Authors' present addresses D. Debanne: Unité de Neurocybernétique Cellulaire, UPR9041 CNRS, 280 Boulevard Sainte-Marguerite, 13009 Marseille, France. Email: debanne@LNFZ.CNRS-MRS.FR
Long-term synaptic plasticity between pairs of individual CA3 pyramidal cells in rat hippocampal slice cultures
Article first published online: 22 SEP 2004
The Journal of Physiology
Volume 507, Issue 1, pages 237–247, February 1998
How to Cite
Debanne, D., Gähwiler, B. H. and Thompson, S. M. (1998), Long-term synaptic plasticity between pairs of individual CA3 pyramidal cells in rat hippocampal slice cultures. The Journal of Physiology, 507: 237–247. doi: 10.1111/j.1469-7793.1998.237bu.x
S. M. Thompson: Department of Physiology, University of Maryland at Baltimore, 655 West Baltimore Street, Baltimore, MD 21201, USA. Email: email@example.com
- Issue published online: 22 SEP 2004
- Article first published online: 22 SEP 2004
- (Received 18 March 1997; accepted after revision 14 October 1997)
- 1Long-term potentiation (LTP) and depression (LTD) were investigated at synapses formed by pairs of monosynaptically connected CA3 pyramidal cells in rat hippocampal slice cultures.
- 2An N-methyl-D-aspartate (NMDA) receptor-mediated component of the unitary EPSP, elicited at the resting membrane potential in response to single action potentials in an individual CA3 cell, could be isolated pharmacologically.
- 3Associative LTP was induced when single presynaptic action potentials were repeatedly paired with 240 ms postsynaptic depolarizing pulses that evoked five to twelve action potentials or with single postsynaptic action potentials evoked near the peak of the unitary EPSP. LTP induction was prevented by an NMDA receptor antagonist.
- 4Associative LTD was induced when single presynaptic action potentials were repeatedly elicited with a certain delay after either 240 ms postsynaptic depolarizing pulses or single postsynaptic action potentials. The time window within which presynaptic activity had to occur for LTD induction was dependent on the amount of postsynaptic depolarization. LTD was induced if single pre- and postsynaptic action potentials occurred synchronously.
- 5Homosynaptic LTD was induced by 3 Hz tetanization of the presynaptic neuron for 3 min and was blocked by an NMDA receptor antagonist.
- 6Depotentiation was produced with stimulation protocols that elicit either homosynaptic or associative LTD.
- 7Recurrent excitatory synapses between CA3 cells display associative potentiation and depression. The sign of the change in synaptic strength is a function of the relative timing of pre- and postsynaptic action potentials.