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https://www.readbyqxmd.com/read/29150896/stereospecific-control-of-peptide-gas-phase-ion-chemistry-with-cis-and-trans-cyclo-ornithine-residues
#1
Aleš Marek, Huong T H Nguyen, Břetislav Brož, František Tureček
We report non-chiral amino acid residues cis- and trans-1,4-diaminocyclohexane-1-carboxylic acid (cyclo-ornithine, cO) that exhibit unprecedented stereospecific control of backbone dissociations of singly charged peptide cations and hydrogen-rich cation radicals produced by electron-transfer dissociation (ETD). Upon collision-induced dissociation (CID) in the slow heating regime, peptide cations containing trans-cO residues undergo facile backbone cleavages of amide bonds C-terminal to trans-cO. In contrast, peptides with cis-cO residues undergo dissociations at several amide bonds along the peptide ion backbone...
November 18, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29148709/nir-emitting-nanoprobes-based-on-cyclic-rgd-motif-conjugated-pbs-quantum-dots-for-integrin-targeted-optical-bioimaging
#2
Nicoletta Depalo, Michela Corricelli, Ivan de Paola, Gianpiero Valente, Rosa M Iacobazzi, Emiliano Altamura, Doriana Debellis, Daniela Comegna, Elisabetta Fanizza, Nunzio Denora, Valentino Laquintana, Fabio Mavelli, Marinella Striccoli, Michele Saviano, Angela Agostiano, Annarita Del Gatto, Laura Zaccaro, Maria Lucia Curri
Here, silica coated PbS quantum dots (QDs) with photoluminesce emission properties in the near-infrared (NIR) region are proposed as potential effective single particle optical nanoprobes for future in vivo imaging of tumors. The dispersibility in aqueous medium of hydrophobic PbS QDs was accomplished by growing a silica shell on their surface by exploiting a base assisted water-in-oil microemulsion method. The silica coated PbS QDs were then conjugated with specifically designed cyclic arginine-glycine-aspartic acid (cRGD) peptide, that are able to specifically recognizes the αvβ3 integrins which is overexpressed in the angiogenic tumor induced vasculatures and on some solid tumours, in order to achieve a tumor-specific targeting...
November 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29148316/recognition-dynamics-of-trinuclear-copper-cluster-and-associated-histidine-residues-through-conserved-or-semi-conserved-water-molecules-in-human-ceruloplasmin-the-involvement-of-aspartic-and-glutamic-acid-gates
#3
Bishnu Prasad Mukhopadhyay
Human Ceruloplasmin belongs to the family of multi-copper oxidases and it is involved in different physiological processes, copper ion transport, iron metabolism, iron homeostasis, and biogenic amine metabolism. MD-simulation studies have indicated the higher hydrophilic susceptibility of the trinuclear copper cluster in native CP compared to its oxygen bound form. The copper (T2/T3) atom Cu3047 of the cluster, which is close to T1 copper center Cu3052 (~13 Å) has a higher affinity for water molecules compared to other copper centers...
November 17, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/29146975/disturbance-in-plasma-metabolic-profile-in-different-types-of-human-cytomegalovirus-induced-liver-injury-in-infants
#4
Wei-Wei Li, Jin-Jun Shan, Li-Li Lin, Tong Xie, Li-Li He, Yan Yang, Shou-Chuan Wang
Human cytomegalovirus (HCMV) infection in infants is a global problem and the liver is a target organ of HCMV invasion. However, the mechanism by which HCMV causes different types of liver injury is unclear, and there are many difficulties in the differential diagnosis of HCMV infantile cholestatic hepatopathy (ICH) and extrahepatic biliary atresia (EHBA). We established a non-targeted gas chromatography-mass spectrometry metabolomics method in conjunction with orthogonal partial least squares-discriminate analysis based on 127 plasma samples from healthy controls, and patients with HCMV infantile hepatitis, HCMV ICH, and HCMV EHBA to explore the metabolite profile of different types of HCMV-induced liver injury...
