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Iron chelation

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https://www.readbyqxmd.com/read/28815805/intracellular-iron-overload-leading-to-dna-damage-of-lymphocytes-and-immune-dysfunction-in-thalassemia-major-patients
#1
Jyoti Shaw, Ayan Chakraborty, Arijit Nag, Arnab Chattopadyay, Anjan Kr Dasgupta, Maitreyee Bhattacharyya
OBJECTIVES: To investigate the cause and effects of intracellular iron overload in lymphocytes of thalassemia major patients. METHODS: 66 thalassemia major patients having iron overload and 10 age matched controls were chosen for the study. Blood sample was collected and serum ferritin, oxidative stress, lymphocyte DNA damage were examined as well as infective episodes were also counted. RESULTS: Case-control analysis revealed significant oxidative stress, iron overload, DNA damage and rate of infections in thalassemia cases as compared to controls...
August 16, 2017: European Journal of Haematology
https://www.readbyqxmd.com/read/28811866/preliminary-data-on-the-interaction-between-some-biometals-and-oxidative-stress-status-in-mild-cognitive-impairment-and-alzheimer-s-disease-patients
#2
Ioana-Miruna Balmuș, Stefan-Adrian Strungaru, Alin Ciobica, Mircea-Nicusor Nicoara, Romeo Dobrin, Gabriel Plavan, Cristinel Ștefănescu
Increased interest regarding the biometal mechanisms of action and the pathways in which they have regulatory roles was lately observed. Particularly, it was shown that biometal homeostasis dysregulation may lead to neurodegeneration including Alzheimer's disease, Parkinson disease, or prion protein disease, since important molecular signaling mechanisms in brain functions implicate both oxidative stress and redox active biometals. Oxidative stress could be a result of a breakdown in metal-ion homeostasis which leads to abnormal metal protein chelation...
2017: Oxidative Medicine and Cellular Longevity
https://www.readbyqxmd.com/read/28809446/deferasirox-for-managing-iron-overload-in-people-with-thalassaemia
#3
REVIEW
Claudia Bollig, Lisa K Schell, Gerta Rücker, Roman Allert, Edith Motschall, Charlotte M Niemeyer, Dirk Bassler, Joerg J Meerpohl
BACKGROUND: Thalassaemia is a hereditary anaemia due to ineffective erythropoiesis. In particular, people with thalassaemia major develop secondary iron overload resulting from regular red blood cell transfusions. Iron chelation therapy is needed to prevent long-term complications.Both deferoxamine and deferiprone are effective; however, a review of the effectiveness and safety of the newer oral chelator deferasirox in people with thalassaemia is needed. OBJECTIVES: To assess the effectiveness and safety of oral deferasirox in people with thalassaemia and iron overload...
August 15, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28807236/overcoming-barriers-to-treating-iron-overload-in-patients-with-lower-risk-myelodysplastic-syndrome
#4
REVIEW
Amer M Zeidan, Vinod A Pullarkat, Rami S Komrokji
Myelodysplastic syndromes (MDS) constitute a group of heterogeneous hematopoietic neoplasms characterized by ineffective erythropoiesis, anemia, and/or cytopenias. Supportive care for patients with MDS involves frequent red blood cell transfusions, which places patients with ongoing transfusional dependence (TD) at risk for iron overload (IO). Development of IO and tissue iron deposition can increase the risk of cardiac, hepatic, and endocrine toxicities, infection, and progression to acute myeloid leukemia...
September 2017: Critical Reviews in Oncology/hematology
https://www.readbyqxmd.com/read/28806856/direct-cell-labeling-to-image-transplanted-stem-cells-in-real-time-using-a-dual-contrast-mri-technique
#5
Ethel J Ngen, Yoshinori Kato, Dmitri Artemov
Exogenous direct cell labeling with superparamagnetic iron oxide nanoparticles (SPIONs) is currently the most employed cell-labeling technique for tracking transplanted cells using magnetic resonance imaging (MRI). Although SPION-based cell labeling is effective for monitoring cell delivery and migration, monitoring cell survival is still a challenge. This unit describes an MRI technique that permits detection of the delivery, migration, and death of transplanted cells. This dual-contrast technique involves labeling cells with two different classes of MRI contrast agents, possessing different diffusion coefficients: SPIONs (T2 /T2(*) contrast agents, with lower diffusion coefficients) and gadolinium chelates (T1 contrast agents, with higher diffusion coefficients)...
