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Maeva Giraudo, Mélanie Douville, Robert J Letcher, Magali Houde
Brominated flame retardants (BFRs) represent a large group of chemicals used in a variety of household and commercial products to prevent fire propagation. The environmental persistence and toxicity of some of the most widely used BFRs has resulted in a progressive ban worldwide and the development of novel BFRs for which the knowledge on environmental health impacts remains limited. The objectives of this study were to evaluate the effects of two emerging BFRs, 1,2-bis(2,4,6-tribromophenoxy)ethane (BTBPE) and 2-ethylhexyl-2,3,4,5-tetrabromobenzoate (EH-TBB), in diet exposed juvenile rainbow trout (Oncorhynchus mykiss)...
May 2017: Aquatic Toxicology
Lei Shi, Lin Feng, Wei-Dan Jiang, Yang Liu, Jun Jiang, Pei Wu, Juan Zhao, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Xiao-Qiu Zhou
The aim of this study was to investigate the effect of dietary folic acid on fish growth, the immune and barrier functions of fish gills, and the potential mechanisms of these effects. Young grass carp (Ctenopharyngodon idella) were fed diets containing graded levels of folic acid at 0.10 (basal diet), 0.47, 1.03, 1.48, 1.88 and 3.12 mg kg(-1) diet for 8 weeks. The results showed that acid phosphatase and lysozyme activities and the complement component 3 content in fish gills decreased with folic acid deficiency (P < 0...
November 2015: Fish & Shellfish Immunology
Fei Yin, Hui Gong, Qiaozhen Ke, Anxing Li
To clarify the effects of a Cryptocaryon irritans infection on the stress, antioxidant and mucosal immune response of the large yellow croaker Pseudosciaena crocea, this study utilized C. irritans at dose of 12,000 (group I); 24,000 (group II); and 36,000 (group III) theronts/fish to infect large yellow croaker weighing 100 ± 10 g. The food intake, survival and relative infection intensity (RII); levels of reactive oxygen species (ROS), malondialdehyde (MDA) and vitamin C (VC), activities of super oxide dismutase (SOD) and catalase (CAT) in liver; variation patterns of lysozyme (LZM), alkaline phosphatase (AKP), complement component 3 (C3) and immunoglobulin M (IgM) levels in the body surface mucus at different time points after infection were compared...
November 2015: Fish & Shellfish Immunology
I Careba, A Chiva, M Totir, E Ungureanu, Sinziana Gradinaru
RATIONALE: Among the most frequently encountered pathologies examined by the ophthalmologist is dry eye syndrome (DE), which can be discovered particularly in the elderly. The initial diagnosis of DE is of high importance, but also challenging. This is because the biochemical changes in the tear film often develop before any detectable signs. OBJECTIVE: In this study, the possible relationship between ocular symptomatology, tear volume and tear break-up time (TBUT) and lipocalin, lactoferrin and lysozyme concentrations in the tear film were explored in a group of symptomatic dry-eyed postmenopausal (PM) women compared to age-matched controls...
2015: Journal of Medicine and Life
Antoon J M Ligtenberg, Henk S Brand, Petra A M van den Keijbus, Enno C I Veerman
OBJECTIVES: Saliva secretion is regulated by the autonomic nervous system. Parasympathic stimuli increase the secretion of water and mucin MUC5B, whereas sympathetic stimuli such as physical exercise increase the secretion of amylase and other proteins. In the present study we investigated the effect of physical exercise, as a sympathetic stimulus, on salivary flow rate and output of MUC5B, amylase, lysozyme and total protein. DESIGN: Unstimulated whole saliva was collected before exercise (1), after 10 min exercise with moderate intensity by running with a heart rate around 130 beats per minute (2), followed by 10 min exercise with high intensity by running to exhaustion (3) and after 30 min recovery (4)...
