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The Journal of Neurophysiology Vol. 86 No. 5 November 2001, pp. 2597-2604
Copyright ©2001 by the American Physiological Society
1Department of Pharmacology and 2Department of Psychiatry, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20814; 3Center for Biomedical Engineering and Department of Anatomy and Neuroscience, University of Texas Medical Branch; and 4NeuroBioTex, Inc., Galveston, Texas 77555
Li, Yang,
Christopher J. Hough,
Sang Won Suh,
John
M. Sarvey, and
Christopher J. Frederickson.
Rapid Translocation of Zn2+ From Presynaptic
Terminals Into Postsynaptic Hippocampal Neurons After Physiological
Stimulation. J. Neurophysiol. 86: 2597-2604, 2001. Zn2+ is found in
glutamatergic nerve terminals throughout the mammalian forebrain and
has diverse extracellular and intracellular actions. The anatomical
location and possible synaptic signaling role for this cation have led
to the hypothesis that Zn2+ is released from
presynaptic boutons, traverses the synaptic cleft, and enters
postsynaptic neurons. However, these events have not been directly
observed or characterized. Here we show, using microfluorescence
imaging in rat hippocampal slices, that brief trains of electrical
stimulation of mossy fibers caused immediate release of
Zn2+ from synaptic terminals into the
extracellular microenvironment. Release was induced across a broad
range of stimulus intensities and frequencies, including those likely
to induce long-term potentiation. The amount of
Zn2+ release was dependent on stimulation
frequency (1-200 Hz) and intensity. Release of
Zn2+ required sodium-dependent action potentials
and was dependent on extracellular Ca2+. Once
released, Zn2+ crosses the synaptic cleft and
enters postsynaptic neurons, producing increases in intracellular
Zn2+ concentration. These results indicate that,
like a neurotransmitter, Zn2+ is stored in
synaptic vesicles and is released into the synaptic cleft. However,
unlike conventional transmitters, it also enters postsynaptic neurons,
where it may have manifold physiological functions as an intracellular
second messenger.
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