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Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine

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https://www.readbyqxmd.com/read/28523598/study-on-the-interaction-of-chromate-with-bovine-serum-albumin-by-spectroscopic-method
#1
Hongguang Cao, Yanli Yi
The interaction between two chromates [sodium chromate (Na2CrO4) and potassium chromate K2CrO4)] and bovine serum albumin (BSA) in physiological buffer (pH 7.4) was investigated by the fluorescence quenching technique. The results of fluorescence titration revealed that two chromates could strongly quench the intrinsic fluorescence of BSA through a static quenching procedure. The apparent binding constants K and number of binding sites n of chromate with BSA were obtained by the fluorescence quenching method...
May 18, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28516305/arsenic-toxicity-and-epimutagenecity-the-new-lineage
#2
REVIEW
Somnath Paul, Pritha Bhattacharjee, Ashok K Giri, Pritha Bhattacharjee
Global methylation pattern regulates the normal functioning of a cell. Research have shown arsenic alter these methylation landscapes within the genome leading to aberrant gene expression and inducts various pathophysiological outcomes. Long interspersed nuclear elements (LINE-1) normally remains inert due to heavy methylation of it's promoters, time and various environmental insults, they lose these methylation signatures and begin retro-transposition that has been associated with genomic instability and cancerous outcomes...
May 17, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28512703/metal-homeostasis-in-bacteria-the-role-of-arsr-smtb-family-of-transcriptional-repressors-in-combating-varying-metal-concentrations-in-the-environment
#3
REVIEW
Rudra P Saha, Saikat Samanta, Surajit Patra, Diganta Sarkar, Abinit Saha, Manoj Kumar Singh
Bacterial infections cause severe medical problems worldwide, resulting in considerable death and loss of capital. With the ever-increasing rise of antibiotic-resistant bacteria and the lack of development of new antibiotics, research on metal-based antimicrobial therapy has now gained pace. Metal ions are essential for survival, but can be highly toxic to organisms if their concentrations are not strictly controlled. Through evolution, bacteria have acquired complex metal-management systems that allow them to acquire metals that they need for survival in different challenging environments while evading metal toxicity...
May 16, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28283781/gold-compounds-as-cysteine-protease-inhibitors-perspectives-for-pharmaceutical-application-as-antiparasitic-agents
#4
Lara Massai, Luigi Messori, Nicola Micale, Tanja Schirmeister, Louis Maes, Dolores Fregona, Maria Agostina Cinellu, Chiara Gabbiani
Gold compounds form a new class of promising metal-based drugs with a number of potential therapeutic applications, particularly in the fields of anticancer and antimicrobial treatments. Previous research revealed that a group of structurally diverse gold compounds cause conspicuous inhibition of the protease activities of the human proteasome. Given the pharmacological importance of protease inhibition, the present study further explored whether these gold compounds might inhibit a few other proteases that are accepted druggable targets for disease treatment...
