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copper metabolism

Liu-Zhu Yu, Yin Wei, Min Shi
Copper-catalyzed cascade cyclization of 1,5-enynes with two types of hypervalent reagents was developed via consecutive trifluoromethylazidation/diazidation and intramolecular click reaction (CUAAC), providing one-pot self-assembly of triazole fused isoindolines bearing a trifluoromethyl or an azide moiety. Moreover, the construction of a trifluoromethylcyclopropyl unit, which has been considered as a metabolically stable replacement for a tert-butyl moiety and was difficult to access, was also achieved under trifluoromethylazidation conditions...
October 21, 2016: Chemical Communications: Chem Comm
Somayeh Atari-Hajipirloo, Neda Valizadeh, Mohammad-Hassan Khadem-Ansari, Yousef Rasmi, Fatemeh Kheradmand
BACKGROUND: The altered levels of some essential trace elements and antioxidant minerals have been observed in diabetic patients. OBJECTIVES: The aim of the present study was to compare the concentrations of essential trace elements, copper (Cu), zinc (Zn), and iron (Fe) in the serum of patients who have type 2 diabetes mellitus (T2DM) with those of their non-diabetic first-degree relatives (FDR) and control subjects. The association between glycated hemoglobin (HbA1c) and levels of metals was also evaluated...
April 2016: International Journal of Endocrinology and Metabolism
Carla M Zammit, Florian Weiland, Joël Brugger, Benjamin Wade, Lyron Juan Winderbaum, Dietrich H Nies, Gordon Southam, Peter Hoffmann, Frank Reith
The metal-resistant β-proteobacterium Cupriavidus metallidurans drives gold (Au) biomineralisation and the (trans)formation of Au nuggets largely via unknown biochemical processes, ultimately leading to the reductive precipitation of mobile, toxic Au(i/iii)-complexes. In this study proteomic responses of C. metallidurans CH34 to mobile, toxic Au(iii)-chloride are investigated. Cells were grown in the presence of 10 and 50 μM Au(iii)-chloride, 50 μM Cu(ii)-chloride and without additional metals. Differentially expressed proteins were detected by difference gel electrophoresis and identified by liquid chromatography coupled mass spectrometry...
October 19, 2016: Metallomics: Integrated Biometal Science
Y Cedeño, M López-Alonso, M Miranda
OBJECTIVES: Defects in copper metabolism have been described in several dog breeds, and recently, it has been suggested that changes in other essential trace elements could be involved in the pathogenesis of hepatic disease. This study measured hepatic copper accumulation and its interactions with other essential trace and toxic metals in dogs diagnosed with chronic hepatitis. METHODS: Liver samples of 20 chronic hepatitis and 20 healthy dogs were collected. Samples were acid digested, and essential metals (cobalt, copper, iron, manganese, molibdenum, selenium and zinc) and toxic metals (arsenic, cadmium, mercury and lead) were analysed by inductively-coupled plasma mass spectrometry...
October 16, 2016: Journal of Small Animal Practice
Qijiang Jin, Xin Hu, Xin Li, Bei Wang, Yanjie Wang, Hongwei Jiang, Neil Mattson, Yingchun Xu
Trehalose-6-phosphate synthase (TPS) plays a key role in plant carbohydrate metabolism and the perception of carbohydrate availability. In the present work, the publicly available Nelumbo nucifera (lotus) genome sequence database was analyzed which led to identification of nine lotus TPS genes (NnTPS). It was found that at least two introns are included in the coding sequences of NnTPS genes. When the motif compositions were analyzed we found that NnTPS generally shared the similar motifs, implying that they have similar functions...
2016: Frontiers in Plant Science
Soheila Asadi, Mohammad Nabi Moradi, Nejat Khyripour, Mohammad Taghi Goodarzi, Marzieh Mahmoodi
Diabetes is a common metabolic disorder characterized by elevated blood glucose level. Trace element homeostasis causes disturbances in diabetes due to hyperglycemia. Superoxide dismutase (SOD), an antioxidant enzyme, contains zinc and copper ions as its cofactors. Defects in SOD level and activity have been observed in diabetes. Resveratrol (RSV) has displayed hypoglycemic effects and is proven to improve oxidative stress. The aim of the present study was to examine the possible effects of RSV on blood glucose level, serum copper and zinc levels, SOD, and a number of other oxidative markers in type 2 diabetic rats...
