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The Transferrin Cycle and Clinical Roles of Citrate and Ascorbate in Improved Iron Metabolism.

08:00 EDT 11th April 2019 | BioPortfolio

Summary of "The Transferrin Cycle and Clinical Roles of Citrate and Ascorbate in Improved Iron Metabolism."

Fe(III) delivery from blood plasma to cells via the transferrin (Tf) cycle is studied intensively due to its crucial role in Fe homeostasis. Tf-cycle disruptions are linked to anemia, infections, immunodeficiency and neurodegeneration. Bio-layer interferometry (BLI) enabled direct kinetic and thermodynamic measurements for all Tf-cycle steps in a single in-vitro experiment using Tf within blood serum or released into the medium by cultured liver cells. In these media, known Tf cycle features were reproduced as well as unprecedented insights into conditions of rapid endosomal (pH 5.6) Fe(III) release from the Tf-Tf receptor 1 (TfR1) adduct. This release occurred via synergistic citrate and ascorbate effects, which pointed to respective roles as the likely elusive Fe chelator and reductant within the Tf cycle. These results explain enhanced cellular Fe uptake by ascorbate, the clinical efficacy of anemia treatment with Fe citrate and ascorbate, and dietary effects associated with loss of Fe homeostasis including the large health burden of infections and neurodegeneration.

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This article was published in the following journal.

Name: ACS chemical biology
ISSN: 1554-8937
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A complex of proteins that forms a receptor for TRANSFERRIN in BACTERIA. Many pathogenic bacteria utilize the transferrin-binding complex to acquire their supply of iron from serum.

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