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Rieg T, Xue J, Stevens M, Thomas L, White J, Dominguez Rieg J. Intravenous ferric carboxymaltose and ferric derisomaltose alter the intestinal microbiome in female iron-deficient anemic mice. Biosci Rep 2023; 43:BSR20231217. [PMID: 37671923 PMCID: PMC10520285 DOI: 10.1042/bsr20231217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2023] [Revised: 08/31/2023] [Accepted: 09/06/2023] [Indexed: 09/07/2023] Open
Abstract
Iron deficiency anemia (IDA) is a leading global health concern affecting approximately 30% of the population. Treatment for IDA consists of replenishment of iron stores, either by oral or intravenous (IV) supplementation. There is a complex bidirectional interplay between the gut microbiota, the host's iron status, and dietary iron availability. Dietary iron deficiency and supplementation can influence the gut microbiome; however, the effect of IV iron on the gut microbiome is unknown. We studied how commonly used IV iron preparations, ferric carboxymaltose (FCM) and ferric derisomaltose (FDI), affected the gut microbiome in female iron-deficient anemic mice. At the phylum level, vehicle-treated mice showed an expansion in Verrucomicrobia, mostly because of the increased abundance of Akkermansia muciniphila, along with contraction in Firmicutes, resulting in a lower Firmicutes/Bacteroidetes ratio (indicator of dysbiosis). Treatment with either FCM or FDI restored the microbiome such that Firmicutes and Bacteroidetes were the dominant phyla. Interestingly, the phyla Proteobacteria and several members of Bacteroidetes (e.g., Alistipes) were expanded in mice treated with FCM compared with those treated with FDI. In contrast, several Clostridia class members were expanded in mice treated with FDI compared with FCM (e.g., Dorea spp., Eubacterium). Our data demonstrate that IV iron increases gut microbiome diversity independently of the iron preparation used; however, differences exist between FCM and FDI treatments. In conclusion, replenishing iron stores with IV iron preparations in clinical conditions, such as inflammatory bowel disease or chronic kidney disease, could affect gut microbiome composition and consequently contribute to an altered disease outcome.
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Affiliation(s)
- Timo Rieg
- Department of Molecular Pharmacology and Physiology, Hypertension and Kidney Research Center, University of South Florida, Tampa, FL 33612, U.S.A
- James A. Haley Veterans’ Hospital, Tampa, FL 33612, U.S.A
| | - Jianxiang Xue
- Department of Molecular Pharmacology and Physiology, Hypertension and Kidney Research Center, University of South Florida, Tampa, FL 33612, U.S.A
| | - Monica Stevens
- Department of Molecular Pharmacology and Physiology, Hypertension and Kidney Research Center, University of South Florida, Tampa, FL 33612, U.S.A
| | - Linto Thomas
- Department of Molecular Pharmacology and Physiology, Hypertension and Kidney Research Center, University of South Florida, Tampa, FL 33612, U.S.A
| | | | - Jessica A. Dominguez Rieg
- Department of Molecular Pharmacology and Physiology, Hypertension and Kidney Research Center, University of South Florida, Tampa, FL 33612, U.S.A
- James A. Haley Veterans’ Hospital, Tampa, FL 33612, U.S.A
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2
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Dong Z, Liu S, Deng Q, Li G, Tang Y, Wu X, Wan D, Yin Y. Role of iron in host-microbiota interaction and its effects on intestinal mucosal growth and immune plasticity in a piglet model. SCIENCE CHINA. LIFE SCIENCES 2023; 66:2086-2098. [PMID: 37530911 DOI: 10.1007/s11427-022-2409-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 06/15/2023] [Indexed: 08/03/2023]
Abstract
Iron is an essential trace element for both the host and resident microbes in the gut. In this study, iron was administered orally and parenterally to anemic piglets to investigate the role of iron in host-microbiota interaction and its effects on intestinal mucosal growth and immune plasticity. We found that oral iron administration easily increased the abundance of Proteobacteria and Escherichia-Shigella, and decreased the abundance of Lactobacillus in the ileum. Furthermore, similar bacterial changes, namely an increase in Proteobacteria, Escherichia-Shigella, and Fusobacterium and a reduction in the Christensenellaceae_R-7_group, were observed in the colon of both iron-supplemented groups. Spearman's correlation analysis indicated that the changed Fusobacterium, Fusobacteria and Proteobacteria in the colon were positively correlated with hemoglobin, colon and spleen iron levels. Nevertheless, it was found that activated mTOR1 signaling, improved villous height and crypt depth in the ileum, enhanced immune communication, and increased protein expression of IL-22 and IL-10 in the colon of both iron-supplemented groups. In conclusion, the benefits of improved host iron outweigh the risks of altered gut microbiota for intestinal mucosal growth and immune regulation in treating iron deficiency anemia.
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Affiliation(s)
- Zhenglin Dong
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China
| | - Shuan Liu
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China
| | - Qingqing Deng
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, 410081, China
| | - Guanya Li
- Hunan International Joint Laboratory of Animal Intestinal Ecology and Health, Laboratory of Animal Nutrition and Human Health, College of Life Sciences, Hunan Normal University, Changsha, 410081, China
| | - Yulong Tang
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China
| | - Xin Wu
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China
| | - Dan Wan
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China.
| | - Yulong Yin
- Key Laboratory of Agro-Ecological Processes in Subtropical Region, Hunan Research Center of Livestock & Poultry Sciences, South-Central Experimental Station of Animal Nutrition and Feed Science in Ministry of Agriculture, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, 410125, China.
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3
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Sun B, Tan B, Zhang P, Huang T, Wei H, Li C, Yang W. Effects of hemoglobin extracted from Tegillarca granosa on the gut microbiota in iron deficiency anemia mice. Food Funct 2023; 14:7040-7052. [PMID: 37449470 DOI: 10.1039/d3fo00695f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Iron deficiency anemia (IDA) is a serious threat to the health of humans around the world. Tegillarca granosa (T. granosa) is considered as an excellent source of iron due to its abundant iron-binding protein hemoglobin. This study aimed to investigate the effects of hemoglobin from T. granosa on the gut microbiota and iron bioavailability in IDA mice. Compared to normal mice, IDA mice showed reduced microbiota diversity and altered relative abundance (reduced Muribaculaceae and increased Bacteroides). After 4 weeks of administration, hemoglobin restored the dysbiosis of the intestinal microbiota induced by IDA and decreased the Firmicutes/Bacteroidota ratio and the abundance of Proteobacteria. Analysis of the hemoglobin regeneration efficiency of mice treated with hemoglobin confirmed that hemoglobin exhibited high iron bioavailability, particularly at low-dose administration, suggesting that a small amount of hemoglobin from T. granosa markedly elevated the blood hemoglobin level in mice. These findings suggested that IDA could be alleviated by administration of hemoglobin with excellent iron bioavailability, and its therapeutic mechanism may be partially attributed to the regulation of the intestinal microbiota composition and relative abundance. These results indicated that T. granosa hemoglobin may be a promising iron supplement to treat IDA and promote the utilization of aquatic-derived proteins.
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Affiliation(s)
- Bolun Sun
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
| | - Beibei Tan
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
- School of Agriculture and Food, Faculty of Science, University of Melbourne, Australia
| | - Panxue Zhang
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
| | - Tao Huang
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315211, China
| | - Huamao Wei
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315211, China
| | - Chao Li
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315211, China
| | - Wenge Yang
- College of Food and Pharmaceutical Sciences, Ningbo University, 315211, China.
- Key Laboratory of Animal Protein Food Deep Processing Technology of Zhejiang Province, Ningbo University, Ningbo 315211, China
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4
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Huynh U, Zastrow ML. Metallobiology of Lactobacillaceae in the gut microbiome. J Inorg Biochem 2023; 238:112023. [PMID: 36270041 PMCID: PMC9888405 DOI: 10.1016/j.jinorgbio.2022.112023] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/26/2022] [Accepted: 10/03/2022] [Indexed: 11/21/2022]
Abstract
Lactobacillaceae are a diverse family of lactic acid bacteria found in the gut microbiota of humans and many animals. These bacteria exhibit beneficial effects on intestinal health, including modulating the immune system and providing protection against pathogens, and many species are frequently used as probiotics. Gut bacteria acquire essential metal ions, like iron, zinc, and manganese, through the host diet and changes to the levels of these metals are often linked to alterations in microbial community composition, susceptibility to infection, and gastrointestinal diseases. Lactobacillaceae are frequently among the organisms increased or decreased in abundance due to changes in metal availability, yet many of the molecular mechanisms underlying these changes have yet to be defined. Metal requirements and metallotransporters have been studied in some species of Lactobacillaceae, but few of the mechanisms used by these bacteria to respond to metal limitation or excess have been investigated. This review provides a current overview of these mechanisms and covers how iron, zinc, and manganese impact Lactobacillaceae in the gut microbiota with an emphasis on their biochemical roles, requirements, and homeostatic mechanisms in several species.
