A novel model for brain iron uptake: Introducing the concept of regulation

Ian A. Simpson, Padmavathi Ponnuru, Marianne E. Klinger, Roland L. Myers, Kavi Devraj, Christopher L. Coe, Gabriele R. Lubach, Anthony Carruthers, James R. Connor

Research output: Contribution to journalArticle

63 Scopus citations

Abstract

Neurologic disorders such as Alzheimer's, Parkinson's disease, and Restless Legs Syndrome involve a loss of brain iron homeostasis. Moreover, iron deficiency is the most prevalent nutritional concern worldwide with many associated cognitive and neural ramifications. Therefore, understanding the mechanisms by which iron enters the brain and how those processes are regulated addresses significant global health issues. The existing paradigm assumes that the endothelial cells (ECs) forming the blood-brain barrier (BBB) serve as a simple conduit for transport of transferrin-bound iron. This concept is a significant oversimplification, at minimum failing to account for the iron needs of the ECs. Using an in vivo model of brain iron deficiency, the Belgrade rat, we show the distribution of transferrin receptors in brain microvasculature is altered in luminal, intracellular, and abluminal membranes dependent on brain iron status. We used a cell culture model of the BBB to show the presence of factors that influence iron release in non-human primate cerebrospinal fluid and conditioned media from astrocytes; specifically apo-transferrin and hepcidin were found to increase and decrease iron release, respectively. These data have been integrated into an interactive model where BBB ECs are central in the regulation of cerebral iron metabolism.

Original languageEnglish (US)
Pages (from-to)48-57
Number of pages10
JournalJournal of Cerebral Blood Flow and Metabolism
Volume35
Issue number1
DOIs
StatePublished - Jan 10 2015

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology
  • Cardiology and Cardiovascular Medicine

Cite this