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Bourgon N, Tacail T, Jaouen K, Leichliter JN, McCormack J, Winkler DE, Clauss M, Tütken T. Dietary and homeostatic controls of Zn isotopes in rats: a controlled feeding experiment and modeling approach. Metallomics 2024; 16:mfae026. [PMID: 38755021 PMCID: PMC11157155 DOI: 10.1093/mtomcs/mfae026] [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: 01/08/2024] [Accepted: 05/15/2024] [Indexed: 05/18/2024]
Abstract
The stable isotope composition of zinc (δ66Zn), which is an essential trace metal for many biological processes in vertebrates, is increasingly used in ecological, archeological, and paleontological studies to assess diet and trophic level discrimination among vertebrates. However, the limited understanding of dietary controls and isotopic fractionation processes on Zn isotope variability in animal tissues and biofluids limits precise dietary reconstructions. The current study systematically investigates the dietary effects on Zn isotope composition in consumers using a combined controlled feeding experiment and box-modeling approach. For this purpose, 21 rats were fed one of seven distinct animal- and plant-based diets and a total of 148 samples including soft and hard tissue, biofluid, and excreta samples of these individuals were measured for δ66Zn. Relatively constant Zn isotope fractionation is observed across the different dietary groups for each tissue type, implying that diet is the main factor controlling consumer tissue δ66Zn values, independent of diet composition. Furthermore, a systematic δ66Zn diet-enamel fractionation is reported for the first time, enabling diet reconstruction based on δ66Zn values from tooth enamel. In addition, we investigated the dynamics of Zn isotope variability in the body using a box-modeling approach, providing a model of Zn isotope homeostasis and inferring residence times, while also further supporting the hypothesis that δ66Zn values of vertebrate tissues are primarily determined by that of the diet. Altogether this provides a solid foundation for refined (paleo)dietary reconstruction using Zn isotopes of vertebrate tissues.
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Affiliation(s)
- Nicolas Bourgon
- IsoTROPIC research group, Max Planck Institute for Geoanthropology, Kahlaische Str. 10, Jena, Germany
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, Germany
- Institute of Geosciences, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz, Germany
| | - Théo Tacail
- Institute of Geosciences, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz, Germany
| | - Klervia Jaouen
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, Germany
- Géosciences Environnement Toulouse, Observatoire Midi Pyrénées, 14 avenue Edouard Belin, Toulouse, France
| | - Jennifer N Leichliter
- Institute of Geosciences, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz, Germany
- HoMeCo Emmy Noether research group, Max Planck Institute for Chemistry, Hahn-Meitner-Weg 1, Mainz, Germany
| | - Jeremy McCormack
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Deutscher Platz 6, Leipzig, Germany
- Department of Geosciences, Goethe University Frankfurt, Altenhöferallee 1, Frankfurt, Germany
| | - Daniela E Winkler
- Institute of Geosciences, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz, Germany
- Zoology and Functional Morphology of Vertebrates, Zoological Institute, University Kiel, Am Botanischen Garten 3–9, Kiel, Germany
| | - Marcus Clauss
- Clinic for Zoo Animals, Exotic Pets and Wildlife, Vetsuisse Faculty, University of Zurich, Winterthurerstr. 260, Zurich, Switzerland
| | - Thomas Tütken
- Institute of Geosciences, Johannes Gutenberg University, Johann-Joachim-Becher-Weg 21, Mainz, Germany
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2
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Maret W. The quintessence of metallomics: a harbinger of a different life science based on the periodic table of the bioelements. Metallomics 2022; 14:mfac051. [PMID: 35820043 PMCID: PMC9406523 DOI: 10.1093/mtomcs/mfac051] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Accepted: 07/06/2022] [Indexed: 11/13/2022]
Abstract
This year marks the 20th anniversary of the field of metallomics. As a landmark in time, it is an occasion to reflect on the past, present, and future of this integrated field of biometal sciences. A fundamental bias is one reason for having metallomics as a scientific discipline. The focus of biochemistry on the six non-metal chemical elements, collectively known with the acronym SPONCH (sulphur, phosphorus, oxygen, nitrogen, carbon, hydrogen), glosses over the fact that the lower quantities of many other elements have qualities that made them instrumental in the evolution of life and pivotal in numerous life processes. The metallome, alongside the genome, proteome, lipidome, and glycome, should be regarded as a fifth pillar of elemental-vis-à-vis molecular-building blocks in biochemistry. Metallomics as 'global approaches to metals in the biosciences' considers the biological significance of most chemical elements in the periodic table, not only the ones essential for life, but also the non-essential ones that are present in living matter-some at higher concentrations than the essential ones. The non-essential elements are bioactive with either positive or negative effects. Integrating the significance of many more chemical elements into the life sciences requires a transformation in learning and teaching with a focus on elemental biology in addition to molecular biology. It should include the dynamic interactions between the biosphere and the geosphere and how the human footprint is changing the ecology globally and exposing us to many additional chemical elements that become new bioelements.
