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Down-regulation of RalBP1 expression reduces seizure threshold and synaptic inhibition in mice.

Abstract：

:Idiopathic epilepsy is characterized by seizures without a clear etiology and is believed to have a strong genetic component but exhibits a complex inheritance pattern. Genetic factors seem to confer a low seizure threshold to susceptible individuals and thereby enhance epileptogenesis. However, the identity of susceptibility genes and the mechanisms regulating seizure threshold are still poorly understood. Here, we describe that reduced expression of RalBP1, a downstream effector of the small GTPases RalA and RalB, lowers the seizure threshold in mice. The intraperitoneal injection of the chemoconvulsant pentylenetetrazol induced more severe seizures in RalBP1 hypomorphic mice than in their wild-type littermates. The reduction of RalBP1 in the brain has no effect on neuronal excitability, but does decrease the inhibitory synaptic transmission onto CA1 pyramidal neurons. This impaired synaptic inhibition was associated with the loss of GABAergic interneurons in the CA1 subfield of the hippocampus. The present study identifies RalBP1 as a gene regulating the seizure threshold in mice and provides direct evidence for the role of RalBP1 in synaptic inhibition in vivo.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Bae YS,Chung W,Han K,Park KY,Kim H,Kim E,Kim MH

doi

10.1016/j.bbrc.2013.02.056

subject

Has Abstract

pub_date

2013-04-05 00:00:00

pages

175-80

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(13)00316-1

journal_volume

433

pub_type

杂志文章

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