Spontaneous epileptic seizures in transgenic rats harboring a human ADNFLE missense mutation in the β2-subunit of the nicotinic acetylcholine receptor.

Abstract:

:We generated a transgenic rat strain with a missense mutation in V286L (V286L-TG), in the gene encoding the neuronal nicotinic acetylcholine receptor β2 subunit (CHRNB2) found in patients with autosomal dominant nocturnal frontal lobe epilepsy (ADNFLE). To confirm that V286L-TG rats exhibit seizures similar to those observed in humans, gene expression patterns and behavioral phenotypes were analyzed. In situ hybridization using a V286L Chrnb2-selective probe indicated that the transgene was expressed at higher levels in the cortex, hippocampus, and cerebellum of V286L-TG than wild-type littermates (non-TG). Spontaneous epileptic seizures with ictal discharges in electroencephalograms were detected in 45% of V286L-TG rats and the frequency of seizures was 0.73 times a week. This seizure type is similar to "paroxysmal arousals" that are observed in human ADNFLE. V286L-TG rats displayed nicotine-induced abnormal motor activity including seizures in comparison to non-TGs. Response time following nicotine administration occurred faster in V286L-TG than in non-TG rats. V286L-TG rats demonstrated spontaneous epileptic seizures, which are similar to human ADNFLE, and also showed a higher sensitivity to nicotine administration. Thus, the V286L-TG rat model could be a valuable tool for developing novel mechanism-driven treatment strategies for epilepsy and provide a better understanding of ADNFLE.

journal_name

Neurosci Res

journal_title

Neuroscience research

authors

Shiba Y,Mori F,Yamada J,Migita K,Nikaido Y,Wakabayashi K,Kaneko S,Okada M,Hirose S,Ueno S

doi

10.1016/j.neures.2015.06.003

subject

Has Abstract

pub_date

2015-11-01 00:00:00

pages

46-54

eissn

0168-0102

issn

1872-8111

pii

S0168-0102(15)00160-1

journal_volume

100

pub_type

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