Deep brain stimulation of the mediodorsal thalamic nucleus yields increases in the expression of zif-268 but not c-fos in the frontal cortex

Samuel G Ewing, Bernd Porr, Judith A Pratt

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This study explores the regions activated by deep brain stimulation of the mediodorsal thalamic nucleus through examination of immediate early genes as markers of neuronal activation. Stimulation was delivered unilaterally with constant current 100 μs duration pulses at a frequency of 130 Hz delivered at an amplitude of 200 μA for 3h. Brains were removed, sectioned and radio-labelled for the IEGs zif-268 and c-fos. In anaesthetised rats, deep brain stimulation of mediodorsal thalamic nucleus produced robust increases in the expression of zif-268 but not c-fos localised to regions that are reciprocally connected with the mediodorsal thalamic nucleus, including the prelimbic and orbitofrontal cortices, and the premotor cortex indicating an increase in synaptic activity in these regions. These findings map those brain regions that are persistently, rather than transiently, activated by high frequency electrical stimulation of the mediodorsal thalamic nucleus by a putatively antidromic mechanism which may be relevant to neuropsychiatric disorders such as schizophrenia in which thalamocortical systems are disrupted and in which DBS protocols are being considered.

Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalJournal of Chemical Neuroanatomy
Volume52
Early online date6 May 2013
DOIs
Publication statusPublished - Sep 2013

Keywords

  • animals
  • deep brain stimulation
  • early growth response protein 1
  • frontal lobe
  • genes, fos
  • male
  • mediodorsal thalamic nucleus
  • neural pathways
  • rats

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