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Research Article

Zinc: The brain's dark horse

Byron K.Y. Bitanihirwe

Laboratory of Behavioral Neurobiology, Swiss Federal Institute of Technology, Zurich, Switzerland

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Miles G. Cunningham

Corresponding Author

E-mail address:mcunningham@mclean.harvard.edu

Laboratory for Neural Reconstruction, McLean Hospital, Belmont, Massachusetts

Program in Neuroscience and Department of Psychiatry, Harvard Medical School, Boston, Massachusetts

McLean Hospital, 115 Mill Street, Belmont, MA 02478, USA
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First published: 20 July 2009
Cited by: 122

Abstract

Zinc is a life‐sustaining trace element, serving structural, catalytic, and regulatory roles in cellular biology. It is required for normal mammalian brain development and physiology, such that deficiency or excess of zinc has been shown to contribute to alterations in behavior, abnormal central nervous system development, and neurological disease. In this light, it is not surprising that zinc ions have now been shown to play a role in the neuromodulation of synaptic transmission as well as in cortical plasticity. Zinc is stored in specific synaptic vesicles by a class of glutamatergic or “gluzinergic” neurons and is released in an activity‐dependent manner. Because gluzinergic neurons are found almost exclusively in the cerebral cortex and limbic structures, zinc may be critical for normal cognitive and emotional functioning. Conversely, direct evidence shows that zinc might be a relatively potent neurotoxin. Neuronal injury secondary to in vivo zinc mobilization and release occurs in several neurological disorders such as Alzheimer's disease and amyotrophic lateral sclerosis, in addition to epilepsy and ischemia. Thus, zinc homeostasis is integral to normal central nervous system functioning, and in fact its role may be underappreciated. This article provides an overview of zinc neurobiology and reviews the experimental evidence that implicates zinc signals in the pathophysiology of neuropsychiatric diseases. A greater understanding of zinc's role in the central nervous system may therefore allow for the development of therapeutic approaches where aberrant metal homeostasis is implicated in disease pathogenesis. Synapse 63:1029–1049, 2009. © 2009 Wiley‐Liss, Inc.

Number of times cited: 122

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