Hurley, B Delaney
Recent studies suggest that human derived intestinal epithelial cells (IECs) cultured as polarized monolayers on Transwell® filters may respond differently when exposed to hazardous and non-hazardous proteins. This experimental platform was based on apical exposure of IEC monolayers to test proteins for 24 h followed by assessment of barrier integrity and cell viability. In this study, Caco-2 and T84 IEC polarized monolayers were evaluated for barrier integrity and cytotoxicity following exposure to hazardous and non-hazardous proteins for 24, 48 and 72 h...
March 31, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29601325/group-a-streptococcus-infections-in-children-from-virulence-to-clinical-management
#5
Anne Botteaux, Isolda Budnik, Pierre R Smeesters
PURPOSE OF REVIEW: Recent findings have open new perspectives on group A Streptococcus (GAS) virulence understanding with special focus on the carrier stage and new hopes for an efficient vaccine against this important pathogen. RECENT FINDINGS: Understanding of carriage state, transmission and role of virulence factors in invasive infections have been recently active research fields questioning the link between carriage and infections and highlighting the potential to prevent invasive diseases...
March 29, 2018: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/29436150/broad-spectrum-neutralization-of-pore-forming-toxins-with-human-erythrocyte-membrane-coated-nanosponges
#6
Yijie Chen, Mengchun Chen, Yue Zhang, Joo Hee Lee, Tamara Escajadillo, Hua Gong, Ronnie H Fang, Weiwei Gao, Victor Nizet, Liangfang Zhang
Neutralization of bacterial toxins has become a compelling approach to treating bacterial infections as it may pose less selective pressure for the development of bacterial resistance. Currently, the majority of toxin neutralization platforms act by targeting the molecular structure of the toxin, which requires toxin identification and customized design for different diseases. Therefore, their development has been challenged by the enormous number and complexity of bacterial toxins. Herein, biomimetic toxin nanosponges are formulated by coating membranes of human red blood cells (hRBCs) onto polymeric nanoparticles, which act as a toxin decoy to absorb and neutralize a broad-spectrum of hemolytic toxins regardless of their molecular structure...
February 13, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29388112/use-of-streptolysin-o-induced-membrane-damage-as-a-method-of-studying-the-function-of-lipid-rafts-during-b-cell-activation
#7
Heather Miller, Wenxia Song
B-lymphocytes have the ability to repair their plasma membranes following injury, such as by bacterial cholesterol-dependent cytolysins. The repair process includes the removal of the pore from the inflicted region of the plasma membrane via lipid raft-mediated internalization. Lipid rafts are critical for B cell receptor (BCR) activation. Cholesterol-dependent pore forming bacterial toxins provide a useful tool for examining the role of lipid rafts in B cell activation and the underlying cellular mechanisms...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29386585/llo-mediated-cell-resealing-system-for-analyzing-intracellular-activity-of-membrane-impermeable-biopharmaceuticals-of-mid-sized-molecular-weight
#8
Masataka Murakami, Fumi Kano, Masayuki Murata
Cell-based assays have become increasingly important in the preclinical studies for biopharmaceutical products such as specialty peptides, which are of interest owing to their high substrate specificity. However, many of the latter are membrane impermeable and must be physically introduced into cells to evaluate their intracellular activities. We previously developed a "cell-resealing technique" that exploited the temperature-dependent pore-forming activity of the streptococcal toxin, streptolysin O (SLO), that enabled us to introduce various molecules into cells for evaluation of their intracellular activities...
January 31, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29337043/membrane-permeable-rab27a-is-a-regulator-of-the-acrosome-reaction-role-of-geranylgeranylation-and-guanine-nucleotides
#9
Matías A Bustos, Ornella Lucchesi, María C Ruete, Claudia N Tomes
The acrosome reaction is the regulated exocytosis of mammalian sperm's single secretory granule, essential for fertilization. It relies on small GTPases, the cAMP binding protein Epac, and the SNARE complex, among other components. Here, we describe a novel tool to investigate Rab27-related signaling pathways: a hybrid recombinant protein consisting of human Rab27A fused to TAT, a cell penetrating peptide. With this tool, we aimed to unravel the connection between Rab3, Rab27 and Rap1 in sperm exocytosis and to deepen our understanding about how isoprenylation and guanine nucleotides influence the behaviour of Rab27 in exocytosis...
April 2018: Cellular Signalling
https://www.readbyqxmd.com/read/29299196/extract-of-mouse-embryonic-stem-cells-induces-the-expression-of-pluripotency-genes-in-human-adipose-tissue-derived-stem-cells
#10
Paria Motamen Salehi, Tahereh Foroutan, Arash Javeri, Masoumeh Fakhr Taha
Objectives: In some previous studies, the extract of embryonic carcinoma cells (ECCs) and embryonic stem cells (ESCs) have been used to reprogram somatic cells to more dedifferentiated state. The aim of this study was to investigate the effect of mouse ESCs extract on the expression of some pluripotency markers in human adipose tissue-derived stem cells (ADSCs). Materials and Methods: Human ADSCs were isolated from subcutaneous abdominal adipose tissue and characterized by flow cytometric analysis for the expression of some mesenchymal stem cell markers and adipogenic and osteogenic differentiation...
