Selective decline of 5-HT(1A) receptor binding sites in rat cortex, hippocampus and cholinergic basal forebrain nuclei during aging

C. Nyakas, B. J. Oosterink, J. Keijser, K. Felszeghy, G. I. De Jong, J. Korf, P. G.M. Luiten

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Abstract

The effect of aging on 5-HT(1A) receptor binding in several forebrain areas associated with the basal forebrain cholinergic system was investigated in rats of 3-, 24- and 30-months-old by receptor autoradiography and biochemical binding assay using [3H]8-OH-DPAT as a ligand. Autoradiographic measurements demonstrated a marked region-specific decline of ligand binding in: (i) regions of the basal forebrain cholinergic cell groups, i.e. the medial septum, diagonal band nuclei and magnocellular nucleus basalis, (ii) the frontal and parietal neocortex and (iii) the dentate gyrus of the hippocampus. No change or only a slight decrease of the 5-HT(1A) receptor density was found in other areas investigated: the CA1 and CA3 sectors of hippocampus, the cingular and perirhinal cerebral cortex and the lateral septum. The autoradiographic findings were substantiated by the biochemical binding assay, which revealed a comparable loss of 5-HT(1A) receptor in the hippocampus and neocortex at the age of 30 months. The results clearly show that with increasing age the decrement of 5-HT(1A) receptor binding in the rat forebrain is remarkably region-selective and particularly affects the cholinergic cell groups that innervate cortex and hippocampus. This phenomenon appears to be especially significant in relation to the neuronal substrates underlying the age-related alterations of mood and cognition.

Original languageEnglish
Pages (from-to)53-61
Number of pages9
JournalJournal of chemical neuroanatomy
Volume13
Issue number1
DOIs
Publication statusPublished - Jun 1 1997

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Keywords

  • 5-HT(1A) receptor
  • Aging
  • Autoradiography
  • Binding assay
  • Rat forebrain

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience

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