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Iron homeostasis

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https://www.readbyqxmd.com/read/29054020/unraveling-the-mechanisms-behind-iron-overload-and-ineffective-hematopoiesis-in-myelodysplastic-syndromes
#1
REVIEW
Emanuele Angelucci, Paolo Cianciulli, Carlo Finelli, Cristina Mecucci, Maria Teresa Voso, Sante Tura
Myelodysplastic syndromes (MDS) are a group of clonally-acquired blood disorders characterized by ineffective hematopoiesis leading to cytopenias. Red blood cell transfusions are an important component of supportive care in patients with MDS. Prolonged exposure to transfusions can lead to iron overload, which results in iron-induced toxicity caused by the production of reactive oxygen species (ROS). ROS accumulation has detrimental effects also on hematopoietic stem cells and may contribute to MDS progression...
October 5, 2017: Leukemia Research
https://www.readbyqxmd.com/read/29043249/interactions-between-bacteria-and-bile-salts-in-the-gastrointestinal-and-hepatobiliary-tracts
#2
REVIEW
Verónica Urdaneta, Josep Casadesús
Bile salts and bacteria have intricate relationships. The composition of the intestinal pool of bile salts is shaped by bacterial metabolism. In turn, bile salts play a role in intestinal homeostasis by controlling the size and the composition of the intestinal microbiota. As a consequence, alteration of the microbiome-bile salt homeostasis can play a role in hepatic and gastrointestinal pathological conditions. Intestinal bacteria use bile salts as environmental signals and in certain cases as nutrients and electron acceptors...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/29040572/biallelic-mutations-in-the-ferredoxin-reductase-gene-cause-novel-mitochondriopathy-with-optic-atrophy
#3
Yanyan Peng, Deepali N Shinde, Alex C Valencia, Jun-Song Mo, Jill Rosenfeld, Megan Truitt Cho, Adam Chamberlin, Zhuo Li, Jie Liu, Baoheng Gui, Rachel Brockhage, Alice Basinger, Brenda Alvarez-Leon, Peter Heydemann, Pilar L Magoulas, Andrea M Lewis, Fernando Scaglia, Solange Gril, Shuk Ching Chong, Matthew Bower, Kristin G Monaghan, Rebecca Willaert, Maria-Renee Plona, Rich Dineen, Francisca Milan, George Hoganson, Zoe Powis, Katherine L Helbig, Jennifer Keller-Ramey, Belinda Harris, Laura C Anderson, Torrian Green, Stacey J Sukoff Rizzo, Julie Kaylor, Jiani Chen, Min-Xin Guan, Elizabeth Sellars, Steven P Sparagana, James B Gibson, Laura G Reinholdt, Sha Tang, Taosheng Huang
Iron-sulfur (Fe-S) clusters are ubiquitous cofactors essential to various cellular processes, including mitochondrial respiration, DNA repair, and iron homeostasis. A steadily increasing number of disorders are being associated with disrupted biogenesis of Fe-S clusters. Here, we conducted whole-exome sequencing of patients with optic atrophy and other neurological signs of mitochondriopathy and identified 17 individuals from 13 unrelated families with recessive mutations in FDXR, encoding the mitochondrial membrane-associated flavoprotein ferrodoxin reductase required for electron transport from NADPH to cytochrome P450...
October 5, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/29039462/antiproliferative-activity-of-di-2-pyridylhydrazone-dithiocarbamate-acetate-partly-involved-in-p53-mediated-apoptosis-and-autophagy
#4
Tingting Wang, Youxun Liu, Yun Fu, Tengfei Huang, Yun Yang, Shaoshan Li, Changzheng Li
Cancer cells have higher demand of iron and copper ions for growth, disturbing the metal's homeostasis can inhibit proliferation of cancer cell. Dithiocarbamates possessing excellent metal chelating ability and antitumor activity are considered as candidates in chelation therapy, however, their antitumor molecular mechanisms remain to be elucidated. In the present study, a dithiocarbamate derivative, di-2-pyridylhydrazone dithiocarbamate s-acetic acid (DpdtaA) was prepared to address the issue whether the molecular mechanism behind biological behavior showed by dithiocarbamate was p53 mediated...
