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Long‐term depression and long‐term potentiation in horizontal connections of the barrel cortex
Author(s) -
Urban Joanna,
Kossut Malgorzata,
Hess Grzegorz
Publication year - 2002
Publication title -
european journal of neuroscience
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.346
H-Index - 206
eISSN - 1460-9568
pISSN - 0953-816X
DOI - 10.1046/j.1460-9568.2002.02225.x
Subject(s) - long term potentiation , long term depression , nmda receptor , barrel (horology) , barrel cortex , stimulation , neuroscience , synaptic plasticity , chemistry , antagonist , biophysics , receptor , biology , materials science , ampa receptor , biochemistry , composite material
Synaptic plasticity of horizontally orientated connections between barrels, in the barrel cortex of adult mice, was studied in slice preparations cut across rows of barrels. Field potentials were evoked in the middle of one barrel column (in layer IV or V) and recorded in the neighbouring barrel (in layer IV and V). In layer IV, long‐term depression (LTD) by 26.5 ± 5% was first induced by a low‐frequency stimulation (2 Hz) applied for 10 min. After 30 min, theta‐burst stimulation was delivered to previously depressed connections, resulting in long‐term potentiation (LTP) by 28.8 ± 11.8%. When theta‐burst stimulation was delivered without an earlier low‐frequency stimulation, no LTP was induced. Similar results were obtained in layer V connections (LTD: 40.6 ± 12.5%; LTP: 26.9 ± 12.5%). In layer IV, the application of 100 µ m d , l ‐2‐amino‐5‐phosphonovaleric acid (APV), an antagonist of NMDA receptors, blocked the induction of both LTD and LTP. These experiments show that a potential for synaptic plasticity is retained in granular and infragranular layers of adult mice.