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Calcium, neuronal hyperexcitability and ischemic injury
1Department of Neurosurgery, Mayo Clinic, Rochester 55905.
Brain Research. Brain Research Reviews
|July 1, 1989
Summary
Calcium ions (Ca2+) are crucial for neuron function, controlling excitability and neurotransmitter release. Dysregulation of Ca2+ may drive seizures, suggesting Ca2+ channel blockers as potential epilepsy treatments.
Area of Science:
- Neuroscience
- Cellular Biology
- Biochemistry
Background:
- Neurons maintain a steep Ca2+ gradient (10,000-fold) between intracellular and extracellular environments.
- Ca2+ influx occurs via voltage-dependent and receptor-operated channels, with rapid restoration by Ca2+-ATPase, Na+/Ca2+ exchange, and ER sequestration.
- Ca2+ is vital for neurotransmitter release and neuronal excitability, independent of synaptic function.
Purpose of the Study:
- To analyze neuronal Ca2+ flux control mechanisms.
- To review evidence linking Ca2+ to seizure phenomena.
- To propose a theory on Ca2+ 's role in hyperexcitability and ischemic cell death.
Main Methods:
- Literature review of Ca2+ flux mechanisms in neurons.
- Analysis of studies on Ca2+ and seizure activity.
- Development of an integrative theoretical model.
Main Results:
- Ca2+ influx significantly impacts neuronal excitability beyond synaptic transmission.
- Abnormal Ca2+ metabolism is implicated in seizure initiation and propagation.
- Ca2+ channel blockers show therapeutic potential for epilepsy.
Conclusions:
- Understanding neuronal Ca2+ regulation is key to neurological disorders.
- Ca2+ dysregulation contributes to hyperexcitability and neuronal death.
- Targeting Ca2+ channels offers a novel therapeutic strategy for epilepsy.