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Affiliation(s)
- Uyen Huynh
- Department of Chemistry, University of Houston, Houston, TX, USA
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5
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Mayneris-Perxachs J, Moreno-Navarrete JM, Fernández-Real JM. The role of iron in host-microbiota crosstalk and its effects on systemic glucose metabolism. Nat Rev Endocrinol 2022; 18:683-698. [PMID: 35986176 DOI: 10.1038/s41574-022-00721-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/01/2022] [Indexed: 11/09/2022]
Abstract
Iron is critical for the appearance and maintenance of life on Earth. Almost all organisms compete or cooperate for iron acquisition, demonstrating the importance of this essential element for the biological and physiological processes that are key for the preservation of metabolic homeostasis. In humans and other mammals, the bidirectional interactions between the bacterial component of the gut microbiota and the host for iron acquisition shape both host and microbiota metabolism. Bacterial functions influence host iron absorption, whereas the intake of iron, iron deficiency and iron excess in the host affect bacterial biodiversity, taxonomy and function, resulting in changes in bacterial virulence. These consequences of the host-microbial crosstalk affect systemic levels of iron, its storage in different tissues and host glucose metabolism. At the interface between the host and the microbiota, alterations in the host innate immune system and in circulating soluble factors that regulate iron (that is, hepcidin, lipocalin 2 and lactoferrin) are associated with metabolic disease. In fact, patients with obesity-associated metabolic dysfunction and insulin resistance exhibit dysregulation in iron homeostasis and alterations in their gut microbiota profile. From an evolutionary point of view, the pursuit of two important nutrients - glucose and iron - has probably driven human evolution towards the most efficient pathways and genes for human survival and health.
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Affiliation(s)
- Jordi Mayneris-Perxachs
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IDIBGI), Girona, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - José María Moreno-Navarrete
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IDIBGI), Girona, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain
| | - José Manuel Fernández-Real
- Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona (IDIBGI), Girona, Spain.
- CIBER Fisiopatología de la Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Madrid, Spain.
- Department of Medicine, Universitat de Girona, Girona, Spain.
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6
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Daou Y, Falabrègue M, Pourzand C, Peyssonnaux C, Edeas M. Host and microbiota derived extracellular vesicles: Crucial players in iron homeostasis. Front Med (Lausanne) 2022; 9:985141. [PMID: 36314015 PMCID: PMC9606470 DOI: 10.3389/fmed.2022.985141] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 09/26/2022] [Indexed: 11/23/2022] Open
Abstract
Iron is a double-edged sword. It is vital for all that’s living, yet its deficiency or overload can be fatal. In humans, iron homeostasis is tightly regulated at both cellular and systemic levels. Extracellular vesicles (EVs), now known as major players in cellular communication, potentially play an important role in regulating iron metabolism. The gut microbiota was also recently reported to impact the iron metabolism process and indirectly participate in regulating iron homeostasis, yet there is no proof of whether or not microbiota-derived EVs interfere in this relationship. In this review, we discuss the implication of EVs on iron metabolism and homeostasis. We elaborate on the blooming role of gut microbiota in iron homeostasis while focusing on the possible EVs contribution. We conclude that EVs are extensively involved in the complex iron metabolism process; they carry ferritin and express transferrin receptors. Bone marrow-derived EVs even induce hepcidin expression in β-thalassemia. The gut microbiota, in turn, affects iron homeostasis on the level of iron absorption and possibly macrophage iron recycling, with still no proof of the interference of EVs. This review is the first step toward understanding the multiplex iron metabolism process. Targeting extracellular vesicles and gut microbiota-derived extracellular vesicles will be a huge challenge to treat many diseases related to iron metabolism alteration.
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Affiliation(s)
- Yasmeen Daou
- International Society of Microbiota, Tokyo, Japan
| | - Marion Falabrègue
- INSERM, CNRS, Institut Cochin, Université de Paris, Paris, France,Laboratory of Excellence GR-Ex, Paris, France
| | - Charareh Pourzand
- Department of Life Sciences, University of Bath, Bath, United Kingdom,Medicines Development, Centre for Therapeutic Innovation, University of Bath, Bath, United Kingdom
| | - Carole Peyssonnaux
- INSERM, CNRS, Institut Cochin, Université de Paris, Paris, France,Laboratory of Excellence GR-Ex, Paris, France
| | - Marvin Edeas
- INSERM, CNRS, Institut Cochin, Université de Paris, Paris, France,Laboratory of Excellence GR-Ex, Paris, France,*Correspondence: Marvin Edeas,
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7
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Sriwichaiin S, Thiennimitr P, Thonusin C, Sarichai P, Buddhasiri S, Kumfu S, Nawara W, Kittichotirat W, Fucharoen S, Chattipakorn N, Chattipakorn SC. Deferiprone has less benefits on gut microbiota and metabolites in high iron-diet induced iron overload thalassemic mice than in iron overload wild-type mice: A preclinical study. Life Sci 2022; 307:120871. [PMID: 35952729 DOI: 10.1016/j.lfs.2022.120871] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 08/02/2022] [Accepted: 08/04/2022] [Indexed: 11/29/2022]
Abstract
AIMS This study aimed to investigate the changes in gut microbiota in iron-overload thalassemia and the roles of an iron chelator on gut dysbiosis/inflammation, and metabolites, including short-chain fatty acids (SCFAs) and trimethylamine N-oxide (TMAO). MAIN METHODS Adult male C57BL/6 mice both wild-type (WT: n = 15) and heterozygous β-thalassemia (BKO: n = 15) were fed on either a normal (ND: n = 5/group) or a high‑iron diet for four months (HFe: n = 10/group). HFe-treated WT and HFe-treated BKO groups were further subdivided into two subgroups and each subgroup given either vehicle (n = 5/subgroup) or deferiprone (n = 5/subgroup) during the last month. Gut microbiota profiles, gut barrier characteristics, levels of proinflammatory cytokines, and plasma SCFAs and TMAO were determined at the end of the study. KEY FINDINGS HFe-fed WT mice showed distinct gut microbiota profiles from those of ND-fed WT mice, whereas HFe-fed BKO mice showed slightly different gut microbiota profiles from ND-fed BKO. Gut inflammation and barrier disruption were found only in HFe-fed BKO mice, however, an increase in plasma TMAO levels and decreased levels of SCFAs were observed in both WT and BKO mice with HFe-feeding. Treatment with deferiprone, gut dysbiosis and disturbance of metabolites were attenuated in HFe-fed WT mice, but not in HFe-fed BKO mice. Increased Verrucomicrobia and Ruminococcaceae were associated with the beneficial effects of deferiprone. SIGNIFICANCE Iron-overload leads to gut dysbiosis/inflammation and disturbance of metabolites, and deferiprone alleviates those conditions more effectively in WT than in those that are thalassemic.
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Affiliation(s)
- Sirawit Sriwichaiin
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Cardiac Electrophysiology Unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Parameth Thiennimitr
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Chanisa Thonusin
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Cardiac Electrophysiology Unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Phinitphong Sarichai
- Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Songphon Buddhasiri
- Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Veterinary Bioscience and Veterinary Public Health, Faculty of Veterinary Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Sirinart Kumfu
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Cardiac Electrophysiology Unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Wichwara Nawara
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Weerayuth Kittichotirat
- Bioinformatics and Systems Biology Program, School of Bioresources and Technology and School of Information Technology, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand; Systems Biology and Bioinformatics Research Group, Pilot Plant Development and Training Institute, King Mongkut's University of Technology Thonburi, Bangkok 10150, Thailand
| | - Suthat Fucharoen
- Thalassemia Research Center, Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom 73170, Thailand
| | - Nipon Chattipakorn
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Cardiac Electrophysiology Unit, Department of Physiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
| | - Siriporn C Chattipakorn
- Center of Excellence in Cardiac Electrophysiology Research, Chiang Mai University, Chiang Mai 50200, Thailand; Neurophysiology Unit, Cardiac Electrophysiology Research and Training Center, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand; Department of Oral Biology and Diagnostic Sciences, Faculty of Dentistry, Chiang Mai University, Chiang Mai 50200, Thailand.
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8
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Barreto HC, Abreu B, Gordo I. Fluctuating selection on bacterial iron regulation in the mammalian gut. Curr Biol 2022; 32:3261-3275.e4. [PMID: 35793678 DOI: 10.1016/j.cub.2022.06.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2022] [Revised: 04/27/2022] [Accepted: 06/08/2022] [Indexed: 10/17/2022]
Abstract
Iron is critical in host-microbe interactions, and its availability is tightly regulated in the mammalian gut. Antibiotics and inflammation can perturb iron availability in the gut, which could alter host-microbe interactions. Here, we show that an adaptive allele of iscR, a major regulator of iron homeostasis of Escherichia coli, is under fluctuating selection in the mouse gut. In vivo competitions in immune-competent, immune-compromised, and germ-free mice reveal that the selective pressure on an iscR mutant E. coli is modulated by the presence of antibiotics, the microbiota, and the immune system. In vitro assays show that iron availability is an important mediator of the iscR allele fitness benefits or costs. We identify Lipocalin-2, a host's immune protein that prevents bacterial iron acquisition, as a major host mechanism underlying fluctuating selection of iscR. Our results provide a remarkable example of strong fluctuating selection acting on bacterial iron regulation in the mammalian gut.
