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Seizure-induced neuronal necrosis: implications for programmed cell death mechanisms
D G Fujikawa1, S S Shinmei, B Cai
1Neurology Department, Sepulveda Ambulatory Care Center, VA Greater Los Angeles Healthcare System, California 91343, USA. dfujikaw@ucla.edu
Epilepsia
|September 22, 2000
Summary
Neuronal death in status epilepticus (SE) models is necrotic, not apoptotic, despite DNA fragmentation markers. These findings suggest programmed cell death mechanisms may contribute to SE-induced neuronal necrosis.
Area of Science:
- Neuroscience
- Cell Biology
- Pathology
Background:
- Status epilepticus (SE) is a neurological emergency characterized by prolonged seizures.
- The precise mechanisms of neuronal death during SE, particularly the role of apoptosis versus necrosis, remain incompletely understood.
- Glutamate excitotoxicity, mediated by N-methyl-D-aspartate receptors, is implicated in SE-induced neuronal damage.
Purpose of the Study:
- To definitively characterize the morphology of neuronal death following lithium-pilocarpine (LPC) and kainic acid (KA)-induced SE.
- To correlate observed neuronal death with markers of DNA fragmentation, such as DNA laddering and TUNEL staining.
- To elucidate the contribution of programmed cell death pathways to SE-induced neuronal necrosis.
Main Methods:
- Adult male Wistar rats were subjected to 3 hours of SE induced by either LPC or KA.
- Brain sections were analyzed 24 and 72 hours post-SE using light and electron microscopy, hematoxylin and eosin staining, and the TUNEL technique.
- DNA was extracted from brain regions and analyzed for internucleosomal DNA cleavage (DNA laddering) via agarose gel electrophoresis.
Main Results:
- Neuronal death in multiple brain regions (hippocampus, amygdala, cortices) was morphologically necrotic 24 and 72 hours after LPC- or KA-induced SE.
- Despite necrotic morphology, DNA laddering was observed in these regions post-SE.
- TUNEL staining, a marker for DNA fragmentation, was positive in some regions 72 hours after SE.
Conclusions:
- SE activates programmed cell death-promoting mechanisms in neurons.
- Neurons undergoing death in SE models exhibit necrotic morphology rather than classical apoptosis.
- These activated mechanisms may play a significant role in the pathogenesis of SE-induced neuronal necrosis.
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