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Chaperones CCS, ATOX and COXIV responses to copper supplementation in healthy adults

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Abstract

Assessment of proteins in blood and other tissues has failed to identify markers of early copper effects on health. Studies in animal models show that chaperone of SOD (CCS) respond to changes of copper status. Evidence about other copper chaperones (COXIV, ATOX) is not clear. The aim of this study was to assess by means of an in vitro challenge the mRNA relative abundance of ccs, sod1, coxIV, mtIIa and atox in peripheral mononuclear cells (PMNCs) obtained from healthy individuals, acutely and chronically supplemented with small-to-moderate amounts of copper. Healthy participants received 8 mg Cu/d (supplemented group, SG) or placebo, (placebo group, PG) for 2 months. Biochemical indicators were assessed at basal (T0) and after 2 (T2) and 60 days (T60). At these times PMNCs were obtained, challenged with 1, 5 or 20 μM Cu-histidine for 20 h and the mRNA relative abundance of the selected genes assessed by real time PCR. The results showed that at T0, intracellular copper was not different between experimental and control groups. This increased at T2 and T60 when the copper in the media increased (two-way ANOVA, P < 0.001). In PG, CCS mRNA transcripts showed no significant changes (two-way ANOVA) at T2 and T60. In SG, CCS changed by treatment, time and interaction (two-way ANOVA, all P < 0.001). SOD, ATOX and COXIV expressions changed in both PG and SG showing various patterns of response, requiring further study. MTII responded as expected. We conclude that using healthy individuals as a human model, CCS but not SOD, ATOX or COXIV responded consistently to controlled changes of copper availability in an in vitro copper challenge.

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Acknowledgments

This project was funded by grant 1070595 FONDECYT (Chile).

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Authors and Affiliations

  1. Laboratory of Micronutrient, Institute of Nutrition and Food Technology (INTA), University of Chile, El Líbano 5524 Macul, Santiago, Chile

    Magdalena Araya, Monica Andrews, Fernando Pizarro & Miguel Arredondo

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  1. Magdalena Araya
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  2. Monica Andrews
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  3. Fernando Pizarro
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  4. Miguel Arredondo
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Correspondence to Magdalena Araya.

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Araya, M., Andrews, M., Pizarro, F. et al. Chaperones CCS, ATOX and COXIV responses to copper supplementation in healthy adults. Biometals 25, 383–391 (2012). https://doi.org/10.1007/s10534-011-9511-9

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  • DOI: https://doi.org/10.1007/s10534-011-9511-9

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