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Affiliation(s)
- Wolfgang Maret
- Metal Metabolism Group, Department of Nutritional Sciences, School of Life Course and Population Sciences, King's College London,London, UK
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3
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Rodiouchkina K, Rodushkin I, Goderis S, Vanhaecke F. Longitudinal isotope ratio variations in human hair and nails. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 808:152059. [PMID: 34863743 DOI: 10.1016/j.scitotenv.2021.152059] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 11/19/2021] [Accepted: 11/25/2021] [Indexed: 06/13/2023]
Abstract
Due to the straightforward and non-invasive sampling, ease of transport and long-term storage and access to time-resolved information, determination of element concentrations and isotope ratios in hair and nails finds increasing use. Multi-isotopic information preserved in keratinous tissues allows one to reveal dietary, physiological and environmental influences, but progress in this area is still limited by complicated and time-consuming analytical procedures and challenges in accuracy assessment. In this study, longitudinal distributions of δ34S, 87Sr/86Sr, 207,208Pb/206Pb, δ66Zn, δ56Fe, δ65Cu, δ26Mg, and δ114Cd were obtained for hair and nails collected from nine subjects with different age, biological sex, diet and/or place of residence. For S and Zn, the distribution along hair strands revealed a trend towards a heavier isotopic signature from the proximal to the distal end, with a maximum difference within the hair of a single subject of 1.2‰ (Δ34S) and 0.4‰ (Δ66Zn). For Fe, Cu, Mg and Cd, a shift towards either a lighter (Cu) or heavier (Fe, Mg and Cd) isotopic composition is accompanied by increasing concentration towards the distal hair end, indicating possible isotope fractionation during deposition or external contamination with a different isotopic composition. Pb and Sr isotope ratios are relatively stable throughout the hair strands despite notable concentration increases towards the distal end, likely reflecting external contamination. The isotopic composition of Sr points to tap water as a probable main source, explaining the relative stability of the ratio for individuals from the same geographical location. For Pb, isotopic compositions suggest tap water and/or indoor dust as possible sources. Similar δ34S, 87Sr/86Sr, 207,208Pb/206Pb, δ66Zn, δ56Fe, and δ65Cu observed for hair, fingernails and toenails sampled from the same individual suggest that keratinous tissues are conservative receivers of internal and external inputs and can be used complementary. Seasonal variation in δ34S, 207,208Pb/206Pb, and δ65Cu was observed for fingernails.
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Affiliation(s)
- Katerina Rodiouchkina
- Ghent University, Department of Chemistry, Atomic and Mass Spectrometry (A&MS) research group, Campus Sterre, Krijgslaan 281 - S12, 9000 Ghent, Belgium
| | - Ilia Rodushkin
- ALS Scandinavia AB, ALS Laboratory Group, Aurorum 10, S-977 75 Luleå, Sweden
| | - Steven Goderis
- Vrije Universiteit Brussel, Department of Chemistry, Analytical, Environmental and Geo-Chemistry (AMGC) research group, Pleinlaan 2, 1050 Brussels, Belgium
| | - Frank Vanhaecke
- Ghent University, Department of Chemistry, Atomic and Mass Spectrometry (A&MS) research group, Campus Sterre, Krijgslaan 281 - S12, 9000 Ghent, Belgium.
