Light and Electron Microscopic Examinations in the Hippocampus of the Rat Brain Following PTZ-Induced Epileptic Seizures

Abstract

The aim of this work was to evaluate hippocampal neurons in the rat brain after single and repetetive seizures induced by
pentyleneterazol (PTZ) administration at light- and electron-microscopically. Acute- and chronic-PTZ groups of male Wistar
albino rats were given PTZ intraperitoneal injection (i.p.), and the age-matched rats in control group were injected with normal
saline. We determined contributions of apoptosis and necrosis to neuronal damage in Nissl-stained- and ultrathin-sections. Necrotic
neurons were observed in PTZ-treated groups, especially in the chronic-PTZ group. Histological changes were perikaryal swelling,
chromatolysis and decreasing of Nissl in the necrotic neurons. Necrotic and apoptotic neurons of the hippocampus were observed
ultrastructurally in the PTZ groups. These findings demonstrated a significant decrease in the number of hippocampal neurons in
the chronic-PTZ group. It is clear that in the hippocampal regions repeated PTZ-induced seizures of the rats cause neuronal damage
and neuronal loss.