Abstract:
:Temporal lobe epilepsy (TLE) is accompanied by an abnormal location of granule cells in the dentate gyrus. Using a rat model of complex febrile seizures, which are thought to be a precipitating insult of TLE later in life, we report that aberrant migration of neonatal-generated granule cells results in granule cell ectopia that persists into adulthood. Febrile seizures induced an upregulation of GABA(A) receptors (GABA(A)-Rs) in neonatally generated granule cells, and hyperactivation of excitatory GABA(A)-Rs caused a reversal in the direction of granule cell migration. This abnormal migration was prevented by RNAi-mediated knockdown of the Na(+)K(+)2Cl(-) co-transporter (NKCC1), which regulates the excitatory action of GABA. NKCC1 inhibition with bumetanide after febrile seizures rescued the granule cell ectopia, susceptibility to limbic seizures and development of epilepsy. Thus, this work identifies a previously unknown pathogenic role of excitatory GABA(A)-R signaling and highlights NKCC1 as a potential therapeutic target for preventing granule cell ectopia and the development of epilepsy after febrile seizures.
journal_name
Nat Medjournal_title
Nature medicineauthors
Koyama R,Tao K,Sasaki T,Ichikawa J,Miyamoto D,Muramatsu R,Matsuki N,Ikegaya Ydoi
10.1038/nm.2850subject
Has Abstractpub_date
2012-08-01 00:00:00pages
1271-8issue
8eissn
1078-8956issn
1546-170Xpii
nm.2850journal_volume
18pub_type
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