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https://www.readbyqxmd.com/read/28088477/selected-scorpion-toxin-exposures-induce-cytokine-release-in-human-peripheral-blood-mononuclear-cells
#1
Gerardo Corzo, Gerardo Pavel Espino-Solis
A cytokine screening on human peripheral blood mononuclear cells (PBMCs) stimulated with selected scorpion toxins (ScTx's) was performed in order to evaluate their effect on human immune cells. The ScTx's chosen for this report were three typical buthid scorpion venom peptides, one with lethal effects on mammals Centruroides suffussus suffusus toxin II (CssII), another, with lethal effects on insects and crustaceans Centruroides noxius toxin 5 (Cn5), and one more without lethal effects Tityus discrepans toxin (Discrepin)...
January 11, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28087840/vibrio-cholerae-cholix-toxin-induced-hepg2-cell-death-is-enhanced-by-tumor-necrosis-factor-alpha-through-ros-and-intracellular-signal-regulated-kinases
#2
Kohei Ogura, Yasuhiro Terasaki, Tohru Miyoshi-Akiyama, Mika Terasaki, Joel Moss, Masatoshi Noda, Kinnosuke Yahiro
Cholix toxin (Cholix) from Vibrio cholerae is a potent virulence factor exhibiting ADP-ribosyltransferase activity on eukaryotic elongation factor 2 (eEF2) of host cells, resulting in inhibition of protein synthesis. Administration of Cholix or its homologue Pseudomonas exotoxin A (PEA) to mice causes lethal hepatocyte damage. In this study, we demonstrate cytotoxicity of Cholix on immortalized human hepatocytes in the presence of tumor necrosis factor α (TNF-α), which has been reported to play a fatal role in PEA administered to mice...
January 13, 2017: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/28017248/treatment-of-blepharospasm-with-apraclonidine
#3
Dhanya Vijayakumar, Subhashie Wijemanne, Joseph Jankovic
OBJECTIVE: To describe improvement in blepharospasm with apraclonidine. BACKGROUND: Blepharospasm is a focal dystonia involving chiefly the orbicularis oculi and periocular muscles resulting in involuntary sustained eyelid closure. Botulinum toxin injection is the mainstay of treatment with meaningful improvement in over 85% of patients, but the effects often wear off within 3-4months. Apraclonidine is an alpha-2 adrenergic receptor agonist, which causes contraction of superior tarsal (Müller) muscle which may improve blepharospasm-related eyelid closure...
January 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28010961/synthetic-peptide-antigens-derived-from-long-chain-alpha-neurotoxins-immunogenicity-effect-against-elapid-venoms
#4
Guillermo de la Rosa, Nina Pastor, Alejandro Alagón, Gerardo Corzo
Three-finger toxins (3FTXs), especially α-neurotoxins, are the most poorly neutralized elapid snake toxins by current antivenoms. In this work, the conserved structural similarity and motif arrangements of long-chain α-neurotoxins led us to design peptides with consensus sequences. Eight long-chain α-neurotoxins (also known as Type II) were used to generate a consensus sequence from which two peptides were chemically synthesized, LCP1 and LCP2. Rabbit sera raised against them were able to generate partially-neutralizing antibodies, which delayed mice mortality in neutralization assays against Naja haje, Dendrospis polylepis and Ophiophagus hannah venoms...
December 21, 2016: Peptides
https://www.readbyqxmd.com/read/28007643/synergistic-effect-of-olfactory-ensheathing-cells-and-alpha-crystallin-on-restoration-of-adult-rat-optic-nerve-injury
#5
Yan Hua Wang, Zheng Qin Yin, Yi Wang
Olfactory enshesathing cells (OECs) and α-crystallin all can promote axonal regeneration after optic nerve injury. However, their mechanisms were different. Here, we study the synergistic effect of OECs and α-crystallin on the optic nerve regeneration. α-Crystallin was injected into vitreous cavity, and OECs were transplanted to the optic nerve injury area. The regeneration length of optic nerve were measured by anterograde tracing using cholera toxin subunit B (CTB). The survival of RGCs were assessed by counting the numbers of βIII-tubulin-labeled RGCs in a retinal whole mount...
