Temporal lobe central benzodiazepine binding in unilateral mesial temporal lobe epilepsy.

Abstract:

:PET-demonstrated decreases in [11C]flumazenil binding occur in anterior mesial temporal structures on the side of epileptogenesis in unilateral mesial temporal lobe epilepsy. We performed quantitative autoradiography on anterior mesial and lateral temporal specimens from 11 subjects with unilateral mesial temporal lobe epilepsy and six neurologically normal controls to identify the predominant in vitro correlates of the decreased [11C]flumazenil binding. In anterior mesial temporal regions exhibiting the greatest neuronal cell loss, decreases in agonist and antagonist binding to type 1 and 2 (central) benzodiazepine binding sites were highly correlated with neuronal cell counts. Cell loss and decreased binding were particularly prominent in the lateral portion of hippocampal region CA1, adjacent to CA2. Lateral temporal central benzodiazepine binding was diffusely increased, achieving statistical significance in cortical laminae V and VI. These findings suggest that the predominant source of PET-demonstrated decreases in [11C]flumazenil binding in mesial temporal epilepsy is hippocampal sclerosis, rather than down-regulation of central benzodiazepine binding sites on surviving hippocampal neurons.

journal_name

Neurology

journal_title

Neurology

authors

Burdette DE,Sakurai SY,Henry TR,Ross DA,Pennell PB,Frey KA,Sackellares JC,Albin RL

doi

10.1212/wnl.45.5.934

subject

Has Abstract

pub_date

1995-05-01 00:00:00

pages

934-41

issue

5

eissn

0028-3878

issn

1526-632X

journal_volume

45

pub_type

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