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Different mossy fiber sprouting patterns in ILAE hippocampal sclerosis types.

Barbara Schmeiser1, Jinmei Li2, Armin Brandt3

  • 1Department of Neurosurgery, University Medical Center, Albert-Ludwigs-University, Breisacher Strasse 64, 79106 Freiburg im Breisgau, Germany.

Epilepsy Research
|August 21, 2017
PubMed
Summary

Hippocampal sclerosis (HS) subtypes were analyzed for granule cell dispersion (GCD) and mossy fiber sprouting (MFS). Findings suggest GCD and MFS may occur independently of neuronal cell loss in temporal lobe epilepsy (TLE).

Keywords:
Granule cell dispersionHippocampal sclerosisILAEMossy cellsSeizure outcome

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Area of Science:

  • Neurology
  • Pathology
  • Epilepsy Research

Background:

  • Hippocampal sclerosis (HS) is the primary pathology in temporal lobe epilepsy (TLE), marked by neuronal cell loss and axonal reorganization like granule cell dispersion (GCD) and mossy fiber sprouting (MFS).
  • The International League Against Epilepsy (ILAE) classification defines HS subtypes based on distinct patterns of neuronal cell loss within the cornu ammonis (CA) regions.
  • Traditionally, MFS was thought to result from the loss of mossy fiber target cells in CA3 and CA4.

Purpose of the Study:

  • To investigate the relationship between ILAE HS subtypes and the presence of GCD and MFS.
  • To determine if clinico-pathological subgroups within HS can be corroborated through these associations.
  • To explore potential independent development of GCD and MFS in TLE.

Main Methods:

  • Analysis of 319 hippocampal specimens, with 214 suitable for detailed study.
  • Immunohistochemical staining for neuronal cell loss (NeuN) and MFS (synaptoporin).
  • Review of presurgical data and classification of postsurgical seizure outcomes using the Engel score.

Main Results:

  • 18% of cases showed no HS, GCD, or MFS.
  • 72% exhibited typical HS (ILAE HS 1) with severe cell loss in CA1-4, accompanied by extensive GCD and MFS.
  • ILAE HS 2 and 3 subtypes also demonstrated GCD and MFS, irrespective of their specific cell loss patterns. Longer epilepsy duration and younger age at surgery correlated with ILAE HS 2.

Conclusions:

  • Granule cell dispersion (GCD) and mossy fiber sprouting (MFS) may develop independently of the neuronal cell loss in mossy fiber target cells.
  • The study supports the existence of distinct clinico-pathological subgroups within hippocampal sclerosis.
  • Further research is warranted to elucidate the precise mechanisms driving GCD and MFS in TLE.