October 10, 2017: International Journal of Oncology
https://www.readbyqxmd.com/read/29039220/function-of-glutaredoxin-3-grx3-in-oxidative-stress-response-caused-by-iron-homeostasis-disorder-in-candida-albicans
#5
Dan Zhang, Yijie Dong, Qilin Yu, Zhang Kai, Meng Zhang, Chang Jia, Chenpeng Xiao, Bing Zhang, Biao Zhang, Mingchun Li
AIM: Glutaredoxin is a conserved oxidoreductase in eukaryotes and prokaryotes. This study aimed to determine the role of Grx3 in cell survival, iron homeostasis and the oxidative stress response in Candida albicans. MATERIALS & METHODS: A grx3Δ/Δ mutant was obtained using PCR-mediated homologs recombination. The function of Grx3 was investigated by a series of biochemical methods. RESULTS: Deletion of GRX3 impaired growth and cell cycle, disturbance of iron homeostasis and activated the oxidative stress response...
October 17, 2017: Future Microbiology
https://www.readbyqxmd.com/read/29036914/molecular-characterization-and-functional-analysis-of-a-ferritin-heavy-chain-subunit-from-the-eri-silkworm-samia-cynthia-ricini
#6
Hai-Zhong Yu, Shang-Zhi Zhang, Yan Ma, Dong-Qiong Fei, Bing Li, Li-Ang Yang, Jie Wang, Zhen Li, Azharuddin Muhammad, Jia-Ping Xu
Ferritins are conserved iron-binding proteins that are primarily involved in iron storage, detoxification and the immune response. Despite the importance of ferritin in organisms, little is known about their roles in the eri-silkworm (Samia cynthia ricini). We previously identified a ferritin heavy chain subunit named ScFerHCH in the S. c. ricini transcriptome database. The full-length S. c. ricini ferritin heavy chain subunit (ScFerHCH) was 1863 bp and encoded a protein of 231 amino acids with a deduced molecular weight of 25...
October 14, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29034829/the-impact-of-obesity-on-brain-iron-levels-and-%C3%AE-synuclein-expression-is-regionally-dependent
#7
Jian Han, Justin Plummer, Lumei Liu, Aria Byrd, Michael Aschner, Keith M Erikson
BACKGROUND: The importance of iron homeostasis is particularly apparent in the brain, where iron deficiency results in impaired cognition and iron accumulation is associated with neurodegenerative diseases. Obesity is linked to iron deficiency systemically, but the effects of obesity on brain iron and its associated consequences, including neurodegenerative processes remain unexplored. This preliminary study examined the effect of dietary-induced obesity on brain regional iron, α-synuclein expression, and F2-isoprostane (oxidative stress marker) concentrations in selected brain regions...
October 16, 2017: Nutritional Neuroscience
https://www.readbyqxmd.com/read/29032057/the-hog1p-kinase-regulates-aft1p-transcription-factor-to-control-iron-accumulation
#8
Telma S Martins, Clara Pereira, David Canadell, Rita Vilaça, Vítor Teixeira, Pedro Moradas-Ferreira, Eulàlia de Nadal, Francesc Posas, Vítor Costa
Iron acquisition systems have to be tightly regulated to assure a continuous supply of iron, since it is essential for survival, but simultaneously to prevent iron overload that is toxic to the cells. In budding yeast, the low‑iron sensing transcription factor Aft1p is a master regulator of the iron regulon. Our previous work revealed that bioactive sphingolipids modulate iron homeostasis as yeast cells lacking the sphingomyelinase Isc1p exhibit an upregulation of the iron regulon. In this study, we show that Isc1p impacts on iron accumulation and localization...
October 11, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29029193/sex-and-iron-modify-fibroblast-growth-factor-23-fgf23-concentration-in-1-year-old-children
#9
Elisa Holmlund-Suila, Maria Enlund-Cerullo, Saara Valkama, Helena Hauta-Alus, Jenni Rosendahl, Otto Helve, Timo Hytinantti, Heli Viljakainen, Sture Andersson, Outi Mäkitie
Context: Fibroblast growth factor 23 (FGF23) plays an important role in phosphate homeostasis but its regulation is inadequately characterized. Objective: To examine regulators of FGF23, especially sex and iron status, in early childhood. Design: A cross-sectional study involving 1-year-old children. Setting and participants: Healthy term infants with a birth weight appropriate for gestational age were recruited to an ongoing vitamin D trial at the Kätilöopisto Maternity Hospital, Helsinki, Finland...
October 5, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29027371/differential-proteomic-analysis-of-dimethylnitrosamine-dmn-induced-liver-fibrosis
#10
Xiujie Liu, Rongji Dai, Ming Ke, Imran Suheryani, Weiwei Meng, Yulin Deng
Liver fibrosis is a common pathological feature of many chronic liver diseases. To characterize the entire panorama of proteome changes in DMN-induced liver fibrosis, iTRAQ-based differential proteomic analysis was performed with DMN-induced liver fibrosis rats. A total of 4155 confidently identified proteins were found, with 365 proteins showing significant changes (fold changes of >1.5 or < 0.67, P < 0.05). In metabolic activation, proteins assigned to drug metabolism enzymes (e.g., CYP2D1) changed, suggesting that the liver protection mechanism was activated to relieve DMN toxicity...
