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Iron AND Transferrin

Avital Weiss, Lior Spektor, Lyora A Cohen, Lena Lifshitz, Inbar Magid Gold, De-Liang Zhang, Marianna Truman-Rosentsvit, Yael Leichtmann-Bardoogo, Abraham Nyska, Sefi Addadi, Tracey A Rouault, Esther G Meyron-Holtz
The exact route of iron through the kidney and its regulation during iron overload are not completely elucidated. Under physiologic conditions, non-transferrin and transferrin bound iron passes the glomerular filter and is reabsorbed through kidney epithelial cells, so that hardly any iron is found in the urine. To study the route of iron reabsorption through the kidney, we analyzed the location and regulation of iron metabolism related proteins in kidneys of mice with iron overload, elicited by iron dextran injections...
2018: PloS One
Neeraja Kunireddy, Rachel Jacob, Siraj Ahmed Khan, B Yadagiri, K S S Sai Baba, I Rajendra Vara Prasad, Iyyapu Krishna Mohan
Systemic Lupus Erythematosus is an autoimmune disease with female preponderance. Anemia is found in 50% of Systemic Lupus Erythematosus patients. This is a cross sectional case control study with 30 female Systemic Lupus Erythematosus patients having inflammation associated anemia (Hemoglobin < 10.0 gm/dl) and 30 age matched controls with the aim to measure serum hepcidin and ferritin levels, correlate and study their role as homeostatic regulators of iron metabolism and utility as markers. Serum transferrin, ferritin, iron, total iron binding capacity, hsCRP, liver enzymes and renal parameters were analyzed by using automated analyser...
October 2018: Indian Journal of Clinical Biochemistry: IJCB
Mitchell D Knutson
Most cells in the body acquire iron via receptor-mediated endocytosis of transferrin, the circulating iron transport protein. When cellular iron levels are sufficient, the uptake of transferrin decreases to limit further iron assimilation and prevent excessive iron accumulation. In iron overload conditions, such as hereditary hemochromatosis and thalassemia major, unregulated iron entry into the plasma overwhelms the carrying capacity of transferrin, resulting in non-transferrin-bound iron (NTBI), a redox-active, potentially toxic form of iron...
October 11, 2018: Free Radical Biology & Medicine
Junko Fujihara, Toshihiro Yasuda, Kaori Kimura-Kataoka, Haruo Takeshita
Iron is bound to mobile transferrin (TF) and ferritin in blood. TF receptors (TFRC and TFR2) regulate intracellular iron by delivering iron from TF into the cytoplasm. In this study, we examined the effects of 10 single nucleotide polymorphisms (SNPs) in each of the genes for TF and TF receptors on blood iron concentrations in Japanese subjects. Blood iron levels were determined by microwave plasma-atomic emission spectrometry and the SNPs were analyzed by polymerase chain reaction followed by restriction fragment length polymorphism analysis...
October 4, 2018: Legal Medicine
Shinya Toyokuni
Cancer is the primary cause of human mortality in most countries. This tendency has increased as various medical therapeutics have advanced, which suggests that we cannot escape carcinogenesis, although the final outcome may be modified by exposomes and statistics. Cancer is classified by its cellular differentiation. Mesothelial cells are distinct in that they line somatic cavities, facilitating the smooth movement of organs, but are not exposed to the external environment. Malignant mesothelioma, or simply mesothelioma, develops either in the pleural, peritoneal or pericardial cavities, or in the tunica vaginalis testes...
October 9, 2018: Free Radical Biology & Medicine
Theresa McDonagh, Thibaud Damy, Wolfram Doehner, Carolyn S P Lam, Andrew Sindone, Peter van der Meer, Alain Cohen-Solal, Ingrid Kindermann, Nicolas Manito, Otmar Pfister, Hanna Pohjantähti-Maaroos, Jackie Taylor, Josep Comin-Colet
Iron deficiency is common in patients with chronic heart failure (CHF) and is associated with reduced exercise performance, impaired health-related quality of life and an increased risk of mortality, irrespective of whether or not anaemia is present. Iron deficiency is a serious but treatable condition. Several randomized controlled clinical trials have demonstrated the ability of intravenous (IV) iron, primarily IV ferric carboxymaltose (FCM), to correct iron deficiency in patients with heart failure with reduced ejection fraction (HFrEF), resulting in improvements in exercise performance, CHF symptoms and health-related quality of life...
October 12, 2018: European Journal of Heart Failure
Raymond Pratt, Garry J Handelman, Thomas E Edwards, Ajay Gupta
There are several options available for intravenous application of iron supplements, but they all have a similar structure:-an iron core surrounded by a carbohydrate coating. These nanoparticles require processing by the reticuloendothelial system to release iron, which is subsequently picked up by the iron-binding protein transferrin and distributed throughout the body, with most of the iron supplied to the bone marrow. This process risks exposing cells and tissues to free iron, which is potentially toxic due to its high redox activity...
