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Cellular prion protein: implications in seizures and epilepsy
Roger Walz1, Rosa Maria R P S Castro, Tonicarlo R Velasco
1CIREP, Center for Epilepsy Surgery, Ribeirão Preto School of Medicine, University Hospital, University of São Paulo, Ribeirão Preto, SP, Brazil.
Cellular and Molecular Neurobiology
|December 10, 2002
Summary
Cellular prion protein (PrPc) loss in mice increases seizure susceptibility and neuronal excitability. This suggests PrPc plays a crucial role in preventing epilepsy by regulating neuronal function and oxidative stress.
Area of Science:
- Neuroscience
- Cellular Biology
- Neurochemistry
Background:
- Cellular prion protein (PrPc) is a cell membrane protein vital for central nervous system functions like copper uptake, oxidative stress defense, and neuronal survival.
- PrPc's role in neurological disorders, particularly epilepsy, remains incompletely understood.
Purpose of the Study:
- To investigate the functional consequences of PrPc deletion on neuronal excitability and seizure susceptibility in mice.
- To elucidate the specific mechanisms by which PrPc deficiency contributes to hyperexcitability in the brain.
Main Methods:
- Utilized Prnp knockout mice to study the effects of PrPc gene deletion.
- Performed in vivo and in vitro electrophysiological recordings to assess neuronal excitability.
- Analyzed changes in ion channel function, neurotransmission, and oxidative stress markers in the hippocampus and neocortex.
Main Results:
- Prnp knockout mice exhibited enhanced sensitivity to seizures and increased neuronal excitability.
- Observed disrupted Ca(+2)-activated K+ currents, altered GABA-A inhibition, and mossy fiber reorganization in the hippocampus.
- Detected changes in ectonucleotidases and elevated oxidative stress in both hippocampus and neocortex.
- Noted a reduction in afterhyperpolarization potentials in hippocampal CA1 cells of knockout mice.
Conclusions:
- Loss of PrPc function significantly contributes to hyperexcitable and synchronized neuronal activity, underlying seizure generation.
- These findings highlight PrPc's critical role in maintaining neuronal homeostasis and preventing epilepsy.
- Further investigation into PrPc's involvement in human epileptic syndromes is warranted.