November 2015: Archives of Oral Biology
Alena S Sergeeva, Dmitry A Gorin, Dmitry V Volodkin
Development of tailor-made porous polymer scaffolds acting as a temporary tissue-construct for cellular organization is of primary importance for tissue engineering applications. Control over the gel porosity is a critical issue due to the need for cells to proliferate and migrate and to ensure the transport of nutrition and metabolites. Gel loading with bioactive molecules is desired for target release of soluble signals to guide cell function. Calcium-alginate hydrogels are one of the most popular gels successfully utilized as polymer scaffolds...
October 6, 2015: Langmuir: the ACS Journal of Surfaces and Colloids
Menghong Hu, Fangli Wu, Mingzhe Yuan, Qiongzhen Li, Yedan Gu, Youji Wang, Qigen Liu
Bloom forming algae and hypoxia are considered to be two main co-occurred stressors associated with eutrophication. The aim of this study was to evaluate the interactive effects of harmful algae Microcystis aeruginosa and hypoxia on an ecologically important mussel species inhabiting lakes and reservoirs, the triangle sail mussel Hyriopsis cumingii, which is generally considered as a bio-management tool for eutrophication. A set of antioxidant enzymes involved in immune defence mechanisms and detoxification processes, i...
November 2015: Chemosphere
Ruijun Li, Xiaobin Yang, Qiang Li, Shigen Ye, Hua Li
This study was conducted to evaluate the effects of dietary chitooligosaccharide (COS) supplementation on peripheral leukocyte count, head kidney leukocyte phagocytic rate, phagocytic index, respiratory burst activity, serum lysozyme activity, and immune protection in Paralichthys olivaceus. A total of 300 flounder with an average body weight of 80-100 g were randomly assigned into four dietary groups: (I) basic diet (control), basic diet containing (II) 0.5% COS, and (III) 1% COS, fed continuously for 28 d, and (IV) basic diet containing 1% COS fed in 14 d intervals...
November 2015: Fish & Shellfish Immunology
Sumit Kumar Chaturvedi, Nida Zaidi, Parvez Alam, Javed Masood Khan, Atiyatul Qadeer, Ibrar Ahmad Siddique, Shamoon Asmat, Yusra Zaidi, Rizwan Hasan Khan
Amyloid fibril formation by proteins leads to variety of degenerative disorders called amyloidosis. While these disorders are topic of extensive research, effective treatments are still unavailable. Thus in present study, two anti-tuberculosis drugs, i.e., pyrazinamide (PYZ) and D-cycloserine (DCS), also known for treatment for Alzheimer's dementia, were checked for the anti-aggregation and anti-amyloidogenic ability on Aβ-42 peptide and hen egg white lysozyme. Results demonstrated that both drugs inhibit the heat induced aggregation; however, PYZ was more potent and decelerated the nucleation phase as observed from various spectroscopic and microscopic techniques...
2015: PloS One
Yong-Po Chen, Wei-Dan Jiang, Yang Liu, Jun Jiang, Pei Wu, Juan Zhao, Sheng-Yao Kuang, Ling Tang, Wu-Neng Tang, Yong-An Zhang, Xiao-Qiu Zhou, Lin Feng
This study was conducted to investigate the effects of dietary phospholipids (PL) on the growth performance, intestinal enzyme activity and immune response and intestinal physical barrier of juvenile grass carp (Ctenopharyngodon idella). A total of 1080 juvenile grass carp with an average initial weight of 9.34 ± 0.03 g were fed six semi-purified diets containing 0.40% (unsupplemented control group), 1.43%, 2.38%, 3.29%, 4.37% and 5.42% PL for 2 months. Results indicated that 3.29% PL increased lysozyme (LZ) and acid phosphatase (ACP) activities and complement component 3 (C3) content (P < 0...