March 10, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28477296/analysis-of-complexes-of-metabolites-with-europium-tetracycline-using-capillary-electrophoresis-coupled-with-laser-induced-luminescence-detection
#5
Douglas B Craig, Zachery Hiebert
Glycolysis and Krebs cycle intermediates were incubated with Eu(3+)-tetracycline and separated using capillary electrophoresis utilizing post-column laser-induced luminescence detection in a sheath flow cuvette. 3-phopshoglycerate, phosphoenolpyruvate, adenosine diphosphate, phosphate, citrate and oxaloacetate were detected at a concentration of 100 μM or lower. When all these detected metabolites were contained within the same sample it was found that they interfered with one another. Of all the metabolites, oxaloacetate showed the highest detectability...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28425040/schiff-base-complexes-of-copper-and-zinc-as-potential-anti-colitic-compounds
#6
Elaine M Conner, John Reglinski, W Ewen Smith, I Jack Zeitlin
The design, synthesis and activity of polymodal compounds for the treatment of inflammatory bowel disease are reported. The compounds, being based on a metal-Schiff base motif, are designed to degrade during intestinal transit to release the bioactive components in the gut. The compounds have been developed sequential with the biomodal compounds combining copper or zinc with a salicylaldehyde adduct. These compounds were tested in a formalin induced colonic inflammation model in BK:A mice. From these studies a trimodal compound based on a zinc Schiff base analogue of sulfasalazine was designed...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28417221/co-localization-of-zinc-transporter-3-znt3-with-sensory-neuromediators-and-or-neuromodulators-in-the-enteric-nervous-system-of-the-porcine-esophagus
#7
Joanna Wojtkiewicz, Liliana Rytel, Krystyna Makowska, Sławomir Gonkowski
Zinc transporter 3 (ZnT3) is one of the zinc transporters family. It is closely connected to the nervous system, where enables the transport of zinc ions from the cytoplasm to synaptic vesicles. This substance has been described within the central and peripheral nervous system, especially in the enteric nervous system (ENS). The aim of the present study was to describe the co-localization of ZnT3 with selected neuromediators and/or neuromodulators participating in sensory stimuli conduction in neurons of the ENS within the porcine esophagus...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28409296/silver-i-complexes-with-chromone-derived-hydrazones-investigation-on-the-antimicrobial-and-cytotoxic-effects
#8
Lenka V Tamayo, Ane F Santos, Isabella P Ferreira, Verlane G Santos, Miriam T P Lopes, Heloisa Beraldo
Complexes [Ag(HCrPh)2]NO3·2H2O (1) and [Ag(HCrpClPh)2]NO3 (2) were obtained with 3-formyl-6-methylchromone-phenyl hydrazone (HCrPh, HL1) and 3-formyl-6-methylchromone-para-chloro-phenyl hydrazone (HCrpClPh, HL2). Although the hydrazones were inactive, upon coordination to silver(I) antifungal activity significantly improved against several Candida strains. Complexes (1-2) revealed to be more active than silver nitrate, silver sulfadiazine and the reference drug nystatin against Candida parapsilosis. The cytotoxic activities of the hydrazones and their silver(I) complexes were evaluated in comparison with cisplatin on B16F10 (metastatic melanoma) and Melan-a (non-tumorigenic melanocyte) cells...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28409295/metal-chelator-tpen-selectively-induces-apoptosis-in-k562-cells-through-reactive-oxygen-species-signaling-mechanism-implications-for-chronic-myeloid-leukemia
#9
Luisa Rojas-Valencia, Carlos Velez-Pardo, Marlene Jimenez-Del-Rio
Chronic myeloid leukemia (CML) is a hematologic disorder characterized by the constitutive expression of BCR-ABL tyrosine kinase. Although successful implementation of tyrosine kinase inhibitors for the treatment of CML remain a traditional choice for molecularly targeted therapy, some patients present primary or secondary resistance to such therapy. Therefore, alternative therapeutic strategies are required to treat resistant CML cells. Accordingly, new anti-proliferative and/or pro-apoptotic compounds would be needed for clinical treatment...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28405829/an-optical-material-for-the-detection-of-trace-s2o3-2-in-milk-based-on-a-copper-complex
#10
Qingming Wang, Huifang Sun, Weilin Sha, Juan Chen, Liuyue Gu, Dong Wang, Xinhui Tang
