Aberrant seizure-induced neurogenesis in experimental temporal lobe epilepsy

Jack M. Parent, Robert C. Elliott, Samuel J. Pleasure, Nicholas M. Barbaro, Daniel H. Lowenstein

Research output: Contribution to journalArticle

260 Scopus citations

Abstract

Neurogenesis in the hippocampal dentate gyrus persists throughout life and is increased by seizures. The dentate granule cell (DGC) layer is often abnormal in human and experimental temporal lobe epilepsy, with dispersion of the layer and the appearance of ectopic granule neurons in the hilus. We tested the hypothesis that these abnormalities result from aberrant DGC neurogenesis after seizure-induced injury. Bromodeoxyuridine labeling, in situ hybridization, and immunohistochemistry were used to identify proliferating progenitors and mature DGCs in the adult rat pilocarpine temporal lobe epilepsy model. We also examined dentate gyri from epileptic human hippocampal surgical specimens. Prox-1 immunohistochemistry and pulse-chase bromodeoxyuridine labeling showed that progenitors migrate aberrantly to the hilus and molecular layer after prolonged seizures and differentiate into ectopic DGCs in rat. Neuroblast marker expression indicated the delayed appearance of chainlike progenitor cell formations extending into the hilus and molecular layer, suggesting that seizures alter migratory behavior of DGC precursors. Ectopic putative DGCs also were found in the hilus and molecular layer of epileptic human dentate gyrus. These findings indicate that seizure-induced abnormalities of neuroblast migration lead to abnormal integration of newborn DGCs in the epileptic adult hippocampus, and implicate aberrant neurogenesis in the development or progression of recurrent seizures.

Original languageEnglish (US)
Pages (from-to)81-91
Number of pages11
JournalAnnals of neurology
Volume59
Issue number1
DOIs
StatePublished - Jan 2006

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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    Parent, J. M., Elliott, R. C., Pleasure, S. J., Barbaro, N. M., & Lowenstein, D. H. (2006). Aberrant seizure-induced neurogenesis in experimental temporal lobe epilepsy. Annals of neurology, 59(1), 81-91. https://doi.org/10.1002/ana.20699