Abstract:
:1. The present experiment was designed to test whether synaptic transmission and synaptic plasticity in the dentate gyrus were modulated by the medial amygdala (MeA). Field potentials in the dentate gyrus (DG) evoked by stimulations of the medial perforant path (PP) were extracellularly recorded in anesthetized rats. 2. Although single-pulse stimulation of the MeA augmented PP stimulation-evoked population spike amplitude in the DG transiently, high-frequency stimulation (100 Hz for 1 s) of the MeA induced long-lasting enhancement of synaptic transmission that was not occluded by PP tetanus-induced long-term potentiation (LTP). 3. When high-frequency stimulation of the MeA was applied concurrently with weak tetanus of the PP, which alone induced only marginal LTP, the magnitude of LTP increased considerably. 4. These results demonstrate that neuron activities in the MeA induce short- and long-lasting changes in the excitability of the PP-DG synapses and thereby enhance their synaptic plasticity.
journal_name
J Neurophysioljournal_title
Journal of neurophysiologyauthors
Ikegaya Y,Abe K,Saito H,Nishiyama Ndoi
10.1152/jn.1995.74.5.2201subject
Has Abstractpub_date
1995-11-01 00:00:00pages
2201-3issue
5eissn
0022-3077issn
1522-1598journal_volume
74pub_type
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