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4
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Schilling K, Harris AL, Halliday AN, Schofield CJ, Sheldon H, Haider S, Larner F. Investigations on Zinc Isotope Fractionation in Breast Cancer Tissue Using in vitro Cell Culture Uptake-Efflux Experiments. Front Med (Lausanne) 2022; 8:746532. [PMID: 35127740 PMCID: PMC8811157 DOI: 10.3389/fmed.2021.746532] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Accepted: 12/14/2021] [Indexed: 12/24/2022] Open
Abstract
Zinc (Zn) accumulates in breast cancer tumors compared to adjacent healthy tissue. Clinical samples of breast cancer tissue show light Zn isotopic compositions (δ66Zn) relative to healthy tissue. The underlying mechanisms causing such effects are unknown. To investigate if the isotopic discrimination observed for in vivo breast cancer tissue samples can be reproduced in vitro, we report isotopic data for Zn uptake-efflux experiments using a human breast cancer cell line. MDA-MB-231 cell line was used as a model for triple receptor negative breast cancer. We determined Zn isotope fractionation for Zn cell uptake (Δ66Znuptake) and cell efflux (Δ66Znefflux) using a drip-flow reactor to enable comparison with the in vivo environment. The MDA-MB-231 cell line analyses show Zn isotopic fractionations in an opposite direction to those observed for in vivo breast cancer tissue. Uptake of isotopically heavy Zn (Δ66Znuptake = +0.23 ± 0.05‰) is consistent with transport via Zn transporters (ZIPs), which have histidine-rich binding sites. Zinc excreted during efflux is isotopically lighter than Zn taken up by the cells (Δ66Znefflux = -0.35 ± 0.06‰). The difference in Zn isotope fractionation observed between in vitro MDA-MB-231 cell line experiments and in vivo breast tissues might be due to differences in Zn transporter levels or intercellular Zn storage (endoplasmic reticulum and/or Zn specific vesicles); stromal cells, such as fibroblasts and immune cells. Although, additional experiments using other human breast cancer cell lines (e.g., MCF-7, BT-20) with varying Zn protein characteristics are required, the results highlight differences between in vitro and in vivo Zn isotope fractionation.
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Affiliation(s)
- Kathrin Schilling
- Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States
- Department of Medical Oncology, Molecular Oncology Laboratories, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | - Adrian L. Harris
- Department of Medical Oncology, Molecular Oncology Laboratories, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Alex N. Halliday
- Lamont Doherty Earth Observatory, Columbia University, Palisades, NY, United States
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
| | | | - Helen Sheldon
- Department of Medical Oncology, Molecular Oncology Laboratories, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
| | - Syed Haider
- The Breast Cancer Now Toby Robins Breast Cancer Research Centre, The Institute of Cancer Research, London, United Kingdom
| | - Fiona Larner
- Department of Medical Oncology, Molecular Oncology Laboratories, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, United Kingdom
- Department of Earth Sciences, University of Oxford, Oxford, United Kingdom
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5
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Kubik E, Moynier F, Paquet M, Siebert J. Iron Isotopic Composition of Biological Standards Relevant to Medical and Biological Applications. Front Med (Lausanne) 2021; 8:696367. [PMID: 34746169 PMCID: PMC8563829 DOI: 10.3389/fmed.2021.696367] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Accepted: 09/13/2021] [Indexed: 01/01/2023] Open
Abstract
Iron isotopes are fractionated by multiple biological processes, which offers a novel opportunity to study iron homeostasis. The determination of Fe isotope composition in biological samples necessitates certified biological reference materials with known Fe isotopic signature in order to properly assess external reproducibility and data quality between laboratories. We report the most comprehensive study on the Fe isotopic composition for widely available international biological reference materials. They consist of different terrestrial and marine animal organs (bovine, porcine, tuna, and mussel) as well as apple leaves and human hair (ERC-CE464, NIST1515, ERM-DB001, ERM-BB186, ERM-BB184, ERM-CE196, BCR668, ERM-BB185, ERM-BB124). Previously measured Fe isotopic compositions were available for only two of these reference materials (ERC-CE464 tuna fish and ERM-BB186 pig kidney) and these literature data are in excellent agreement with our data. The Fe isotopic ratios are reported as the permil deviation of the 56Fe/54Fe ratio from the IRMM-014 standard. All reference materials present δ56Fe ranging from −2.27 to −0.35%0. Combined with existing data, our results suggest that animal models could provide useful analogues of the human body regarding the metabolic pathways affecting Fe isotopes, with many potential applications to medicine.
