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Phosphoethanolamine

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https://www.readbyqxmd.com/read/28429671/ethanolamine-metabolism-in-the-mammalian-gastrointestinal-tract-mechanisms-patterns-and-importance
#1
J Zhou, X Xiong, K Wang, L Zou, D Lv, Y Yin
Nutritional exchanges and cooperation between bacteria in the gastrointestinal tract and the mammalian host play an important role in health and disease. Ethanolamine is an essential dietary lipid nutrient for animals and is abundant in both intestinal and bacterial cell membranes. Ethanolamine can be utilized by intestinal eukaryotic cells via the cytidine phosphoethanolamine pathway for de novo synthesis of phosphatidylethanolamine, and certain bacteria are able to catabolize it as a major carbon and/or nitrogen source with the help of ethanolamine utilization proteins...
March 31, 2017: Current Molecular Medicine
https://www.readbyqxmd.com/read/28416554/in-vitro-study-of-isapl1-mediated-mobilization-of-the-colistin-resistance-gene-mcr-1
#2
Laurent Poirel, Nicolas Kieffer, Patrice Nordmann
The plasmid-mediated mcr-1 gene encodes a phosphoethanolamine transferase conferring resistance to polymyxins. The mcr-1 gene is associated with insertion sequence ISApl1 (IS30 family). In-vitro mobilization assays demonstrated the functionality of the composite transposon structure ISApl1-mcr-1-ISApl1 Transposition generated a 2-bp duplication and occurred in AT-rich DNA regions. This is the first report demonstrating the mobility of the mcr-1 gene by transposition.
April 17, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28415898/-31-phosphorus-magnetic-resonance-spectroscopy-of-the-liver-for-evaluating-inflammation-and-fibrosis-in-autoimmune-hepatitis
#3
Lauri Puustinen, Antti Hakkarainen, Reetta Kivisaari, Sonja Boyd, Urpo Nieminen, Martti Färkkilä, Nina Lundbom, Perttu Arkkila
BACKGROUND: Liver biopsy is the gold standard in evaluating inflammation and fibrosis in autoimmune hepatitis. AIMS: In search of non-invasive follow-up tools in autoimmune hepatitis, we evaluated (31)phosphorus magnetic resonance spectroscopy ((31)P MRS). METHODS: Twelve consecutive AIH patients (mean age 42.8 years, 10 women) underwent liver biopsy, routine laboratory liver function tests, which were compared to findings in (31)P MRS and transient elastography (TE)...
April 17, 2017: Scandinavian Journal of Gastroenterology
https://www.readbyqxmd.com/read/28407862/lipid-profiles-of-follicular-fluid-from-cows-submitted-to-ovarian-superstimulation
#4
P H Santos, P K Fontes, F F Franchi, M F G Nogueira, K R A Belaz, A Tata, M N Eberlin, M J Sudano, C M Barros, A C S Castilho
Ovarian superstimulation with exogenous gonadotropins has been extensively used to produce in vivo-derived embryos for embryo transfer in cattle. This process modifies the antral follicle microenvironment and affects oocyte and embryo quality as well the differentiation of granulosa cells. Lipids play significant roles in the cell, such as energy storage, cell structure, and fine-tuning of the physical properties and functions of biological membranes. The phospholipid (PL) contents as well as the effects of superstimulatory treatments on the PL profile of follicular fluid from cows, however, remain unknown...
May 2017: Theriogenology
https://www.readbyqxmd.com/read/28406235/physicochemical-characterizations-of-functional-hybrid-liposomal-nanocarriers-formed-using-photo-sensitive-lipids
#5
Sumit Kumar Pramanik, Patricia Losada-Pe Rez, Gunter Reekmans, Robert Carleer, Marc D'Olieslaeger, Dirk Vanderzande, Peter Adriaensens, Anitha Ethirajan
With recent advances in the field of diagnostics and theranostics, liposomal technology has secured a fortified position as a potential nanocarrier. Specifically, radiation/photo-sensitive liposomes containing photo-polymerizable cross-linking lipids are intriguing as they can impart the vesicles with highly interesting properties such as response to stimulus and improved shell stability. In this work, 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphoethanolamine (DTPE) is used as a photo-polymerizable lipid to form functional hybrid-liposomes as it can form intermolecular cross-linking through the diacetylenic groups...
