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Javier Molina-Infante, Alfredo J Lucendo
Eosinophilic esophagitis (EoE) is a chronic, immune-mediated, esophageal disease triggered predominantly, but not excusively, by food antigens. Presently, available food allergy tests are suboptimal to predict food triggers for EoE, especially in adults. Elemental diet (exclusive feeding with aminoacid-based formulas) and empiric six-food elimination diet (6-FED; withdrawing milk, wheat, egg, soy, nuts and fish/seafood for 6 weeks), have consistently shown the best efficacy rates. However, their high level of restriction and need for multiple endoscopies have hampered their implementation in clinical practice...
March 6, 2018: Journal of Allergy and Clinical Immunology
Deyamira Matuz-Mares, Alain Hernández-Vázquez, Héctor Riveros-Rosas, Raquel Guinzberg, Tania Quesada-López, Alfonso Cárabez-Trejo, Ofelia Mora, Enrique Piña
The physiological regulation of hepatic glutathione efflux by catecholamines is poorly understood. The purpose of this work was to review the role of adrenergic receptors (AR) on total glutathione (GT ) efflux in rat liver. Two models were used: isolated hepatocytes and perfused livers. In hepatocytes 10 μM adrenaline (Adr), but not isoproterenol (Iso) a β-AR agonist, or phenylephrine (Phe) an α1 -AR agonist, (in a Krebs-Henseleit Buffer (KHB) enriched with Ca2+ and some aminoacids) increased in 13% GT efflux...
February 26, 2018: Archives of Biochemistry and Biophysics
Enrico Perfetto, Davide Sangalli, Andrea Marini, Gianluca Stefanucci
The early stage density oscillations of the electronic charge in molecules irradiated by an attosecond XUV pulse takes place on femto- or subfemtosecond timescales. This ultrafast charge migration process is a central topic in attoscience as it dictates the relaxation pathways of the molecular structure. A predictive quantum theory of ultrafast charge migration should incorporate the atomistic details of the molecule, electronic correlations and the multitude of ionization channels activated by the broad-bandwidth XUV pulse...
March 1, 2018: Journal of Physical Chemistry Letters
Zekrayat J H Medras, Norhan M El-Sayed, Sawsan A Zaitone, Eman A Toraih, Manal M Sami, Yasser M Moustafa
BACKGROUND: Glutamine aminoacid regulates insulin exocytosis from pancreatic β-cells. Liraglutide is a glucagon-like peptide-1 (GLP-1) analogue that has fascinated function in inhibiting β-cell apoptosis and preserving pancreatic β-cell mass. The present study investigated the benefit of adding glutamine to a regimen of liraglutide in diabetic rats focusing on their role in increasing insulin production and upregulation of the expression of sodium-dependent neutral aminoacid transporter-2 (SNAT2)...
October 25, 2017: Pharmacological Reports: PR
Ana I Benítez-Mateos, Irantzu Llarena, Ana Sánchez-Iglesias, Fernando López Gallego
Fabrication of protein-based biomaterials is an arduous and time-consuming procedure with multiple steps. In this work, we describe a portable tool-kit that integrates both cell-free protein synthesis (CFPS) and protein immobilization in one-pot, just by mixing DNA, solid materials and a CFPS system. We construct a modular set of plasmids that fuse the N-terminus of superfolded Green Fluorescent Protein (sGFP) with different peptide-tags (poly-Cys, poly-His and poly-Lys), which drive the immobilization of the protein on the tailored material (agarose beads with different functionalities, gold nanorods and silica nanoparticles)...
February 23, 2018: ACS Synthetic Biology
Maria Elena Romero-Ibarguengoitia, Felipe Vadillo-Ortega, Augusto Enrique Caballero, Isabel Ibarra-González, Arturo Herrera-Rosas, María Fabiola Serratos-Canales, Mireya León-Hernández, Antonio González-Chávez, Srinivas Mummidi, Ravindranath Duggirala, Juan Carlos López-Alvarenga
BACKGROUND: Structural equation modeling (SEM) can help understanding complex functional relationships among obesity, non-alcoholic fatty liver disease (NAFLD), family history of obesity, targeted metabolomics and pro-inflammatory markers. We tested two hypotheses: 1) If obesity precedes an excess of free fatty acids that increase oxidative stress and mitochondrial dysfunction, there would be an increase of serum acylcarnitines, amino acids and cytokines in obese subjects. Acylcarnitines would be related to non-alcoholic fatty disease that will induce insulin resistance...
2018: PloS One
Serena Trubini, Alessandro Ubiali, Carlo Terenzio Paties, Luigi Cavanna
In melanoma, a number of specific genetic and genomic aberrations have been identified to be important in tumorigenesis. In particular, the mutant B-Raf proto-oncogene, Serine/Threonine kinase (BRAF) gene is the target of tailored therapy with kinase inhibitor molecules. Identification of the array of mutations in patients with melanoma will be useful in determining a genetic profile of the tumor with potential implications for treatment decisions. A rare aminoacidic insertion in codon 599 of the BRAF gene (c...
