Cytogenesis in the dentate gyrus after neonatal hyperthermia-induced seizures: what becomes of surviving cells?
Epilepsia
; 49(5): 853-60, 2008 May.
Article
em En
| MEDLINE
| ID: mdl-18076639
ABSTRACT
PURPOSE:
Febrile seizures (FS) are early-life seizures thought to play a role in epileptogenesis. By labeling cells that were dividing immediately following experimental FS, we previously demonstrated that significantly more of these newborn cells in the dentate gyrus (DG) survived 8 weeks later, relative to animals that did not experience FS. The purpose of the present study was to determine the long-term fate of these newborn cells.METHODS:
On postnatal day (PN) 10, hyperthermia-induced seizures (HT, +/-42 degrees C core temperature) were evoked in Sprague-Dawley rats and littermates were used as normothermia controls (NT, +/-35 degrees C core temperature). From PN11 to PN16, rats were injected with bromodeoxyuridine (BrdU) to label dividing cells. At PN66, we evaluated the number of BrdU-labeled cells in the DG that colocalized with the neuronal marker NeuN, glial marker glial fibrillary acidic protein (GFAP), neuronal excitatory amino acid transporter 3 (EAAT3), GABAergic neuronal marker glutamic acid decarboxylase 67 (GAD67) or microglia marker tomato lectin (TL).RESULTS:
In all rats, almost all BrdU-labeled cells in the DG, that showed double-labeling, colocalized with NeuN, and rarely with GFAP, GAD67, or TL. In NT controls and HT rats that did not experience seizures ("HT-no seizures"), approximately 23% of BrdU-labeled cells colocalized with EAAT3, which was significantly different from 14% in HT rats that did experience seizures (HT + FS).DISCUSSION:
Early-life seizures decrease the population of newborn cells that survive and mature into EAAT3-positive neurons and do not affect the GABAergic cell population. This may affect hippocampal physiology in young adulthood.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Sobrevivência Celular
/
Giro Denteado
/
Convulsões Febris
/
Proliferação de Células
/
Febre
Limite:
Animals
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article