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Metallacyclosilanes of Calcium, Yttrium, and Iron.

Utilizing a choice of α,ω-oligosilanylene diides, it is possible to synthesize a number of heterocyclosilanes with heteroelements of calcium, yttrium, and iron by metathesis reactions with respective metal halides CaI2, YCl3, and FeBr2. 29Si NMR spectroscopic analysis of the calcacyclosilanes suggests that these compounds retain a strong oligosilanylene dianion character, which is more pronounced than in the analogous magnesacyclosilanes. As the electronegativity of calcium lies between potassium and magnesium, silyl calcium reagents should be considered as building blocks with an attractive r…

Role of iron in the treatment of sepsis.

Iron is an important microelement in human and microbial life activities. During the pathophysiological process of sepsis, iron metabolism changes and the body undergoes a series of changes to fight microbial infection. Meanwhile, alterations in iron metabolism during sepsis lead to the development of some diseases, such as transfusion-induced siderosis and anemia. In recent years, several studies have demonstrated the use of iron-chelating agents to fight microbial infections, and new antimicrobial agents have been developed using "Trojan horse" and siderophores immunity. In addition, the use…

Cancer: The role of iron and ferroptosis.

Iron is an essential element for virtually all living things. Body iron levels are tightly controlled as both increased iron levels and iron deficiency are associated with many clinical conditions. Increased iron levels are associated with a worse prognosis in some cancers, so understanding the role of iron in cancer development has thus been an active area of research. Regulated forms of cell death are important in development and disease pathogenesis. In this Medicine in Focus review article, we discuss the role of iron in cancer, and ferroptosis, a new form of iron-regulated cell death trig…

The battle for iron in enteric infections.

Iron is an essential element for almost all living organisms, but can be extremely toxic in high concentrations. All organisms must therefore employ homeostatic mechanisms to finely regulate iron uptake, usage and storage in the face of dynamic environmental conditions. The critical step in mammalian systemic iron homeostasis is the fine regulation of dietary iron absorption. However, as the gastrointestinal system is also home to >1014 bacteria, all of which engage in their own programmes of iron homeostasis, the gut represents an anatomical location where the inter-kingdom fight for iron is …

Iron in Neurodegeneration - Cause or Consequence?

Iron dyshomeostasis can cause neuronal damage to iron-sensitive brain regions. Neurodegeneration with brain iron accumulation reflects a group of disorders caused by iron overload in the basal ganglia. High iron levels and iron related pathogenic triggers have also been implicated in sporadic neurodegenerative diseases including Alzheimer's disease (AD), Parkinson's disease (PD), and multiple system atrophy (MSA). Iron-induced dyshomeostasis within vulnerable brain regions is still insufficiently understood. Here, we summarize the modes of action by which iron might act as primary or secondary…

Iron in Health and Disease: An Update.

Iron is an essential micronutrient for oxygen transport, cellular energy metabolism, and many enzymatic reactions. Complex physiological processes have evolved for iron acquisition to meet metabolic needs while avoiding toxicity from iron-generated free radicals. Systemic iron homeostasis is centered around the regulation of iron absorption from duodenum and iron release from stores by hepcidin. Intracellular iron is maintained under tight control by iron regulatory proteins acting at post-transcriptional level. Despite these elaborate mechanisms, iron status is frequently altered by environme…

Role of iron in neurodegenerative diseases.

Currently, we still lack effective measures to modify disease progression in neurodegenerative diseases. Iron-containing proteins play an essential role in many fundamental biological processes in the central nervous system. In addition, iron is a redox-active ion and can induce oxidative stress in the cell. Although the causes and pathology hallmarks of different neurodegenerative diseases vary, iron dyshomeostasis, oxidative stress and mitochondrial injury constitute a common pathway to cell death in several neurodegenerative diseases. MRI is capable of depicting iron content in the brain, a…

Iron and mechanisms of emotional behavior.

Iron is required for appropriate behavioral organization. Iron deficiency results in poor brain myelination and impaired monoamine metabolism. Glutamate and γ-aminobutyric acid homeostasis is modified by changes in brain iron status. Such changes produce not only deficits in memory/learning capacity and motor skills, but also emotional and psychological problems. An accumulating body of evidence indicates that both energy metabolism and neurotransmitter homeostasis influence emotional behavior, and both functions are influenced by brain iron status. Like other neurobehavioral aspects, the infl…

Iron homeostasis in the metabolic syndrome.

The metabolic syndrome (MetS) affects iron homeostasis in a many-faceted fashion. On the one side, hyperferritinaemia with normal or mildly elevated transferrin saturation is observed in approximately one-third of patients with non-alcoholic fatty liver disease (NAFLD) or the MetS. This constellation has been named the 'dysmetabolic iron overload syndrome (DIOS)'. Current evidence suggests that elevated body iron stores exert a detrimental effect on the clinical course of obesity-related conditions and that iron removal improves insulin sensitivity and delays the onset of T2DM. On the other si…

Iron and acetaminophen a fatal combination?

Intentional iron overdose in adults is uncommon. Clinical consequences are variable and depend on the quantity of iron ingested and the delay to treatment. Severe iron overdose can lead to multi-organ failure and acute hepatic necrosis. Here, we report three cases of polypharmacy overdose including iron resulting in acute liver failure. Despite maximum supportive care including liver transplantation in two cases, all patients died. Iron poisoning may have an additive toxic effect in drug-induced acute liver failure and worsen outcome.

