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Iron avidity

David Sulzer, Clifford Cassidy, Guillermo Horga, Un Jung Kang, Stanley Fahn, Luigi Casella, Gianni Pezzoli, Jason Langley, Xiaoping P Hu, Fabio A Zucca, Ioannis U Isaias, Luigi Zecca
The diagnosis of Parkinson's disease (PD) occurs after pathogenesis is advanced and many substantia nigra (SN) dopamine neurons have already died. Now that therapies to block this neuronal loss are under development, it is imperative that the disease be diagnosed at earlier stages and that the response to therapies is monitored. Recent studies suggest this can be accomplished by magnetic resonance imaging (MRI) detection of neuromelanin (NM), the characteristic pigment of SN dopaminergic, and locus coeruleus (LC) noradrenergic neurons...
2018: NPJ Parkinson's Disease
Manjunath Havalappa Dodamani, Rajiv Ranjan Kumar, Mayur Parkhi, Rajendar Basher
A 44-year-old man presented with fever (low to high grade) for 2-month duration despite treatment with oral antibiotics and antipyretics. Further, enquiry did not yield any potentially explanatory clues to a diagnosis. Physical examination revealed only left axillary lymphadenopathy, but was otherwise unremarkable. A number of diagnosis included tuberculosis, malignancy, lymphoma, connective disease disorder and infective endocarditis. Further evaluation revealed severe anaemia due to iron deficiency which was supported with blood transfusion and oral iron supplementation...
March 28, 2018: BMJ Case Reports
Anne M Muehe, Ashok J Theruvath, Lillian Lai, Maryam Aghighi, Andrew Quon, Samantha J Holdsworth, Jia Wang, Sandra Luna-Fineman, Neyssa Marina, Ranjana Advani, Jarrett Rosenberg, Heike E Daldrup-Link
PURPOSE: To provide clinically useful gadolinium-free whole-body cancer staging of children and young adults with integrated positron emission tomography/magnetic resonance (PET/MR) imaging in less than 1 h. PROCEDURES: In this prospective clinical trial, 20 children and young adults (11-30 years old, 6 male, 14 female) with solid tumors underwent 2-deoxy-2-[18 F]fluoro-D-glucose ([18 F]FDG) PET/MR on a 3T PET/MR scanner after intravenous injection of ferumoxytol (5 mg Fe/kg) and [18 F]FDG (2-3 MBq/kg)...
April 2018: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Sameer Sait, Neeta Pandit-Taskar, Shakeel Modak
123 I-meta-iodo benzyl guanidine (MIBG) scans are considered the gold standard imaging in neuroblastoma; however, flouro deoxy glucose positron emission tomography (FDG-PET) scans have increased sensitivity in adults with pheochromocytoma/paraganglioma. We describe a pediatric patient initially considered to have localized neuroblastoma based on anatomical imaging and123 I-MIBG scan, but subsequent investigations revealed germline succinate dehydrogenase complex iron sulfur subunit B (SDHB) mutation-associated pheochromocytoma with multiple FDG-avid skeletal metastases...
November 2017: Pediatric Blood & Cancer
Priyanka, Toshy Agrawal, Anil S Kotasthane, Ashok Kosharia, Renu Kushwah, Najam Waris Zaidi, U S Singh
Fluorescent Pseudomonas, aerobic, Gram-negative bacteria possess many traits that make them well suited as biocontrol and growth promoting agents. Our study revealed that isolates vary in mechanisms involved in the antagonist interactions against pathogen and growth stimulatory effects on host plant. Most of the potential antagonistic fluorescent Pseudomonas identified were avid iron chelators (P233, P201, 176, P76 and, P76). Wide variation in ACCd enzyme production was observed. ACCd enzyme assay tested P141 > P247 > P126, as potential ACCd enzyme producer...
May 2017: 3 Biotech
Ignacio Nevares, Víctor Martínez-Martínez, Ana Martínez-Gil, Roberto Martín, V Felipe Laurie, María Del Álamo-Sanza
Measuring the oxygen content during winemaking and bottle storage has become increasingly popular due to its impact on the sensory quality and longevity of wines. Nevertheless, only a few attempts to describe the kinetics of oxygen consumption based on the chemical composition of wines have been published. Therefore, this study proposes firstly a new fitting approach describing oxygen consuming kinetics and secondly the use of an Artificial Neural Network approach to describe and compare the oxygen avidity of wines according to their basic chemical composition (i...
August 15, 2017: Food Chemistry
Shweta Sharma, Venkata Ramana Kotamraju, Tarmo Mölder, Allan Tobi, Tambet Teesalu, Erkki Ruoslahti
Antiangiogenic and vascular disrupting compounds have shown promise in cancer therapy, but tend to be only partially effective. We previously reported a potent theranostic nanosystem that was highly effective in glioblastoma and breast cancer mouse models, retarding tumor growth and producing some cures [ Agemy , L. et al. Proc. Natl. Acad. Sci. U.S.A. 2011 , 108 , 17450 - 17455 . Agemy , L. et al. Mol. Ther. 2013 , 21 , 2195 - 2204 .]. The nanosystem consists of iron oxide NPs ("nanoworms") coated with a composite peptide with tumor-homing and pro-apoptotic domains...