October 13, 2017: Proteomics
https://www.readbyqxmd.com/read/29026901/dietary-iron-loading-negatively-affects-liver-mitochondrial-function
#11
Chiara Volani, Carolina Doerrier, Egon Demetz, David Haschka, Giuseppe Paglia, Alexandros A Lavdas, Erich Gnaiger, Guenter Weiss
Iron is an essential co-factor for several metabolic processes, including mitochondrial respiration, and mitochondria are the major sites of iron-utilization. Cellular iron homeostasis must be tightly regulated, as intracellular iron deficiency can lead to insufficient energy production, whereas iron overload triggers ROS (reactive oxygen species) formation via the Fenton reaction. So far little is known on how iron imbalances affect mitochondrial function in vivo and the impact of the genotype on that, we studied the effects of dietary iron loading on mitochondrial respiratory capacity in liver by comparing two genetically divergent mouse strains, namely C57BL/6N and FVB mice...
October 13, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29022497/estrogen-induced-disruption-of-intracellular-iron-metabolism-leads-to-oxidative-stress-membrane-damage-and-cell-cycle-arrest-in-mcf-7-cells
#12
Khuloud Bajbouj, Jasmin Shafarin, Maher Y Abdalla, Iman M Ahmad, Mawieh Hamad
It is well established that several forms of cancer associate with significant iron overload. Recent studies have suggested that estrogen (E2) disrupts intracellular iron homeostasis by reducing hepcidin synthesis and maintaining ferroportin integrity. Here, the ability of E2 to alter intracellular iron status and cell growth potential was investigated in MCF-7 cells treated with increasing concentrations of E2. Treated cells were assessed for intracellular iron status, the expression of key proteins involved in iron metabolism, oxidative stress, cell survival, growth, and apoptosis...
October 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/29019354/iron-sulfur-cluster-biosynthesis-and-trafficking-impact-on-human-disease-conditions
#13
C Wachnowsky, I Fidai, J A Cowan
Iron-sulfur clusters (Fe-S) are one of the most ancient, ubiquitous and versatile classes of metal cofactors found in nature. Proteins that contain Fe-S clusters constitute one of the largest families of proteins, with varied functions that include electron transport, regulation of gene expression, substrate binding and activation, radical generation, and, more recently discovered, DNA repair. Research during the past two decades has shown that mitochondria are central to the biogenesis of Fe-S clusters in eukaryotic cells via a conserved cluster assembly machinery (ISC assembly machinery) that also controls the synthesis of Fe-S clusters of cytosolic and nuclear proteins...
October 11, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29017023/maternal-iron-nutriture-as-a-critical-modulator-of-fasd-risk-in-alcohol-exposed-pregnancies
#14
Kaylee K Helfrich, Nipun Saini, Pamela J Kling, Susan M Smith
Alcohol consumption during pregnancy places the fetus at risk for permanent physical, cognitive, and behavioral impairments, collectively termed fetal alcohol spectrum disorders (FASD). However, prenatal alcohol exposure (PAE) outcomes vary widely, and growing evidence suggests that maternal nutrition is a modifying factor. Certain nutrients, such as iron, may modulate FASD outcomes. Untreated gestational iron deficiency (ID) causes persistent neurodevelopmental deficits in the offspring that affect many of the same domains damaged by PAE...
October 10, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28993663/renal-iron-accumulation-occurs-in-lupus-nephritis-and-iron-chelation-delays-the-onset-of-albuminuria
#15
Eileen S Marks, Mathilde L Bonnemaison, Susan K Brusnahan, Wenting Zhang, Wei Fan, Jered C Garrison, Erika I Boesen
Proteins involved in iron homeostasis have been identified as biomarkers for lupus nephritis, a serious complication of systemic lupus erythematosus (SLE). We tested the hypothesis that renal iron accumulation occurs and contributes to renal injury in SLE. Renal non-heme iron levels were increased in the (New Zealand Black x New Zealand White) F1 (NZB/W) mouse model of lupus nephritis compared with healthy New Zealand White (NZW) mice in an age- and strain-dependent manner. Biodistribution studies revealed increased transferrin-bound iron accumulation in the kidneys of albuminuric NZB/W mice, but no difference in the accumulation of non-transferrin bound iron or ferritin...