October 15, 2016: Biological Trace Element Research
Andrew Duncan, Calum Yacoubian, Robert Beetham, Anthony Catchpole, David Bullock
BACKGROUND: US and European guidelines suggest the use of calculated non-caeruloplasmin bound copper (free copper index) for the diagnosis and management of Wilson's Disease. However, there is concern that the required analytical measurements of caeruloplasmin and copper may not be sufficiently robust at the concentrations usually found. METHODS: Aliquots of six plasma specimens were sent to laboratories participating in the UK National External Quality Assessment Scheme for copper and caeruloplasmin...
October 13, 2016: Annals of Clinical Biochemistry
(no author information available yet)
The Food and Drug Administration (FDA) is publishing an order denying a petition requesting exemption from the premarket notification requirements for method, metallic reduction, glucose (urinary, nonquantitative) devices that are in a reagent tablet format and are classified as class II devices as urinary glucose (nonquantitative) test system (hereinafter referred to as "copper reduction tablet test"). Urinary glucose (nonquantitative) measurements are used in the diagnosis and treatment of carbohydrate metabolism disorders including diabetes mellitus, hypoglycemia, and hyperglycemia...
October 4, 2016: Federal Register
(no author information available yet)
The Food and Drug Administration (FDA) is publishing an order denying a petition requesting exemption from the premarket notification requirements for "method, metallic reduction, glucose (urinary, nonquantitative)'' devices that are in a reagent tablet format and are classified as class II devices as urinary glucose (nonquantitative) test system (hereinafter referred to as copper reduction tablet test"). Urinary glucose (nonquantitative) measurements are used in the diagnosis and treatment of carbohydrate metabolism disorders including diabetes mellitus, hypoglycemia, and hyperglycemia...
October 4, 2016: Federal Register
Lisa Gasperini, Elisa Meneghetti, Giuseppe Legname, Federico Benetti
Essential elements as copper and iron modulate a wide range of physiological functions. Their metabolism is strictly regulated by cellular pathways, since dysregulation of metal homeostasis is responsible for many detrimental effects. Neurodegenerative disorders such as Alzheimer's disease, Parkinson's disease and prion diseases are characterized by alterations of metal ions. These neurodegenerative maladies involve proteins that bind metals and mediate their metabolism through not well-defined mechanisms. Prion protein, for instance, interacts with divalent cations via multiple metal-binding sites and it modulates several metal-dependent physiological functions, such as S-nitrosylation of NMDA receptors...
2016: Frontiers in Neuroscience
Y G Kim, S Y Kim, J H Kim, K K Lee, Y M Yun
BACKGROUND: Deletion of exon 2 of copper metabolism domain containing 1 (COMMD1) results in copper toxicosis in Bedlington terriers (CT-BT). OBJECTIVES: This study was conducted to identify the prevalence and clinical relevance of the COMMD1 mutation in Bedlington terriers in Korea. ANIMALS: A total of 105 purebred Bedlington terriers (50 males, 55 females) from the kennels and pet dog clubs in Korea were examined during the period 2008-2013...
October 11, 2016: Journal of Veterinary Internal Medicine
Jorin Hoogenboom, Nathalja Berghuis, Dario Cramer, Rene Geurts, Han Zuilhof, Tom Wennekes
BACKGROUND: Carbohydrates, also called glycans, play a crucial but not fully understood role in plant health and development. The non-template driven formation of glycans makes it impossible to image them in vivo with genetically encoded fluorescent tags and related molecular biology approaches. A solution to this problem is the use of tailor-made glycan analogs that are metabolically incorporated by the plant into its glycans. These metabolically incorporated probes can be visualized, but techniques documented so far use toxic copper-catalyzed labeling...
October 10, 2016: BMC Plant Biology
Wojciech Cypryk, Martina B Lorey, Anne Puustinen, Tuula A Nyman, Sampsa Matikainen
Influenza A viruses (IAVs) are aggressive pathogens that cause acute respiratory diseases and annual epidemics in humans. Host defense against IAV infection is initiated by macrophages, which are the principal effector cells of the innate immune system. We have previously shown that IAV infection of human macrophages is associated with robust secretion of proteins via conventional and unconventional protein release pathways. Here we have characterized unconventional, extracellular vesicle (EV)-mediated protein secretion in human macrophages during IAV infection using proteomics, bioinformatics and functional studies...
October 11, 2016: Journal of Proteome Research
Bastien Dalzon, Hélène Diemer, Véronique Collin-Faure, Sarah Cianférani, Thierry Rabilloud, Catherine Aude-Garcia
The physiology of cells cultured in vitro depends obviously on the external conditions, including the nutrients present in the culture medium. In order to test the influence of this parameter, J774 macrophages grown either in RPMI or in DMEM were compared by a combination of targeted analyses and a proteomic approach. The two media differ in their glucose, amino acids and vitamins concentrations, but there was no significant differences in the cell cycle nor in the percentage of phagocytic cells in both media, although the phagocytic capacity (i...