Ferumoxytol for the treatment of iron deficiency.

Intravenous iron is standard for dialysis-associated anemia and its use is rising dramatically in other settings. Except for the dextrans, full iron replacement requires multiple visits. Nonetheless, safety concerns abound. Ferumoxytol, a recently approved modified dextran with a carbohydrate core that tightly binds the iron moiety, decreasing free iron and ostensibly increasing safety, was approved by the US FDA, in June 2009, for the treatment of iron deficiency associated with chronic kidney disease and end-stage renal disease. This formulation, uniquely, can be administered in a large dose…

The management of iron deficiency in menometrorrhagia.

Iron-deficiency anaemia, the condition in which anaemia occurs due to a lack of iron, develops when the amount of available iron is insufficient to support normal red blood cell production. Iron deficiency and iron-deficiency anaemia, very prevalent conditions in premenopausal women, are often associated with menometrorrhagia (present in more than two-thirds of cases of iron-deficiency anaemia in premenopausal women). Appropriate identification and treatment of iron deficiency is imperative as iron deficiency can induce important specific clinical manifestations (including fatigue, atrophic ch…

Iron and copper in fetal development.

Copper and iron are both essential micronutrients. Because they can both accept and donate electrons, they are central to many energy dependent chemical reactions. For example, copper is a critical part of ferroxidase enzymes ceruloplasmin, hephaestin and zyklopen, as well as enzymes such as dopamine-β-monoxygenase, while iron is part of the catalytic site of many cytochromes and enzymes involved in fatty acid desaturation. Unsurprisingly, therefore, copper and iron deficiency, especially during pregnancy, when cell proliferation and differentiation are very active, sub-optimal nutrient status…

Advances in iron chelation: an update.

INTRODUCTION: Oxidative stress (caused by excess iron) can result in tissue damage, organ failure and finally death, unless treated by iron chelators. The causative factor in the etiology of a variety of disease states is the presence of iron-generated reactive oxygen species (ROS), which can result in cell damage or which can affect the signaling pathways involved in cell necrosis-apoptosis or organ fibrosis, cancer, neurodegeneration and cardiovascular, hepatic or renal dysfunctions. Iron chelators can reduce oxidative stress by the removal of iron from target tissues. Equally as important, …

The role of iron in learning and memory.

Iron deficiency (ID) is the most common nutrient deficiency, affecting 2 billion people and 30% of pregnant women and their offspring. Early life ID affects at least 3 major neurobehavioral domains, including speed of processing, affect, and learning and memory, the latter being particularly prominent. The learning and memory deficits occur while the infants are iron deficient and persist despite iron repletion. The neural mechanisms underlying the short- and long-term deficits are being elucidated. Early ID alters the transcriptome, metabolome, structure, intracellular signaling pathways, and…

Iron and vascular calcification. Is there a link?

Iron deficiency is frequently seen in patients with end-stage renal disease, particularly in those treated by dialysis, this is because of an impairment in gastrointestinal absorption and ongoing blood losses or alternatively, due to an impaired capacity to mobilize iron from its stores, called functional iron deficiency. Therefore, these patients may require intravenous iron to sustain adequate treatment with erythropoietin-stimulating agents. Aside from this, they are also prone to vascular calcification, which has been reported a major contributing factor in the development of cardiovascula…

Hepcidin and disorders of iron metabolism.

The hepatic peptide hormone hepcidin is the principal regulator of iron absorption and its tissue distribution. Pathologically increased hepcidin concentrations cause or contribute to iron-restrictive anemias including anemias associated with inflammation, chronic kidney disease and some cancers. Hepcidin deficiency results in iron overload in hereditary hemochromatosis and ineffective erythropoiesis. The hepcidin-ferroportin axis is the principal regulator of extracellular iron homeostasis in health and disease, and is a promising target for the diagnosis and treatment of iron disorders and a…

Железо и нейродегенерация в множестве склерозов

Увеличение осаждения железа может быть связано с множественным склерозом (МС). Недавнее развитие МРТ позволило количественно определить уровни мозгового железа, что повысило интерес к изучению роли железа в MS. Данные об аномальном гомеостазе железа в MS также получены в результате анализа белков железа и железа в CSF, а также крови и послесмертных сеток мозга MS. Однако пока не ясно, связано ли накопление железа с патологией MS или просто отражает эпифеноменон. Дополнительный интерес вызвала идея хронической цереброспиновой недостаточности, которая может быть связана с накоплением мозгового ж

Совпадение в аннотации оригинала
Increased iron deposition might be implicated in multiple sclerosis (MS). Recent development of MRI enabled to determine brain iron levels in a quantitative manner, which has put more interest on studying the role of iron in MS. Evidence for abnormal iron homeostasis in MS comes also from analyses of iron and iron-related proteins in CSF and blood and postmo…

Iron and erythropoiesis: a dual relationship.

Iron is essential for cell life and especially for erythropoiesis which is the major body consumer of iron for red cell production. The study of genetic disorders of iron metabolism, the identification of iron transporters and of the role of hepcidin as the key regulator of systemic iron homeostasis have greatly contributed to our understanding of iron handling by the erythroid marrow. Spontaneous and engineered animal models of iron disorders have help to add further insights to the issue. A still incompletely understood aspect remains the regulation that erythropoiesis exerts on iron.