scholarly journals The Ins and Outs of Iron Homeostasis

Physiology ◽  
2006 ◽  
Vol 21 (2) ◽  
pp. 115-123 ◽  
Author(s):  
Adriana Donovan ◽  
Cindy N. Roy ◽  
Nancy C. Andrews
Keyword(s):  
Iron Transport ◽  
Iron Homeostasis ◽  
Essential Element ◽  
Regulatory Mechanisms ◽  
Health And Disease ◽  
And Storage ◽  
Different Tissues

Iron is an essential element that is toxic when it accumulates in excess. Intricate regulatory mechanisms have evolved to maintain iron homeostasis within cells and between different tissues of complex organisms. This review discusses the proteins involved in iron transport and storage and their regulation in health and disease.

scholarly journals Dietary Selenium Regulates microRNAs in Metabolic Disease: Recent Progress

Nutrients ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 1527
Author(s):  
Xin Huang ◽  
Yu-Lan Dong ◽  
Tong Li ◽  
Wei Xiong ◽  
Xu Zhang ◽  
...  
Keyword(s):  
Physiological State ◽  
Essential Element ◽  
Dietary Factors ◽  
Regulatory Mechanisms ◽  
Metabolic Risk ◽  
Messenger Rnas ◽  
Immune Disorders ◽  
Se Deficiency ◽  
Safety Range ◽  
Se Status

Selenium (Se) is an essential element for the maintenance of a healthy physiological state. However, due to environmental and dietary factors and the narrow safety range of Se, diseases caused by Se deficiency or excess have gained considerable traction in recent years. In particular, links have been identified between low Se status, cognitive decline, immune disorders, and increased mortality, whereas excess Se increases metabolic risk. Considerable evidence has suggested microRNAs (miRNAs) regulate interactions between the environment (including the diet) and genes, and play important roles in several diseases, including cancer. MiRNAs target messenger RNAs to induce changes in proteins including selenoprotein expression, ultimately generating disease. While a plethora of data exists on the epigenetic regulation of other dietary factors, nutrient Se epigenetics and especially miRNA regulated mechanisms remain unclear. Thus, this review mainly focuses on Se metabolism, pathogenic mechanisms, and miRNAs as key regulatory factors in Se-related diseases. Finally, we attempt to clarify the regulatory mechanisms underpinning Se, miRNAs, selenoproteins, and Se-related diseases.

Novel mutation in ferroportin1 is associated with autosomal dominant hemochromatosis

Blood ◽  
2002 ◽  
Vol 100 (2) ◽  
pp. 692-694 ◽  
Author(s):  
Daniel F. Wallace ◽  
Palle Pedersen ◽  
Jeannette L. Dixon ◽  
Peter Stephenson ◽  
Jeffrey W. Searle ◽  
...  
Keyword(s):  
Iron Transport ◽  
Autosomal Recessive ◽  
Iron Homeostasis ◽  
Autosomal Dominant ◽  
Novel Mutation ◽  
Hfe Gene ◽  
Excess Iron ◽  
Chromosome 1Q ◽  
Australian Family ◽  
Autosomal Recessive Pattern

Abstract Hemochromatosis is a common disorder characterized by excess iron absorption and accumulation of iron in tissues. Usually hemochromatosis is inherited in an autosomal recessive pattern and is caused by mutations in the HFE gene. Less common non-HFE–related forms of hemochromatosis have been reported and are caused by mutations in the transferrin receptor 2 gene and in a gene localized to chromosome 1q. Autosomal dominant forms of hemochromatosis have also been described. Recently, 2 mutations in theferroportin1 gene, which encodes the iron transport protein ferroportin1, have been implicated in families with autosomal dominant hemochromatosis from the Netherlands and Italy. We report the finding of a novel mutation (V162del) in ferroportin1 in an Australian family with autosomal dominant hemochromatosis. We propose that this mutation disrupts the function of the ferroportin1 protein, leading to impaired iron homeostasis and iron overload.

scholarly journals Expression of the genes for the ferritin H and L subunits in rat liver and heart. Evidence for tissue-specific regulations at pre- and post-translational levels

