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JBIC Journal of Biological Inorganic Chemistry

, Volume 17, Issue 2, pp 301–309 | Cite as

Mobilization of storage iron is reflected in the iron isotopic composition of blood in humans

  • Karin Hotz
  • Pierre-Alexandre Krayenbuehl
  • Thomas Walczyk
Original Paper

Abstract

We recently showed in an animal model that iron isotopic composition varies substantially between different organs. For instance, iron in ferritin-rich organs—such as the major storage tissues liver, spleen, and bone marrow—contain a larger fraction of the heavy iron isotopes compared with other tissues, including blood. As a consequence, partitioning of body iron into red blood cells and storage compartments should be reflected in the isotopic pattern of blood iron. To confirm this hypothesis, we monitored blood iron isotope patterns in iron-overloaded subjects undergoing phlebotomy treatment by multicollector inductively coupled plasma mass spectrometry. We found that bloodletting and consequential replacement of lost blood iron by storage iron led to a substantial increase of the heavy isotope fraction in the blood. The progress of iron depletion therapy and blood loss was quantitatively traceable by isotopic shifts of as much as +1‰ in δ(56Fe). These results show that—together with iron absorption efficiency—partitioning of iron between blood and iron storage tissues is an important determinant of blood iron isotopic patterns, which could make blood iron isotopic composition the first composite measure of iron metabolism in humans.

Keywords

Iron isotopes Hemochromatosis Mass spectrometry Phlebotomy Storage iron 

Notes

Acknowledgments

The authors would like to thank R.F. Hurrell (ETH Zurich, Switzerland) for providing the laboratory infrastructure required for this research project and for his generous advice and support, F. von Blanckenburg (Geo-Forschungs-Zentrum, Potsdam, Germany) for valuable discussions, C. Zeder (ETH Zurich, Switzerland) for his technical assistance, and M.R. Eugster (ETH Zurich, Switzerland) for critical reading of the manuscript. This work was supported by the Swiss National Science Foundation, grant no. 3200B0-105896.

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Copyright information

© SBIC 2011

Authors and Affiliations

  • Karin Hotz
    • 1
  • Pierre-Alexandre Krayenbuehl
    • 2
  • Thomas Walczyk
    • 3
  1. 1.Laboratory of Human Nutrition, Institute of Food, Nutrition and HealthETH ZurichZurichSwitzerland
  2. 2.Department of Internal MedicineUniversity Hospital ZurichZurichSwitzerland
  3. 3.Department of Chemistry (Science) and Department of Biochemistry (Medicine)National University of SingaporeSingaporeSingapore

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