April 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28401263/mutational-and-biochemical-findings-in-adults-with-persistent-hypophosphatasemia
#6
F E McKiernan, J Dong, R L Berg, E Scotty, P Mundt, L Larson, I Rai
A majority of adults with persistently low serum alkaline phosphatase values carry a pathogenic or likely pathogenic variant in the ALPL gene and also have elevated alkaline phosphatase substrate values in serum and urine. These adults may fall within the spectrum of the adult form of hypophosphatasia. INTRODUCTION: The primary objective of this study was to determine what proportion of adults with persistently low serum alkaline phosphatase values (hypophosphatasemia) harbor mutations in the ALPL gene or have elevated alkaline phosphatase (ALP) substrates...
April 12, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28377318/the-effect-of-thermosensitive-liposomal-formulations-on-loading-and-release-of-high-molecular-weight-biomolecules
#7
Xiaoyi Huang, Min Li, Riccardo Bruni, Piergiorgio Messa, Francesco Cellesi
Thermosensitive liposomes are clinically-relevant nanocarriers which have been used to deliver chemotherapeutic agents to tumors in combination with local hyperthermia. However, the encapsulation and release of macromolecular therapeutic agents (proteins, nucleic acids, bioactive polymers) is often hindered by their instability during the liposome formation as well as by the low encapsulation efficiency. The objective of this study was to investigate the influence of the thermosensitive liposomal formulation on the encapsulation and release of low and high molecular weight hydrophilic drugs, in order to identify the key parameters to control during nanocarrier design, depending on the specific drug delivery application...
April 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28376641/a-comprehensive-mathematical-model-of-drug-release-kinetics-from-nano-liposomes-derived-from-optimization-studies-of-cationic-pegylated-liposomal-doxorubicin-formulations-for-drug-gene-delivery
#8
Fateme Haghiralsadat, Ghasem Amoabediny, Marco N Helder, Samira Naderinezhad, Mohammad Hasan Sheikhha, Tymour Forouzanfar, Behrouz Zandieh-Doulabi
This study focuses on the development of a universal mathematical model for drug release kinetics from liposomes to allow in silico prediction of optimal conditions for fine-tuned controlled drug release. As a prelude for combined siRNA-drug delivery, nanoliposome formulations were optimized using various mole percentages of a cationic lipid (1,2-dioleoyl-3-trimethylammonium-propane, DOTAP) in the presence or absence of 3 mol% distearoyl phosphoethanolamine, polyethylene glycol (PEG-2000mDSPE). Outcome parameters were particle size, zeta potential, entrapment efficiency, in vitro drug release, and tumor cell kill efficiency...
April 4, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28373195/structural-modification-of-lipopolysaccharide-conferred-by-mcr-1-in-gram-negative-eskape-pathogens
#9
Yi-Yun Liu, Courtney E Chandler, Lisa M Leung, Christi L McElheny, Roberta T Mettus, Robert M Q Shanks, Jian-Hua Liu, David R Goodlett, Robert K Ernst, Yohei Doi
mcr-1 was initially reported as the first plasmid-mediated colistin resistance gene in clinical isolates of Escherichia coli and Klebsiella pneumoniae in China and has subsequently been identified worldwide in various species of the family Enterobacteriaceae. mcr-1 encodes a phosphoethanolamine transferase and its expression has been shown to generate phosphoethanolamine-modified bis-phosphorylated hexa-acylated lipid A in E. coli Here, we investigated the effect of mcr-1 on colistin susceptibility and lipopolysaccharide structures in laboratory and clinical strains of the Gram-negative ESKAPE pathogens, which are often treated by colistin clinically...
