Open Access
Polymorphisms in Iron Homeostasis Genes and Urinary Cadmium Concentrations among Nonsmoking Women in Argentina and Bangladesh
Gerda Rentschler1, Maria Kippler2, Anna Axmon1, Rubhana Raqib3, Eva-Charlotte Ekström4, Staffan Skerfving1, Marie Vahter2, Karin Broberg1,2
1Department of Laboratory Medicine, Division of Occupational and Environmental Medicine, Lund University, Lund, Sweden; 2Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden; 3International Centre for Diarrhoeal Disease Research, Bangladesh (icddr,b), Dhaka, Bangladesh; 4Department Women’s and Children’s Health, Uppsala University, Uppsala, Sweden
Advance Publication
Abstract
Background: Cadmium (Cd) is a human toxicant and carcinogen. Genetic variation might affect long-term accumulation. Cadmium is absorbed by iron transporters.
Objectives: To evaluate the impact of iron homeostasis genes (divalent metal transporter 1 SLC11A2; transferrin TF; transferrin receptors TFR2 and TFRC; ferroportin SLC40A1) on Cd accumulation.
Methods: Subjects were non-smoking women living in the Argentinean Andes [n=172; median urinary Cd (U-Cd)=0.24 μg/L] and Bangladesh (n=359; U-Cd=0.53 μg/L) with Cd exposure mainly from food. U-Cd and Cd in whole blood or erythrocytes (Ery-Cd) was measured by ICPMS. Fifty polymorphisms were genotyped by Sequenom. Gene expression was measured in whole blood (n=72) with Illumina DirectHyb HumanHT-12 v4.0.
Results: TFRC rs3804141 was consistently associated with U-Cd. In the Andeans, mean U-Cd concentrations were 22% (95% CI: -2, 51%) and 56% (95% CI: 10, 120%) higher in women with GA and AA genotypes, respectively, relative to women with the GG genotype. In Bangladesh, mean U-Cd concentrations were 22% (95% CI: 1, 48%) and 58% (95% CI: -3, 157%) higher in women with GA and AA versus GG genotype, respectively (adjusted for age and plasma ferritin in both groups; p for trend 0.006 [Andes] and 0.009 [Bangladesh]). TFRC expression in blood was negatively correlated with plasma ferritin (rS=-0.33, p=0.006), and positively correlated with Ery-Cd (significant at ferritin concentrations <30 μg/L only, rS=0.40, p=0.046). Rs3804141 did not modify these associations or predict TFRC expression. Cd was not consistently associated with any of the other polymorphisms evaluated.
Conclusions: One TFRC polymorphism was associated with urine Cd concentration, a marker of Cd accumulation in the kidney, in two very different populations. The consistency of the findings supports the possibility of a causal association.
Citation: Rentschler G, Kippler M, Axmon A, Raqib R, Ekström EC, Skerfving S, Vahter M, Broberg K. Environ Health Perspect (): .doi:10.1289/ehp.1205672
Received: June 26, 2012; Accepted: February 14, 2013; Published: February 15, 2013
Advance Publication
This EHP Advance Publication article has been peer-reviewed, revised, and accepted for publication. The EHP Advance Publication articles are completely citable using the assigned DOI code for the article. This document will be replaced with the copyedited and formatted version as soon as it is available. Through the DOI number used in the citation, you will be able to access this document at each stage of the publication process.
Attached Files
Recent Advance Publications
- Prenatal Exposure to the Pesticide DDT and Hypertension Diagnosed in Women Before Age 50: A Longitudinal Birth Cohort Study
- Effects of Eyjafjallajökull Volcanic Ash on Innate Immune System Responses and Bacterial Growth in Vitro
- Exposure to Perfluoroalkyl Acids and Markers of Kidney Function Among Children and Adolescents Living Near a Chemical Plant
- Land Application of Treated Sewage Sludge: Community Health and Environmental Justice
- Phthalate Concentrations and Dietary Exposure from Food Purchased in New York State
- Polycyclic Aromatic Hydrocarbons in Residential Dust: Sources of Variability
- Cardiovascular Outcomes and the Physical and Chemical Properties of Metal Ions Found in Particulate Matter Air Pollution: a QICAR Study
0 comments