Interleukin-1β-induced memory reconsolidation impairment is mediated by a reduction in glutamate release and zif268 expression and α-melanocyte-stimulating hormone prevented these effects

Ivana Machado, Patricia V. Gonzalez, Alejandro Vilcaes, Lila Carniglia, Helgi B. Schiöth, Mercedes Lasaga, Teresa N. Scimonelli

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Interleukin 1β (IL-1β), a pro-inflammatory cytokine, significantly affects several cognitive processes. Previous studies by our group have demonstrated that intrahippocampal administration of IL-1β impairs reconsolidation of contextual fear memory. This effect was reversed by the melanocortin alpha-melanocyte-stimulating hormone (α-MSH). The mechanisms underlying the effect of IL-1β on memory reconsolidation have not yet been established. Therefore, we examined the effect of IL-1β on glutamate release, ERK phosphorylation and the activation of the transcription factor zinc finger- 268 (zif268) during reconsolidation. Our results demonstrated that IL-1β induced a significant decrease of glutamate release after reactivation of the fear memory and this effect was related to calcium concentration in hippocampal synaptosomes. IL-1β also reduced ERK phosphorylation and zif268 expression in the hippocampus. Central administration of α-MSH prevented the decrease in glutamate release, ERK phosphorylation and zif268 expression induced by IL-1β. Our results establish possible mechanisms involved in the detrimental effect of IL-1β on memory reconsolidation and also indicate that α-MSH may exert a beneficial modulatory role in preventing IL-1β effects.

Original languageEnglish (US)
Pages (from-to)137-146
Number of pages10
JournalBrain, Behavior, and Immunity
Volume46
DOIs
StatePublished - May 1 2015

Keywords

  • Alpha-melanocyte-stimulating hormone (α-MSH)
  • Ca<sup>2+</sup>
  • ERK
  • Glutamate release
  • Hippocampus
  • Interleukin-1β (IL-1β)
  • Memory reconsolidation
  • Zif268

ASJC Scopus subject areas

  • Immunology
  • Endocrine and Autonomic Systems
  • Behavioral Neuroscience

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