April 3, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28369040/phosphorylated-glycosphingolipids-essential-for-cholesterol-mobilization-in-caenorhabditis-elegans
#10
Sebastian Boland, Ulrike Schmidt, Vyacheslav Zagoriy, Julio L Sampaio, Raphael F Fritsche, Regina Czerwonka, Tilo Lübken, Jakob Reimann, Sider Penkov, Hans-Joachim Knölker, Teymuras V Kurzchalia
The nematode Caenorhabditis elegans requires exogenous cholesterol to survive and its depletion leads to early developmental arrest. Thus, tight regulation of cholesterol storage and distribution within the organism is indispensable. Here, we present a novel class of C. elegans phosphorylated glycosphingolipids, phosphoethanolamine glucosylceramides (PEGCs), capable of rescuing larval arrest induced by sterol starvation. We describe the total synthesis of a major PEGC species and demonstrate that the PEGC synthetic counterpart suppresses the dauer-constitutive phenotype of Niemann-Pick C1 (NPC1) and DAF-7/TGF-β mutant worms caused by impaired intracellular sterol trafficking...
April 3, 2017: Nature Chemical Biology
https://www.readbyqxmd.com/read/28352175/factors-influencing-transfection-efficiency-of-pidua-nanoemulsion-complexes-in-a-mucopolysaccharidosis-type-i-murine-model
#11
Michelle Fraga, Talita Giacomet de Carvalho, Juliana Bidone, Roselena Silvestri Schuh, Ursula Matte, Helder Ferreira Teixeira
Mucopolysaccharidosis type I (MPS I) is an autosomal disease caused by alpha-l-iduronidase (IDUA) deficiency. This study used IDUA knockout mice as a model to evaluate whether parameters such as dose of plasmid and time of treatment could influence the transfection efficiency of complexes formed with PEGylated cationic nanoemulsions and plasmid (pIDUA), which contains the gene that encodes for IDUA. Formulations were composed of medium chain triglycerides, 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine, 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-(amino[polyethylene glycol]-2000), 1,2-dioleoyl-sn-glycero-3-trimethylammonium propane (DOTAP), glycerol, and water and were prepared by the adsorption or encapsulation of preformed pIDUA-DOTAP complexes by high-pressure homogenization...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28344161/cross-resistance-to-human-cationic-antimicrobial-peptides-and-to-polymyxins-mediated-by-the-plasmid-encoded-mcr-1
#12
Jan Dobias, Laurent Poirel, Patrice Nordmann
OBJECTIVES: To evaluate whether acquired resistance to cationic antimicrobial peptides (CAMP) group molecules, being normal components of the human immune system, may select co-resistance to antibiotic peptides such as polymyxins, considering they share the same mechanism of action. We aimed to evaluate strains producing the recently identified plasmid-encoded polymyxin resistance determinant MCR-1, which is a phosphoethanolamine transferase that modifies the lipopolysaccharide structure of Gram-negative bacteria...
March 23, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28342805/phosphoethanolamine-addition-to-the-heptose-i-of-the-lipopolysaccharide-modifies-the-inner-core-structure-and-has-an-impact-on-the-binding-of-polymyxin-b-to-the-escherichia-coli-outer-membrane
#13
Javier Salazar, Mackarenna Alarcón, Jaime Huerta, Belén Navarro, Daniel Aguayo
Phosphoethanolamine (pEtN) decoration of E. coli Lipopolysaccharide (LPS) provides resistance to the antimicrobial Polymyxin B (PolB). While EptA and EptB enzymes catalyze the addition of pEtN to the Lipid A and Kdo (pEtN-Kdo-Lipid A), EptC catalyzes the pEtN addition to the Heptose I (pEtN-HeptI). In this study, we investigated the contribution of pEtN-HeptI to PolB resistance using eptA/eptB and eptC deficient E. coli K12 and its wild-type parent strains. These mutations were shown to decrease the antimicrobial activity of PolB on cells grown under pEtN-addition inducing conditions...