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Affiliation(s)
- Hugo C Barreto
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal.
| | - Beatriz Abreu
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal
| | - Isabel Gordo
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, 2780-156 Oeiras, Portugal.
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9
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Si C, Zhou X, Deng J, Ye S, Kong L, Zhang B, Wang W. Role of ferroptosis in gastrointestinal tumors: From mechanisms to therapies. Cell Biol Int 2022; 46:997-1008. [PMID: 35476364 DOI: 10.1002/cbin.11804] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Revised: 02/16/2022] [Accepted: 03/24/2022] [Indexed: 01/01/2023]
Abstract
Ferroptosis is an iron-dependent nonapoptotic regulated cell death, which is mainly caused by an abnormal increase in lipid oxygen free radicals and an imbalance in redox homeostasis. Recently, ferroptosis has been shown to have implications in various gastrointestinal cancers, such as gastric carcinoma, hepatocellular carcinoma, and pancreatic cancer. This review summarises the latest research on ferroptosis, its mechanism of action, and its role in the progression of different gastrointestinal tumors to provide more information regarding the prevention and treatment of these tumors.
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Affiliation(s)
- Chenli Si
- The First Clinical Medical College, Wenzhou Medical University, Wenzhou, China
| | - Xiang Zhou
- Department of Breast Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jie Deng
- Key Laboratory of Diagnosis and Treatment of Severe Hepato-Pancreatic Diseases of Zhejiang Province, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, China
| | - Shijie Ye
- The First Clinical Medical College, Wenzhou Medical University, Wenzhou, China
| | - Lingming Kong
- The First Clinical Medical College, Wenzhou Medical University, Wenzhou, China
| | - Baofu Zhang
- The First Clinical Medical College, Wenzhou Medical University, Wenzhou, China
| | - Weiming Wang
- Department of Hepatopancreatobiliary Surgery, The First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, China
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10
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Huynh U, Qiao M, King J, Trinh B, Valdez J, Haq M, Zastrow ML. Differential Effects of Transition Metals on Growth and Metal Uptake for Two Distinct Lactobacillus Species. Microbiol Spectr 2022; 10:e0100621. [PMID: 35080431 PMCID: PMC8791193 DOI: 10.1128/spectrum.01006-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 12/23/2021] [Indexed: 12/12/2022] Open
Abstract
Lactobacillus is a genus of Gram-positive bacteria and comprises a major part of the lactic acid bacteria group that converts sugars to lactic acid. Lactobacillus species found in the gut microbiota are considered beneficial to human health and commonly used in probiotic formulations, but their molecular functions remain poorly defined. Microbes require metal ions for growth and function and must acquire them from the surrounding environment. Therefore, lactobacilli need to compete with other gut microbes for these nutrients, although their metal requirements are not well-understood. Indeed, the abundance of lactobacilli in the microbiota is frequently affected by dietary intake of essential metals like zinc, manganese, and iron, but few studies have investigated the role of metals, especially zinc, in the physiology and metabolism of Lactobacillus species. Here, we investigated metal uptake by quantifying total cellular metal contents and compared how transition metals affect the growth of two distinct Lactobacillus species, Lactobacillus plantarum ATCC 14917 and Lactobacillus acidophilus ATCC 4356. When grown in rich or metal-limited medium, both species took up more manganese, zinc, and iron compared with other transition metals measured. Distinct zinc-, manganese- and iron-dependent patterns were observed in the growth kinetics for these species and while certain levels of each metal promoted the growth kinetics of both Lactobacillus species, the effects depend significantly on the culture medium and growth conditions. IMPORTANCE The gastrointestinal tract contains trillions of microorganisms, which are central to human health. Lactobacilli are considered beneficial microbiota members and are often used in probiotics, but their molecular functions, and especially those which are metal-dependent, remain poorly defined. Abundance of lactobacilli in the microbiota is frequently affected by dietary intake of essential metals like manganese, zinc, and iron, but results are complex, sometimes contradictory, and poorly predictable. There is a significant need to understand how host diet and metabolism will affect the microbiota, given that changes in microbiota composition are linked with disease and infection. The significance of our research is in gaining insight to how metals distinctly affect individual Lactobacillus species, which could lead to novel therapeutics and improved medical treatment. Growth kinetics and quantification of metal contents highlights how distinct species can respond differently to varied metal availability and provide a foundation for future molecular and mechanistic studies.
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Affiliation(s)
- Uyen Huynh
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - Muxin Qiao
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - John King
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - Brittany Trinh
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - Juventino Valdez
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - Marium Haq
- Department of Chemistry, University of Houston, Houston, Texas, United States
| | - Melissa L. Zastrow
- Department of Chemistry, University of Houston, Houston, Texas, United States
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Effect of Lacticaseibacillus casei Zhang on iron status, immunity, and gut microbiota of mice fed with low-iron diet. J Funct Foods 2022. [DOI: 10.1016/j.jff.2021.104906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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12
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Rethinking IRPs/IRE system in neurodegenerative disorders: Looking beyond iron metabolism. Ageing Res Rev 2022; 73:101511. [PMID: 34767973 DOI: 10.1016/j.arr.2021.101511] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Revised: 10/21/2021] [Accepted: 11/04/2021] [Indexed: 12/11/2022]
Abstract
Iron regulatory proteins (IRPs) and iron regulatory element (IRE) systems are well known in the progression of neurodegenerative disorders by regulating iron related proteins. IRPs are also regulated by iron homeostasis. However, an increasing number of studies have suggested a close relationship between the IRPs/IRE system and non-iron-related neurodegenerative disorders. In this paper, we reviewed that the IRPs/IRE system is not only controlled by iron ions, but also regulated by such factors as post-translational modification, oxygen, nitric oxide (NO), heme, interleukin-1 (IL-1), and metal ions. In addition, by regulating the transcription of non-iron related proteins, the IRPs/IRE system functioned in oxidative metabolism, cell cycle regulation, abnormal proteins aggregation, and neuroinflammation. Finally, by emphasizing the multiple regulations of IRPs/IRE system and its potential relationship with non-iron metabolic neurodegenerative disorders, we provided new strategies for disease treatment targeting IRPs/IRE system.
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Khocht A, Orlich M, Paster B, Bellinger D, Lenoir L, Irani C, Fraser G. Cross-sectional comparisons of subgingival microbiome and gingival fluid inflammatory cytokines in periodontally healthy vegetarians versus non-vegetarians. J Periodontal Res 2021; 56:1079-1090. [PMID: 34449089 DOI: 10.1111/jre.12922] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/04/2021] [Indexed: 01/01/2023]
Abstract
BACKGROUND Vegetarian diets are known to reduce inflammation. The objective of this study was to test the hypothesis that reduced inflammation associated with a vegetarian diet would promote a more commensal subgingival bacterial profile. METHODS A total of 39 periodontally healthy subjects (PD ≤3 mm, bleeding on probing <10%) were enrolled. Dietary intake was assessed by a food frequency questionnaire. A comprehensive periodontal examination was performed. Gingival crevicular fluid (GCF) and subgingival plaque samples were collected. GCF samples were assessed for interleukin-1β, interleukin-6, interleukin-8, tumor necrosis factor-alpha, and interleukin-10. Plaque samples were analyzed for bacteria using 16S rDNA sequencing on an Illumina platform. GenBank database was used for taxonomy classification. RESULTS Twenty-three subjects were categorized as vegetarian and 16 non-vegetarians. Clinical periodontal measures and GCF cytokine levels were statistically comparable between the two groups. Measures of microbial richness and alpha diversity were also comparable between the two dietary groups. Vegetarians harbored higher levels of phyla associated with gingival health (Actinobacteria, and Proteobacteria). Two species known to be associated with periodontitis (Mogibacterium timidum and Veillonella rogosae) were prominent in non-vegetarians. Pearson's correlations between GCF inflammatory cytokines and microbial taxa differed between vegetarians and non-vegetarians. In vegetarians, the anti-inflammatory cytokine IL-10 positively correlated with two species known to be associated with periodontal health (Peptidiphaga sp. HMT183 and Rothia aeria). CONCLUSIONS Diet is directly and indirectly associated with the microbial composition of subgingival plaque. A vegetarian diet may promote a subgingival microbiota associated with periodontal health.
