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Iron chelation

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https://www.readbyqxmd.com/read/28926421/a-novel-hydroxyphenyl-hydrazone-derivate-ycl0426-inhibits-cancer-cell-proliferation-through-sequestering-iron
#1
Feifei Li, Long Long, Junhai Xiao, Chen Wang, Wei Li, Song Li, Changqi Zhao, Lili Wang
Cancer cells have an increased requirement for iron than normal cells, and iron chelators are under active consideration for cancer treatment. The metal-sequestering potential and antiproliferative mechanisms of a novel hydroxyphenyl hydrazone derivate YCL0426 were investigated here. Antiproliferative activity of YCL0426 was detected by MTT assay. The iron-sequestering potential was evaluated by ferrozine-Fe(II) sequestering assay and Fe(II) titration assay. Cell-cycle-arresting profile was checked by flow cytometry and the DNA synthesis status was evaluated by BrdU incorporation assay...
September 18, 2017: Anti-cancer Drugs
https://www.readbyqxmd.com/read/28924413/pseudovitelliform-maculopathy-associated-with-deferoxamine-toxicity-multimodal-imaging-and-electrophysiology-of-a-rare-entity
#2
Kelly M Bui, SriniVas R Sadda, Hani Salehi-Had
Deferoxamine is a commonly used chelating agent for secondary hemochromatosis. We report a rare retinal manifestation of deferoxamine toxicity in a 68-year-old man and provide supporting multimodal imaging and electrophysiology. The patient had iron overload related to transfusion-dependent myelodysplastic syndrome and developed a pseudovitelliform macular lesion related to deferoxamine toxicity. We also describe for the first time the worsening of this maculopathy on deferasirox, an alternative chelating agent...
2017: Digital Journal of Ophthalmology: DJO
https://www.readbyqxmd.com/read/28912885/brusatol-mediated-inhibition-of-c-myc-increases-hif-1%C3%AE-degradation-and-causes-cell-death-in-colorectal-cancer-under-hypoxia
#3
Eun-Taex Oh, Chan Woo Kim, Ha Gyeong Kim, Jae-Seon Lee, Heon Joo Park
HIF-1 (hypoxia-inducible factor-1) regulates the expression of ~100 genes involved in angiogenesis, metastasis, tumor growth, chemoresistance and radioresistance, underscoring the growing interest in targeting HIF-1 for cancer control. In the present study, we investigated the molecular mechanisms underlying brusatol-induced HIF-1α degradation and cell death in colorectal cancer under hypoxia (0.5% O2). Under hypoxia, pretreatment of cancer cells with brusatol increased HIF-1α degradation and cancer cell death in a dose-dependent manner...
2017: Theranostics
https://www.readbyqxmd.com/read/28912459/iron-deposition-is-associated-with-differential-macrophage-infiltration-and-therapeutic-response-to-iron-chelation-in-prostate-cancer
#4
Avigdor Leftin, Huiyong Zhao, Mesru Turkekul, Elisa de Stanchina, Katia Manova, Jason A Koutcher
Immune cells such as macrophages are drivers and biomarkers of most cancers. Scoring macrophage infiltration in tumor tissue provides a prognostic assessment that is correlated with disease outcome and therapeutic response, but generally requires invasive biopsy. Routine detection of hemosiderin iron aggregates in macrophages in other settings histologically and in vivo by MRI suggests that similar assessments in cancer can bridge a gap in our ability to assess tumor macrophage infiltration. Quantitative histological and in vivo MRI assessments of non-heme cellular iron revealed that preclinical prostate tumor models could be differentiated according to hemosiderin iron accumulation-both in tumors and systemically...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28910980/neuroprotective-effect-of-deferoxamine-on-n-methyl-d-aspartate-induced-excitotoxicity-in-rgc-5-cells
#5
Ying Tian, Ye He, Weitao Song, Endong Zhang, Xiaobo Xia
Many N-methyl-d-aspartate (NMDA) receptor antagonists have been used to treat neurodegenerative diseases induced by glutamate excitotoxicity in clinics. However, the universality of the glutamic acid neurotransmitter system makes the glutamic acid receptor blockers inefficient and unsafe. Thus, regulating the downstream signaling pathway in the excitotoxicity of glutamic acid may be a more effective and safer way to antagonize the glutamic acid receptor. In this study, we investigated the effect of deferoxamine (DFO), an iron chelator, on the NMDA-induced excitotoxicity...