A novel S2O3(2-) luminescent sensor (Cu(2+)-p-CPIP) was developed and the presence of S2O3(2-) caused an obvious fluorescence enhancement at 420 nm upon excitation at 330 nm, which could be distinguished with the naked eye under a UV lamp. Remarkably, the compound exhibited excellent selective and sensitive response to S2O3(2-) over other common anions with a micromolar limit of detection (0.442 μM) in DMSO/H2O (v/v, 1:1) buffer. The absorbance intensity and the color of Cu(2+)-p -CPIP solution changed gradually with the increase of S2O3(2-) concentration...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28343289/the-effect-of-mucin-fibrinogen-and-igg-on-the-corrosion-behaviour-of-ni-ti-alloy-and-stainless-steel
#11
Zhang Chao, Xiao Yaomu, Liu Chufeng, Liu Conghua
In this study, Ni-Ti alloy and stainless steal were exposed to artificial saliva containing fibrinogen, IgG or mucin, and the resultant corrosion behavior was studied. The purpose was to determine the mechanisms by which different types of protein contribute to corrosion. The effect of different proteins on the electrochemical resistance of Ni-Ti and SS was tested by potentiodynamic polarization, and the repair capacity of passivation film was tested by cyclic polarization measurements. The dissolved corrosion products were determined by ICP-OES, and the surface was analyzed by SEM and AFM...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28337565/blood-trace-metals-in-a-sporadic-amyotrophic-lateral-sclerosis-geographical-cluster
#12
Stefano De Benedetti, Giorgio Lucchini, Cristian Del Bò, Valeria Deon, Alessandro Marocchi, Silvana Penco, Christian Lunetta, Elisabetta Gianazza, Francesco Bonomi, Stefania Iametti
Amyotrophic lateral sclerosis (ALS) is a fatal disorder with unknown etiology, in which genetic and environmental factors interplay to determine the onset and the course of the disease. Exposure to toxic metals has been proposed to be involved in the etiology of the disease either through a direct damage or by promoting oxidative stress. In this study we evaluated the concentration of a panel of metals in serum and whole blood of a small group of sporadic patients, all living in a defined geographical area, for which acid mine drainage has been reported...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28303361/human-topoisomerase-inhibition-and-dna-bsa-binding-of-ru-ii-scar-complexes-as-potential-anticancer-candidates-for-oral-application
#13
Rone A De Grandis, Mariana S de Camargo, Monize M da Silva, Érica O Lopes, Elias C Padilha, Flávia A Resende, Rosângela G Peccinini, Fernando R Pavan, Alessandro Desideri, Alzir A Batista, Eliana A Varanda
Three ruthenium(II) phosphine/diimine/picolinate complexes were selected aimed at investigating anticancer activity against several cancer cell lines and the capacity of inhibiting the supercoiled DNA relaxation mediated by human topoisomerase IB (Top 1). The structure-lipophilicity relationship in membrane permeability using the Caco-2 cells have also been evaluated in this study. SCAR 5 was found to present 45 times more cytotoxicity against breast cancer cell when compared to cisplatin. SCAR 4 and 5 were both found to be capable of inhibiting the supercoiled DNA relaxation mediated by Top 1...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28303360/modulation-of-linoleic-acid-binding-properties-of-human-serum-albumin-by-divalent-metal-cations
#14
Ekaterina L Nemashkalova, Eugene A Permyakov, Sergei E Permyakov, Ekaterina A Litus
Human serum albumin (HSA) is an abundant multiligand carrier protein, linked to progression of Alzheimer's disease (AD). Blood HSA serves as a depot of amyloid β (Aβ) peptide. Aβ peptide-buffering properties of HSA depend on interaction with its ligands. Some of the ligands, namely, linoleic acid (LA), zinc and copper ions are involved into AD progression. To clarify the interplay between LA and metal ion binding to HSA, the dependence of LA binding to HSA on Zn(2+), Cu(2+), Mg(2+) and Ca(2+) levels and structural consequences of these interactions have been explored...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28293755/zinc-inhibition-of-pyruvate-kinase-of-m-type-isozyme
#15
Keiko Murakami, Masataka Yoshino
Inhibitory effect of Zn on the pyruvate kinase of M (muscle)-type isozyme was analyzed for the purpose of elucidating the cytotoxicity of Zn. Zn inhibited pyruvate kinase uncompetitively with respect to the substrate PEP, and competitively with respect to ADP. Quotient velocity plot calculated from the Zn-inhibition curves showed that Zn(2+) as a ZnADP complex acted as competitive and uncompetitive inhibitors of the enzyme with respect to the substrate ADP and PEP, respectively: Zn(2+) forms a ZnADP complex, which may bind to the ADP-binding site of the free enzyme with the Ki value of 1...
