Abstract:
:High-frequency stimulation of excitatory synapses in many regions of the brain triggers a lasting increase in the efficacy of synaptic transmission referred to as long-term potentiation (LTP) and believed to contribute to learning and memory. One hypothesis proposed to account for the stability and properties of this functional plasticity is a structural remodeling of spine synapses. This possibility has recently received support from several studies. It has been found that spines are highly dynamic structures, that they can be formed very rapidly, and that synaptic activity and calcium modulate changes in spine shape and formation of new spines. Ultrastructural analyses bring additional support to these observations and suggest that LTP is associated with a remodeling of the postsynaptic density (PSD) and a process of spine duplication. This new information is reviewed and interpreted in light of other recent advances concerning the mechanisms of LTP and especially the role of postsynaptic glutamate receptor turnover in this form of plasticity. Taken together, a view is emerging that suggests that morphologic changes of spine synapses are associated with LTP and that they not only correlate with, but probably also contribute to the increase in synaptic transmission.
journal_name
Hippocampusjournal_title
Hippocampusauthors
Muller D,Toni N,Buchs PAdoi
10.1002/1098-1063(2000)10:5<596::AID-HIPO10>3.0.COkeywords:
subject
Has Abstractpub_date
2000-01-01 00:00:00pages
596-604issue
5eissn
1050-9631issn
1098-1063journal_volume
10pub_type
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