August 14, 2017: Current Protocols in Stem Cell Biology
https://www.readbyqxmd.com/read/28806577/prevalence-and-predictors-of-cardiac-and-liver-iron-overload-in-patients-with-thalassemia-a-multicenter-study-based-on-real-world-data
#6
Rungroj Krittayaphong, Vip Viprakasit, Pairash Saiviroonporn, Noppadol Siritanaratkul, Suvipaporn Siripornpitak, Arunotai Meekaewkunchorn, Thawatchai Kirawittaya, Pornpun Sripornsawan, Arunee Jetsrisuparb, Jiraporn Srinakarin, Peerapon Wong, Nuttaporntira Phalakornkul, Phakatip Sinlapamongkolkul, John Wood
Prevalence of cardiac and liver iron overload in patients with thalassemia in real-world practice may vary among different regions especially in the era of widely-used iron chelation therapy. The aim of this study was to determine the prevalence of cardiac and liver iron overload in and the management patterns of patients with thalassemia in real-world practice in Thailand. We established a multicenter registry for patients with thalassemia who underwent magnetic resonance imaging (MRI) as part of their clinical evaluation...
August 5, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28801997/prevalence-of-low-bone-mass-among-adolescents-with-nontransfusion-dependent-hemoglobin-e-%C3%AE-thalassemia-and-its-relationship-with-anemia-severity
#7
Pairunyar Nakavachara, Jaturat Petchkul, Krittha Jeerawongpanich, Pornpimol Kiattisakthavee, Teerarat Manpayak, Parichat Netsakulnee, Katharee Chaichanwattanakul, Julaporn Pooliam, Somdet Srichairatanakool, Vip Viprakasit
BACKGROUND: Low bone mass is common among adolescents with transfusion-dependent β-thalassemia despite adequate transfusion and iron chelation. However, there are few reports regarding bone mineral density (BMD) among adolescents with nontransfusion-dependent thalassemia (NTDT). Indeed, only BMD data in patients with nontransfusion-dependent (NTD) β-thalassemia intermedia have been reported. No previous study has investigated BMD among adolescents with NTD hemoglobin (Hb) E/β-thalassemia...
August 12, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/28801864/isolation-and-characterization-of-iron-chelators-from-turmeric-curcuma-longa-selective-metal-binding-by-curcuminoids
#8
Donald J Messner, Christine Surrago, Celia Fiordalisi, Wing Yin Chung, Kris V Kowdley
Iron overload disorders may be treated by chelation therapy. This study describes a novel method for isolating iron chelators from complex mixtures including plant extracts. We demonstrate the one-step isolation of curcuminoids from turmeric, the medicinal food spice derived from Curcuma longa. The method uses iron-nitrilotriacetic acid (NTA)-agarose, to which curcumin binds rapidly, specifically, and reversibly. Curcumin, demethoxycurcumin, and bisdemethoxycurcumin each bound iron-NTA-agarose with comparable affinities and a stoichiometry near 1...
August 11, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28801773/growth-performance-mineral-digestibility-and-blood-characteristics-of-ostriches-receiving-drinking-water-supplemented-with-varying-levels-of-chelated-trace-mineral-complex
#9
Hossein Seyfori, Hossein Ali Ghasemi, Iman Hajkhodadadi, Mohammad Hassan Nazaran, Maryam Hafizi
The effects of water supplementation of chelated trace minerals (CTM, which is named Bonzaplex designed with chelate compounds technology) on growth performance, apparent total tract digestibility (ATTD) of minerals, and some blood metabolites, TM, and antioxidant enzyme values in African ostriches were investigated from 8 to 12 months of age. A total of 20 8-month-old ostriches (five birds in five replicate pens) was randomly allocated into one of the following four treatments: (1) control (basal diet + tap water), (2) low CTM (basal diet +100 mg/bird/day CTM powder in tap water), (3) medium CTM (basal diet +1 g/bird/day CTM powder in tap water), and (4) high CTM (basal diet +2 g/bird/day CTM powder in tap water)...
August 11, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28795681/-research-progress-of-iron-metabolism-in-critical-ill-patients
#10
Ling Xie, Shengnan Wang, Suyue Pan
Iron is an essential nutrient element for human, but has potential toxicity. Under physiological conditions, the processes of iron absorption, transportation, cellular uptake and utilization, storage, release, excretion as well as regulation of iron metabolism maintain the iron homeostasis. However under pathological conditions, the iron metabolism changes and is associated with the pathological states. In order to realize the relationship between the critical illness status and the iron metabolism, we start with an analysis of the basic processes of iron metabolism in human and the toxicity of iron, followed by summary on the alteration of iron metabolism in the settings of pathological conditions, such as inflammation, infection and anemia, which often occur in critical illness...
