[3H]-flunitrazepam-labeled benzodiazepine binding sites in the hippocampal formation in autism: a multiple concentration autoradiographic study.

Journal Article

Increasing evidence indicates that the GABAergic system in cerebellar and limbic structures is affected in autism. We extended our previous study that found reduced [(3)H]flunitrazepam-labeled benzodiazepine sites in the autistic hippocampus to determine whether this reduction was due to a decrease in binding site number (B (max)) or altered affinity (K (d)) to bind to the ligand. Quantitation of hippocampal lamina demonstrated a 20% reduction in B (max) indicating a trend toward a decreased number of benzodiazepine binding sites in the autistic group but normal K (d) values. A reduction in the number of hippocampal benzodiazepine binding sites suggests alterations in the modulation of GABA(A) receptors in the presence of GABA in the autistic brain, possibly resulting in altered inhibitory functioning of hippocampal circuitry.

Full Text

Duke Authors

Cited Authors

  • Guptill, JT; Booker, AB; Gibbs, TT; Kemper, TL; Bauman, ML; Blatt, GJ

Published Date

  • May 2007

Published In

Volume / Issue

  • 37 / 5

Start / End Page

  • 911 - 920

PubMed ID

  • 17019626

Pubmed Central ID

  • 17019626

International Standard Serial Number (ISSN)

  • 0162-3257

Digital Object Identifier (DOI)

  • 10.1007/s10803-006-0226-7


  • eng

Conference Location

  • United States