Viral risk factor for seizures: pathobiology of dynorphin in herpes simplex viral (HSV-1) seizures in an animal model.
Neurobiol Dis
; 23(3): 612-20, 2006 Sep.
Article
en En
| MEDLINE
| ID: mdl-16843674
ABSTRACT
Up to 89% of patients with herpes simplex virus type-1 (HSV-1) encephalitis can have seizures. Possibly, viruses are environmental triggers for seizures in genetically vulnerable individuals. Inherited dynorphin promoter polymorphisms are associated with temporal lobe epilepsy and febrile seizures in man. In animals, the dynorphin system in the hippocampus regulates excitability. The hypothesis that reduced dynorphin expression in dentate gyrus of hippocampus due to HSV-1 infection leads to epileptic responses was tested in a rat model of HSV-1 encephalitis using EEG recording, histopathological and neuropharmacologic probes. HSV-1 infection causes loss of dynorphin A-like immunoreactivity in hippocampus, an effect independent of direct viral interference and cell loss. A kappa opioid receptor agonist U50488 effectively blocks ictal activity, linking absence of dynorphin to propensity for epileptic activity. These findings show a vulnerability of hippocampal dynorphin during infection, suggesting a neurochemical basis for seizures that may be generalizable to other encephalitic viruses.
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Colección:
01-internacional
Base de datos:
MEDLINE
Contexto en salud:
4_TD
Problema de salud:
4_meningitis
Asunto principal:
Dinorfinas
/
Herpesvirus Humano 1
/
Predisposición Genética a la Enfermedad
/
Encefalitis por Herpes Simple
/
Epilepsia
Tipo de estudio:
Etiology_studies
/
Prognostic_studies
/
Risk_factors_studies
Límite:
Animals
Idioma:
En
Revista:
Neurobiol Dis
Asunto de la revista:
NEUROLOGIA
Año:
2006
Tipo del documento:
Article
País de afiliación:
Estados Unidos