April 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28336574/switching-head-group-selectivity-in-mammalian-sphingolipid-biosynthesis-by-active-site-engineering-of-sphingomyelin-synthases
#14
Matthijs Kol, Radhakrishnan Panatala, Mirjana Nordmann, Leoni Swart, Leonie Van Suijlekom, Birol Cabukusta, Angelika Hilderink, Tanja Gabrietz, John G M Mina, Pentti Somerharju, Sergei Korneev, Fikadu G Tafesse, Joost C M Holthuis
Sphingomyelin (SM) is a fundamental component of mammalian cell membranes that contributes to mechanical stability, signaling and sorting. Its production involves the transfer of phosphocholine from phosphatidylcholine onto ceramide, a reaction catalyzed by SM synthase SMS1 in the Golgi and SMS2 at the plasma membrane. Mammalian cells also synthesize trace amounts of the SM analog ceramide phosphoethanolamine (CPE), but the physiological relevance of CPE production is unclear. Previous work revealed that SMS2 is a bifunctional enzyme producing both SM and CPE whereas a closely related enzyme, SMSr/SAMD8, acts as a monofunctional CPE synthase in the ER...
March 23, 2017: Journal of Lipid Research
https://www.readbyqxmd.com/read/28335220/pde5-inhibitors-loaded-nanovesicles-physico-chemical-properties-and-in-vitro-antiproliferative-activity
#15
Roberta F De Rose, Maria Chiara Cristiano, Marilena Celano, Valentina Maggisano, Ada Vero, Giovanni Enrico Lombardo, Martina Di Francesco, Donatella Paolino, Diego Russo, Donato Cosco
Novel therapeutic approaches are required for the less differentiated thyroid cancers which are non-responsive to the current treatment. In this study we tested an innovative formulation of nanoliposomes containing sildenafil citrate or tadalafil, phosphodiesterase-5 inhibitors, on two human thyroid cancer cell lines (TPC-1 and BCPAP). Nanoliposomes were prepared by the thin layer evaporation and extrusion methods, solubilizing the hydrophilic compound sildenafil citrate in the aqueous phase during the hydration step and dissolving the lipophilic tadalafil in the organic phase...
May 18, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28302399/elucidation-of-structural-and-functional-integration-of-a-novel-antimicrobial-peptide-from-antheraea-mylitta
#16
Suhrid R Dutta, Samiran S Gauri, Twisa Ghosh, Suman K Halder, Pradeep K DasMohapatra, Keshab C Mondal, Ananta K Ghosh
We report here the amino acid sequence of an antimicrobial peptide of Antheraea mylitta (peptide fraction II) effectively killed urinary tract associated MDR E. coli (Dutta et al., 2016), as Gly-Gly-Gly-Gly-Gly-Gly-His-Leu-Val-Ala. The physicochemical and biological properties of this peptide were evaluated by computational analysis and its isoelectric point, grand average of hydropathicity and Boman index values were found to be 6.74, 0.42 and -1.17kcal/mol, respectively. One valid model of peptide fraction II was constructed, that contains two antiparallel β sheets with a hairpin and appeared as 'U' shaped structure...
March 3, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28294967/single-lipid-molecule-dynamics-on-supported-lipid-bilayers-with-membrane-curvature
#17
Philip P Cheney, Alan W Weisgerber, Alec M Feuerbach, Michelle K Knowles
The plasma membrane is a highly compartmentalized, dynamic material and this organization is essential for a wide variety of cellular processes. Nanoscale domains allow proteins to organize for cell signaling, endo- and exocytosis, and other essential processes. Even in the absence of proteins, lipids have the ability to organize into domains as a result of a variety of chemical and physical interactions. One feature of membranes that affects lipid domain formation is membrane curvature. To directly test the role of curvature in lipid sorting, we measured the accumulation of two similar lipids, 1,2-Dihexadecanoyl-sn-glycero-3-phosphoethanolamine (DHPE) and hexadecanoic acid (HDA), using a supported lipid bilayer that was assembled over a nanopatterned surface to obtain regions of membrane curvature...