March 8, 2017: Nano Letters
Jack C Penner, Jose A G Ferreira, Patrick R Secor, Johanna M Sweere, Maria K Birukova, Lydia-Marie Joubert, Janus A J Haagensen, Omar Garcia, Andrey V Malkovskiy, Gernot Kaber, Hasan Nazik, Robert Manasherob, Alfred M Spormann, Karl V Clemons, David A Stevens, Paul L Bollyky
Pseudomonas aeruginosa (Pa) and Aspergillus fumigatus (Af) are major human pathogens known to interact in a variety of disease settings, including airway infections in cystic fibrosis. We recently reported that clinical CF isolates of Pa inhibit the formation and growth of Af biofilms. Here, we report that the bacteriophage Pf4, produced by Pa, can inhibit the metabolic activity of Af biofilms. This phage-mediated inhibition was dose dependent, ablated by phage denaturation, and was more pronounced against preformed Af biofilm rather than biofilm formation...
September 2016: Microbiology
Val J Lowe, Geoffry Curran, Ping Fang, Amanda M Liesinger, Keith A Josephs, Joseph E Parisi, Kejal Kantarci, Bradley F Boeve, Mukesh K Pandey, Tyler Bruinsma, David S Knopman, David T Jones, Leonard Petrucelli, Casey N Cook, Neill R Graff-Radford, Dennis W Dickson, Ronald C Petersen, Clifford R Jack, Melissa E Murray
BACKGROUND: It is essential to determine the specificity of AV-1451 PET for tau in brain imaging by using pathological comparisons. We performed autoradiography in autopsy-confirmed Alzheimer disease and other neurodegenerative disorders to evaluate the specificity of AV-1451 binding for tau aggregates. METHODS: Tissue samples were selected that had a variety of dementia-related neuropathologies including Alzheimer disease, primary age-related tauopathy, tangle predominant dementia, non-Alzheimer disease tauopathies, frontotemporal dementia, parkinsonism, Lewy body disease and multiple system atrophy (n = 38)...
June 13, 2016: Acta Neuropathologica Communications
Richa Pandey, Reem Daloul, Daniel W Coyne
Iron deficiency is common in patients on chronic dialysis, and most require iron-replacement therapy. In addition to absolute iron deficiency, many patients have functional iron deficiency as shown by a suboptimal response to the use of erythropoietin-stimulating agents. Both absolute and functional iron-deficiency anemia have been shown to respond to intravenous (IV) iron replacement. Although parenteral iron is an efficacious method and superior to standard doses of oral iron in patients on hemodialysis, there are ongoing safety concerns about repeated exposure potentially enhancing infection risk and cardiovascular disease...
March 2016: Seminars in Nephrology
Nathaniel D Denkers, Davin M Henderson, Candace K Mathiason, Edward A Hoover
Prions have been demonstrated in body fluids and excreta using bioassay, but at levels too low for detection by conventional direct-detection assays. More rapid and sensitive detection of prions in these clinically accessible specimens would be valuable for diagnosis and investigations of transmission, environmental impact, and interventions. In addition to very low concentrations of prions, in vitro amplification assays are challenged by the presence of inhibitors in these complex sources. Here, we leverage the prion attribute of avid metal binding with the versatile power of real-time quaking-induced conversion (RT-QuIC) to enhance and simplify detection of chronic wasting-disease prions in biological samples...
August 2016: Journal of General Virology
Spencer C Behr, Rahul Aggarwal, Youngho Seo, Carina M Aparici, Emily Chang, Kenneth T Gao, Dora H Tao, Eric J Small, Michael J Evans
PURPOSE: The management of advanced or recurrent prostate cancer is limited in part by the lack of effective imaging agents. Metabolic changes in prostate cancer have previously been exploited for imaging, culminating in the recent US FDA approval of [11 C]choline for the detection of subclinical recurrent disease after definitive local therapy. Despite this milestone, production of [11 C]choline requires an on-site cyclotron, limiting the scope of medical centers at which this scan can be offered...
December 2016: Molecular Imaging and Biology: MIB: the Official Publication of the Academy of Molecular Imaging
Pauline L M Verhaegh, Wenke Moris, Ger H Koek, Cees Th B M van Deursen
OBJECTIVE: Phenotypes of the HFE-related haemochromatosis vary considerably, making it hard to predict the course of iron accumulation. The aim of this retrospective study was to determine if the Iron Avidity Index (IAI) is a good phenotypic predictor of the number of phlebotomies needed per year during maintenance treatment (NPDMT) in patients with homozygous p.C282Y hereditary haemochromatosis (HH). METHODS: Patients with HH homozygous for p.C282Y, on maintenance treatment for at least 1 year were included...
