Frequency potentiation in granule cells in vivo at theta frequency perforant path stimulation.

Abstract:

:The effect of frequency potentiation on the postsynaptic potential in granule cells was studied stimulating the perforant path in curarized and urethanized rats. At stimulation frequencies between 2.0-5.0 Hz, synaptic efficacy in eliciting an orthodromic action potential increased despite the hyperpolarization of the transmembrane potential. The excitatory postsynaptic potential (EPSP) slope and duration also increased while the inhibitory postsynaptic potential (IPSP) was reduced. Stimulation frequencies greater than 5.0 Hz produced similar changes in the transmembrane potential and EPSP-IPSP sequence, but they did not increase synaptic efficacy. The frequency potentiation at frequencies into the theta band suggest that this potentiation participates in theta rhythm genesis in this structure which, in turn, suggests that the fascia dentata could work as a band-pass filter. In 12.5% of cases postpotentiation was also observed.

journal_name

Exp Neurol

journal_title

Experimental neurology

authors

Muñoz MD,Núñez A,García-Austt E

doi

10.1016/0014-4886(91)90148-6

subject

Has Abstract

pub_date

1991-07-01 00:00:00

pages

74-8

issue

1

eissn

0014-4886

issn

1090-2430

pii

0014-4886(91)90148-6

journal_volume

113

pub_type

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