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Anti-Hebbian Long-Term Potentiation in the Hippocampal Feedback Inhibitory Circuit
Karri P. Lamsa,1
Joost H. Heeroma,1
Peter Somogyi,2
Dmitri A. Rusakov,1
Dimitri M. Kullmann1*
Abstract:
Long-term potentiation (LTP), which approximates Hebb's postulateof associative learning, typically requires depolarization-dependentglutamate receptors of the NMDA (N-methyl-D-aspartate) subtype.However, in some neurons, LTP depends instead on calcium-permeableAMPA-type receptors. This is paradoxical because intracellularpolyamines block such receptors during depolarization. We reportthat LTP at synapses on hippocampal interneurons mediating feedbackinhibition is "anti-Hebbian":Itis induced by presynaptic activitybut prevented by postsynaptic depolarization. Anti-Hebbian LTPmay occur in interneurons that are silent during periods ofintense pyramidal cell firing, such as sharp waves, and leadto their altered activation during theta activity.
1 Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK. 2 Anatomical Neuropharmacology Unit, Medical Research Council, Oxford University, Mansfield Road, Oxford OXI 3HT, UK.
* To whom correspondence should be addressed. E-mail: d.kullmann{at}ion.ucl.ac.uk
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