August 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
https://www.readbyqxmd.com/read/28794066/insights-into-cellular-and-molecular-basis-for-urinary-tract-infection-in-autosomal-dominant-polycystic-kidney-disease
#11
Chao Gao, Long Zhang, Ye Zhang, Darren Paul Wallace, Reynold I Lopez-Soler, Paul J Higgins, Wenzheng Zhang
Urinary tract infection (UTI) is a broad term referring to an infection of the kidneys, ureters, bladder and/or urethra. Due to its prevalence, frequent recurrence and rising resistance to antibiotics, UTI has become a challenge in clinical practice. Autosomal dominant polycystic kidney disease (ADPKD) is the most common monogenic disorder of the kidney and is characterized by the growth of fluid-filled cysts in both kidneys. Progressive cystic enlargement, inflammation and interstitial fibrosis result in nephron loss with subsequent decline in kidney function...
August 9, 2017: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/28792609/egcg-attenuates-fe-iii-induced-conformational-transition-of-%C3%AE-synuclein-and-protects-as-pc12-cells-against-fe-iii-induced-death
#12
Juan Zhao, Lihui Xu, Qingnan Liang, Qing Sun, Congheng Chen, Yuan Zhang, Yu Ding, Ping Zhou
The fibrillation and aggregation of α-synuclein (AS), along with the conformational transition from random coil to β-sheet, are the critical steps in the development of Parkinson's disease (PD). It is acknowledged that iron accumulation in the brain may lead to the fibrillation of AS. However, (-)-epigallocatechin gallate (EGCG) can penetrate the blood-brain barrier, chelate metal ions and inhibit the fibrillation of amyloid proteins. Therefore, EGCG is warranted to be investigated for its potential to cure amyloid-related diseases...
August 9, 2017: Journal of Neurochemistry
https://www.readbyqxmd.com/read/28791836/in-vivo-effects-of-curcumin-and-deferoxamine-in-experimental-endometriosis
#13
Gulnur Kizilay, Yesim Hulya Uz, Gulay Seren, Enis Ulucam, Ali Yilmaz, Ziya Cukur, Umit Ali Kayisli
BACKGROUND: Endometriosis is one of the most common chronic gynecological diseases. OBJECTIVES: The aim of the study was to examine the effects of curcumin and/or deferoxamine on cell proliferation in a rat model of endometriosis. MATERIAL AND METHODS: Thirty female 12-week-old albino Wistar rats, weighing 200-250 g, were used in this study. All the rats underwent ovariectomy and 0.1-mg β-estradiol 17-valerate pellets were placed intraperitoneally...
March 2017: Advances in Clinical and Experimental Medicine: Official Organ Wroclaw Medical University
https://www.readbyqxmd.com/read/28781827/deferasirox-associated-with-liver-failure-and-death-in-a-sickle-cell-anemia-patient-homozygous-for-the-1774delg-polymorphism-in-the-abcc2-gene
#14
Caroline C B Braga, Bruno Deltreggia Benites, Dulcineia M de Albuquerque, Marisa C Alvarez, Tiago Seva-Pereira, Bruno K L Duarte, Fernando F Costa, Simone C O Gilli, Sara T O Saad
This manuscript describes the case of a patient with sickle cell anemia who died of fulminant hepatitis after therapy with the iron chelator Deferasirox. The patient was homozygous for the -1774delG polymorphism in the Abcc2 gene, which raises the concern about the use of hepatotoxic drugs in this specific context.
August 2017: Clinical Case Reports
https://www.readbyqxmd.com/read/28779994/the-iron-chelating-agent-deferoxamine-detoxifies-fe-salen-induced-cytotoxicity
#15
Masanari Umemura, Jeong-Hwan Kim, Haruki Aoyama, Yujiro Hoshino, Hidenobu Fukumura, Rina Nakakaji, Itaru Sato, Makoto Ohtake, Taisuke Akimoto, Masatoshi Narikawa, Ryo Tanaka, Takayuki Fujita, Utako Yokoyama, Masataka Taguri, Satoshi Okumura, Motohiko Sato, Haruki Eguchi, Yoshihiro Ishikawa
Iron-salen, i.e., μ-oxo-N,N'-bis(salicylidene)ethylenediamine iron (Fe(Salen)) was a recently identified as a new anti-cancer compound with intrinsic magnetic properties. Chelation therapy has been widely used in management of metallic poisoning, because an administration of agents that bind metals can prevent potential lethal effects of particular metal. In this study, we confirmed the therapeutic effect of deferoxamine mesylate (DFO) chelation against Fe(Salen) as part of the chelator antidote efficacy. DFO administration resulted in reduced cytotoxicity and ROS generation by Fe(Salen) in cancer cells...
