Bidirectional modulation of hippocampal long-term potentiation under stress and no-stress conditions in basolateral amygdala-lesioned and intact rats

Volker Korz, Julietta U. Frey

Research output: Contribution to journalArticle

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Abstract

Hippocampal long-term potentiation (LTP) is widely considered as a cellular model for learning and memory formation. We have shown previously that protein synthesis-independent, early dentate gyrus (DG) LTP, lasting ∼4-5 h, can be transformed into a late-LTP with a duration of ≥24 h by a brief acute swim stress experience (high-stress condition). This reinforcement requires the activation of mineralocorticoid receptors and protein synthesis. The basolateral amygdala (BLA) is known to modulate glucocorticoid effects on the consolidation of spatial/contextual memory via a β-adrenergic mechanism. Interestingly, hippocampal DG-LTP can also be indirectly modulated by β-adrenergic and cholinergic/muscarinergic processes. Here, we show that the reinforcement of early-DG-LTP under high-stress conditions depends on the processing of novel spatial/contextual information. Furthermore, this reinforcement was blocked in BLA-lesioned animals compared with sham-operated and intact controls; however, it was not dependent on β-adrenergic or cholinergic/muscarinergic receptor activation. In contrast, under low-stress conditions, the induction of late-LTP in BLA-lesioned animals is facilitated, and this facilitation, again, was dependent on β-adrenergic activation. The data suggest that DG-LTP maintenance can be influenced by the BLA through different mechanisms: a short-lasting corticosterone-dependent and β-adrenergic-independent mechanism and a long-lasting mechanism that facilitated hippocampal β-adrenergic mechanisms.

Original languageEnglish (US)
Pages (from-to)7393-7400
Number of pages8
JournalJournal of Neuroscience
Volume25
Issue number32
DOIs
Publication statusPublished - Aug 10 2005

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Keywords

  • Basolateral amygdala
  • Early-LTP
  • Late-LTP
  • Locus ceruleus
  • Memory
  • Stress

ASJC Scopus subject areas

  • Neuroscience(all)

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