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Okazaki Y. Iron from the gut: the role of divalent metal transporter 1. J Clin Biochem Nutr 2024; 74:1-8. [PMID: 38292117 PMCID: PMC10822759 DOI: 10.3164/jcbn.23-47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 10/10/2023] [Indexed: 02/01/2024] Open
Abstract
Mammalian cells contain thousands of metalloproteins and evolved systems to correctly incorporate metal cofactors into their designated sites. Among the transient metals in living cells, iron is the most abundant element that present as an iron sulfur cluster, mono- and dinuclear iron centers or heme for catalytic reactions. Iron homeostasis is tightly regulated by intestinal iron absorption in mammals owing to the lack of an iron excretive transport system, apart from superficial epithelial cell detachment and urinary outflow reabsorptive impairment. In mammals, the central site for iron absorption is in the duodenum, where the divalent metal transporter 1 is essential for iron uptake. The most notable manifestation of mutated divalent metal transporter 1 presents as iron deficiency anemia in humans. In contrast, the mutation of ferroportin, which exports iron, causes iron overload by either gain or loss of function. Furthermore, hepcidin secretion from the liver suppresses iron efflux by internalizing and degrading ferroportin; thus, the hepcidin/ferroportin axis is extensively investigated for its potential as a therapeutic target to treat iron overload. This review focuses on the divalent metal transporter 1-mediated intestinal iron uptake and hepcidin/ferroportin axis that regulate systemic iron homeostasis.
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Affiliation(s)
- Yasumasa Okazaki
- Department of Pathology and Biological Responses, Nagoya University Graduate School of Medicine, Showa-ku, Nagoya, Aichi 466-8550, Japan
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Cegarra L, Aguirre P, Nuñez MT, Gerdtzen ZP, Salgado JC. Calcium is a noncompetitive inhibitor of DMT1 on the intestinal iron absorption process: empirical evidence and mathematical modeling analysis. Am J Physiol Cell Physiol 2022; 323:C1791-C1806. [PMID: 36342159 DOI: 10.1152/ajpcell.00411.2022] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Iron absorption is a complex and highly controlled process where DMT1 transports nonheme iron through the brush-border membrane of enterocytes to the cytoplasm but does not transport alkaline-earth metals such as calcium. However, it has been proposed that high concentrations of calcium in the diet could reduce iron bioavailability. In this work, we investigate the effect of intracellular and extracellular calcium on iron uptake by Caco-2 cells, as determined by calcein fluorescence quenching. We found that extracellular calcium inhibits iron uptake by Caco-2 cells in a concentration-dependent manner. Chelation of intracellular calcium with BAPTA did not affect iron uptake, which indicates that the inhibitory effect of calcium is not exerted through intracellular calcium signaling. Kinetic studies performed, provided evidence that calcium acts as a reversible noncompetitive inhibitor of the iron transport activity of DMT1. Based on these experimental results, a mathematical model was developed that considers the dynamics of noncompetitive inhibition using a four-state mechanism to describe the inhibitory effect of calcium on the DMT1 iron transport process in intestinal cells. The model accurately predicts the calcein fluorescence quenching dynamics observed experimentally after an iron challenge. Therefore, the proposed model structure is capable of representing the inhibitory effect of extracellular calcium on DMT1-mediated iron entry into the cLIP of Caco-2 cells. Considering the range of calcium concentrations that can inhibit iron uptake, the possible inhibition of dietary calcium on intestinal iron uptake is discussed.