June 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28281098/effect-of-metal-chelators-on-the-aggregation-of-beta-amyloid-peptides-in-the-presence-of-copper-and-iron
#16
Foozhan Tahmasebinia, Saeed Emadi
Amyloid β (Aβ) fibrils and amorphous aggregates are found in the brain of patients with Alzheimer's disease (AD), and are implicated in the etiology of AD. The metal imbalance is also among leading causes of AD, owing to the fact that Aβ aggregation takes place in the synaptic cleft where Aβ, Cu(II) and Fe(III) are found in abnormally high concentrations. Aβ40 and Aβ42 are the main components of plaques found in afflicted brains. Coordination of Cu(II) and Fe(III) ions to Aβ peptides have been linked to Aβ aggregation and production of reactive oxygen species, two key events in the development of AD pathology...
April 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28258507/neutron-activation-increases-activity-of-ruthenium-based-complexes-and-induces-cell-death-in-glioma-cells-independent-of-p53-tumor-suppressor-gene
#17
Aline Monezi Montel, Raquel Gouvêa Dos Santos, Pryscila Rodrigues da Costa, Elisângela de Paula Silveira-Lacerda, Alzir Azevedo Batista, Wagner Gouvêa Dos Santos
Novel metal complexes have received great attention in the last decades due to their potential anticancer activity. Notably, ruthenium-based complexes have emerged as good alternative to the currently used platinum-based drugs for cancer therapy, providing less toxicity and side effects to patients. Glioblastoma is an aggressive and invasive type of brain tumor and despite of advances is the field of neurooncology there is no effective treatment until now. Therefore, we sought to investigate the potential antiproliferative activity of phosphine-ruthenium-based complexes on human glioblastoma cell lines...
April 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28220332/increased-mercury-emissions-from-modern-dental-amalgams
#18
Ulf G Bengtsson, Lars D Hylander
All types of dental amalgams contain mercury, which partly is emitted as mercury vapor. All types of dental amalgams corrode after being placed in the oral cavity. Modern high copper amalgams exhibit two new traits of increased instability. Firstly, when subjected to wear/polishing, droplets rich in mercury are formed on the surface, showing that mercury is not being strongly bonded to the base or alloy metals. Secondly, high copper amalgams emit substantially larger amounts of mercury vapor than the low copper amalgams used before the 1970s...
April 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28210928/bacterial-resistance-to-arsenic-protects-against-protist-killing
#19
Xiuli Hao, Xuanji Li, Chandan Pal, Jon Hobman, D G Joakim Larsson, Quaiser Saquib, Hend A Alwathnani, Barry P Rosen, Yong-Guan Zhu, Christopher Rensing
Protists kill their bacterial prey using toxic metals such as copper. Here we hypothesize that the metalloid arsenic has a similar role. To test this hypothesis, we examined intracellular survival of Escherichia coli (E. coli) in the amoeba Dictyostelium discoideum (D. discoideum). Deletion of the E. coli ars operon led to significantly lower intracellular survival compared to wild type E. coli. This suggests that protists use arsenic to poison bacterial cells in the phagosome, similar to their use of copper...
April 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28204978/characterization-and-cytotoxic-effect-of-aqua-2-2-2-nitrilotriacetato-oxo-vanadium-salts-on-human-osteosarcoma-cells
#20
Aleksandra Tesmar, Dariusz Wyrzykowski, Rafał Kruszyński, Karolina Niska, Iwona Inkielewicz-Stępniak, Joanna Drzeżdżon, Dagmara Jacewicz, Lech Chmurzyński
The use of protonated N-heterocyclic compound, i.e. 2,2'-bipyridinium cation, [bpyH(+)], enabled to obtain the new nitrilotriacetate oxidovanadium(IV) salt of the stoichiometry [bpyH][VO(nta)(H2O)]H2O. The X-ray measurements have revealed that the compound comprises the discrete mononuclear [VO(nta)(H2O)](-) coordination ion that can be rarely found among other known compounds containing nitrilotriacetate oxidovanadium(IV) moieties. The antitumor activity of [bpyH][VO(nta)(H2O)]H2O and its phenanthroline analogue, [phenH][VO(nta)(H2O)](H2O)0...
April 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
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