March 2018: Molecular and Clinical Oncology
Alicia Delrivo, Carolina Aloisio, Marcela R Longhi, Gladys Granero
We propose an in vitro permeability assay by using a modified lipid membrane to predict the in vivo intestinal passive permeability of drugs. Two conditions were tested, one with a gradient pH (pH 5.5 donor/pH 7.4 receptor) and the other with an iso-pH 7.4. The predictability of the method was established by correlating the obtained apparent intestinal permeability coefficients (P app ) and the oral dose fraction absorbed in humans (f a ) of 16 drugs with different absorption properties. The P app values correlated well with the absorption rates under the two conditions, and the method showed high predictability and good reproducibility...
February 15, 2018: AAPS PharmSciTech
Maria Bitsori, Eleni Vergadi, Emmanouil Galanakis
Cystinosis is a rare autosomal recessive lysosomal transport disorder, characterized by the accumulation of the aminoacid cystine and progressive dysfunction of several organs. Kidneys are severely affected, and the most frequent form, infantile nephropathic cystinosis, presents with growth failure in infancy, renal Fanconi syndrome and end-stage renal disease by the first decade of life. We report of a girl with infantile nephropathic cystinosis that has reached adolescence without the need of renal replacement therapy and without extrarenal manifestations despite her delayed diagnosis and treatment initiation...
February 14, 2018: CEN Case Reports
Saliha Esenboga, Deniz Çagdas, Tuba T Ozgur, Pınar Gur Çetinkaya, Lutfiye M Turkdemir, Ozden Sanal, Mirjam VanDer Burg, İlhan Tezcan
INTRODUCTION: X-linked agammaglobulinemia is a primary immunodeficiency disorder resulting from BTK gene mutations. There are many studies in the literature suggesting contradictory ideas about phenotype- genotype correlation. OBJECTIVE: The aim of this study was to identify the mutations and clinical findings of patients with XLA in Turkey, to determine long-term complications related to the disease and to analyze the phenotype-genotype correlation. MATERIALS AND METHODS: Thirty-two patients with XLA diagnosed between 1985-2016 in Pediatric Immunology Department of Hacettepe University Ihsan Dogramaci Children's Hospital were investigated...
February 9, 2018: Scandinavian Journal of Immunology
Maylein C Juan-Rivera, Magaly Martínez-Ferrer
Prostate cancer (PCa) is the most frequently diagnosed cancer and the third highest cause of cancer-related deaths in men in the U.S. The development of chemotherapeutic agents that can bind PCa tumor cells with high specificity is critical in order to increase treatment effectiveness. Integrin receptors and their corresponding ligands have different expression patterns in PCa cells. They have been identified as promising targets to inhibit pathways involved in PCa progression. Currently, several compounds have proven to target specific integrins and their subunits in PCa cells...
February 6, 2018: Cancers
Robert Smigiel, Anna Biernacka, Mateusz Biela, Victor Murcia-Pienkowski, Elzbieta Szmida, Piotr Gasperowicz, Joanna Kosinska, Grazyna Kostrzewa, Agnieszka Anna Koppolu, Anna Walczak, Dominik Wawrzuta, Malgorzata Rydzanicz, Malgorzata Sasiadek, Rafal Ploski
Overgrowth, macrocephaly, accelerated osseous maturation, variable intellectual disability, and characteristic facial features are the main symptoms of Weaver syndrome, a rare condition caused by mutations in EZH2 gene. Recently, in four patients with Weaver-like symptoms without mutations in EZH2 gene, pathogenic variants in EED were described. We present another patient clinically diagnosed with Weaver syndrome in whom WES revealed an EED de novo mutation affecting two neighboring aminoacids, NM_003797.3:c...
February 6, 2018: Journal of Human Genetics
S Lousinian, A R Mackie, N M Rigby, C Panayiotou, C Ritzoulis
The effect of mucin hydrogen bonding on the structure of intestinal mucus has been studied with micro-differential scanning mirocalorimetry (μ-DSC), supported by spectroscopy. The experiments were performed in water-dimethyl sulfoxide (DMSO) solutions, using either water-DMSO mixtures of an appropriate DMSO content or water as blanks, as to isolate the effects of the solvent to hydrogen bonding. When using matched water-DMSO blanks, thermal events at low temperatures are linked to the negation of mucin-DMSO interactions, while events at higher temperatures are linked to the break-up of hydrogen bonds connecting the sugars of the individual macromolecules...