March 15, 2017: Membranes
https://www.readbyqxmd.com/read/28286316/a-simple-passive-equilibration-method-for-loading-carboplatin-into-pre-formed-liposomes-incubated-with-ethanol-as-a-temperature-dependent-permeability-enhancer
#18
Moe Wehbe, Armaan Malhotra, Malathi Anantha, Jeroen Roosendaal, Ada W Y Leung, David Plackett, Katarina Edwards, Roger Gilabert-Oriol, Marcel B Bally
A passive equilibration method which relies on addition of candidate drugs to pre-formed liposomes is described as an alternative method for preparing liposome encapsulated drugs. The method is simple, rapid and applicable to liposomes prepared with high (45mol%) or low (<20mol%) levels of cholesterol. Passive equilibration is performed in 4-steps: (i) formation of liposomes, (ii) addition of the candidate drug to the liposomes in combination with a permeability enhancing agent, (iii) incubation at a temperature that facilitates diffusion of the added compound across the lipid bilayer, and (iv) quenching the enhanced membrane permeability by reduction in temperature and/or removal of the permeabilization enhancer...
March 10, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28263303/pentamidine-sensitizes-gram-negative-pathogens-to-antibiotics-and-overcomes-acquired-colistin-resistance
#19
Jonathan M Stokes, Craig R MacNair, Bushra Ilyas, Shawn French, Jean-Philippe Côté, Catrien Bouwman, Maya A Farha, Arthur O Sieron, Chris Whitfield, Brian K Coombes, Eric D Brown
The increasing use of polymyxins(1) in addition to the dissemination of plasmid-borne colistin resistance threatens to cause a serious breach in our last line of defence against multidrug-resistant Gram-negative pathogens, and heralds the emergence of truly pan-resistant infections. Colistin resistance often arises through covalent modification of lipid A with cationic residues such as phosphoethanolamine-as is mediated by Mcr-1 (ref. 2)-which reduce the affinity of polymyxins for lipopolysaccharide(3). Thus, new strategies are needed to address the rapidly diminishing number of treatment options for Gram-negative infections(4)...
March 6, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28251974/-systemic-delivery-of-complexes-of-melanoma-rna-with-mannosylated-liposomes-activates-highly-efficient-murine-melanoma-specific-cytotoxic-t-cells-in-vivo
#20
O V Markov, N L Mironova, E V Shmendel, M A Maslov, M A Zenkova
The efficiency of the antitumor immune response triggered by dendritic cell (DC)-based vaccines depends predominantly on the efficiency of delivering tumor antigen-coding nucleic acids into DCs. Mannosylated liposomes were used to deliver tumor total RNA into DCs both ex vivo and in vivo, and the cytotoxic T-lymphocyte (CTL) antitumor response was assayed. The liposomes contained the mannosylated lipid conjugate 3-[6-(α-D-mannopyranosyloxy)hexyl]amino-4-{6-[rac-2,3-di(tetradecyloxy)prop-1-yl oxycarbonylamino]hexyl}aminocyclobut-3-en-1,2-dione), the polycationic lipid 2X3 (1,26-bis(cholest-5-en-3β-yloxycarbonylamino)-7,11,16,20-tetraazahexacosane tetrahydrochloride), and the zwitterionic lipid DOPE (1,2-dioleoyl-sn-glycero-3-phosphoethanolamine) at a molar ratio of 1: 3: 6 and were used as a transfection agent...
January 2017: Molekuliarnaia Biologiia
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