Participation of muscarinic receptors in memory consolidation in passive avoidance learning

• Autorzy: Dobryakova Y.V. , Gurskaya O. , Markevich V. A.
• Języki publikacji: EN

Abstrakty

EN

It is well-known that the cholinergic system and the muscarinic cholinergic receptors are associated with cognitive functions. Here we examined whether a non-selective muscarinic receptor antagonist scopolamine affects learning performance and/or synaptic plasticity during the memory consolidation period. Adult male Wistar rats (250-300 g) were injected with scopolamine (2 mg/kg) or saline immediately after training in a "passive avoidance" task. Memory retention test was conducted 24h after training. The changes in the latency of the first entry into a dark compartment of a test chamber was choosen as a criterion of learning. The efficacy of synaptic transmission was estimated by the changes in the basal level of focal potentials (fEPSP amplitude and slope ratio) before training (baseline), 90 min after the training (consolidation period), and 24 hour after the training (retention period). We found that foot-shock presentation by itself had no effect on fEPSP within the first 90 min after training, but in 24 hour fEPSPs were decreased. In untrained rats administration of scopolamine had no effect on the fEPSP amplitude within the first 90 min after the injection, but in 24 h we observed an increase in the fEPSP amplitude. In trained animals, scopolamine decreased the fEPSP amplitude in the hippocampal CA1 area during first 1.5 h after the injection. However, the drug had no effect on the memory retention in the passive avoidance task. Taken together our data suggest that scopolamine modifies the synaptic placticity of the hippocampal network but does not induce significant changes in the retention of the passive avoidance skill.

• Wydawca: -
• Czasopismo: Acta Neurobiologiae Experimentalis
• Rocznik: 2014
• Tom: 74
• Numer: 2
• Opis fizyczny: p.211-217,fig.,ref.

Twórcy

autor

Dobryakova Y.V.

• Neurophysiology of Learning Lab, Institute for Higher Nervous Activity and Neurophysiology Russian Academy of Science, Moscow, Russia

autor

Gurskaya O.

• Neurophysiology of Learning Lab, Institute for Higher Nervous Activity and Neurophysiology Russian Academy of Science, Moscow, Russia

autor

Markevich V. A.

• Neurophysiology of Learning Lab, Institute for Higher Nervous Activity and Neurophysiology Russian Academy of Science, Moscow, Russia

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