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Affiliation(s)
- Ahmed Khocht
- Department of Periodontics, School of Dentistry, Loma Linda University, Loma Linda, California, USA
| | - Michael Orlich
- Department of Preventive Medicine, School of Medicine, Loma Linda University, Loma Linda, California, USA.,School of Public Health, Loma Linda University, Loma Linda, California, USA
| | - Bruce Paster
- Forsyth Institute, Cambridge, Massachusetts, USA
| | - Denise Bellinger
- Department of Pathology and Human Anatomy, School of Medicine, Loma Linda University, Loma Linda, California, USA
| | - Leticia Lenoir
- Department of Periodontics, School of Dentistry, Loma Linda University, Loma Linda, California, USA
| | - Crissy Irani
- Institute for Community Partnerships, Loma Linda University Health, Loma Linda, California, USA
| | - Gary Fraser
- Department of Preventive Medicine, School of Medicine, Loma Linda University, Loma Linda, California, USA.,School of Public Health, Loma Linda University, Loma Linda, California, USA
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Nutritional immunity: the impact of metals on lung immune cells and the airway microbiome during chronic respiratory disease. Respir Res 2021; 22:133. [PMID: 33926483 PMCID: PMC8082489 DOI: 10.1186/s12931-021-01722-y] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 04/15/2021] [Indexed: 12/15/2022] Open
Abstract
Nutritional immunity is the sequestration of bioavailable trace metals such as iron, zinc and copper by the host to limit pathogenicity by invading microorganisms. As one of the most conserved activities of the innate immune system, limiting the availability of free trace metals by cells of the immune system serves not only to conceal these vital nutrients from invading bacteria but also operates to tightly regulate host immune cell responses and function. In the setting of chronic lung disease, the regulation of trace metals by the host is often disrupted, leading to the altered availability of these nutrients to commensal and invading opportunistic pathogenic microbes. Similarly, alterations in the uptake, secretion, turnover and redox activity of these vitally important metals has significant repercussions for immune cell function including the response to and resolution of infection. This review will discuss the intricate role of nutritional immunity in host immune cells of the lung and how changes in this fundamental process as a result of chronic lung disease may alter the airway microbiome, disease progression and the response to infection.
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15
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Hereditary hemochromatosis promotes colitis and colon cancer and causes bacterial dysbiosis in mice. Biochem J 2021; 477:3867-3883. [PMID: 32955078 PMCID: PMC7557149 DOI: 10.1042/bcj20200392] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 09/17/2020] [Accepted: 09/21/2020] [Indexed: 12/24/2022]
Abstract
Hereditary hemochromatosis (HH), an iron-overload disease, is a prevalent genetic disorder. As excess iron causes a multitude of metabolic disturbances, we postulated that iron overload in HH disrupts colonic homeostasis and colon–microbiome interaction and exacerbates the development and progression of colonic inflammation and colon cancer. To test this hypothesis, we examined the progression and severity of colitis and colon cancer in a mouse model of HH (Hfe−/−), and evaluated the potential contributing factors. We found that experimentally induced colitis and colon cancer progressed more robustly in Hfe−/− mice than in wild-type mice. The underlying causes were multifactorial. Hfe−/− colons were leakier with lower proliferation capacity of crypt cells, which impaired wound healing and amplified inflammation-driven tissue injury. The host/microflora axis was also disrupted. Sequencing of fecal 16S RNA revealed profound changes in the colonic microbiome in Hfe−/− mice in favor of the pathogenic bacteria belonging to phyla Proteobacteria and TM7. There was an increased number of bacteria adhered onto the mucosal surface of the colonic epithelium in Hfe−/− mice than in wild-type mice. Furthermore, the expression of innate antimicrobial peptides, the first-line of defense against bacteria, was lower in Hfe−/− mouse colon than in wild-type mouse colon; the release of pro-inflammatory cytokines upon inflammatory stimuli was also greater in Hfe−/− mouse colon than in wild-type mouse colon. These data provide evidence that excess iron accumulation in colonic tissue as happens in HH promotes colitis and colon cancer, accompanied with bacterial dysbiosis and loss of function of the intestinal/colonic barrier.
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16
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He H, Teng H, Huang Q, He D, An F, Chen L, Song H. Beneficial effects of AOS-iron supplementation on intestinal structure and microbiota in IDA rats. FOOD SCIENCE AND HUMAN WELLNESS 2021. [DOI: 10.1016/j.fshw.2020.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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17
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Fillebeen C, Lam NH, Chow S, Botta A, Sweeney G, Pantopoulos K. Regulatory Connections between Iron and Glucose Metabolism. Int J Mol Sci 2020; 21:ijms21207773. [PMID: 33096618 PMCID: PMC7589414 DOI: 10.3390/ijms21207773] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/07/2020] [Accepted: 10/16/2020] [Indexed: 02/06/2023] Open
Abstract
Iron is essential for energy metabolism, and states of iron deficiency or excess are detrimental for organisms and cells. Therefore, iron and carbohydrate metabolism are tightly regulated. Serum iron and glucose levels are subjected to hormonal regulation by hepcidin and insulin, respectively. Hepcidin is a liver-derived peptide hormone that inactivates the iron exporter ferroportin in target cells, thereby limiting iron efflux to the bloodstream. Insulin is a protein hormone secreted from pancreatic β-cells that stimulates glucose uptake and metabolism via insulin receptor signaling. There is increasing evidence that systemic, but also cellular iron and glucose metabolic pathways are interconnected. This review article presents relevant data derived primarily from mouse models and biochemical studies. In addition, it discusses iron and glucose metabolism in the context of human disease.
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Affiliation(s)
- Carine Fillebeen
- Lady Davis Institute for Medical Research, Jewish General Hospital and Department of Medicine, McGill University, Montreal, QC H3Y 1P3, Canada;
| | - Nhat Hung Lam
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada; (N.H.L.); (S.C.); (A.B.); (G.S.)
| | - Samantha Chow
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada; (N.H.L.); (S.C.); (A.B.); (G.S.)
| | - Amy Botta
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada; (N.H.L.); (S.C.); (A.B.); (G.S.)
| | - Gary Sweeney
- Department of Biology, York University, Toronto, ON M3J 1P3, Canada; (N.H.L.); (S.C.); (A.B.); (G.S.)
| | - Kostas Pantopoulos
- Lady Davis Institute for Medical Research, Jewish General Hospital and Department of Medicine, McGill University, Montreal, QC H3Y 1P3, Canada;
- Correspondence: ; Tel.: +1-514-340-8260 (ext. 25293)
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18
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Nairz M, Weiss G. Iron in infection and immunity. Mol Aspects Med 2020; 75:100864. [PMID: 32461004 DOI: 10.1016/j.mam.2020.100864] [Citation(s) in RCA: 150] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Revised: 04/25/2020] [Accepted: 05/05/2020] [Indexed: 12/12/2022]
Abstract
Iron is an essential micronutrient for virtually all living cells. In infectious diseases, both invading pathogens and mammalian cells including those of the immune system require iron to sustain their function, metabolism and proliferation. On the one hand, microbial iron uptake is linked to the virulence of most human pathogens. On the other hand, the sequestration of iron from bacteria and other microorganisms is an efficient strategy of host defense in line with the principles of 'nutritional immunity'. In an acute infection, host-driven iron withdrawal inhibits the growth of pathogens. Chronic immune activation due to persistent infection, autoimmune disease or malignancy however, sequesters iron not only from infectious agents, autoreactive lymphocytes and neoplastic cells but also from erythroid progenitors. This is one of the key mechanisms which collectively result in the anemia of chronic inflammation. In this review, we highlight the most important interconnections between iron metabolism and immunity, focusing on host defense against relevant infections and on the clinical consequences of anemia of inflammation.
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Affiliation(s)
- Manfred Nairz
- Department of Internal Medicine II, Infectious Diseases, Immunology, Rheumatology, Pneumology, Medical University of Innsbruck, Austria
| | - Günter Weiss
- Department of Internal Medicine II, Infectious Diseases, Immunology, Rheumatology, Pneumology, Medical University of Innsbruck, Austria; Christian Doppler Laboratory for Iron Metabolism and Anemia Research, Medical University of Innsbruck, Austria.
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19
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Abstract
Iron supplementation and fortification are used to treat iron deficiency, which is often associated with gastrointestinal conditions, such as inflammatory bowel disease and colorectal cancer. Within the gut, commensal bacteria contribute to maintaining systemic iron homeostasis. Disturbances that lead to excess iron promote the replication and virulence of enteric pathogens. Consequently, research has been interested in better understanding the effects of iron supplementation and fortification on gut bacterial composition and overall gut health. While animal and human trials have shown seemingly conflicting results, these studies emphasize how numerous factors influence gut microbial composition. Understanding how different iron formulations and doses impact specific bacteria will improve the outcomes of iron supplementation and fortification in humans. Furthermore, discerning the nuances of iron supplementation and fortification will benefit subpopulations that currently do not respond well to treatment.
