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Volume 16, Number 23, Issue of December 1, 1996 pp. 7496-7504
Copyright ©1996 Society for NeuroscienceDirect Measurement of AMPA Receptor Desensitization Induced by Glutamatergic Synaptic Transmission
Received Aug. 2, 1996; revised Sept. 11, 1996; accepted Sept. 13, 1996.
Thomas Otis, Su Zhang, and Laurence O. Trussell Department of Neurophysiology, University of Wisconsin, Madison, Wisconsin 53706
Although almost all ionotropic neurotransmitter receptors undergo desensitization, the onset and recovery of desensitization at a synapse have never been observed directly. We have found changes in postsynaptic AMPA receptor sensitivity in neurons of the chick cochlear nucleus, the nucleus magnocellularis (nMAG), by photolysis of caged glutamate immediately after activation of a single synaptic input. Additionally, synaptic desensitization was demonstrated via competition between synaptically released glutamate and an exogenous nondesensitizing agonist, kainate. Both approaches indicated that at least 35-40% of the receptors were desensitized after a single synaptic stimulus. Miniature synaptic currents were depressed after an evoked synaptic current, indicating that desensitization led to a reduction in the response to individual transmitter quanta. Stimulation of adjacent glutamatergic inputs to the same cell demonstrated that nearby terminals did not depress one another, suggesting that the desensitizing level of glutamate is restricted to each axon terminal. These findings confirm that postsynaptic neurons may use desensitization to regulate the strength of transmission on a synapse-specific basis.
Key words: glutamate receptors; kainate; AMPA; desensitization; synaptic transmission; voltage clamp; caged compounds; auditory; brain slice
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