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BioMetals

, Volume 27, Issue 6, pp 1371–1382 | Cite as

In vitro heme and non-heme iron capture from hemoglobin, myoglobin and ferritin by bovine lactoferrin and implications for suppression of reactive oxygen species in vivo

  • Hemalatha Jegasothy
  • Rangika Weerakkody
  • Sophie Selby-Pham
  • Louise E. BennettEmail author
Article

Abstract

Lactoferrin (Lf), present in colostrum and milk is a member of the transferrin family of iron-binding glyco-proteins, with stronger binding capacity to ferric iron than hemoglobin, myoglobin or transferrin. Unlike hemoglobin and myoglobin, iron-bound Lf is reasonably stable to gastric and duodenal digestive conditions. Unlike ferrous iron, ferric iron is not directly reactive with oxygen supporting the capacity of Lf capture of heme iron to suppress reactive oxygen species (ROS) production. We therefore hypothesized that bovine Lf could capture and thereby terminate the cycle of ROS production by heme iron. The transfer of heme iron from either intact or digested forms of hemoglobin and myoglobin and from intact ferritin was demonstrated by in vitro methods, monitoring Fe-saturation status of Lf by changes in absorptivity at 465 nm. The results are discussed in the context of new proposed opportunities for orally administered Lf to regulate oxidative damage associated with heme iron. In addition to potentially suppressing oxidative heme–iron-mediated tissue damage in the lumen, Lf is expected to also reverse the overload of ferritin-bound iron, that accompanies chronic inflammation and aging. These new proposed uses of Lf are additional to known host defense functions that include anti-microbial, anti-viral properties, immune and cancer cell growth regulation. The findings and interpretations presented require clinical substantiation and may support important additional protective and therapeutic uses for Lf in the future.

Keywords

Lactoferrin Iron Heme Non-heme Reactive oxygen species Anti-oxidant  Digestion Oxidative stress 

Abbreviations

Lf

Lactoferrin

Hb

Hemoglobin

Myo

Myoglobin

HO

Heme oxygenase

Notes

Acknowledgments

This work was conducted with support from the CSIRO Preventative Health National Research Flagship. Minerals analysis by Richard Phillips is also gratefully acknowledged.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Hemalatha Jegasothy
    • 1
  • Rangika Weerakkody
    • 1
  • Sophie Selby-Pham
    • 1
  • Louise E. Bennett
    • 1
    Email author
  1. 1.CSIRO Food, Nutrition and BioproductsWerribeeAustralia

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