Abstract
The present study has examined the anticonvulsant and neuroprotective effect of (S)-3,4-dicarboxyphenylglycine ((S)-3,4-DCPG), a highly selective agonist for subtype 8 of group III metabotropic glutamate receptors (mGluRs), against seizures induced in immature 12-day-old rats by bilateral icv infusion of DL-homocysteic acid (DL-HCA, 600 nmol/side). For biochemical analyses, rat pups were sacrificed during generalized clonic-tonic seizures, approximately 45-50 min after infusion. Comparable time intervals were used for sacrificing the animals which had received (S)-3,4-DCPG (0.25 nmol/each side, 15-20 min prior to infusion of DL-HCA or saline). This agonist provided a pronounced anticonvulsant effect, generalized clonic-tonic seizures were completely suppressed and cortical energy metabolite changes which normally accompany these seizures were either normalized (decrease of glucose and glycogen) or markedly reduced (an accumulation of lactate). Anticonvulsant effect of (S)-3,4-DCPG was also evident from the EEG recordings, nevertheless, it was not complete. In spite of the absence of obvious motor phenomena, sporadic ictal activity could be seen in some animals. Isolated spikes could also be observed in some animals after admini...Continue Reading
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