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20
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Patients developing inflammatory bowel disease have iron deficiency and lower plasma ferritin years before diagnosis: a nested case-control study. Eur J Gastroenterol Hepatol 2020; 32:1147-1153. [PMID: 32541236 PMCID: PMC7423531 DOI: 10.1097/meg.0000000000001816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
BACKGROUND Iron deficiency is common among inflammatory bowel disease (IBD) patients, generally reported without comparisons with controls. The aim of this study was to analyse if iron deficiency was more common among those later developing IBD compared to matched controls in a prospective setting. METHODS We included 96 healthy subjects later developing IBD and 191 matched controls from the Northern Sweden Health and Disease Study. We analysed iron, ferritin, transferrin, and calculated transferrin saturation in plasma sampled at least 1 year prior to IBD diagnosis. Iron deficiency was defined as plasma ferritin <30 µg/L if C-reactive protein (CRP) was <3 mg/L. When CRP was >3 mg/L, iron deficiency could not be excluded if ferritin was <100 µg/L. RESULTS Iron deficiency could not be excluded among more male cases vs controls (25.0% vs 2.2%; P < 0.001), whereas with no differences for women (39.6% vs 35.3%; P = 0.538). Ferritin was lower among male IBD cases (P = 0.001) and for ulcerative colitis (P = 0.016 for males and 0.017 for females), but not for Crohn's disease. Ferritin was associated with a lower risk for IBD and in the ulcerative colitis subgroup when using sex-based z-scores. Ferritin quartiles 2-4 had a 65% lower odds ratio for all IBD, ulcerative colitis, and Crohn's disease in multivariable analysis. CONCLUSIONS Lower ferritin was associated with higher risk for developing IBD in a prospective setting. Iron deficiency was more common among healthy males years later developing IBD compared to matched controls, but not among women.
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21
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Rusu IG, Suharoschi R, Vodnar DC, Pop CR, Socaci SA, Vulturar R, Istrati M, Moroșan I, Fărcaș AC, Kerezsi AD, Mureșan CI, Pop OL. Iron Supplementation Influence on the Gut Microbiota and Probiotic Intake Effect in Iron Deficiency-A Literature-Based Review. Nutrients 2020; 12:E1993. [PMID: 32635533 PMCID: PMC7400826 DOI: 10.3390/nu12071993] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/30/2020] [Accepted: 07/01/2020] [Indexed: 12/15/2022] Open
Abstract
Iron deficiency in the human body is a global issue with an impact on more than two billion individuals worldwide. The most important functions ensured by adequate amounts of iron in the body are related to transport and storage of oxygen, electron transfer, mediation of oxidation-reduction reactions, synthesis of hormones, the replication of DNA, cell cycle restoration and control, fixation of nitrogen, and antioxidant effects. In the case of iron deficiency, even marginal insufficiencies may impair the proper functionality of the human body. On the other hand, an excess in iron concentration has a major impact on the gut microbiota composition. There are several non-genetic causes that lead to iron deficiencies, and thus, several approaches in their treatment. The most common methods are related to food fortifications and supplements. In this review, following a summary of iron metabolism and its health implications, we analyzed the scientific literature for the influence of iron fortification and supplementation on the gut microbiome and the effect of probiotics, prebiotics, and/or synbiotics in iron absorption and availability for the organism.
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Affiliation(s)
- Ioana Gabriela Rusu
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Ramona Suharoschi
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Dan Cristian Vodnar
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Carmen Rodica Pop
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Sonia Ancuța Socaci
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Romana Vulturar
- Department of Molecular Sciences, University of Medicine and Pharmacy Iuliu Hatieganu, 400349 Cluj-Napoca, Romania;
- Cognitive Neuroscience Laboratory, University Babes-Bolyai, 400327 Cluj-Napoca, Romania
| | - Magdalena Istrati
- Regional Institute of Gastroenterology and Hepatology “Prof. Dr. Octavian Fodor”, 400158 Cluj-Napoca, Romania;
| | - Ioana Moroșan
- Faculty of Medicine, University of Medicine and Pharmacy “Iuliu Hatieganu”, 400349 Cluj-Napoca, Romania;
| | - Anca Corina Fărcaș
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Andreea Diana Kerezsi
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Carmen Ioana Mureșan
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
| | - Oana Lelia Pop
- Department of Food Science, University of Agricultural Science and Veterinary Medicine, 400372 Cluj-Napoca, Romania; (I.G.R.); (R.S.); (D.C.V.); (C.R.P.); (S.A.S.); (A.C.F.); (A.D.K.); (C.I.M.)
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22
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Oh CK, Moon Y. Dietary and Sentinel Factors Leading to Hemochromatosis. Nutrients 2019; 11:nu11051047. [PMID: 31083351 PMCID: PMC6566178 DOI: 10.3390/nu11051047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 04/29/2019] [Accepted: 05/07/2019] [Indexed: 02/06/2023] Open
Abstract
Although hereditary hemochromatosis is associated with the mutation of genes involved in iron transport and metabolism, secondary hemochromatosis is due to external factors, such as intended or unintended iron overload, hemolysis-linked iron exposure or other stress-impaired iron metabolism. The present review addresses diet-linked etiologies of hemochromatosis and their pathogenesis in the network of genes and nutrients. Although the mechanistic association to diet-linked etiologies can be complicated, the stress sentinels are pivotally involved in the pathological processes of secondary hemochromatosis in response to iron excess and other external stresses. Moreover, the mutations in these sentineling pathway-linked genes increase susceptibility to secondary hemochromatosis. Thus, the crosstalk between nutrients and genes would verify the complex procedures in the clinical outcomes of secondary hemochromatosis and chronic complications, such as malignancy. All of this evidence provides crucial insights into comprehensive clinical or nutritional interventions for hemochromatosis.
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Affiliation(s)
- Chang-Kyu Oh
- Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences, Pusan National University, Yangsan 50612, Korea.
| | - Yuseok Moon
- Laboratory of Mucosal Exposome and Biomodulation, Department of Biomedical Sciences, Pusan National University, Yangsan 50612, Korea.
- BioMedical Research Institute, Pusan National University, Yangsan 50612, Korea.
- Program of Food Health Sciences, Busan 46241, Korea.
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Blanco-Rojo R, Vaquero MP. Iron bioavailability from food fortification to precision nutrition. A review. INNOV FOOD SCI EMERG 2019. [DOI: 10.1016/j.ifset.2018.04.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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24
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Muleviciene A, D’Amico F, Turroni S, Candela M, Jankauskiene A. Iron deficiency anemia-related gut microbiota dysbiosis in infants and young children: A pilot study. Acta Microbiol Immunol Hung 2018; 65:551-564. [PMID: 30418043 DOI: 10.1556/030.65.2018.045] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Nutritional iron deficiency (ID) causes not only anemia but also malfunction of the entire human organism. Recently, a role of the gut microbiota has been hypothesized, but limited data are available especially in infants. Here, we performed a pilot study to explore the gut microbiota in 10 patients with iron deficiency anemia (IDA) and 10 healthy controls aged 6-34 months. Fresh stool samples were collected from diapers, and the fecal microbiota was profiled by next-generation sequencing of the V3-V4 hypervariable region of the 16S rRNA gene. Except for diet diversity, the breastfeeding status at the enrollment, the exclusive breastfeeding duration, and the introduction of complementary foods did not differ between groups. Distinct microbial signatures were found in IDA patients, with increased relative abundance of Enterobacteriaceae (mean relative abundance, patients vs. controls, 4.4% vs. 3.0%) and Veillonellaceae (13.7% vs. 3.6%), and reduced abundance of Coriobacteriaceae (3.5% vs. 8.8%) compared to healthy controls. A decreased Bifidobacteriaceae/Enterobacteriaceae ratio was observed in IDA patients. Notwithstanding the low sample size, our data highlight microbiota dysbalance in IDA worth for further investigations, aimed at unraveling the ID impact on the microbiome trajectory in early life, and the possible long-term consequences.
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Affiliation(s)
- Audrone Muleviciene
- 1 Clinic of Children’s Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania
| | - Federica D’Amico
- 2 Unit of Microbial Ecology of Health, Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Silvia Turroni
- 2 Unit of Microbial Ecology of Health, Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Marco Candela
- 2 Unit of Microbial Ecology of Health, Department of Pharmacy and Biotechnology, University of Bologna, Bologna, Italy
| | - Augustina Jankauskiene
- 1 Clinic of Children’s Diseases, Institute of Clinical Medicine, Faculty of Medicine, Vilnius University, Vilnius, Lithuania
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Boyer E, Le Gall-David S, Martin B, Fong SB, Loréal O, Deugnier Y, Bonnaure-Mallet M, Meuric V. Increased transferrin saturation is associated with subgingival microbiota dysbiosis and severe periodontitis in genetic haemochromatosis. Sci Rep 2018; 8:15532. [PMID: 30341355 PMCID: PMC6195524 DOI: 10.1038/s41598-018-33813-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2018] [Accepted: 09/25/2018] [Indexed: 02/08/2023] Open
Abstract
Genetic haemochromatosis (GH) is responsible for iron overload. Increased transferrin saturation (TSAT) has been associated with severe periodontitis, which is a chronic inflammatory disease affecting tissues surrounding the teeth and is related to dysbiosis of the subgingival microbiota. Because iron is essential for bacterial pathogens, alterations in iron homeostasis can drive dysbiosis. To unravel the relationships between serum iron biomarkers and the subgingival microbiota, we analysed samples from 66 GH patients. The co-occurrence analysis of the microbiota showed very different patterns according to TSAT. Healthy and periopathogenic bacterial clusters were found to compete in patients with normal TSAT (≤45%). However, significant correlations were found between TSAT and the proportions of Porphyromonas and Treponema, which are two genera that contain well-known periopathogenic species. In patients with high TSAT, the bacterial clusters exhibited no mutual exclusion. Increased iron bioavailability worsened periodontitis and promoted periopathogenic bacteria, such as Treponema. The radical changes in host-bacteria relationships and bacterial co-occurrence patterns according to the TSAT level also suggested a shift in the bacterial iron supply from transferrin to NTBI when TSAT exceeded 45%. Taken together, these results indicate that iron bioavailability in biological fluids is part of the equilibrium between the host and its microbiota.