November 2015: Fish & Shellfish Immunology
Björn-Hendrik Peters, Jari T T Leskinen, Ferdinand Molnár, Jarkko Ketolainen
Microscale (MS) freeze-drying offers rapid process cycles for early-stage formulation development. The effects of the MS approach on the secondary structures of two model proteins, lysozyme and catalase, were compared with pilot-scale (PS) vial freeze-drying. The secondary structures were assessed by attenuated total reflection Fourier transformed infrared spectroscopy. Formulations were made with increasing sucrose-protein ratios. Freeze-drying protocols involved regular cooling without thermal treatment and annealing with MS and PS equipment, and cooling rate variations with the MS...
November 2015: Journal of Pharmaceutical Sciences
Katja Merches, Vishal Khairnar, Torben Knuschke, Namir Shaabani, Nadine Honke, Vikas Duhan, Mike Recher, Alexander A Navarini, Cornelia Hardt, Dieter Häussinger, Burkhard Tümmler, Erich Gulbins, Anthony H Futerman, Daniel Hoffmann, Florian Lang, Philipp A Lang, Astrid M Westendorf, Karl S Lang
BACKGROUND: Type I interferon (IFN-I) predisposes to bacterial superinfections, an important problem during viral infection or treatment with interferon-alpha (IFN-α). IFN-I-induced neutropenia is one reason for the impaired bacterial control; however there is evidence that more frequent bacterial infections during IFN-α-treatment occur independently of neutropenia. METHODS: We analyzed in a mouse model, whether Pseudomonas aeruginosa control is influenced by co-infection with the lymphocytic choriomeningitis virus (LCMV)...
2015: Cellular Physiology and Biochemistry
Valentin A Manuvera, Alexey S Kurdyumov, Kseniya A Filonova, Vassili N Lazarev
Destabilase-lysozyme (mlDL) is an enzyme secreted by the salivary gland cells of medicinal leeches. Destabilase-lysozyme possesses lysozyme and isopeptidase activities. We generated recombinant destabilase-lysozyme isoform 2 in three expression systems, i.e., in the bacteria Escherichia coli, in the yeast Pichia pastoris, and in the human cell line Expi293F. In E. coli, we generated both polypeptide in inclusion bodies that was later undergone to the refolding and soluble protein that had been fused with the chaperone SlyD...
December 2015: Protein Expression and Purification
Vito Foderà, Valeria Vetri, Thea S Wind, Wim Noppe, Claus Cornett, Athene M Donald, Ludmilla A Morozova-Roche, Bente Vestergaard
Formation of superstructures in protein aggregation processes has been indicated as a general pathway for several proteins, possibly playing a role in human pathologies. There is a severe lack of knowledge on the origin of such species in terms of both mechanisms of formation and structural features. We use equine lysozyme as a model protein, and by combining spectroscopic techniques and microscopy with X-ray fiber diffraction and ab initio modeling of Small Angle X-ray Scattering data, we isolate the partially unfolded state from which one of these superstructures (i...
September 18, 2014: Journal of Physical Chemistry Letters
Marco Antonio Góngora-Meléndez, Armando Magaña-Cobos, Juan Manuel Montiel-Herrera, Cinthya Lorena Pantoja-Minguela, Mario Luis Pineda-Maldonado, Eduardo Enrique Piñeyro-Beltrán
Food allergy prevalence has increased during the last years, affecting 15-20% of children, in this case, egg allergy affects from 0.5-2.5%. Most of the egg allergic reactions are type I or IgE mediated antibodies against egg proteins. Five major proteins have been identified: ovomucoid (Gal d1), ovoalbumin (Gal d2), ovotransferrin (Gal d3), lysozyme (Gal d4) and albumin (Gal d5). Ovomucoid protein, which is found in the egg white, is heat resistant and enzyme resistant. This protein is the most allergenic and the most common in egg composition...