October 11, 2018: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
Iain C Macdougall, Claire White, Stefan D Anker, Sunil Bhandari, Kenneth Farrington, Philip A Kalra, John J V McMurray, Heather Murray, Retha Steenkamp, Charles R V Tomson, David C Wheeler, Christopher G Winearls, Ian Ford
BACKGROUND: Intravenous (IV) iron supplementation is a standard maintenance treatment for hemodialysis (HD) patients, but the optimum dosing regimen is unknown. METHODS: PIVOTAL (Proactive IV irOn Therapy in hemodiALysis patients) is a multicenter, open-label, blinded endpoint, randomized controlled (PROBE) trial. Incident HD adults with a serum ferritin < 400 µg/L and transferrin saturation (TSAT) levels < 30% receiving erythropoiesis-stimulating agents (ESA) were eligible...
October 10, 2018: American Journal of Nephrology
Wei Liang, Qin Li, Napoleone Ferrara
The tumor-promoting functions of neutrophils have been mainly attributed to induction of tumor angiogenesis or suppression of anticancer immunity. However, a direct impact of neutrophils on tumor cell growth and metastasis remains largely uncharacterized. Here, we coupled a proteomic approach with a functional screen to interrogate the secretome of tumor-associated neutrophils. Surprisingly, the iron-transporting protein transferrin was identified as the major mitogen for tumor cells secreted by neutrophils...
October 9, 2018: Proceedings of the National Academy of Sciences of the United States of America
Li Wang, Lian-Chun Huang, Yao-Yun Li, Qi-Rong Feng, Gui-Ping Liao, Jun-Hong Chen, Ya-Li Zhou, Tian-Hong Zhou, Xiao-Lin Yin
OBJECTIVE: To investigate the oxidative stress status and its effects on hepcidin in patients with hemoglobin H Constant Spring disease (HbH-CS). METHODS: A total of 35 patients were enrolled in the study, including 15 splenectomized cases and 20 non-splenectomized cases. 20 healthy volunteers were selected as controls. Serum superoxide dismutase (SOD), malondialdehyde (MDA), glutathione (GSH), oxidized glutathione (GSSG) levels, erythropoietin (EPO), serum free transferrin receptor (sFTR), growth differentiation factor 15 (GDF15) as well as the level of hepcidin were detected...
October 2018: Zhongguo Shi Yan Xue Ye Xue za Zhi
Andy K H Lim, Arushi Kansal, John Kanellis
BACKGROUND: Anaemia after kidney transplantation may reduce quality of life, graft or patient survival. We aimed to determine the prevalence and risk factors for anaemia in the initial 12 months after transplantation. METHODS: We conducted a cross-sectional study at 6 and 12 months after transplantation. Anaemia was defined by World Health Organization criteria taking into consideration erythropoietin use. Logistic regression was used to determine the association between demographic, clinical and pharmacological risk factors for the main outcome of moderate-severe anaemia...
October 5, 2018: BMC Nephrology
Aishatu Muhammad Nalado, Johnny N Mahlangu, Raquel Duarte, Graham Paget, Gbenga Olorunfemi, Barry F Jacobson, Saraladevi Naicker
INTRODUCTION: Iron deficiency anaemia (IDA) worsens the prognosis and outcomes of chronic kidney disease (CKD). However, while the haemoglobin level is unreliable for early detection of IDA, reticulocyte haemoglobin content (CHr) and hypochromic red cells (%HYPO) are early markers of IDA. METHODS: This was a cross sectional study of black adult participants (n = 258) with CKD and apparently healthy members of staff and patients' relatives (n = 141) at the Charlotte Maxeke Johannesburg Academic Hospital, South Africa, between 1 June 2016 and 31 December 2016...
2018: PloS One
Paul W Buehler, Elena Karnaukhova
PURPOSE OF REVIEW: After transfusion, a percentage of red blood cells undergo hemolysis within macrophages. Intravascular exposures to hemin and hemoglobin (Hb) can occur after storage bag hemolysis, some transfusion reactions, during use of medical assist devices and in response to bacterial hemolysins. Proteins that regulate iron, hemin and Hb either become saturated after iron excess (transferrin, Tf) or depleted after hemin (hemopexin, Hpx) and Hb (haptoglobin, Hp) excess. Protein saturation or stoichiometric imbalance created by transfusion increases exposure to non-Tf bound iron, hemin and Hb...
