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Journal of Neuroscience, Vol 7, 774-780, Copyright © 1987 by Society for Neuroscience
Long-term potentiation in the hippocampus using depolarizing current pulses as the conditioning stimulus to single volley synaptic potentials
B Gustafsson, H Wigstrom, WC Abraham and YY Huang
The conditions responsible for the associative properties of long-term
potentiation (LTP) were examined in the CA1 region of the hippocampal slice
preparation. Intracellularly recorded EPSPs resulting from single- volley
stimulation at low frequency (0.15-0.1 Hz) in the stratum radiatum or
oriens were paired with depolarizing current pulses (50-100 msec) injected
through the recording microelectrode. It is shown that these EPSPs, when
paired with pulses of sufficient magnitude, become potentiated. This
potentiation generally reached a peak after 20-30 pairing events and could
outlast the conditioning period by more than 1 hr. It was specific to the
paired input, was blocked by 2-amino-5- phosphonovalerate (APV) and was
largely blocked by prior homosynaptic tetanization (and vice versa). In
experiments performed with picrotoxin (PTX) in the bath, EPSPs were
potentiated using 2-4 nA current pulses, with somewhat higher values in
normal solution. The effective current pulses, in both normal and PTX
solution, produced a repetitive spike discharge of 7-11 spikes (per 100
msec), and within this range, higher frequencies were associated with
larger potentiations. However, since similar degrees of EPSP potentiation
were observed following blockade of spike activity by intracellular QX-314,
spike activity was not the primary conditioning factor. For the
potentiation to appear, the EPSP had to occur together with the current
pulse or precede it by less than about 100 msec. No potentiation was
observed when the EPSP immediately succeeded the pulse. The results suggest
that the cooperativity aspect of LTP is related to a need for sufficient
postsynaptic depolarization.(ABSTRACT TRUNCATED AT 250 WORDS)
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