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Affiliation(s)
- Edith Kubik
- Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France
| | - Frédéric Moynier
- Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France.,Institut Universitaire de France, Paris, France
| | - Marine Paquet
- Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France
| | - Julien Siebert
- Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France.,Institut Universitaire de France, Paris, France
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6
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Schilling K, Moore RET, Sullivan KV, Capper MS, Rehkämper M, Goddard K, Ion C, Coombes RC, Vesty-Edwards L, Lamb AD, Halliday AN, Larner F. Zinc stable isotopes in urine as diagnostic for cancer of secretory organs. Metallomics 2021; 13:mfab020. [PMID: 33877364 DOI: 10.1093/mtomcs/mfab020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 03/09/2021] [Accepted: 04/16/2021] [Indexed: 12/31/2022]
Abstract
Breast, prostate, and pancreatic cancers alter the zinc (Zn) metabolism. Combined analyses of urinary Zn concentrations [Zn] and Zn stable isotope compositions (δ66Zn) may provide a non-invasive approach for tracing malignancy-induced Zn dyshomeostasis. In this study, we measured [Zn] and δ66Zn in urine from prostate (n = 22), breast (n = 16), and from women with benign breast disease (n = 14) and compared those with age-matched healthy controls (22-49 years or 50+ years) and published data for pancreatic cancer (n = 17). Our results show that cancer-induced changes are reflected in higher urinary [Zn] and lower urinary δ66Zn for pancreatic and prostate cancer and benign breast disease when compared with healthy controls. For prostate cancer, the progression of low [Zn] and high δ66Zn for patients of low-risk disease toward high [Zn] and low δ66Zn for the higher risk patients demonstrates that [Zn] and δ66Zn in urine could serve as a reliable prognostic tool. Urinary excretion of isotopically light Zn by patients with prostatic and pancreatic cancer is probably the result of increased reactive oxygen species in cancerous cells, which limits the scavenging of hydroxyl radicals and thus facilitates the oxidation of metalloproteins with sulfur-rich ligands. Urine from breast cancer patients shows undistinguishable δ66Zn to healthy controls, implying that the expression of metalloproteins with sulfur-rich ligands is stronger in breast cancer tissues. In conclusion, urinary δ66Zn may provide a non-invasive diagnostic tool for pancreatic cancer and support disease prognosis for prostate cancer. These findings should translate to comprehensive transverse and longitudinal cohort studies in future.
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Affiliation(s)
- Kathrin Schilling
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA
| | - Rebekah E T Moore
- Department of Earth Science and Engineering, Imperial College London, London, UK
| | - Kaj V Sullivan
- Department of Renewable Resources, University of Alberta, Alberta, Canada
| | - Miles S Capper
- Department of Earth Science and Engineering, Imperial College London, London, UK
| | - Mark Rehkämper
- Department of Earth Science and Engineering, Imperial College London, London, UK
| | - Kate Goddard
- Imperial College Healthcare NHS Trust, London, UK
| | | | | | - Lois Vesty-Edwards
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | - Alastair D Lamb
- Nuffield Department of Surgical Sciences, University of Oxford, Oxford, UK
| | | | - Fiona Larner
- Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, UK
- St Catherine's College, University of Oxford, Manor Road, Oxford, UK
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7
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Sullivan KV, Moore RET, Capper MS, Schilling K, Goddard K, Ion C, Layton-Matthews D, Leybourne MI, Coles B, Kreissig K, Antsygina O, Coombes RC, Larner F, Rehkämper M. Zinc stable isotope analysis reveals Zn dyshomeostasis in benign tumours, breast cancer, and adjacent histologically normal tissue. Metallomics 2021; 13:6273136. [PMID: 33970272 DOI: 10.1093/mtomcs/mfab027] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 04/29/2021] [Accepted: 05/03/2021] [Indexed: 12/15/2022]
Abstract
The disruption of Zn homeostasis has been linked with breast cancer development and progression. To enhance our understanding of changes in Zn homeostasis both inside and around the tumour microenvironment, Zn concentrations and isotopic compositions (δ66Zn) were determined in benign (BT) and malignant (MT) tumours, healthy tissue from reduction mammoplasty (HT), and histologically normal tissue adjacent to benign (NAT(BT)) and malignant tumours (NAT(MT)). Mean Zn concentrations in NAT(BT) are 5.5 µg g-1 greater than in NAT(MT) (p = 0.00056) and 5.1 µg g-1 greater than in HT (p = 0.0026). Zinc concentrations in MT are 12.9 µg g-1 greater than in HT (p = 0.00012) and 13.3 µg g-1 greater than in NAT(MT) (p < 0.0001), whereas δ66Zn is 0.17‰ lower in MT than HT (p = 0.017). Benign tumour Zn concentrations are also elevated compared to HT (p = 0.00013), but are not significantly elevated compared to NAT(BT) (p = 0.32). The δ66Zn of BT is 0.15‰ lower than in NAT(BT) (p = 0.045). The similar light δ66Zn of BT and MT compared to HT and NAT may be related to the isotopic compensation of increased metallothionein (64Zn-rich) expression by activated matrix metalloproteinase (66Zn-rich) in MT, and indicates a resultant 66Zn-rich reservoir may exist in patients with breast tumours. Zinc isotopic compositions thus show promise as a potential diagnostic tool for the detection of breast tumours. The revealed differences of Zn accumulation in healthy and tumour-adjacent tissues require additional investigation.