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Affiliation(s)
- Emile Boyer
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France.
- CHU de Rennes, Service d'Odontologie, Rennes, 35033, France.
| | - Sandrine Le Gall-David
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
| | - Bénédicte Martin
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
| | - Shao Bing Fong
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
| | - Olivier Loréal
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
| | - Yves Deugnier
- CHU de Rennes, Service des Maladies du Foie, Rennes, 35033, France
- CIC 1414, Inserm, Rennes, 35033, France
| | - Martine Bonnaure-Mallet
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
- CHU de Rennes, Service d'Odontologie, Rennes, 35033, France
| | - Vincent Meuric
- Univ Rennes, INSERM, INRA, CHU Rennes, Institut NuMeCan (Nutrition, Metabolism and Cancer), Rennes, F-35000, France
- CHU de Rennes, Service d'Odontologie, Rennes, 35033, France
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Gut Microbiota and Iron: The Crucial Actors in Health and Disease. Pharmaceuticals (Basel) 2018; 11:ph11040098. [PMID: 30301142 PMCID: PMC6315993 DOI: 10.3390/ph11040098] [Citation(s) in RCA: 158] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 09/30/2018] [Accepted: 10/02/2018] [Indexed: 02/07/2023] Open
Abstract
Iron (Fe) is a highly ample metal on planet earth (~35% of the Earth’s mass) and is particularly essential for most life forms, including from bacteria to mammals. Nonetheless, iron deficiency is highly prevalent in developing countries, and oral administration of this metal is so far the most effective treatment for human beings. Notably, the excessive amount of unabsorbed iron leave unappreciated side effects at the highly interactive host–microbe interface of the human gastrointestinal tract. Recent advances in elucidating the molecular basis of interactions between iron and gut microbiota shed new light(s) on the health and pathogenesis of intestinal inflammatory diseases. We here aim to present the dynamic modulation of intestinal microbiota by iron availability, and conversely, the influence on dietary iron absorption in the gut. The central part of this review is intended to summarize our current understanding about the effects of luminal iron on host–microbe interactions in the context of human health and disease.
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Colonetti K, Roesch LF, Schwartz IVD. The microbiome and inborn errors of metabolism: Why we should look carefully at their interplay? Genet Mol Biol 2018; 41:515-532. [PMID: 30235399 PMCID: PMC6136378 DOI: 10.1590/1678-4685-gmb-2017-0235] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 01/19/2018] [Indexed: 12/26/2022] Open
Abstract
Research into the influence of the microbiome on the human body has been shedding new light on diseases long known to be multifactorial, such as obesity, mood disorders, autism, and inflammatory bowel disease. Although inborn errors of metabolism (IEMs) are monogenic diseases, genotype alone is not enough to explain the wide phenotypic variability observed in patients with these conditions. Genetics and diet exert a strong influence on the microbiome, and diet is used (alone or as an adjuvant) in the treatment of many IEMs. This review will describe how the effects of the microbiome on the host can interfere with IEM phenotypes through interactions with organs such as the liver and brain, two of the structures most commonly affected by IEMs. The relationships between treatment strategies for some IEMs and the microbiome will also be addressed. Studies on the microbiome and its influence in individuals with IEMs are still incipient, but are of the utmost importance to elucidating the phenotypic variety observed in these conditions.
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Affiliation(s)
- Karina Colonetti
- Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Laboratory of Basic Research and Advanced Investigations in Neurosciences (BRAIN), Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
| | - Luiz Fernando Roesch
- Interdisciplinary Research Center on Biotechnology-CIP-Biotec, Universidade Federal do Pampa, Bagé, RS, Brazil
| | - Ida Vanessa Doederlein Schwartz
- Programa de Pós-Graduação em Genética e Biologia Molecular, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
- Laboratory of Basic Research and Advanced Investigations in Neurosciences (BRAIN), Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
- Medical Genetics Service, Hospital de Clínicas de Porto Alegre, Porto Alegre, RS, Brazil
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Abstract
Enterococci are important human commensals and significant opportunistic pathogens. Biofilm-related enterococcal infections, such as endocarditis, urinary tract infections, wound and surgical site infections, and medical device-associated infections, often become chronic upon the formation of biofilm. The biofilm matrix establishes properties that distinguish this state from free-living bacterial cells and increase tolerance to antimicrobial interventions. The metabolic versatility of the enterococci is reflected in the diversity and complexity of environments and communities in which they thrive. Understanding metabolic factors governing colonization and persistence in different host niches can reveal factors influencing the transition to biofilm pathogenicity. Here, we report a form of iron-dependent metabolism for Enterococcus faecalis where, in the absence of heme, extracellular electron transfer (EET) and increased ATP production augment biofilm growth. We observe alterations in biofilm matrix depth and composition during iron-augmented biofilm growth. We show that the ldh gene encoding l-lactate dehydrogenase is required for iron-augmented energy production and biofilm formation and promotes EET. Bacterial metabolic versatility can often influence the outcome of host-pathogen interactions, yet causes of metabolic shifts are difficult to resolve. The bacterial biofilm matrix provides the structural and functional support that distinguishes this state from free-living bacterial cells. Here, we show that the biofilm matrix can immobilize iron, providing access to this growth-promoting resource which is otherwise inaccessible in the planktonic state. Our data show that in the absence of heme, Enterococcus faecalisl-lactate dehydrogenase promotes EET and uses matrix-associated iron to carry out EET. Therefore, the presence of iron within the biofilm matrix leads to enhanced biofilm growth.
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Iron and the Breastfed Infant. Antioxidants (Basel) 2018; 7:antiox7040054. [PMID: 29642400 PMCID: PMC5946120 DOI: 10.3390/antiox7040054] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 03/31/2018] [Accepted: 04/04/2018] [Indexed: 12/21/2022] Open
Abstract
The first 6 months of life is a crucial time in meeting iron needs. The purpose of this review is to examine iron in mother’s milk and whether or not it meets the physiological needs of the growing infant. Key issues include iron content and iron transport from the mammary gland as well as when and what foods should be added to the solely breastfed infant. We examine these topics in light of new molecular biology findings in the mammary gland.
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Mamouei Z, Zeng G, Wang YM, Wang Y. Candida albicanspossess a highly versatile and dynamic high-affinity iron transport system important for its commensal-pathogenic lifestyle. Mol Microbiol 2017; 106:986-998. [DOI: 10.1111/mmi.13864] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/11/2017] [Indexed: 02/02/2023]
Affiliation(s)
- Zeinab Mamouei
- Multi-Modal Molecular (M3) Biology; Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research; Singapore
| | - Guisheng Zeng
- Multi-Modal Molecular (M3) Biology; Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research; Singapore
| | - Yan-Ming Wang
- Multi-Modal Molecular (M3) Biology; Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research; Singapore
| | - Yue Wang
- Multi-Modal Molecular (M3) Biology; Institute of Molecular and Cell Biology, Agency for Science, Technology, and Research; Singapore
- Department of Biochemistry, Yong Loo Lin School of Medicine; National University of Singapore; Singapore
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Fernández Real JM, Moreno-Navarrete JM, Manco M. Iron influences on the Gut-Brain axis and development of type 2 diabetes. Crit Rev Food Sci Nutr 2017; 59:443-449. [DOI: 10.1080/10408398.2017.1376616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- José Manuel Fernández Real
- University Hospital of Girona ‘Dr JosepTrueta’, Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona IdibGi
- CIBER Fisiopatología de la Obesidad y Nutrición, Girona, Spain
| | - José Maria Moreno-Navarrete
- University Hospital of Girona ‘Dr JosepTrueta’, Department of Diabetes, Endocrinology and Nutrition, Institut d'Investigació Biomèdica de Girona IdibGi
- CIBER Fisiopatología de la Obesidad y Nutrición, Girona, Spain
| | - Melania Manco
- Research Area for multifactorial diseases, Bambino Gesù Children's Hospital and Research Institute, Research Unit for Multifactorial Disease, Rome, Italy
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Rocha ER, Krykunivsky AS. Anaerobic utilization of Fe(III)-xenosiderophores among Bacteroides species and the distinct assimilation of Fe(III)-ferrichrome by Bacteroides fragilis within the genus. Microbiologyopen 2017; 6:e00479. [PMID: 28397401 PMCID: PMC5552952 DOI: 10.1002/mbo3.479] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Revised: 02/24/2017] [Accepted: 03/07/2017] [Indexed: 01/01/2023] Open
Abstract
In this study, we show that Bacteroides species utilize Fe(III)-xenosiderophores as the only source of exogenous iron to support growth under iron-limiting conditions in vitro anaerobically. Bacteroides fragilis was the only species able to utilize Fe(III)-ferrichrome while Bacteroides vulgatus ATCC 8482 and Bacteroides thetaiotaomicron VPI 5482 were able to utilize both Fe(III)-enterobactin and Fe(III)-salmochelin S4 as the only source of iron in a dose-dependent manner. We have investigated the way B. fragilis assimilates Fe(III)-ferrichrome as initial model to understand the utilization of xenosiderophores in anaerobes. B. fragilis contains two outer membrane TonB-dependent transporters (TBDTs), FchA1 and FchA2, which are homologues to Escherichia coli ferrichrome transporter FhuA. The disruption of fchA1 gene had only partial growth defect on Fe(III)-ferrichrome while the fchA2 mutant had no growth defect compared to the parent strain. The genetic complementation of fchA1 gene restored growth to parent strain levels indicating that it plays a role in Fe(III)-ferrichrome assimilation though we cannot rule out some functional overlap in transport systems as B. fragilis contains abundant TBDTs whose functions are yet not understood. However, the growth of B. fragilis on Fe(III)-ferrichrome was abolished in a feoAB mutant indicating that Fe(III)-ferrichrome transported into the periplasmic space was reduced in the periplasm releasing ferrous iron prior to transport through the FeoAB transport system. Moreover, the release of iron from the ferrichrome may be linked to the thiol redox system as the trxB deletion mutant was also unable to grow in the presence of Fe(III)-ferrichrome. The genetic complementation of feoAB and trxB mutants completely restored growth on Fe(III)-ferrichrome. Taken together, these findings show that Bacteroides species have developed mechanisms to utilize ferric iron bound to xenosiderophores under anaerobic growth conditions though the regulation and role in the biology of Bacteroides in the anaerobic intestinal environment remain to be understood.