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Affiliation(s)
- Layimar Cegarra
- Laboratory of Process Modeling and Distributed Computing, Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago, Chile.,Mammalian Cell Culture Laboratory, Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago, Chile.,Centre for Biotechnology and Bioengineering, University of Chile, Santiago, Chile
| | - Pabla Aguirre
- Iron and Biology of Aging Laboratory, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Marco T Nuñez
- Iron and Biology of Aging Laboratory, Department of Biology, Faculty of Sciences, University of Chile, Santiago, Chile
| | - Ziomara P Gerdtzen
- Mammalian Cell Culture Laboratory, Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago, Chile.,Centre for Biotechnology and Bioengineering, University of Chile, Santiago, Chile.,Center of Interventional Medicine for Precision and Advanced Cellular Therapy, Santiago, Chile.,Millennium Nucleus Marine Agronomy of Seaweed Holobionts, Puerto Mont, Chile
| | - J Cristian Salgado
- Laboratory of Process Modeling and Distributed Computing, Department of Chemical Engineering, Biotechnology and Materials, University of Chile, Santiago, Chile.,Centre for Biotechnology and Bioengineering, University of Chile, Santiago, Chile
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Kawabata T. Iron-Induced Oxidative Stress in Human Diseases. Cells 2022; 11:cells11142152. [PMID: 35883594 PMCID: PMC9324531 DOI: 10.3390/cells11142152] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/30/2022] [Accepted: 07/04/2022] [Indexed: 11/16/2022] Open
Abstract
Iron is responsible for the regulation of several cell functions. However, iron ions are catalytic and dangerous for cells, so the cells sequester such redox-active irons in the transport and storage proteins. In systemic iron overload and local pathological conditions, redox-active iron increases in the human body and induces oxidative stress through the formation of reactive oxygen species. Non-transferrin bound iron is a candidate for the redox-active iron in extracellular space. Cells take iron by the uptake machinery such as transferrin receptor and divalent metal transporter 1. These irons are delivered to places where they are needed by poly(rC)-binding proteins 1/2 and excess irons are stored in ferritin or released out of the cell by ferroportin 1. We can imagine transit iron pool in the cell from iron import to the export. Since the iron in the transit pool is another candidate for the redox-active iron, the size of the pool may be kept minimally. When a large amount of iron enters cells and overflows the capacity of iron binding proteins, the iron behaves as a redox-active iron in the cell. This review focuses on redox-active iron in extracellular and intracellular spaces through a biophysical and chemical point of view.
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Affiliation(s)
- Teruyuki Kawabata
- Department of Applied Physics, Postgraduate School of Science, Okayama University of Science, Okayama 700-0005, Japan
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Yang Y, Wang Y, Guo L, Gao W, Tang TL, Yan M. Interaction between macrophages and ferroptosis. Cell Death Dis 2022; 13:355. [PMID: 35429990 PMCID: PMC9013379 DOI: 10.1038/s41419-022-04775-z] [Citation(s) in RCA: 98] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 03/17/2022] [Accepted: 03/25/2022] [Indexed: 02/06/2023]
Abstract
Abstract Ferroptosis, a newly discovered iron-dependent cell death pathway, is characterized by lipid peroxidation and GSH depletion mediated by iron metabolism and is morphologically, biologically and genetically different from other programmed cell deaths. Besides, ferroptosis is usually found accompanied by inflammatory reactions. So far, it has been found participating in the development of many kinds of diseases. Macrophages are a group of immune cells that widely exist in our body for host defense and play an important role in tissue homeostasis by mediating inflammation and regulating iron, lipid and amino acid metabolisms through their unique functions like phagocytosis and efferocytosis, cytokines secretion and ROS production under different polarization. According to these common points in ferroptosis characteristics and macrophages functions, it’s obvious that there must be relationship between macrophages and ferroptosis. Therefore, our review aims at revealing the interaction between macrophages and ferroptosis concerning three metabolisms and integrating the application of certain relationship in curing diseases, mostly cancer. Finally, we also provide inspirations for further studies in therapy for some diseases by targeting certain resident macrophages in distinct tissues to regulate ferroptosis. Facts Ferroptosis is considered as a newly discovered form characterized by its nonapoptotic and iron-dependent lipid hydroperoxide, concerning iron, lipid and amino acid metabolisms. Ferroptosis has been widely found playing a crucial part in various diseases, including hepatic diseases, neurological diseases, cancer, etc. Macrophages are phagocytic immune cells, widely existing and owning various functions such as phagocytosis and efferocytosis, cytokines secretion and ROS production. Macrophages are proved to participate in mediating metabolisms and initiating immune reactions to maintain balance in our body. Recent studies try to treat cancer by altering macrophages’ polarization which damages tumor microenvironment and induces ferroptosis of cancer cells.
