To examine the occurrence of neuron activation,neurodegeneraion and cell death,and the correlation among them in the hippocampus after status epilepticus.Methods CFV,Fluoro Jade B and c-Fos staining were done at multiple time points after pilocarpine induced status epilepticus.Results In the stratum granulosum of dentate gyrus,c-Fos positive neurons increased significantly at 1 h,2 h and 1 d after status epilepticus (P ＜0.01 or 0.05).However,almost no Fluoro Jade B staining cell was found in the stratum granulosum in the experiment and control groups,and no obvious difference was shown on the numbers of CFV staining cells in this area among all groups.In the hilus of dentate gyrus of different groups,there were no c-Fos positive neurons in all groups.In the hilus,the number of Fluoro Jade B staining cells significantly increased at 2 h and 1 d after the status epilepticus (P ＜0.01 ),and the number of CFV staining neurons dramatically decreased 1 d after the status epilepticus ( P ＜ 0.01 ) compared with the control.In the stratum pyramidale of CA1,the numbers of c-Fos positive neurons at 30 mim,1 h,2 h and 1 d,and Fluoro Jade B staining cells at 2 h and 1 d after the status epilepticus significantly increased (P ＜ 0.01 or 0.05 ),while no obvious difference in the number of CFV staining cells in the stratum pyramidale of CA1 among different groups was shown.Conclusion There is no direct correlation among cell activation,neuron degeneration and cell death in the hippocampus of mice after pilocarpine induced status epilepticus.

OBJECTIVE: To analyze the survival and the changes of proportions of Calbindin, Calretinin and Parvalbumin positive neurons in mouse hippocampal CA area at chronic stage of Pilocarpine-induced epilepsy. METHODS: Calbindin, Calretinin and Parvalbumin immunofluoresence staining were done 2 months after Pilocarpine-induced epilepsy in mice or saline injection. RESULTS: Two months after Pilocarine-induced epilepsy, the number of Calbindin, Calretinin and Parvalbumin positive neurons in the CA area decreased significantly compared with the control (P<0.01), especially the Calbindin positive neurons had a great drop and Pavalbumin positive neurons had a least drop. At the chronic stage of epilepsy, the proportion of Calbindin, Calretinin and Parvalbumin positive neurons in the CA area was changed. The content of Pavalbumin positive neurons increased whereas the content of Calbindin positive neurons decreased significantly compared with the control (P<0.01). CONCLUSION The changes of proportions of Calbindin, Calretinin and Parvalbumin positive neurons in the CA area of mouse hippocampus may be a factor in the ongoing epileptic activity at chronic stage of Pilocarpine-induced epilepsy.
Animals ; Calbindin 2 ; metabolism ; Calbindins ; metabolism ; Cell Survival ; physiology ; Chronic Disease ; Epilepsy ; chemically induced ; metabolism ; Hippocampus ; metabolism ; Male ; Mice ; Neurons ; metabolism ; Parvalbumins ; metabolism ; Pilocarpine ; gamma-Aminobutyric Acid ; metabolism