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Iron chelation

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https://www.readbyqxmd.com/read/27922079/proteomic-profiling-reveals-that-collismycin-a-is-an-iron-chelator
#1
Makoto Kawatani, Makoto Muroi, Akira Wada, Gyo Inoue, Yushi Futamura, Harumi Aono, Kenshirou Shimizu, Takeshi Shimizu, Yasuhiro Igarashi, Naoko Takahashi-Ando, Hiroyuki Osada
Collismycin A (CMA), a microbial product, has anti-proliferative activity against cancer cells, but the mechanism of its action remains unknown. Here, we report the identification of the molecular target of CMA by ChemProteoBase, a proteome-based approach for drug target identification. ChemProteoBase profiling showed that CMA is closely clustered with di-2-pyridylketone 4,4-dimethyl-3-thiosemicarbazone, an iron chelator. CMA bound to both Fe(II) and Fe(III) ions and formed a 2:1 chelator-iron complex with a redox-inactive center...
December 6, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27920823/antioxidant-effects-of-hydroalcoholic-and-polyphenolic-extracts-of-peucedanum-pastinacifolium-boiss-hausskn
#2
Ahmad Movahedian, Behzad Zolfaghari, Mehrzad Mirshekari
Antioxidant activity of Peucedanum pastinacifolium Boiss. & Hausskn aerial part hydroalcoholic extract (HAE) and polyphenolic extract (PPE) as well as their total phenolic and flavonoid contents were studied. Phenolic and flavonoid contents were respectively estimated as gallic acid and quercetin equivalents. The in vitro antioxidant activity of two extracts of P. pastinacifolium were evaluated by radical scavenging of 1,1-diphenyl-2-picryl hydrazyl radical (DPPH), chelating activity on ferrous ions, or ferric reducing antioxidant power (FRAP) assay...
October 2016: Research in Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27915123/in-vitro-assessment-of-deferoxamine-on-mesenchymal-stromal-cells-from-tumor-and-bone-marrow
#3
Guoping Wang, Guobo Shen, Tao Yin
Deferoxamine (DFO), an iron chelator, is commonly used to remove excess iron from the body. DFO has also been demonstrated to have anti-tumor effect. However, there is no available report on the effect of deferoxamine on mesenchymal stromal cells (MSCs). In this study, we first isolated tumor-associated MSCs (TAMSCs) from EG-7 tumors, which were positive for CD29, CD44, CD73, CD90 and CD105. Ex vivo cultured stem cells derived from tumor and bone marrow compartment were exposed to DFO. We demonstrated that DFO had growth-arresting and apoptosis-inducing effect on TAMSCs and bone marrow MSCs (BMMSCs)...
November 23, 2016: Environmental Toxicology and Pharmacology
https://www.readbyqxmd.com/read/27913518/treatment-options-for-patients-with-myelodysplastic-syndromes-after-hypomethylating-agent-failure
#4
Hetty E Carraway
The treatment of patients with myelodysplastic syndromes (MDSs) has hinged primarily on supportive care (ie, blood transfusions, colony stimulating agents, iron chelation, etc.) and the US Food and Drug Administration-approved agents, including 5-azacytidine, deoxyazacytidine, and lenalidomide. For patients no longer benefitting from these agents, there is a paucity of effective therapies. The challenges at this time include our limited understanding of the mechanisms of resistance to these therapies and the variables employed to select next best therapies for patients based on: (1) their performance status and medical comorbidities; (2) the molecular feature(s) of their MDS; (3) the prior treatments they have received; and (4) the long-term goal(s)/possibilities for their future treatment (ie, transplant vs no transplant)...
