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The Journal of Neuroscience, June 1, 1999, 19(11):4314-4324
A Role of Actin Filament in Synaptic Transmission and
Long-Term Potentiation
Chong-Hyun
Kim and
John E.
Lisman
Department of Neuroscience and Volen Center for Complex Systems,
Brandeis University, Waltham, Massachusetts 02454
The role of actin filaments in synaptic function has been
studied in the CA1 region of the rat hippocampal slice. Bath
application (2 hr) of the actin polymerization inhibitor latrunculin B
did not substantially affect the shape of dendrites or spines. However, this and other drugs that affect actin did affect synaptic function. Bath-applied latrunculin B reduced the synaptic response. Several lines
of evidence indicate that a component of this effect is presynaptic. To
specifically test for a postsynaptic role for actin, latrunculin B or
phalloidin, an actin filament stabilizer, was perfused into the
postsynaptic neuron. The magnitude of long-term potentiation
(LTP) was decreased at times when baseline transmission was not
yet affected. Longer applications produced a decrease in baseline AMPA
receptor (AMPAR)-mediated transmission. The magnitude of the
NMDA receptor-mediated transmission was unaffected, indicating a
specific effect on the AMPAR. These results suggest that postsynaptic actin filaments are involved in a dynamic process required to maintain
AMPAR-mediated transmission and to enhance it during LTP.
Key words:
actin filament; latrunculin B; cytochalasin D; phalloidin; LTP; CA1; hippocampus; AMPAR; NMDAR
Copyright © 1999 Society for Neuroscience 0270-6474/99/19114314-11$05.00/0
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