September 1, 2017: Acta Biochimica et Biophysica Sinica
https://www.readbyqxmd.com/read/28902140/iron-absorption-from-three-commercially-available-supplements-in-gastrointestinal-cell-lines
#6
Francesca Uberti, Vera Morsanuto, Sabrina Ghirlanda, Claudio Molinari
This study compares the absorption characteristics of two iron-based dietary supplements and their biocompatibility to bisglycinate iron, a common chelated iron form. The Caco-2 cell line-a model of human intestinal absorption-and GTL-16 cell line-a model of gastric epithelial cells-were used to perform the experiments; in the first experiments, the kinetics of absorption have been evaluated analyzing the divalent metal transporter 1 (DMT1) expression. Three different iron combinations containing 50 µM iron (named Fisioeme(®), Sideral(®) and bisglycinate) were used for different stimulation times (1-24 h)...
September 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28898846/synthesis-of-a-novel-magnetic-nano-scale-biosorbent-using-extracellular-polymeric-substances-from-klebsiella-sp-j1-for-tetracycline-adsorption
#7
Shanshan Pi, Ang Li, Wei Wei, Liang Feng, Guangshan Zhang, Ting Chen, Xue Zhou, Huihang Sun, Fang Ma
The magnetic nano-scale biosorbent (Fe3O4/MFX) was synthesized by the chelation and cross-linking procedure with extracellular polymeric substances (MFX) and Fe3O4. Fe3O4/MFX possessed the porous structure and numerous functional groups (i.e., amino, carboxyl, and hydroxyl), and its core region had a typical size of ∼11nm. The maximum adsorption capacity was 56.04mgg(-1) at pH 6.0, 10mgL(-1) of tetracycline, and 160mgL(-1) of Fe3O4/MFX. The data is properly fitted by the Langmuir, Freundlich, and pseudo-second-order kinetics models...
September 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28894564/should-every-patient-with-mds-get-iron-chelation-probably-yes
#8
COMMENT
Kanjaksha Ghosh, Kinjalka Ghosh
No abstract text is available yet for this article.
2017: Mediterranean Journal of Hematology and Infectious Diseases
https://www.readbyqxmd.com/read/28893230/assessment-of-free-radical-scavenging-and-anti-proliferative-activities-of-tinospora-cordifolia-miers-willd
#9
Picheswara Rao Polu, Udupa Nayanbhirama, Saleemulla Khan, Rajlexmi Maheswari
BACKGROUND: Tinospora cordifolia (Guduchi or Amrita) is an important drug of Ayurvedic System of Medicine and found mention in various classical texts for the treatment of diseases such as jaundice, fever, diabetes, cancer and skin disease etc. In view of its traditional claims, antioxidant and anti-proliferative activities were evaluated in the present study. METHODS: Ethanol extract (TCE) and subsequent petroleum ether (TCP), dichloromethane (TCD), n-Butanol (TCB) and aqueous (TCA) fractions of were prepared from stems of T cordifolia...
September 11, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28888202/iron-accumulation-in-senescent-cells-is-coupled-with-impaired-ferritinophagy-and-inhibition-of-ferroptosis
#10
Shashank Masaldan, Sharnel A S Clatworthy, Cristina Gamell, Peter M Meggyesy, Antonia-Tonia Rigopoulos, Sue Haupt, Ygal Haupt, Delphine Denoyer, Paul A Adlard, Ashley I Bush, Michael A Cater
Cellular senescence is characterised by the irreversible arrest of proliferation, a pro-inflammatory secretory phenotype and evasion of programmed cell death mechanisms. We report that senescence alters cellular iron acquisition and storage and also impedes iron-mediated cell death pathways. Senescent cells, regardless of stimuli (irradiation, replicative or oncogenic), accumulate vast amounts of intracellular iron (up to 30-fold) with concomitant changes in the levels of iron homeostasis proteins. For instance, ferritin (iron storage) levels provided a robust biomarker of cellular senescence, for associated iron accumulation and for resistance to iron-induced toxicity...
September 1, 2017: Redox Biology
https://www.readbyqxmd.com/read/28886484/augmentation-of-intracellular-iron-using-iron-sucrose-enhances-the-toxicity-of-pharmacological-ascorbate-in-colon-cancer-cells
#11
Kristin E Brandt, Kelly C Falls, Joshua D Schoenfeld, Samuel N Rodman, Zhimin Gu, Fenghuang Zhan, Joseph J Cullen, Brett A Wagner, Garry R Buettner, Bryan G Allen, Daniel J Berg, Douglas R Spitz, Melissa A Fath
Pharmacological doses (> 1mM) of ascorbate (a.k.a., vitamin C) have been shown to selectively kill cancer cells through a mechanism that is dependent on the generation of H2O2 at doses that are safely achievable in humans using intravenous administration. The process by which ascorbate oxidizes to form H2O2 is thought to be mediated catalytically by redox active metal ions such as iron (Fe). Because intravenous iron sucrose is often administered to colon cancer patients to help mitigate anemia, the current study assessed the ability of pharmacological ascorbate to kill colon cancer cells in the presence and absence of iron sucrose...