December 2, 2016: Hematology—the Education Program of the American Society of Hematology
https://www.readbyqxmd.com/read/27911488/hepatocellular-carcinoma-as-an-emerging-morbidity-in-the-thalassemia-syndromes-a-comprehensive-review
#5
REVIEW
Hassan M Moukhadder, Racha Halawi, Maria Domenica Cappellini, Ali T Taher
The incidence of hepatocellular carcinoma (HCC) in patients with thalassemia is on the rise. The 2 well recognized HCC risk factors in thalassemia are iron overload and chronic viral infection with hepatitis C. The carcinogenicity of iron is related to its induction of oxidative damage, which results in genotoxicity, and to immunologic dysregulation, which attenuates cancer immune surveillance. Chronic hepatitis B and C infections lead to necroinflammation, which can prompt progression to HCC, but an independent role of hepatitis B virus in hepatic carcinogenesis among patients with thalassemia has not been demonstrated...
December 1, 2016: Cancer
https://www.readbyqxmd.com/read/27906525/the-clinical-utility-of-qsm-disease-diagnosis-medical-management-and-surgical-planning
#6
REVIEW
Sarah Eskreis-Winkler, Yan Zhang, Jingwei Zhang, Zhe Liu, Alexey Dimov, Ajay Gupta, Yi Wang
Quantitative susceptibility mapping (QSM) is an MR technique that depicts and quantifies magnetic susceptibility sources. Mapping iron, the dominant susceptibility source in the brain, has many important clinical applications. Herein, we review QSM applications in the diagnosis, medical management, and surgical treatment of disease. To assist in early disease diagnosis, QSM can identify elevated iron levels in the motor cortex of amyotrophic lateral sclerosis patients, in the substantia nigra of Parkinson's disease (PD) patients, in the globus pallidus, putamen, and caudate of Huntington's disease patients, and in the basal ganglia of Wilson's disease patients...
December 1, 2016: NMR in Biomedicine
https://www.readbyqxmd.com/read/27905038/biological-activity-of-spirocyclic-hydroxamic-acids
#7
M E Neganova, D V Mishchenko, T P Serkova, I V Vystorop, E F Shevtsova
Iron-chelating activity of synthesized spirocyclic hydroxamic acids, their toxicity, and effects on mitochondrial function were studied using primary culture of cerebral cortical neurons from newborn rats. All tested compounds effectively chelated Fe(II) ions. Activity of spirocyclic hydroxamic acids more strictly depended on the structure their piperidine, but not imidazolidine fragment. All compounds were non-toxic for normal neuronal culture.
December 1, 2016: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/27904406/preparation-identification-and-antioxidant-properties-of-black-bone-silky-fowl-gallus-gallus-domesticus-brisson-iron-ii-oligopeptide-chelate
#8
Huanglei Pan, Shasha Song, Qiuyue Ma, Hui Wei, Difeng Ren, Jun Lu
Black-bone silky fowl iron(II)-oligopeptide chelate was synthesized from iron(II) solution and the black-bone silky fowl oligopeptide, which was extracted from the muscle protein of black-bone silky fowl (Gallus gallus domesticus Brisson). Orthogonal array analysis was used to determine the optimal conditions for the iron(II)-oligopeptide chelate preparation. Ultraviolet-visible (UV-Vis) spectroscopy, electron microscopy, and Fourier transform infrared (FTIR) spectroscopy were used to identify the structure of iron(II)-oligopeptide chelate...
June 2016: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/27902780/co-regulation-of-iron-metabolism-and-virulence-associated-functions-by-iron-and-xibr-a-novel-iron-binding-transcription-factor-in-the-plant-pathogen-xanthomonas
#9
Sheo Shankar Pandey, Pradeep Kumar Patnana, Santosh Kumar Lomada, Archana Tomar, Subhadeep Chatterjee
Abilities of bacterial pathogens to adapt to the iron limitation present in hosts is critical to their virulence. Bacterial pathogens have evolved diverse strategies to coordinately regulate iron metabolism and virulence associated functions to maintain iron homeostasis in response to changing iron availability in the environment. In many bacteria the ferric uptake regulator (Fur) functions as transcription factor that utilize ferrous form of iron as cofactor to regulate transcription of iron metabolism and many cellular functions...
