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Ouabain Induced Seizures: Site of Production and Response to Anticonvulsants

Published online by Cambridge University Press:  18 September 2015

Duncan L.W. Davidson ,
Yasuo Tsukada  and
André Barbeau
Yasuo Tsukada
Affiliation:
Department of Neurobiology, Clinical Research Institute of Montreal
André Barbeau*
Affiliation:
Department of Neurobiology, Clinical Research Institute of Montreal
*
Clinical Research Institute of Montreal, 110 Pine Avenue West, Montreal, Quebec, Canada.
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Ouabain, an inhibitor of Na+-K+-ATP'ase, has been administered intraventricularly to rats to study the effect of impairment of membrane transport mechanisms on the genesis of seizures. Running and leaping seizures occur rapidly after injection oj ouabain in a low volume (10μl) when the maximal uptake of ouabain (39.8%) is in the hippocampus. Generalized clonic-lonic seizures are induced by higher volume injections (50μl) associated with wider distribution of ouabain, including the cerebellum and brainstem.

Ouabain was injected into cerebral cortex, caudate nucleus, dorsal hippocampus, fastigeal nucleus, ventrolateral mesencephalic reticular formation and cerebellar cortex. The cerebellar injections produced both running and leaping and generalized clonic-lonic seizures. It is suggested that this results from decreased inhibitory effect of vermal and paravermal Purkinje cells on intra-cerebellar nuclei, which alters cerebellar influence on the reticular formation and the limbic system.

Diphenylhydantoin, phenobarbitone, phenacemide, carbamezepine and clonazepam but not ethosuximide are effective against generalized clonic-lonic seizures, suggesting that this is a model for “grand mat” but not “petit mal” seizure mechanisms. It is furthermore suggested that running and leaping are subcortical, probably limbic, seizures that are most relevant as a model for temporal lobe seizures.

Type
Research Article
Information
Canadian Journal of Neurological Sciences , Volume 5 , Issue 4 , November 1978 , pp. 405 - 411
Copyright
Copyright © Canadian Neurological Sciences Federation 1978

References

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