November 2018: Current Opinion in Hematology
Jose Joao Name, Andrea Rodrigues Vasconcelos, Cristina Valzachi Rocha Maluf
BACKGROUND: Iron deficiency anemia (IDA) is a major public health problem worldwide. Iron bisglycinate chelate (FeBC) and polymaltose iron (FeP) are used for the treatment of IDA and exhibit good tolerability with a low incidence of adverse effects. However, these compounds have important differences in their structures and bioavailability. OBJECTIVE: To compare the efficacy of oral supplementation with FeBC and FeP in anemic children. METHODS: In this double-blind study, children aged 1 to 13 years who were diagnosed with IDA were randomly divided into two groups: i) FeBC, supplemented with iron bisglycinate chelate, and ii) FeP, supplemented with polymaltose iron (3...
October 2, 2018: Current Pediatric Reviews
M Krijt, A Jirkovska, T Kabickova, V Melenovsky, J Petrak, D Vyoral
Dysregulated iron metabolism has a detrimental effect on cardiac function. The importance of iron homeostasis in cardiac health and disease warrants detailed studies of cardiomyocyte iron uptake, utilization and recycling at the molecular level. In this study, we have performed metabolic labeling of primary cultures of neonatal rat cardiomyocytes with radioactive iron coupled with separation of labeled iron-containing molecules by native electrophoresis followed by detection and quantification of incorporated radioiron by storage phosphorimaging...
September 10, 2018: Biochimica et biophysica acta. General subjects
Joanna Gajewska, Jadwiga Ambroszkiewicz, Witold Klemarczyk, Ewa Głąb-Jabłońska, Halina Weker, Magdalena Chełchowska
Iron metabolism may be disrupted in obesity, therefore, the present study assessed the iron status, especially ferroportin and hepcidin concentrations, as well as associations between the ferroportin-hepcidin axis and other iron markers in prepubertal obese children. The following were determined: serum ferroportin, hepcidin, ferritin, soluble transferrin receptor (sTfR), iron concentrations and values of hematological parameters as well as the daily dietary intake in 40 obese and 40 normal-weight children...
October 1, 2018: International Journal of Environmental Research and Public Health
Stefania Marzocco, Gholamreza Fazeli, Lucia Di Micco, Giuseppina Autore, Simona Adesso, Fabrizio Dal Piaz, August Heidland, Biagio Di Iorio
BACKGROUND: In end-stage renal disease (ESRD), gut-derived uremic toxins play a fundamental role in the systemic inflammation and oxidative stress promoting the excess morbidity and mortality. The biochemical derangement is in part a consequence of an insufficient generation of short-chain fatty acids (SCFA) due to the dysbiosis of the gut and an insufficient consumption of the fermentable complex carbohydrates. AIM OF THE STUDY: The primary end-point was to evaluate the potential efficacy of SCFA (specifically, sodium propionate (SP)) for patients on maintenance hemodialysis (MHD) on systemic inflammation...
September 30, 2018: Journal of Clinical Medicine
Fabiana Busti, Giacomo Marchi, Sara Ugolini, Annalisa Castagna, Domenico Girelli
Anemia in cancer patients is quite common, with remarkable negative impacts on quality of life and overall prognosis. The pathogenesis is complex and typically multifactorial, with iron deficiency (ID) often being a major and potentially treatable contributor. In turn, ID in cancer patients can be due to multiple concurring mechanisms, including bleeding (e.g., in gastrointestinal cancers or after surgery), malnutrition, medications, and hepcidin-driven iron sequestration into macrophages with subsequent iron-restricted erythropoiesis...
September 30, 2018: Pharmaceuticals
Manoj Saxena, Sergio A Loza-Rosas, Kavita Gaur, Shweta Sharma, Sofia C Pérez Otero, Arthur D Tinoco
Despite its natural abundance and widespread use as food, paint additive, and in bone implants, no specific biological function of titanium is known in the human body. High concentrations of Ti(IV) could result in cellular toxicity, however, the absence of Ti toxicity in the blood of patients with titanium bone implants indicates the presence of one or more biological mechanisms to mitigate toxicity. Similar to Fe(III), Ti(IV) in blood binds to the iron transport protein serum transferrin (sTf), which gives credence to the possibility of its cellular uptake mechanism by transferrin-directed endocytosis...
May 15, 2018: Coordination Chemistry Reviews
M J P Theelen, M Beukers, G C M Grinwis, M M Sloet van Oldruitenborgh-Oosterbaan
BACKGROUND: Iron toxicosis is rarely reported in horses and chronic excessive oral iron intake has not been reported to cause clinical symptoms in equids. OBJECTIVES: This case series describes 21 genetically unrelated horses and one donkey with chronic iron overload causing haemochromatosis and hepatopathy. STUDY DESIGN: Case series. METHODS: All equids showing clinical signs compatible with chronic liver disease presented to Utrecht University and diagnosed with iron overload and haemochromatosis based on histopathological evaluation of liver tissue and/or blood transferrin saturation levels of >80% and proof of excess dietary iron intake due to excess iron content in drinking water were included...
September 30, 2018: Equine Veterinary Journal
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