October 2016: Liver International: Official Journal of the International Association for the Study of the Liver
Danuta S Kalinowski, Christian Stefani, Shinya Toyokuni, Tomas Ganz, Gregory J Anderson, Nathan V Subramaniam, Debbie Trinder, John K Olynyk, Anita Chua, Patric J Jansson, Sumit Sahni, Darius J R Lane, Angelica M Merlot, Zaklina Kovacevic, Michael L H Huang, C Soon Lee, Des R Richardson
Essential metals, such as iron and copper, play a critical role in a plethora of cellular processes including cell growth and proliferation. However, concomitantly, excess of these metal ions in the body can have deleterious effects due to their ability to generate cytotoxic reactive oxygen species (ROS). Thus, the human body has evolved a very well-orchestrated metabolic system that keeps tight control on the levels of these metal ions. Considering their very high proliferation rate, cancer cells require a high abundance of these metals compared to their normal counterparts...
April 2016: Biochimica et Biophysica Acta
Swetha Inturi, Guankui Wang, Fangfang Chen, Nirmal K Banda, V Michael Holers, LinPing Wu, Seyed Moein Moghimi, Dmitri Simberg
Notwithstanding rapid advances of nanotechnology in diagnostic imaging and drug delivery, the engineered nanocarriers still exhibit substantial lack of hemocompatibility. Thus, when injected systemically, nanoparticles are avidly recognized by blood leukocytes and platelets, but the mechanisms of immune recognition are not well understood and strategies to mitigate these phenomena remain underexplored. Using superparamagnetic dextran iron oxide (SPIO) nanoworms (NWs) we demonstrate an efficient and predominantly complement-dependent uptake by mouse lymphocytes, neutrophils and monocytes from normal and tumor bearing mice in vitro...
November 24, 2015: ACS Nano
Daniele Barbaro, Lorenzo Di Bari, Valentina Gandin, Claudio Evangelisti, Giovanni Vitulli, Eleonora Schiavi, Cristina Marzano, Anna M Ferretti, Piero Salvadori
Iron oxide nanoparticles (IONP) can have a variety of biomedical applications due to their visualization properties through Magnetic Resonance Imaging (MRI) and heating with radio frequency or alternating magnetic fields. In the oncological field, coating IONP with organic compounds to provide specific features and to achieve the ability of binding specific molecular targets appears to be very promising. To take advantage of the high avidity of tumor cells for glucose, we report the development of very small glucose-coated IONP (glc-IONP) by employing an innovative technique, Metal Vapor Synthesis (MVS)...
2015: PloS One
Nashwa El-Gendy, Jian Qian, Kate Eshelman, Mario Rivera, Cory Berkland
Increasing antibiotic resistance has compelled the development of novel antibiotics and adjuvant therapies that enhance the efficacy of existing antibiotics. Iron plays a critical role in bacterial infections, yet the use of iron chelators as adjuvant therapy with antibiotics has yielded highly variable outcomes. Multivalent polymeric materials offer an alternative approach to bind and sequester iron via high avidity interactions. Here, a biomimetic iron-sequestering polymer (PAI-DHBA) was synthesized by modifying side chains of cross-linked polyallylamine (cPAI) with 2,3-dihydroxybenzoic acid (DHBA)...
May 11, 2015: Biomacromolecules
Jose R Infante, Manuel Moreno, Juan I Rayo, Justo Serrano, Maria L Dominguez, Lucia Garcia
Hereditary hemochromatosis is an autosomal recessive disorder of iron metabolism resulting in toxic accumulation of iron in vital organs. We present a 64-year-old white man with non-Hodgkin lymphoma treated with high-dose chemotherapy and stem cell transplant that was subsequently diagnosed with hereditary hemochromatosis. F-FDG PET/CT was performed as routine follow-up and showed a pathological finding of homogeneous increased liver glucose metabolism. Increased FDG avidity in the liver suggested the presence of damage caused by hemochromatosis...
June 2015: Clinical Nuclear Medicine
Stanford Guan, Tia Palermo, Jaymie Meliker
Although the benefits of fish consumption are widely recognized, seafood may also be a source of exposure to heavy metals such as cadmium. Many types of seafood are rich in cadmium, but bioavailability and potential for toxicity after consumption is less clear. This study investigates the relationship between seafood intake and the level of cadmium (Cd) in the blood in a 252 person cohort of avid seafood consumers in the Long Island Study of Seafood Consumption (New York). Blood cadmium is an established biomarker of cadmium exposure, reflecting both recent and decade-long exposure...
January 2015: International Journal of Hygiene and Environmental Health
Jin Hae Kim, Jameson R Bothe, Ronnie O Frederick, Johneisa C Holder, John L Markley
The Escherichia coli isc operon encodes key proteins involved in the biosynthesis of iron-sulfur (Fe-S) clusters. Whereas extensive studies of most ISC proteins have revealed their functional properties, the role of IscX (also dubbed YfhJ), a small acidic protein encoded by the last gene in the operon, has remained in question. Previous studies showed that IscX binds iron ions and interacts with the cysteine desulfurase (IscS) and the scaffold protein for cluster assembly (IscU), and it has been proposed that IscX functions either as an iron supplier or a regulator of Fe-S cluster biogenesis...
June 4, 2014: Journal of the American Chemical Society
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