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pubmed-article:7751964pubmed:abstractTextTo determine whether AMPA receptor channel desensitization has a physiological role in shaping network activity by modulating signal transmission through excitatory circuits, we examined the effects of cyclothiazide (CYT), the most potent known blocker of AMPA receptor desensitization, on the behavior of an endogenously active neural system in vitro, the brainstem network generating rhythmic respiratory oscillations in neonatal rat medullary slices. Bath application of 100 microM CYT significantly increased the frequency of endogenously generated rhythm and increased the amplitude of the circuit output [i.e., discharge of hypoglossal (XII) respiratory motoneurons]. Local application of CYT within the XII motor nucleus produced a concentration-dependent increase (up to 35%) in amplitude of the motoneuron population discharge as well as an increase in the peak current (23%) and total charge transfer of the rhythmic inspiratory synaptic drive (33%) to individual XII motoneurons. CYT also acted postsynaptically to increase the amplitude of spontaneous EPSCs in motoneurons. In addition, CYT produced a profound, long-term augmentation of network frequency and motor output that may be secondary to block of desensitization. These results suggest that AMPA receptor desensitization has functionally significant effects on the temporal behavior and output of the rhythmic, respiratory neural network, and, by extrapolation, on other integrative actions of the mammalian CNS.lld:pubmed
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pubmed-article:7751964pubmed:articleTitleModulation of neural network activity in vitro by cyclothiazide, a drug that blocks desensitization of AMPA receptors.lld:pubmed
pubmed-article:7751964pubmed:affiliationDepartment of Physiological Science, University of California at Los Angeles 90095-1527, USA.lld:pubmed
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