December 19, 2016: Neuroscience Letters
https://www.readbyqxmd.com/read/27984062/rbaltmip-a-recombinant-alpha-type-myotoxin-inhibitor-from-bothrops-alternatus-rhinocerophis-alternatus-snake-as-a-potential-candidate-to-complement-the-antivenom-therapy
#6
Norival A Santos-Filho, Tiago S Sousa, Johara Boldrini-França, Ludier K Santos-Silva, Danilo L Menaldo, Flávio Henrique-Silva, Adélia C O Cintra, Helen J Laure, Carla C N Mamede, Fábio de Oliveira, Thalita B Riul, Marcelo Dias-Baruffi, José C Rosa, Suely V Sampaio
Phospholipase A2 inhibitors (PLIs) are important targets in the search and development of new drugs. This study aimed at evaluating the potential of an alpha-type phospholipase A2 inhibitor from Bothrops alternatus (Rhinocerophis alternatus) snake in its recombinant form (rBaltMIP) to complement the conventional antivenom therapy. Biochemical experiments showed that rBaltMIP presented pI 5.8 and molecular masses of ∼21 kDa by SDS-PAGE and 19.57 kDa by MALDI/TOF MS. After tryptic peptides sequencing, the results were compared with other PLIs available in databases, showing 100% identity between rBaltMIP and its native inhibitor BaltMIP and from 92% to 96% identity with other inhibitors...
October 28, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/27930371/effect-of-low-concentration-nonmydriatic-selective-alpha-adrenergic-agonist-eyedrops-on-upper-eyelid-position
#7
Taís B Mendonça, Atauíne P Lummertz, Francisco J L Bocaccio, Fernando Procianoy
BACKGROUND: Ptosis after botulinum toxin injection is a disturbing complication. Decongestant and antiglaucoma eyedrops are frequently prescribed for temporary improvement of eyelid ptosis. Although frequently cited on informal communications, the effect of these drugs on eyelid position has never been compared in a formal study. OBJECTIVE: To measure the effect of low-concentration, nonmydriatic selective alpha agonist eyedrops on upper eyelid position. METHODS AND MATERIALS: This nonrandomized clinical trial enrolled 20 healthy subjects aged 18 to 50 years...
December 2, 2016: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/27929417/atp-release-from-human-airway-epithelial-cells-exposed-to-staphylococcus-aureus-alpha-toxin
#8
Romina Baaske, Mandy Richter, Nils Möller, Sabine Ziesemer, Ina Eiffler, Christian Müller, Jan-Peter Hildebrandt
Airway epithelial cells reduce cytosolic ATP content in response to treatment with S. aureus alpha-toxin (hemolysin A, Hla). This study was undertaken to investigate whether this is due to attenuated ATP generation or to release of ATP from the cytosol and extracellular ATP degradation by ecto-enzymes. Exposure of cells to rHla did result in mitochondrial calcium uptake and a moderate decline in mitochondrial membrane potential, indicating that ATP regeneration may have been attenuated. In addition, ATP may have left the cells through transmembrane pores formed by the toxin or through endogenous release channels (e...
December 6, 2016: Toxins
https://www.readbyqxmd.com/read/27887025/design-and-expression-of-a-chimeric-vaccine-candidate-for-avian-necrotic-enteritis
#9
Amin Rostami, Fatemeh Goshadrou, Reza Pilehchian Langroudi, S Zahra Bathaie, Ali Riazi, Jafar Amani, Gholamreza Ahmadian
Necrotic enteritis is an economically important disease of poultry mainly caused by Clostridium perfringens The bacteria release multiple toxins of which NetB, alpha toxin and TpeL have been reported to play important roles in pathogenicity and/or severity of the disease. In this study, the sequence of clostridial toxins NetB, alpha toxin and TpeL were analyzed using bioinformatics tools to determine protein domains with high immunogenicity factor. Several chimeric trivalent proteins consisting of the immunogenic regions of the three toxins were designed and evaluated...
January 2017: Protein Engineering, Design & Selection: PEDS
https://www.readbyqxmd.com/read/27879630/recombinant-alpha-beta-and-epsilon-toxins-of-clostridium-perfringens-production-strategies-and-applications-as-veterinary-vaccines
#10
REVIEW
Marcos Roberto A Ferreira, Gustavo Marçal S G Moreira, Carlos Eduardo P da Cunha, Marcelo Mendonça, Felipe M Salvarani, Ângela N Moreira, Fabricio R Conceição
Clostridium perfringens is a spore-forming, commensal, ubiquitous bacterium that is present in the gastrointestinal tract of healthy humans and animals. This bacterium produces up to 18 toxins. The species is classified into five toxinotypes (A-E) according to the toxins that the bacterium produces: alpha, beta, epsilon, or iota. Each of these toxinotypes is associated with myriad different, frequently fatal, illnesses that affect a range of farm animals and humans. Alpha, beta, and epsilon toxins are the main causes of disease...