November 2017: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/29129626/clinical-significance-of-the-serum-biomarker-index-detection-in-children-with-henoch-schonlein-purpura
#11
Narangerel Purevdorj, Yun Mu, Yajun Gu, Fang Zheng, Ran Wang, Jinwei Yu, Xuguo Sun
OBJECTIVE: To explore a panel of serum biomarkers for laboratory diagnosis of pediatric Henoch-Schönlein purpura (HSP). METHODS: The blood white blood cells (WBC) and serum levels of serum amyloid A (SAA), interleukin 6 (IL-6), immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM), immunoglobulin E (IgE), C-reactive protein (CRP), complement component 3 (C3), complement component 4 (C4), and ASO (anti-streptolysin O) were detected in 127 patients with Henoch-Schonlein purpura (HSP), 110 cases of septicemia patients, and 121 healthy volunteers...
February 2018: Clinical Biochemistry
https://www.readbyqxmd.com/read/29039828/-clinical-laboratory-and-instrumental-criteria-for-myocarditis-established-in-comparison-with-myocardial-biopsy-a-non-invasive-diagnostic-algorithm
#12
O V Blagova, Yu V Osipova, A V Nedostup, E A Kogan, V A Sulimov
AIM: To determine the diagnostic value of different clinical, laboratory, and instrumental signs in the diagnosis of myocarditis in patients with the picture of idiopathic arrhythmias, dilated cardiomyopathy (DCM) and in a comparison group when comparing with myocardial morphological examination. SUBJECTS AND METHODS: A study group included 100 patients (35 women; mean age, 44.7±12.5 years) with idiopathic arrhythmias (n=20) and DCM as a syndrome (n=100). All underwent myocardial morphological examination: endomyocardial biopsy (EMB) (n=71), intraoperative biopsy (n=13), study of the explanted heart (n=6), and autopsy (n=11)...
2017: Terapevticheskiĭ Arkhiv
https://www.readbyqxmd.com/read/29022027/the-first-successful-observation-of-in-cell-nmr-signals-of-dna-and-rna-in-living-human-cells
#13
Yudai Yamaoki, Ayaka Kiyoishi, Masayuki Miyake, Fumi Kano, Masayuki Murata, Takashi Nagata, Masato Katahira
In order to understand intracellular biological events, information on the structure, dynamics and interaction of proteins and nucleic acids in living cells is of crucial importance. In-cell NMR is a promising method to obtain this information. Although NMR signals of proteins in human cells have been reported, those of nucleic acids were reported only in Xenopus laevis oocytes, i.e., not in human cells. Here, DNA and RNA were introduced into human cells by means of pore formation by bacterial toxin streptolysin O and subsequent resealing...
October 12, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28939394/enzyme-linked-immunosorbent-assay-for-group-a-streptococcal-anti-dnase-b-in-human-sera-using-recombinant-proteins-comparison-to-the-dna-methyl-green-micromethod
#14
COMPARATIVE STUDY
Sarita Das, T Dileepan, D R Johnson, E L Kaplan, P Patrick Cleary
Among the four known Streptococcal nucleases comprising of DNase A, B, C and D; DNase B is the most common, and determination of the levels of antibody to DNase B (ADB) is often used to confirm a clinical diagnosis of Streptococcus pyogenes/group A Streptococcal (GAS) infection. The commonly used assays for antibodies that neutralize DNase B or streptolysin O activity use partially purified antigens that often fail to detect antibody changes subsequent to culture documented infections. Therefore, an enzyme-linked immunosorbent assay (ELISA) was developed employing his-tagged recombinant DNase B as plate antigen for comparison to the commonly used DNA methyl green micromethod (DMGM)...
December 2017: Journal of Immunological Methods
https://www.readbyqxmd.com/read/28928212/population-and-whole-genome-sequence-based-characterization-of-invasive-group-a-streptococci-recovered-in-the-united-states-during-2015
#15
Sopio Chochua, Ben J Metcalf, Zhongya Li, Joy Rivers, Saundra Mathis, Delois Jackson, Robert E Gertz, Velusamy Srinivasan, Ruth Lynfield, Chris Van Beneden, Lesley McGee, Bernard Beall
Group A streptococci (GAS) are genetically diverse. Determination of strain features can reveal associations with disease and resistance and assist in vaccine formulation. We employed whole-genome sequence (WGS)-based characterization of 1,454 invasive GAS isolates recovered in 2015 by Active Bacterial Core Surveillance and performed conventional antimicrobial susceptibility testing. Predictions were made for genotype, GAS carbohydrate, antimicrobial resistance, surface proteins (M family, fibronectin binding, T, R28), secreted virulence proteins (Sda1, Sic, exotoxins), hyaluronate capsule, and an upregulated nga operon (encodes NADase and streptolysin O) promoter (Pnga3)...