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Affiliation(s)
- Kaj V Sullivan
- Department of Geological Sciences and Geological Engineering, Queen's University, 36 Union Street, Kingston, K7L 2N8, Canada.,Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Rebekah E T Moore
- Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Miles S Capper
- Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Kathrin Schilling
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA
| | - Kate Goddard
- Department of Surgery and Cancer, Imperial College, ICTEM, Hammersmith Hospital, Du Cane Rd, London W12 ONS, UK
| | - Charlotte Ion
- Department of Surgery and Cancer, Imperial College, ICTEM, Hammersmith Hospital, Du Cane Rd, London W12 ONS, UK
| | - Daniel Layton-Matthews
- Department of Geological Sciences and Geological Engineering, Queen's University, 36 Union Street, Kingston, K7L 2N8, Canada
| | - Matthew I Leybourne
- Department of Geological Sciences and Geological Engineering, Queen's University, 36 Union Street, Kingston, K7L 2N8, Canada.,Arthur B. McDonald Canadian Astroparticle Physics Research Institute, Department of Physics, Engineering Physics & Astronomy, Queen's University, 64 Bader Lane, Kingston, K7L 3N6, Canada
| | - Barry Coles
- Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Katharina Kreissig
- Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Olga Antsygina
- Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 8L1, Canada.,Department of Health Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada
| | - R Charles Coombes
- Department of Surgery and Cancer, Imperial College, ICTEM, Hammersmith Hospital, Du Cane Rd, London W12 ONS, UK
| | - Fiona Larner
- Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK.,St Catherine's College, Manor Road, Oxford OX1 3UJ, UK.,Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Campus, Didcot OX11 0DE, UK
| | - Mark Rehkämper
- Department of Earth Science & Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK
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8
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Phiri FP, Ander EL, Lark RM, Joy EJM, Kalimbira AA, Suchdev PS, Gondwe J, Hamilton EM, Watts MJ, Broadley MR. Spatial analysis of urine zinc (Zn) concentration for women of reproductive age and school age children in Malawi. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2021; 43:259-271. [PMID: 32862269 PMCID: PMC7847879 DOI: 10.1007/s10653-020-00700-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 08/18/2020] [Indexed: 05/04/2023]
Abstract
Zinc (Zn) is an essential micronutrient, and Zn deficiency remains a major global public health challenge. Recognised biomarkers of population Zn status include blood plasma or serum Zn concentration and proxy data such as dietary Zn intake and prevalence of stunting. Urine Zn concentration is rarely used to assess population Zn status. This study assessed the value of urine Zn concentration as a biomarker of population Zn status using a nationally representative sample of non-pregnant women of reproductive age (WRA) and school-aged children (SAC) in Malawi. Spot (casual) urine samples were collected from 741 WRA and 665 SAC. Urine Zn concentration was measured by inductively coupled plasma mass spectrometry with specific gravity adjustment for hydration status. Data were analysed using a linear mixed model with a spatially correlated random effect for between-cluster variation. The effect of time of sample collection (morning or afternoon), and gender (for SAC), on urine Zn concentration were examined. There was spatial dependence in urine Zn concentration between clusters among SAC but not WRA, which indicates that food system or environmental factors can influence urine Zn concentration. Mapping urine Zn concentration could potentially identify areas where the prevalence of Zn deficiency is greater and thus where further sampling or interventions might be targeted. There was no evidence for differences in urine Zn concentration between gender (P = 0.69) or time of sample collection (P = 0.85) in SAC. Urine Zn concentration was greater in afternoon samples for WRA (P = 0.003). Relationships between urine Zn concentration, serum Zn concentration, dietary Zn intake, and potential food systems covariates warrant further study.
