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Changes in [Ca2+]0, [K+]0 and neuronal activity during oenanthotoxin-induced epilepsy in cat sensorimotor cortex
Electroencephalography and Clinical Neurophysiology
|November 1, 1983
Summary
Oenanthotoxin (OETX), a convulsant drug, triggers epileptiform activity in cat sensorimotor cortex by altering neuronal discharges and ion concentrations. This suggests calcium-dependent mechanisms initiate seizure-like events.
Area of Science:
- Neuroscience
- Neuropharmacology
- Epilepsy Research
Background:
- Oenanthotoxin (OETX) is a convulsant agent with known effects on neuronal excitability.
- Understanding the mechanisms of OETX-induced seizures is crucial for epilepsy research.
Purpose of the Study:
- To investigate the effects of OETX on neuronal activity and extracellular ion concentrations in the feline sensorimotor cortex.
- To elucidate the role of calcium (Ca2+) and potassium (K+) in OETX-induced epileptiform discharges.
Main Methods:
- Topical application of OETX to the sensorimotor cortex of cats.
- Recording of field potentials and neuronal discharges.
- Measurement of extracellular free Ca2+ and K+ concentrations ([Ca2+]0 and [K+]0).
Main Results:
- OETX application induced spike activity and later spontaneous seizures.
- Seizures were associated with significant increases in [K+]0 and decreases in [Ca2+]0.
- Decay in [Ca2+]0 often preceded seizure onset, suggesting a role in initiation.
Conclusions:
- OETX induces epileptiform activity and seizures in the feline cortex.
- OETX-induced seizures involve substantial alterations in extracellular ion homeostasis.
- Calcium-dependent mechanisms are implicated in the initiation of OETX-induced epileptiform activity, similar to other epileptogenic drugs.