September 19, 2017: MBio
https://www.readbyqxmd.com/read/28900445/anaphylactoid-purpura-associated-with-streptococcal-cellulitis-a-case-report-and-literature-review
#16
Yuko Saito, Susumu Ookawara, Hisataka Uchima, Takeshi Ishida, Masafumi Kakei, Hitoshi Sugawara
A 54-year-old Japanese man noticed painful swelling and redness of his left leg. He was admitted for treatment of cellulitis, which was accompanied with increased anti-streptolysin O and anti-streptokinase titers in his clinical course. After Piperacillin/Tazobactam administration, the skin lesion resolved. However, the patient then developed arthritis, palpable purpura, and intermittent abdominal pain, later found to be secondary to a severe duodenal ulcer. He was diagnosed with cellulitis-associated anaphylactoid purpura and was given prednisolone, which dramatically improved his symptoms...
2017: Case Reports in Medicine
https://www.readbyqxmd.com/read/28900022/binding-of-nad-glycohydrolase-to-streptolysin-o-stabilizes-both-toxins-and-promotes-virulence-of-group-a-streptococcus
#17
Jorge J Velarde, Maghnus O'Seaghdha, Buket Baddal, Benedicte Bastiat-Sempe, Michael R Wessels
The globally dominant, invasive M1T1 strain of group A Streptococcus (GAS) harbors polymorphisms in the promoter region of an operon that contains the genes encoding streptolysin O (SLO) and NAD(+)-glycohydrolase (NADase), resulting in high-level expression of these toxins. While both toxins have been shown experimentally to contribute to pathogenesis, many GAS isolates lack detectable NADase activity. DNA sequencing of such strains has revealed that reduced or absent enzymatic activity can be associated with a variety of point mutations in nga, the gene encoding NADase; a commonly observed polymorphism associated with near-complete abrogation of activity is a substitution of aspartic acid for glycine at position 330 (G330D)...
September 12, 2017: MBio
https://www.readbyqxmd.com/read/28769806/a-red-blood-cell-membrane-camouflaged-nanoparticle-counteracts-streptolysin-o-mediated-virulence-phenotypes-of-invasive-group-a-streptococcus
#18
Tamara Escajadillo, Joshua Olson, Brian T Luk, Liangfang Zhang, Victor Nizet
Group A Streptococcus (GAS), an important human-specific Gram-positive bacterial pathogen, is associated with a broad spectrum of disease, ranging from mild superficial infections such as pharyngitis and impetigo, to serious invasive infections including necrotizing fasciitis and streptococcal toxic shock syndrome. The GAS pore-forming streptolysin O (SLO) is a well characterized virulence factor produced by nearly all GAS clinical isolates. High level expression of SLO is epidemiologically linked to intercontinental dissemination of hypervirulent clonotypes and poor clinical outcomes...
2017: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/28720729/inhibition-of-inflammasome-dependent-interleukin-1%C3%AE-production-by-streptococcal-nad-glycohydrolase-evidence-for-extracellular-activity
#19
Dóra Hancz, Elsa Westerlund, Benedicte Bastiat-Sempe, Onkar Sharma, Christine Valfridsson, Lena Meyer, John F Love, Maghnus O'Seaghdha, Michael R Wessels, Jenny J Persson
Group A Streptococcus (GAS) is a common human pathogen and the etiologic agent of a large number of diseases ranging from mild, self-limiting infections to invasive life-threatening conditions. Two prominent virulence factors of this bacterium are the genetically and functionally linked pore-forming toxin streptolysin O (SLO) and its cotoxin NAD(+)-glycohydrolase (NADase). Overexpression of these toxins has been linked to increased bacterial virulence and is correlated with invasive GAS disease. NADase can be translocated into host cells by a SLO-dependent mechanism, and cytosolic NADase has been assigned multiple properties such as protection of intracellularly located GAS bacteria and induction of host cell death through energy depletion...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28662157/sex-dependent-aortic-valve-pathology-in-patients-with-rheumatic-heart-disease
#20
Feng Xiao, Rui Zheng, Di Yang, Kejiang Cao, Shijiang Zhang, Bingruo Wu, Yongfeng Shao, Bin Zhou
BACKGROUND: Rheumatic heart disease is an autoimmune disease caused by group A streptococci infection and frequently affects the aortic valve. Sex differences are common in the disease progression, treatment, and outcome. However, little is known about the sex differences in the pathology of aortic valves in rheumatic heart disease. DESIGN: We studied the end-stage calcific aortic valves from male versus female patients to reveal the sex-dependent pathology differences and molecular changes associated with requiring valve replacement...
2017: PloS One
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