November 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29146449/an-integrated-metabolic-consequence-of-hepatospora-eriocheir-infection-in-the-chinese-mitten-crab-eriocheir-sinensis
#5
Zhengfeng Ding, Jing Pan, Hua Huang, Gongcheng Jiang, Jianqin Chen, Xueshen Zhu, Renlei Wang, Guohua Xu
Despite the economic and evolutionary importance of aquatic host-infecting microsporidian species, at present, limited information has been provided about the microsporidia-host interactions. This study focused on Hepatospora eriocheir, an emerging microsporidian pathogen for the Chinese mitten crab Eriocheir sinensis. Hypertrophy of hepatopancreas cells was a common feature of H. eriocheir infection. More importantly, mitochondria of the hepatopancreas were drawn around the H. eriocheir, most likely to aid the uptake of ATP directly from the host...
November 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/29145892/association-between-plasma-phospholipid-saturated-fatty-acids-and-metabolic-markers-of-lipid-hepatic-inflammation-and-glycaemic-pathways-in-eight-european-countries-a-cross-sectional-analysis-in-the-epic-interact-study
#6
Ju-Sheng Zheng, Stephen J Sharp, Fumiaki Imamura, Albert Koulman, Matthias B Schulze, Zheng Ye, Jules Griffin, Marcela Guevara, José María Huerta, Janine Kröger, Ivonne Sluijs, Antonio Agudo, Aurelio Barricarte, Heiner Boeing, Sandra Colorado-Yohar, Courtney Dow, Miren Dorronsoro, Pia T Dinesen, Guy Fagherazzi, Paul W Franks, Edith J M Feskens, Tilman Kühn, Verena Andrea Katzke, Timothy J Key, Kay-Tee Khaw, Maria Santucci de Magistris, Francesca Romana Mancini, Elena Molina-Portillo, Peter M Nilsson, Anja Olsen, Kim Overvad, Domenico Palli, Jose Ramón Quirós, Olov Rolandsson, Fulvio Ricceri, Annemieke M W Spijkerman, Nadia Slimani, Giovanna Tagliabue, Anne Tjonneland, Rosario Tumino, Yvonne T van der Schouw, Claudia Langenberg, Elio Riboli, Nita G Forouhi, Nicholas J Wareham
BACKGROUND: Accumulating evidence suggests that individual circulating saturated fatty acids (SFAs) are heterogeneous in their associations with cardio-metabolic diseases, but evidence about associations of SFAs with metabolic markers of different pathogenic pathways is limited. We aimed to examine the associations between plasma phospholipid SFAs and the metabolic markers of lipid, hepatic, glycaemic and inflammation pathways. METHODS: We measured nine individual plasma phospholipid SFAs and derived three SFA groups (odd-chain: C15:0 + C17:0, even-chain: C14:0 + C16:0 + C18:0, and very-long-chain: C20:0 + C22:0 + C23:0 + C24:0) in individuals from the subcohort of the European Prospective Investigation into Cancer and Nutrition (EPIC)-InterAct case-cohort study across eight European countries...
November 17, 2017: BMC Medicine
https://www.readbyqxmd.com/read/29143452/engineering-improved-variants-of-the-antifungal-peptide-histatin-5-with-reduced-susceptibility-to-candida-albicans-secreted-aspartic-proteases-and-enhanced-antimicrobial-potency
#7
Svetlana P Ikonomova, Parisa Moghaddam-Taaheri, Mary Ann Jabra-Rizk, Yan Wang, Amy J Karlsson
Candida albicans is an opportunistic fungal pathogen and a commensal organism that commonly colonizes mucosal surfaces, including those inside the human mouth. To help control C. albicans, human saliva contains the antifungal peptide histatin 5 (Hst-5), which has strong antifungal activity against C. albicans. However, the pathogen produces secreted aspartic proteases (Saps) that cleave Hst-5 at lysine residues and eliminate its antifungal properties. We designed variants of Hst-5 with its lysine residues substituted with arginine or leucine to evaluate the effect on proteolysis by Saps...