Open questions How do macrophages regulate ferroptosis of other tissue cells specifically? Can we use the interaction between macrophages and ferroptosis in treating diseases other than cancer? What can we do to treat diseases related to ferroptosis by targeting macrophages? Is the use of the relationship between macrophages and ferroptosis more effective than other therapies when treating diseases?
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Affiliation(s)
- Yan Yang
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China
| | - Yu Wang
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China.,Xiangya School of Medicine, Central South University, Changsha, China
| | - Lin Guo
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China
| | - Wen Gao
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China.,Xiangya School of Medicine, Central South University, Changsha, China
| | - Ting-Li Tang
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China
| | - Miao Yan
- Department of Pharmacy, Second Xiangya Hospital, Central South University, Changsha, China.
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Tiekou Lorinczova H, Fitzsimons O, Mursaleen L, Renshaw D, Begum G, Zariwala MG. Co-Administration of Iron and a Bioavailable Curcumin Supplement Increases Serum BDNF Levels in Healthy Adults. Antioxidants (Basel) 2020; 9:E645. [PMID: 32707771 PMCID: PMC7463477 DOI: 10.3390/antiox9080645] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/09/2020] [Accepted: 07/16/2020] [Indexed: 12/19/2022] Open
Abstract
Brain-derived neurotrophic factor (BDNF) is key for the maintenance of normal neuronal function and energy homeostasis and has been suggested to improve cognitive function, including learning and memory. Iron and the antioxidant curcumin have been shown to influence BDNF homeostasis. This 6-week, double blind, randomized, placebo-controlled study examined the effects of oral iron supplementation at low (18 mg) and high (65 mg) ferrous (FS) iron dosages, compared to a combination of these iron doses with a bioavailable formulated form of curcumin (HydroCurcTM; 500 mg) on BDNF levels in a healthy adult cohort of 155 male (26.42 years ± 0.55) and female (25.82 years ± 0.54) participants. Participants were randomly allocated to five different treatment groups: both iron and curcumin placebo (FS0+Plac), low dose iron and curcumin placebo (FS18+Plac), low dose iron and curcumin (FS18+Curc), high dose iron and curcumin placebo (FS65+Plac) and high dose iron and curcumin (FS65+Curc). Results showed a significant increase in BDNF over time (26%) in the FS18+Curc group (p = 0.024), and at end-point between FS18+Curc and FS18+Plac groups (35%, p = 0.042), demonstrating for the first time that the combination with curcumin, rather than iron supplementation alone, results in increased serum BDNF. The addition of curcumin to iron supplementation may therefore provide a novel approach to further enhance the benefits associated with increased BDNF levels.
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Affiliation(s)
- Helena Tiekou Lorinczova
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London W1W 6UW, UK; (H.T.L.); (O.F.); (L.M.); (G.B.)
| | - Owen Fitzsimons
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London W1W 6UW, UK; (H.T.L.); (O.F.); (L.M.); (G.B.)
| | - Leah Mursaleen
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London W1W 6UW, UK; (H.T.L.); (O.F.); (L.M.); (G.B.)
- The Cure Parkinson’s Trust, 120 New Cavendish St, Fitzrovia, London W1W 6XX, UK
| | - Derek Renshaw
- Centre for Sport, Exercise and Life Sciences, Faculty of Health and Life Sciences, Coventry University, Priory St, Coventry CV1 5FB, UK;
| | - Gulshanara Begum
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London W1W 6UW, UK; (H.T.L.); (O.F.); (L.M.); (G.B.)
| | - Mohammed Gulrez Zariwala
- School of Life Sciences, University of Westminster, 115 New Cavendish Street, London W1W 6UW, UK; (H.T.L.); (O.F.); (L.M.); (G.B.)
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