July 2015: Revista Alergia Mexico: Organo Oficial de la Sociedad Mexicana de Alergia e Inmunología, A.C
Yi Shao, Yao Yu, Jing Yu, Chong-gang Pei, Gui-ping Gao, Ping Tu
OBJECTIVE: To investigate the efficiency of Spanishneedles Herb eye drops in treating perimenopausal xerophthalmia in rabbits. METHOD: Totally 36 rabbits (36 right eyes) were ovariectomized, and 2 months later divided into three groups: the experimental group (group A, n = 12) given Spanishneedles Herb eye drops, the control group (group B, n = 12) given PBS and the model group (group C, n = 12) given no drug. The Schirmer I test (SIT), fluorescent (FL), total tear protein, diastase activity, lactoferrin and lysozyme contents and confocal scanning microscopy were performed at before the treatment and at 1 w, 2 w, 1 mo, 2 mo after the treatment...
March 2015: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
I Ginsburg, E Koren, O Feuerstein, I P Zogakis, M Shalish, S Gorelik
The oxidant scavenging ability (OSA) of catalase-rich Candida albicans is markedly enhanced by chlorhexidine digluconate (CHX), polymyxin B, the bile salt ursodeoxycholate and by lysophosphatidylcholine, which all act as detergents facilitating the penetration of oxidants and their intracellular decomposition. Quantifications of the OSA of Candida albicans were measured by a highly sensitive luminol-dependent chemiluminescence assay and by the Thurman's assay, to quantify hydrogen peroxide (H2O2). The OSA enhancing activity by CHX depends to some extent on the media on which candida grew...
October 2015: Inflammopharmacology
H Zheng, A Mandal, I A Shumilin, M D Chordia, S Panneerdoss, J C Herr, W Minor
Sperm lysozyme-like protein 1 (SLLP1) is one of the lysozyme-like proteins predominantly expressed in mammalian testes that lacks bacteriolytic activity, localizes in the sperm acrosome, and exhibits high affinity for an oolemmal receptor, SAS1B. The crystal structure of mouse SLLP1 (mSLLP1) was determined at 2.15 Å resolution. mSLLP1 monomer adopts a structural fold similar to that of chicken/mouse lysozymes retaining all four canonical disulfide bonds. mSLLP1 is distinct from c-lysozyme by substituting two essential catalytic residues (E35T/D52N), exhibiting different surface charge distribution, and by forming helical filaments approximately 75 Å in diameter with a 25 Å central pore comprised of six monomers per helix turn repeating every 33 Å...
July 2015: Andrology
Lidice Bernardo, Honghui Yu, Alaa Amash, James C Zimring, Alan H Lazarus
Polyclonal anti-D has been used to prevent RhD-negative mothers from becoming immunized against RhD positive fetal erythrocytes, and this mechanism has been referred as Ab or IgG-mediated immune suppression (AMIS). Although anti-D has been highly successful, the inhibitory mechanisms remain poorly understood. Two major theories behind AMIS involve the binding of IgG to activating or inhibitory FcγR, which can induce either erythrocyte clearance or immune inhibition, respectively. In this work, we explored the absolute role of activating and inhibitory FcγR in the AMIS mechanism using the HOD mouse model of RBC immunization...
September 1, 2015: Journal of Immunology: Official Journal of the American Association of Immunologists
Vincent Artero, Gustav Berggren, Mohamed Atta, Giorgio Caserta, Souvik Roy, Ludovic Pecqueur, Marc Fontecave
Water splitting into oxygen and hydrogen is one of the most attractive strategies for storing solar energy and electricity. Because the processes at work are multielectronic, there is a crucial need for efficient and stable catalysts, which in addition have to be cheap for future industrial developments (electrolyzers, photoelectrochemicals, and fuel cells). Specifically for the water/hydrogen interconversion, Nature is an exquisite source of inspiration since this chemistry contributes to the bioenergetic metabolism of a number of living organisms via the activity of fascinating metalloenzymes, the hydrogenases...
August 18, 2015: Accounts of Chemical Research
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