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Affiliation(s)
- Edson R. Rocha
- Department of Microbiology and ImmunologyBrody School of MedicineEast Carolina UniversityGreenvilleNC
| | - Anna S. Krykunivsky
- Department of Microbiology and ImmunologyBrody School of MedicineEast Carolina UniversityGreenvilleNC
- Intern from the Undergraduate Research Internship Placement ProgramUniversity of the West of England (UWE)BristolUK
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Qasem W, Azad MB, Hossain Z, Azad E, Jorgensen S, Castillo San Juan S, Cai C, Khafipour E, Beta T, Roberts LJ, Friel J. Assessment of complementary feeding of Canadian infants: effects on microbiome & oxidative stress, a randomized controlled trial. BMC Pediatr 2017; 17:54. [PMID: 28196533 PMCID: PMC5310014 DOI: 10.1186/s12887-017-0805-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/28/2016] [Accepted: 02/06/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND The World Health Organization recommends exclusive breastfeeding until 6 months followed by introduction of iron-rich complementary foods (CFs). The aim of this study was to determine the impact of different iron-rich CFs on infant gut inflammation and microbiota. METHODS Eighty-seven exclusively breastfed infants were randomly assigned to receive one of the following as their first CF: iron-fortified cereal (Cer), iron-fortified cereal with fruit (Cer + Fr), or meat (M). Urine and stool samples were collected to assess reactive oxygen species (ROS) generation, gut microbiota and inflammation. RESULTS Fecal iron differed across feeding groups (p < 0.001); levels were highest in the Cer group and lowest in M group. A significant increase of fecal ROS formation (p < 0.002) after the introduction of CFs was observed, but did not differ across feeding groups. Fecal calprotectin increased within all groups after the introduction of CFs (p = 0.004). Gut microbiota richness increased after introduction of M or Cer + Fr. Regardless of feeding group, Coriobacteriaceae were positively correlated with ROS and Staphylococcaceae were negatively correlated with calprotectin. CONCLUSIONS Choice of first CF may influence gut inflammation and microbiota, potentially due to variations in iron absorption from different foods. Further research is warranted to fully characterize these associations and to establish implications for infant health. This study was registered in the ClinicalTrial.gov registry (Identifier No. NCT01790542 ). TRIAL REGISTRATION This study was registered in the ClinicalTrial.gov registry under the name "Assessment of Complementary Feeding of Canadian Infants" (Identifier No. NCT01790542 ) February 6, 2013.
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Affiliation(s)
- Wafaa Qasem
- Departement of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB Canada
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
| | - Meghan B. Azad
- Department of Pediatrics & Child Health, University of Manitoba, Winnipeg, MB Canada
- Children’s Hospital Research Institute of Manitoba, Winnipeg, MB Canada
| | - Zakir Hossain
- Departement of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB Canada
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
| | - Elnaz Azad
- Department of Animal Science, University of Manitoba, Winnipeg, MB Canada
| | - Sarah Jorgensen
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
| | - Sandra Castillo San Juan
- Departement of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB Canada
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
| | - Chenxi Cai
- Departement of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB Canada
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
| | - Ehsan Khafipour
- Children’s Hospital Research Institute of Manitoba, Winnipeg, MB Canada
- Department of Animal Science, University of Manitoba, Winnipeg, MB Canada
- Department of Medical Microbiology, University of Manitoba, Winnipeg, MB Canada
| | - Trust Beta
- Department of Food Science, University of Manitoba, Winnipeg, MB Canada
| | - L. Jackson Roberts
- Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN USA
| | - James Friel
- Departement of Human Nutritional Sciences, University of Manitoba, Winnipeg, MB Canada
- Richardson Centre for Functional Foods and Nutraceuticals, 196 Innovation drive, University of Manitoba, Winnipeg, MB Canada R3T 6C5
- Children’s Hospital Research Institute of Manitoba, Winnipeg, MB Canada
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Ng O. Iron, microbiota and colorectal cancer. Wien Med Wochenschr 2016; 166:431-436. [PMID: 27577249 DOI: 10.1007/s10354-016-0508-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 07/27/2016] [Indexed: 12/21/2022]
Abstract
Iron deficiency and anaemia are common in colorectal cancer. Replacement with oral or intravenous iron effectively treats this deficiency. However, mechanistic and population studies suggest that excess iron promotes colorectal carcinogenesis. Growing research into gut microbiota and dysbiosis suggests one explanation for this association. Iron is growth limiting for many pathogenic bacteria and may promote a shift in the ratio of pathogenic to protective bacteria. This may increase the toxic bacterial metabolites, promoting inflammation and carcinogenesis. This has important implications as we seek to correct anaemia in our patients.
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Affiliation(s)
- Oliver Ng
- Clinical Research Fellow, Queens Medical Centre, Nottingham Digestive Disease Centre, E Floor West Block, Derby Rd, NG7 2UH, Nottingham, UK.
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Deschemin JC, Noordine ML, Remot A, Willemetz A, Afif C, Canonne-Hergaux F, Langella P, Karim Z, Vaulont S, Thomas M, Nicolas G. The microbiota shifts the iron sensing of intestinal cells. FASEB J 2015; 30:252-61. [PMID: 26370847 DOI: 10.1096/fj.15-276840] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Accepted: 08/31/2015] [Indexed: 12/12/2022]
Abstract
The amount of iron in the diet directly influences the composition of the microbiota. Inversely, the effects of the microbiota on iron homeostasis have been little studied. So, we investigate whether the microbiota itself may alter host iron sensing. Duodenal cytochrome b and divalent metal transporter 1, involved in apical iron uptake, are 8- and 10-fold, respectively, more abundant in the duodenum of germ-free (GF) mice than in mice colonized with a microbiota. In contrast, the luminal exporter ferroportin is 2-fold less abundant in GF. The overall signature of microbiota on iron-related proteins is similar in the colon. The colonization does not modify systemic parameters as plasma transferrin saturation (20%), plasma ferritin (150 ng/L), and liver (85 µg/g) iron load. Commensal organisms (Bacteroides thetaiotaomicron VPI-5482 and Faecalibacterium prausnitzii A2-165) and a probiotic strain (Streptococcus thermophilus LMD-9) led to up to 12-fold induction of ferritin in colon. Our data suggest that the intestinal cells of GF mice are depleted of iron and that following colonization, the epithelial cells favor iron storage. This study is the first to demonstrate that gut microbes induce a specific iron-related protein signature, highlighting new aspects of the crosstalk between the microbiota and the intestinal epithelium.
