Resetting of 'synaptic tags' is time- and activity-dependent in rat hippocampal CA1in vitro

S. Sajikumar, J. U. Frey

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

We have recently proposed that the maintenance of hippocampal long-term potentiation (LTP) and depression depends on at least two required processes: induction of LTP must set (1) process-specific 'synaptic tags' which capture (2) process-unspecific plasticity-related proteins (PRPs), synthesized via a heterosynaptic interaction [Neurobiol Learn Mem 82 (2004) 12]. The 'tag' as well as the PRPs are characterized by a relatively short half-life of several minutes up to a few hours before they degrade most likely by processes such as dephosphorylation. The question now arose whether the 'tags' can also be reset in an activity-dependent manner, thus preventing the processing of PRPs with the result of transient short-lasting plasticity. Here we have investigated this topic during early-LTP and found that low-frequency stimulation shortly after early-LTP-induction (5 min) resets the 'tag' or the 'tag complex' of macromolecules preventing any lasting forms of LTP and thus, preventing the formation of a memory trace.

Original languageEnglish (US)
Pages (from-to)503-507
Number of pages5
JournalNeuroscience
Volume129
Issue number2
DOIs
StatePublished - Nov 1 2004

Keywords

  • depotentiation
  • early-LTP
  • functional plasticity
  • late-LTP
  • long-term potentiation
  • synaptic tagging

ASJC Scopus subject areas

  • Neuroscience(all)

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