November 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27901057/digital-gene-expression-profiling-analysis-of-duodenum-transcriptomes-in-sd-rats-administered-ferrous-sulfate-or-ferrous-glycine-chelate-by-gavage
#10
Zhao Zhuo, Shenglin Fang, Qiaoling Hu, Danping Huang, Jie Feng
The absorption of different iron sources is a trending research topic. Many studies have revealed that organic iron exhibits better bioavailability than inorganic iron, but the concrete underlying mechanism is still unclear. In the present study, we examined the differences in bioavailability of ferrous sulfate and ferrous glycinate in the intestines of SD rats using Illumina sequencing technology. Digital gene expression analysis resulted in the generation of almost 128 million clean reads, with expression data for 17,089 unigenes...
November 30, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27900772/hematopoietic-stem-cell-transplantation-for-people-with-%C3%A3-thalassaemia-major
#11
REVIEW
Vanitha A Jagannath, Zbys Fedorowicz, Amani Al Hajeri, Akshay Sharma
BACKGROUND: Thalassemia is an inherited autosomal recessive blood disorder, caused by mutations in globin genes or their regulatory regions. This results in a reduced rate of synthesis of one of the globin chains that make up haemoglobin. In ß-thalassaemia major there is an underproduction of ß-globin chains combined with excess of free α-globin chains. The excess free α-globin chains precipitate in red blood cells, leading to their destruction (haemolysis) and ineffective erythropoiesis...
November 30, 2016: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/27894072/-rusty-hearts-is-it-time-to-rethink-iron-chelation-therapies-in-post-myocardial-infarction-setting
#12
EDITORIAL
Rohan Dharmakumar
No abstract text is available yet for this article.
October 2016: Circulation. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27893170/safety-profiles-of-iron-chelators-in-young-patients-with-haemoglobinopathies
#13
REVIEW
Sebastian Botzenhardt, Niya Li, Esther W Chan, Chor Wing Sing, Ian C K Wong, Antje Neubert
BACKGROUND: This review describes the safety of deferoxamine (DFO), deferiprone (DFP), deferasirox (DFX), and combined therapy in young patients less than 25 years of age with haemoglobinopathies. METHOD: Searches in electronic literature databases were performed. Studies reporting adverse events associated with iron chelation therapy were included. Study and reporting quality was assessed using AHRQ Risk of Bias Assessment Tool and McMaster Quality Assessment Scale of Harms...
November 28, 2016: European Journal of Haematology
https://www.readbyqxmd.com/read/27890816/pathophysiology-of-hemophilic-arthropathy-and-potential-targets-for-therapy
#14
REVIEW
Astrid E Pulles, Simon C Mastbergen, Roger E G Schutgens, Floris P J G Lafeber, Lize F D van Vulpen
Hemophilia is a congenital clotting factor deficiency characterized by spontaneous and trauma-related bleeding. Spontaneous bleeding shows a predilection for joints, and repeated hemarthroses lead to a disabling condition called hemophilic arthropathy. Treatment of this condition consists of preventing joint bleeding on the one hand and orthopedic surgery as a last resort on the other. Up till now, there is no disease modifying therapy available to fill the gap between these extremes. This review provides an overview of the pathogenesis of hemophilic arthropathy in order to identify potential targets for therapy...
November 24, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27889440/non-heat-shock-responsive-roles-of-hsf1-in-candida-albicans-are-essential-under-iron-deprivation-and-drug-defense
#15
Remya Nair, Mohd Shariq, Sanjiveeni Dhamgaye, Chinmay K Mukhopadhyay, Shamim Shaikh, Rajendra Prasad
Recently, we have reported that the conditional mutant of the heat shock factor-1 (HSF1) in Candida albicans displays enhanced susceptibility not only towards a plant alkaloid, berberine, but also to diverse antifungal drugs. The present study attempts to identify additional phenotypes highlighting the non-heat shock responsive roles of HSF1 that could be correlated with the enhanced drug susceptibility. We uncover an intricate relationship between cellular iron and HSF1 mediated drug susceptibility of C. albicans...