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Affiliation(s)
- Felix P. Phiri
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD UK
- Department of Nutrition, HIV and AIDS, Ministry of Health, P. Bag B401, Lilongwe, Malawi
| | - E. Louise Ander
- Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Nottingham, NG12 5GG UK
| | - R. Murray Lark
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD UK
| | - Edward J. M. Joy
- Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, Keppel Street, London, WC1E 7HT UK
| | - Alexander A. Kalimbira
- Department of Human Nutrition and Health, Faculty of Food and Human Sciences, Bunda Campus, Lilongwe University of Agriculture and Natural Resources, P.O. Box 219, Lilongwe, Malawi
| | - Parminder S. Suchdev
- Department of Pediatrics and Hubert Department of Global Health, Emory University, Atlanta, GA 30322 USA
| | - Jellita Gondwe
- Community Health Sciences Unit, Ministry of Health, Private Bag 65, Lilongwe, Malawi
| | - Elliott M. Hamilton
- Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Nottingham, NG12 5GG UK
| | - Michael J. Watts
- Inorganic Geochemistry, Centre for Environmental Geochemistry, British Geological Survey, Nottingham, NG12 5GG UK
| | - Martin R. Broadley
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, Leicestershire, LE12 5RD UK
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9
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Sauzéat L, Costas-Rodríguez M, Albalat E, Mattielli N, Vanhaecke F, Balter V. Inter-comparison of stable iron, copper and zinc isotopic compositions in six reference materials of biological origin. Talanta 2020; 221:121576. [PMID: 33076122 DOI: 10.1016/j.talanta.2020.121576] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/16/2020] [Accepted: 08/11/2020] [Indexed: 01/19/2023]
Abstract
There is a lack of certified reference materials with an organic matrix for which metal isotope ratios have been certified. Here, we have determined the iron, copper and zinc stable isotopic compositions for six reference materials of biological origin with diverse matrices, i.e. BCR-380R (whole milk), BCR-383 (beans), ERM-CE464 (tuna fish), SRM-1577c (bovine liver), DORM-4 (fish protein) and TORT-3 (lobster hepatopancreas) in three different labs. The concentrations for six major and sixteen trace elements, spanning almost four orders of magnitude, were also measured and the results obtained show an excellent agreement with certified values, demonstrating that the dissolution step was quantitative for all the standards. By taking literature data into account, 39 possible pair-wise comparisons of mean iron, copper and zinc isotopic values (δ values) could be made. Results of Tukey multiple comparisons of means yielded 11 significantly different pairs. Most of these differences are of the same order of magnitude as the estimated mean expanded uncertainties (U, k = 2) (±0.10‰, ±0.05‰, and ±0.05‰ for the δ56Fe, δ65Cu and δ66Zn values, respectively). The present inter-comparison study finally proposes nineteen new preferred values for the Cu, Zn and Fe isotopic compositions of six reference materials of biological origin.
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Affiliation(s)
- Lucie Sauzéat
- Université Clermont Auvergne, CNRS, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000, Clermont-Ferrand, France; Université Clermont Auvergne, CNRS, Inserm, Génétique, Reproduction et Développement, F-63000, Clermont-Ferrand, France
| | - Marta Costas-Rodríguez
- Atomic & Mass Spectrometry - A&MS Research Unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium
| | | | - Nadine Mattielli
- Laboratoire G-Time, DGES, Université Libre de Bruxelles (ULB), Av. Roosevelt 50, CP 160/02, 1050, Brussels, Belgium
| | - Frank Vanhaecke
- Atomic & Mass Spectrometry - A&MS Research Unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium
| | - Vincent Balter
- Univ Lyon, ENSL, Univ Lyon 1, CNRS, LGL-TPE, F-69007, Lyon, France.
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