November 15, 2017: FEBS Journal
https://www.readbyqxmd.com/read/29143132/thermostable-and-highly-specific-l-aspartate-oxidase-from-thermococcus-litoralis-dsm-5473-cloning-overexpression-and-enzymological-properties
#8
Tsubasa Washio, Tadao Oikawa
We successfully expressed the L-aspartate oxidase homolog gene (accession no: OCC_06611) of Thermococcus litoralis DSM 5473 in the soluble fraction of Escherichia coli BL21 (DE3) using a pET21b vector with 6X His tag at its C-terminus. The gene product (Tl-LASPO) showed L-aspartate oxidase activity in the presence of FAD in vitro, and this report is the first that details an L-aspartate oxidase derived from a Thermococcus species. The homologs of Tl-LASPO existed mainly in archaea, especially in the genus of Thermococcus, Pyrococcus, Sulfolobus, and Halobacteria...
November 15, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29142422/chemotaxonomic-diversity-of-three-ficus-species-their-discrimination-using-chemometric-analysis-and-their-role-in-combating-oxidative-stress
#9
Nawal Al-Musayeib, Sherif S Ebada, Haidy A Gad, Fadia S Youssef, Mohamed Lotfy Ashour
Background: Genus Ficus (Moraceae) constitutes more than 850 species and about 2000 varieties and it acts as a golden mine that could afford effective and safe remedies combating many health disorders. Objectives: Discrimination of Ficus cordata, Ficus ingens, and Ficus palmata using chemometric analysis and assessment of their role in combating oxidative stress. Materials and Methods: Phytochemical profiling of the methanol extracts of the three Ficus species and their successive fractions was performed using high-performance liquid chromatography/electrospray ionization mass spectrometry...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142421/extract-of-bauhinia-vahlii-shows-antihyperglycemic-activity-reverses-oxidative-stress-and-protects-against-liver-damage-in-streptozotocin-induced-diabetic-rats
#10
Ahmed H Elbanna, Mohammed M Nooh, Engy A Mahrous, Amal E Khaleel, Taha S Elalfy
Background: Several studies have affirmed the effectiveness of some Bauhinia plants as antihyperglycemic agents. Objective: We investigated the possible effect of Bauhinia vahlii leaves extract in reducing hyperglycemia and reversing signs of organ damage associated with diabetes in streptozotocin (STZ) rat model. Materials and Methods: Both polar fraction of the B. vahlii leaves (defatted ethanolic extract [DEE]) and nonpolar fraction (n-hexane extract) were evaluated in vitro for α-glucosidase inhibition and 2,2-diphenyl-1-picrylhydrazyl radical scavenging potential...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142404/chalepin-a-compound-from-ruta-angustifolia-l-pers-exhibits-cell-cycle-arrest-at-s-phase-suppresses-nuclear-factor-kappa-b-nf-%C3%AE%C2%BAb-pathway-signal-transducer-and-activation-of-transcription-3-stat3-phosphorylation-and-extrinsic-apoptotic-pathway-in-non-small-cell
#11
Jaime Stella Moses Richardson, Norhaniza Aminudin, Sri Nurestri Abd Malek
Background: Plants have been a major source of inspiration in developing novel drug compounds in the treatment of various diseases that afflict human beings worldwide. Ruta angustifolia L. Pers known locally as Garuda has been conventionally used for various medicinal purposes such as in the treatment of cancer. Objective: A dihydrofuranocoumarin named chalepin, which was isolated from the chloroform extract of the plant, was tested on its ability to inhibit molecular pathways of human lung carcinoma (A549) cells...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142388/analysis-of-free-amino-acids-in-different-extracts-of-orthosiphon-stamineus-leaves-by-high-performance-liquid-chromatography-combined-with-solid-phase-extraction
#12
Armaghan Shafaei, Nor Hidayah Ab Halim, Norhidayah Zakaria, Zhari Ismail
