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Biological Trace Element Research

, Volume 123, Issue 1–3, pp 261–269 | Cite as

Ceruloplasmin, an Indicator of Copper Status

  • Miguel ArredondoEmail author
  • Mauricio González
  • Manuel Olivares
  • Fernando Pizarro
  • Magdalena Araya
Article

Abstract

For clinical purposes, the non-ceruloplasmin copper fraction is routinely derived on the basis that ceruloplasmin binds six Cu atoms. However, this approach is limited because the actual ceruloplasmin copper binding is unclear. We performed direct measurement of the total serum copper and ceruloplasmin in 790 healthy individuals. We used an immunoprecipitation technique to separate ceruloplasmin and determined Cu content. With these values, we calculated the Cu/ceruloplasmin (Cp) ratio and thus generated data to support or discard the theoretical calculation of the non-ceruloplasmin fraction. Average of serum Cu and Cp levels were 18.4 ± 4.4 μmol/l and 390 ± 100 mg/l, respectively. The immunoprecipitation procedure allowed us to calculate a Cu/Cp ratio of 5.8, respectively, which supports the methodology of calculation that assigns a mean of six copper atoms to each ceruloplasmin molecule. With these values, we calculated that, in apparently normal adults, the non-ceruloplasmin copper (NCPC) fraction is lower than 1.3 μmol/l of Cu. In this report, we examine the Cp/Cu ratio by using Cp immunoprecipitation procedure. Our in vitro and in vivo studies indicate that, as a mean, there are 5.8 atoms of Cu per Cp molecule and that <1.3 μmol/l of Cu would correspond to the NCPC.

Keywords

Ceruloplasmin Copper Non-ceruloplasmin copper 

Abbreviations

Cp

Ceruloplasmin

Cu

copper

NCPC

non-ceruloplasmin copper

Notes

Acknowledgements

This work was supported by Corporación Chilena del Cobre (Cochilco), International Copper Association (ICA, NY, USA), Corporación para Apoyo de la Investigación Científica en Nutrición (CINUT) and Fondo Nacional de Desarrollo Científico y Tecnológico (Fondecyt) 1040979 from M. Araya, in the form of unrestricted grant.

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Copyright information

© Humana Press Inc. 2008

Authors and Affiliations

  • Miguel Arredondo
    • 1
    Email author
  • Mauricio González
    • 2
  • Manuel Olivares
    • 1
  • Fernando Pizarro
    • 1
  • Magdalena Araya
    • 1
  1. 1.Micronutrient Laboratory, Nutrition and Food Technology Institute (INTA)University of ChileMaculChile
  2. 2.Bioinformatic and Genetic Expression Laboratory, Nutrition and Food Technology Institute (INTA)University of ChileMaculChile

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