November 21, 2016: Toxins
https://www.readbyqxmd.com/read/27863510/establishing-a-reference-array-for-the-cs-%C3%AE-%C3%AE-superfamily-of-defensive-peptides
#11
D Ellen K Tarr
BACKGROUND: "Invertebrate defensins" belong to the cysteine-stabilized alpha-beta (CS-αβ), also known as the scorpion toxin-like, superfamily. Some other peptides belonging to this superfamily of defensive peptides are indistinguishable from "defensins," but have been assigned other names, making it unclear what, if any, criteria must be met to qualify as an "invertebrate defensin." In addition, there are other groups of defensins in invertebrates and vertebrates that are considered to be evolutionarily unrelated to those in the CS-αβ superfamily...
November 18, 2016: BMC Research Notes
https://www.readbyqxmd.com/read/27847174/protective-efficacy-of-a-novel-alpha-hemolysin-subunit-vaccine-at62-against-staphylococcus-aureus-skin-and-soft-tissue-infections
#12
Rajan P Adhikari, Christopher D Thompson, M Javad Aman, Jean C Lee
Alpha hemolysin (Hla) is a pore-forming toxin produced by most Staphylococcus aureus isolates. Hla is reported to play a key role in the pathogenesis of staphylococcal infections, such as skin and soft tissue infection, pneumonia, and lethal peritonitis. This study makes use of a novel recombinant subunit vaccine candidate (AT62) that was rationally designed based on the Hla heptameric crystal structure. AT62 comprises a critical structural domain at the N terminus of Hla, and it has no inherent toxic properties...
December 7, 2016: Vaccine
https://www.readbyqxmd.com/read/27824883/biomarkers-of-environmental-enteropathy-are-positively-associated-with-immune-responses-to-an-oral-cholera-vaccine-in-bangladeshi-children
#13
Muhammad Ikhtear Uddin, Shahidul Islam, Naoshin S Nishat, Motaher Hossain, Tanzeem Ahmed Rafique, Rasheduzzaman Rashu, Mohammad Rubel Hoq, Yue Zhang, Amit Saha, Jason B Harris, Stephen B Calderwood, Taufiqur Rahman Bhuiyan, Edward T Ryan, Daniel T Leung, Firdausi Qadri
Environmental enteropathy (EE) is a poorly understood condition that refers to chronic alterations in intestinal permeability, absorption, and inflammation, which mainly affects young children in resource-limited settings. Recently, EE has been linked to suboptimal oral vaccine responses in children, although immunological mechanisms are poorly defined. The objective of this study was to determine host factors associated with immune responses to an oral cholera vaccine (OCV). We measured antibody and memory T cell immune responses to cholera antigens, micronutrient markers in blood, and EE markers in blood and stool from 40 Bangladeshi children aged 3-14 years who received two doses of OCV given 14 days apart...
November 2016: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/27801366/evaluation-of-paiusp-subtyping-to-characterize-uropathogenic-e-coli-isolates
#14
Yun Mei Lai, Myo Thura Zaw, Shamsul Bahari Shamsudin, Zaw Lin
INTRODUCTION: Uropathogenic virulence factors have been identified by comparing the prevalence of these among urinary tract isolates and environmental strains. The uropathogenic-specific protein (USP) gene is present on the pathogenicity island (PAI) of uropathogenic Escherichia coli (UPEC) and, depending on its two diverse gene types and the sequential patterns of three open reading frame units (orfUs) following it, there is a method to characterize UPEC epidemiologically called PAIusp subtyping...
October 31, 2016: Journal of Infection in Developing Countries
https://www.readbyqxmd.com/read/27795368/safety-tolerability-and-pharmacokinetics-of-medi4893-an-investigational-extended-half-life-anti-staphylococcus-aureus-alpha-toxin-human-monoclonal-antibody-in-healthy-adults
#15
Xiang-Qing Yu, Gabriel J Robbie, Yuling Wu, Mark T Esser, Kathryn Jensen, Howard I Schwartz, Terramika Bellamy, Martha Hernandez-Illas, Hasan S Jafri
MEDI4893 is an investigational immunoglobulin G1(κ) monoclonal antibody that specifically binds to and neutralizes alpha-toxin, a key Staphylococcus aureus virulence factor. A triple-amino-acid substitution, M252Y/S254T/T256E, was engineered into the MEDI4893 Fc region to extend its serum half-life. A phase 1, double-blind, dose escalation study was designed to evaluate the safety, tolerability, pharmacokinetics, anti-alpha-toxin-neutralizing activity, and antidrug antibody (ADA) response of MEDI4893 following a single intravenous infusion in healthy adults 18 to 65 years of age...