October 9, 2016: Proteomics
Peng Wang, Jiang Wu, Pingru Su, Cong Xu, Yushu Ge, Dan Liu, Weisheng Liu, Yu Tang
Copper ions are known to be very important for homeostasis, which is critical for the metabolism and development of living organisms. In addition, sulfide ions, as an important endogenously produced gasotransmitter, have been proved to be implicated in a variety of physiological functions such as anti-apoptosis, vasodilation, antioxidation, and anti-inflammation. Herein, we report the development of a novel fluorescence chemosensor (L) based on a tetra-peptide conjugated with dansyl groups as a promising analytical tool for detecting Cu(2+) and S(2-) in 100% aqueous solutions, which exhibits excellent cell biotoxicity and intracellular biosensing ability...
October 18, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
Rafael Barros de Souza, Rayssa Karla Silva, Dayvison Soares Ferreira, Sérgio de Sá Leitão Paiva Junior, Will de Barros Pita, Marcos Antonio de Morais Junior
In a recent work we showed that magnesium (Mg(II)) plays an important role in industrial ethanol production, overcoming the negative effect of the excess of minerals, particularly copper, present in sugarcane juice, with a consequent increase in ethanol yield. This cation has been reported to be involved in several steps of yeast metabolism, acting mainly as a co-factor of several enzymes of fermentation metabolism and protecting yeast cells from stressful conditions. However, despite many physiological investigations, its effect in the molecular mechanisms that control such metabolic activities remains unclear and to date no information concerning its influence on gene expression has been provided...
October 7, 2016: Metallomics: Integrated Biometal Science
Patricia Erebi Tawari, Zhipeng Wang, Mohammad Najlah, Chi Wai Tsang, Vinodh Kannappan, Peng Liu, Christopher McConville, Bin He, Angel L Armesilla, Weiguang Wang
The anticancer activity of disulfiram (DS) is copper(ii) (Cu)-dependent. This study investigated the anticancer mechanisms of DS/Cu using in vitro cytotoxicity and metabolic kinetic analysis. Our study indicates that DS/Cu targets cancer cells by the combination of two types of actions: (1) instant killing executed by DS/Cu reaction generated reactive oxygen species; (2) delayed cytotoxicity introduced by the end product, DDC-Cu. Nanoencapsulation of DS might shed light on repositioning of DS into cancer treatment...
November 19, 2015: Toxicology Research
Nurul Afifah Mohd Salleh, Sabariah Ismail, Mohd Rohaimi Ab Halim
BACKGROUND: Curcuma xanthorrhiza is a native Indonesian plant and traditionally utilized for a range of illness including liver damage, hypertension, diabetes, and cancer. OBJECTIVE: The study determined the effects of C. xanthorrhiza extracts (ethanol and aqueous) and their constituents (curcumene and xanthorrhizol) on UDP-glucuronosyltransferase (UGT) and glutathione transferase (GST) activities. MATERIALS AND METHODS: The inhibition studies were evaluated both in rat liver microsomes and in human recombinant UGT1A1 and UGT2B7 enzymes...
October 2016: Pharmacognosy Research
Bhupender Kumar Bajaj, Ankur Wadhwa, Richa Singh, Saurabh Gupta
Wilson's disease is a multisystem disorder which manifests with hepatic, neurological, musculoskeletal, hematological, renal, and cardiac symptoms. The hepatic and neurological manifestations often overshadow the other system involvement including cardiac symptoms and signs, which may prove fatal. We report a case of a young female who presented with progressive parkinsonian features and dystonia for around 4 months followed 2 months later by the complaint of episodes of light-headedness. She was diagnosed to have Wilson's disease based on the presence of Kayser-Fleischer ring and laboratory parameters of copper metabolism...
October 2016: Journal of Neurosciences in Rural Practice
Aurélia Poujois, Jean-Christophe Devedjian, Caroline Moreau, David Devos, Pascal Chaine, France Woimant, James A Duce
Medical treatment in Wilson's disease includes chelators (D-penicillamine and trientine) or zinc salts that have to be maintain all the lifelong. This pharmacological treatment is categorised into two phases; the first being a de-coppering phase and the second a maintenance one. The best therapeutic approach remains controversial, as only a few non-controlled trials have compared these treatments. During the initial phase, progressive increase of chelators' doses adjusted to exchangeable copper and urinary copper might help to avoid neurological deterioration...
October 2016: Current Treatment Options in Neurology
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