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The Journal of Neurophysiology Vol. 81 No. 6 June 1999, pp. 3096-3099
Copyright ©1999 by the American Physiological Society
RAPID COMMUNICATION
Departments of 1Psychiatry, 2Physiology, and 3Cellular and Molecular Pharmacology, University of California, San Francisco, California 94143
Hjelmstad, Gregory O.,
John T. R. Isaac,
Roger A. Nicoll, and
Robert C. Malenka.
Lack of AMPA Receptor Desensitization During Basal Synaptic
Transmission in the Hippocampal Slice. J. Neurophysiol. 81: 3096-3099, 1999.
Lack of AMPA receptor desensitization during basal synaptic
transmission in the hippocampal slice. Excitatory postsynaptic currents in the CA1 region of rat hippocampal slices are mediated primarily by
-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptors in response to synaptically released glutamate. Outside-out patches from pyramidal cells in this region have shown that
AMPA receptors are desensitized by short (1 ms) pulses of glutamate. We
have taken a number of approaches to ask whether synaptic receptors
desensitize in response to synaptically released glutamate in the
slice. Recordings with paired pulses and minimal stimulation conditions
that are presumably activating only a single release site do not show
evidence for desensitization. Furthermore, cyclothiazide, a drug that
blocks desensitization, does not alter paired-pulse ratios even under
conditions of high probability of release, which should maximize
desensitization. These results suggest that synaptic receptors do not
desensitize in response to synaptically released glutamate during basal
synaptic transmission.
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