Abstract
Hippocampal long-term potentiation (LTP) is a long-lasting increase in synaptic efficacy considered to be the cellular basis of memory. LTP consists of an early, protein synthesis-independent phase (E-LTP) and a late phase that depends on protein synthesis (L-LTP). Application of a weak tetanus can induce E-LTP in the dentate gyrus (DG) which can be reinforced into L-LTP by direct stimulation of the basolateral amygdala (BLA) within 30. min before or after LTP induction (structural LTP-reinforcement, [1]). LTP can be depotentiated by low-frequency stimulation (LFS) to the same synaptic input if applied shortly after tetanization (<10. min). Here, we addressed the question of whether stimulation of the BLA is able to recover LTP at depotentiated synaptic inputs. We hypothesized that E-LTP can activate synaptic tags, which were then reset by depotentiation. Stimulation of the BLA thereafter could beneficially act on tag-reactivation as well as on the activation of the synthesis of plasticity-related proteins (PRPs), normally captured by the tags and thus transforming E-LTP into L-LTP. Our results show, that BLA-stimulation was not able to reactivate the resetting of tags by depotentiation in the DG of freely moving rats.
Original language | English (US) |
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Pages (from-to) | 549-553 |
Number of pages | 5 |
Journal | Physiology and Behavior |
Volume | 101 |
Issue number | 4 |
DOIs | |
State | Published - Nov 2010 |
Keywords
- BLA-stimulation
- Basolateral amygdala
- Dentate gyrus
- Depotentiation
- LTP
- LTP-reinforcement
- Long-term potentiation
ASJC Scopus subject areas
- Experimental and Cognitive Psychology
- Behavioral Neuroscience