January 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27789246/detection-of-toxigenic-clostridium-perfringens-and-clostridium-botulinum-from-food-sold-in-lagos-nigeria
#16
Emelda E Chukwu, Francisca O Nwaokorie, Akitoye O Coker, Mario J Avila-Campos, Rosa L Solis, Luis A Llanco, Folasade T Ogunsola
Food-borne diseases contribute to the huge burden of sickness and death globally and in the last decade, have become more frequently reported in Africa. In line with this, food safety is becoming a significant and growing public health problem in Nigeria. Diarrhoea is a common problem in Nigeria and has been reported but there has been little data on the possibility of clostridia as aetiological agents. Clostridium species are ubiquitous in the environment and in the gastrointestinal tract of man and animals and can serve as a marker for faecal contamination...
December 2016: Anaerobe
https://www.readbyqxmd.com/read/27785764/bacteriological-and-molecular-studies-of-clostridium-perfringens-infections-in-newly-born-calves
#17
A M Selim, M M Elhaig, I Zakaria, A Ali
Clostridium perfringens is considered one of the important causes of calf diarrhea. Two hundred and twenty-seven clinical samples from newly born and dead diarrheic calves were examined bacteriologically and by PCR. Bacterial culture identified C. perfringens in 168 of 227 samples. A total of 144 of these isolates were lecithinase positive, indicating C. perfringens Type A. In addition, 154 isolates were positive by alpha toxin encoding gene-PCR assay. This study showed high agreement between the results of bacteriology and multiplex PCR...
January 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/27784629/efficient-priming-of-cd4%C3%A2-t-cells-by-langerin-expressing-dendritic-cells-targeted-with-porcine-epidemic-diarrhea-virus-spike-protein-domains-in-pigs
#18
Sakthivel Subramaniam, Dianjun Cao, Debin Tian, Qian M Cao, Christopher Overend, Danielle M Yugo, Shannon R Matzinger, Adam J Rogers, C Lynn Heffron, Nicholas Catanzaro, Scott P Kenney, Tanja Opriessnig, Yao-Wei Huang, Geoffrey Labarque, Stephen Q Wu, Xiang-Jin Meng
Porcine epidemic diarrhea virus (PEDV) first emerged in the United States in 2013 causing high mortality and morbidity in neonatal piglets with immense economic losses to the swine industry. PEDV is an alpha-coronavirus replicating primarily in porcine intestinal cells. PEDV vaccines are available in Asia and Europe, and conditionally-licensed vaccines recently became available in the United States but the efficacies of these vaccines in eliminating PEDV from swine populations are questionable. In this study, the immunogenicity of a subunit vaccine based on the spike protein of PEDV, which was directly targeted to porcine dendritic cells (DCs) expressing Langerin, was assessed...
January 2, 2017: Virus Research
https://www.readbyqxmd.com/read/27776235/epigallocatechin-3-gallate-attenuates-microcystin-lr-induced-oxidative-stress-and-inflammation-in-human-umbilical-vein-endothelial-cells
#19
Jun Shi, Huiping Deng, Huichao Pan, Yinjie Xu, Min Zhang
Epigallocatechin-3-gallate (EGCG) has been shown to possess anti-inflammatory effects. Microcystin-LR (MC-LR) is a potent toxin and our past research suggested that it also mediated human umbilical vein endothelial cell (HUVEC) injury. The aim of this study was to investigate the effects of EGCG on MC-LR-induced oxidative stress and inflammatory responses in HUVECs. HUVECs were stimulated with MC-LR in the presence or absence of EGCG. MC-LR (40 μM) significantly increased cell death and decreased cell viability, migration, and tube formation, whereas EGCG (50 μM) inhibited these effects...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27739519/s-aureus-blocks-efferocytosis-of-neutrophils-by-macrophages-through-the-activity-of-its-virulence-factor-alpha-toxin
#20
Taylor S Cohen, Omari Jones-Nelson, Meghan Hotz, Lily Cheng, Lloyd S Miller, JoAnn Suzich, C Kendall Stover, Bret R Sellman
Bacterial pneumonia, such as those caused by Staphylococcus aureus, is associated with an influx of inflammatory neutrophils into the lung tissue and airways. Regulation and clearance of recruited neutrophils is essential for preventing tissue damage by "friendly fire", a responsibility of macrophages in a process called efferocytosis. We hypothesized that S. aureus impairs efferocytosis by alveolar macrophages (AMs) through the activity of the secreted virulence factor alpha toxin (AT), which has been implicated in altering the antimicrobial function of AMs...
October 14, 2016: Scientific Reports
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