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Affiliation(s)
- Jean-Christophe Deschemin
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Marie-Louise Noordine
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Aude Remot
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Alexandra Willemetz
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Clément Afif
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - François Canonne-Hergaux
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Philippe Langella
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Zoubida Karim
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Sophie Vaulont
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Muriel Thomas
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
| | - Gaël Nicolas
- *INSERM U1016, Institut Cochin, Paris, France; Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8104, Paris, France; Université Paris Descartes and Université Paris Diderot, site Bichat, Sorbonne Paris Cité, Paris, France; Laboratory of Excellence GR-Ex, Paris, France; Institut National de la Recherche Agronomique, AgroParisTech, and Commensal and Probiotics-Host Interactions Laboratory, Unité Mixte de Recherche 1319, Microbiologie de l'Alimentation au Service de la Santé, Jouy-en-Josas, France; **INSERM Unité 1043-Centre de Physiopathologie de Toulouse Purpan and Université de Toulouse, Université Paul Sabatier, Centre de Physiopathologie de Toulouse Purpan, Toulouse, France; Centre National de la Recherche Scientifique Unité 5282, Toulouse, France; and INSERM Unité 1149, Centre de Recherches sur l'Inflammation, Paris, France
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The detrimental effects of iron on the joint: a comparison between haemochromatosis and haemophilia. J Clin Pathol 2015; 68:592-600. [DOI: 10.1136/jclinpath-2015-202967] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 03/29/2015] [Indexed: 12/21/2022]
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Malhotra R, Olsson H. Immunology, genetics and microbiota in the COPD pathophysiology: potential scope for patient stratification. Expert Rev Respir Med 2015; 9:153-9. [DOI: 10.1586/17476348.2015.1000865] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Kortman GAM, Raffatellu M, Swinkels DW, Tjalsma H. Nutritional iron turned inside out: intestinal stress from a gut microbial perspective. FEMS Microbiol Rev 2014; 38:1202-34. [PMID: 25205464 DOI: 10.1111/1574-6976.12086] [Citation(s) in RCA: 168] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 08/27/2014] [Accepted: 08/29/2014] [Indexed: 12/16/2022] Open
Abstract
Iron is abundantly present on earth, essential for most microorganisms and crucial for human health. Human iron deficiency that is nevertheless highly prevalent in developing regions of the world can be effectively treated by oral iron administration. Accumulating evidence indicates that excess of unabsorbed iron that enters the colonic lumen causes unwanted side effects at the intestinal host-microbiota interface. The chemical properties of iron, the luminal environment and host iron withdrawal mechanisms, especially during inflammation, can turn the intestine in a rather stressful milieu. Certain pathogenic enteric bacteria can, however, deal with this stress at the expense of other members of the gut microbiota, while their virulence also seems to be stimulated in an iron-rich intestinal environment. This review covers the multifaceted aspects of nutritional iron stress with respect to growth, composition, metabolism and pathogenicity of the gut microbiota in relation to human health. We aim to present an unpreceded view on the dynamic effects and impact of oral iron administration on intestinal host-microbiota interactions to provide leads for future research and other applications.
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Affiliation(s)
- Guus A M Kortman
- Department of Laboratory Medicine, The Radboud Institute for Molecular Life Sciences (RIMLS) of the Radboud University Medical Center, Nijmegen, The Netherlands
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Yang J, Rose DJ. Long-term dietary pattern of fecal donor correlates with butyrate production and markers of protein fermentation during in vitro fecal fermentation. Nutr Res 2014; 34:749-59. [PMID: 25218569 DOI: 10.1016/j.nutres.2014.08.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Revised: 08/13/2014] [Accepted: 08/18/2014] [Indexed: 12/15/2022]
Abstract
Diet influences gut microbiota composition. Therefore, we hypothesized that diet would impact the extent of dietary fiber utilization and the types of metabolic end-products produced by the microbiota during in vitro fecal fermentation. By obtaining long-term dietary records from fecal donors, we aimed to determine the correlations between dietary intake variables and dietary fiber degradation and short-/branched-chain fatty acid (BCFA) and ammonia production during in vitro fecal fermentation. Eighteen subjects completed 1-year diet history questionnaires and provided fecal samples that were used for in vitro fermentation of a whole wheat substrate. The percentage of dietary fiber fermented was not correlated with nutrient intakes; however, butyrate production was correlated with fecal donor intake of many nutrients of which principal component analysis revealed were mostly contributed by grain-, nut-, and vegetable-based foods. Negative correlations were found for propionate with intake of total carbohydrate, added sugar, and sucrose and for ammonia and BCFA production with intake of unsaturated fats. Thus, our analysis did not support our first hypothesis: the percentage of dietary fiber fermented during in vitro fermentation was not correlated with dietary records. However, production of butyrate; BCFA; ammonia; and, to a lesser extent, propionate was correlated with the diet records of fecal donors, thus supporting our second hypothesis. These results suggest that diets high in plant-based foods and high in unsaturated fats are associated with microbial metabolism that is consistent with host health.
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Affiliation(s)
- Junyi Yang
- Department of Food Science & Technology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Devin J Rose
- Department of Food Science & Technology, University of Nebraska-Lincoln, Lincoln, NE, USA.
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Iron supplementation promotes gut microbiota metabolic activity but not colitis markers in human gut microbiota-associated rats. Br J Nutr 2014; 111:2135-45. [DOI: 10.1017/s000711451400021x] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The global prevalence of Fe deficiency is high and a common corrective strategy is oral Fe supplementation, which may affect the commensal gut microbiota and gastrointestinal health. The aim of the present study was to investigate the impact of different dietary Fe concentrations on the gut microbiota and gut health of rats inoculated with human faecal microbiota. Rats (8 weeks old, n 40) were divided into five (n 8 each) groups and fed diets differing only in Fe concentration during an Fe-depletion period (12 weeks) and an Fe-repletion period (4 weeks) as follows: (1) Fe-sufficient diet throughout the study period; (2) Fe-sufficient diet followed by 70 mg Fe/kg diet; (3) Fe-depleted diet throughout the study period; (4) Fe-depleted diet followed by 35 mg Fe/kg diet; (5) Fe-depleted diet followed by 70 mg Fe/kg diet. Faecal and caecal samples were analysed for gut microbiota composition (quantitative PCR and pyrosequencing) and bacterial metabolites (HPLC), and intestinal tissue samples were investigated histologically. Fe depletion did not significantly alter dominant populations of the gut microbiota and did not induce Fe-deficiency anaemia in the studied rats. Provision of the 35 mg Fe/kg diet after feeding an Fe-deficient diet significantly increased the abundance of dominant bacterial groups such as Bacteroides spp. and Clostridium cluster IV members compared with that of an Fe-deficient diet. Fe supplementation increased gut microbial butyrate concentration 6-fold compared with Fe depletion and did not affect histological colitis scores. The present results suggest that Fe supplementation enhances the concentration of beneficial gut microbiota metabolites and thus may contribute to gut health.
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Intestinal iron homeostasis and colon tumorigenesis. Nutrients 2013; 5:2333-51. [PMID: 23812305 PMCID: PMC3738976 DOI: 10.3390/nu5072333] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2013] [Revised: 05/29/2013] [Accepted: 06/07/2013] [Indexed: 12/16/2022] Open
Abstract
Colorectal cancer (CRC) is the third most common cause of cancer-related deaths in industrialized countries. Understanding the mechanisms of growth and progression of CRC is essential to improve treatment. Iron is an essential nutrient for cell growth. Iron overload caused by hereditary mutations or excess dietary iron uptake has been identified as a risk factor for CRC. Intestinal iron is tightly controlled by iron transporters that are responsible for iron uptake, distribution, and export. Dysregulation of intestinal iron transporters are observed in CRC and lead to iron accumulation in tumors. Intratumoral iron results in oxidative stress, lipid peroxidation, protein modification and DNA damage with consequent promotion of oncogene activation. In addition, excess iron in intestinal tumors may lead to increase in tumor-elicited inflammation and tumor growth. Limiting intratumoral iron through specifically chelating excess intestinal iron or modulating activities of iron transporter may be an attractive therapeutic target for CRC.
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Xu P, Li M, Zhang J, Zhang T. Correlation of intestinal microbiota with overweight and obesity in Kazakh school children. BMC Microbiol 2012. [PMID: 23190705 PMCID: PMC3543275 DOI: 10.1186/1471-2180-12-283] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND This study sought to investigate a possible correlation between the intestinal microbiota, Bacteroidetes and Firmicutes, and obesity in Kazakh school children, aged 7-13 (n = 175). RESULTS Obese subjects had significantly greater systolic blood pressure, waist and hip circumference, as well as HOMA-IR as compared to normal and overweight participants. In addition, Bacteroides copy number and Bact/Firm ratios were significantly lower in the obese group as compared to the normal and overweight groups (P < 0.0167). This difference is only significant in girls, but not in boys when stratified by gender. Furthermore, a negative correlation between BMI and Bacteroidetes copy number (r = -0.18, P = 0.017) as well as Bact/Firm (r = -0.22, P = 0.003) was observed. CONCLUSION An association between reduced gut Bacteroidetes and Bact/Firm ratio with obesity in female Kazakh children was identified. Further studies are necessary to elucidate the mechanism behind these changes as well as the value of determining their presence for predicting obesity.
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Affiliation(s)
- Peiru Xu
- Department of Pediatrics, First Affiliated Hospital of Xinjiang Medical University, Urumqi, Xinjiang Uyghur Autonomous Region, People's Republic of China.
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