August 26, 2017: Redox Biology
https://www.readbyqxmd.com/read/28881661/combination-of-fe-cu-chelators-and-docosahexaenoic-acid-an-exploration-for-the-treatment-of-colorectal-cancer
#12
Nanhui Yu, Hong Zhu, Yuan Yang, Yiming Tao, Fengbo Tan, Qian Pei, Yuan Zhou, Xiangping Song, Qiurong Tan, Haiping Pei
Colorectal cancer (CRC) is one of the major causes of cancer deaths in the world. 5-fluorouracil (5-FU) -based chemotherapy is a common choice for patients with CRC; unfortunately, the benefit is rather limited due to the acquisition of drug resistance. Therefore, the alternative therapeutic strategies are required. The activation of autophagic mechanism was considered as the main cause of the acquisition of drug resistance in 5-FU treatment. Docosahexaenoic acid (DHA), a fatty acid, has been regarded as an efficient anticancer agent and can improve the drug resistance in conventional cancer therapy by a low basal level of autophagy in colon cancer cells...
August 1, 2017: Oncotarget
https://www.readbyqxmd.com/read/28881326/remediation-of-electronic-waste-polluted-soil-using-a-combination-of-persulfate-oxidation-and-chemical-washing
#13
Fu Chen, Zhanbin Luo, Gangjun Liu, Yongjun Yang, Shaoliang Zhang, Jing Ma
Laboratory experiments were conducted to investigate the efficiency of a simultaneous chemical extraction and oxidation for removing persistent organic pollutants (POPs) and toxic metals from an actual soil polluted by the recycling activity of electronic waste. Various chemicals, including hydroxypropyl-β-cyclodextrin (HPCD), citric acid (CA) and sodium persulfate (SP) were applied synchronously with Fe(2+) activated oxidation to enhance the co-removal of both types of pollutants. It is found that the addition of HPCD can enhance POPs removal through solubilization of POPs and iron chelation; while the CA-chelated Fe(2+) activation process is effective for extracting metals and degrading residual POPs...
September 4, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28880786/low-molecular-weight-iron-chelates-may-be-an-alternative-to-gadolinium-based-contrast-agents-for-t1-weighted-contrast-enhanced-mr-imaging
#14
Philipp Boehm-Sturm, Akvile Haeckel, Ralf Hauptmann, Susanne Mueller, Christiane K Kuhl, Eyk A Schellenberger
Purpose To synthesize two low-molecular-weight iron chelates and compare their T1 contrast effects with those of a commercial gadolinium-based contrast agent for their applicability in dynamic contrast material-enhanced (DCE) magnetic resonance (MR) imaging. Materials and Methods The animal experiments were approved by the local ethics committee. Two previously described iron (Fe) chelates of pentetic acid (Fe-DTPA) and of trans-cyclohexane diamine tetraacetic acid (Fe-tCDTA) were synthesized with stability constants several orders of magnitude higher than those of gadolinium-based contrast agents...
January 7, 2017: Radiology
https://www.readbyqxmd.com/read/28878728/patient-affected-by-beta-propeller-protein-associated-neurodegeneration-a-therapeutic-attempt-with-iron-chelation-therapy
#15
Mattia Fonderico, Michele Laudisi, Nico Golfrè Andreasi, Stefania Bigoni, Costanza Lamperti, Celeste Panteghini, Barbara Garavaglia, Miryam Carecchio, Elia Antonio Emanuele, Gian L Forni, Enrico Granieri
Here, we report the case of a 36-year-old patient with a diagnosis of de novo mutation of the WDR45 gene, responsible for beta-propeller protein-associated neurodegeneration, a phenotypically distinct, X-linked dominant form of Neurodegeneration with Brain Iron Accumulation. The clinical history is characterized by a relatively stable intellectual disability and a hypo-bradykinetic and hypertonic syndrome with juvenile onset. Genetic investigations and T1 and T2-weighted MR images align with what is described in literature...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28875336/progression-of-liver-fibrosis-can-be-controlled-by-adequate-chelation-in-transfusion-dependent-thalassemia-tdt
#16
D Maira, E Cassinerio, A Marcon, M Mancarella, M Fraquelli, P Pedrotti, M D Cappellini
A substantial proportion of patients with transfusion-dependent beta-thalassemia major suffer from chronic liver disease. Iron overload resulting from repeated transfusions and HCV infection has been implicated in the development of liver fibrosis. Hepatic siderosis and fibrosis were assessed in 99 transfusion-dependent thalassemia (TDT) patients using transient elastography (TE) and liver iron concentration (LIC) assessed by T2*MRI at baseline and after 4 years. Data were analyzed retrospectively. At baseline, the overall mean liver stiffness measurement (LSM) was 7...
