Kindled seizure-induced reduction of muscarinic cholinergic receptors in rat hippocampal formation: evidence for localization to dentate granule cells.

Published

Journal Article

The binding of [3H] quinuclidinyl benzilate ( [3H] QNB) to muscarinic cholinergic receptors in dentate gyrus of rat hippocampal formation was analyzed by membrane binding assay and in vitro autoradiography. The destruction of dentate granule cells, either by neonatal irradiation or colchicine injection, resulted in nearly complete elimination of [3H] QNB binding sites in the molecular and granule cell layers. By contrast, neither perforant path transection nor destruction of the septal-hippocampal cholinergic afferents caused a decline of [3H] QNB binding sites. Amygdala kindled seizures resulted in a 30% reduction of [3H] QNB binding sites which was distributed uniformly across the entire molecular and granule cell layers. Thus, most, if not all, of the muscarinic cholinergic receptors present in dentate gyrus appear to reside on the somata and dendritic trees of the dentate granule cells. We propose that this kindled seizure-induced decline of muscarinic receptors represents an endogenous compensatory mechanism designed to stabilize granule cell excitability.

Full Text

Duke Authors

Cited Authors

  • Savage, DD; Dasheiff, RM; McNamara, JO

Published Date

  • November 20, 1983

Published In

Volume / Issue

  • 221 / 1

Start / End Page

  • 106 - 112

PubMed ID

  • 6643742

Pubmed Central ID

  • 6643742

International Standard Serial Number (ISSN)

  • 0021-9967

Digital Object Identifier (DOI)

  • 10.1002/cne.902210109

Language

  • eng

Conference Location

  • United States