1991 ◽  
Vol 275 (3) ◽  
pp. 813-816 ◽  
Author(s):  
G Cairo ◽  
E Rappocciolo ◽  
L Tacchini ◽  
L Schiaffonati
Keyword(s):  
Translational Regulation ◽  
Specific Pattern ◽  
Regulatory Mechanisms ◽  
Mrna Accumulation ◽  
Tissue Specific ◽  
Protein Levels ◽  
Ferritin Gene ◽  
Ferritin H ◽  
Translational Mechanisms ◽  
Different Tissues

The proportion of ferritin light-chain and heavy-chain subunits (L and H) present in the ferritin multimeric shell varies between different tissues. To identify the regulatory mechanisms responsible for the greater amount of L in liver than in heart isoferritins, we analysed ferritin-gene expression at the RNA and protein levels in these two tissues of the rat. In the heart the ratio between the amount of L and H, at the level both of synthesis and accumulation, is about 1 and is the same as the ratio between their respective mRNAs. In contrast, in the liver, the ratio between the L- and H-mRNAs is approx. 2 and cannot entirely explain the large predominance of L in isoferritins in this tissue. Since in the liver the L-mRNA is neither preferentially associated with polyribosomes nor translated more efficiently than its H- counterpart, it seems that the liver-specific isoferritin profile is determined by a combination of pre- and post-translational mechanisms, whereas in heart the post-translational regulation does not seem to be relevant and the tissue-specific pattern is determined at the level of mRNA accumulation.

scholarly journals The liver in regulation of iron homeostasis

2017 ◽  
Vol 313 (3) ◽  
pp. G157-G165 ◽  
Author(s):  
Gautam Rishi ◽  
V. Nathan Subramaniam
Keyword(s):  
Plasma Proteins ◽  
Iron Homeostasis ◽  
Vital Role ◽  
Regulatory Function ◽  
Hepatic Iron ◽  
Storage Site ◽  
Molecular Processes ◽  
Body Iron ◽  
Functionally Diverse ◽  
And Storage

The liver is one of the largest and most functionally diverse organs in the human body. In addition to roles in detoxification of xenobiotics, digestion, synthesis of important plasma proteins, gluconeogenesis, lipid metabolism, and storage, the liver also plays a significant role in iron homeostasis. Apart from being the storage site for excess body iron, it also plays a vital role in regulating the amount of iron released into the blood by enterocytes and macrophages. Since iron is essential for many important physiological and molecular processes, it increases the importance of liver in the proper functioning of the body’s metabolism. This hepatic iron-regulatory function can be attributed to the expression of many liver-specific or liver-enriched proteins, all of which play an important role in the regulation of iron homeostasis. This review focuses on these proteins and their known roles in the regulation of body iron metabolism.

Iron Transport and Metabolism in Escherichia, Shigella, and Salmonella

EcoSal Plus ◽  
2021 ◽  
Author(s):  
Alexandra R. Mey ◽  
Camilo Gómez-Garzón ◽  
Shelley M. Payne
Keyword(s):  
Iron Transport ◽  
Intestinal Tract ◽  
Essential Element ◽  
Content Type

Iron is an essential element for Escherichia , Salmonella , and Shigella species. The acquisition of sufficient amounts of iron is difficult in many environments, including the intestinal tract, where these bacteria usually reside.

Iron Homeostasis and Disorders in Dogs and Cats: A Review

2011 ◽  
Vol 47 (3) ◽  
pp. 151-160 ◽  
Author(s):  
Jennifer L. McCown ◽  
Andrew J. Specht
Keyword(s):  
Iron Deficiency ◽  
Iron Overload ◽  
Iron Homeostasis ◽  
Diagnostic Testing ◽  
Clinical Manifestations ◽  
Essential Element ◽  
The Body ◽  
Deficiency Anemia ◽  
Enzyme Systems ◽  
Living Organisms

Iron is an essential element for nearly all living organisms and disruption of iron homeostasis can lead to a number of clinical manifestations. Iron is used in the formation of both hemoglobin and myoglobin, as well as numerous enzyme systems of the body. Disorders of iron in the body include iron deficiency anemia, anemia of inflammatory disease, and iron overload. This article reviews normal iron metabolism, disease syndromes of iron imbalance, diagnostic testing, and treatment of either iron deficiency or excess. Recent advances in diagnosing iron deficiency using reticulocyte indices are reviewed.

