Behavioral and biochemical effects of early postnatal cholinergic lesion in the hippocampus

Erzsébet Gáspár, Martin Heeringa, Éva Markel, Paul G.M. Luiten, Csaba Nyakas

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

The effects of early postnatal (PD 8) intracerebroventricular injection of ethylcholine mustard aziridinium ion (AF64A) on development of open-field and cognitive behaviors and cholinergic markers in several brain areas were examined in the rat. The cholinotoxin was bilaterally administered in a dose range of 0.25 to 2.0 nmol. In the open-field tests, the cholinergic lesion caused a dose-dependent increase in activity at 20 days of age, while it resulted in lengthened latency to initiate exploration and decreased rearing activity at adulthood. Hole-board spatial learning was severely inhibited in adult age. The biochemical activity of choline acetyltransferase (ChAT) and acetylcholinesterase (AChE) in the hippocampus was markedly decreased in a dose-dependent manner, but was unchanged in the neocortex and striatum. Histochemical staining of AChE-positive fibers revealed a severe cholinergic denervation of the granular and pyramidal cell layers of the hippocampus. The results showed that a selective cholinergic deafferentation of the hippocampus at a critical stage of development leads to long-lasting abnormal open-field and spatial learning behaviors.

Original languageEnglish
Pages (from-to)65-71
Number of pages7
JournalBrain Research Bulletin
Volume28
Issue number1
DOIs
Publication statusPublished - Jan 1992

Keywords

  • AF64A
  • Cholinergic markers
  • Development
  • Hippocampus
  • Open-field activity
  • Spatial learning

ASJC Scopus subject areas

  • Neuroscience(all)

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