November 24, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27886462/loss-of-ppr3-ppr4-ppr6-or-ppr10-perturbs-iron-homeostasis-and-leads-to-apoptotic-cell-death-in-schizosaccharomyces-pombe
#16
Yang Su, Yanmei Yang, Ying Huang
Pentatricopeptide repeat (PPR) proteins characterized by tandem arrays of a degenerate 35-amino-acid repeat belong to a large family of RNA-binding proteins that are involved in posttranscriptional control of organelle gene expression. PPR proteins are ubiquitous in eukaryotes, and particularly prevalent in higher plants. Schizosaccharomyces pombe has ten PPR proteins. Among them, ppr3, ppr4, ppr6 and ppr10 participate in mitochondrial posttranscriptional processes and are required for mitochondrial electron transport chain (ETC) function...
November 25, 2016: FEBS Journal
https://www.readbyqxmd.com/read/27885599/characterization-of-high-affinity-iron-acquisition-systems-in-campylobacter-jejuni
#17
Ximin Zeng, Jun Lin
Iron acquisition systems are critical for bacterial pathogenesis and thus have been proposed as attractive targets for iron-dependent pathogen control. Of these systems, high-affinity iron acquisition mediated by siderophore, a small iron chelator, is the most efficient iron-scavenging mechanism in gram-negative bacteria. Campylobacter does not produce any siderophores but has the ability to utilize exogenous siderophores. In particular, the enterobactin (Ent)-mediated iron scavenging is tightly linked to Campylobacter pathogenesis...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27881236/deferasirox-pharmacokinetics-evaluation-in-a-woman-with-hereditary-haemochromatosis-and-heterozygous-%C3%AE-thalassaemia
#18
Sarah Allegra, Silvia De Francia, Filomena Longo, Davide Massano, Jessica Cusato, Arianna Arduino, Elisa Pirro, Antonio Piga, Antonio D'Avolio
We present the deferasirox pharmacokinetics evaluation of a female patient on iron chelation, for the interesting findings from her genetic background (hereditary haemochromatosis and heterozygous β-thalassaemia) and clinical history (ileostomy; iron overload from transfusions). Drug plasma concentrations were measured by an HPLC-UV validated method, before and after ileum resection. Area under deferasirox concentration curve over 24h (AUC) values were determined by the mixed log-linear rule, using Kinetica software...
November 20, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27879229/the-incidence-of-ototoxicity-in-patients-using-iron-chelators
#19
Serhan Derin, Fatih Mehmet Azık, Yaşar Topal, Hatice Topal, Volkan Karakuş, Petek Uzay Çetinkaya, Murat Şahan, Tansel Erdem Azık, Can Naci Kocabaş
OBJECTIVE: In this study, we aimed to detect the incidences of ototoxicity in patients with hemoglobinopathies taking deferoxamine (DFO), deferiprone, and deferasirox using the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) scale to obtain more objective data. MATERIALS AND METHODS: Fifty-five transfusion-dependent patients were evaluated in this study. The NCI CTCAE scale was used to assess ototoxicity levels. The average ferritin and hemoglobin levels, the type of iron chelator, and the duration of therapy of all the patients were recorded...
November 23, 2016: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/27876630/disruptions-of-the-genes-involved-in-lysine-biosynthesis-iron-acquisition-and-secondary-metabolisms-affect-virulence-and-fitness-in-metarhizium-robertsii
#20
Bruno Giuliano Garisto Donzelli, B Gillian Turgeon, Donna M Gibson, Stuart B Krasnoff
Based on genomic analysis, polyketide synthase (PKS) and nonribosomal peptide synthetase (NRPS) pathways account for biosynthesis of the majority of the secondary metabolites produced by the entomopathogenic fungus Metarhizium robertsii. To evaluate the contribution of these pathways to M. robertsii fitness and/or virulence, mutants deleted for mrpptA, the Sfp-type 4' phosphopantetheinyl transferase gene required for their activation were generated. ΔmrpptA strains were deficient in PKS and NRPS activity resulting in colonies that lacked the typical green pigment and failed to produce the nonribosomal peptides (destruxins, serinocylins, and the siderophores ferricrocin and metachelins) as well as the hybrid polyketide-peptides (NG-39x) that are all produced by the wild type (WT) M...
November 19, 2016: Fungal Genetics and Biology: FG & B
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