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The amino acid proline has long been suspected to serve as a modulator of synaptic transmission in the mammalian brain, but no such function has been identified. The selective expression of high affinity proline transport by a subset of glutamate pathways suggested that proline might play a role in synaptic transmission at these sites. This idea was tested with use of one such pathway, the Schaffer...
This study utilized a grease-gap preparation to investigate the effects of polyamines on responses of CA1 hippocampal pyramidal cells to N-methyl-d-aspartate (NMDA) and on the block of the NMDA channel by Mg 2+ . In the absence of added Mg 2+ , 1,10-diaminodecane (0.1-1 mM) non-competitively antagonized NMDA-evoked depolarizations. Its antagonism slowly progressed to a stable...
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