Anticonvulsant activity of intracerebroventricularly administered glial GABA uptake inhibitors and other GABAmimetics in chemical seizure models

Susan F. Gonsalves, Bonnie Twitchell, Robert Harbaugh, Povl Krogsgaard-Larsen, Arne Schousboe

Research output: Contribution to journalArticle

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Abstract

The antiseizure activities of glial or neuronal GABA uptake inhibitors and GABA agonists were compared following intracerebroventricular administration in 2 acute models of chemoconvulsion in rats. The glia-selective GABA uptake inhibitor, 4,5,6,7-tetrahydroisoxazolo[4,5-c]pyridin-3-ol (THPO), given at doses of 100-750 μg, i.c.v., protected against maximal pentylenetetrazol (PTZ) seizures and increased the latency to isonicotinic acid hydrazide (INH) seizures for at least 1 h following central administration. THPO failed to increase PTZ seizure thresholds. In contrast, the more potent partly glia-selective GABA uptake inhibitor, cis-4-hydroxynipecotic acid (30-300 μg), which is also a substrate for neuronal and glial transport systems, protected only 33% of rats against PTZ-induced tonic extension and had no effect on INH seizure latency. The neuron-selective uptake inhibitor l-2,4-diaminobutyric acid (DABA) at 1500 μg exhibited anti-PTZ activity initially and then, after a delay, produced proconvulsant behavior and spontaneous myoclonus in some animals. Intracerebroventricular injection of the GABA receptor agonist, muscimol, at toxic doses, gave rise to mixed anticonvulsant (INH seizures) and proconvulsant (PTZ seizure thresholds) effects. The results suggest that THPO, of the 4 compounds tested, possesses significant anticonvulsant activity. Its ability to suppress tonic but not generalized minor seizures suggests that it may block seizure spread.

Original languageEnglish (US)
Pages (from-to)34-41
Number of pages8
JournalEpilepsy Research
Volume4
Issue number1
DOIs
StatePublished - Jan 1 1989

Fingerprint

GABA Uptake Inhibitors
Chemical Models
Neuroglia
Anticonvulsants
Seizures
Pentylenetetrazole
Isoniazid
GABA Agonists
Muscimol
Myoclonus
Aptitude
Poisons
Neurons

All Science Journal Classification (ASJC) codes

  • Neurology
  • Clinical Neurology

Cite this

Gonsalves, Susan F. ; Twitchell, Bonnie ; Harbaugh, Robert ; Krogsgaard-Larsen, Povl ; Schousboe, Arne. / Anticonvulsant activity of intracerebroventricularly administered glial GABA uptake inhibitors and other GABAmimetics in chemical seizure models. In: Epilepsy Research. 1989 ; Vol. 4, No. 1. pp. 34-41.
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abstract = "The antiseizure activities of glial or neuronal GABA uptake inhibitors and GABA agonists were compared following intracerebroventricular administration in 2 acute models of chemoconvulsion in rats. The glia-selective GABA uptake inhibitor, 4,5,6,7-tetrahydroisoxazolo[4,5-c]pyridin-3-ol (THPO), given at doses of 100-750 μg, i.c.v., protected against maximal pentylenetetrazol (PTZ) seizures and increased the latency to isonicotinic acid hydrazide (INH) seizures for at least 1 h following central administration. THPO failed to increase PTZ seizure thresholds. In contrast, the more potent partly glia-selective GABA uptake inhibitor, cis-4-hydroxynipecotic acid (30-300 μg), which is also a substrate for neuronal and glial transport systems, protected only 33{\%} of rats against PTZ-induced tonic extension and had no effect on INH seizure latency. The neuron-selective uptake inhibitor l-2,4-diaminobutyric acid (DABA) at 1500 μg exhibited anti-PTZ activity initially and then, after a delay, produced proconvulsant behavior and spontaneous myoclonus in some animals. Intracerebroventricular injection of the GABA receptor agonist, muscimol, at toxic doses, gave rise to mixed anticonvulsant (INH seizures) and proconvulsant (PTZ seizure thresholds) effects. The results suggest that THPO, of the 4 compounds tested, possesses significant anticonvulsant activity. Its ability to suppress tonic but not generalized minor seizures suggests that it may block seizure spread.",
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Anticonvulsant activity of intracerebroventricularly administered glial GABA uptake inhibitors and other GABAmimetics in chemical seizure models. / Gonsalves, Susan F.; Twitchell, Bonnie; Harbaugh, Robert; Krogsgaard-Larsen, Povl; Schousboe, Arne.

In: Epilepsy Research, Vol. 4, No. 1, 01.01.1989, p. 34-41.

Research output: Contribution to journalArticle

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