Electrical and pharmacological manipulations of the nucleus accumbens core impair synaptic plasticity in the dentate gyrus of the rat

J. Kudolo, H. Tabassum, Sabine Martina Frey, J. López, H. Hassan, Julietta Uta Frey, J. A. Bergado

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The interest on the physiology of the nucleus accumbens (NAcc) has grown in recent years given its relationship to addictive behaviours, and the possibility to treat them by interacting with NAcc function. We have shown that the prior stimulation of the core region blocks induction of long-term potentiation (LTP) at the dentate gyrus in anaesthetized rats, while the shell facilitated it. In the present study we have confirmed and expanded those results testing the effects of core and shell stimulation in freely moving rats, as well as the effect of blocking D1 receptors in the NAcc. Our results show that shell stimulation had no effect on baseline recordings of the field excitatory postsynaptic potential (fEPSP) or the population spike amplitude (PSA) for 24 h. Core stimulation did not modify baseline-fEPSP, but significantly depressed PSA up to 8 h. LTP maintenance was not modified; neither by core nor shell stimulation after its induction, but LTP induction was impaired (both in the fEPSP and PSA) by core stimulation 15 min before induction. Shell stimulation showed a slight facilitating effect. Previous, topical application of a dopaminergic-receptor antagonist (SCH23390) into the NAcc produced a significantly depressed baseline fEPSP and PSA, as well as LTP measured in both components of the evoked potentials. Our results confirm a dual role of stimulation of NAcc sub-regions on hippocampal baseline synaptic transmission, and LTP induction when activated before induction. In contrast, stimulation of the NAcc had no influence on an already ongoing dentate gyrus LTP. A role for dopaminergic innervation to the NAcc, modifying susceptibility for synaptic plasticity outside the NAcc is also suggested by our results.

Original languageEnglish (US)
Pages (from-to)723-731
Number of pages9
JournalNeuroscience
Volume168
Issue number3
DOIs
StatePublished - Jul 1 2010

Fingerprint

Neuronal Plasticity
Dentate Gyrus
Nucleus Accumbens
Long-Term Potentiation
Pharmacology
Excitatory Postsynaptic Potentials
Population
Addictive Behavior
Dopamine Antagonists
Evoked Potentials
Synaptic Transmission
Maintenance

Keywords

  • Accumbens
  • Core
  • Dopamine receptors
  • Shell
  • Synaptic plasticity

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Electrical and pharmacological manipulations of the nucleus accumbens core impair synaptic plasticity in the dentate gyrus of the rat. / Kudolo, J.; Tabassum, H.; Frey, Sabine Martina; López, J.; Hassan, H.; Frey, Julietta Uta; Bergado, J. A.

In: Neuroscience, Vol. 168, No. 3, 01.07.2010, p. 723-731.

Research output: Contribution to journalArticle

Kudolo, J. ; Tabassum, H. ; Frey, Sabine Martina ; López, J. ; Hassan, H. ; Frey, Julietta Uta ; Bergado, J. A. / Electrical and pharmacological manipulations of the nucleus accumbens core impair synaptic plasticity in the dentate gyrus of the rat. In: Neuroscience. 2010 ; Vol. 168, No. 3. pp. 723-731.
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