Background: Orthosiphon stamineus (OS) Benth is a medicinal plant and native in Southeast Asia. Previous studies have shown that OS leaves possess antioxidant, cytotoxic, diuretic, antihypertensive, and uricosuric effects. These beneficial effects have been attributed to the presence of primary and secondary metabolites such as polyphenols, amino acids, and flavonoids. Objective: To develop and validate an high-performance liquid chromatography (HPLC)-diode array detector (DAD) method combined with solid-phase extraction that involves precolumn derivatization with O-phthaladehyde for simultaneous analysis of free amino acids in OS leaves extracts...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142170/characterization-of-a-rat-model-of-moderate-liver-dysfunction-based-on-alpha-naphthylisothiocyanate-induced-cholestasis
#13
Melanie K Bothe, Christoph Meyer, Udo Mueller, Jean-Christophe Queudot, Virginie Roger, Johannes Harleman, Martin Westphal
Plasma amino acid level changes occur in mild, moderate and severe stages of liver injury in human patients. In animal models, however, data are mainly restricted to severe liver injury models in rats. Here we present the characterization of a rat model of moderate liver dysfunction secondary to alpha-napthylisothiocyanate (ANIT)-induced cholestasis. Rats treated with 30 mg/kg/day ANIT for 3 weeks exhibited a time-dependent increase in plasma alanine aminotransferase (ALT), aspartate aminotransferase (AST) and bilirubin levels and a decrease in albumin concentration...
2017: Journal of Toxicological Sciences
https://www.readbyqxmd.com/read/29141871/potential-approaches-to-prevent-hypoglycemia-associated-autonomic-failure
#14
REVIEW
Eric Lontchi-Yimagou, Jee Young You, Michelle Carey, Ilan Gabriely, Harry Shamoon, Meredith Hawkins
Clear health benefits are associated with intensive glucose control in type 1 diabetes mellitus (T1DM). However, maintaining near-normal glycemia remains an elusive goal for many patients, in large part owing to the risk of severe hypoglycemia. In fact, recurrent episodes of hypoglycemia lead to 'hypoglycemia-associated autonomic failure' (HAAF), characterized by defective counter-regulatory responses to hypoglycemia. Extensive studies to understand the mechanisms underlying HAAF have revealed multiple potential etiologies, suggesting various approaches to prevent the development of HAAF...
November 14, 2017: Journal of Investigative Medicine: the Official Publication of the American Federation for Clinical Research
https://www.readbyqxmd.com/read/29141471/dietary-chlorogenic-acid-regulates-gut-microbiota-serum-free-amino-acids-and-colonic-serotonin-levels-in-growing-pigs
#15
Yi Wu, Wenhui Liu, Qi Li, Yafei Li, Yali Yan, Fang Huang, Xin Wu, Quancheng Zhou, Xugang Shu, Zheng Ruan
Chlorogenic acid (CGA) has many biological properties, including antibacterial, antioxidant and anti-inflammatory properties, and is one of the most abundant phenolic acids available in the human diet. The aim of this study was to investigate the effects of CGA on regulation of the gut microbiota, and on the levels of free amino acids and 5-hydroxytryptamine (5-HT, serotonin). Ninety-six healthy growing pigs were randomly assigned to two treatment groups: the Ctrl group (control group, standard feed) and the CGA group [standard feed plus 0...
November 15, 2017: International Journal of Food Sciences and Nutrition
https://www.readbyqxmd.com/read/29141371/-effect-of-recombinant-human-growth-hormone-therapy-on-metabolic-parameters-in-patients-with-craniopharyngioma
#16
J F Mao, X Wang, S Y Xiong, J J Zheng, B Q Yu, M Nie, X Y Wu, S T Qi
Objective: To investigate the effects of recombinant human growth hormone (rhGH) on metabolic parameters in patients with craniopharyngioma surgeries. Methods: Totallys 30 patients with craniopharyngioma were included in this retrospective study. They were divided into growth hormone (GH) group and control group according to whether they received rhGH therapy or not. The following parameters, including body mass index (BMI), weight, waist circumstance, transaminase, fasting blood glucose, lipid profile and high-sensitivity C-reactive protein (hsCRP) were compared after rhGH therapy for 4-6 months...
