Format

Send to

Choose Destination
J Cereb Blood Flow Metab. 2015 Jan;35(1):48-57. doi: 10.1038/jcbfm.2014.168. Epub 2014 Oct 15.

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

Author information

1
Department of Neural and Behavioral Sciences, Penn State Hershey Medical Center, Hershey, Pennsylvania, USA.
2
Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, Pennsylvania, USA.
3
Harlow Center for Biological Psychology, University of Wisconsin, Madison, Wisconsin, USA.
4
Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, USA.
5
1] Department of Neural and Behavioral Sciences, Penn State Hershey Medical Center, Hershey, Pennsylvania, USA [2] Department of Neurosurgery, Penn State Hershey Medical Center, Hershey, Pennsylvania, USA.

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.

PMID:
25315861
PMCID:
PMC4294394
DOI:
10.1038/jcbfm.2014.168
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Atypon Icon for PubMed Central
Loading ...
Support Center