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Decreased calmodulin kinase activity after status epilepticus
J Bronstein1, D Farber, C Wasterlain
1Department of Neuroscience, UCLA School of Medicine 90024.
Neurochemical Research
|January 1, 1988
Summary
Status epilepticus significantly reduced calmodulin kinase II activity in rat brain synaptic membranes. This finding in cortical and hippocampal tissues suggests altered neuronal excitability during seizures.
Area of Science:
- Neuroscience
- Biochemistry
- Epilepsy Research
Background:
- Status epilepticus (SE) is a neurological emergency characterized by prolonged seizures.
- Calmodulin kinase II (CaMKII) is a crucial enzyme involved in neuronal plasticity and excitability.
- Understanding CaMKII's role during seizures is vital for developing targeted therapies.
Purpose of the Study:
- To investigate the impact of status epilepticus on calmodulin kinase II activity in specific rat brain regions.
- To determine if changes in CaMKII activity correlate with seizure intensity or duration.
Main Methods:
- Status epilepticus was induced in rats using bicuculline.
- Calmodulin kinase II activity was measured in vitro in cerebral cortex, hippocampus, and cerebellum.
- Assays utilized [gamma-32P]ATP and polyacrylamide gel electrophoresis.
Main Results:
- A 3.2-fold decrease in CaMKII activity was observed in cortical synaptic membranes.
- An 8.2-fold decrease in CaMKII activity was found in hippocampal synaptic membranes.
- No significant changes in CaMKII activity were detected in cerebellar membranes or cytosolic fractions.
Conclusions:
- Intense neuronal firing during status epilepticus reduces CaMKII activity in cortical and hippocampal synaptic membranes.
- These alterations in CaMKII activity may contribute to changes in neuronal excitability during seizures.
- Cerebellar CaMKII activity appears unaffected by status epilepticus in this model.