November 14, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29140312/plasma-amino-acid-abnormalities-in-chronic-heart-failure-mechanisms-potential-risks-and-targets-in-human-myocardium-metabolism
#17
Roberto Aquilani, Maria Teresa La Rovere, Daniela Corbellini, Evasio Pasini, Manuela Verri, Annalisa Barbieri, Anna Maria Condino, Federica Boschi
The goal of this study was to measure arterial amino acid levels in patients with chronic heart failure (CHF), and relate them to left ventricular function and disease severity. Amino acids (AAs) play a crucial role for heart protein-energy metabolism. In heart failure, arterial AAs, which are the major determinant of AA uptake by the myocardium, are rarely measured. Forty-one subjects with clinically stable CHF (New York Heart Association (NYHA) class II to IV) were analyzed. After overnight fasting, blood samples from the radial artery were taken to measure AA concentrations...
November 15, 2017: Nutrients
https://www.readbyqxmd.com/read/29140261/proximate-composition-and-nutritional-value-of-three-macroalgae-ascophyllum-nodosum-fucus-vesiculosus-and-bifurcaria-bifurcata
#18
José M Lorenzo, Rubén Agregán, Paulo E S Munekata, Daniel Franco, Javier Carballo, Selin Şahin, Ramón Lacomba, Francisco J Barba
Proximate composition (moisture, protein, lipid and ash content) and nutritional value (fatty acid, amino acid and mineral profile) of three macroalgae (Ascophyllum nodosum, Fucus vesiculosus and Bifurcaria bifurcate) were studied. Chemical composition was significantly (p < 0.001) different among the three seaweeds. In this regard, the B. bifurcata presented the highest fat content (6.54% of dry matter); whereas, F. vesiculosus showed the highest protein level (12.99% dry matter). Regarding fatty acid content, the polyunsaturated fatty acids (PUFAs) were the most abundant followed by saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs)...
November 15, 2017: Marine Drugs
https://www.readbyqxmd.com/read/29138698/soluble-epoxide-hydrolase-inhibitor-and-14-15-epoxyeicosatrienoic-acid-facilitated-long-term-potentiation-through-camp-and-camkii-in-the-hippocampus
#19
Han-Fang Wu, Yi-Ju Chen, Su-Zhen Wu, Chi-Wei Lee, I-Tuan Chen, Yi-Chao Lee, Chi-Chen Huang, Chung-Hsi Hsing, Chih-Wei Tang, Hui-Ching Lin
Epoxyeicosatrienoic acids (EETs) are derived from arachidonic acid and metabolized by soluble epoxide hydrolase (sEH). The role of EETs in synaptic function in the central nervous system is still largely unknown. We found that pharmacological inhibition of sEH to stabilize endogenous EETs and exogenous 14,15-EET significantly increased the field excitatory postsynaptic potential (fEPSP) response in the CA1 area of the hippocampus, while additionally enhancing high-frequency stimulation- (HFS-) induced long-term potentiation (LTP) and forskolin- (FSK-) induced LTP...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/29138116/in-silico-identification-of-genes-involved-in-chronic-metabolic-acidosis
#20
Ishfaq A Sheikh, Adeel Malik, Sameera F M AlBasri, Mohd A Beg
AIMS: Chronic metabolic acidosis (CMA) refers to increased plasma acidity due to disturbed acid-base equilibrium in human body. CMA leads to many dysfunctions including disorders of intestinal metabolism and barrier functions. The human body responds to these intestinal dysfunctions by creating a compensatory mechanism at genomic level in intestinal epithelial cells. This study was to identify the molecular pathways involved in metabolic dysfunction and compensatory adaptations in intestinal epithelium during CMA...
November 11, 2017: Life Sciences
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