scholarly journals Iron, Ferritin and Hepcidin Levels in Patients with Iron Deficiency Anemia

2021 ◽  
Vol 8 (5) ◽  
pp. 137-139
Author(s):  
Rabaa Khaled Abdel Salam ◽  
Saria Naji Mohsin
Keyword(s):  
Iron Deficiency ◽  
Iron Deficiency Anemia ◽  
Iron Transport ◽  
Blood Parameters ◽  
Deficiency Anemia ◽  
Control Group ◽  
Blood Picture ◽  
Cellular Kinetics ◽  
And Storage

This study was conducted to identify the role of some blood parameters, levels of some hormones, proteins, and cellular kinetics that have a role in iron transport and storage, in addition to their relationship with each other and with blood and sex parameters for patients with severe and moderate iron deficiency anemia, and to compare the parameters with healthy people. The study period lasted for the period from (December 2020 until March 2021) The presence of iron deficiency anemia was confirmed by examining the blood picture and the criteria of hepcidin and ferritin. The results showed a significant decrease in the in the concentration of hepcidin, ferritin and iron in patients compared to the control group.

Iron homeostasis: new tales from the crypt

Blood ◽  
2000 ◽  
Vol 96 (13) ◽  
pp. 4020-4027 ◽  
Author(s):  
Cindy N. Roy ◽  
Caroline A. Enns
Keyword(s):  
Iron Uptake ◽  
Iron Transport ◽  
Iron Homeostasis ◽  
Molecular Mechanisms ◽  
Hereditary Hemochromatosis ◽  
The Body ◽  
Regulatory Proteins ◽  
Iron Regulatory Proteins ◽  
Duodenal Epithelium ◽  
Related Proteins

Abstract The enterocyte is a highly specialized cell of the duodenal epithelium that coordinates iron uptake and transport into the body. Until recently, the molecular mechanisms underlying iron absorption and iron homeostasis have remained a mystery. This review focuses on the proteins and regulatory mechanisms known to be present in the enterocyte precursor cell and in the mature enterocyte. The recent cloning of a basolateral iron transporter and investigations into its regulation provide new insights into possible mechanisms for iron transport and homeostasis. The roles of proteins such as iron regulatory proteins, the hereditary hemochromatosis protein (HFE)–transferrin receptor complex, and hephaestin in regulating this transporter and in regulating iron transport across the intestinal epithelium are discussed. A speculative, but testable, model for the maintenance of iron homeostasis, which incorporates the changes in the iron-related proteins associated with the life cycle of the enterocyte as it journeys from the crypt to the tip of the villous is proposed.

scholarly journals Regulatory Mechanisms of Somatostatin Expression

2020 ◽  
Vol 21 (11) ◽  
pp. 4170 ◽  
Author(s):  
Emmanuel Ampofo ◽  
Lisa Nalbach ◽  
Michael D. Menger ◽  
Matthias W. Laschke
Keyword(s):  
Hormone Secretion ◽  
Growth Hormone Secretion ◽  
Peptide Hormone ◽  
Regulatory Mechanisms ◽  
Insulin Synthesis ◽  
The Central Nervous System ◽  
Health And Disease ◽  
Glucagon And Insulin ◽  
Somatostatin Expression

Somatostatin is a peptide hormone, which most commonly is produced by endocrine cells and the central nervous system. In mammals, somatostatin originates from pre-prosomatostatin and is processed to a shorter form, i.e., somatostatin-14, and a longer form, i.e., somatostatin-28. The two peptides repress growth hormone secretion and are involved in the regulation of glucagon and insulin synthesis in the pancreas. In recent years, the processing and secretion of somatostatin have been studied intensively. However, little attention has been paid to the regulatory mechanisms that control its expression. This review provides an up-to-date overview of these mechanisms. In particular, it focuses on the role of enhancers and silencers within the promoter region as well as on the binding of modulatory transcription factors to these elements. Moreover, it addresses extracellular factors, which trigger key signaling pathways, leading to an enhanced somatostatin expression in health and disease.

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