Abstract
To establish for the first time how mice might differ from rats and humans in terms of copper transport, excretion, and copper binding proteins, plasma and organ cytosols from adult female C57CL6 mice were fractionated and analyzed by directly coupled size exclusion HPLC-ICP-MS, before and after i.p. injection of large doses of 65Cu. Plasma from untreated mice had different proportions of Cu associated with transcuprein/macroglobulin, ceruloplasmin and albumin than in humans and rats, and two previously undetected copper peaks (Mr 700 k and 15 k) were observed. Cytosols had Cu peaks seen previously in rat liver (Mr > 1000 k, 45 k and 11 k) plus one of 110 kDa. 65Cu (141 μg) administered over 14 h, initially loaded plasma albumin and mainly entered liver and kidney (especially 28 kDa and 11 kDa components). Components of other organs were less (but still significantly) enriched. 63Cu/65Cu ratios returned almost to normal by 14 days, indicating a robust system for excreting excess copper. We conclude that there are significant differences but also strong similarities in copper metabolism between mice, rats and humans; that the liver is able to buffer enormous changes in copper status; and that a large number of mammalian copper proteins remain to be identified.
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Abbreviations
- Mr:
-
Apparent molecular weight
- k:
-
Thousands (as in apparent molecular weight)
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Acknowledgements
This work was supported in part by USPHS Grant RO1 HD46949 and NSF REU grant CHE 0354159 to M. C. Linder; and NSF grants DBI-9978806 and OCE-9977564 to A. Z. Mason. We are grateful to Dr. Z. Leah Harris for the breeding pairs for our colony of ceruloplasmin knockout mice.
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Cabrera, A., Alonzo, E., Sauble, E. et al. Copper binding components of blood plasma and organs, and their responses to influx of large doses of 65Cu, in the mouse. Biometals 21, 525–543 (2008). https://doi.org/10.1007/s10534-008-9139-6
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DOI: https://doi.org/10.1007/s10534-008-9139-6