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Granule cell dispersion develops without neurogenesis and does not fully depend on astroglial cell generation in a mouse model of temporal lobe epilepsy

Purpose:  Granule cell dispersion (GCD) appears as a characteristic morphological feature of the mesial temporal lobe epilepsy (MTLE). It has been suggested that this phenomenon could be due to an increased neurogenesis in the dentate gyrus. However, this hypothesis is still debated and recent clinical and experimental studies have shown that neurogenesis is rather decreased in MTLE. To further determine the role of neural and astroglial cell generation in GCD we examined the consequences of aging and irradiation, which are known to reduce progenitor cells, in a mouse model of MTLE induced by intrahippocampal kainate (KA) injection.