| Literature DB >> 16899258 |
Wade Morishita1, Wei Lu, Gordon B Smith, Roger A Nicoll, Mark F Bear, Robert C Malenka.
Abstract
The triggering of both NMDA receptor-dependent long-term potentiation (LTP) and long-term depression (LTD) in the CA1 region of the hippocampus requires a rise in postsynaptic calcium. A prominent hypothesis has been that the detailed properties of this postsynaptic calcium signal dictate whether LTP or LTD is generated by a given pattern of synaptic activity. Recently, however, evidence has been presented that the subunit composition of the NMDA receptor (NMDAR) determines whether a synapse undergoes LTP or LTD with NR2A-containing NMDARs triggering LTP and NR2B-containing NMDARs triggering LTD. In the present study, the role of NR2B-containing synaptic NMDARs in the induction of LTD in CA1 pyramidal cells has been studied using the selective NR2B antagonists, ifenprodil and Ro25-6981. While both antagonists reduced NMDAR-mediated synaptic currents, neither prevented induction of LTD. These results demonstrate that activation of NR2B-containing NMDARs is not an absolute requirement for the induction of LTD in the hippocampus.Entities:
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Year: 2006 PMID： 16899258 DOI： 10.1016/j.neuropharm.2006.07.005
Source DB: PubMed Journal: Neuropharmacology ISSN： 0028-3908 Impact factor: 5.250