January 30, 2018: International Journal of Biological Macromolecules
Florentina Tofoleanu, Ye Yuan, Frank C Pickard, Bartlomiej Tywoniuk, Bernard R Brooks, Nicolae-Viorel Buchete
Human Islet Amyloid Polypeptide (hIAPP), also known as Amylin, is a 37-aminoacid peptide, co-secreted with insulin and widely found in fibril form in type-2 diabetes patients. By using all-atom molecular dynamics simulations, we study hIAPP fibril segments (i.e., protofilaments) formed with sequences of naturally-occurring variants from cat, rat and pig, presenting different aggregation propensities. We characterize the effect of mutations on the structural dynamics of solution-formed hIAPP protofilament models built from solid-state NMR data...
February 6, 2018: Journal of Physical Chemistry. B
Gulmi Chakraborty, Madhurima Paul Chowdhury, Puthusserickal Abdulrahiman Hassan, Koji Tsuchiya, Kanjiro Torigoe, Swapan K Saha
The surface property of the cationic micelles of cetyltrimethylammonium bromide (CTAB) in aqueous medium is highly modified in presence of tyrosineoctyl ester (TYOE) and tyrosinedodecyl ester (TYDE), the models for aromatic aminoacid side chains of transmembrane proteins. While the synergistic interaction between quaternary ammonium head group of CTAB and the π-electron cloud of aromatic aminoacid ester is influenced by the relative orientation vis-à-vis unusual molecular geometry of the later, this eventually triggers morphology transition of the spherical micelle to cylindrical/wormlike micelles and impart strong viscoelasticity in the medium...
February 6, 2018: Journal of Physical Chemistry. B
Caroline Dufour, Alix Claudel, Nicolas Joubarne, Natacha Merindol, Tara Maisonnet, Nasser Masroori, Mélodie B Plourde, Lionel Berthoux
The type I interferon (IFN-I)-inducible human restriction factor TRIM5α inhibits the infection of human cells by specific nonhuman retroviruses, such as N-MLV and EIAV, but does not generally target HIV-1. However, the introduction of two aminoacid substitutions, R332G and R355G, in the human TRIM5α (huTRIM5α) domain responsible for retroviral capsid recognition leads to efficient HIV-1 restriction upon stable over-expression. CRISPR-Cas-based approaches to precisely edit DNA could be employed to modify TRIM5 in human cells...
2018: PloS One
Surajit Nandi, Debankur Bhattacharyya, Anakuthil Anoop
The HCN oligomerization is considered to be one of the important pathways in the chemical evolution. Nucleobases, aminoacids and many other complex organic molecules can be evolved through this pathway. We report an explorative study based on automated reaction search method that avoid the cognitive bias in searching the chemical reaction space. We have discussed the chemical space of HCN dimer elaborately, and the important trimers and tetramers are discussed briefly. A component wise molecular fingerprint based methodology is proposed for identifying molecular similarity...
January 25, 2018: Chemistry: a European Journal
Rosaria Costa, Andrea Salvo, Archimede Rotondo, Giovanni Bartolomeo, Vito Pellizzeri, Emanuele Saija, Sara Arrigo, Monica Interdonato, Alessandra Trozzi, Giacomo Dugo
The composition of juice and essential oil of Citrus limetta Risso was investigated. Multidimensional and enantio-gas chromatography were used for the elucidation of the volatile profile and the assessment of enantiomeric distribution. Predominant compounds were linalyl acetate (13.06 g/100 g), β-pinene (6.79 g/100 g), myrcene (1.40 g/100 g) and sabinene (1.05 g/100 g). Through a β-cyclodextrin column eight chiral pairs were separated, equally distributed between laevorotatory and dextrorotatory enantiomers...
January 22, 2018: Natural Product Research
Matteo Figliuzzi, Pierre Barrat-Charlaix, Martin Weigt
Global coevolutionary models of homologous protein families, as constructed by direct coupling analysis (DCA), have recently gained popularity in particular due to their capacity to accurately predict residueresidue contacts from sequence information alone, and thereby to facilitate tertiary and quaternary protein structure prediction. More recently, they have also been used to predict fitness effects of aminoacid substitutions in proteins, and to predict evolutionary conserved protein-protein interactions...
January 17, 2018: Molecular Biology and Evolution
Roman Rakitov, Alexander A Moysa, Arthur T Kopylov, Sergei A Moshkovskii, Ralph S Peters, Karen Meusemann, Bernhard Misof, Christopher H Dietrich, Kevin P Johnson, Lars Podsiadlowski, Kimberly K O Walden
Brochosomes (BS) are secretory granules resembling buckyballs, produced intracellularly in specialized glandular segments of the Malpighian tubules and forming superhydrophobic coatings on the integuments of leafhoppers (Hemiptera, Cicadellidae). Their composition is poorly known. Using a combination of SDS-PAGE, LC-MS/MS, next-generation sequencing (RNAseq) and bioinformatics we demonstrate that the major structural component of BS of the leafhopper Graphocephala fennahi Young is a novel family of 21-40-kDa secretory proteins, referred to herein as brochosomins (BSM), apparently cross-linked by disulfide bonds...
January 10, 2018: Insect Biochemistry and Molecular Biology
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