July 25, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28777551/bifunctional-chelating-supramolecular-polymer-and-its-application-in-down-regulation-of-cellular-iron-uptake
#16
Fan Xu, Jing Jing, Xiuman Zhou, Yanwu Zhang
Bifunctional chelating supramolecular polymer (SP-Ch) is constructed from brush-like macromolecule (P-Ch) through hydrogen bonds. Two kinds of norbornene derivatives are used to synthesize P-Ch, in which phosphonic acid as side-group of polynorbornene can act as chelating group and ascorbic acid as side-chain capper of polynorbornene can reduce Fe3+ to Fe2+. It can attach to cell membranes and form two kinds of "barriers" to hinder cells from uptaking iron by virtue of phosphonic acid and ascorbic acid. Higher monomer conversion and polymerization degree of P-Ch are achieved when the ratio among M1, M2 and G2 is set as 50:10:1 and SP-Ch particles reach to submicron level (mean size 147...
August 4, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28777254/t-type-and-l-type-calcium-channel-blockers-for-the-treatment-of-cardiac-iron-overload-an-update
#17
Sirinart Kumfu, Siriporn C Chattipakorn, Nipon Chattipakorn
In thalassemia patients iron overload cardiomyopathy is a major cause of cardiac dysfunction and mortality. Despite many advances in the development of new iron chelating agents, heart failure still occurs in some patients and can lead to an increase in mortality rate. Recently, potential novel therapeutic strategies in the treatment of these patients have focused on L-type and T-type calcium channel blockers. These two channels have been reported as being the main routes for cardiac iron uptake under conditions of iron overload...
August 4, 2017: Journal of Cardiovascular Pharmacology
https://www.readbyqxmd.com/read/28774421/thalassaemia
#18
REVIEW
Ali T Taher, David J Weatherall, Maria Domenica Cappellini
Inherited haemoglobin disorders, including thalassaemia and sickle-cell disease, are the most common monogenic diseases worldwide. Several clinical forms of α-thalassaemia and β-thalassaemia, including the co-inheritance of β-thalassaemia with haemoglobin E resulting in haemoglobin E/β-thalassaemia, have been described. The disease hallmarks include imbalance in the α/β-globin chain ratio, ineffective erythropoiesis, chronic haemolytic anaemia, compensatory haemopoietic expansion, hypercoagulability, and increased intestinal iron absorption...
July 31, 2017: Lancet
https://www.readbyqxmd.com/read/28772256/non-syndromic-childhood-onset-congenital-sideroblastic-anemia-a-report-of-13-patients-identified-with-an-alas2-or-slc25a38-mutation
#19
Marie-Amelyne Le Rouzic, Cyrielle Fouquet, Thierry Leblanc, Mohamed Touati, Fanny Fouyssac, Christiane Vermylen, Nadja Jäkel, Jean-François Guichard, Karim Maloum, Fabienne Toutain, Patrick Lutz, Yves Perel, Hana Manceau, Caroline Kannengiesser, Jean-Pierre Vannier
The most frequent germline mutations responsible for non syndromic congenital sideroblastic anemia are identified in ALAS2 and SLC25A38 genes. Iron overload is a key issue and optimal chelation therapy should be used to limit its adverse effects on the development of children. Our multicentre retrospective descriptive study compared the strategies for diagnosis and management of congenital sideroblastic anemia during the follow-up of six patients with an ALAS2 mutation and seven patients with an SLC25A38 mutation...
July 26, 2017: Blood Cells, Molecules & Diseases
https://www.readbyqxmd.com/read/28772085/succinate-iron-chelation-and-monovalent-cations-affect-the-transformation-efficiency-of-acinetobacter-baylyi-strain-atcc33305-during-growth-in-complex-media
#20
Colleen G Leong, Caroline M Boyd, Kaleb S Roush, Ricardo Tenente, Kristine M Lang, Phoebe Lostroh
Natural transformation is the acquisition of new genetic material via the uptake of exogenous DNA by competent bacteria. Acinetobacter baylyi is model for natural transformation. Here we focus on natural transformation of A. baylyi strain ATCC33305 grown in complex media and seek environmental conditions that appreciably affect transformation efficiency. We find that the transformation efficiency for A. baylyi is a resilient characteristic that remains high under most conditions tested. We do find several distinct conditions that alter natural transformation efficiency including addition of succinate, Fe2+ (ferrous) iron chelation, and substitution of sodium ions with potassium ones...
August 3, 2017: Canadian Journal of Microbiology
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