October 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28993186/experimental-oral-iron-administration-histological-investigations-and-expressions-of-iron-handling-proteins-in-rat-retina-with-aging
#16
Pankaj Kumar, Tapas Chandra Nag, Kumar Abhiram Jha, Sanjay Kumar Dey, Poorti Kathpalia, Meenakshi Maurya, Chandan Lal Gupta, Jagriti Bhatia, Tara Sankar Roy, Shashi Wadhwa
Iron is implicated in age-related macular degeneration (AMD). The aim of this study was to see if long-term, experimental iron administration with aging modifies retinal and choroidal structures and expressions of iron handling proteins, to understand some aspects of iron homeostasis. Male Wistar rats were fed with ferrous sulphate heptahydrate (500mg/kg body weight/week, oral; elemental iron availability: 20%) from 2 months of age onward until they were 19.5 month-old. At 8, 14 and 20 months of age, they were sacrificed and serum and retinal iron levels were detected by HPLC...
October 6, 2017: Toxicology
https://www.readbyqxmd.com/read/28991683/a-new-pla2g6-mutation-in-a-family-with-infantile-neuroaxonal-dystrophy
#17
Iannello Grazia, Graziano Claudio, Cenacchi Giovanna, Cordelli Duccio Maria, Zuntini Roberta, Papa Valentina, Magistà Anna Maria, Gagliardi Monica, Procopio Radha, Quattrone Aldo, Annesi Grazia
Phospholipase A2-associated neurodegeneration (PLAN), a syndrome of Neurodegeneration with Brain Iron Accumulation (NBIA), is an autosomal recessive disorder caused by mutations in PLA2G6 gene. This gene encodes a calcium-independent group VI phospholipase A2 (iPLA-VI) critical in cell membrane homeostasis. PLAN syndrome encompasses a group of phenotypes with a different age of onset: classic infantile neuroaxonal dystrophy (INAD), atypical neuroaxonal dystrophy of childhood-onset (atypical NAD) and adult-onset PLA2G6-related dystonia-parkinsonism (PARK14)...
October 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28984829/potential-toxicity-and-underlying-mechanisms-associated-with-pulmonary-exposure-to-iron-oxide-nanoparticles-conflicting-literature-and-unclear-risk
#18
REVIEW
Tiffany G Kornberg, Todd A Stueckle, James A Antonini, Yon Rojanasakul, Vincent Castranova, Yong Yang, Liying Wang
Fine/micron-sized iron oxide particulates are incidentally released from a number of industrial processes, including iron ore mining, steel processing, welding, and pyrite production. Some research suggests that occupational exposure to these particulates is linked to an increased risk of adverse respiratory outcomes, whereas other studies suggest that iron oxide is biologically benign. Iron oxide nanoparticles (IONPs), which are less than 100 nm in diameter, have recently surged in use as components of novel drug delivery systems, unique imaging protocols, as environmental catalysts, and for incorporation into thermoplastics...
October 6, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28978947/ampk-is-not-required-for-the-effect-of-metformin-on-the-inhibition-of-bmp6-induced-hepcidin-gene-expression-in-hepatocytes
#19
Jean-Christophe Deschemin, Marc Foretz, Benoit Viollet, Sophie Vaulont
The biguanide metformin is used for its antidiabetic effect for many years but how metformin acts remains poorly understood and controversial. AMP-activated protein kinase (AMPK), a protein kinase that plays a key role in maintaining energy homeostasis, is assumed to be one of the prime targets of metformin. However, since our demonstration that AMPK is not required for the beneficial effects of metformin on the control of glycemia, the list of AMPK-independent actions of metformin is rapidly increasing. Given the conflicting results on the effects of metformin we sought, using our genetic mouse models deficient in the catalytic subunits of AMPK, to determine whether this kinase is involved in the effects of metformin on the expression of the iron-regulatory hormone hepcidin, as recently proposed...
October 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28978826/progress-in-iron-metabolism-research
#20
Hiroshi Kawabata
Iron is essential for various cellular processes, but an excess of iron may cause organ damage through the production of reactive oxygen species. Therefore, the amount of iron in the body must be strictly controlled. The central regulator of systemic iron homeostasis is hepcidin, which is primarily produced in the liver. Various molecules, including HFE, transferrin receptor 2 (TFR2), and hemojuvelin (HJV), are involved in sensing systemic iron status. Hepatocytes produce hepcidin in response to excess iron and inflammatory stimuli (e...
2017: [Rinshō Ketsueki] the Japanese Journal of Clinical Hematology
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