September 5, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28873743/inhibition-of-tyrosinase-by-cherimoya-pericarp-proanthocyanidins-structural-characterization-inhibitory-activity-and-mechanism
#17
Wei-Ming Chai, Mei-Zhen Lin, Ying-Xia Wang, Kai-Li Xu, Wen-Yang Huang, Dan-Dan Pan, Zheng-Rong Zou, Yi-Yuan Peng
In this study, the structure of proanthocyanidins purified from cherimoya (Annona squamosa) pericarp was analyzed by ESI-QTOF-MS and HPLC analyses. The result indicated that these compounds were procyanidin-type proanthocyanidins, consisting mainly of (epi)catechin units linked b y B-type interflavan bonds. The analyses of enzymology showed that the activities of monophenolase and diphenolase of tyrosinase could be powerfully inhibited by the proanthocyanidins. Further researches on the inhibition mechanism demonstrated that they were reversible and competitive inhibitors with the KI value of 27...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28872065/synthesis-and-characterization-of-cryptand-222-potassium-2-methylimidazolato-meso-tetraphenylporphinato-ferrate-ii-2-methylimidazole-tetrahydrofuran-1-1-2
#18
Qi Wu, Zhen Yao, Jianfeng Li
Metalloporphyrin complexes containing an additional imidazole ligand can provide information about the effect of deprotonation or hydrogen bonding on the axial histidine unit in heme proteins. The title high-spin five-coordinate imidazolate-ligated iron(II) porphyrinate, [K(C18H36N2O6)][Fe(C4H5N2)(C44H28N4)]·C4H6N2·2C4H8O, has been synthesized and investigated. The solvated salt crystallizes with one 2-methylimidazole molecule, two tetrahydrofuran solvent molecules and a potassium cation chelated inside a cryptand-222 (4,7,13,16,21,24-hexaoxa-1,10-diazabicyclo[8...
September 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28871478/the-iron-chelate-transporter-osysl9-plays-a-role-in-iron-distribution-in-developing-rice-grains
#19
Takeshi Senoura, Emi Sakashita, Takanori Kobayashi, Michiko Takahashi, May Sann Aung, Hiroshi Masuda, Hiromi Nakanishi, Naoko K Nishizawa
Rice OsYSL9 is a novel transporter for Fe(II)-nicotianamine and Fe(III)-deoxymugineic acid that is responsible for internal iron transport, especially from endosperm to embryo in developing seeds. Metal chelators are essential for safe and efficient metal translocation in plants. Graminaceous plants utilize specific ferric iron chelators, mugineic acid family phytosiderophores, to take up sparingly soluble iron from the soil. Yellow Stripe 1-Like (YSL) family transporters are responsible for transport of metal-phytosiderophores and structurally similar metal-nicotianamine complexes...
September 4, 2017: Plant Molecular Biology
https://www.readbyqxmd.com/read/28870898/inhibitory-activity-of-iron-chelators-ata-and-dfo-on-mcf-7-breast-cancer-cells-and-phosphatases-ptp1b-and-shp2
#20
Alicja Kuban-Jankowska, Kamlesh K Sahu, Magdalena Gorska-Ponikowska, Jack A Tuszynski, Michal Wozniak
BACKGROUND: Rapidly-dividing cancer cells have higher requirement for iron compared to non-transformed cells, making iron chelating a potential anticancer strategy. In the present study we compared the anticancer activity of uncommon iron chelator aurintricarboxylic acid (ATA) with the known deferoxamine (DFO). MATERIALS AND METHODS: We investigated the impact of ATA and DFO on the viability and proliferation of MCF-7 cancer cells. Moreover we performed enzymatic activity assays and computational analysis of the ATA and DFO effects on pro-oncogenic phosphatases PTP1B and SHP2...
September 2017: Anticancer Research
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