Benzodiazepine receptor increases after repeated seizures: evidence for localization to dentate granule cells.
AUTOR(ES)
Valdes, F
RESUMO
Repeated seizures, whether induced by kindling or electroshock, result in increased numbers of benzodiazepine receptors in hippocampal formation membranes. We sought to determine the cellular constituents containing the receptor increases. Binding studies of microdissected samples localized the receptor increases to fascia dentata. [3H]Flunitrazepam autoradiographic studies showed increases of silver grain density over the granule cell and molecular layers of fascia dentata but not in other regions of hippocampal formation. Destruction of granule cells by colchicine or neonatal x-irradiation was associated with marked decrease of benzodiazepine receptor binding. Together, these results provide evidence for localization of the receptor increases to the somata and dendritic tree of the granule cells. We suggest that this cellular localization may provide a clue to the network of altered neural circuitry underlying amygdala kindling.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=345689Documentos Relacionados
- Potassium currents in acutely isolated human hippocampal dentate granule cells.
- Epilepsy after first seizures: risks and implications.
- Repeated seizures induce long-term increase in hippocampal benzodiazepine receptors.
- Amnesic syndrome after theophylline associated seizures: iatrogenic brain injury.
- Excitatory Dentate Granule Cells Normally Contain GAD and GABA, but Does That Make Them GABAergic, and Do Seizures Shift Granule Cell Function in the Inhibitory Direction?
